THE REACTION OF 2′2′3′3′-TETRAFLUORO-PROPYL-5-IODO-3-OXA-OCTAFLUOROPENTANESULFONATE WITH DIMETHYLSULFOXIDE AND DETERMINATION OF CRYSTAL STRUCTURE OF ONE OF THE PRODUCTS
It includes raw material mass ratio CaO∶S∶H 2O=1∶1.9∶6,small boiling for 45 min at atmospheric pressure,the density of the solution should amount to 1.38 g/ml by dehydrate in low temperature,crystallizing in -10 ℃.
原料质量为CaO∶S∶H2 O =1∶1 9∶6 ,常压微沸 45min ,水剂低温脱水密度达 1 38g/ml,- 10℃低温结晶。
The result shows that the crystallizing temperature rises with the increasing of R, F and decrease with Na2O, MgO, Al2O3, the effect of Na2O and F are more obvious.
In this article, using cooling method to crystallize mNH_4H_2PO_4· nKH_2PO_4 from the KCl--NH_4H_2PO_4--H_2O system has been studlied in detail experimentally.
Both 1 and 2 crystallize in space group P -1, with cell parameters a =0 7509(4) nm, b =1 2113(6) nm, c =1 5936(8) nm, α =102 636(10)°, β =102 703(11)°, γ =91 318(10)°(1);
It is found that the Fe-based Er_3(Fe,M)_ 29 compounds crystallize in the Th_2Ni_ 17-type structure with disordered substitution of the dumbbell Fe-Fe, instead of Nd_3(Fe,Ti)_ 29-type structure, so its chemical formula can also be expressed as Er_ 2-n(Fe,M)_ 17+2n (n=0.2).
(2)by XRD analyzing to the calcined materials at1250℃,1300℃ and 1400℃ with 6% coal-gangue added,it is known that the materials has been calcined sufficiently at 1300℃,C3S crystallize degree is high,so the burning of clinker is ranged at 1300～1400℃.
Mordenite composite membranes were prepared by means of coating a porous α-alumina support with nanosized mordenite seeds followed by hydrothermal crystallization.
The growth rate of the mordenite crystal increases more along c-axis than that along a-axis or b-axis with increasing temperature for hydrothermal crystallization.
At 468.3 K the half crystallization time (t1/2) of samples freeze-dried from a solution of 1×10-4 g/mL was about 36 s, which was merely one tenth of that of the bulk sample.
Here, we report using the estrogen receptor that the location of drugs in x-ray crystal structures of the receptors matches closely their predicted spatial locations in the DNA.
The ageing of the reaction mixture reduces the growth rate of mordenite crystal along a-axis and b-axis but hardly influences the growth rate along c-axis.
The paraffin wax (with melting temperature of 29°C, crystallizing temperature of 26°C and latent heat of 142 J/g) served as latent heat storage material and the silica as supporting material, which prevented the leakage of the melted paraffin wax.
The adhesion interaction between the particles of various amorphous glassy polymers and crystallizing poly(ethylene glycol) is investigated in the air and in the argon atmosphere.
The described variant of the indentation method makes it possible to considerably decrease the time of measurements and to extend the range of the measured viscosity for easily crystallizing glasses toward higher temperatures.
When the thickness is d >amp;gt; 2 Rg (radius of gyration), the polymer can crystallize into spherulites; when Rg >amp;lt; d >amp;lt; 2 Rg, a dense-branch morphology and dendrites could be found; when d >amp;lt; Rg, an "islands" structure could be obtained.
Moreover, nickel oxide reduces the crystallization ability of the magnesium aluminotitanate phase and magnesium aluminotitanates do not crystallize in glasses containing 5 mol % NiO.
In order for the β-BaO ? 2B2O3 modification to crystallize, the glass should be purified from dissolved gases and have an undisturbed fire-polished surface.
The solid-phase method is used to synthesize ternary manganites of composition DyMIMgMn2O6 (MI - Na, K, Cs); their X-ray investigation is performed to demonstrate that they all crystallize in orthorhombic system.
结晶
crystallization
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