منابع مشابه
Characterization of Mechanical Properties of Silica Aerogels
Silica aerogels are nanoporous ultralight new materials with extraordinary material properties. In this study, the mechanical properties of silica aerogels, e.g. Young’s modulus, Poisson’s ratio and constitutive relation, are investigated using Molecular Dynamics (MD) simulations and theoretical analysis. In molecular dynamics simulations, an improved process of negative pressure rupturing meth...
متن کاملIntegration of Silica Aerogels in Microfluidic Chips
This paper reports a method to integrate silica aerogels monolithically in microfluidic chips. Silica Aerogel is a highly porous bulk material. The gel was synthesized from tetraethyl orthosilicate by a sol-gel process. Polyethylene glycol and an extended aging period were used to strengthen the matrix minimizing gel shrinkage. This technique allows alcogel structures with high strength and sti...
متن کاملCalorimetric study of phase transitions for octylphenylthiolpentyloxybenzoate in silica aerogels
An a.c. calorimetric study has been carried out on octylphenylthiolpentyloxybenzoate (8ÂS5) in three silica aerogels with mass densities r=0 0́8, 0 1́7 and 0 3́6 g cm Õ 3 . Results for the least porous aerogel (r=0 3́6) are completely consistent with those reported previously for 8CB in the same aerogel. Freezing of 8ÂS5 damaged the more porous r=0 0́8 and 0 1́7 aerogels by creating internal voids an...
متن کاملWhat Factors Control the Structure of Silica Aerogels
By manipulating polymerization conditions in solution precursors, it is possible to control the structure of silica aerogels. Porosity varies from grain-like to polymer-like. When produced from alkoxides, pH is the dominant factor that determines structure. Under strongly basic conditions (pH > 12) compact colloidal particles are observed. In the range pH = 8-12, particles of varying surface ro...
متن کاملSilica Aerogels Doped with MWCNT, Graphene, MoS2, and WS2
Silica aerogels are among the most easily produced types of aerogels due to the availability of required materials, the cheapness of required materials such as carbon dioxide, ethanol, and tetraethyl orthosilicate, and the relatively simple sol-gel chemistry. Using silica aerogels as skeletons, nanomaterials were easily and effectively structured in three dimensions. The aerogels were doped wit...
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ژورنال
عنوان ژورنال: Journal of Non-Crystalline Solids
سال: 1987
ISSN: 0022-3093
DOI: 10.1016/s0022-3093(87)80729-9