نتایج جستجو برای: polyelectrolyte

تعداد نتایج: 3801  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2002
René Messina Christian Holm Kurt Kremer

We report results from a molecular dynamics simulation on the conformations of a long flexible polyelectrolyte complexed to a charged sphere, both negatively charged, in the presence of neutralizing counterions in the strong Coulomb coupling regime. The structure of this complex is very sensitive to the charge density of the polyelectrolyte. For a fully charged polyelectrolyte the polymer forms...

Journal: :Lab on a chip 2014
Gilad Kaufman Rostislav Boltyanskiy Siamak Nejati Abdou R Thiam Michael Loewenberg Eric R Dufresne Chinedum O Osuji

Common methods for fabrication of polyelectrolyte microcapsules rely on a multi-step process. We propose a single-step approach to generate polyelectrolyte microcapsules with 1-2 μm shells based on polyelectrolyte complexation across a water/oil droplet interface and study the effect of parameters controlling the polyelectrolyte complexation on shell thickness.

2014
Saugandhika Minnikanti Aveek Gangopadhyay Darwin R. Reyes

The formation of polyelectrolyte multilayers (PEMs) for the first time, two decades ago, demonstrating the assembly on charged substrates in a very simple and efficient way, has proven to be a reliable method to obtain structures tunable at the nanometer scale. Much effort has been put into the assembly of these structures for their use in biological applications. A number of these efforts have...

Journal: :Micro 2022

Novel biohybrid homo-polyelectrolyte-based nanocarriers were formed by the complexation of insulin (INS) with a biocompatible and cationic polyelectrolyte, namely, poly(vinyl benzyl trimethylammonium chloride) (PVBTMAC). According to light-scattering techniques, hydrophilic PVBTMAC homo-polyelectrolyte forms single chains in aqueous media. The resulting PVBTMAC/INS via electrostatic co-assembly...

Journal: :The Journal of chemical physics 2005
Rudi Podgornik Wayne M Saslow

We investigate polyelectrolyte bridging interactions mediated by charged, flexible, polyelectrolyte chains between fixed cylindrical macroions of opposite charge in a two-dimensional hexagonal crystalline array. We show that in the asymptotic regime of small macroion density, the polyelectrolyte-mediated attraction is long range, falling off approximately linearly with the macroion array densit...

Journal: :Nanotechnology, science and applications 2009
Bingbing Jiang John B Barnett Bingyun Li

There has been considerable interest in polyelectrolyte multilayer nanofilms, which have a variety of applications ranging from optical and electrochemical materials to biomedical devices. Polyelectrolyte multilayer nanofilms are constructed from aqueous solutions using electrostatic layer-by-layer self-assembly of oppositely-charged polyelectrolytes on a solid substrate. Multifunctional polyel...

2005
Abohachem Laguecir Serge Stoll

Monte Carlo simulations were used to investigate the conformational and electrical properties of isolated weak polyelectrolytes in the presence of an oppositely charged particle. Titrations curves were calculated to get an insight into the role of pH on the degree of ionization and conformation of isolated chains. The effect of ionic concentration and polyelectrolyte length on the titration cur...

2014
Deeksha Rishabha Malviya Pramod Kumar Sharma

Background: Polyelectrolyte complexes are complexes formed by interaction of two oppositely charged ions. This study deals with formation of chitosan–Aegle marmelos polyelectrolyte complex. Polyelectrolyte complex was found to be used as pharmaceutical excipient. Aim: The present study aimed to synthesize Chitosan–Aegle marmelos polyelectrolyte complex and their characterization and to compare ...

The objective of this investigation was the development of chitosan/xanthan polyelectrolyte complex based mucoadhesive nasal insert of promethazine hydrochloride a drug used in the treatment of motion sickness. A 32 factorial design was applied for preparing chitosan/xanthan polyelectrolyte complex and to study the effect of independent variables i.e. concentration of xanthan [X1] and concentra...

The objective of this investigation was the development of chitosan/xanthan polyelectrolyte complex based mucoadhesive nasal insert of promethazine hydrochloride a drug used in the treatment of motion sickness. A 32 factorial design was applied for preparing chitosan/xanthan polyelectrolyte complex and to study the effect of independent variables i.e. concentration of xanthan [X1] and concentra...

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