specific surface area Archives

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

Synthesis and characterization of silica aerogel and its composite materials

Author(s): Liu Guangwu, LiuYangang, Ni Xingyuan

Composite silica aerogels were prepared using sodium silicate and ceramics fibers. The thermal conductivities of these composites were investigated to determine how effective they would be as thermal insulation. As ...

Keywords: ceramics, density, pore volume, Silica Aerogel Composite, specific surface area, Thermal Conductivity, thermal insulation, Transient Plane Heat Source 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

New biobased foams from wood byproducts

Author(s): Claudia Mitterer, Fatima Charrier-El Bouhtoury, Helene Carre, Herve Deleuze, Juliette Merle, Marc Birot

Biobased foams derived from lignins and tanins were produced by mechanical frothing and curing. The obtained foams did not crack after drying. The foams were found to be good thermal ...

Keywords: Biobased Foams, Compression Testing, Lignin, Mercury Intrusion Porosimetry, Scanning Electron Microscopy, Scanning Electron Microscopy (SEM), SEM, specific surface area, Tannins, Thermal Conductivity, thermal insulation, transient plane 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)

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

Author(s): A. Cipitria, I. O. Golosnoy, L. Xie, M. R. Dorfman, S. Paul, T. W. Clyne

Yttria-stabilized zirconia (YSZ) powders containing varying amounts of SiO2 and Al2O3 impurities were plasma sprayed onto metallic substrates and subsequently investigated. The authors were interested in how the impurities ...

Keywords: APS, Atmospheric Plasma Spraying, Atmospheric Plasma Spraying (APS), ceramics, Coatings, Dilatometer, Hot Disk TPS Technique, Linear Contraction, Mercury Porosimetry, Plasma-Sprayed Ceramic Coatings, Pore Size, porosity, Powders, Scanning Electron Microscopy, Scanning Electron Microscopy (SEM), SEM, Sintering Rates, specific surface area, Thermal Barrier Coatings, Thermal Conductivity, X-ray Diffraction, X-ray diffraction (XRD), XRD, Young's Modulus, YSZ, Yttria-Stabilized Zirconia, Yttria-Stabilized Zirconia (YSZ) Powders

Ultrathin BN nanosheets with zigzag edge: one-step chemical synthesis, applications in wastewater treatment and preparation of highly thermal-conductive BN-polymer composites

Author(s): Deliang Cui, Gang Lian, Haibin Si, Jun Wang, Qilong Wang, Shunjie Zhang, Xiao Zhang

Ultrathin boron nitride nanosheets (BNNSs) were prepared at 300°C by a new variable-pressure one-step synthesis. An increase in pressure during the synthesis results in a decreased thickness for the nanosheets, ...

Keywords: Adsorption Capacity, BN, BNNSs, boron nitride, composites, Hot Disk Thermal Constants Analyzer, Polymer composites, specific surface area, Thermal Conductivity, thickness, Ultrathin BN Nanosheets, Ultrathin BN Nanosheets (BNNSs)

Thermal Conductivity of Carbon Nanofibre-Polypropylene Composite Foams

Author(s): E. Solorzano, J. A. de Saja, J. I. Velasco, M. A. Rodriguez-Perez, M. Antunes, Miguel-Ángel Rodríguez-Pérez, V. Realinho

The present study look at the creation of unfilled and carbon nanofibre (CNF)-filled polypropylene (PP) foams, and their subsequent testing of thermal and mechanical properties. The testing of thermal ...

Keywords: Carbon Nanofibers, Carbon nanofibers (CNFs), CNF, Compression-Moulding, differential scanning calorimetry, Differential scanning calorimetry (DSC), DSC, Electrical Conductivity, Fillers, Foam Density, High Performance, Nanofibre Volume Fraction, Polymer composites, polypropylene, Scanning Electron Microscopy, Scanning Electron Microscopy (SEM), SEM, specific surface area, TEM, Thermal Conductivity, TPS Technique, Transient Plane Source, Transient plane source (TPS) method, Transmission electron microscopy, Transmission electron microscopy (TEM)

A New Class of Opacified Monolithic Aerogels of Ultralow High-Temperature Thermal Conductivities

Author(s): Shih-Yuan Lu, Te-Yu Wei, Yu-Cheng Chang

The main objective of this research project was to create a material with a very low thermal conductivity at high temperatures, for the conservation of energy in high temperature systems. ...

Keywords: Accelerated-Gelation Sol-Gel Process, Barrett-Joyner-Halenda, Barrett-Joyner-Halenda (BJH) pore volume, BET, BJH, Brunauer-Emmett-Teller, Brunauer-Emmett-Teller (BET), Carbon Nanofibers, density, Extinction Coefficients, FE-SEM, Fourier-Transform Infrared Spectroscopy, Fourier-Transform Infrared Spectroscopy (FT-IR), FT-IR, High Temperature, Opacified Monolithic Aerogels, pore volume, porosity, Scanning Electron Microscopy, Scanning Electron Microscopy (FE-SEM), specific surface area, Supercritical Drying, TGA, Thermal Conductivity, thermal insulation, Thermogravimetric Analysis, Thermogravimetric analysis (TGA), TPS Technique, Transient Plane Source, Transient plane source (TPS) method

Keyword: specific surface area

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

Synthesis and characterization of silica aerogel and its composite materials

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

New biobased foams from wood byproducts

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

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

Ultrathin BN nanosheets with zigzag edge: one-step chemical synthesis, applications in wastewater treatment and preparation of highly thermal-conductive BN-polymer composites

Thermal Conductivity of Carbon Nanofibre-Polypropylene Composite Foams

A New Class of Opacified Monolithic Aerogels of Ultralow High-Temperature Thermal Conductivities

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