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针对化工生产中有机化学知识点“自助餐”的设计 被引量:1
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作者 辛炳炜 张晨韵 +3 位作者 李洪亮 王鲁敏 冯传起 高伟 《广东化工》 CAS 2023年第5期214-216,共3页
有机化工是国家的化工支柱之一。为了使大学教学更好地为实际化工生产服务,有机化学课程采取知识点“自助餐”教学模式,根据化工生产中实际需要的基本知识,以“知识点”为主线,将学习分为“课前、课中、课后”三个阶段,实施线上线下混... 有机化工是国家的化工支柱之一。为了使大学教学更好地为实际化工生产服务,有机化学课程采取知识点“自助餐”教学模式,根据化工生产中实际需要的基本知识,以“知识点”为主线,将学习分为“课前、课中、课后”三个阶段,实施线上线下混合式教学。课前,学生利用在线课程自学,进行知识点的选择性学习和过关自测;课中,教师根据知识点过关率决定课中讲授的内容和授课形式;课后,要求学生进一步线上过关考查。在教学内容中与企业实际生产相结合,用企业的实际问题为教学案例,设计为知识点“自助餐”,在教学改革中具有重要意义。 展开更多
关键词 化工企业实际案例 知识点“自助餐” 线上线下混合式教学 知识体系
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鲁西北地区桑叶多糖低共熔溶剂提取工艺研究 被引量:5
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作者 张盼 辛炳炜 李洪亮 《山东化工》 CAS 2021年第15期1-2,4,共3页
利用氯化胆碱和丙三醇(物质的量比1∶2)形成的低共熔溶剂做溶剂,提取鲁西北霜打桑树叶中的多糖。单因素实验表明,提取桑树叶多糖的最佳条件为DES-30%H_(2)O。用吸光光度仪在490 nm测定多糖的总含量,多糖提取率为10.07%。本工作用低共熔... 利用氯化胆碱和丙三醇(物质的量比1∶2)形成的低共熔溶剂做溶剂,提取鲁西北霜打桑树叶中的多糖。单因素实验表明,提取桑树叶多糖的最佳条件为DES-30%H_(2)O。用吸光光度仪在490 nm测定多糖的总含量,多糖提取率为10.07%。本工作用低共熔溶剂提取桑树叶,不但可以提高提取率而且实现了天然产物的绿色提取。 展开更多
关键词 低共熔溶剂 桑树叶 多糖 鼠李糖
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HSO_3-functionalized Br nsted acidic ionic liquids promote esterification of aromatic acid 被引量:2
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作者 ZHOU FengYan xin bingwei HAO JingCheng 《Chinese Science Bulletin》 SCIE EI CAS 2013年第26期3202-3207,共6页
Esterification of aromatic acid can be promoted via HSO3-functionalized Br nsted acidic ionic liquids (ILs). Under the optimum conditions, using 1-(3-sulfonic acid) propyl-3-methylimidazolium hydrogen sulfate ([MimC3S... Esterification of aromatic acid can be promoted via HSO3-functionalized Br nsted acidic ionic liquids (ILs). Under the optimum conditions, using 1-(3-sulfonic acid) propyl-3-methylimidazolium hydrogen sulfate ([MimC3SO3H][HSO4]) and 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate ([MimC 4 SO 3 H][HSO4 ]) as dual solvent-catalysts, the conversion of esterification of aromatic acid was determined to be more than 90%, indicating that HSO3-functionalized ILs show much better catalytic ability than those of non-functionalized ionic liquids. The separation of desired product was easily performed by extraction with diethyl ether and these HSO3-functionalized ILs could be reused 7 times after vacuum drying. Our data represent an environmentally friendly method for the preparation of aromatic esters. 展开更多
关键词 Bronsted酸 酸性离子液体 酯化反应 芳香酸 硫酸氢铵 甲基咪唑 可重复使用 官能化
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Stable ZnO/ionic liquid hybrid materials: novel dual-responsive superhydrophobic layers to light and anions 被引量:2
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作者 LI HongLiang xin bingwei +1 位作者 FENG Lei HAO JingCheng 《Science China Chemistry》 SCIE EI CAS 2014年第7期1002-1009,共8页
Novel dual-responsive superhydrophobic hybrid materials, ZnO/SAMs (self-assembled monolayers) of ionic liquids (ILs) with different counter-anions (I^-, BF4^-, PF6^- and Tf2N^-), were synthesized and characteriz... Novel dual-responsive superhydrophobic hybrid materials, ZnO/SAMs (self-assembled monolayers) of ionic liquids (ILs) with different counter-anions (I^-, BF4^-, PF6^- and Tf2N^-), were synthesized and characterized. ZnO nanoparticles were first deposited on glass surfaces to produce roughness. Next, SAMs of fluorinated-alkyl-3-(3-triethoxysilylpropyl)-4,5-dihydro-imidazoliumiodide (abb. [C8Ftespim]I) were grafted onto these surfaces via -Si-O- covalent bonds using self-assembly technique. The I- ion could be subsequently exchanged with BF4, PF6-or Tf2N- through a simple aqueous anion-exchange reaction. The ZnO/ILs hybrid layers were characterized by atomic-force microscopy (AFM), scanning-electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Their wettability was estimated through the measurements of static and dynamic contact angles (CAs). Compared to corresponding films of ZnO/[CsFtespim]I with CAs 140.7° ±2.0°, films of ZnO/[CsFtespim]PF6 and ZnO/[CsFtespim]Tf2N showed CAs with 154.0° ± 2.0° and 152.0° ± 2.0°, respectively that remained for a long time. This result suggests that anion-exchange can afford superhydrophobic materials. In addition, the wettability of ZnO/[CsFtespim]X hybrid layers can be reversibly switched by altering ultraviolet (UV) irradiation and dark storage, which shows a photo-induced reversible switch of wettability. The synergistic action of ZnO nanoparticles and SAMs of ILs produced light-anion dual-responsive superhydrophobic materials with ideal stability. 展开更多
关键词 ZnO/IL hybrid materials dual-responsive surface SAMs of ionic liquid wettability ZnO nanoparticles
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