Papers by Keyword: Organic Solvent

Abstract: Colloidal CdSe Nanocrystals (NCs) or quantum dots (QDs) have been developed using a yielding solution technique utilizing chemical reactions in chloroform and oleic acid in different organic solvents. This assembly is an improvement of the systematic thermal decomposition of high temperature organic solvent compounds. CdSe NCs of specific sizes can be produced easily by adjusting the solvent. This technique is reproducible and clear, so industrial development can be easily scaled up. Characterization at room temperature of the UV-Vis absorption and Photoluminescence (PL) spectra. Results reveal that the CdSe prepared with the creation of defects was nanocrystalline. The energy difference (Eg) measured in PL was 2.3 and 2.69 eV respectively for CdSe NCs in chloroform and oleic acid. The structures of the CdSe quantum dots were determined by scanning electron microscopy (SEM). The phase-transfer of chloroform and oleic acid stabilized CdSe nanocrystals solutions was studied for their potentials in white light generation applications.

Abstract: Removal of highly ion-implanted photoresist on the trench-structured GaAs was conducted by mixtures of organic solvents with additives. The ion implanted KrF photoresist on trench-structured GaAs was completely removed at 30 °C when an additive was added to the DMSO+ acetonitrile (AcN) solution. In addition, the removal rate of the implanted photoresist could be increased in DMSO+AcN+additive solution. It was also observed that the DMSO+AcN+additive solution did not cause significant material loss on the GaAs surface during the photoresist removal process.

Abstract: There is much fluorescence for impurities on the variation cashmere fiber surface; the characteristic of the Raman spectrum is not obvious. Based on the orthogonal principle, variation cashmere fiber is purified by soaking in different component water/organic solvents, and cleaning with ultrasonic wave. Through measuring and analyzing the Raman spectrum, we confirm the optimal organic solvent system, soaking time and temperature for the cleanse technology of variation cashmere. The result shows that, the variation cashmere fiber is soaked in diethyl ether/aqueous organic solvent in the optimal condition, the Raman spectrum appears good peak-area ratio, and we get cleanest variation cashmere fiber.

Abstract: 4-(β-sulfatoethylsulfone)-N-ethyl-aniline was synthesized from 4-(β-hydroxyethyl-sulfonyl)-N-ethyl-aniline in the presence of sulfuric acid using toluene and N,N-dimethyl-dodecylamine as mix solvent. The product was efficiently precipitated from the reaction mixture by addition of a sufficient amount of acetone. Several influencing factors on the esterification were investigated, and the results show that, the optimal conditions were: the molar ratio of 4-(β-hydroxyethylsulfonyl)- N-ethyl-aniline, N,N-dimethyl-dodecylamine and sulfuric acid was 1:1:1.5, the dosage of toluene 800 mL per molar 4-(β-hydroxyethylsulfonyl)- N-ethyl-aniline, and the esterification was taken for 9 hours under reflux. Under the optimal conditions, total yield of the product was 85% with the purity of 97%. It was also found that the yield of product can be promoted up to 90 % by using the recycled solvent. The structure of product was characterized by MS.

Abstract: Metallic oxide ZnO short-nanorod of 33-83 nm in diameters and length up to 0.3um.with biological compatibility are environmentally fabricated by organic solvent-assisted annealing pro- cess. The sample was characterized by X-ray diffraction, field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM). It demonstrates that the obtained ZnO short-nanorods have good crystal quality. A growth mechanism is proposed. This paper establish base for application of Metallic oxide short-nanorod to the area of bioscience in our future work.

Abstract: The azeotropic mixture ethyl acetate-ethanol (EA-EtOH) enables effective separation by extractive distillation. The effectiveness of an extractive distillation process depends on the solvent selection, so the single and mixed solvent for separating ethyl acetate-ethanol by extractive distillation were examined. The results showed that the volatility of the ethyl acetate relative to ethanol increased with an increase of the ratio of any given solvent. The selectivity of the mixed solvent is superior to the single solvent. The measured data were correlated well using modified UNIFAC model. Simultaneously, the influence of temperature on solvent selectivity was proposed by using the Clausius-Mosotti equation.

Abstract: The paper studied the effect of different kinds of organic solvents treated polysulfone tubular ultrafiltration membrane on its performances and structure. The results show that the surface of membrane treaded with n-hexane are smoother and less hydrophily, the content of carbon element increased at the same time. On the other hand, the water flux of membrane treated with alkane decrease, but the rejections to MgSO4 and egg protein increase. While the surface of membrane treated with ethanol are rougher and more hydrophily, the contents of carbon and oxygen increase too. The water flux of membrane treated with alcohols increase obviously, but the rejection to egg protein decrease slightly.

Abstract: The removal of ion implanted photoresist (II-PR) after implantation of ultra shallow extension and halo regions is considered as one of the most challenging front-end-of-line (FEOL) processing steps for 32nm and beyond CMOS technology nodes. Commonly used resist strip processes such as fluorine-based dry plasma ash and hot sulfuric/peroxide mixtures induce unacceptable levels of oxidation and material loss [1-.

Abstract: In this study, cellulose extracted from Eucalyptus by ethanol, formic acid and catalyst MIK was used for nano crystal cellulose (NCC) production. The main function of MIK was to protect the structure of cellulose. Kappa numbers, holocellulose and alpha-cellulose contents of the obtained cellulose were calculated and the results showed that this cellulose provided an effective source for NCC. NCC from this material was characterized by Fourier transform infrared, X-ray diffraction and thermogravimetric analysis.

Abstract: Based on the possible leak place on the tank of organic solvent, author had developed three equipments of stopping tank from leaking on the pipeline wall, breaking off between the pipelines or pipeline joint breaking off from tank wholly，which can be stopped tank from leaking as quickly, reliably, conveniently as possible. After simulation test of pressure, three equipments of stopping tank from leaking performed very well, and subjected to atmospheric pressure tank of organic solvent, as a result, these equipments can be used to deal with leaking for solvent tank at emergency case.