甲烷水合物在纯水中的生成动力学

引言一些低分子量气体,如石油和天然气中C_1～C_4轻烃、氮气、硫化氢、二氧化碳和惰性气体等,在一定压力和温度的条件下可与水形成一类笼形结构的冰状晶体,即所谓的气体水合物．气体水合物是一类较为特殊的包络化合物：主体水分子通过氢键相互结合形成一种内含空隙的笼形框架,客体分子则被笼罩于这些空隙中．主、客体分子之间的作用力为vanderWaals力．水合物晶体最为常见的两种结构分别称为结构I（体心立方构型）和结构Ⅱ（金刚石构型）．甲烷和水形成结构I水合物．文献阐述了开展水合物生成动力学研究的重要意义．但由于水合物生成…     

杀菌剂咪鲜安的性质及合成

阐述了新型咪唑类杀菌剂咪鲜安的用途、物理及化学性质、毒性及制剂等概况,详述了以三氯苯酚为起始原料经醚化、胺化、酰化合成咪鲜安的各步工艺条件和操作方法。咪鲜安及其中间体的化学结构经１ＨＮＭＲ、ＩＲ和元素分析确认     

全日制工程硕士创新型实践教学的探索

围绕为制药领域培养基础扎实、素质全面、工程实践能力强并具有一定创新能力的应用型、复合型高层次工程技术和工程管理人才的培养目标,我们在课程设置、实践教学环节等方面研究和探索全日制工程硕士专业学位研究生教育培养模式,以适应国家研究生培养类型和模式改革。     

氢氧化物阻燃剂在聚乙烯中的应用技术和研究进展

综述了近年来国内外氢氧化物阻燃聚乙烯的研究现状及其应用技术进展,简要评价了阻燃技术的发展趋势。     

Isoparaffin production by aqueous phase processing of sorbitol over the Ni/HZSM-5 catalysts: Effect of the calcination temperature of the catalyst

Ni/HZSM-5 catalysts calcined at different temperatures were used in the isoparaffin production by aqueous phase processing of sorbitol and characterized by N₂ physical adsorption, temperature-programmed reduction (H₂-TPR), temperature-programmed desorption of ammonia (NH₃-TPD) and Raman techniques. The effect of calcination temperature of the catalysts on the catalytic performance for the reaction was investigated. The activity test results indicated that the maximal i-C₆H₁₄ selectivity of 45.4% and the total i-C₆H₁₄ and i-C₅H₁₂ yield of 32.3% were obtained over the catalyst calcined at 500 °C, which exhibited the optimum surface area and pore structure with 100% of the reducibility of Ni species on the surface of HZSM-5. In addition, the amount and the strength distribution of acidic surface sites of the catalyst decreased with the increase of calcination temperature at 500 °C above. All these factors result in an increase in the formation of isoparaffin.     

流态粉煤灰室内试验研究

研究了水泥掺量对流态粉煤灰流动性及力学性能的影响.结果表明.在同样的水灰比条件下,流态粉煤灰的流动性随水泥掺量增加而降低;流态粉煤灰强度随水泥掺量的增加而增加.在水泥掺量<6.00%的情况下,流态粉煤灰强度随着龄期发展增长并不明显,>6.00%时,流态粉煤灰强度随着龄期发展快速增加.     

雷达吸波涂料用混合环氧树脂固化动力学研究

采用傅里叶红外光谱法(FT-IR)和示差扫描量热法(DSC)对雷达吸波涂料用混合型环氧树脂的固化反应历程进行了研究.由温度-升温速率外推法确定了该体系的起始固化温度、峰顶固化温度和终止固化温度为分别为60.55℃、97.0℃和131.79℃,为固化工艺的确定提供了依据;由Kisserger方程求得共聚体系固化反应的表观活化能为65.6kJ/mol;根据Crane理论求得固化反应级数为0.91,接近于1级反应;通过Arrhenius公式求得不同升温速率下固化反应的速率常数K,随着升温速率的升高,K值由0.276增大到0.983,反应速度显著加快.     

Fabrication of highly porous biodegradable monoliths strengthened by graphene oxide and their adsorption of metal ions

Ordered porous chitosan–gelatin/graphene oxide (CGGO) monoliths with over 97% porosity were prepared by a unidirectional freeze-drying method and used as adsorbents for metal ions. They were characterized by X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. In addition, their water absorption, wet-state stability and compressive strength were measured. The adsorption behavior of the CGGO monoliths and influencing factors such as pH, graphene oxide (GO) concentration, metal ion concentration as well as the effect of ethylenediaminetetraacetic acid (EDTA) were investigated. The incorporation of GO significantly increased the compressive strength of the CGGO monoliths in both their wet and dry states, and changed their porous structure. They exhibited an extremely high adsorbing ability for metal ions, which decreased at low pH, but increased from 20% to 88% upon the addition of EDTA at low pH. The CGGO monoliths have good stability and can be recycled several times with only a slight loss in adsorption ability. In addition, they are biodegradable, non-toxic, efficient and regenerable.     

Fabrication of dendritic silver nanostructure using an integration of holographic lithography and electrochemical deposition

Holographic lithography in combination with electrochemical deposition provides a novel and readily controlled method for preparing dendritic three-dimensional silver nanostructure with a large surface area. The scanning electron microscope and the synchrotron radiation X-ray three-dimensional imaging technique are used to characterize the as-prepared silver nanomaterial and demonstrate that the obtained silver has a three-dimensional dendritic morphology. The observed typical widths between the neighbor branches of the dendritic silver nanostructure are 30–50 nm. The configuration of the silver nanostructure is greatly related to the width of gold wires which are fabricated using holographic lithography and serve as substrate of the silver nanostructure. The three-dimensional silver architecture is formed only when silver is electrochemically deposited on 400-nm-width gold.     

制药工程专业实验教学改革的探索与实践

围绕制药工程专业的人才培养目标,结合学校制药工程专业教学的实际情况,从创建实验教学平台、构建实验教学体系、提高教学质量、推进实验教学开放等方面对制药工程专业实验教学改革进行探讨,旨在培养学生综合能力,为制药工程专业发展提供参考。