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Nurettin Sahiner,Alper O. Yasar,Nahit Aktas 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Poly(4-vinyl pyridine)-silica (p(4-VP)-silica) composites were synthesized via micro emulsion polymerization, and the capsule of p(4-vinyl pyridine), as cap-p(4-VP), was prepared by removing the core silica from p(4-VP)-silica composites by HF treatment. Dicationic particles in the form of cappoly( 4-vinyl pyridine)++-1,4-butane (cap-p(4-VP)++-C4), capsule-poly(4-vinyl pyridine)++-1,6-hexane (cap-p(4-VP)++-C6), and capsule-poly(4-vinyl pyridine)++-1,8-octane (cap-p(4-VP)++-C8) were prepared by modifying cap-p(4-VP) particles with corresponding dibromo alkanes. Then, polymer–metal composites were also prepared from cap-p(4-VP) and dicationic cap-p(4-VP) particles by loading CoCl2 from ethanol and the obtained composites were used in H2 generation from hydrolysis of NaBH4, and The Ea for the composite catalyst was calculated as 56.53 kJ/mol.
이지은,김동하 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Bimetallic Core@shell nanoparticles have demonstrated distinctly different properties and potential uses in electronics, magnetics, catalysts, optics, and sensors. Their versatility in a wide range of applications stems from their unique physical and chemical properties directly related to particle size, shape, and interparticle distance and surface properties. The unique properties of the gold nanoparticles (AuNPs) are originated from the localized surface plasmon resonance (LSPR) phenomenon, the coupling of light into the resonant oscillation of charge density on the nanostructured noble metal surface. Core@shell type nanospheres have also been utilized as a platform for integration of functionalities into both the core and shell. The interaction between two types of metal NPs selectively located in the core and shell may alter the LSPR property, depending on the relative amount of the two metal components, the relative distance between them and the shell thickness. We suggest a unique strategy to generate core@shell nanoparticles based on pH-sensitive AuNPs decorated with polymer shell. Concretely, pH-sensitive AuNPs having P4VP on the surface were first fabricated through SI-ATRP. Then, they were mixed with selected metal precursor solutions followed by reduction using reducing agent. The metal NPs thus incorporated were distributed uniformly in the P4VP polymer shells. We investigate the structural change during the sequential synthetic process. The bimetallic nanostructures of AuNP@P4VP nanocomposites containing another type of metal NP at the P4VP periphery exhibit a controlled sensing property in terms of the change in the refractive index of surrounding media and a typical electrocatalytic activity for methanol oxidation reaction.
pH 나노센서로의 응용을 위한 UV-가교 P4VP 박막에 고정한 금 나노입자의 특성
김민성,정연태,Kim, Min-Sung,Jeong, Yeon-Tae 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.11
In this report, we describe the use of gold nanoparticles (AuNPs) immobilized on pH. responsive, cross-linked poly(4-vinylpyridine) (P4VP) thin films, as a potential application for pH nanosensors. The methodology is based on the variation in surface plasmon resonance of immobilized AuNPs with changing the interparticle distances, caused by the swelling/deswelling of the pH responsive P4VP polymer films. The change in optical properties of the immobilized AuNPs in response to the pH of surrounding media was investigated by a simple yet powerful tool; UV-vis absorption spectroscopy. The swelling of the P4VP chains at pH 2 causes an increase in the interparticle distances of immobilized AUNPS ($\sim20nm$) and hence leads to a blue shift of 48 nm in their surface plasmon resonance band peak. On the other hand, when the surrounding media was altered from pH 2 to 10, a red shift of absorption maxima was observed. The changes were rapid, and the effect was reversible. This system could prove to be useful in fabricating nanosensors for detecting the pH or pH changes of surrounding aqueous medium.
SNIPS 공정을 이용한 블록공중합체 분리막의 구조 형성에 관한 연구
우상훈 ( Sanghoon Woo ),김진희 ( Jinhee Kim ),이정현 ( Junghyun Lee ),방준하 ( Joona Bang ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.2
In this work, we fabricated PS-b-P4VP block copolymer membranes from self-assembly and non-solvent induced phase separation (SNIPS), which combines the block copolymer self-assembly and conventional NIPS process. While previous studies mostly focused on the fabrication of well-defined structures, we systematically examined various processing parameters such as polymer concentration, solvent evaporation duration, solvent composition, and humidity, to optimized the membrane structures. As a result, the morphology of PS-b-P4VP membranes was optimized at a certain polymer concentration in solution and composition of volatile solvent at low humidity conditions, resulting in SNIPS separation membranes with well-defined nanopores on the surface, 75% of membrane porosity, and 18% of surface porosity.