Peng G,Wang Y H,Hua C W,et al.Heteropolyoxometalates which are included in microporous silica,CsxH3-xPMo12O40/SiO2and CsyH5-yPMo10V2O40/SiO2,as insoluble solid bifunctional catalysts:synthesis and selective oxi
Which of the following crystals would be most brittle and hard? a. Ag b. ZnS c. F2 d. C12H22O11 (1) Define the term metallic lustre and non-metallic lustre? (2) Highlight the difference between them as well as give two example of eac...
Biaxially oriented polyester films which have a polyester-containing base layer (B) and a matt overlayer (A), and are characterized by the following features: a) the transverse shrinkage of the film is between 1 and 23%, b) the transverse linear expansion of the film during thermo-mechanical...
(R2)3SiO1/2; where the radicals R2 and R3 have the following definitions: the radicals R2, which are identical to or different from each other, are selected from the group consisting of methyl, ethyl, propyl and isopropyl radicals, the radicals R3, which are identical to or different from...
A process for the production of silica brick material which contains finely divided SiO21378452 Refractory brick ELKEM AS 17 April 1972 [26 April 1971] 17623/72 Heading C1J A silica brick is made by kneading a mixture of finely divided SiO 2 containing material (e.gthe SiO 2 dust from ...
CONSTITUTION:The objective fluorescent material is produced by applying a specific colloidal silica having the following properties to the surface of a fluorescent material and fixing the silica with an adhesive. The colloidal silica contains SiO2 having spherical form, containing >=70wt.% of particles...
--- 0.9 I have found that a cement of this type which contains a high percentage of alumina and a comparative small amount of silica while being nearly or completely free of iron oxides improves greatly the heat resistance of concrete formed with such cement as a binder. I have also found...
the ratio of the R(CH3)2SiO0.5 units (R=C1--C3alkyl or vinyl) to SiO2units is 0.4:1 to 1.2:1 and which contains 0.5 - 3.5% by weight OH groups bonded to Si and by using an amino organosilicon compound which is an aminoorganosilane of the general formula (i) (R"O)3-p R'pSi...