نتایج جستجو برای: polymer solutions

تعداد نتایج: 427840  

Journal: :محیط شناسی 0
سید نوید سید رضوی دانشگاه تربیت مدرس، دانشجوی کارشناسی ارشد مهندسی عمران، محیط زیست احمد خدادادی دانشگاه تربیت مدرس، دانشیار مهندسی عمران، محیط زیست حسین گنجی دوست دانشگاه تربیت مدرس ، استاد مهندسی عمران ،محیط زیست

soil pollution has become one of the main concerns which because of containing chemical and hazardous materials, alerts the whole environment, and finding solutions to overcome this problem would be very important. many ways have been discovered and examined for soil treatment and one of the most applicable methods is soil washing. in this research, the effect of saponin biosurfactant in crude-...

Journal: :Electrophoresis 1996
A E Barron W M Sunada H W Blanch

Low-viscosity, aqueous solutions of hydrophilic linear polymers have been shown to be useful for the separation of DNA restriction fragments by capillary electrophoresis (CE). However, the choice of polymer type, size, and concentration remains largely empirical, because the mechanism of high-field electrophoretic DNA separations in polymer solutions is not well understood. To assist in elucida...

2011
Janaina Aline Galvão Barros Antonio Jedson Caldeira Brant Luiz Henrique Catalani

PVP, a synthetic polymer and chitosan, a natural polymer are biocompatible and have presented a great variety of interesting properties for cosmetic, biomedical, pharmaceutical and biotechnological applications, Many alternatives to improve the polymer propeties has been made as bleeding polymers, for example. In this work, two different techniques of hydrogel attainment were used: one from mix...

2005
Ariel Michelman-Ribeiro Hacène Boukari Ralph Nossal Ferenc Horkay

In this study, we demonstrate how the diffusion of probe particles in aqueous poly(vinyl alcohol) (PVA) solutions and gels is affected by: (i) the presence of cross-links, (ii) the cross-link density, (iii) the polymer concentration. We apply fluorescence correlation spectroscopy (FCS) to measure the diffusion time of a rhodamine-based fluorescent particle (TAMRA) and TAMRA-labeled dextran in P...

2010
Thomas Pinault Bruno Andrioletti Laurent Bouteiller

Supramolecular polymers are linear chains of low molar mass monomers held together by reversible and directional non-covalent interactions, which can form gels or highly viscous solutions if the self-assembled chains are sufficiently long and rigid. The viscosity of these solutions can be controlled by adding monofunctional compounds, which interact with the chain extremities: chain stoppers. W...

Journal: :Journal of controlled release : official journal of the Controlled Release Society 1999
K Nakamura Y Maitani A M Lowman K Takayama N A Peppas T Nagai

Microparticles of novel, bioadhesive graft copolymers of polymethacrylic acid and polyethylene glycol (P(MAA-g-EG)) were prepared. The aims of this study were to investigate the uptake and release kinetics of budesonide from P(MAA-g-EG) in vitro as well as the pharmacokinetics following nasal administration of the polymer contained budesonide. The loading of budesonide into the pH-sensitive pol...

2012
Michael Appell Michael A. Jackson

The ability of a cyclodextrin-polyurethane polymer to remove ochratoxin A from aqueous solutions was examined by batch rebinding assays. The results from the aqueous binding studies were fit to two parameter models to gain insight into the interaction of ochratoxin A with the nanosponge material. The ochratoxin A sorption data fit well to the heterogeneous Freundlich isotherm model. The polymer...

ژورنال: طب جنوب 2019
Azin , Reza, Najafiasl , Maryam, Osfouri , Shahriyar, Zaeri , Sasan,

Background: Nowadays, in order to preserve the environment and sustainable development, the use of natural and renewable resources is a priority for industries. High performance and specific structure of nano-biocompatible materials has attracted researchers. In this research, alginate polymer, which is generally obtained from marine sources such as algae, was added to polyvinyl alcohol nanofi...

Journal: :Soft matter 2014
Christophe Perge Marc-Antoine Fardin Sébastien Manneville

Homogeneous polymer solutions are well known to exhibit viscoelastic flow instabilities: purely elastic when inertia is negligible and inertio-elastic otherwise. Recently, shear-banding wormlike micelle solutions were also discovered to follow a similar phenomenology. In the shear-banding regime, inertia is usually negligible so only purely elastic flows have been reported. Here, we investigate...

Journal: :The journal of physical chemistry. B 2010
Ferenc Horkay Peter Falus Anne-Marie Hecht Erik Geissler

In solutions of the charged semirigid biopolymer hyaluronic acid in salt-free conditions, the diffusion coefficient D(NSE) measured at high transfer momentum q by neutron spin echo is more than an order of magnitude smaller than that determined by dynamic light scattering, D(DLS). This behavior contrasts with neutral polymer solutions. With increasing salt content, D(DLS) approaches D(NSE), whi...

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