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5 results on '"Li-Mei Dai"'

1. Preparation, Characterization and Conductivity of Solid High-Proton Conductor Na7[CoW11O39Cd(H2O)]·12H2O

Author

Ming Xia Zhu, Xiu Mei Lin, Li Qiang Chen, and Li Mei Dai

Subjects
Keggin structure, chemistry.chemical_compound, X-ray photoelectron spectroscopy, chemistry, Proton, General Engineering, Analytical chemistry, Infrared spectroscopy, Activation energy, Inductively coupled plasma, Conductivity, Proton conductor
Abstract

A new solid high-proton conductor Na7[CoW11O39Cd (H2O)]·12H2O has been synthesized for the first time. The percentage composition of the product were determined by Inductively coupled plasma (ICP) and X-ray photoelectron spectroscopy (XPS). The product was characterized by infrared spectroscopy (IR) and X-ray diffraction (XRD), which indicate it possesses the Keggin structure. The TG-DTA curve shows the sequence of water loss in the compound, the amount of the loss, as well as the thermostability. Conductivity of the compound was investigated by four-electrode method at room temperature and different measuring temperatures, the results reveal that its proton conductivity is 4.87×10−4S·cm-1at 27oC and the activation energy for proton conduction is 15.31 kJ/mol.

Published
2014

2. A new pure Mo-oxide-based organic–inorganic hybrid framework templated by vanadium-substituted Keggin anions

Author

Li Jun Qi, Li Mei Dai, Enbo Wang, Yang Guang Li, Wan Sheng You, Jing Tang, and Xiu Li Bai

Subjects
Materials science, Inorganic chemistry, Oxide, chemistry.chemical_element, Vanadium, Electrochemistry, Inorganic Chemistry, chemistry.chemical_compound, Crystallography, chemistry, Molybdenum, Elemental analysis, Polyoxometalate, Materials Chemistry, Hydrothermal synthesis, Physical and Theoretical Chemistry, Powder diffraction
Abstract

A new polyoxometalate-templated pure Mo-oxide-based organic–inorganic hybrid framework with parallelogram grids has been hydrothermally synthesized and characterized by elemental analysis, IR, TG, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. Its electrocatalytic property was investigated.

Published
2010

3. A new polyoxometalate-templated Mo/V-oxide-based organic-inorganic hybrid framework with a honeycomb-like structure.

Author

Li-Mei Dai, Wan-Sheng You, Yang-Guang Li, En-Bo Wang, and Cui-Ying Huang

Subjects
*POLYOXOMETALATES, *HYBRID systems, *ORGANIC compounds, *HONEYCOMB structures, *MOLECULAR structure, *CHEMICAL templates, *METALLIC oxides, *ELECTROCATALYSIS
Abstract

A new polyoxometalate-templated Mo/V-oxide-based organic- inorganic hybrid framework with a honeycomb-like structure has been hydrothermally synthesized and its electrocatalytic property was investigated. [ABSTRACT FROM AUTHOR]

Published
2009
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4. A new molybdenum-oxide-based organic–inorganic hybrid framework templated by double-Keggin anions.

Author

Yang-Guang Li, Li-Mei Dai, Yong-Hui Wang, Xin-Long Wang, En-Bo Wang, Zhong-Min Su, and Lin Xu

Subjects
*MOLYBDENUM oxides, *MOLYBDENUM compounds, *ANIONS, *ELECTROCATALYSIS
Abstract

A new double-Keggin-ion-templated, molybdenum-oxide-based organic–inorganic hybrid compound has been hydrothermally synthesized and its electrocatalytic properties investigated. [ABSTRACT FROM AUTHOR]

Published
2007
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5. [Application of factor analysis to evaluate deformation behaviors of frequently-used tablet excipients].

Author

Li XH, Li MD, Du Y, Zhao LJ, Feng Y, Xu DS, and Ruan KF

Subjects
Factor Analysis, Statistical, Particle Size, Powders chemistry, Pressure, Tablets, Chemistry, Pharmaceutical methods, Compressive Strength, Elasticity, Excipients chemistry, Pharmaceutical Preparations chemistry
Abstract

The present work is to investigate the correlation between physical properties and deformation behaviors of tablet excipients, and rank them according to their plastic performances during compaction. The excipients selected were compacted using Korsch XP1 after measuring their physical properties where the compression parameters for evaluating deformation behaviors were Heckle equation, compression work and elastic stretch in die. The correlations between compaction descriptors and physical parameters were analyzed by canonical correlation analysis, and factor analysis was simultaneously employed to synthetically assess deformation behaviors for all our samples. The canonical variables show that true density (Pa) correlated negatively with plastic coefficient (PL) and positively with yield pressure (YP); compression degree (Cp) correlated negatively with fast elastic stretch (FES) as well as YP and positively with PL. When factor scores were used in combination with original data, the plasticity of our samples was sorted and ranked as high (-0.56 < F' < 0.21), intermediate (-0.16 < F' < 0.36), or low (0.38 < F' < 0.84), which are in accord with plasticity rankings previously reported in literature. This study indicates factor analysis can be an approach to evaluate deformation behaviors of pharmaceutical powders.

Published
2013

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