Dielectric properties of pyrogenic silicon dioxide

1989 ◽  
Vol 24 (5) ◽  
pp. 593-596
Author(s):  
L. G. Grechko ◽  
V. I. Zarko ◽  
G. M. Kozub ◽  
V. V. Motrich ◽  
A. A. Chuiko
Keyword(s):  
Dielectric Properties ◽  
Silicon Dioxide ◽  
Pyrogenic Silicon Dioxide

Dielectric Properties of Styrene—Butadiene Rubber/Silicon Dioxide Mixtures

1973 ◽  
Vol 5 (2) ◽  
pp. 83-90 ◽  
Author(s):  
Faika F. Hanna ◽  
Abbas A. Yehia ◽  
Abdel-Fattah Abou-Bakr
Keyword(s):  
Dielectric Properties ◽  
Silicon Dioxide ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene

scholarly journals Silver nanoparticles deposited on pyrogenic silica solids: Preparation and textural properties

2017 ◽  
Vol 35 (7-8) ◽  
pp. 714-720 ◽  
Author(s):  
M Zienkiewicz-Strzałka ◽  
M Błachnio ◽  
A Deryło-Marczewska ◽  
RB Kozakevych ◽  
YM Bolbukh ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silicon Dioxide ◽  
Noble Metal ◽  
Materials Science ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Nanostructured Material ◽  
Scanning Calorimetry ◽  
Adsorption Desorption ◽  
Pyrogenic Silicon Dioxide

Silver-based nanomaterials and composites are important components in materials science and engineering due to the reactivity of silver nanophase based on exceptional surface effects. Ag-doped SiO2 nanocomposites were synthesized by wet impregnation procedure of aminopropyl-functionalized silica materials with submicrometer structure. Aminopropyl-functionalized pyrogenic silicon dioxide with amount of amino groups established as half and close to full monolayer was used to immobilize the nanosilver phase obtained from ammoniacal silver complex as a noble metal precursor. Pyrogenic silicon dioxide as an inexpensive nanostructured material with useful properties including adsorptive affinity for noble metal ions and organic macromolecules was applied as a support for diamminesilver(I) ions and finally for silver nanoparticles. In the present study, the effect of amino-functionalization and silver nanoparticles deposition was monitored by investigation of the textural properties and thermal stability of obtained nanocomposites. The properties of the nanocomposites were investigated by transmission electron microscopy, nitrogen adsorption–desorption isotherms, and thermal analysis (thermogravimetry/differential scanning calorimetry).

Improvement in dielectric properties of low temperature PECVD silicon dioxide by reaction with hydrazine

1995 ◽  
Vol 24 (6) ◽  
pp. 751-755 ◽  
Author(s):  
K. W. Vogt ◽  
M. Houston ◽  
M. F. Ceiler ◽  
C. E. Roberts ◽  
P. A. Kohl
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Silicon Dioxide

Dielectric properties of silicon dioxide/wood composite

2007 ◽  
Vol 41 (6) ◽  
pp. 511-522 ◽  
Author(s):  
Yunlin Fu ◽  
Guangjie Zhao
Keyword(s):  
Dielectric Properties ◽  
Silicon Dioxide ◽  
Wood Composite

Physical and Dielectric Properties of the Metal-Silicon Dioxide-Silicon System

1962 ◽  
Vol 109 (2) ◽  
pp. 94 ◽  
Author(s):  
J. L. Sprague ◽  
J. A. Minahan ◽  
O. J. Wied
Keyword(s):  
Dielectric Properties ◽  
Silicon Dioxide ◽  
Silicon System

scholarly journals GENERATION OF NANO-FILLED EPOXY-POLYESTER COMPOSITE MATERIALS FOR PROTECTION OF ELEMENTS OF VESSEL TECHNICAL MEANS

2020 ◽  
Vol 1 (22) ◽  
pp. 154-162
Author(s):  
M. Brailo ◽  
◽  
S. Yakushchenko ◽  
O. Kobelnik ◽  
N. Buketova ◽  
...  
Keyword(s):  
Composite Material ◽  
Silicon Dioxide ◽  
Heat Resistance ◽  
Temperature Coefficient ◽  
Thermophysical Properties ◽  
Linear Expansion ◽  
Technical Equipment ◽  
Thermal Coefficient ◽  
Coefficient Of Linear Expansion ◽  
Pyrogenic Silicon Dioxide

The influence of nanofillers on thermophysical properties of epoxy-polyester composites has been investigated in the work. The filler content (oxidized nanodisperse additive and pyrogenic silicon dioxide) has been varied within q = 0.02…1.0 pts.wt. per 100 pts.wt. of epoxy oligomer ED-20. It has been discovered that the introduction of the oxidized nanodisperse additive in the amount of q = 0.05…0.08 pts.wt. into the epoxy-polyester binder leads to an improvement in the thermophysical properties of the composite. Value of heat resistance (according to Martens) increased from Т = 335 К (for the epoxy-polyester matrix) to T = 346 K at the content of oxidized nanodisperse additive of q = 0.075 pts.wt. Introduction of q = 0.05 pts.wt. of oxidized nanodisperse additive allows to obtain improved values of the temperature coefficient of linear expansion in different temperature ranges: in the region ΔT = 303…323 K – α = 1.0 × 10-5 K-1, in the region ΔT = 303… 373 K - α = 1.9 × 10-5 K-1, in the region ΔT = 303… 423 K – α = 3.4 × 10-5 K-1. It has been determined that the composite material has also improved its heat resistance (according to Martens), which is T = 347 K and the minimum thermal coefficient of linear expansion at the content of q = 0.05 pts.wt. of pyrogenic silicon dioxide nanofiller. Values of the temperature coefficient of linear expansion were: α = 1.0 × 10-5 K-1 in the region (ΔT = 303… 323 K), α = 1.9 × 10-5 K-1 (in the region ΔT = 303… 373 K), Δα = 3.4 ×× 10-5 K-1 (in the region ΔT = 303… 423 K), α = 8.4 × 10-5 K-1 (in the region ΔT = 303… 473 K). It is recommended that in order to form a composite material with improved thermophysical properties to protect the elements of ship technical equipment, it is advisable to introduce the pyrogenic silicon dioxide nanofiller in the amount of q = 0.05 pts.wt. into the epoxy-polyester binder.

Sintering, Microstructure and Dielectric Properties of Ca-Al-B-Si-O Glass/Al2O3 Composites with Various SiO2 Content

2011 ◽  
Vol 130-134 ◽  
pp. 1516-1519
Author(s):  
Ming Liu ◽  
Hong Qing Zhou ◽  
Hai Kui Zhu ◽  
Min Liu ◽  
Jian Xin Zhao
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Silicon Dioxide ◽  
Bulk Density ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
Tan Δ ◽  
Silicon Dioxide Content

The effects of silicon dioxide addition on the sintering, microstructure and microwave dielectric properties of Ca-Al-B-Si-O glass/Al2O3 composites were investigated. Results show that: Increasing the silicon dioxide content in the glass leads to the corresponding rise of bulk density, dielectric constant of the LTCC materials and the decrease of its dielectric loss and porosity. A bulk density of 2.92 g·cm-3, a porosity of 0.2%, aεr value of 7.11 and a tan δ value of 0.00096(measured at 10 MHz) are obtained for 68 wt% silicon dioxide of the samples sintered at 875°C for 30 min.

Sign in / Sign up

Export Citation Format

Share Document