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Ultrathin Polymer Network by Using Sodium Dioctadecyl Sulfate as Monolayer Template
Lee,Burm-Jong 인제대학교기초과학연구소 1998 자연과학 Vol.2 No.-
폴리(말레산-alt-메틸 비닐 에테르) (MA-MVE)와 폴리(알릴아민) (PAA)의 이차원 가교화 Langmuir-Blodgett (LB)막을 디옥타데실 황산 나트륨 (2C18S)을 일분자막 주형으로 사용하여 제조하였다. 일분자막 주형은 열처리와 추출을 통하여 제거되었다. 주형 2C18S, MA-MVE, 그리고 PAA의 세 성분에 의한 다중 이온 착체 일분자막이 공기-물 계면에서 형성되었다. 이들 일분자막은 표면 입력-면적 등 온선을 통하여 연구되었으며, Y 형태로 고체 기판에 이전되었다. 다중 이온 착체 LB막의 분석은 FT-IR 분광법, XPS 분광법, 그리고 주사 전자현미경 (SEM)을 이용하여 수행되었다. 망상 고분자막의 형성은 이들 막을 진공하에서 열처리하여 분자간 아미드 또는 이미드 결합을 형성함으로써 이루어졌다, SEM 관찰 결과 다중이온 착체 상태에서 6 개중의 LB막으로 직경 0.1μm인 다공성 플루오르화탄소 막필터의 피복이 가능함을 확인하였다. 열처리에 이온 추출 결과 막에 미세 구멍 결함이 발생하였다. Two-dimensionally cross-linked Langmuir-Blodgett (LB) films of poly(maleic acid-altmethyl vinyl ether) (MA-MVE) and poly(allylamine) (PAA) were produced by using sodium dioctadecyl sulfate (2C18S) as the monolayer template which was subsequently removed by thermal treatment followed by extraction. The polyion-complexed monolayers of three components, i.e., template 2C18S, MA-MVE, and PAA, were formed at the air-water interface. Their monolayer properties were studied by the surface pressure-area isotherm. The monolayers could be transferred on solid substrates as Y type. The polyion-complexed LB films were characterized by FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The cross-linking to form a polymer network was achieved by amide or imide formation through heat treatment under a vacuum. SEM observation of the film on a porous fluorocarbon membrane filter (pore diameter 0.1 μm) showed covering of the pores by six layers in the polyion complex state. Extraction by chloroform followed by heat treatment produced hole defects in the film.
Surface-Enhanced Raman Spectroscopic Studies of Oriented Monolayers on Electrode Surfaces
Yoon, Wan-Shik,Im, Jung-Hyuk,Kim, Jae-Ho 한국분석과학회 1995 분석과학 Vol.8 No.4
Monolayers of hypericin, a photodynamic polycyclic quinoidal compound, were prepared at the air-water interface, and were transferred to metal substrates to form Langmuir-Blodgett (LB) monolayers. The structural characteristics of hypericin LB monolayers and self-assembled (SA) monolayers were investigated using surface-enhanced resonance Raman scattering (SERRS) spectroscopy. Both the spectroscopic data and the surface pressure - area (${\pi}-A$) isotherms suggest that hypericin forms ${\pi}-{\pi}$ aggregates that orient vertically to the subphase surface. Whereas the ordering and orientation of control was less effective in SA monolayers, a higher structural regularity was attained in LB systems. The effect of subphase on the structural integrity of the monolayer was also investigated.
Lee, Burm-Jong,Kim, Hee-Sang,Kim, Seong-Hoon,Son, Eun-Mi,Kim, Dong-Kyoo,Shin, Hoon-Kyu,Kwon, Young-Su Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.4
Two-dimensionally cross-linked ultrathin films of poly(maleic acid-alt-methyl vinyl ether) (MA-MVE) and poly(allylamine) (PAA) were produced by using sodium dioctadecyl sulfate (2C18S) as the monolayer template for Langmuir-Blodgett (LB) depositio n. The template molecules were subsequently removed by thermal treatment followed by extraction. The polyion-complexed monolayers of three components, i.e., template 2C18S, co-spread PAA, and subphase MA-MVE, were formed at the air-water interface. Their monolayer properties were studied by the surface pressure-area isotherm. The monolayers were transferred on solid substrates as Y type. The polyion-complexed LB films and the resulting network films were characterized by FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The cross-linking to form a polymer network was achieved by amide or imide formation through heat treatment under a vacuum. SEM observation of the film on a porous fluorocarbon membrane filter (pore diameter 0.1 ㎛) showed covering of the pores by four layers in the polyion complex state. Extraction by chloroform followed by heat treatment produced hole defects in the film.
고분자 이미다졸-금속 착제 LB막의 선책적 기체 투과성
김병주,이범종 인제대학교기초과학연구소 1999 자연과학 Vol.3 No.-
이미다졸-금속 이온구조를 갖는 고분자 Langmuir-Blodgett(LB)막을 다공성 막 필터 위에 제조하여 산소와 질소의 투과성을 이들의 캐스트 막과 비교하여 검토하였다. 양친매성 고분자 폴리(N-(2-(4-이미다졸일)에틸)말레이미드·alt-1-옥타데센)(IM-O)는 폴리(무수말레산-alt-1-옥타데센)과 히스타민의 반응으로 합성되었다. IM-O는 순수한 물 또는 금속 이온 (철(Ⅲ)과 코발트(Ⅱ)이온)하층액 위에서의 40 mN/m의 표면압력에서도 안정한 일분자막을 유지하였다. 이 일분자막은 30 mN/m의 표면 압력에서 FP-010 막 필터 위에 Y형태로 누적되었다. 이 다중막의 구조는 FT-IR을 통하여 확인하였다. LB막의 균일성과 안정성은 SEM 관찰을 통하여 간접적으로 평가하였고, 산소와 질소의 투과도는 감압법을 이용하여 측정하였다. 본 LB막들의 기체 선택성은 산소보다 질소가 약간 높게 나타났으며, 두 기체에 대하여 모두 고투과성을 나타냈다. 이들 고분자-금속 착체의 캐스트 막을 제조하여 기체 투과도를 측정한 결과 질소에 대한 선택성은 변함이 없었다. The permeability of oxygen and nitrogen was investigated from the polymeric LB films containing imidazole-metal ion complexes and compared with its corresponding cast films on porous membrane filters. The amphiphilic polymer, poly(N-(2-(4-imidazolyl)ethyl)-maleimide-alt-1-octadecene)(IM-O), was synthesized by reaction of poly(maleic anhydride-alt-1-octadecene)with histamine. Chloroform solutions of IM-O were spread on pure water and aqueous metal ions(iron(Ⅲ) and cobalt(Ⅱ)ions) and the monolayers showed high stability up to 40 mN/m against surface pressure. The monolyers of polyion-complexed polymers at the air-water interface can be transferred onto solid substrates such as a porous fluorocarbon membrane filter(FP-010) and a CaF2 plate. The Y-type deposition was found at a surface pressure of 30 mN/m. The molecular structures of LB films were investigated by means of FT-IR spectroscopy. The mechanical stability and uniformity of the LB films on FP-010 membranes were indirectly evidenced by SEM observation of the surface morphology of FP-010 membranes were indirectly evidenced by SEM observation of the surface morphology of FP-010 covered with the LB films. The permeability of oxygen and nitrogen was measured with the pressure method. The LB films showed more or less higher selectivity toward nitrogen, and high permeability was found to both the oxygen and nitrogen. The cast films of the corresponding polymer-metal complexes also showed preference to nitrogen in selectivity.
이종협,최인희,Younghun Kim,Sung Koo Kang,Jeongjin Lee 한국화학공학회 2005 Korean Journal of Chemical Engineering Vol.22 No.4
The fabrication of a metal microstructure on pre-patterned organic templates, prepared using SAM and LB techniques is described. The OTS derivatized substrate was oxidized by AFM anodic oxidation at the thresholdvoltage. Site-selective copper structure was then fabricated on the locally modified monolayer based on pre-designedpatterns. The sequential adsorption-reduction of copper ion was carried out, leading to improved metal coverage anda reduction in defects.
2-D microphase properties of novel ceramides assembled to intercellular lipid membranes
이보령,성민철,김진웅 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.1
In this study, we investigated how 1-O-acylceramide (CENP) and ceramide with ultra-long chain (C24-C32) (CULC) associate with ceramide NP (CNP), respectively. To characterize their structure, we fabricated a 2-D lipid membrane composed of ceramides/stearic acid/cholesterol, which mimics the intercellular lipid in our stratum corneum, by using Langmuir-Blodgett technology. The π-A isotherms of the lipid membranes revealed that CENP disturbed the association of lipid membranes, whereas CULC led to formation of closely packed membranes. Moreover, CENP showed a slower phase transition compared with CULC, which was confirmed by fluorescence microscopy. In addition, through the AFM analysis, we verified the CULC had the higher domains by associating between CNP and CULC more tightly than between CENP and CNP. We expect these findings of novel ceramides are able to contribute to the developed skin barrier function.