Wyniki wyszukiwania - BazTech

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Wielowarstwowe filmy polimerowe otrzymywane metodą LbL - warstwa po warstwie (ang. layer-bylayer) : rozwój i zastosowanie

Wójcik A.J.

Wiadomości Chemiczne

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2014

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[Z] 68, 9-10

897--918

EN

The production of varied materials with nanoscale precision requires both suitable components and a right method. In the past two decades, layer-by-layer (LbL) assembly has been proven to be a convenient and versatile technique for fabrication of functional films. The LbL method enables obtaining systems composed of a few or even hundreds layers of beforehand chosen substances, which are characterized by a thickness ranging from nano- to micrometers. The building blocks of LbL assembly include, but are not limited to, synthetic polymers, polymeric microgels, biomacromolecules, (nano)particles, dendritic molecules, and complexes of these species [1]. This method involves simple alternative adsorption of oppositely charged polyelectrolytes on supporting materials [2]. The LbL assembly can be driven by multiple weak interactions, including electrostatic interactions, hydrogen-bonds, halogen-bonds, coordination bonds, charge-transfer interactions, biospecific interactions (e.g., sugar–lectin interactions), cation–dipole interactions, and the combined interaction of the above forces, etc. The multilayered composite films fabricated by means of the LbL technique have generated much interest among researchers worldwide due to the simplicity of the whole process by which they are produced and their numerous applications such as antireflection coatings, superhydrophobic surfaces, electrochromic devices, biosensors, cell adhesion or resistance coatings, drug delivery systems, proton exchange membranes, solar-energy conversion devices, and separation membranes [3]. In this review the evolution of the LbL method and the applications of the multilayered polymer films were discussed.

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Wielowarstwowe cienkie filmy jako powłoki o właściwościach przeciwdrobnoustrojowych

Kruk T., Szczepanowicz K.

LAB Laboratoria, Aparatura, Badania

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2012

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R. 17, nr 1

57-61

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Energia aktywacji i mechanizm przewodzenia w polimerowych czujnikach wilgotności z polietylenoiminy

Chachulski B., Jasiński G., Jasiński P., Nowakowski A.

Elektronika : konstrukcje, technologie, zastosowania

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2008

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Vol. 49, nr 6

265-267

PL

W pracy przedstawiono wyniki badań polimerowych czujników wilgotności z chemicznie modyfikowanej polietylenoiminy (PEI). Wykorzystując zależność rezystancji czujników od temperatury i wilgotności względnej powietrza, wyznaczono wartości energii aktywacji związanej z jonowym przeniesieniem ładunku. Dokonano oceny wpływu rodzaju zastosowanego podłoża i odczynnika sieciującego na trwałość, właściwości elektryczne oraz na wartości energii aktywacji.

EN

Investigation results of humidity sensors based on chemically modified polyethyleneimine (PEI) are presented. Based on temperature and relative humidity dependence activation energy value, which is related to ionic charge transfer, was evaluated. Influence of sensor substrate and cross-linking agent on sensor durability, electrical properties and activation energy value is presented. Obtained results are confronted with literature.

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Fotochromowe własności cienkich filmów polimerowych

Ortyl E., Kucharski S.

Prace Naukowe Instytutu Technologii Organicznej i Tworzyw Sztucznych Politechniki Wrocławskiej. Konferencje

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2001

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Vol. 50, nr 23

351-354

EN

The trans-cis photoisomerization in thin films of polymethacrylate homopolymers and copolymers with azobenzene side groups was investigated by UV-VIS absorption spectra was recorded before and after light irradiation. Photoisomerization in copolymers was more pronounced than in homopolymers. Reorientation of azobenzene dye in polymer films during irradiation with lineary polarized light was observed. This orientation of chromofore groups in lineary polarized light induces anisotropy in polymer films. It makes these polymers attractive as potential optical storage materials.