[en] Nanocomposites of conducting polyaniline (PAni) and cadmium sulphide (CdS) has been synthesized via in situ generation of CdS from highly reactive organometallic cadmium precursor i.e. dimethyl cadmium (DMCd) in N,N'-dimethyl formamide (DMF). UV-Vis absorption spectra of PAni-CdS nanocomposite showed λ_(max) at about 440-445 nm in addition to the bands present at ∼325 and ∼615 nm due to PAni. The absorption band at ∼440-445 nm is identified due to nanosized CdS particles indicating a blue shift of about >70 nm with respect to bulk CdS. The X-ray diffraction pattern showed broad peaks due to formation of nanoparticles of CdS in polyaniline matrix. Scanning electron microscopy (SEM) showed that the particles are in agglomerated form. Organometallic compound i.e. dimethyl cadmium (Me₂Cd) is used for the first time with polyaniline for CdS nano particles

[en] Mathematical models for both bench- and pilot-scale methanol synthesis reactors were developed by estimating the overall heat transfer coefficients due to different heat transfer characteristics, while the effectiveness factor was fixed because the same catalysts were used in both reactors. The overall heat transfer coefficient of a pilot-scale reactor was approximately twice that of a bench-scale reactor, while the estimate from the correlation reported for the heat transfer coefficient was 1.8-times higher, indicating that the values determined in the present study are effective. The model showed that the maximum methanol production rate of approximately 16 tons per day was achievable with peak temperature maintained below 250 °C in the open-loop case. Meanwhile, when the recycle was used to prevent the loss of unreacted gas, peak temperature and production rate decreased due to low CO and CO₂ fraction in the recycled stream at the same space velocity as the open-loop operation. Further analysis showed that, since the reaction was in the kinetic regime, the production rate could be maximized up to 18.7 tons per day by increasing the feed flowrate and inlet temperature despite thermodynamically exothermic reaction.

[en] Nano layers of PbSe have been fabricated in liquid medium via direct reaction of lead acetate and n-trioctylphosphine bonded selenium. The effect of temperature on particles diameter is studied. The scanning electron microscopy reveals that the layer-by-layer deposition has taken place with average diameter of the particle of about <20 nm. The XRD measurement shows that higher temperature is favorable for layered nanocrystals of PbSe and NIR measurement shows that absorption at 3.31 μm is due to size quantization effect thus increasing the band gap energy from 0.27 to 0.56 eV, which is the reported value for bulk PbSe

[en] Indium phosphide nanocrystals have been synthesized by the direct reaction of sodium phosphide and indium trichloride pre-combined with n-trioctylphosphine in 4-ethylpyridine as a suitable solvent for terminating the particles growth. The formation of InP particles with the size of c.a. 3-7 nm was evidenced by the analysis of powder X-ray diffraction, solution UV-vis spectra and transmission electron microscopy

[en] Nanocrystalline indium phosphide has been synthesized via catalytic cleavage of P-C bond in n-trioctylphosphine by indium nanoparticles at a temperature between 200 and 360 deg. C under an atmosphere of argon. Indium chloride/sodium as well as indium⁽⁰⁾ could be used as raw materials. The products were characterized by EDS, XRD, SEM, FESEM and PL techniques. XRD pattern of the obtained powder showed all the major peaks due to zinc blend indium phosphide with the sizes of 30-60 nm. FT-IR and TG/DTA studies indicated that InP particles were capped with TOP