The viscoelasticity of boron nitride nanosheet (BNNS) aerogel has been observed and investigated. It is found that the BNNS aerogel has a high damping ratio (0.2), while it exhibits lightweight and negligible temperature dependence below 180 °C. The creep behavior of the BNNS aerogel markedly demonstrates its strain dependence on stress magnitude and temperature, and can be well simulated by th...

The diffusion of methane confined in nano-porous carbon aerogel with the average pore size 48 Å and porosity 60% was investigated as a function of pressure at T = 298 K using quasi-elastic neutron scattering (QENS). The diffusivity of methane shows a clear effect of confinement: it is about two orders of magnitude lower than in bulk at the same thermodynamic conditions and is close to the diffu...

We have investigated the adsorption and desorption of helium near its liquid-vapor critical point in silica aerogels with porosities between 95% and 98%. We used a capacitive measurement technique which allowed us to probe the helium density inside the aerogel directly, even though the samples were surrounded by bulk helium. The aerogel’s very low thermal conductivity resulted in long equilibra...

Proses pengolahan minyak di Indonesia sangat menguntungkan untuk perekonomian negara. Tetapi disamping itu, terdapat hal yang meyebabkan kerugian yaitu terjadinya tumpahan minyak. Tumpahan bisa diatasi salah satunya dengan menggunakan absorben. Silika aerogel dapat digunakan sebagai Bahan baku utama sintesis silika adalah silika. Pada pasir laut rata-rata mengandung cukup tinggi sebesar 70%. Pe...

Ethylene polymerization was carried out using Phillips chromium catalyst based on silica supports such as silica aerogel, SiO2 (Grace 643), and titanium modified SiO2 (G 643), and the results were compared with other catalysts based on SiO2 (Aldrich), SBA-15(Hex), SBA-15(Sp) and MCM-41. A combination of TGA, DSC, XRD, nitrogen adsorption, SEM, ICP, FTIR and other analyses were used to character...

Abstract In this paper, a method for dimensional stabilization of wood through bulk hydrophobization was investigated using sol–gel process resulting in in-situ formation microporous SiO 2 aerogel. Two different species, beech ( Fagus sylvatica ) and Scots pine Pinus sylvestris were investigated. The incorporation silica aerogel inside the cell wall lumen verified by scanning electron microscop...

Water pollution caused by heavy metal ions has attracted worldwide attention. In this work, gold tailings were used as raw materials and the sol–gel method combined with atmospheric pressure drying to achieve low-cost preparation of a silica aerogel. (3-Aminopropyl) triethoxysilane (APTES), ethylenediaminetetraacetic acid disodium salt (EDTA-2Na), chitosan modify aerogel, which was then an adso...

A new flexible thermal insulation sheet, a composite of silica aerogel with polypropylene (PP) foam, has been developed. Even though large volume ratio (97%) was included, the showed high flexibility. Thermal conductivity 0.016 W/(m?K) at 298 K, which is as low monolith. Silica flaking, problem in practical applications, very this due to skin layers polymer-foam composite. supercritical drying ...

Thermal insulating composites help to reduce the total power consumption in a building by creating a barrier between external and internal environment. Such composites can be used in the roofing tiles or wall panels for exterior surfaces. This study purposes to develop lightweight cement-based composites for thermal insulating applications. Waste materials like silica fume (an industrial by-pro...