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    Synthesis of organotrimethoxy silane modified alumino-siloxane hybrid gels: Physico-chemical properties evaluation and design of superhydrophobic smart powders and coatings

    Year: 2022

    Journal: Mater. Chem. Phys., Volume 278, FEB 15

    Authors: Linsha, Vazhayal; Mahesh, Kallyadan Veettil; Anas, Shereef; Ananthakumar, Solaiappan; Prabhakaran, Kuttan

    Organizations: University Grants Commission (UGC) , Government of India; KSCSTE [649/2019/KSCSTE]

    Keywords: Sol-gel synthesis; Organotrimethoxy silanes; Organic -inorganic hybrids; Superhydrophobicity; Alumino-siloxane; Water repellence

    Herein, we investigated the effect of a series of mono-substituted organotrimethoxy silanes (RTMS) on the sol-gel polymerization of hydrolyzed alumina sol (AIP) into a hybrid alumino-siloxane (AIP-RTMS) gels. RTMS with different organofunctional groups (R = methyl, vinyl, phenyl, octyl, aminopropyl, and glycidoxypropyl) were used for this purpose. The study revealed that the non-hydrolysable organo-functional groups of RTMS coprecursors strongly influence the gelation behaviour of AIP-RTMS hybrid gels. Evaporative and freeze drying methods were employed to obtain AIP-RTMS xerogels and cryogels, respectively. The remarkable variation observed in textural and morphological features of AIP-RTMS cryogels enabled them to possess greater surface area and pore-volume, and very low density than their xerogel counterpart. The study revealed that, the fissured arrangement of loosely layered morphology and non-hydrolyzable functional groups of RTMS in cryogels have a considerable influence on the surface wettability. Interestingly, a shift in hydrophobicity to superhydrophobicity was observed in AIP-VTMS and AIP-MTMS cryogels when compared to their xerogel counterparts. An excellent water repelling ability is also demonstrated using a fabric coated with AIP-VTMS hybrid. Owing to these beneficial properties, alumino-siloxane hybrids developed in this study have strong potential for the preparation of smart aerogels and coatings suitable in purification/separation applications.
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