A variety of tannin-formaldehyde aerogels were produced in order to examine the effects of pH and dilution during their manufacture. The authors produced a phase diagram that could describe them. ...Read More
The authors present a method of fiber-reinforced aerogel composites by impregnation of four layers of aligned glass fibers into silica sol layer-by-layer. The effect of different fiber alignments, as well ...
Keywords: Aerogels, Analysis, Bulk Density, Compression Tests, Droplet Scanning Analysis, Droplet Scanning Analysis (DSA), DSA, Fast Fourier Transform, Fast Fourier Transform (FFT) Analysis, FFT, glass, Scanning Electron Microscopy, Scanning Electron Microscopy (SEM), SEM, Silica Aerogel Composites, Surface Hydrophobicity, Thermal Conductivity, Thermostability, Transient Plane Heat Source MethodRead More
Thermoelectric behavior of aerogels based on graphene and multi-walled carbon nanotube nanocomposites
This paper proposes conducting carbon aerogels, composed of graphene and multi-walled carbon nanotubes, as an option for a thermoelectric material. The researchers found that this combination of materials increased the ...
Keywords: Aerogels, atomic force microscopy, Carbon nanotubes, CNTs, Electrical Conductivity, Figure of Merit, graphene, multi-walled, nanocomposites, Seebeck coefficient, Thermal Conductivity, Thermoelectric, X-ray DiffractionRead More
Investigation of transmittance and thermal conductivity properties of silica gels for application as transparent heat insulation materials
In this article the effectiveness of silica aerogels as a transparent heat insulation material (TIM) is studied. They are a good candidate for this application as the amount of energy ...
Keywords: Aerogels, hydrothermal treatment, Silica, silica gels, Thermal Conductivity, thermal insulation, TIM, transparent heat insulation materials, transparent heat insulation materials (TIM), XerogelsRead More
Reduction of shrinkage and brittleness for resorcinol-formaldehyde aerogels by means of a pH-controlled sol-gel process
This article investigates how the thermal conductivity of a resorcinol-formaldehyde aerogels varies with increasing resorcinol (R) to water (W) ratios. The thermal conductivity was measured using the Hot disk transient ...
Keywords: Aerogels, composite materials, density, gel shrinkage, Pekala, pH, polymerization, porosity, resorcinol-formaldehyde aerogels, Sol-gel process, superinsulating materials, Surface Area, Thermal Conductivity, Transient plane source (TPS), Transient plane source (TPS) methodRead More
One-pot synthesis, characterization and properties of acid-catalyzed resorcinol/formaldehyde cross-linked silica aerogels and their conversion to hierarchical porous carbon monoliths
Aerogels are ultra-light, insulative, porous materials that have a wide variety of applications. The aim of this study was to synthesize resorcinol/formaldehyde (RF) cross-linked silica aerogels in one pot ...
Keywords: Acid-catalyzed, Aerogels, Carbon monoliths, cross linking, density, Formaldehyde, Gelation time, glass, Glass wool, Hydrogen fluoride treatment, mechanical properties, Porous Structures, Resorcinol, Silica, Silicon dioxide (SiO2), strength, Temperature, Thermal Conductivity, Transient plane source (TPS), Transient plane source (TPS) method, Young's ModulusRead More
Aerogels are nano-porous materials with impressive thermal insulation properties. This study uses a new theoretical model to predict the effective thermal conductivity of aerogels based on gas and solid conduction, ...
Keywords: Aerogels, Decomposition method, Gas pressure, Nanoparticles, Nanoporous materials, Solids, Spherical hollow cube model, Temperature, Thermal Conductivity, Thermal radiation, Transient plane source (TPS), Transient plane source (TPS) methodRead More
Tannin and lignin are organic materials that are more cost-effective than synthetic, non-renewable phenolic compounds. In this paper, tannin-lignin-formaldehyde (TLF) composites were used to synthesize thermally insulative mesoporous aerogels. A ...
Keywords: Aerogels, Electron Microscopy, Formaldehyde, Hydrogel, Lignin, Mechanical resistance, Organic aerogels, pH, Pore Size, Porous, Solids, Supercritical CO2 drying, Tannin, Thermal Conductivity, Transient plane source (TPS), Transient plane source (TPS) methodRead More
Influence of environmental factors on the adsorption capacity and thermal conductivity of silica nano-porous materials
Aerogels have a wide range of properties that make them effective thermal insulators. However, these properties are lost when the materials absorb too much water. The goal of this experiment ...
Keywords: Adsorption saturation capacity, Aerogels, Amorphous, Cell structure, composites, environmental, Exothermic, Humidity, Pore Size, porosity, Scanning Electron Microscopy (SEM), Silica nanoporous materials, Temperature, Thermal Conductivity, thermal insulation, Thermal Resistance, Water vapor adsorption capacityRead More
Preparation and characterization of ultralow density silica aerogels by acetonitrile supercritical drying
In this study, ultralow density silica aerogels were synthesized and their thermal conductivities were tested to determine how supercritical drying affected the samples. A Hot-Disk TPS2500 measured the thermal conductivity ...
Keywords: Acetonitrile solvent extraction, Aerogels, density, morphology, pcms, phase change materials, Scanning electron microscope (SEM), Silica, Sol-gel process, Supercritical Drying, Surface Area, Tetramethyl orthosilicate (TMOS), Thermal Conductivity, thermal insulation, thermal transport properties, Transient plane source (TPS), Transient plane source (TPS) methodRead More