Papers by Keyword: Solvothermal Method

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Authors: Meng Lv, Guo Chao Li, Jie Dai, Xia Li
Abstract: In this study, Y2O3 microspheres have been selectively prepared by solvothermal method, without using any template and catalyst carrier. Based on the systematic analysis of the samples, we have discussed the effects of the thermal treatment temperature on the structure of the Y2O3 microspheres. Besides, we have also investigated the effect of microstructure on the photoluminescence properties of the phosphor, and the impact of rare earth ion doping concentration on the emission intensity of the phosphor. Powder X-ray diffraction analysis of the powders confirmed the formation of cubic Y2O3. Scanning electron microscope observation reveals that the as-synthesized powders are spherical particles of diameter of approximately 3 μm at 180 °C. Photoluminescence measurements indicate that the phosphor exhibits strongest emission peak at 612 nm, corresponding to the 5D0-7F2 electric-dipole transition. In addition, highest luminescence efficiency was observed in the phosphor with the rare earth ion doping concentration of 5%.
Authors: Yong Hui Liu
Abstract: Polymerase chain reaction (PCR) and fluorescence quantitative polymerase chain reaction (qRT - PCR) is a major means of detection of genetically modified food, whose key is to extract high quality nucleic acid in quick and high flux. The main nucleic acid extraction method is hexadecyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) and kits. Because operation of CTAB and SDS method are cumbersome, require the use of organic solvent and centrifugal unceasingly, thus can not meet the requirement of the rapid development of high throughput; and because of the high price of kit method, its application in the daily inspection is also limited. At the same time, the development trend of genetically modified detection based on nucleic acid level is multiple tests; the key is the preparation of different kinds of fluorescent microspheres and specific probe of microspheres. To solve above problems, this paper put forward nucleic acid extraction method on the basis of the magnetic separation technology.
Authors: Pongthep Jansanthea, Pusit Pookmanee, Sirirat Phaisansuthichol, Sakchai Satienperakul, Supaporn Sangsrichan, Ratchadaporn Puntharod, Sukon Phanichphant
Abstract: Bismuth vanadate (BiVO4) powder was synthesized via the solvothermal method at 100200 °C for 26h by using acetic acid as solvent without calcination steps. The phase transition of BiVO4 powder was studied by Xray diffraction (XRD). The morphology and chemical composition of BiVO4 powder were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The functional groups of BiVO4 powder was identified by Fourier transform infrared spectroscopy (FTIR).
Authors: Satoshi Wada, Ai Nozawa, Shogo Iwatsuki, Tetsuo Kuwabara, Takahiro Takei, Nobuhiro Kumada, Petr Pulpan, Hiroshi Uchida
Abstract: Barium titanate (BaTiO3, BT) and strontium titanate (SrTiO3, ST) nanocube particles were prepared by a solvothermal method. The prepared particles were collected by a centrifugal separator. The X-ray diffraction (XRD) measurement and a transmittance electron microscope (TEM) observation confirmed the formation of perovskite BT and ST nanocube particles with sizes of around 17 nm. These nanocube particles were monodistributed in hexane with tri-n-butylphosphine oxide (TBPO) as dispersant, separately, and then, the accumulations composed of the BT and ST nanocubes were built up using a selective catalytic reaction between 3-bromopropylphosphonic acid (BP) and aminomethylphosphonic acid (AM) as smart glue. The TEM observation confirmed that a part of accumulations showed a hetrointerface connection between BT and ST.
Authors: Ya Juan Cheng, Xue Chen Duan, Yang Lin Liu, Bo Jiang, Gui Ying Xiao, Zhi Chao Zhou
Abstract: Indium tin oxide (ITO) nanopowders with high crystalline were synthesized by a simple solvothermal method with isopropanol as the selected solvent. X-ray diffraction was employed to characterize the crystal structure and crystalline size while the effect of the reaction time on morphologies was studied by FE-SEM. The results revealed that, with the increase of solvothermal time, the morphologies were evolved gradually from porous plates with high specific surface area to rods with narrow diameter distribution. The solvothermal time has little effect on crystalline size, which is 18nm approximately for all the samples. With the increase of solvothermal time, the electric conductivity decreases slightly first and then increases greatly. The possible mechanisms for the effect of solvothermal time on ITO powder morphologies and electric conductivity are proposed.
Authors: You Rong Wang, Peng Chen, Xian Wang Zhang, Jia Wang, Si Qing Cheng
Abstract: The development of new electrode materials with high storage capacity is indispensable for improving rechargeable lithium batteries. Herein, high performance TiO2 microspheres have been fabricated by a facile solvothermal method. The obtained TiO2 microspheres were investigated by the measurements of X-ray diffraction pattern, scanning electronic microscopy, and electrochemical tests. As the rates increase from 1C to 20C, the TiO2 composites display high discharge capacities of 414.6 mAh g-1 for the first cycle at 1 C and 244.6 mAh g-1 at 20 C over 100 cycles. CV experiments indicate that there are two peculiar pairs of cathodic/anodic peaks occurred in the range of 1.0-3.0V, which clearly demonstrates that the structure of the TiO2 microspheres here is quite different from the ordinary anatase TiO2. Excellent rate capability and cycle ability are ascribed presumablely to the unique structure.
Authors: Qing Song Jiang, Jian Gao, Hai Feng Yuan, Lu Rong Ding, Lin Yi
Abstract: In this paper, pyrochlore-like Na2Ta2O6 nanocrystals have been successfully synthesized in mixed solvents (water-ethanol) by a single-step and low-temperature solvothermal method. During the synthesis process, tantalum chloride and sodium hydroxide are used as starting materials; diethanolamine is acted as a stabilizer. The influence of alkaline concentration, reaction temperature and time on the crystallinity and morphology of Na2Ta2O6 nanocrystals is investigated in detail. The samples are characterized by X-ray diffraction and transmission electron microscope. The results show that the pure-phase pyrochlore-like Na2Ta2O6 nanocrystals can be formed with 10.5 mmol sodium hydroxide at 353K for 12 h.
Authors: Hua Huang, Hai Hu Yu, Ling De Zhou, Er Dan Gu, De Sheng Jiang
Abstract: Hybrid Graphene-ZnS nanopaticles (G-ZnS NPs) were prepared by using a solvothermal method. A dispersion of graphite oxide (GO) and zinc acetate dihydrate (Zn(CH3COO)2.2H2O) in dimethl sulfoxide (DMSO) reacted at 180 °C for 12 h in a Telfon-lined stainless steel autoclave. In the reaction, DMSO serves as a sulphide source as well as a reducing agent, resulting formation of the hybrid G-ZnS NPs in one-step. Hybrid G-ZnS NPs were characterized by using a powder X-ray diffractometer, a Fourier-transform infrared spectrometer, a transmission electron microscope, a UV-vis spectrophotometer and a fluorescence spectrophotometer, respectively. In the FTIR spectra, the GO related stretching bands of C-O and carboxyl groups are not observed in the spectra of G-ZnS, suggesting that the GO sheets were reduced to graphene sheets. In the TEM images, it is observed that the ZnS nanoparticles with an average size of 23 nm are attached onto the graphene sheets. The UV-vis absorption spectrum of the G-ZnS NPs dispersed in ethanol has an absorption peak of G at 261 nm and a weak shoulder of ZnS NPs around 320 nm. The broadening and weakening of the peak of ZnS NPs at 320 nm arises from the interparticle coupling effect. Under excitation at 225 nm, a peak around 386 nm and other weaker bands appear in the fluorescence spectrum of the G-ZnS. The band at 386 nm is attributed to zinc vacancies.
Authors: Cheng Mei Liu, Yu Xia Zhao, Jin Dong, Lu Hai Li, Yen Wei, Lu Han
Abstract: Using iron-oleate complex as a precursor, oleic acid as a stabilizer and 1-octadecene as a reductant, uniform-sized and highly monodisperse iron oxide nanoparitcles with different diameters were successfully synthesized via solvothermal method by changing reaction time. Transmission electron microscope (TEM), thermo-gravimetric analysis (TGA), fourier transform infrared spectroscopy (FT-IR), physical property measurement system (PPMS) and dynamic light scattering (DLS) was used to characterize obtained iron oxide nanoparticles. These results indicated that iron oxide nanoparitcles with the diameter ranging from 4 to 8 nm can be controllably synthesized.
Authors: Huan Xiang Li, Gong Yi Li, Tian Jiao Hu, Xiao Dong Li, Yun Quan Yang
Abstract: A solvothermal method was developed to synthesize silicon carbide nanoflakes and nanowires through pyrolysis of polymethylsilane (PMS) at 550 °C in solution. Evidences from HRTEM, SAED, FTIR and XPS indicated that the products were amorphous nanostructures which mainly consisted of Si, C elements and trace amount O element. Owing to concrete quantum confinement effects, the unique nanostructures have strong photoluminescence centered at 410-430 nm under excitation wavelength of 350 nm
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