Allergy to a Carbon-Functional Organic Silicon Compound, Dimethyldi-(4-hydroxyphenyl)-silane

Nature ◽  
1961 ◽  
Vol 192 (4806) ◽  
pp. 989-990 ◽  
Author(s):  
SIGFRID FREGERT ◽  
HANS RORSMAN
Keyword(s):  
Silicon Compound ◽  
Organic Silicon Compound ◽  
Organic Silicon

Investigations and Countermeasures for Deactivation of the Hydrogen Recombination Catalyst at Hamaoka Unit 4 and 5

2010 ◽  
Author(s):  
Toru Kawasaki ◽  
Motohiro Aizawa ◽  
Hidehiro Iizuka ◽  
Koji Yamada ◽  
Mitsuo Kugimoto
Keyword(s):  
Hydrogen Concentration ◽  
Low Pressure ◽  
Active Surface Area ◽  
Hydroxyl Groups ◽  
Silicon Compound ◽  
Recombination Reaction ◽  
Gamma Alumina ◽  
Organic Silicon ◽  
Low Pressure Turbine ◽  
Hydrogen Recombination

At Hamaoka Unit 4 and 5, the hydrogen concentration in the outlet of off-gas recombiner had increased, and the reactors could not continue start-up operation. Therefore, we investigated the causes of the deactivating the recombination reaction and selected appropriate countermeasures to the plants. From our investigation, two types of deactivation mechanism are found. One of the causes was decreasing the active surface area of alumina as support material by the dehydrative condensation. The other cause was poisoning of the catalyst by organic silicon compound. The organic silicon was introduced from organosilicon sealant used at the junctions of the low-pressure turbine. We also found that the boehmite rich catalyst was deactivated more easily by the organic silicon than gamma alumina because boehmite had a lot of hydroxyl groups. Finally, we estimated that the deactivation of the hydrogen recombination catalysts was caused by combined two factors, which are characteristics of boehmite catalyst support and the poisoning by the organic silicon on the catalyst surface. As the countermeasures, the boehmite was changed into more stable gamma alumina by adding the heat treatment in hydrogen atmosphere at 500°C for 1 hour, and the source of organic silicon, organosilicon sealant, was removed. At Hamaoka Unit 4 and 5 improved catalysts were applied. Moreover, linseed oil that used to be used at the plants was applied again as sealant of the low-pressure turbine casing instead of the organosilicon sealant. As a result of application of these countermeasures, the reactors could be started without increase of the hydrogen concentration at these plants.

The Synthesis of Silicon-containing Polyester Directly from SiO2 and Characterization of Its Structure

2000 ◽  
Vol 661 ◽  
Author(s):  
Jianhua Song ◽  
Luyi Sun ◽  
Anhua Liu ◽  
Kecheng Gong
Keyword(s):  
Ir Spectra ◽  
Average Molecular Weight ◽  
Silicon Compound ◽  
Number Average Molecular Weight ◽  
Strong Absorption Band ◽  
Organic Silicon Compound ◽  
New Approach ◽  
Good Thermal Stability ◽  
Temperature Solution

ABSTRACTA new approach to the synthesis of a novel silicon-containing polyester by noncarbothermal method directly from SiO2 was studied. At first, a high reactive pentacoordinate organic silicon compound (KSi(OCH2CH2O)2(OCH2CH2OH)) was prepared by the reaction of the fumed silica with ethylene glycol (EG) and KOH. Then, a novel double hydroxy tetracoordinate silicon monomer (OCH2CH2O)Si(OCH2CH2OH)(OCH2CH2OCH2CH2OH) was synthesized by the reaction of ClCH2CH2OH with reactive pentacoordinate silicon compound. Finally, a silicon-containing polyester was synthesized by low temperature solution condensation between tetracoordinate silicon compound and p-phthaloyl chloride in dimethyl sulfoxide (DMSO). The product was characterized by FTIR, TG, GPC, etc. The IR spectra of polyester exhibited a characteristic strong absorption band for ester carbonyl in the 1722.2cm-1. IR spectra also showed absorption at 1124.6cm-1 due to the O-Si-O group. TG analysis showed its good thermal stability. GPC analysis showed that the number average molecular weight of this siliconcontaining polyester was about ninety thousand.

scholarly journals Stretchable micro-scale concentrator photovoltaic module with 15.4% efficiency for three-dimensional curved surfaces

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Daisuke Sato ◽  
Taizo Masuda ◽  
Kenji Araki ◽  
Masafumi Yamaguchi ◽  
Kenichi Okumura ◽  
...  
Keyword(s):  
Concentration Ratio ◽  
Power Conversion ◽  
Three Dimensional ◽  
Thin Film Solar Cells ◽  
Photovoltaic Module ◽  
Silicon Compound ◽  
Curved Surfaces ◽  
Power Sources ◽  
Micro Scale ◽  
Module Design

AbstractStretchable photovoltaics are emerging power sources for collapsible electronics, biomedical devices, and buildings and vehicles with curved surfaces. Development of stretchable photovoltaics are crucial to achieve rapid growth of the future photovoltaic market. However, owing to their rigidity, existing thin-film solar cells based predominantly on silicon, compound semiconductors, and perovskites are difficult to apply to 3D curved surfaces, which are potential real-world candidates. Herein, we present a stretchable micro-scale concentrator photovoltaic module with a geometrical concentration ratio of 3.5×. When perfectly fitted on a 3D curved surface with a sharp curvature, the prototype module achieves an outdoor power conversion efficiency of 15.4% and the daily generated electricity yield improves to a maximum of 190% relative to a non-concentration stretchable photovoltaic module. Thus, this module design enables high areal coverage on 3D curved surfaces, while generating a higher electricity yield in a limited installation area.

Photothermal Micro- and Nanopatterning of Organic/Silicon Interfaces

Langmuir ◽  
2010 ◽  
Vol 26 (9) ◽  
pp. 6826-6831 ◽  
Author(s):  
Benjamin Klingebiel ◽  
Luc Scheres ◽  
Steffen Franzka ◽  
Han Zuilhof ◽  
Nils Hartmann
Keyword(s):  
Organic Silicon

Assessment of Damage from Organic Protective Coating Treatments to Historic Stone Buildings and Sculptures

2010 ◽  
Vol 44-47 ◽  
pp. 610-613
Author(s):  
Qiang Liu ◽  
Bing Jian Zhang
Keyword(s):  
Protective Coating ◽  
Side Effect ◽  
Protective Coatings ◽  
Organic Coating ◽  
Stone Conservation ◽  
Silicon Compounds ◽  
Artificial Weathering ◽  
Organic Silicon ◽  
Destruction Mechanism ◽  
Historic Stone

The conservation of historic stone buildings and sculptures is receiving growing attention because of weathering. Now, the techniques for stone conservation are primarily achieved through the use of organic coating treatments. Although some defects of organic protective materials have been recognized, the further shortcoming is still short of awareness. Here we show our investigations of the side effect of organic coating treatments. Some kinds of common stones, including sandstone, tuff, granite, dolomite and marble, were selected as protected objects. Organic silicon compounds were used as protective coatings. The artificial weathering, including salting, freezing and heating, was designed. The treated stones’ decaying was investigated. The results reveal that the treated stone decaying is aggravated. Moreover, the destruction mechanism has been discussed.

Annealing effects on magnetic properties and strength of organic-silicon epoxy resin-coated soft magnetic composites

2013 ◽  
Vol 228 (12) ◽  
pp. 2049-2058 ◽  
Author(s):  
Ling Xiao ◽  
Yanhua Sun ◽  
Chunhua Ding ◽  
Lihua Yang ◽  
Lie Yu
Keyword(s):  
Magnetic Properties ◽  
Epoxy Resin ◽  
Strength Analysis ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Coating Materials ◽  
Maximum Heat ◽  
Iron Powders ◽  
Organic Silicon ◽  
Soft Magnetic Composites

Soft magnetic composites (SMCs) can be described as soft magnetic powders covered by electrically insulating layers. In this work, iron powders with high purity and organic-silicon epoxy resin were chosen for good magnetic properties, thermal stability, and mechanical properties, respectively. The effect of amount of resin, different annealing temperatures on the microstructure, and performance of SMCs was investigated. Results show that organic-silicon epoxy resin has excellent properties as dielectric coating materials for coating iron powders and maximum heat-resistant temperature is about 400 ℃. According to magnetic properties and flexural strength analysis, the optimum annealing temperature of organic-silicon epoxy resin-coated composite is 200 ℃. Furthermore, the finite element analysis indicates that the strength of the whole composites is related to the adhesion of resin and iron and the strength of resin itself.

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