G. Lawes,1 S. C. J. Kingsley,1,* N. Mulders,2 and J. M. Parpia1 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 2Department of Physics and Astronomy, University of Delaware, Newark, Delaware (Received 15 December 1999) We have investigated the superfluid transition of 3He in different samples of silica aerogel. By comparing new measurements on a 99.5% sample ...

Introduction: The hypervelocity impacts of comet particles at 6.1 km/s have left tracks in the Stardust aerogel. The terminal particles are usually coarse grained minerals but abundant material is also present along the track walls as illustrated by synchrotron X-rays fluorescence spectroscopy [1]. This configuration suggests that the Wild 2 particles are made of poorly cohesive assemblages tha...

Silica aerogel possesses an ultra-low thermal conductivity by virtue of its nano-structure. Owing to the fragility monolithic aerogel, development and production aerogel-based insulation materials involve incorporation granular with other form composite materials. In present study, application silica-aerogel-incorporated cement paste as render on roof-top surface is coupled installation a novel...

A torsional oscillator has been used to study the flow of liquid 4He through silica aerogel. The tortuosity and dissipation of the flow in the fractal aerogel environment has been measured, for both capillary condensed films and a fully saturated cell. The scaling of tortuosity as a function of filling fraction has been investigated. We compare the results of our 88%-porous aerogel to a 92%-por...

We present the results of high magnetic field experiments in pure $^{3}\mathrm{He}$ (in absence $^{4}\mathrm{He}$ coverage) nematic aerogel. In this case aerogel strands are covered with few atomic layers solid paramagnetic $^{3}\mathrm{He}$, which enables spin-exchange mechanism for quasiparticles scattering. Our earlier NMR showed that low fields, instead polar phase, $A$ phase is expected to...

Due to high surface area, low density, open pore structure and excellent insulation properties aerogels were intensively investigated in the past decades for diverse range of applications. The state of the art of aerogel production by supercritical drying is to produce monolithic aerogel, where the sol is aged in molds and dried by extraction with supercritical CO2. Aerogels in form of spherica...

Polymer aerogels are a promising, non-brittle alternative to silica aerogel, but limited by their very poor high-temperature stability. Polyimide is widely known for its high heat-resistance, however, degree of volume shrinkage common polyimide after exposure temperatures above 200 °C. Here, we present the aerogel-in-aerogel composites that comprise aerogel grains with nanoparticulate microstru...

In the present study, silica aerogel- egg shell was synthesized for dye removal of colored wastewater. The nano composite structure was characterized by Fourier transform infrared spectra FTIR and scanning electron microscope SEM.The ability of nano composite absorption was assessed for removal basic violet 16BV16 dye from aqueous solutions and was compared with two other adsorbents such as egg...

• Comprehensive review of all approaches used to assemble aerogel-fiber materials. “In situ sol-gel” and “via pre-formed aerogel” are described evaluated. Enhanced mechanical/physical properties obtained while keeping low thermal conductivity. An overview the market future research trends identified. Silica aerogels have a unique structure that makes them promising materials for variable applic...

Statistical models using multiple linear regression are some of the most widely used methods to study the influence of independent variables in a given phenomenon. This study's objective is to understand the influence of the various components of aerogel-based renders on their thermal and mechanical performance, namely cement (three types), fly ash, aerial lime, silica sand, expanded clay, type...