High thermal stability and low thermal conductivity in Ga30Sb70/Sb80Te20 nanocomposite multilayer films

2011 ◽  
Vol 257 (14) ◽  
pp. 6296-6299 ◽  
Author(s):  
Changzhou Wang ◽  
Jiwei Zhai ◽  
Suyuan Bai ◽  
Bo Shen
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Multilayer Films ◽  
High Thermal Stability ◽  
Low Thermal Conductivity

Superhydrophobic and elastic silica/polyimide aerogel based on double confinement growth strategy of the co-sol system

2022 ◽  
Author(s):  
Zhou Xiao ◽  
Jing Che ◽  
Huaxin Li ◽  
Xian Yue ◽  
Xianbo Yu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
High Temperature ◽  
High Thermal Stability ◽  
Growth Strategy ◽  
Low Thermal Conductivity

Polyimide (PI) aerogels with high thermal stability and low thermal conductivity can be used in the field of high temperature insulation. However, the super-hydrophilicity of PI aerogel will cause the...

scholarly journals Silica Aerogel Monoliths Derived from Silica Hydrosol with Various Surfactants

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3192 ◽  
Author(s):  
Dong Chen ◽  
Xiaodong Wang ◽  
Wenhui Ding ◽  
Wenbing Zou ◽  
Qiong Zhu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Silica Aerogel ◽  
Low Cost ◽  
Ambient Pressure ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Low Thermal Conductivity ◽  
Silica Hydrosol ◽  
High Production Cost

Owing to their ultra-low thermal conductivity, silica aerogels are promising thermal insulators; however, their extensive application is limited by their high production cost. Thus, scientists have started to explore low-cost and easy preparation processes of silica aerogels. In this work, a low-cost method was proposed to prepare silica aerogels with industrial silica hydrosol and a subsequent ambient pressure drying (APD) process. Various surfactants (cationic, amphoteric, or anionic) were added to avoid solvent exchange and surface modification during the APD process. The effects of various surfactants on the microstructure, thermal conductivity, and thermal stability of the silica aerogels were studied. The results showed that the silica aerogels prepared with a cationic or anionic surfactant have better thermal stability than that prepared with an amphoteric surfactant. After being heated at 600 °C, the silica aerogel prepared with a cationic surfactant showed the highest specific surface area of 131 m2∙g−1 and the lowest thermal conductivity of 0.038 W∙m−1∙K−1. The obtained low-cost silica aerogel with low thermal conductivity could be widely applied as a thermal insulator for building and industrial energy-saving applications.

Thermoelectric properties and thermal stability of layered chalcogenides, TlScQ2, Q = Se, Te

2017 ◽  
Vol 46 (48) ◽  
pp. 17053-17060 ◽  
Author(s):  
Vijayakumar Sajitha Aswathy ◽  
Cheriyedath Raj Sankar ◽  
Manoj Raama Varma ◽  
Abdeljalil Assoud ◽  
Mario Bieringer ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Band Structure ◽  
Thermoelectric Properties ◽  
Layered Chalcogenides ◽  
Low Thermal Conductivity ◽  
Structure Characteristics ◽  
Thermal Stability Of

The layered chalcogenides, TlScQ2 (Q = Se, Te), possess intriguing band structure characteristics and very low thermal conductivity.

Silicone Resin-Based Composite Materials for High Thermal Stability and Thermal Conductivity

2020 ◽  
Vol 49 (7) ◽  
pp. 4379-4384 ◽  
Author(s):  
Yi Liu ◽  
Zhenxing Chen ◽  
Yishen Qin ◽  
Yuqiu Shen ◽  
Yong Zhou ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Composite Materials ◽  
High Thermal Stability ◽  
Silicone Resin

scholarly journals Mechanically Strong, Low Thermal Conductivity and Improved Thermal Stability Polyvinyl Alcohol–Graphene–Nanocellulose Aerogel

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 170
Author(s):  
Xiuya Wang ◽  
Pengbo Xie ◽  
Ke Wan ◽  
Yuanyuan Miao ◽  
Zhenbo Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Polyvinyl Alcohol ◽  
Low Density ◽  
Composite Aerogel ◽  
Ternary Composite ◽  
Low Thermal Conductivity ◽  
Good Thermal Stability ◽  
Composite Aerogels

Porous aerogel materials have advantages of a low density, low thermal conductivity and high porosity, and they have broad application prospects in heat insulation and building energy conservation. However, aerogel materials usually exhibit poor mechanical properties. Single-component aerogels are less likely to possess a good thermal stability and mechanical properties. It is necessary to prepare multiple-composite aerogels by reinforcement to meet practical application needs. In this experiment, a simple preparation method for polyvinyl alcohol (PVA)–graphene (GA)–nanocellulose (CNF) ternary composite aerogels was proposed. This is also the first time to prepare ternary composite aerogels by mixing graphene, nanocellulose and polyvinyl alcohol. A GA–CNF hydrogel was prepared by a one-step hydrothermal method, and soaked in PVA solution for 48 h to obtain a PVA–GA–CNF hydrogel. PVA–GA–CNF aerogels were prepared by freeze drying. The ternary composite aerogel has advantages of excellent mechanical properties, a low thermal conductivity and an improved thermal stability, because strong hydrogen bonds form between the PVA, GA and CNF. The composite aerogels were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffractometry, Brunauer–Emmett–Teller analysis, dynamic thermal analysis, thermogravimetry and thermal constant analysis to characterize the properties of the ternary composite aerogels. The lightweight, low-density and porous PVA–GA–CNF composite aerogels withstood 628 times their mass. The thermal conductivity of the composite aerogels was 0.044 ± 0.005 W/mK at room temperature and 0.045 ± 0.005 W/mK at 70 °C. This solid, low thermal conductivity and good thermal stability PVA–GA–CNF ternary composite aerogel has potential application in thermal insulation.

Low thermal conductivity of amorphous Si/Si 0.75 Ge 0.25 multilayer films with Au-interlayers

2014 ◽  
Vol 105 (2) ◽  
pp. 27003 ◽  
Author(s):  
C. Lin ◽  
Z. G. Zeng ◽  
F. J. Ye ◽  
X. Luo ◽  
B. J. Shen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Multilayer Films ◽  
Low Thermal Conductivity ◽  
Amorphous Si

Thermal stability and enhanced thermoelectric properties of the tetragonal tungsten bronzes Nb8−xW9+xO47 (0 < x < 5)

2017 ◽  
Vol 5 (20) ◽  
pp. 9768-9774 ◽  
Author(s):  
G. Cerretti ◽  
M. Schrade ◽  
X. Song ◽  
B. Balke ◽  
H. Lu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Electrical Resistivity ◽  
Thermoelectric Properties ◽  
Thermal Transport ◽  
Low Thermal Conductivity

Engineering of nanoscaled structures allows to control the electrical and thermal transport in solids for thermoelectric applications where a combination of low thermal conductivity and low electrical resistivity is required.

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