نتایج جستجو برای: polyelectrolyte

تعداد نتایج: 3801  

2016
Xiaoran Hu Matthew J. Feeney Ethan McIntosh James Mullahoo Feng Jia Qiaobing Xu Samuel W. Thomas

Combining the numerous advantages of using light as a stimulus, simple free radical random copolymerization, and the easy, all-aqueous preparation of polyelectrolyte complexes (PECs), we prepared photolabile PEC nanoparticles and demonstrated their rapid degradation under UV light. As a proof of concept demonstration, the dye Nile Red was encapsulated in the PECs and successfully released into ...

2015

This review work gives a lot of information on polyelectrolyte complexes (PECs). The complex formed is generally applied in different dosage forms for the formulation of stable aggregated macromolecules. Many properties like diffusion coefficient, chain conformation, viscosity, polarizability, miscibility, etc., are drastically changed due to the introduction of a polyelectrolyte. The formation...

2015
Sarah L. Perry Lorraine Leon Kyle Q. Hoffmann Matthew J. Kade Dimitrios Priftis Katie A. Black Derek Wong Ryan A. Klein Charles F. Pierce Khatcher O. Margossian Jonathan K. Whitmer Jian Qin Juan J. de Pablo Matthew Tirrell

Polyelectrolyte complexes present new opportunities for self-assembled soft matter. Factors determining whether the phase of the complex is solid or liquid remain unclear. Ionic polypeptides enable examination of the effects of stereochemistry on complex formation. Here we demonstrate that chirality determines the state of polyelectrolyte complexes, formed from mixing dilute solutions of opposi...

Journal: :Physical review letters 2016
Mohsen Moazzami-Gudarzi Tomislav Kremer Valentina Valmacco Plinio Maroni Michal Borkovec Gregor Trefalt

Direct force measurements between negatively charged silica particles in the presence of a like-charged strong polyelectrolyte were carried out with an atomic force microscope. The force profiles can be quantitatively interpreted as a superposition of depletion and double-layer forces. The depletion forces are modeled with a damped oscillatory profile, while the double-layer forces with the mea...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2009
Andrea Vaccaro José Hierrezuelo Michal Skarba Paolo Galletto Jörg Kleimann Michal Borkovec

An adsorbed layer of a cationic polyelectrolyte, poly(diallyldimethyl-ammonium) chloride (PDADMAC) on negatively charged colloidal latex particles was investigated by small-angle neutron scattering (SANS) and dynamic light scattering (DLS). SANS gives a layer thickness of 8 +/- 1 A and a polymer volume fraction of 0.31 +/- 0.05 within the film. DLS gives a somewhat larger thickness of 18 +/- 2 ...

2015
Ralf Zimmermann Carsten Werner Jérôme F. L. Duval Christine Wandrey

The analysis of the charge, structure and molecular interactions of/within polymeric substrates defines an important analytical challenge in materials science. Accordingly, advanced electrokinetic methods and theories have been developed to investigate the charging mechanisms and structure of soft material coatings. In particular, there has been significant progress in the quantitative interpre...

Journal: :ACS applied materials & interfaces 2014
Simone Fabiano Xavier Crispin Magnus Berggren

The dense surface charges expressed by a ferroelectric polymeric thin film induce ion displacement within a polyelectrolyte layer and vice versa. This is because the density of dipoles along the surface of the ferroelectric thin film and its polarization switching time matches that of the (Helmholtz) electric double layers formed at the ferroelectric/polyelectrolyte and polyelectrolyte/semicond...

2014

Despite of few research works on municipal sludge, still there is a lack of actual data. Thus, this work was focused on the conditioning and rheology of fresh activated sludge. The effect of cationic polyelectrolyte has been investigated at different concentrations and pH values in a comparative fashion. Yield stress is presented in all results indicating the minimum stress that necessary to re...

Journal: :The journal of physical chemistry. B 2010
Jens Smiatek Friederike Schmid

We present mesoscopic dissipative particle dynamics-simulations of polyelectrolyte electrophoresis in confined nanogeometries for varying salt concentration and surface slip conditions. Special attention is given to the influence of electroosmotic flow on the migration of the polyelectrolyte. The effective polyelectrolyte mobility is found to depend strongly on the boundary properties, that is,...

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