Chitosan Bio‐Based Organic–Inorganic Hybrid Aerogel Microspheres

Abstract

Recently, organic-inorganic hybrid materials have attracted tremendous attention thanks to their outstanding properties, their efficiency, versatility and their promising applications in a broad range of areas at the interface of chemistry and biology. This article deals with a new family of surface-reactive organic-inorganic hybrid materials built from chitosan microspheres. The gelation of chitosan (a renewable amino carbohydrate obtained by deacetylation of chitin) by pH inversion affords highly dispersed fibrillar networks shaped as self-standing microspheres. Nanocasting of sol-gel processable monomeric alkoxides inside these natural hydrocolloids and their subsequent CO(2) supercritical drying provide high-surface-area organic-inorganic hybrid materials. Examples including chitosan-SiO(2), chitosan-TiO(2), chitosan-redox-clusters and chitosan-clay-aerogel microspheres are described and discussed on the basis of their textural and structural properties, thermal and chemical stability and their performance in catalysis and adsorption.

Preparation and properties of polycarbonate nanocomposites using attapulgite grafted poly(methyl methacrylate) as a potential nanofiller

“…[1][2][3] According to previous researches, 3-5 wt % loading of nanoclay improves the mechanical and thermal properties of the polymer matrix to the same content as 30-50 wt % of other fillers under a homogeneous dispersion. 4,5 However, to achieve a homogeneous dispersion, proper surface modification of nano-clay is essential, and followed by melt blending or in situ polymerization process to improve the interfacial interaction between clay and polymer matrix.…”

Flexible and Cellulose-based Organic Electronics

“…These structures have in some cases been further functionalized with other materials for use in various applications. [29,[135][136] However, non-polymeric materials such as carbon and silica are also often used. [31] In the literature, aerogels have been used in a wide range of applications such as: biomedical application, such as for drug delivery and tissue regeneration [31] , water cleaning and oil absorption [137][138] , thermal insulation [30,[139][140] and supercapacitors [32,[141][142][143] .…”

A Facile and Effective Approach to Fabricate Chitosan/Hydroxyapatite Nanocomposite Coating on the Surface of Wood from Chinese Glossy Privet

“…In addition, pH might impact the hydrophilic and hydrophobic interaction and induce spontaneous entanglement of the polymeric network to form the lump. 28 …”