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Keyword: Aerogels

Total Papers Found: 13

Systematic studies of tannin–formaldehyde aerogels: preparation and properties

Author(s): Alain Celzard, Andrzej Szczurek, Antonio Pizzi, Gisele Amaral-Labat, Vanessa Fierro

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. ...

Keywords: Aerogels, BET surface area, BET Surface Area Analysis, Formaldehyde, Insulators, pH, phase diagram, porosity, resin, Tannins, Thermal Conductivity

Engineering thermal and mechanical properties of flexible fiber-reinforced aerogel composites

Author(s): Anmin Cao, Huijun Wu, Moran Wang, Shuai Yin, Yundan Liao, Yunfei Ding

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 Method

Thermoelectric behavior of aerogels based on graphene and multi-walled carbon nanotube nanocomposites

Author(s): Aiping Zhang, Jinghong Zhao, Jinrong Wu, Lijuan Zhao, Quan Li, Xijing Sun, Zhouyue Lei

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 Diffraction

Investigation of transmittance and thermal conductivity properties of silica gels for application as transparent heat insulation materials

Author(s): Christos G. Aneziris, Friederike Klenert, Jens Fruhstorfer

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), Xerogels

Reduction of shrinkage and brittleness for resorcinol-formaldehyde aerogels by means of a pH-controlled sol-gel process

Author(s): Lorenz Ratke, Marina Schwan, Rene Tannert

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) method

One-pot synthesis, characterization and properties of acid-catalyzed resorcinol/formaldehyde cross-linked silica aerogels and their conversion to hierarchical porous carbon monoliths

Author(s): Ai Du, Bin Zhou, Guangming Wu, Jun Shen, Ke Chen, Xiurong Zhu, Zhihao Bao, Zhihua Zhang

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 Modulus

Effective structure of aerogels and decomposed contributions of its thermal conductivity

Author(s): Dan Dan, Hu Zhang, Wen-Quan Tao

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) method

New tannin-lignin aerogels

Author(s): A. Szczurek, Alain Celzard, Antonio Pizzi, B. N. Kuznetsov, G. Amaral-Labat, L. I. Grishechko, V. Fierro

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) method

Influence of environmental factors on the adsorption capacity and thermal conductivity of silica nano-porous materials

Author(s): Hu Zhang, Ming-Jia Li, Wei Gu, Wen-Quan Tao, Wen-Zhen Fang, Zeng-Yao Li

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 capacity

Preparation and characterization of ultralow density silica aerogels by acetonitrile supercritical drying

Author(s): Bin Zhou, Guang Wu Liu, Qiu Jie Yu, Xing Yuan Ni

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) method

Keyword: Aerogels

Systematic studies of tannin–formaldehyde aerogels: preparation and properties

Engineering thermal and mechanical properties of flexible fiber-reinforced aerogel composites

Thermoelectric behavior of aerogels based on graphene and multi-walled carbon nanotube nanocomposites

Investigation of transmittance and thermal conductivity properties of silica gels for application as transparent heat insulation materials

Reduction of shrinkage and brittleness for resorcinol-formaldehyde aerogels by means of a pH-controlled sol-gel process

One-pot synthesis, characterization and properties of acid-catalyzed resorcinol/formaldehyde cross-linked silica aerogels and their conversion to hierarchical porous carbon monoliths

Effective structure of aerogels and decomposed contributions of its thermal conductivity

New tannin-lignin aerogels

Influence of environmental factors on the adsorption capacity and thermal conductivity of silica nano-porous materials

Preparation and characterization of ultralow density silica aerogels by acetonitrile supercritical drying

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