Dominant factors for moisture resistance of sol–gel silica coatings: Surface chemical composition or inner microstructure?

Zhang, Chen; Wang, Hongqiang; Shen, Jun; Wang, Xiaodong

doi:10.1016/j.apsusc.2023.158616

Cited by 8 publications

(1 citation statement)

References 43 publications

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“…As shown in Figure 5a, all the PVPMS/PDMS copolymer aerogels are hydrophobic and the highest WCA is 151°for VD-5−9-S due to the abundant hydrophobic −CH 3 groups in the skeleton structure. 19,30,47 The WCA of aerogel increases with the increase of the molar ratio of DMDMS to VMDMS. This is because the DMDMS molecule contains more methyl groups than the VMDMS molecule, and aerogels prepared from coprecursors with more DMDMS content possess more hydrophobic methyl groups, resulting in higher hydrophobicity.…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Highly Flexible Triple-Network Polyorganosiloxane-Based Aerogels for Thermal Insulation, Oil–Water Separation, and Strain/Pressure Sensing

Wang,

Xi,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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Polyvinylpolymethylsiloxane (PVPMS)/polydimethylsiloxane (PDMS) copolymer aerogels were synthesized via consecutive radical polymerization and cohydrolytic polycondensation of vinylmethyldimethoxysilane and dimethyldimethoxysilane, followed by supercritical drying or ambient pressure drying. The resultant PVPMS/PDMS copolymer aerogels exhibit a highly porous, tunable triple-network structure consisting of interlinked hydrocarbon polymers, PVPMS and PDMS. These aerogels display superhydrophobicity (151°), low density (109 mg cm −3 ), low thermal conductivity (29.8 mW m −1 K −1 ), and adjustable pore structure. The combination of good machinability, low thermal conductivity, excellent compressive elasticity and bending flexibility, and efficient organic solvent adsorption gives these aerogels broad application prospects in thermal insulation and oil−water separation. In addition, PVPMS/PDMS/carbon nanotube (CNT) composite aerogels were obtained by incorporating the conductive CNTs, followed by vacuum drying. The resultant PVPMS/PDMS/CNT composite aerogel exhibits high sensitivity with a broad pressure sensing range in strain and pressure sensing applications.

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Section: Resultsmentioning

confidence: 99%

Superhydrophobic Highly Flexible Triple-Network Polyorganosiloxane-Based Aerogels for Thermal Insulation, Oil–Water Separation, and Strain/Pressure Sensing

Wang,

Xi,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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Strong and Ultrahigh Temperature‐Resistant Metal Oxide Nanobelt Aerogels

Wang,

Zhang

et al. 2024

Adv Funct Materials

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Metal oxide aerogels, inorganic cousins of the highly commercialized metalloid oxide silica aerogels, exhibit distinct properties specific to each type. Nevertheless, they share a common challenge with silica aerogels—brittleness and low mechanical strength due to their particulate necklace‐like structure. In contrast, polymer aerogels often boast significantly enhanced mechanical properties thanks to their nanofibrillated networks. To enhance the mechanical properties of metal oxide aerogels, the metal oxide formation with a polymeric nanostructure is micro‐templated. This method transforms the necklace‐like particulate microstructure of metal oxide aerogels (e.g., Al2O3 Cr2O3, and Fe2O3) into a polymer‐like nanobelt structure. Remarkably, even after removing the polymer template through calcination at 600 °C, the nanobelt structure remains intact. These metal oxide nanobelt (MNB) aerogels exhibit exceptional compressibility while retaining their mesoporous structure. As a demonstration, the resulting Al‐MNB aerogel can withstand compression up to 80% strain without fracturing while preserving its porous nanobelt structure and a high specific surface area of 228 m2 g−1 and a pore volume of 0.7 cm3 g−1 after heat treatment at 1300 °C. This work introduces an innovative strategy for creating a distinctive polymer‐like nanobelt microstructure, paving the way for novel applications of metal oxide aerogels with unique structures and enhanced performance.

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Simulation of hybrid air-cooled and liquid-cooled systems for optimal lithium-ion battery performance and condensation prevention in high-humidity environments

Zhang,

Yuan,

Kong

et al. 2024

Applied Thermal Engineering

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Dominant factors for moisture resistance of sol–gel silica coatings: Surface chemical composition or inner microstructure?

Cited by 8 publications

References 43 publications

Superhydrophobic Highly Flexible Triple-Network Polyorganosiloxane-Based Aerogels for Thermal Insulation, Oil–Water Separation, and Strain/Pressure Sensing

Superhydrophobic Highly Flexible Triple-Network Polyorganosiloxane-Based Aerogels for Thermal Insulation, Oil–Water Separation, and Strain/Pressure Sensing

Strong and Ultrahigh Temperature‐Resistant Metal Oxide Nanobelt Aerogels

Simulation of hybrid air-cooled and liquid-cooled systems for optimal lithium-ion battery performance and condensation prevention in high-humidity environments

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