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886 results on '"Chen, Yawen"'

164. Influence of the Passive Layer on Magnetic Beads Detection Sensor Signal

Author

Tan, Xi, primary, Huang, Dandan, additional, Zhao, Mingyang, additional, Cheng, Qionglin, additional, Chen, Yawen, additional, Li, Hairong, additional, Ren, Yaqian, additional, Yi, Ming, additional, Ding, Qi, additional, Zuo, Xianwei, additional, Wang, Yang, additional, Song, Yuzhe, additional, Lu, Qihai, additional, and Han, Genliang, additional

Published
2023
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182. Synthesis and Characterization of an Amphoteric Asphalt Emulsifier

Author

Laishun Shi, Chen Yawen, Jingqiu Ma, Ji Tong, and Xiaomeng Yu

Subjects
Chemical engineering, Chemistry, Asphalt, General Chemical Engineering, General Chemistry, Condensed Matter Physics, Characterization (materials science)
Abstract

A novel amphoteric asphalt emulsifier of octadecylbis(propanamide)-(3’-sodium phosphate-2’-hydroxypropyl)ammonium chloride was synthesised from the raw materials octadecylamine, acrylamide, epichlorohydrin and sodium dihydrogen phosphate. The tertiary amine octadecyl-bis(propanamide) was synthesised from octadecylamine and acrylamide (step 1). Sodium 3-chloro-2-hydroxypropyl phosphate (intermediate) was obtained from epichlorohydrin and sodium dihydrogen phosphate (step 2). The asphalt emulsifier was obtained from octadecyl-bis(propanamide)-tertiary amine and the intermediate by quaternisation reaction (step 3). The yield of the final product reached 94.90%. The structure was identified by FTIR, 1H-NMR and elemental analysis. The critical micelle concentration of the product is 1.46 × 10–5 mol L–1. The surface tension at CMC is 37.78 mN ν–1. The saturated adsorption amount of asphalt emulsifier is 2.72 × 10–3 mmol ν–2. The occupied area per asphalt emulsifier molecule at CMC is 0.611 nm2 mol–1. The surfactant is a fast-setting asphalt emulsifier.

Published
2021

183. Synthesis and surface properties of amide-based amphoteric surfactants with different hydrophobic carbon chain length

Author

Laishun Shi, Xuedi Gong, Chen Yawen, and Ji Tong

Subjects
Surface tension, chemistry.chemical_compound, Aqueous solution, chemistry, Chemical engineering, Amide, Acrylamide, Critical micelle concentration, General Chemistry, Raw material, Conductivity, Sodium chloroacetate
Abstract

A series of novel amphoteric surfactants containing amide groups with different hydrophobic carbon chain lengths were synthesized by using fatty amines with different carbon chain lengths, acrylamide and sodium chloroacetate as raw materials. The surface performance parameters and the thermodynamic functions of the surfactants in aqueous solution with different hydrophobic carbon chain length were determined and analyzed by the surface tension and conductivity. The surfactants were started to form pre-micellization before reaching the critical micelle concentration in the solution from the molar conductance-concentration squared curve and the apparent activation energy-concentration curve. According to the water separation time and the foaming performance experiments, as the hydrophobic carbon chain length grows, the emulsifying ability and defoaming property become better. The surfactants synthesized from octadecylamine belong to rapid-set emulsifier of asphalt.

Published
2021

191. Stability of selenium and its speciation analysis in water using automatic system separation and HR-ICP-MS measurement

Author

Yang, Junqiang, primary, Chen, Yawen, additional, Shi, Keliang, additional, Hu, Kesheng, additional, Li, Run, additional, Gao, Xiaoqing, additional, Wang, Qian, additional, Zhang, Weibo, additional, Zhou, Yun, additional, Wang, Yanyun, additional, He, Jiangang, additional, Liu, Tonghuan, additional, and Hou, Xiaolin, additional

Published
2022
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199. Hypercube Communications on Optical Chordal Ring Networks with Chord Length of Three

Author

Chen, Yawen, Shen, Hong, Zhang, Haibo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Jesshope, Chris, editor, and Egan, Colin, editor

Published
2006
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