Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Aerogel densification

Sherer, G.W., Calas, S., and Sempere, R., Densification kinetics and structural evolution during sintering of silica aerogel, J. Non-Crystl. Solids, 240, 118, 1998. [Pg.120]

Hafidi Alaoui A, Woignier T, Phalippou J, Scherer GW (1998) Room Temperature Densification of Aerogel by Isostatic Compression. J Sol Gel Sci Technol 13 365-369... [Pg.42]

Figure 10.16. Illustration of the densification occurring during evaporative drying of polyurethane gels xerogel (left) versus aerogel (right). Both samples come from gels synthesized with pentaerythritol in solution of DMSO and etac with a volume fraction of DMSO >0.3. Diameters of the xerogel and the aerogel are 3 and 5 cm, respectively. Figure 10.16. Illustration of the densification occurring during evaporative drying of polyurethane gels xerogel (left) versus aerogel (right). Both samples come from gels synthesized with pentaerythritol in solution of DMSO and etac with a volume fraction of DMSO >0.3. Diameters of the xerogel and the aerogel are 3 and 5 cm, respectively.
Pirard R, Rigacci A, Marechal JC, Achard P, Quenard D, Pirard JP (2003) Characterization of porous texture of hyperporous polyurethane based xerogels and aerogels by mercury porosimetry using densification equation. Polymer 44 4881 887. [Pg.213]

Lours T, Zarzycki J, Craiewich A, Dos Santos D, Aegerter M, (1987) SAXS and BET studies of aging and densification of silica aerogels. J. Non-Cryst. Solids 95 96 1151-1158... [Pg.246]

The aerogel treated at 500°C practically abides by the condition of one order of magnitude for the ratio /a, corresponding to a D value obtained to standard preparation fotmd for acid-catalyzed classic silica aerogels [82]. Densification studies have shown that dense sono-aerogels can be readily converted into dense glasses, provided sufficient care is... [Pg.437]

Figure 20.22. Left Change of the average size of pores (calculated from SAXS data) of mixed titania-silica aerogels upon first sintering stages. Right simplified model of the evolution of sono-aerogels upon first densification steps. Adapted with permission from [30],... Figure 20.22. Left Change of the average size of pores (calculated from SAXS data) of mixed titania-silica aerogels upon first sintering stages. Right simplified model of the evolution of sono-aerogels upon first densification steps. Adapted with permission from [30],...
Alkemper J, Ratke L, Diefenbach S (1993) ChiU Casting into Aerogels. ScriptaMetallet Mater 29 1495 1500 Emmerling A, Lenhard W, Fricke J, Van de Vorst GAL Densification behaviour of silica aerogels upon isothermal sintering (1997) J Sol-Gel Sci Tech 8 837-842 Brinker J, Scherer GW, Sol-Gel Science. (1990) Academic Press, San Diego... [Pg.788]

Here, C is a constant for material stiffness that needs to be determined experimentally. Figure 5.10b shows the pore size distribution obtained using this equation. It should be noted that densification curves may also be used to determine the bulk compression modulus of silica aerogels (Scherer et ah, 1995b). [Pg.170]

Szaniawska K., Murawski L., Pastuszac R., Walewski M., Fantozzi G. Nitridation and densification of Si02 aerogels. J. Non-Cryst. Solids. 2001 286 58-63 Tillotson T.M., Hrubesh L.W. Transparent ultralow density silica aa-ogels prepared by a two-step process. J. Non-Cryst. Solids. 1992 145 44-50... [Pg.617]

The densification of aerogels under isostatic mercury pressure can be totally irreversible after pressurization-depressurization, as is the case for silica-zirconia aerogels (Pirard, 1995). But most of the time there is a partial reversibihty, which can be relatively important if the sample is maintained at moderate pressure for a short time (Alaoui, 1998). Anyway, the sample volume is smaller after densification, even after a possible relaxation. Therefore, it is possible to study the effect of isostatic pressure on aerogels by characterizing the texture of materials first densified to a known value of isostatic pressure. [Pg.900]

See other pages where Aerogel densification is mentioned: [Pg.974]    [Pg.975]    [Pg.974]    [Pg.975]    [Pg.334]    [Pg.317]    [Pg.171]    [Pg.266]    [Pg.171]    [Pg.142]    [Pg.143]    [Pg.148]    [Pg.25]    [Pg.270]    [Pg.280]    [Pg.346]    [Pg.382]    [Pg.438]    [Pg.439]    [Pg.511]    [Pg.513]    [Pg.619]    [Pg.667]    [Pg.52]    [Pg.1436]    [Pg.447]    [Pg.450]    [Pg.772]    [Pg.371]    [Pg.160]    [Pg.169]    [Pg.61]    [Pg.144]    [Pg.183]    [Pg.616]    [Pg.652]    [Pg.784]    [Pg.896]    [Pg.898]    [Pg.898]   


SEARCH



Aerogel

Aerogel densification thermal

Aerogels

Densification

© 2024 chempedia.info