Silica‐Based Sol–Gel Coatings: A Critical Perspective from a Practical Viewpoint

Silanes for Building Protection: A Case Study in Systems Thinking Approach to Materials Science Education

“…On the other hand, waterborne ORMOSIL nanosols make use of a water-alcohol (typically, ethanol or isopropanol) mixture in the presence of a catalytic amount of acid to promote hydrolysis to afford storage-stable nanosol containing plentiful silanols [9].…”

Sol‐Gel Nanocoatings to Functionalize Fibers and Textiles: A Critical Perspective

“…We briefly remind that hybrid organosilica coatings are obtained under very mild conditions in liquid phase via the hydrolytic polycondensation of silicon alkoxides of general formula Si(OR)4 or R'nSi(OR)4-n affording an ORMOSIL (organically modified silicate). [11] In 1999, Böttcher and co-workers reported the preparation and thermal-releasing behavior of silica sol-gel glasses functionalized with high loads of organic liquids. [12] Provided that the boiling points of the hydrophobic oil (the organic liquid) and the solvent (ethanol in most cases) differ sufficiently, and that the sol has a low water content, widely different organic liquids can be easily be incorporated in sol-gel silica by adding the hydrophobic oil to the completely hydrolyzed silica nanosol.…”

“…Usually stabilized against thermodynamically favored aggregation by the addition of alcohol or other cosolvents such as diethylene glycol, it is easily deposited on fabrics forming a lyogel (from the Greek "lyo" for solvent) which dries at relatively low temperature to form a porous, thin (micrometric) homogeneous and dense xerogel film comprised of polymeric organosilica tightly bound to the substrate. [11,5] Sol-gel nanosols, furthermore, are amid the few textile nanotechnology treatments that, besides to fabrics, can be easily applied to fibres by simply running the fibre yarn through a coating bath, followed by quick drying and curing at relatively low temperature.…”

Effect of silica based sols on the optical properties and colour fastness of synthetic indigo dyed denim fabrics

“…The sol-gel technique is an effective, ecofriendly chemical technology where organosilica functional coatings are obtained. 12 Nanosols obtained by the sol-gel technique are formed by hydrolysis of the precursor with water and/or alcohol. The reaction is accelerated by external factors such ethylortosilicate) and different volumes of GPTS ((3-glycidyloxypropyl)trimethoxysilane) as precursors in acidic and alkaline conditions.…”