The inventive composition contains (mass%.) Silica 2 - 7; ethylene glycol 1.2 - 3.0, the etchant of 0.5 - 1.0; surfactant slurry through polymethylsiloxane 0.2 - 0.6, and water - the rest. After stirring for 10 min, silica, aqueous solution of ammonia, potassium hydroxide and ethylene ...
Glass object (I) comprises chemical composition of silica-sodium-calcic type comprising optical absorbing agents, which comprises ferric oxide (0.01-0.5%) and vanadium pentoxide (0.01-0.5%), where the chemical composition further comprises at least one of the agents comprising nickel oxide (0.002-0....
aThe chemical composition of natural bentonite obtained by using EDX analysis, given in Table 1, indicates the presence of silica and alumina as major constituents along with traces of sodium, potassium, iron, magnesium, calcium, and titanium oxides in the form of impurities. XRD results combined...
Equisetaceae has been of research interest for decades, as it is one of the oldest living plant families, and also due to its high accumulation of silica up to 25% dry wt. Aspects of silica deposition, its association with other biomolecules, as well as the chemical composition of the ou...
Chemical, isotopic, and thermodynamic properties have been measured of CO 2-rich ground waters in the central California Coast Ranges. The acidic CO 2-rich waters react with serpentine to form silica-carbonate rock, the host rock of many mercury deposits in the Coast Range of California. In pa...
Objective To study the chemical constituents of Pluchea indica.Methods The compounds were isolated and purified by repeated column chromatography on silica,Sephadex LH20 gel,and HPLC and structurally identified by spectral analysis.Results Twelve compounds were identified as multiflorenol(12),valenc-1(10...
In this investigation, effect of chemical composition on sintering and mechanical/thermomechanical properties has been studied. It was found that the densification process is dependent on the Al 2 O 3 /SiO 2 ratio. Silica rich composition achieves highest density at 1525°C whereas the alumina ...
The present invention provides an aqueous composition useful for polishing silica and silicon nitride on a semiconductor wafer comprising by weight percent 0.01 to 5 carboxylic acid polymer, 0.02 to 6 abrasive, 0.01 to 10 polyvinylpyrrolidone, 0.005 to 5 cationic compound, 0.005 to 5 zwitterionic co...
Chapter4ChemicalComponentsofWood木材的化学组成 Ⅰ.Polysaccharidefractionsofthecellwall木材细胞壁上的多糖Ⅱ.Lignin木素Ⅲ.Secondarycellwallcomponents细胞壁上的次要成份Ⅳ.Analyticaldata分析数据 1 Allpropertiesofwoodarisefromthenatureandorganizationofthechemicalcompounds.SchematicClassificationoftheChemicalComponentsofCell...
15 Ⅳ. Analytical data 分析数据 In general terms, the chemical composition of wood on an oven dry basis can be summarized as: Cellulose: 40 - 50% Hemicelluloses: 20 - 35% Lignin: 15 - 35% Extractives: 1 – 40% Ash (inorganic components) : < 1% 16 Reflection and practice: 1. ...