2014 춘계 총회 및 학술대회 우수논문발표상 수상자
최우수논문상
2LF-13
Iron oxyhydroxide nanoneedle decoarated hybrid polypyrrole nanoparicles for chemical nerve Gas Agent Sensing
이준섭·장정식†
서울대학교 ([email protected]†)
Multidimensional FeOOH nanoneedle-decorated hybrid polypyrrole nanoparticles (PFFs) were fabricated using dual-nozzle electrospray and heat stirring process. To decorate metal oxide nanoneedles on the polypyrrole (PPy) surface, metal oxide particle-decorated PPys (E_PPy) were fabricated as starting materials. The E_PPy particles were prepared by dual-nozzle electrospray in the NaOH contained collector solution. Multidimensional hybrid PFFs were then formed by heat stirring reaction in the aqueous metal precursor contained solutions. These hybrid PPFs were applied to nerve gas agent (DMMP) chemical sensor at room temperature with excellent sensitivity.
The minimum detectable level (MDL) was as low as 0.1 ppb, which is higher than that for a chemical sensor based on hybrid materials.
Keywords: electrospray, chemical sensor, polypyrrole, DMMP gas
우수논문상-구두
2LF-1
Amine-stabilization of KOH on activated carbon surface in the preparation of a selective CO2 adsorbent Adelodun Adedeji Adebukola·조영민†
경희대학교 ([email protected]†)
In an effort to enhance the selective capture of CO2, heat treatment of 1 M KOH-doped activated carbon (AC) under inert (N2) and reducing (NH3) atmospheres was used. With N2 only, modified adsorbent became unstable to air upon retrieval. Therefore, stabilization by amination was employed, which also enabled further use of 2 and 4 M KOH doping. Amination-stabilized 4 M KOH-doped granular coal-based AC (N-4-G-CL) achieved the highest selectivity for CO2, as adsorption of 10% and 0.3% CO2 were significantly enhanced from 0.65 and 0.03 to 2.45 and 2.03 mmol/g respectively, with negligible reduction in the adsorption of pure CO2. Keywords: CO2 capture, KOH doping, amination, selective adsorption, surface stabilization
2LF-3
Superporous thermoresponsive MFC/PNIPAm composite hydrogels by unidirectional freezing Kantappa·이종휘†
중앙대학교 ([email protected]†)
The directional freezing is a simple technique for producing aligned porous structures. The crystalline microfibrilated cellulose (MFC), obtained by hydrolysis of bacterial cellulose used as reinforcing materials.
Superporous composite hydrogels were prepared by introducing MFC in cross-linked poly(N-isopropyl acrylamide) (PNIPAm). Herein unidirectional freezing and in-situ photopolymerization techniques were used.
The resulting materials have both aligned micropores and temperature responsive swelling. The immobilized of MFC reduced the swelling ratio and enhanced volume transition, whereas aligned micropores increased the swelling ratio and reduced the elastic modulus above the LCST transition. Aligned micropores facilitated the fast water infiltration confirmed by monitoring water contact angles with time which is beneficial for superabsorbent applications. This combination of MFC and micropores within PNIPAm could explore new route for the development of stimuli-responsive superporous hydrogels.
Keywords: hydrogel, PNIPAm, superporous
2LF-6
Preparation of highly reinforced pore-filling electrolyte membranes from cross-linked benzoxazine-benzimidazole copolymers for fuel cell applications
김기현·이종찬†·김성곤·고태윤
서울대학교 ([email protected]†)
pore-filling membranes have been developed for use in polymer electrolyte membrane fuel cell (PEMFC) at high temperature (> 100 ℃) and low relative humidity(<50%RH) operation. The pores of a porous substrate were filled with a polymer electrolyte, with the membrane stability being maintained by the substrate matrix.
Proton is transferred through the filling polymer electrolyte, and the porous substrate provides good physicochemical stability at high temperature. We developed pore-filling membranes that consisted of sulfonated poly(arylene ether sulfone)(PAES), a filling polymer electrolyte, and a porous poly(benzoxazine -co-benzimidazole) substrate. In comparison to a pristine PAES membrane, the pore-filling membrane showed improved dimensional stability, mechanical strength and cell performance.
Keywords: pore-filling membranes, PEMFC, PAES, porous poly(benzoxazine-co-benzimidazole) substrate
2LF-7
Effect of pH for development of PEI-modified biomass composite polysulfone fiber sorbent 김석·송명희·Wei Wei·윤영상†
전북대학교 ([email protected]†)
In this work, a novel concept for the development of a polysulfone (PS)-based fiber as a high-performance acid-tolerant adsorbent for the recovery of platinum group metals (PGMs) in acidic solution was outlined.
Polyethylenimine (PEI)-coated PS-Escherichia coli biomass composite fiber (PEI-PSBF) was prepared by spinning biomass-PS blends in water, coated with PEI and cross-linked with glutaraldehyde. The E. coli
biomass on the fiber was executed as a functional group donor for binding PEI. PS fiber (PSF), PS-biomass composite fiber (PSBF), and PEI-modified PSF (PEI-PSF) were also prepared and compared with PEI-PSBF.
The results of sorption experiments showed negligible sorption capacity of PSF and PEI-PSF. In contrast, the Pt(IV) uptake of PEI-PSBF was 6.6 times higher than that of PSBF. In addition, the maximum pH for preparation of PEI-PSBF was determined at around pH 9 and the reason for this is discussed.
Keywords: biosorption, surface modification, PEI, immobilization, biomass, polysulfone
2LF-9
Synthesis of graphene-based composites for environmental and energy applications 문건희*·최원용*,**,†
*포항공과대학교 화학공학과,**포항공과대학교 환경공학부 ([email protected]†)
The rapid injection of precursors of Ag, Au, and Pd immediately after UV lamp was turned off caused the formation of metal nanoaprticles on reduced graphene oxide (rGO) sheets since photoreduced phosphotungstates as well as electrons stored in rGO directly reduced metal ions. Visible light irradiation stimulated the structural change of GO itself, and this behaviour was utilized for the deposition of metal nanoparticles on GO.
The rGO hybridized with TiO2 was prepared as a low-cost alternative to Pt and a highly enhanced activity for the photocatalytic oxidation of As(III) was accomplished, which is comparable to that of Pt/TiO2. Also, TiO2 hybridized with rGO as a cocatalyst resulted in highly-enhanced photocatalytic generation of hydrogen peroxide even comparable to noble metals (Au, Ag, and Pt) loaded on TiO2 (M/TiO2). In the presence of phosphate, the formation of hydrogen peroxide significantly increased due to the stabilization of the TiO2 surface whose passivation layer effectively inhibited the decomposition of hydrogen peroxide.
Keywords: graphene, photocatalysis, metal nanoparticles, TiO2, composites
2LF-11
Synthesis of Ni/YSZ core-shell for SOFC anode by adding surfactant and Improved performance according to the structure
이민진*,**·최병현*,†·홍선기*·강영진*·황해진**·지미정*
*KICET,**Inha Univ.
SOFC 연료극이 균일한 미세구조를 갖게 하여 장기작동에 따른 열화를 방지하고 전기적 특성을 향상시키고자 Ni/YSZ core-shell구조를 갖는 분말을 합성하였다.
Ni/YSZ core-shell은 나노 크기의 구형 Ni을 합성하는 도중에 YSZ와 계면활성제를 첨가하여 합성하였다. 이때, 계면 활성제의 흡착력에 의해 Ni(200~500 nm)은 Core에, Ni의 1/5 수준인 100 nm 이하 크기의 YSZ는 shell에 위치하였 다. 보다 치밀한 구조의 Ni/YSZ core-shell은 YSZ powder보다 입자크기가 작은 YSZ sol상태일 때 가능하였다.
균일한 미세구조를 갖는 Ni/YSZ core-shell은 입자간의 균일 분포로 인하여 Ni/YSZ 복합체에 비해 수소선택성과 메 탄전환율이 최대 24.1%과 36.5% 향상된 특성을 확인하였다. 또한 800 ℃에서 전기전도도 3275 S/cm와 최대전력 밀 도 (Pmax) 850 W/cm2 그리고 ASR 0.26 Ω.cm2의 값으로 향상된 전기적 특성을 나타내었다.
Keywords: solid oxide fuel cell(sofc), anode, ni/ysz core-shell, surfactant, homogeneous microstructure
2LF-16
Facile synthesis of mesoporous iron oxide and carbide cubes by the thermal treatment of iron oxalate cubes
홍석용·박지찬·천동현†
한국에너지기술연구원 ([email protected]†)
Owing to defined morphology, high surface area and various application, iron oxide have received extensive attention. Their synthesis still focuses on either hard or soft template method. However, they are tedious, harmful, low stability and crystallinity. In this study, our synthesis method was newly developed to prepare metal oxalates by using both of saccharide and PVP, and then the metal oxide and carbide were prepared by thermal decomposition. This method could control its shape and change into phase such as oxide, carbide. Moreover, it was advantageous in low cost, environment friendliness, easy preparation.
Keywords: catalysis, metal oxalate, iron oxide, iron carbide
Excellent Paper Presentation Award
1SG-6
Fabrication of coaxial silicon nanoparticles-carbon nanotubes/carbon nanofibers for use in anodes of lithium ion batteries
NGUYEN TRUNG HIEU·박준서†·정옥희* 한경대학교,* 순천대학교
Coaxial electrospun silicon nanoparticles-carbon nanotubes/carbon nanofibers (SCNFs) were fabricated using electrospinning a blend of silicon nanoparticles (SiNPs), carbon nanotubes (CNTs), and poly vinylpyrrolidone (PVP) in the core and polyacrylonitrile (PAN) in the shell. After carbonization at 1000 ℃ for 2 h in nitrogen, the SCNFs were formed with carbon shell encapsulating SiNPs/CNTs core. SCNF electrode-based Li-ion batteries (LiBs) were prepared with different amount of CNTs (CNT/SiNP = 0.5, 1, 2, 5, 10 wt%). The coaxial structure and morphology of SCNFs were characterized. The charge-discharge voltage profile and cycling behavior of the LiBs were tested.
Keywords: lithium-ion battery, silicon nanoparticle, electrospinning, nanofiber
1SE-2
Selective reductive cleavage of inert aryl C-O bonds by a heterogeneous Bi-Metallic catalyst Ajay K Singh·Kyungrok Kim·Seugwook Jang·Dong Pyo Kim†
POSTECH ([email protected]†)
Selective Reductive Cleavage of Inert Aryl C-O Bonds of biomass and chemical feedstock’s from renewable resources (formic acid) is a promising potential source of clean chemicals and reduce the worlds dependence on crude-oil. With the help of dual functionalized catalyst, biomass and chemical feedstocks can be converted efficiently to produce valuable chemicals. Unfortunately, making the dual functionalized stable heterogeneous catalysts is more difficult to control on molecular level. Here, we describe the new route for synthesis of stable dual functionalized catalyst and catalytic reductive cleavage of inert aryl C-O bond a series of lignin derived
biomass and chemical feed stocks to provide valuable chemicals. Synthesized catalysts have been characterized by aberration-corrected scanning transmission electron microscopy (as well as other techniques), giving molecular level architecture and unique catalytic properties.
Keywords: bio-mass, lignin, formic acid, bimetallic catalyst, N-doped graphene oxide, fuel upgrading
우수논문상-포스터
[고분자]
1P-491
Reversible shape changing of multicompartmental microfibers
이재민·이경진†
충남대학교 ([email protected]†)
Materials in nature provide broad range of useful inspiration for preparing smart micro-building block. One of most interesting materials will be stimulus responsive polymers. Diverse range of examples has been reported about preparation of smart materials made of stimulus responsive polymers. In this study, we attempt to incorporate temperature responsive hydrogel into microbuilding block to produce multicompartmental microfibers in shape of core-shell structures by electrohydrodynamic co-jetting. Core-shell microfibers are jetted with parallel flow of solutions containing PNIPAM-co-PGMA in core and PLGA in shell. The water soluble PNIPAM-co-PGMA, is crosslinked with ethylenediamine during co-jetting. The core/shell microcylinders containing hydrogel in the cores shows reversible shape shifting by change of external environmental. The fibers are characterized by scanning electron microscope, confocal laser scanning microscope, and optical microscopy.
Keywords: multicompartmental microfiber, electrojetting
1P-492
Improved thermal conductivity of stretchable PVA/h-BN composites 권오환*,**·하성민*·고원건**·유영재*,†
*한국화학연구원,**연세대학교 ([email protected]†)
As an efficient heat releasing material from the inside of electric and electronic devices is getting important for both their drastic miniaturization and high performance, the use of polymers and polymer composites as thermally conductive materials is increasing for weight loss, low cost, facile processibility and high performance.
In this work, we demonstrate that enhanced thermal conductivity of polyvinyl alcohol (PVA) composites using hexagonal boron nitride (h-BN). For better dispersion without additional surface modification of h-BN, ultra-sonication with high intensity ultrasonic probe was used to prepare the hybrid solution. A custom-made film stretching apparatus was used to determine the stretching properties. Thermal conductivities of cast films and stretched films were determined using laser flash method.
Keywords: thermal conductivity, stretchable film, hexagonal boron nitride
1P-523
피렌 유도체를 이용한 Carbon nanotube 및 Carbon fiber 표면처리와 이를 이용한 나노카본-고분자 복합체 형성 김지영†·조민현
중앙대학교 ([email protected]†)
Carbon fiber(CF)는 고분자 복합체 내에서 충전재로써 기계적 물성 향상에 기여를 하며 Carbon nanotube(CNT)는 CF와 함께 이용 시 물성의 전반적인 향상에 기여를 한다. 본 연구에서는 복합체 제조 시에 일어나는 CF와 CNT 간의 분리 방지와, 화학적 처리로 인한 CF와 CNT의 구조적 손상의 최소화를 위해 피렌 유도체를 이용했다. CF와 multi-walled carbon nanotube (MWCNT)에 1-Aminopyrene (AP)과 1-pyrenebutyric chloride (PBC)를 물리흡착 을 이용해 CF에 amine group (CF-AP) 과 MWCNT에 acyl chloride group (MWCNT-PBC)을 도입 했다. 흡착된 피 렌 유도체의 작용기 간 반응을 통해 CF-MWCNT 제조 후 고분자와의 melt mixing을 통해 복합체를 형성했다. 물리 흡착 및 반응 여부는 FT-IR 및 XPS를 통해 분석하였으며 FE-SEM 및 TEM을 이용하여 CF 표면에 성장된 CNT 확 인 및 복합체 제조 후 CNT가 CF 표면에서 이탈되지 않고 정상적으로 결합 되어있는지를 확인했다.
Keywords: pyrene-derivatives, nanocarbon-polymer composite, carbon fiber
1P-486
Entrapped nanofibers within hydrogel microparticles for cell encapsulation Mallinath·이종휘†
중앙대학교 ([email protected]†)
Electrospun nanofiber based pH dependent microhydrogels were developed through a combination of normal electrospinning and spraying. In this study, we prepared the entrapped polystyrene (PS) nanofibers within sodium alginate (SA) microhydrogels through a combination of electrospinning and spraying and developed well defined microhydrogels with incorporated nanofibers. Optical microscopy revealed uniform surfaces and smooth structures (bead free) with SA microhydrogels entrapped PS nanofibers respectively. These physically sprayed SA microparticles were ionically crosslinked with aqueous calcium chloride. It concludes that 60 mins of ionic crosslink gives perfectly entrapped SA microhydrogels on the PS fibers. This work suggests one possible approach for drug release or cell encapsulation of such actives using microarchitectures. The combination of electrospinning and spraygun seems to be a useful technique for the preparation of microarchitectures and the combination of two nanomaterials.
Keywords: PS, sodium alginate, spraygun and electrospinning technique etc.
2P-443
Boronic acid and catechol conjugated polymer for having pH sensitive polymer with BODIPY use as cancer cell detection
이소영·신춘임·김성한·박수정·강은비·박성영†
한국교통대학교 ([email protected]†)
This paper is reports the development of pH responsive polymeric nanoplatforms having pH responsive boronate ester with reduced graphene oxide(rGO). The facile conjugation between BODIPY/Boronic acid conjugated PEG-g-poly(DMA-co-NIPAAm) and catechol conjugated poly(DMA-co-NIPAAm) with rGO was confirmed by 1H NMR, UV-vis and fluorescence spectroscopy. This nanoplatforms is confocal images of the
prepared nanoplatforms against MDA-MB 231 breast cancer cells confirm the intense green fluorescence at low and high pH values but no fluorescence signal under physiological pH condition enabling the nanoplatforms as a novel fluorescence probe. The nanoplatforms also revealed outstanding cell viability. Therefore, the developed nanoplatforms are novel candidate for a fluorescent probe to effectively detect tumor cells.
Keywords: BODIPY, boronic acid, catechol, ph sensitive, cell imaging
2P-472
Synthesis of poly(glycidyl azide-b-polystyrene) block copolymer via sequential ionic polymerization
김정수·이재명·김지은·권정옥·노시태†
한양대학교 ([email protected]†)
Using a plug flow reactor system for anionic functionalization and controlled batch reactor system for cationic ring opening polymerization, poly(glycidyl azide-b-styrene) block copolymer was synthesized. Anionic polymerization of styrene was carried at -25℃ followed by anionic functionalization of polystyrene with epibromohydrin at -78℃. And Epichlorohydrin (ECH) was polymerized by using BF3-tripropylene glycol (TPG) complex via Active monomer mechanism. After ECH polymerization was complete, ω-epoxy terminated PS (EpPS) was introduced to the PECH solution in presence of BF3. The resulting polymer had bimodal distribution when the mole ratio of [EpPS]/[TPG] was more than 0.5 due to the PS-PS coupling reaction.
Poly(glycidyl azide-b-styrene) (GAP-PS) was obtained by azidation reaction of PECH-PS with sodium azide.
Thermal behavior of the PECH-PS block copolymers and GAP-PS block copolymer were also investigated.
Keywords: anionic polymerization, cationic ring opening polymerization, plug flow reactor, glycidyl azide polymer
2P-512
선형 가교제를 이용한 폴리이미드 분리막의 가교 및 이에 따른 기체분리특성 평가
이혜림·남상용†
경상대학교 ([email protected]†)
기체분리막의 성능을 향상시키기 위한 여러 개질 방법 중 가교는 사슬 간격과 사슬 내 외부의 유동성을 감소시켜 분 리막의 선택도, 내화학성, 내가소성등을 증가시키는 장점을 지닌다. 본 연구에서는 선형의 지방족 가교제를 사용하여 폴리이미드 분리막의 기체 분리 성능을 향상시키고자 하였으며, 가교제의 알킬 길이에 따른 영향 또한 알아 보았다.
가교 여부는 이미드 그룹의 특성피크 증가와 아미드 그룹의 특성피크 감소를 통해 확인하였다. 가교 후 지방족 가교제 의 분해와 주쇄의 이미드 고리의 풀림으로 인해 가교 전 보다 열분해 온도는 감소 하였고 가교 결합 형성으로 인해 d-spacing값 또한 감소 하였다. 기체분리특성은 CH4, N2, O2, CO2 단일 기체에 대해 측정하였으며 가교제 및 가교도 에 관계없이 가교 후 기체의 확산 감소로 인해 네 기체 모두 투과도가 감소하였다. 반면에 CO2/CH4, O2/N2 기체쌍의 선택도는 가교 전보다 향상된 결과를 나타내었다.
Keywords: gas separation, membrane, chemical crosslinking
2P-513
Synthesis and properties of blue-light-emitting anthracene derivativewith bulky substitution product.
백장열·김윤희*,†·권순기·천예림*·황재영*·이지상 경상대학교 고분자공학,* 경상대학교 화학
A series of blue light emitting small molecule materials based on anthracene derivatives have been synthesized by Grignard reaction, Suzuki coupling reaction, etc. These materials showed bright blue emission and good thermal stability due to rigid structure of anthracene. Several doped device using these anthracene derivatives used for emitting layer had been fabricated. The devices based on host (BSA) and dopants (DMF1A or DMF2A ) showed good EL performance. Device based on host (BSA) and dopant (DMF1A) showed maximum current efficiency (5.54 cd/A) and maximum power efficiency (2.96 lm/W).Device based on host (BSA) and dopant (DMF2A) showed maximum current efficiency (4.10 cd/A) with CIE (0.15, 0.20).
Keywords: blue emitting material, OLED
2P-514
Thermal, mechanical, rheological properties and shape memory effects of maleated polyolefin elastomer/Nylon11 blend nanocomposites with halloysite nanotube
김태현·장영욱†
한양대학교 ([email protected]†)
Polymer nanocomposites reinforced with small amounts of inorganic nanofillers have been regarded as a important class of materials. Halloysite nanotube (HNT), a tubular type nanoclay, has been recognized as an effective nanofiller for various polymers. In this study, we observe that maleated semicrystalline polyolefin elastomer (mPOE)/nylon 11 blends prepared by a melt mixing exhibit thermoplastic elastomer-like behavior along with shape memory effects when the nylon 11 content is up to 30 wt% in the blend. mPOE/nylon 11 blend (70/30) nanocomposites with HNT were also fabricated by melt mixing process, and their thermal, mechanical, rheological properties and shape memory effects were investigated.
Keywords: mPOE/nylon 11 blends, thermoplastic elastomer, HNT, nanocomposites
2P-520
Gas permeation properties of copolyimide membranes containing durene moiety 이정무·남상용*,†
애경유화,* 경상대학교 나노·신소재공학부 고분자공학전공 ([email protected]†)
The gas separation membrane for on-board inerting gas generating systems (OBIGGS) is the best way to avoid damage to the fuel tank and explosion. The aromatic polyimide materials for gas separation membrane have been studied due to good chemical resistance and excellent mechanical strength [1]. The polyimide containg durene diamine and 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) exhibits high gas permeability, but it has low selectivity [2]. In this study, the copolyimides based on 6FDA-durene were synthesized with rigid diamine by chemical imidization in order to overcome the disadvantage. Polyimide obtained via chemical imidization is possible to make at low temperature and good solubility. The copolyimide membranes were prepared by solvent evaporation method to evaluate their gas transport properties using Time-lag at 30 ºC. The chemical structures of prepared copolyimides were confirmed by FT-IR and NMR.
The chemical and mechanical properties of copolyimides were evaluated by TGA, DSC, XRD Keywords: gas separation membrane, polyimide
[나노]
1P-17
에어로졸 공정에 의한 다공성 TiO2 제조 및 염료감응형 태양전지 특성평가 조은희*,**·장한권*,**·김선경*,***·노기민*·장희동*,**,†
*한국지질자원연구원,**과학기술연합대학원대학교,***서강대학교 ([email protected]†)
염료감응형 태양전지(Dye-sensitized solar cell, DSSC)는 기존의 화석연료를 대체할 친환경 에너지 자원으로서 저 렴한 제조비용과 간단한 제작공정, 20년 이상의 긴 수명을 가지는 장점으로 많은 주목을 받고 있다. 이러한 DSSC에 적용되는 TiO2 나노입자는 광학적으로 안정하고 넓은 밴드 갭과 비표면적을 가지며, DSSC의 효율을 증가시키기 위한 중요한 변수이다. 따라서 DSSC의 효율을 향상시키기 위해서는 TiO2 광전극으로 효과적인 전해질 주입과 염료의 흡수 율을 증가시키는 것이며, 이것은 TiO2의 공극구조와 형상에 크게 의존한다.
본 연구에서는 넓은 비표면적을 갖는 다공성 TiO2를 제조하기 위하여 TiO2 sol과 Polyethylene glycol (PEG)의 혼합 용액으로부터 에어로졸 공정을 이용하여 다공성 TiO2 분말을 제조하였다. 제조된 분말은 FE-SEM, BET, BJH 등을 이용하여 분말의 형상, 비표면적, 공극특성을 분석하였고, Solar simulator를 이용하여 DSSC의 효율을 측정하였다. 제 조된 분말은 크기가 약 1 ㎛인 구형의 다공성 형상을 가지며, 비표면적은 최대 103 m2/g으로 나타났다. 다공성 TiO2를 적용한 DSSC의 효율을 측정한 결과, 기존 TiO2 보다 향상된 효율을 나타내었다.
Keywords: 다공성 TiO2, Polyethylene glycol, 태양전지
1P-32
Fabrication of silica hollow nanotube via vapor phase synthesis with selective functionalization on inner & outer surfaces
이충현·장정식†
서울대학교 ([email protected]†)
Silica hollow nanotubes were fabricated using vapor phase synthesis of silica precursor with hard template method. In particular, inner and outer surface of silica hollow nanotube were readily treated with various silanes and respective functional groups, such as amino group, carboxyl group, and fluorine group, were identified with FT-IR analyses. In addition, poly (acrylic acid) (PAA) was deposited inside the wall of silica hollow nanotube via vapor deposition polymerization, amplifying the carboxyl group. This PAA-functionalized silica hollow nanotube worked as a Pd catalyst support, catalyzing Heck-coupling reaction of aryl iodide and olefin.
Selective functionalization technique on substrate can be further applied in various application, such as catalysis or drug delivery system.
Keywords: silica, nanomaterial, silane functionalization
1P-64
Solventless thermal decomposition method for the synthesis of copper nanoparticles
최은진·이소희·박원철†
서울대학교 ([email protected]†)
Copper (Cu) nanoparticles were prepared by facile solventless heat treatment method, in which copper (II) formate was dissolved in xylene by surface modification with hexadecylamine and mixed with salt powder as a matrix for preventing aggregation of the nanoparticles. Through the thermal treatment process, spherical Cu
nanoparticles were synthesized and stabilized in ethanol after removing salts using aqueous hydrazine solution.
The synthetic procedure provides a simple and scalable approach for mass production and can be widely applied to prepare other metal nanoparticles or alloy nanoparticles.
Keywords: Cu nanoparticles, solventless method, thermal treatment
1P-65
Ink jet printing을 위한 수용성 silver complex ink의 제작
김석준·인인식†·박영호
한국교통대학교 나노화학소재공학과 ([email protected]†)
기존에 사용되고 있는 photolithography나 물리적 화학적 증착 등의 방식은 경제적, 환경적 문제등으로 많은 한계에 봉착하여 있다. 그 때문에 그 대안으로써 roll to roll, screen tprinting, ink jet printing, micro gravure printing 등의 간단 하면서도 적은 비용으로 빠른 생산이 가능한 인쇄 전자기술들이 주목받고 있다. 그 중에서 본 연구에서는 silver 를 ink jet printing 소재로써 사용하기 위하여 silver 원자가 다른 분자와 결합 하여 complex를 형성한 구조를 갖는 silver complex ink를 합성하는 연구를 하였으며 Touch panel, RFID, flexible display등으로 응용되기 위한 silver ink 의 물성 및 특성에 대해 연구하였다.
Keywords: ink jet printing, 수용성 silver complex ink, silver complex ink
[무기재료]
2P-38
Effects of surface modification on EMI properties of electroless nickel plated MWCNTs
이시은·김도영·윤국진·이영석†
충남대학교 ([email protected]†)
In this study, the multi-walled carbon nanotubes (MWCNTs) were plated with nickel using electroless plating method according to the time of plating. Uniform nickel film on MWCNTs is plated by this method. The nickel electroless plated MWCNTs were investigated by shielding electromagnetic interference(EMI). EMI shielding efficiency of nickel electroless plated MWCNTs was measured to be 16 dB under 800MHz band, which was increased by 1.6 times compared to that of the untreated MWCNTs. This improvement was attributed to the uniform nickel plating of film form compared to spherical form on MWCNTs.
Keywords: electroless plating method, electromagnetic interference (EMI)
2P-40
Synthesis of F-TiO2/TiOF2 mixture for photocatalyst
정진영·이다영·박미선·이영석†
충남대학교 ([email protected]†)
The mixture of F-TiO2/TiOF2 has been synthesized using titanium (IV) isopropoxide (TTIP) as titanium source by thermal fluorination at high temperature according to different partial pressure of fluorine gas. The morphological properties and crystalline of thermally fluorinated photocatalysts were investigated using X-Ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results showed that the crystal form of F-TiO2/TiOF2 mixture was generated with different ratios by thermal fluorination. With increase of the fluorine
partial pressure, ratios of cubic-shaped TiOF2 increased compared to globular-shaped TiO22. Also, the degradation rate constant of thermally fluorinated photocatalysts in high partial pressure of fluorine gas exhibited approximately 70 times more than that of non-fluorinated TiO2. It is due to increase of the surface hydroxyl group content and oxygen vacancies.
Keywords: F-TiO2, TiOF2, thermal fluorination, photocatalysts, oxygen vacancies
[생물공학]
2P-106
Extraction and transesterification of triglyceride from wet microalgae for the production of biodiesel
이옥경·이주희·허동훈·이은열†
경희대학교 화학공학과 ([email protected]†)
Microalgae are a source of renewable oil for biodiesel production, as well as a feedstock for the production of additional biofuel and chemicals. Large amount of water in wet biomass hampers an efficient extraction and conversion of algal lipids to biodiesel. Dewatering and drying of wet microalgae is cost- and energy-intensive process. In this study, we conducted lipid extraction and transesterification of the extracted lipid for biodiesel production from wet microalgae biomass. More than 85% of total lipids were extracted from wet microalgae (75% moisture) using dimethylcarbonate/methanol mixture, and then 70% of the extracted lipids were converted to FAMEs.
Keywords: wet microalgae, extraction, transesterification, biodiesel
2P-56
Cell-free synthesis and in situ immobilization of recombinant Clonorchis sinensis proteins for the screening of effective antigen candidates
이승원·김동명†
충남대학교 정밀응용화학과 ([email protected]†)
Development of effective antigens is demanded for efficient diagnosis and treatment of the parasite infection.
While it is required to express and purify the recombinant proteins of the parasite for screening of novel antigens, cell-based expression method is time consuming and laborious. In this study, we explored a novel approach of cell-free expression and in situ immobilization of antigen to overcome the present limitations in antigen screening procedures. 5`-biotinylated PCR products of the genes were immobilized on agarose bead coated with streptavidin. When the DNA-conjugated agarose beads were incubated in a reaction mixture for cell-free synthesis, expressed proteins were immobilized on the same bead. Through this method, we were able to discover novel proteins that showed strong antigenicity. We expect that the effectiveness and throughput of cell-free expression and screening of antigenic proteins can be further improved when integrated with FACS.
Keywords: cell-free synthesis, FACS, in situ immobilization
[석유화학⋅윤활유]
1P-107
Effects of the chain length of tris(carboxyalkylamino)triazine derivatives on their corrosion inhibition properties
유승현·김영운†·정근우·김남균
한국화학연구원 ([email protected]†)
The corrosion inhibition properties of triazine derivatives (Tris-Cn) containing amine groups and various lengths of alkyl carboxylic acid groups were studied. It was found that the Tris-Cn behaved like mixed type and adsorptive corrosion inhibitors. It was also observed that with increasing alkyl chain length of Tris-Cn, the corrosion inhibition property of triazine derivatives enhanced significantly.
Keywords: corrosion inhibitor, acid solution, triazine
1P-111
C3 키랄 화합물 제조를 위한 촉매의 제조와 반응 특성
이선호·전상권·양진영·박근우·이경찬·김건중†
인하대학교 ([email protected]†)
키랄 에피클로로히드린(Chiral Epichlorohydrin)은 항에이즈 의약품, 고지혈증 치료제, 항생제 등 수많은 의약품의 핵심 기초 물질로 사용된다. 본 연구에서는 키랄살렌 촉매를 현택환 메조 실리카에 담지시키고 고정하여 Heterogenious촉매로 만들고, 라세믹 ECH(Epichlorohydrin)를 출발물질로 하여 촉매반응을 통한 높은 광학적 선택 성을 갖는 키랄 ECH를 제조하였다. 이러한 기능을 갖는 촉매를 제조하기 위해 현택환 메조 실리카에 THF를 용매로 사용하여 살렌 촉매를 내부로 담지 시킨 다음, TEOS(Tetra orthosilicate)와 C8 Silane을 이용하여 졸을 만들어 현택환 메조 실리카의 표면을 덮고 건조하였다. 이렇게 만들어진 촉매는 TEM분석과 BET분석을 이용하여 물성을 분석하였으 며, 또한 ECH와의 촉매반응을 통한 광학 선택성을 GC분석을 통해 확인할 수 있었다. 담지화 된 후 고정된 촉매는 반 응이 끝난 후에 회수를 하여 재사용 하는데 용이하였으며, 높은 광학 선택성을 가지는 ECH를 얻을 수 있었다.
Keywords: 촉매, 키랄
[에너지저장⋅변환]
2P-100
Biocatalytic production of long-chain dicarboxylic acids from ricinoleic acids using recombinant escherichia coli
이재훈·이은열†
경희대학교 ([email protected]†)
Biocatalytic production of functional monomers from biomass such as plant oil has attracted much attention in sustainable chemical industry. Long-chain dicarboxylic acids (DCA) can be used to produce a variety of polymers, functional chemical products or intermediates. In this study, we produced DCA using the recombinant Escherichia coli expressing the alcohol dehydrogenase (ADH), Baeyer–Villiger monooxygenase (BVMO) and esterase. Culture condition for obtaining recombinant cells with high activity was optimized, and reaction conditions for biotransformation of ricinoleic acid to DCA were also optimized.
Keywords: dicarboxylic acids, ricinoleic acids, alcohol dehydrogenase, Baeyer–Villiger monooxygenase, esterase
2P-143
Graphene decorated vanadium pentoxide nanobelts as an efficient counter electrode for dye-sensitized solar cells
이민오·Suresh kannan balasingam·조임현·전용석*,†
UNIST,* Konkuk University ([email protected]†)
Various compositions of graphene decorated vanadium pentoxide nanobelts (GVNBs) are synthesized via one-step hydrothemal method. The dye-sensitized solar cells (DSSCs) using GVNBs as a counter electrode showed an exellent catalytic effect for the reduction of triiodide to iodide. As a consequence, the power conversion efficiency (PCE) of DSSCs made of GVNB materials is higher than that of the conventional platinum based electrode.
Keywords: vanadium pentoxide, graphene, counter electrode, dye-sensitized solar cells
2P-146
Effect of alkyl chain length on charge transfer at interface for dye-sensitized solar cells based on organic sensitizers
조효정·남정은·김대환·강진규†
DGIST ([email protected]†)
Over the last decade, dye-sensitized solar cell (DSSC) based on Ru-Complexes have been attracted much attention due to the high solar-to-electricity conversion efficiency up to 12% as well as low cost compared with p-n junction photovoltaic devices. Recently, organic dye molecules benefit from lower fabrication costs and higher molar extinction coefficients than Ru-dyes but generally produce less efficient solar cells. According to our recent report, it was observed that the electron lifetimes (τ) for the DSSCs with organic dyes were shorter than with a Ru dye. And we found that the long alkyl chain not only increases open-circuit voltage, but also decreases the electron recombination rate. In this work, organic photosensitizing dyes containing a phenothiazine framework with different alkyl chain length in the chromophore were synthesized to investigate the correlation between the alkyl chain length and photovoltaic properties as photosensitizers for DSSC.
Keywords: organic dye, recombination, DSSC
2P-160
Effective dispersion and exfoliation through controlling pH of graphene oxide for graphene/styrene composites
이민철·홍창국†
전남대학교 ([email protected]†)
Graphene is outstanding material which has a two-demension carbon structure because of its unique physical, chemical, and mechanical properties. therefore, Graphene has been attracted as nanofiller for nanocomposites.
Chemical modified graphene has been promising method to achieve mass production of Graphene.
Polystyene/Graphene composites was produced because Styrene has widely used to a variety of product.
Graphene oxide was prepared by modifided Hummers method. And then filteration with glass filter was conducted for Neutralization of GO. subsequently, horn-sonication was carried out in 30mins for exfoliation of Graphene Oxide. Also aGO was reduced by Hydrazine hydrate. and then 01.M HCl was dropped in as-prepared
GO(aGO) owing to blending styrene and aGO. Also As time goes on, styrene/Graphene mixture was turned like a gel. Stryrene/Graphene composites was made by drying the mixture in vacuum oven at 80°C. In conclusion, Electrical and Mechanical Properties was compared GO/Styrene to GO/Styrene composites.
Keywords: graphene, styrene, composite, dispersion, exfoliation, pH
2P-162
The Effect of new additive for highly conductive PEDOT:PSS films
안미임·권세진·송호준·신교직·최경호·이상국†
한국생산기술연구원 ([email protected]†)
poly(3,4-ethylenedioxythiophene):poly(stryensulfonate)(PEDOT:PSS) is the most simple conducting polymer.
PEDOT:PSS films have high transparency and mechanical flexibility. However, PEDOT:PSS have a problem of low conductivity. In this study, we have tried to improve low conductivity PEDOT:PSS by using sulfuric acid based additive. The conductivity of PEDOT:PSS films was significantly enhanced that the depended on the amount of sulfuric acid based additive and annealing temperature. We examined conductivity, sheet resistivity and transmittance of PEDOT:PSS film. Also, We investigated morphological properties of PEDOT:PSS films by AFM.
Keywords: conducting polymer, PEDOT:PSS, conductivity
2P-163
CuO-TiO2 nanostructure for CO2 conversion to methane
김혜림·인수일†
대구경북과학기술원 ([email protected]†)
One of the recent problems concerning people is the sharp escalation in the level of carbon dioxide in regards to global warming. For solve the problem, the later research stream employs two main processes;
thermochemical and photochemical for conversion of CO2 into useable products. The photochemical conversion is a cost effective and preferred process for the photoreduction of CO2 into useful liquid fuels like methanol, formaldehyde, and methane gas. Here, we describe the simply synthesizing the CuO-TiO2 nanostructure, a hybrid material photocatalyst. The synthetic method uses CuS nanostructure using electrochemical anodization and embedded titanium isopropoxide as Ti precursor, oxidation of the Cu and Ti to form CuO-TiO2
nanostructures at low-temperature (400 ℃) condition.
Keywords: photocatalyst
2P-167
Side chain effects on the crystallinity and solubility of conjugated polymers in organic photovoltaics
고의진·송관욱·백경훈·문두경†
건국대학교 ([email protected]†)
In recent years, many types of side chains were introduced to conjugated polymer backbones for enhancing molecular weight, solubility and processability. Moreover, these enabled conjugated polymers and fullerene derivatives to mix properly, and controlled intermolecular interaction. Benzo[1,2-b:4,5-b`]dithiophene(BDT) is
well known as a good electron donating unit, having a good carrier mobility and coplanar structure.
Polythiophene showed a good hole mobility, but had low solubility in common organic solvents.
In this study, BDT and bithiophene were polymerized by Stille coupling reaction. The synthesized polymers, PBDTBiTh(2EH) and PBDTBiTh(12C), had 2-ethylhexyl and n-dodecyl side chain on the 4,4` positions of bithiophene, respectively. The synthesized copolymers were characterized by 1H-NMR, GPC, UV-visible spectroscopy and cyclic voltammogram.
Keywords: crystallinity, solubility, stille coupling reaction, absorption coefficient, organic photovoltaics
2P-179
Fabrication of Cu2ZnSn(S,Se)4 films by selenization of stack precursor layers
손대호·김대환·김영일·양기정·박시내·심준형·강진규†
대구경북과학기술원 ([email protected]†)
A thin film Cu2ZnSnS4 (CZTS) solar cell has received much attention in recent years. CZTSs earth-abundant and non-toxic elemental composition makes it an ideal candidate to replace Cu(In,Ga)Se2 (CIGS) and CdTe solar cells which face material scarcity and toxicity issues. In this work, we demonstrate a simple route to fabricate CZTS and CZTSSe films by using RF/DC sputtering from stacking orders of metal precursor. The CZTS and CZTSSe absorber layer was simply fabricated for sulfurization and selenization annealing process of metal precursor film in the presence of S. The effects of the different annealing temperature in the metal precursor having S on the structural, morphological, electrical properties of CZTS and CZTSSe absorber films were investigated.
Keywords: CZTS, CZTSSe
2P-189
Extremely flexible silver nanowire-graphene hybrid transparent electrode for organic photovoltaic devices
이동화·이형진·안유미·이윤구†
대구경북과학기술원 ([email protected]†)
Transparent electrodes (TEs) based on indium tin oxide (ITO) have been widely used as an essential element of various organic photovoltaic (OPV) devices. However, it possesses several drawbacks such as high cost, brittleness, and high processing temperature. Therefore, cheap, flexible, and solution-processed TEs have been required for emerging OPV devices. Recently, silver nanowires (AgNWs) TE showed the superior optical and electrical performance comparable to ITO. However, they still have issues on a long-term stability and electrical connection, which make them difficult for practical use. In this work, we fabricated a AgNW-Graphene hybrid TE to overcome its issues due to the graphene layer acted as both efficient electron transport pathway and excellent gas-barrier property. Furthermore, OPV devices with the AgNW-Graphene hybrid TE showed excellent photovoltaic performance as well as superior long-term stability under ambient conditions.
Keywords: AgNW, graphene, transparent electrode
2P-202
금속치환 페라이트를 이용한 메탄 개질 반응으로부터의 합성가스와 수소 생산
이동희·김영호†·김효섭·박주식*
충남대학교,*한국에너지기술연구원 ([email protected]†)
구리 치환 페라이트의 격자 산소를 메탄가스와 반응시켜 합성가스를 생산하고, 이어서 환원된 금속 산화물을 물과 반응하여 순수한 수소 가스의 생산이 가능하다. 매체의 고온 안정과 반응성 향상을 위해 yttria-stabilized zirconia(YSZ)를 지지체로 이용했다. 함침법으로 제조된 구리 치환 페라이트는 900 ℃에서 85% 이상의 높은 메탄 전 환율을 보였으며, 이어서 700 ℃에서 물 분해 반응을 통해 수소를 생산했다. 구리 치환 페라이트에 대한 반복 운전 안 정성을 연구하였으며, 그 과정에서 생성되는 기체의 수율 및 메탄 가스의 전환율을 확인하였다.
Keywords: 메탄 개질, 페라이트, 합성가스, 수소
2P-204
Electrochemical properties of Lithium pre-doped graphene oxide for Li ion capacitor
조은아·박수진†
인하대학교 ([email protected]†)
In this work, we studied the electrochemical properties of lithium ion capacitor for amount of lithium ion pre-doped graphene oxide (Li-GOs). The elemental composition of the surface of the Li-GOs was characterized by X-ray photoelectron spectroscopy (XPS). The specific surface area and micropore volumes of the N-MCs were investigated using the Brunauer-Emmett-Teller (BET) and Dubinin-Radushkevich (D-R) equation respectively. Electrochemical measurements were performed in a three-electrode system using the cyclic voltammetry (CV). Electrochemical properties were enhanced with increasing of lithium ion amount on the Li-GOs.
Keywords: lithium ion capacitor, lithium pre-doping, graphene oxide
2P-221
Synthesis of multi-walled carbon nanotubes-porous silica composites impregnated with polyethyleneimine for CO2 capture
이민상·박수진†
인하대학교 ([email protected]†)
In this work, the multi-walled carbon nanotubes (MWCNTs)-porous silicas have been synthesized by hydrolysis with tetraethylorthosilicate (TEOS). Also, the prepared samples were impregnated with polyethyleneimine (PEI) for increasing of CO2 adsorption properties. The CO2 adsorption capacity was evaluated by TGA method in 15% CO2 condition, which was similar condition with fossil-fuel power plants. Pristine MWCNTs showed a low CO2 adsorption capacity due to their low microporosity. However, the MWCNT-porous/PEI had higher CO2 adsorption capacity and good cycle stability in CO2 capture experiment with TGA method.
Keywords: carbon nanotubes, carbon dioxide capture, polyethyleneimine, TGA method
2P-228
Tuning of thermal properties and impregnation of erithritol as phase change materials by blending with expanded graphite
신혜경·박미라*·박수진† 인하대학교,*전북대학교
The use of Phase change material (PCM) is one of the routes for the storage of transitory excessive energy from industry for use at a more suitable later time. One of the materials with a high energy storage over 100
℃ is erithritol, on which several studies were conducted to solve the thermal properties and impregnation problems by adding the additives. Therefore, in this article, Erithritol/ expanded graphite (EG) composites for PCM were prepared according to EG concentration. A variety of EG concentrations were respectively added into the molten erithritol solution in order to study the effect of EG concentration as the additives on the thermal properties and impregnation of erythritol as PCM. The structure of the PCM composite was characterized using scanning electron microscopy. The improvement of the thermal conductivity of erythryitol/EG composites were investigated and the latent heat for impregnation and thermal stability of erithritol/EG composites were evaluated by differential scanning calorimetry (DSC) measurement.
Keywords: phase change material,erythritol, thermal property, latent heat
2P-231
Enhanced and tunable side chain using benzodithiophene and thiophene in polymer solar cells
이태호·전성재·허정림·문두경†
건국대학교 ([email protected]†)
Polymer solar cells (PSCs) have attracted considerable attention as a promising long-term solution, renewable energy, flexibility and lightweight. Bulk heterojunction(BHJ) solar cells, with an active layer comprising an interpenetrating network of conjugated polymers and fullerene derivatives, have been extensively studied and display the highest efficiencies to date in PSCs. Benzodithiophene(BDT) unit is attractive due to its compact planar structure that could be beneficial to the electron delocalization and improve mobility into various conjugated polymers. 2D Thiophene spacer was introduced in polymer side chain for increasing charge transporting property and π-conjugation length. In this study, we synthesized 2D BDT copolymer and investigated their PSCs property.
Keywords: polymer solar cells, bulk heterojunction, benzodithiophene, side chain
2P-251
Surface coverage-tunable, multifunctional semi-interpenetrating polymer network-nanoarchitectured lithium ion cathode materials for high voltage battery
김주명·박장훈·이창기*·이상영†
울산과학기술대학교,*한국생산기술연구원
Surface coverage-tunable, multifunctional conformal layer based on semi-interpenetrating polymer network(semi-IPN) nanoarchitecture is presented as a new concept of interface engineering for lithium-ion cathode materials. This unusual semi-IPN nanoarchitecture is composed of thermally-cured polyimide(PI) and
polyvinyl pyrrolidone(PVP) and also exhibits well-adjusted polarity matching with cathode materials (here, LiCoO2(LCO) powders are chosen as a model system). This structural feature allows the PI/PVP semi-IPN effectively suppresses direct exposure of LCO to liquid electrolytes. In addition, the presence of pyrrolidone ring bearing Lewis basic site enables the PI/PVP semi-IPN nanoarchitecture to effectively trap hydrofluoric acid that poses as a critical threat to trigger unwanted side reactions in cells. Owing to the aforementioned combined effects, the PI/PVP semi-IPN significantly improves cell performance and thermal stability of high-voltage charged LCO.
Keywords: semi-interpenetrating, high voltage, cathode, lithium ion battery
2P-299
Studies on electrochemical multivalent ion intercalation into the calcium ferrite type structure, XRu2O4
허종욱·홍승태†
DGIST ([email protected]†)
Multivalent ion intercalation is one of the good strategies to overcome capacity limit of LIB. However, only a few materials have been reported for the electrode materials that can intercalate multivalent ions reversibly.
LiRu2O4 has been synthesized by ion exchange form NaRu2O4. LiRu2O4 is the calcium ferrite (CaFe2O4)-type structure with one-dimensional tunnels. One dimensional Li array is placed inside these tunnels. It has been reported that Li ion can be electrochemically intercalated into the LiRu2O4 along 1-d tunnel. Herein, Ru2O4 was synthesized by electrochemical Li ion extraction from LiRu2O4. Its electrochemical intercalation properties of multivalent ions such as Mg2+ and Zn2+ have been characterized together with its structural changes.
Keywords: multivalent ion intercalation, crystallography
2P-310
Efficient organic dye composed of phenothiazine and carbazole chromophore for dye-sensitized solar cells 이치환·Le Quoc Bao·조효정*·강진규*·김재홍†
영남대학교 화학공학부,*대구경북과학기술원 차세대융복합연구센터
Organic dyes are suitable as photosensitizers for the Dye-sensitized Solar Cell (DSSC) because they have many advantages, such as high molar extinction coefficients, convenience of customized molecular design for desired photophysical and photochemical properties, inexpensiveness with no transition metals contained, and environment-friendliness. This result suggests that smartly designed and synthesized metal-free organic dyes are also highly competitive candidates for photosensitizers of DSSCs with their advantages mentioned above.
Organic photosensitizers based on carbazole and phenothiazine chromorphores with multi-acceptors/anchors were synthesized and applied to DSSCs.
The judicious choice/design of the donor and acceptors permits the relatively high power conversion efficiency in organic dye containing cyanoacrylic acid as the electron acceptor.
Keywords: organic dye, dye-sensitized solar cells
