نتایج جستجو برای: polyelectrolyte multilayer composite

تعداد نتایج: 143945  

Journal: :Biomacromolecules 2004
Bingyun Li Donald T Haynie

Designed polypeptides and electrostatic layer-by-layer self-assembly form the basis of promising research in bionanotechnology and medicine on development of polyelectrolyte multilayer films (PEMs). We show that PEMs can be formed from oppositely charged 32mers containing several cysteine residues. The polypeptides in PEMs become cross-linked under mild oxidizing conditions. This mimicking of d...

Journal: :Dalton transactions 2013
Natasha H Munro Kathryn M McGrath

Understanding the formation of biominerals like nacre can lead to the fabrication of more advanced biomimetic materials. Several factors are known to influence the final form of both native nacre and biomimetic synthetic variants. Two important components in calcium carbonate biominerals such as nacre are the organic scaffold and the acidic proteins. Interactions between these two components ma...

Journal: :Magnetic resonance imaging 2007
Petrik Galvosas Ying Qiao Monika Schönhoff Paul T Callaghan

Two-dimensional (2D) nuclear magnetic resonance (NMR) methods for the investigation of correlation and exchange have been introduced in recent years and have been applied to a range of different systems. Here, we report on the use of 2D NMR diffusion-diffusion correlation spectroscopy for the investigation of diffusion anisotropy in cellular plant tissues and of diffusion-diffusion exchange spe...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2011
Daniel K Beaman Ellen J Robertson Geraldine L Richmond

Understanding the interfacial adsorption of polymers has become increasingly important because a wide range of scientific disciplines utilize these macromolecular structures to facilitate processes such as nanoparticle assembly, environmental remediation, electrical multilayer assembly, and surfactant adsorption. Structure and adsorption characteristics for poly(acrylic acid) at the oil-water i...

Journal: :Computers & Graphics 2001
Hideki Hirayama Kazufumi Kaneda Hideo Yamashita Yoshimi Monden

This paper proposes an accurate illumination model for rendering objects coated with multilayer films. Optical phenomenaof multilayer films are caused by reflection, refraction, interference, and absorption of light inside each layer of multiple films, and these physical phenomena are complicatedly related with each other. The proposed method calculates composite reflectance and transmittance o...

Journal: :Nano research 2014
Yung Yu Wang Peter J Burke

We apply polyelectrolyte multilayer films by consecutive alternate adsorption of positively charged polyallylamine hydrochloride and negatively charged sodium polystyrene sulfonate to the surface of graphene field effect transistors. Oscillations in the Dirac voltage shift with alternating positive and negative layers clearly demonstrate the electrostatic gating effect in this simple model syst...

Journal: :The Journal of chemical physics 2008
Oleh M Tanchak Kevin G Yager Helmut Fritzsche Thad Harroun John Katsaras Christopher J Barrett

Neutron reflectometry was used to determine the distribution of salt ions and water in thin poly(acrylic acid) and poly(allylamine hydrochloride) polyelectrolyte multilayers assembled with and without salt. Increasing salt concentration reverses the exclusion of water from the substrate region, eventually leading to an asymmetric segregation of water near the substrate at high salt concentratio...

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