Starches of varying chemical structures were esterifi ed with anhydrides, formulated into dry fi lm lubricants with the addition of canola oil, and its friction properties investigated. In the absence of canola, chemically modifi ed starch displayed a very high coeffi cient of friction (COF). Addition of canola resulted in a sharp decrease in COF, which decreased with increasing [canola] until ...

Although 6C3HED ascites lymphosarcoma grows lethally in C3H mice at low tumor cell inoculum, potent immune responses to this tumor have been elicited. It was selected as a model for studying the effectiveness of a number of chemical modifications of the tumor in eliciting immune responses of sufficient potency to protect the animal against a challenging lethal dose of the tumor cells. 6C3HED ce...

PURPOSE To evaluate the bond strength between human dentin and composites, using two light-activated single-bottle total-etch adhesive systems with different pHs combined with chemically activated and light-activated-composites. The tested hypothesis was that the dentin bond strength is not influenced by an adhesive system of low pH, combined with chemically activated or light-activated composi...

Contamination of ecosystems with industrial and population advances has caused numerous problems to the environment human health, as inappropriate disposal effluents contaminated by potentially toxic metals impairs soil groundwater. A low-cost efficient alternative for removal these is biosorption which can be performed through biosorbents such açai pit residue (Euterpe Oleracea Mart.). This wo...

Recent studies of the chemical modification of chitin and chitosan are discussed from the viewpoint of biomedical applications. Special emphasis is placed on the role of individual functional groups in applications of modified chitosan. The modifications discussed here include chitosan attached to sugars, dendrimers, cyclodextrins, crown ethers, and glass beads. Among these derivatives, sugar-m...

In this article, we review our efforts to continuously tune mechanical and thermal properties in multilayer chemically modified graphene (CMG) films. An alteration of the graphene lattice by functional groups, by defects created during reduction, or by defect re-crystallization is used to control CMG mechanical and thermal properties. We attribute a notable increase in Young’s modulus and film ...

Hemp fibers are very interesting natural material for textile and technical applications now. Applying hemp fibers to the apparel sector requires improved quality fibers. In this paper, hemp fibers were modified with sodium hydroxide solutions (5% and 18% w/v), at room and boiling temperature, for different periods of time, and both under tension and slack, in order to partially extract noncell...