COMMUNICATIONSwere investigated in situ at the solid-liquid interface using a scanning tunneling microscope (STM) constructed in our institute 1151. The tunneling tips were electrochemically etched (21.i KOH + 61.i NaCN) from a0.25 mm Pt/Ir (80:20) wire. After the investigation of the pure CJsA solution. a drop of pure Py or DMPy was added. After a few minutes. images of the stoichiometric compound could be recorded. Unless mentioned otherwise, the STM images were obtained in constant height mode under ambient conditions (scan rate: 0.3 Hz per image, positive tip bias.U , = 0.1 to 1 0 V. I , = 0.5 to 1 nA). They were recorded on videotape in real time and digitized later. Data are reported as recorded without digital image processing. Single crystals suitable for X-ray crystal structure analyses [5,6] were grown by slow evaporation of T H F solutions CrystaI structure analyses were performed on an Enraf-Nonius CAD4 diffractometer. by using graphite-monochromated Cu,, radiation (i=1.5405 A). The structures were solved by direct methods (SIR 88, Molen) and refined b! full-matrix least squares analyses with anisotropic temperature factors for C. N. iind 0. The H atoms were refined in the riding mode with fixed isotropic temperature factors.
The alkali heat modification used in coal gangue. And the adsorption effect of MB on original gangue and modified gangue were observed. The results were showed that removal rate of MB was 96.87% and 45.45% by modified gangue and original gangue under the conditions of MB initial concentration 50mg·L-1. The adsorption mechanism was discussed based on Freundlich isotherm model and Langmuir isotherm model. It was proved that MB was easy to be adsorbed by modified coal gangue and the adsorption was belong to monolayer adsorption.The pseudo-second-order kinetic model was best accord to adsorption. And the rate of absorption was control by intra-particle diffusion.
The velocity field and the associated tangential tension corresponding to the flow of the viscoelastic fluid over an infinite rigid plate are determined in this paper. The characteristic of the non-Newtonian viscoelastic fluid flow is analyzed using the Stehfest method of the numerical inversion of Laplace transform. It indicates that the flow of the viscoelastic fluid is very sensitive to the material constants. Finally, some comparative diagrams concerning the velocity and tangential tension profiles are presented.
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