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Preparation of ultrafine chitosan particles by reverse microemulsion

China Particuology 2007年第6期5卷 384-390页

作者： guogen liu Lei Shao Fei Ge Jianfeng Chen Key Lab for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 100029 China Research Center of Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology Beijing 100029 China

Ultrafine chitosan particles were prepared by reverse microemulsion consisting of water, Triton X-100, octanol and cyclohexane. Two methods of preparing ultrafine chitosan particles were adopted and compared using TEM and IR, and possible mechanisms for the formation of ultrafine chitosan particles were proposed. Experimental results show that the method which combined ionic gelation and cross-linking gave uniformly sized chitosan nanoparticles with an average diameter of 92 nm, while the cross-linking without ionic gelation produced spindly chitosan particles with an average length of 943 nm and width of 188 nm.

关键词： Chitosan Ultrafine particles Microemulsion

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基于形态仿生理念的沙漠路基边坡结构设计与研究

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干旱区资源与环境 2024年第4期38卷 95-104页

作者：惠迎新刘俊绿许鹏范龙文喻国根宁夏大学土木与水利工程学院银川750021 宁夏交通建设股份有限公司银川750004 宁夏道路养护工程技术研究中心银川750004

为减少沙漠地区公路路基积沙,寻求一种输沙性能优异的路基边坡结构形式。受沙丘在自然状态下形成独特结构的启发,以新月形沙丘作为仿生研究对象,运用仿生学设计理念构建沙漠地区适宜路基边坡结构形式。基于沙丘形态统计特征,建立仿沙丘... 详细信息

为减少沙漠地区公路路基积沙,寻求一种输沙性能优异的路基边坡结构形式。受沙丘在自然状态下形成独特结构的启发,以新月形沙丘作为仿生研究对象,运用仿生学设计理念构建沙漠地区适宜路基边坡结构形式。基于沙丘形态统计特征,建立仿沙丘表面路基理论数学模型和有限元数值仿真模型,分析不同边坡形态下风、沙流相互影响特性,并对仿沙丘路基边坡结构形式进行优化,提出一种适用于沙漠地区的仿生路基边坡结构。研究表明:路基边坡结构形态不同会影响路基周围气流场,相对常规直线形路基边坡结构而言,仿沙丘形路基边坡结构在迎风坡、路面和背风坡速度恢复优势明显,可使沙粒获得更大动能,加速沙粒通过路基,降低沙粒在路基周围沉积。优化后的凹曲线形仿沙丘路基边坡结构积沙与路面沙粒体积分数均显著降低,可使风沙流快速通过路基,并便于施工,具有良好的输沙能力。研究成果可为沙漠地区公路安全运营和路基边坡结构设计提供参考。

关键词：沙丘仿生设计路基边坡风沙两相流流场分布

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THE EXTRACTED COMPLEX FORMED BY MONO (2-ETHYLHEXYL)-2-ETHYLHEXYL PHOSPHATE WITH DIVALENT Mn

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Acta Metallurgica Sinica(English Letters) 1992年第7期5卷 16-20页

作者： HUANG Kelong SHU Wanyin DING Dunhuang liu guogen DONG Ping, Central South University of Technology, Changsha, China HUANG Kelong, Lecturer, Department of Chemistry, Central South University of Technology, Changsha 410083, China

In order to clarify the mechanism and the complex formed in the extraction of divalent Mn by alkylphosphonic acid monoester, the solid complex has been prepared by mono (2-ethylhexyl)-2-ethylhexyl phosphate, HEH(EH)P, HA with divalent Mn. The elemental analysis, magnetic susceptibility and thermogravimetry have been determined for the solid complex of HEH(EH)P-Mn(II) and the infrared spectrum has been carried out in comparison to the extractant HEH(EH)P. The extracted compound has also been studied by electronic and electron spin resonance spectroscopy in octane solvent and solid state at room temperature. On the basis of the measurements, it is concluded that the structure of the solid polymeric species MnA_2 is in a tetrahedral arrangement.

关键词： solvent extraction mono (2-ethylhexyl)-2-ethylhexyl phosphate Mn extracted complex

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