This study investigates the feasibility of using ethylene oxide (EO) chain adsorption to determine the surface area of smectite in water. Experimental results indicate that high-molecular-weight poly(ethylene oxide) (PEO) should be used to provide reasonable estimations for monolayer capacity of PEO on smectite. The surface areas of smectites in water are calculated from the monolayer capacity ...

In this work, polymer composite materials based on linear low-density polyethylene and iron oxide nanoparticles were obtained. Nanoparticles of synthesized in plasma discharge under ultrasonic cavitation. When preparing materials, the concentration was varied from 0.5 to 20 wt. %. Measurements elastic modulus as well dynamic tests revealed strong dependence mechanic properties nanoparticle conc...

background: ultrasmallsuperparamagnetic iron oxide (uspio) nanoparticles are used as blood pool contrast agent for magnetic resonance angiography and perfusion imaging. our aim in this study was to investigate the effect of the two coating types of iron oxide nanoparticles on the relationship between nanoparticles concentration and signal intensity (si) in t1-weighted mr images.   methods : dif...

objective(s):iron oxide nanoparticles have found prevalent applications in various fields including drug delivery, cell separation and as contrast agents. super paramagnetic iron oxide (spio) nanoparticles allow researchers and clinicians to enhance the tissue contrast of an area of interest by increasing the relaxation rate of water. in this study, we evaluate the dependency of hydrodynamic si...

A progesterone analog has been covalently linked via an amide bond to polyethylene oxide (molecular weight, 20,000). This macromolecular steroid molecule displays the biological activity of progesterone in inducing meiotic maturation when incubated with Xenopus laevis oocytes (stage VI) in vitro. Its efficiency (half-maximum effective concentration, 30 muM) is approximately 10 times lower than ...

Submitted for the MAR13 Meeting of The American Physical Society Control ion transport by tuning the crystalline morphology in polyethylene oxide-based solid electrolyte SHAN CHENG, CHRISTOPHER LI, DERRICK SMITH, Drexel University — The crystalline structure of polyethylene oxide (PEO) strongly affects the ion transport in solid PEO-Lithium salt electrolytes. Four possible phases can exist in a...

The thermal stability of polyethylene oxide (PEO) in sustained release tablets prepared by hot-melt extrusion was investigated. The weight average molecular weight of the polymer was studied using gel permeation chromatography. The chemical stability of PEO was found to be dependent on both the storage and processing temperature, and the molecular weight of the polymer. Storage of the polymer a...

An important requirement for endodontic paste with antibiotics placed in direct contact with living tissues is biocompatibility. The aim of this study was to evaluate the paste biocompatibility prepared with zinc oxide (1.25mg), tetracycline (8mg) and thiamphenicol (26.67mg). The paste and its components were implanted separately through polyethylene sterile tubes of 10mm in length and 1.3mm in...