Silica-aerogel-powders “jammed” polyimide aerogels with excellent hydrophobicity and conversion to ultra-light polyimide aerogel

Abstract

In this paper, SAp play a role as the shrinkage inhibiter to fabricate the SAp “jammed” polyimide gels.

Reduced Graphene Oxide (rGO)/ZrO2 Reinforced Polyimide Nanocomposite Aerogels with Enhanced Properties: A Synergistic Effect of the Nanofillers

“…ZrO 2 is a weak acid oxide and then has better affinity to triethylamine salt of PAA, leading to stable existence and better dispersed state in PAS aqueous solution. Other groups′ research has reported that addition of inorganic nanofillers can offset shrinkage during the formation of PI aerogels . Here we found shrinkage of PI/(rGO+ZrO 2 ) aerogel is reduced to 19% drastically under the synergistic effect of GO and ZrO 2 .…”

Cast-In-Situ, Large-Sized Monolithic Silica Xerogel Prepared in Aqueous System

“…Their gas thermal conductivity is thus also largely suppressed. The thermal conductivity of xerogels at an ambient temperature is therefore mainly dependent on the solid thermal conductivity [ 31 ]. For the aerogels whose density is higher than 150 mg·cm −3 , their thermal conductivity mainly depends on the solid thermal conductivity and increases with the increasing density [ 2 ].…”

Efficient preparation of crack-free, low-density and transparent polymethylsilsesquioxane aerogels via ambient pressure drying and surface modification

“…The Young's modulus of each sample was evaluated as the initial linear slope of the stress-strain curve. 26,42 The Young's moduli of non-modied, Modied-4, Modied-5, Modied-6 and Modied-7 were 1.5, 1.07, 0.49, 0.31 and 0.12 MPa, respectively. In this case, the modulus was mainly affect by the density.…”

“…Compression tests were conducted on a CMT 5105 universal materials testing machine under room conditions with a constant compression speed at 10% of the sample length per minute. 26 To assess the molecular-level structure of the obtained PMSQ aerogel, 29 Si MAS NMR experiments were performed on an Agilent 600 DD2 spectrometer at a resonance frequency of 119.13 MHz. 29 Si NMR spectra were recorded with spinning rate of 7 kHz with a 6 mm probe at room temperature.…”