Search

Your search keyword '"Wang, Tongfang"' showing total 16 results
Start Over Author "Wang, Tongfang"
16 results on '"Wang, Tongfang"'

2. Effects of Temperature and NaCl Concentration on the Adsorption of C-S-H Gel in Cement Paste: A Multi-fidelity Molecular Dynamics Simulation

Author

Cao, Jie, Wang, Chao, Wang, Tongfang, Gonzalez-Libreros, Jaime, Tu, Yongming, Sas, Gabriel, Elfgren, Lennart, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ilki, Alper, editor, Çavunt, Derya, editor, and Çavunt, Yavuz Selim, editor

Published
2023
Full Text
View/download PDF

9. Molecular dynamics study on the adsorption of radioactive ions by geopolymers.

Author

Tu, Yongming, Wang, Tongfang, Wen, Rongjia, Cao, Jie, Fang, Mengxiang, Wang, Chao, Sas, Gabriel, and Elfgren, Lennart

Subjects
*RADIOACTIVE waste disposal, *RADIOACTIVE wastes, *CESIUM ions, *MOLECULAR dynamics, *STRONTIUM ions, *CHLORIDE ions, *CESIUM isotopes
Abstract

The construction of nuclear power plants necessitates careful consideration of the discharge and fixation of nuclear waste. Geopolymers are new cement-based materials (CBMs) with three-dimensional cage-like structures that enable effective nuclear waste fixation. In this work, the adsorption of radioactive caesium and strontium ions by sodium aluminosilicate hydrate (NASH) gel, the main component of geopolymers, was investigated using molecular dynamics simulations to obtain nanoscale insights into the ions' interactions with the gel. The formation of strong ion–oxygen bonds allowed both ions to be effectively adsorbed on the NASH surface, but the adsorption ratio of strontium ions (17.2%) was slightly lower than that of caesium ions (21.0%). Because strontium ions are divalent, they can form stronger electrostatic interactions with water molecules and chloride ions, which hinders their approach to the interface. For the same reason, the diffusion coefficient of strontium ions in solution is lower than that of caesium ions. These results provide new insights into the nuclear waste fixation capacity of NASH gel and guidance for the design of new CBMs for radioactive waste disposal. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

15. Simultaneous Determination of Kaempferide, Kaempferol and Isorhamnetin in Rat Plasma by Ultra-High Performance Liquid Chromatography-Tandem Mass Spectrometry and its Application to a Pharmacokinetic Study

Author

Jiang, Zhitao, Wang, Jianchun, Chen, Xiaofeng, Wang, Xue, Wang, Tongfang, Zhu, Zhitao, and Pan, Jinhuo

Subjects
kaempferol, isorhamnetin, kaempferide, pharmacokinetics, Sedumsarmentosum Bunge
Abstract

A selective, rapid and sensitive method using ultra-high performance liquid chromatography was developed and used for the simultaneous determination of kaempferide, kaempferol, and isorhamnetin in rat plasma after oral administration of Sedumsarmentosum Bunge extract. A 6430 triple-quadrupole tandem mass spectrometer in multiple reaction monitoring mode, with a negative electrospray ionization source, was used for the detection. A Waters Symmetry C18 column with isocratic elution (methanol:5 mM ammonium acetate at 75:25, v/v) was used for separation at a flow rate of 0.3 mL min-1. The method was linear for all analytes over the investigated concentration range (r > 0.9900). The intra- and inter-day precisions ranged between 3.88 and 7.74% and the accuracies ranged between 88.63 and 98.74%. The mean recoveries and matrix effect were higher than 85.66 and 92.36%, respectively. All the three compounds tested were stable during storage and analyses. The method was successfully applied to a pharmacokinetic study.

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results