1996
DOI: 10.1016/0022-3093(95)00499-8
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Irreversible volume shrinkage of silica aerogels under isostatic pressure

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Cited by 36 publications
(22 citation statements)
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“…80 % linear compression and then spring back to more than 95 % of their original size. The bulk modulus of each sample shown in Figure 2a and b was found to be comparable to values for conventional silica aerogels; [26][27][28] however, the Poisson's ratio for MF10-7x was 0.12, which is smaller than the value for typical silica aerogels (0.2). [29] This difference may indicate that the relatively soft and continuous skeletons undergo a substantial deformation, where folding is inward toward the pores.…”
mentioning
confidence: 60%
See 1 more Smart Citation
“…80 % linear compression and then spring back to more than 95 % of their original size. The bulk modulus of each sample shown in Figure 2a and b was found to be comparable to values for conventional silica aerogels; [26][27][28] however, the Poisson's ratio for MF10-7x was 0.12, which is smaller than the value for typical silica aerogels (0.2). [29] This difference may indicate that the relatively soft and continuous skeletons undergo a substantial deformation, where folding is inward toward the pores.…”
mentioning
confidence: 60%
“…For the silica aerogels described above, because silanol groups that are close together will react to form siloxane bonds during a compression test, the gel will shrink and barely recover. [27,28] More critically, silica aerogels will be broken and collapse with small stress because a tetrafunctional, rigid, siloxane network makes silica aerogels extremely brittle. For the present MSQ aerogels, because of 1) the low silanol concentration, 2) repulsive interactions between methyl groups, 3) a highly flexible network that results from lower crosslinking density, and 4) the 3D continuous gel skeletons, the gels barely cracked, shrunk, or collapsed during a compression test.…”
mentioning
confidence: 99%
“…Submitted to an increasing mercury pressure, the samples Pd(MS-dPvM) 2 TE dried, MS-acac-H dried, MS-dPvM and MS-dPvM dried only collapses under mercury pressure, as observed on aerogels [18,20] and xerogels for which the silylated amine ligand/TEOS ratio is particularly high [17,21]. The samples Pd(MSdPvM) 2 TE dried and MS-acac-H dried are shown as examples in Fig.…”
Section: Characterization Of Silylated Acetylacetonate Ligands and Pamentioning
confidence: 93%
“…Above a threshold pressure value, the aerogel shrinkage is no more fully reversible, and a permanent densification is observed (Pirard et al 1995;Duffours et al 1996;Scherer et al 1995b). An example of such a densification is shown in Fig.…”
Section: Densification By Isostatic Pressure Structure and Property Ementioning
confidence: 93%
“…IR measurements performed before and after compaction clearly indicate that this densification is related to a condensation reaction of silanols and an associated creation of water. A sharp increase in the IR absorption band located at 1620 cm À1 corresponding to deformation vibration of free water has indeed been evidenced (Duffours et al 1996).…”
Section: Densification By Isostatic Pressure Structure and Property Ementioning
confidence: 96%