Silica aerogels Archives - Thermtest Inc.

Effect of the thermal treatment on microstructure and physical properties of low-density and high transparency silica aerogels via acetonitrile supercritical drying

Author(s): Ai Du, Bin Zhou, Guangwu Liu, Jun Shen, Qiujie Yu

Silica aerogels have extremely low thermal conductivities, potentially making them effective thermal insulators. In this study, the thermal conductivities of various samples were explored using the Hot Disk Transient Plane ...

Keywords: High homogeneous density, Hot Disk, Hot Disk TPS 2500, low-density, porous materials, Silica aerogels, Thermal Conductivity, thermal insulation, Thermal treatment, Transient Plane Source, Transient plane source (TPS) method

Assembly of silica aerogels within silica nanofibers: towards a super-insulating flexible hybrid aerogel membrane

Author(s): Bin Ding, Haoru Shan, Hongxia Zheng, Jianyong Yu, Lifang Liu, Xianfeng Wang, Ying Bai

Silica aerogels (SA) are identified as one of the most advanced thermal insulating materials to date, however, their range of applications is limited due to a high sensitivity to moisture ...

Keywords: Hot Disk, Silica aerogels, silica nanofiber, Thermal Conductivity, thermal insulation, Transient Plane Source

Novel lightweight and highly thermally insulative silica aerogel-doped poly (vinyl chloride)-coated fabric composite

Author(s): Dan Åkesson, Mikael Skrifvars, Mohammad J. Taherzadeh, Mostafa Jabbari

In this research silica aerogels were incorporated into PVC fabrics by the research team to improve the overall performance of the fabrics. The aerogel was added in percent fractions of 0, 2, 3, ...

Keywords: density, Hot Disk TPS 2500 S, PVC fabrics, Silica aerogels, thermal insulation, weight

Influence of thermal process on microstructural and physical properties of ambient pressure dried hydrophobic silica aerogel monoliths

Author(s): Ai Du, Bin Zhou, Guangming Wu, Guangwu Liu, Guoqing Zu, Jun Shen, Xing Yuan Ni, Xingyuan Ni

Ambient pressure dried hydrophobic silica aerogel monoliths were prepared via simultaneous solvent exchange and surface modification in order to minimize volume shrinkage and density. At room temperature, the obtained silica ...

Keywords: Apparent Density, BET Method, Brunauer-Emmett-Teller, Brunauer-Emmett-Teller (BET), differential scanning calorimetry, Differential scanning calorimetry (DSC), DSC, Fourier transform infrared spectroscopy (FTIR), Fourier-Transform Infrared Spectroscopy, FTIR, Pore Size Distribution, Pore Size Distribution (PSD), porosity, PSD, Scanning Electron Microscopy, Scanning Electron Microscopy (SEM), SEM, Silica aerogels, specific surface area, TGA, Thermal Conductivity, thermal insulation, Thermo Gravimetric Analyzer, Thermo Gravimetric Analyzer (TGA), Transient Plane Heat Source Method

The influence of gaseous heat conduction to the effective thermal conductivity of nano-porous materials

Author(s): Hu Zhang, Wenquan Tao, Wenzhen Fang, Zengyao Li

The effective thermal conductivity of a commercial silica aerogel is determined at various gas pressures ranging from 0.001 Pa to 1 MPa in order to determine the contribution of gaseous heat conduction ...

Keywords: Silica aerogels, Thermal Conductivity, TPS Method, Transient Plane Source, Transient plane source (TPS) method

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

Ultralow density silica aerogels were formulated by sol-gel process using tetramethyl orthosilicate as the precursor. A supercritical drying step was performed using acetonitrile solvent extraction. These aerogels were found to ...

Keywords: density, Pore Size Distribution, SBET, SEM, Silica aerogels, specific surface area, Thermal Conductivity, thermal insulation, Transient Plane Heat Source Method

Preparation of silica aerogel/polyurethane composites for the application of thermal insulation

Author(s): Ching-Tang Huang, Huang-Shian Tsai, Jia-Ru Chen, Kai-Jay Chang, Ko-Shan Ho, Kuan-Chen Peng, Wan-Fu Lien, Yen-Zen Wang

The authors prepared silica aerogel/polyurethane composites by two different methods for the comparison of the two methods. The objective was to study the thermal insulation and hydrophobic properties of ...

Keywords: BET, Brunauer Emmett and Teller, Brunauer-Emmett-Teller (BET), Bulk Density, Dynamic Contact Angle Analyzer, FESEM, Field Emission Scanning Electron Microscope, Field Emission Scanning Electron Microscope (FESEM), Fourier-Transform Infrared Spectroscopy, Hot Disk Thermal Constants Analyzer, Method, Pore Size Distribution, porosity, Silica aerogels, specific surface area, TEM, thermal insulation, TPS Method, Transient Plane Source, Transient plane source (TPS) method, transmission electron microscope, transmission electron microscope (TEM)

Ambient pressure dried shape-controllable sodium silicate based composite silica aerogel monoliths

Author(s): Teng Huang, Xiaoyong He, Xuan Cheng, Ying Zhang, Zaidong Shao, Ziwei Niu

The preparation process of silica aerogels has commonly involved a dangerous supercritical drying step, so work has been done to eliminate this step. This paper discusses the preparation of composite ...

Keywords: 1H MAS NMR, 29Si MAS NMR, Compressive Test, Nitrogen Adsorption-Desorption Isotherm, Pore Size, pore volume, Scanning Electron Microscope, Scanning electron microscope (SEM), SEM, Silica aerogels, Surface Area, Transient Plane Heat Source Method

Effect of mixing on thermal and mechanical properties of aerogel-PVB composites

Author(s): G. S. Kim, S. H. Hyun

In this paper silica aerogels were synthesized using solvent exchange and surface modification of wet gels from waterglass using IPA/TMCS/n-Hexane solution. The densities, porosities, and specific surface areas ...

Keywords: aerogel-PVB composites, density, hot-pressing, mixing method, Polyvinyl butyral, Polyvinyl butyral (PVB), porositity, PVB, Silica aerogels, solvent exchange, Thermal Conductivity, volume fraction, wet gels

Keyword: Silica aerogels

Effect of the thermal treatment on microstructure and physical properties of low-density and high transparency silica aerogels via acetonitrile supercritical drying

Assembly of silica aerogels within silica nanofibers: towards a super-insulating flexible hybrid aerogel membrane

Novel lightweight and highly thermally insulative silica aerogel-doped poly (vinyl chloride)-coated fabric composite

Influence of thermal process on microstructural and physical properties of ambient pressure dried hydrophobic silica aerogel monoliths

The influence of gaseous heat conduction to the effective thermal conductivity of nano-porous materials

Preparation and Characterization of Ultralow Density Silica Aerogels by Acetonitrile Supercritical Drying

Preparation of silica aerogel/polyurethane composites for the application of thermal insulation

Ambient pressure dried shape-controllable sodium silicate based composite silica aerogel monoliths

Effect of mixing on thermal and mechanical properties of aerogel-PVB composites

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