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氨系水相优化合成CdTe量子点的研究 被引量:2
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作者 林谦 苏英 陈秀宇 《宁德师范学院学报(自然科学版)》 2012年第4期337-341,共5页
用巯基丙酸(MPA)作稳定剂,无需氮气或氩气保护下,在氨系水相中通过超声合成CdTe量子点的前驱体,前驱体经水浴回流制备粒径可调的CdTe量子点.通过荧光和吸收光谱、透射电子显微镜和红外光谱对产物进行了表征.试验表明:反应时间、温度、p... 用巯基丙酸(MPA)作稳定剂,无需氮气或氩气保护下,在氨系水相中通过超声合成CdTe量子点的前驱体,前驱体经水浴回流制备粒径可调的CdTe量子点.通过荧光和吸收光谱、透射电子显微镜和红外光谱对产物进行了表征.试验表明:反应时间、温度、pH值、Cd2+、HTe-、MPA的物质的量比,对量子点的粒径大小、粒径分布和粒径生长速度均有很大的影响.n(HTe-)∶n(Cd2+)∶n(MPA)=1:3:6,pH=9.8条件下合成前驱体,在92±1℃水浴下回流,可以快速获得长波长、高荧光的CdTe量子点,合成的量子点储存6个月后经稳态/瞬态荧光光谱仪测定,外量子效率仍为16.45%. 展开更多
关键词 CDTE量子点 巯基丙酸 氨系水相
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Effects of Hydrophobicity of Ethylene Oxide-Propylene Oxide Copolymers on Phase Diagrams of Aqueous Two-Phase Systems and Partition Behaviors of Cephalexin and 7-Aminodeacetoxicephalos-poranic Acid
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作者 朱建航 魏东芝 曹学君 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第2期240-243,共4页
A series of ethylene oxide (EO)-propylene oxide (PO) randomco-polymers (EOPO) were used to form aqueous two-phase systems (ATPS)with ammonium sulfate. Effects of EOPO's properties on the phaseseparation behaviors ... A series of ethylene oxide (EO)-propylene oxide (PO) randomco-polymers (EOPO) were used to form aqueous two-phase systems (ATPS)with ammonium sulfate. Effects of EOPO's properties on the phaseseparation behaviors and on the partition of cephalexin and7-aminodesacetoxicephalosporanic acid (7-ADCA) in ATPS wereinvestigated. Both the molar mass and molar ratio of EO to PO of EOPOcould greatly influence partition behaviors of cephalexin and 7-ADCAas well as the binodal curve of ATPS. 展开更多
关键词 ethylene oxide (EO) and propylene oxide (PO) random co-polymer (EOPO) aqueous two-phase sys-tems partition coefficient phase diagram
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