CU II complexes of 1-salicoyl-4-phenylthiosemicarbazide (SPT) have been synthesized and characterized by means of elemental analysis, magnetic measurements, and i.r. and e.p.r, spectroscopic methods; 1H-and 13C-n.m.r. and mass spectral data on the thiosemicarbazide are also reported. A paramagnetic complex #elf= 1.298B.M., is formed with copper(II) sulphate; the low magnetic moment and the e.p.r, spectral data suggest a binuclear species. A diamagnetic complex due to a strong Cu-Cu interaction has been isolated with copper(II) chloride.
A Faraday cage based on a design by Drummond (1971) has been used in a Philips EM300 electron microscope operating at 100 kV to measure the image current for specimens consisting of lead particles condensed on thin carbon substrates.Figure 1 shows how the current in the image of a given specimen changes when the temperature of the specimen is altered. At A' the specimen consists of polycrystalline lead. As the temperature is increased, some of the smaller particles begin to melt (Blackman and Curzon, 1959). Eventually, in the temperature range A to B, the remainder of the particles melt. Tm is called the melting temperature. When the temperature is reduced from above Tm the particles supercool but they eventually solidify over the range B' to A' in the vicinity of Ts. Electron diffraction experiments were conducted to verify that the changes shown in Figure 1 were in fact correlated with the melting and solidification of the lead particles as stated above.
In this paper, various amine-modified CO2 adsorbents were prepared by incorporating tetraethylenepenthamine (TEPA) onto SBA-15(P) by controlling dynamic impregnation process. The materials were characterized by X-ray diffraction (XRD), nitrogen adsorption/desorption, elemental analysis (EA) and Fourier transform infrared (FT-IR) experiments. Moreover, the adsorption capacities and cycle life were evaculated by CO2 temperature programmed desorption (CO2-TPD). Various characterization results indicate that the morphology and loading amount of TEPA on the support material were controlled by adjusting dynamic impregnation times. Under given conditions, there is an optimum dynamic impregnation times.
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