|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Polymers, surfactants and nanoparticles at the gas-liquid interface: structures and interactionsтезисы доклада
- Автор: Khomutov G.B.
- Сборник: Book of Abstracts, XVIIth European Chemistry at Interfaces Conference (ECIC-XVII), 27 June-1 July, 2005, Loughborough, UK
- Тезисы
- Год издания: 2005
- Место издания: Loughborough, UK
- Первая страница: 38
- Последняя страница: 38
- Аннотация: POLYMERS, SURFACTANTS AND NANOPARTICLES AT THE GAS-LIQUID INTERFACE: STRUCTURES AND INTERACTIONS Gennady B. Khomutov Faculty of Physics, Moscow State University, 119992, Moscow, Russia; E-mail: gbk@phys.msu.ru Gas-liquid interface is a specific unique area where organized planar structures - layers composed of various amphiphilic compounds and polymers or nanoparticles can be formed and then deposited on solid substrates. Organized nanostructures of organic, inorganic or hybrid nature are a subject of great current interest for fundamental and applied research due to the set of novel unique physical and chemical properties perspective for technical applications. The elucidation of fundamental mechanisms of interfacial structure formation and transformation phenomena is important for development of new cost-effective nanofabrication methods with efficient tailoring and controlling the composition, structure and organization at the nanoscale level. Organized planar nanostructures are of particular interest due to the possibilities for application of scanning probe microscopy and electron microscopy techniques for their characterization and manipulation, and also because of potential compatibility with conventional and future planar technologies. In our paper we discuss effects of amphiphilic organic ligands, electrostatic and magnetic interactions involved in morphological control of inorganic and polymeric nanostructures formed at the gas-water interface. Noble metal and magnetic iron oxide nanostructures were formed by interfacial synthesis method [1,2]. In that method inorganic nanoparticles and nanostructures are fabricated via decomposition of insoluble metal-organic precursor compounds in a layer at the gas/liquid interface with following deposition of grown planar nanostructures on a solid substrate surface by Langmuir-Blodgett technique. The ultimately thin and anisotropic dynamic monomolecular reaction system was realized by that method with quasi-two-dimensional growth and organization of inorganic nanoparticles and nanostructures. Photochemical and redox reactions were used to initiate processes of interfacial nucleation and growth of inorganic phase [1,2]. It has been demonstrated that morphology of resulting inorganic nanostructures can be controlled efficiently by variations of growth conditions via changes in state and composition of interfacial planar reaction media with the same precursor, and by variations of ionic composition of the aqueous subphase. Ultrasmall noble metal (Au and Pd) nanoparticles, nanowires and organized planar disk, ring, net-like, labyrinth and very high surface area branchy nanostructures were obtained by that method using monolayers composed by amphiphilic compounds and water-insoluble precursors [2]. Experimental data show that amphiphilic ligand nature along with electrostatic and magnetic interactions are important factors of morphological control of interfacially-formed inorganic nanomaterials. Theoretical considerations indicate to the importance of system dimensionality in relation to the energy balance which determines specific features of structure organization in planar charged metallic and magnetic nanostructures. A requirement of a minimal Coulomb energy, the possibility of free electron redistribution and strengthened attractive interactions in metallic nanostructures can explain formation of a new form of nano-organized metal - very branchy net-like nanostructures with extremely extended “effective perimeter”. Highly-organized planar polymeric films and nanocomposites can be formed using interfacial synthetic and assembling approach [2-4]. Here we present results on the study of the structure of interfacially formed polymeric and composite films in dependence on the nature of aqueous phase components interacting with polymeric Langmuir monolayer. Organized polymeric Langmuir monolayers were formed with the use of water-insoluble amphiphilic polycation N-alkylated derivatives of poly(4-vinilpyridine). Linear charge density as well as hydrophilic-hydrophobic balance of quaternized poly(4-vinilpyridine) derivatives was varied by changing the extent of N-alkylation and the nature of alkyl groups. The effects of aqueous phase composition on the state and structure of polymeric layer were studied. The variation of pH value and presence of copper cations in the aqueous phase resulted in substantial changes of polymeric monolayer compression isotherm and the structure of deposited film. Interactions of aqueous phase magnetite colloid nanoparticles and polyelectrolytes with interfacial amphiphilic polycation monolayers were studied and the structure of resulting planar polymeric complexes was investigated. The effects of interfacial self-organization and formation of ordered nanostructures were analyzed. The developed methods are relatively simple, ecologically-friendly and thus could prove to be efficient practical instruments of molecular nanotechnology with potential of design and cost-effective fabrication of new controlled-morphology organized planar inorganic and polymeric nanostructured materials. 1. G.B. Khomutov, S.P. Gubin, Mat. Sci. Eng. C, 22 (2002) 141. 2. G.B. Khomutov, Adv. Colloid Interface Sci., 111 (2004) 79. 3. G.B. Khomutov, R.V. Gainutdinov, S.P. Gubin, V.V. Kislov, A.A. Rakhnyanskaya, A.N. Sergeev-Cherenkov, A.L. Tolstikhina, Surf. Sci., 566-568 (2004) 396. 4. G.B. Khomutov, R.V. Gainutdinov, S.P. Gubin, V.V. Kislov, V.V. Khanin, A.A. Rakhnyanskaya, A.N. Sergeev-Cherenkov, E.S. Soldatov, D.B. Suyatin, I.V. Taranov, A.L. Tolstikhina, Appl. Surf. Sci., 226 (2004) 149.
- Добавил в систему: Хомутов Геннадий Борисович