Advanced Opacified Fiber-Reinforced Silica-Based Aerogel Composites for Superinsulation of Exhaust Tubing Systems in Semi-Stationary Motors.

Within this study, monolithic three-dimensional silica aerogel (SA) composite parts with super insulating properties are presented. A generic part based on fiber-reinforced (FR) silica aerogel for thermal insulation of the exhaust tubing system-to keep the exhaust gases as hot as possible to improve the efficiency of the catalyst system-was produced via a sol-gel-based molding process in combination with a supercritical drying using scCO. A thermal conductivity of 16 mW m K was measured via a heat flow meter technique.

Facile Preparation of Nanofibrillar Networks of "Ureido-Chitin" Containing Ureido and Amine as Chelating Functional Groups.

Aerogels of polysaccharides with chelating functions can be useful as supports in many applications because of their hosting properties. This work demonstrates a facile method for the preparation of aerogels of chitosan derivative "ureido-chitin", containing ureido functional groups. The nanofibrillar networks of "ureido-chitin" were produced by the nucleophilic addition of amine groups of chitosan with isocyanic acid prepared in situ.