1995
DOI: 10.1557/jmr.1995.2114
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Abstract: The observation of aerogels submitted to a pressure of mercury indicates that this porous material is compacted and not intruded by the mercury. Consequently, the classical Washburn equation cannot be applied. A relation is established between the pressure P of compaction and the size L of the largest pores. The size of pores is estimated by using the nitrogen adsorption-desorption isotherms analysis and SEM measurements. A relation is found in which P is proportional to L−4 The new relation is applied to merc… Show more

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Cited by 143 publications
(122 citation statements)
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“…This general conclusion is also expected to hold qualitatively for the knee model. In the ambit of Pirard's buckling model, the quantitative relation is P~1/L 4 [4,11]. From the curves of Figure 4, it is clear that the yield pressure of the analyzed materials increases continuously from ET2.5 to ET20 and from RF5.8 to RF7.35, which is in qualitative agreement with the values of l P reported in Table 1.…”
Section: Discussionsupporting
confidence: 81%
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“…This general conclusion is also expected to hold qualitatively for the knee model. In the ambit of Pirard's buckling model, the quantitative relation is P~1/L 4 [4,11]. From the curves of Figure 4, it is clear that the yield pressure of the analyzed materials increases continuously from ET2.5 to ET20 and from RF5.8 to RF7.35, which is in qualitative agreement with the values of l P reported in Table 1.…”
Section: Discussionsupporting
confidence: 81%
“…Indeed, the change in length dL, resulting from an increase of the force dF, increases very rapidly for increasing values of F (see Figure 6a). In another model of the struts, Pirard et al [4,11] neglects the influence of the knees and suggests that the collapse of the pores be related to the buckling of the struts (Figure 6b). This geometrical approximation leads to a well defined value for the force at which buckling occurs F B .…”
Section: Discussionmentioning
confidence: 99%
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