Flexible Antibacterial Film Based on Conjugated Polyelectrolyte/Silver Nanocomposites
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In this work, we report a flexible film based on conjugated polyelectrolyte/silver nanocomposites with efficient antibacterial activity. A flexible poly(dimethylsiloxane) film served as a substrate for deposition of nanostructured silver. A light-activated antibacterial agent, based on the cationic conjugated polyelectrolyte poly({9,9-bis[6'-(N,N-trimethylamino)hexyl]-2,7-fluorenyleneethynylene}-alt-co-1,4-(2,5-dimethoxy)phenylene)dibromide (PFEMO) was self-assembled on the negatively charged substrate. By changing the thickness of the poly(l-lysine)/poly(acrylic acid) multilayers between the metal substrate and PFEMO, we obtained concomitant enhancement of PFEMO fluorescence, phosphorescence, and reactive oxygen species generation. These enhancements were induced by surface plasmon resonance effects of the Ag nanoparticles, which overlapped the PFEMO absorption band. Owing to the combination of enhanced bactericidal effects and good flexibility, these films have great potential for use as novel biomaterials for preventing bacterial infections.Polyelectrolyte adsorption
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Abstract A concept to study the influence of molecular parameters in the adsorption of polyelectrolytes is presented. Characteristic for this approach is the use of model surfaces and model polyelectrolytes. The properties of both the surfaces and polyelectrolytes can be varied in a well defined way and over a broad range. First experiments show that the method is able to give structural information about the adsorbed polyelectrolytes. The method is very sensitive, adsorption experiments with polyelectrolyte concentrations in the region of micromoles per litre are possible.
Polyelectrolyte adsorption
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1 Physicochemical aspects of multilayered polyelectrolyte films Multilayered polyelectrolyte films are obtained by alternated depositions on a solid surface of polyanions and polycations~([1]). The driving force for the build-up results from the charge excess which appears on the top of the film after each new polyelectrolyte adsorption. The film top becomes thus positively (respectively negatively) charged when the film is ending by a polycation (respectively polyanion). Various polyelectrolyte systems hav...
Polyelectrolyte adsorption
Biomaterial
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The complexation of a charged hard sphere (macroion) with short and oppositely charged polyelectrolytes was studied by the use of a simple model system. Structural data of the macroion–polyelectrolyte complex and the surrounding solution were obtained by the use of Monte Carlo simulation technique. The number of polyelectrolyte chains as well as the linear charge density and the flexibility of the polyelectrolyte were varied, whereas the properties of the macroion were held constant. In all cases, the macroion and a polyelectrolyte carried an equal number of elementary charges. The simulations showed that for flexible and highly charged polyelectrolytes, a tight complex containing the macroion and one polyelectrolyte was formed independent of the number of polyelectrolytes present. However, for flexible but lower charged polyelectrolytes, a looser macroion–polyelectrolyte complex was established, and a complex involving two polyelectrolytes occurred when two or more polyelectrolytes were available. Finally, for the most rigid polyelectrolyte no complex was formed at all. Generally, an intramolecular contraction of the polyelectrolyte occurred upon complexation with the macroion.
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Polyelectrolyte adsorption
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Polyelectrolyte materials exhibit unique properties and important applications in industry,due to their having the characteristic structure of polymer chain and electrolyte.However,polyelectrolyte would inevitably interact with other substances during their applications,which has remarkable influences on the properties of polyelectrolyte materials.This paper introduced the progress in studies on the interactions between polyelectrolyte and salt,surfactant or opposite charged polyelectrolyte in solution.Moreover,the influences of several factors,such as polyelectrolyte structure,charge density,hydrophobic property and concentration,on the interaction in polyelectrolyte complex systems were discussed.
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The competition between a spherical macroion and a polyelectrolyte in complexation with an oppositely charged flexible polyelectrolyte has been studied by means of Monte Carlo simulations. A simple model system with focus on the electrostatic interactions has been used to investigate under what conditions the macroion in a polyelectrolyte−macroion complex (excess of polyelectrolyte charges) is exchanged with a polyelectrolyte. It is shown that the macroion is released when the charge of the added polyelectrolyte equals or exceeds that of the polyelectrolyte in the complex. The effect of the polyelectrolyte length, flexibility, and linear charge density on the macroion release has been investigated.
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