The synthesis and characterization results of cationic Gemini surfactants indicated that, first, there exists quaternary ammonium structure in the molecules of sample synthesized in lab by 红外光谱法 method, second, NMR method verified the existence of Gemini structure in the molecules of sample synthesized in lab, last, through the two methods mentioned above, the samples synthesized are sure to be object product, that is, cationic Gemini surfactants.
A traditional pressure method and isostatic pressure method were employed to prepare the samples. A middle process was improved during solid-state reaction in order to enhance the properties of the samples synthesized.
With comparing the samples synthesized by microwave method with the samples synthesized by hydrothermal method and room-temperature method, we found that the sample synthesized by hydrothermal method had the biggest pore diameter(3.1nm), the smallest BET surface(709 m~2·g~(-1)), and the best stability;
The results showed that as compared with the samples synthesized by hydrothermal method, the samples synthesized under microwave radiation conditions exhibited better physical-chemical properties, slightly higher etherification activity and improved stability, furthermore, the crystallization time was much shorter and less organic template was used during the synthesis.
METHODS: The effects of the concentration of buffer and hydropropyl-β-cyclodextrin ( HP-β-CD), pH, running voltage and capillary temperature on the enantioseparation of 1,2-diphenyl-1,2-ethanediol were investigated by CE. Enantiomeric excesses of 4 samples synthesized by asymmetric dihydroxylation were investigated and the results determined by CE method were then evaluated by comparison with those by HPLC.
The results show that the contents of Mn2+, Mn3+ and Mn4+ of the samples synthesized at different conditions are different and as a result there are different average valence of manganese.
At last, the superconducting transition temperature of the samples synthesized bytwo methods were measured, and the results showed that their Tc were about 39 K.
最后，对传统无压烧结和放电等离子两种方法制备的样品的超导转变温度进行了测量，结果表明，两种方法合成的样品的超导转变温度均在 39 K 左右。
Impurity was found in the samples synthesized at 550癈 or the temperature lower than that, while the crystalline size of the samples synthesized at 700℃ was too big, both two factors caused the capacity loss.
The XRD analysis indicates that the samples synthesized from 3TiH2-B4C have TiB2 and TiC phases, while those from 11TiH2-3B4C have not only TiB2 and TiC phases, but also Ti3B4 phase.
LiFePO4/C samples synthesized at 650 ℃、700 ℃ and 750 ℃ for 15 h possess good electrochemical performance, and the sample synthesized at 750 ℃ is the best.
Compared with the content before samples (synthesized), it can be concluded that the content of Eu in the SrAl_2O_4:Eu~(2+), Dy~(3+) phospher samples synthesized by high temperature solid phase reaction has an obvious increase.
Compared with the La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_3 synthesized by the conventional solid state reaction method, samples synthesized by the citrate method exhibits better sintering activity and electrical conductivities.
The mesoporous samples synthesized in ethanol solvent by using this evaporation method showed a fully disordered pore system, but those obtained in the hydrothermal synthesis had highly ordered pores.
All of the zirconium silicalite-1 samples synthesized were active for the 2-butanol oxidation, but activities obtained using ZS-1 catalysts were lower than TS-1 catalyst.
The parameters of the cell and interatomic distances were determined in all the samples synthesized.3.The IR and electronic spectra of sulfofluorides of the rare earth metals of the cerium group were taken and interpreted.
Knoop microhardness also increased with the heating time and was larger in samples synthesized from titanium alkoxides than zirconium alkoxides.
After a thermal treatment at 125°C for 120 h, E was around 3-5 and 1-2 GPa for the samples synthesized with titanium butoxide or zirconium butoxide, respectively.
A significant improvement has been made to the method previously proposed[3] for synthesizing FeMo-co modeling compounds. With the use of ethylene glycolate anion as labilizable blocking agent (hydrolyzable bidentatc chelating ligand)to protect two neighboring coordination sites in the first coordination sphere of MoIV(III) of the synthesized FeMo-co modeling compound, an increase in reconstituted-nitrogenase activity of 2 orders of magnitude of the sample synthesized (as compared with the...
A significant improvement has been made to the method previously proposed[3] for synthesizing FeMo-co modeling compounds. With the use of ethylene glycolate anion as labilizable blocking agent (hydrolyzable bidentatc chelating ligand)to protect two neighboring coordination sites in the first coordination sphere of MoIV(III) of the synthesized FeMo-co modeling compound, an increase in reconstituted-nitrogenase activity of 2 orders of magnitude of the sample synthesized (as compared with the use of acetoni-trile or other monodentate ligands as blocking agents) has been obtained. Catalytic activity and selectivity assays as well as preliminary characterization by EPR method have also been made.
Ten columns of various stationary phases were screened for the gas chromatographic separation of the impurities and muscone synthesized by three different routes. It was found that non-polar phases such as DC-200 were suitable for the separation of muscone and cyclopentadecanone; phases with low polarity, e. g. OV-17, were good for separating muscone and 3-methylcyclopentadecenone, while OV-17 columns of 4～5 m long was necessary for the separation of muscone and 4-methylcyclopentadecanone. The overall resolution...
Ten columns of various stationary phases were screened for the gas chromatographic separation of the impurities and muscone synthesized by three different routes. It was found that non-polar phases such as DC-200 were suitable for the separation of muscone and cyclopentadecanone; phases with low polarity, e. g. OV-17, were good for separating muscone and 3-methylcyclopentadecenone, while OV-17 columns of 4～5 m long was necessary for the separation of muscone and 4-methylcyclopentadecanone. The overall resolution efficiency K_1 of these columns have been calculated and its relationship with McReynolds constants discussed.n-Nonadecane was chosen as the internal standard for the quantitative determination of muscone, the calibration factor was calculated. Analytical results of samples of five different batches are reported.The impurities in samples synthesized by route A were studied in detail by GC, GC-MS, UV and IR, they were identified as α,β-3-methylpentadecenone and a nonconjugated 3-methylpentadecenone, and the constants of these compounds were determined. The cause of producing these impurities was discussed, which should be of help to the synthetic work.
Adsorption isotherms of benzene and water on ZSM-5 zeolite were determined gravimetrically in vacuum with a quartz spring balance in temperature range of 20-300℃and 20-200℃ respectively. The adsorption behavior for water vapour of the zeolite samples synthesized with and without organic amine were compared. A discussion of the applicability of TVFM to zeolite-vapour systems was also given. For systems of ZSM-5-C8H6 and ZSM-5-H2O, adsorption equilibrium equations in which values n are 1.3 and 0.9 respectively...
Adsorption isotherms of benzene and water on ZSM-5 zeolite were determined gravimetrically in vacuum with a quartz spring balance in temperature range of 20-300℃and 20-200℃ respectively. The adsorption behavior for water vapour of the zeolite samples synthesized with and without organic amine were compared. A discussion of the applicability of TVFM to zeolite-vapour systems was also given. For systems of ZSM-5-C8H6 and ZSM-5-H2O, adsorption equilibrium equations in which values n are 1.3 and 0.9 respectively were presented. Adsorption isotherms calculated over a wide range of temperature and filling and the pore volume of zeolite thus determined are in good agreement with the experimental data.
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