Preparation and Characterization of Sol-Gel Derived Au Nanoparticle Dispersed Y_2O_3∶Eu Films

Nano sizedmetalsandsemiconductorsplayim portantrolesinvariousareas.Inthelastdecade,they havebeenextensivelystudiedbecauseoftheirintrigu ingpropertiessuchaselectronic,optical,magnetic,mechanicalandcatalyticpropertieswhichdifferfrom thoseofbulkmaterials[1～…     

稀土正硼酸盐Ln1-xBO3:Eux(Ln=Y,Gd)的结构与发光特性

用溶胶－凝胶法和高温固相反应分别制备了纳米量级和常规尺度的稀土正硼酸盐荧光粉ＬnBO3:3n(Ln=Y,Gd),测量了它们的激发光谱并首次观察到了ＹＢＯ３：Ｅu中Ｅu^3 的^7F0→^5D0跃迁的Nephelauxetic效应。根据低温下的激发光谱,发射光谱以及变温条件对发光光谱的影响,ＹＢＯ３中Ｌn^3＋所占据的两种格位的对称性被修正为Ｃ３和Ｄ３。在不同方法制备的样品中观察到了不同的发光强度和猝灭浓度。缺陷的影响是产生这种不同的原因,退火样品的发光和拉曼散射谱的变化反映出掺杂的杂质Eu^3 的团聚化是可能的缺陷来源。     

复方布洛肾素那敏片的开发及体外溶出评估

目的：制备复方布洛肾素那敏片,优化处方组成与制备工艺,评价自制制剂和参比制剂溶出曲线的相似性。方法：将布洛芬与马来酸氯苯那敏组合进行湿法制粒,盐酸去氧肾上腺素单独进行湿法制粒,考察崩解剂交联羧甲基纤维素钠、粘合剂羟丙甲纤维素、润滑剂硬脂酸镁用量,以及布洛芬原料粒径等影响因素对溶出的影响,确定最终处方组成。结果：经过处方筛选,在片剂总重480 mg条件下,确定布洛芬原料粒径范围为170μm≤D₉₀≤190μm,崩解剂交联羧甲基纤维素钠用量为25.2 mg,粘合剂羟丙甲纤维素用量为4.2 mg,润滑剂硬脂酸镁用量为4.2 mg,自制制剂与参比制剂在4种溶出介质中溶出曲线的相似因子(f2)值高于50。结论：成功制备复方布洛肾素那敏片,制剂处方简单,工艺稳定,重现性好,溶出曲线与参比制剂相似,为后期生产布洛肾素那敏片剂提供理论依据。     

Preparation, Structural Analysis and Luminescence Properties of Nanocrystalline Phosphor Gd_2O_3∶Eu

Gd2 O3isagoodhostmaterialforluminescenceandhasbeenstudiedwelltheseyears .Gd2 O3dopedwithrareearth (RE)ionsisanidealsystemforfunda mentalresearchsuchasenergytransfer[1] .Moreover ,Gd2 O3∶REhasextensiveuse .Especially ,asahighefficientred emissionluminescentmaterial ,cubicGd2 O3∶EuhasbeenwidelyusedinX rayscintillatormaterial ,highdefinitionprojectiontelevisions ,flatpaneldisplaysandphotoelectronicapparatus[2 ,3] .Inthepastcoupleofdecades ,therehasbeenadramaticgrowthofinterestinnanocrystal…     

电子信息工程技术的应用及未来发展趋势

随着我国电子信息技术的快速发展,其广泛的应用到我国航空、生活、医学等多个领域,如物联网等科学技术有望进一步发展,并改变人们的生活.从1993年的信息高速公路计划到现在的互联网技术可以看出,电子信息工程技术对社会生活的巨大影响.本文通过介绍电子信息工程技术的应用现状,分析研究其未来发展趋势,以供参考.     

Luminescence Properties of Tb^3＋ -Doped LuAG Films Prepared by Pechini Sol-Gel Method

Lu3Al5O12（LuAG） thin films with different Tb^3＋ concentration were prepared on carefully cleaned （111 ） silicon wafer by a Peehini process and dip-coating technique. Heat treatment was performed in the temperature range from 800 to 1100 ℃. The crystal structure was analyzed by XRD. The results show that LuAG film starts to crystallize at about 900 ℃, and the particle size increases with the sintering temperature. Excitation and emission spectra of Tb^3＋ doped LuAG films were measured. The effects of heat-treatment temperature and doping concentration of Th3 ＋ on the luminescent properties were also investigated. For a comparison study, Th^3＋-doped LuAG powders were also prepared by the same sol-gel method.     

Luminescence properties of a single-host phosphor Bal.8-wSrwLi0.4SiO4： cea＋,Eu2＋,Mn2＋ for WLED

In order to obtain a single-host-white-light phosphor,a series of Ba1.8-w-x-y-zSrwLi0.4-xCexEuyMnzSiO4(BSLS:Ce3+,Eu2+,Mn2+)powder samples were synthesized via high temperature solid-state reaction.The structure and photoluminescence properties were investigated.Under ultraviolet excitation,the emission spectra contained three bands:the 370-470 nm blue band,the 470-570 nm green band and the 570-700 nm red band,which arose from the 5d→4f transitions of Ce3+ and Eu2+,and the 4T1→6A1 transition of Mn2+,respectively.The excitation spectra of the emissions of Ce3+ and Mn2+ ions showed the energy transfer from Ce3+ to Mn2+.White light emission was obtained from the tri-doped samples of appropriate doping concentration under 310-360 nm excitation.     

固相法合成掺杂型锂钛系离子筛及其吸附性能

以自制的氢氧化钛和乙酸锂为原料,掺入少量乙酸铈,用高温固相法焙烧得到掺杂型锂钛复合氧化物(LTCO),经0.1 mol?L-1盐酸浸渍酸改型制备出锂离子筛(HTCO).经X射线衍射仪(XRD)、扫描电子显微镜(SEM)及离子筛选择吸附性能测试,考察了离子筛的晶相、形貌及选择性.结果表明:在750℃下焙烧得到的离子筛为尖...     

低共熔溶剂萃取精馏分离苯/环己烯共沸物研究

以四丁基溴化铵(TBAB)、氯化胆碱(ChCl)为氢键受体,乙二醇(EG)、乙酰丙酸(LA)为氢键供体合成的TBAB:EG (1:2), TBAB:LA (1:2), ChCl:LA (1:2)三种低共熔溶剂(DES)作为萃取剂,通过萃取精馏分离苯-环己烯共沸体系。实验测量了环己烯-苯-DES三元体系气液相平衡,并对DES组成中氢键供体和氢键受体对分离性能的影响进行探讨。结果表明,DES的分离性能由高到低依次为ChCl:LA (1:2)>TBAB:LA (1:2)>TBAB:EG (1:2);采用NRTL模型关联环己烯-苯-DES三元体系的气液相平衡数据,拟合得到体系二元交互参数;在Aspen Plus V7中针对ChCl:LA (1:2)为溶剂的萃取精馏过程进行建模计算,并将其分离效果与传统溶剂N,N-二甲基乙酰胺(DMAC)进行对比,以DES为溶剂的萃取精馏过程相比于DMAC,回流比由3.8降至0.30,流程整体热负荷减少了16.57%。