Amperometric Gas‐Phase Sensor for the Determination of Ammonia in a Solid‐State Cell Prepared by a Sol‐Gel Process

1996 ◽  
Vol 143 (6) ◽  
pp. L126-L128 ◽  
Author(s):  
James A. Cox ◽  
Kathryn S. Alber
Keyword(s):  
Solid State ◽  
Gas Phase ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Solid State Cell ◽  
Phase Sensor

Preparation and Microwave-Absorption Property of SiO2-SiC-Based Composites

2010 ◽  
Vol 434-435 ◽  
pp. 231-234
Author(s):  
Li Guan ◽  
Bing Bing Fan ◽  
Ming Liang Li ◽  
He Jing Wen ◽  
Kai Li ◽  
...  
Keyword(s):  
Solid State ◽  
Microwave Absorption ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Composite Particles ◽  
Network Analyzer ◽  
Epoxide Resin ◽  
Maximum Reflectivity ◽  
Sol Gel Process ◽  
Sic Composites

SiO2-SiC composite particles were prepared using a sol-gel process. BaTiO3 powders were synthesize through solid-state reaction. They were mixed as microwave absorbents with Fe3O4 powders to obtain the complex absorption. Epoxide resin (EP) was used as matrix and solidified with the mixtures. The techniques of DSC-TG, XRD were used to characterize the composite particles and the obtained compacts. A vector network analyzer was used to measure the reflectivity of the SiO2-SiC-based composites. The effects of the aborbents’ contents on the reflection of the microwave absorption materials were disscussed. It was found that SiO2-SiC composites could be prepared using sol-gel process and BaTiO3 powders could be synthesize through solid-state reaction. The results indicated that SiO2-SiC composite is contribute to absorb microwave, where SiO2-SiC: BaTiO3: Fe3O4 = 6:2:2 (vol %), the frequency region in which the maximum reflectivity is more than -10 dB is 5.4-7.6 GHz.

scholarly journals New Condensation Polymer Precursors Containing Consecutive Silicon Atoms—Decaisopropoxycyclopentasilane and Dodecaethoxyneopentasilane—And Their Sol–Gel Polymerization

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 841
Author(s):  
Sung Jin Park ◽  
Myong Euy Lee ◽  
Hyeon Mo Cho ◽  
Sangdeok Shim
Keyword(s):  
Solid State ◽  
Sol Gel ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Cross Polarization ◽  
Reaction Conditions ◽  
Polymer Precursors ◽  
Sol Gel Process ◽  
Angle Spinning ◽  
Magnetic Resonances

The sol–gel polymerization of alkoxysilanes is a convenient and widely used method for the synthesis of silicon polymers and silicon–organic composites. The development of new sol–gel precursors is very important for obtaining new types of sol–gel products. New condensation polymer precursors containing consecutive silicon atoms—decaisopropoxycyclopentasilane (CPS) and dodecaethoxyneopentasilane (NPS)—were synthesized for the preparation of polysilane–polysiloxane material. The CPS and NPS xerogels were prepared by the sol–gel polymerization of CPS and NPS under three reaction conditions (acidic, basic and neutral). The CPS and NPS xerogels were characterized using N2 physisorption measurements (Brunauer–Emmett–Teller; BET and Brunauer-Joyner-Halenda; BJH), solid-state CP/MAS (cross-polarization/magic angle spinning) NMRs (nuclear magnetic resonances), TEM, and SEM. Their porosity and morphology were strongly affected by the structure of the precursors, and partial oxidative cleavage of Si-Si bonds occurred during the sol–gel process. The new condensation polymer precursors are expected to expand the choice of approaches for new polysilane–polysiloxane.

Fabrication of TiO2and CytochromecAlternate Ultrathin Films via a Gas-phase Surface Sol–Gel Process

2006 ◽  
Vol 35 (9) ◽  
pp. 990-991 ◽  
Author(s):  
Do-Hyeon Yang ◽  
Naoki Takahara ◽  
Naoki Mizutani ◽  
Seung-Woo Lee ◽  
Toyoki Kunitake
Keyword(s):  
Gas Phase ◽  
Ultrathin Films ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Phase Surface

Selective oxidation of gas phase ammonia over copper chromites catalysts prepared by the sol–gel process

2011 ◽  
Vol 15 (1) ◽  
pp. 32-36 ◽  
Author(s):  
A. Kaddouri ◽  
N. Dupont ◽  
P. Gélin ◽  
A. Auroux
Keyword(s):  
Gas Phase ◽  
Selective Oxidation ◽  
Sol Gel ◽  
Sol Gel Process

COMPARATIVE STUDY OF Bi-2223/Ag SUPERCONDUCTORS DERIVED FROM PARTICLES SIZE OF STARTING MATERIALS

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3246-3249 ◽  
Author(s):  
D. SÝKOROVÁ ◽  
O. SMRČKOVÁ ◽  
K. RUBEŠOVÁ ◽  
P. VAŠEK
Keyword(s):  
Solid State ◽  
Comparative Study ◽  
Temperature Dependence ◽  
Solid State Reaction ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Current Densities ◽  
Size Of Particles ◽  
Micrometer Size

Series of the samples with nominal compositions Bi 3.2 Pb 0.8 Sr 4 Ca 5 Cu 7 O x and Bi 3.2 Pb 0.8 Sr 4 Ca 5 Cu 7 O x / Ag (10 wt%) were prepared by the standard solid state reaction at the same calcination and sintering temperature and time. Three starting mixtures were used, carbonates, oxides and silver i) with nanoparticles, ii) with micrometer size of particles and iii) powder obtained by modified sol-gel process. The main phase in all samples was Bi -2223 and silver formed the separate phase. The sol-gel process was found to be effective way in term of porosity, bulk density and connectivity of the grains. The effect of the microstructure on the transport properties were described by the temperature dependence of resistivity and critical current densities.

Magnetic, electrical, and microstructural properties of YBa2Cu3O7: A comparison of sol-gel, co-precipitated, and solid state processing routes

1989 ◽  
Vol 4 (5) ◽  
pp. 1099-1102 ◽  
Author(s):  
E. A. Hayri ◽  
M. Greenblatt ◽  
K. V. Ramanujachary ◽  
M. Nagano ◽  
J. Oliver ◽  
...  
Keyword(s):  
Solid State ◽  
Sol Gel ◽  
Meissner Effect ◽  
Uniform Size ◽  
High Temperature Reaction ◽  
Sol Gel Process ◽  
Solution Methods ◽  
Yttrium Barium ◽  
Co Precipitation ◽  
State Processing

Samples of YBa2Cu3O7 were prepared by sol-gel, co-precipitation, and solid state processes. Sol-gel samples were prepared from a solution of yttrium, barium, and copper nitrates dissolved in ethylene glycol, co-precipitated samples were made by the amorphous citrate method, and solid state samples were prepared by conventional high temperature reaction of the appropriate metal oxides and carbonates. The sol-gel process was shown to yield superconducting samples of superior Meissner effect, critical current, and critical field. The co-precipitated samples contain impurities that affect the critical properties. The sol-gel and co-precipitated processes yield materials with well-formed, plate-like particles with a fairly uniform size of about 10 μm. The grains in the solid state sample are smaller but have a much wider distribution of sizes than the samples prepared by solution methods.

Voltammetric determination of aluminum(III) using a reagentless sensor fabricated by sol–gel process

2004 ◽  
Vol 99 (2-3) ◽  
pp. 468-473 ◽  
Author(s):  
Junwei Di ◽  
Shuping Bi ◽  
Tianyu Yang ◽  
Ming Zhang
Keyword(s):  
Sol Gel ◽  
Voltammetric Determination ◽  
Sol Gel Process
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