Preparation and Nanostructure-Control Technologies for Fine Particulate Advanced Materials Using Organized Interfacial Reaction Field

利用有序界面反应场制备细颗粒先进材料及纳米结构控制技术

基本信息

批准号：
13650813
负责人：
HIRAI Takayuki
金额：
$ 2.5万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Emulsion liquid membrane (ELM, w/O/w emulsion) system has been used for separation and concentration of metal ions. In this study, the ELM system was utilized for preparation of fine particulate materials, aiming to control their size,and morphology, by using the micrometer-sized internal water droplets as size-restricted reaction field. The interface between the organic membrane phase and the internal water phase gives hydrophobic,reaction sites for the particles formation, and template effect for particle growth may be expectedPhosphate particles of the selected rare earth metals have been prepared using ELM system. Submicrometer-sized spherical phosphate particles are obtained. Composite LaPO_4 : Ce^<3+>,Tb^<3+> phosphor particles were then prepared, with the resulting particles showing red photoluminescence at 545 nm. Size and morphology-controlled composite Gd-Eu oxalate particles were prepared in ELM system, The oxalate particles thus prepared were calcined in air to obtain Gd_2O … More _3 : Eu^<3+> phosphor particles and in sulfur atmosphere to obtain Gd_2O_2S : Eu^<3+> phosphor particles. These submicrometer-sized spherical phosphor particles showed photoluminescence properties with emission peak at 614 nm for Gd_2O_3 : Eu^<3+> and 628 nm for Gd_2O_2S : Eu^<3+>Upconverting phosphor fine particles (Y_2O_3 : Yb,Er) have been prepared using ELM system. The precursor particles obtained in the VA-10 ELM system were mainly 20-60 nm in size. The Y_2O_3 : Yb,Er particles demonstrated an upconversion emission at 662 nm, by infrared excitation (λ_<ex> = 980 nm) via a two-photon process. Yttrium oxysulfide upconverting phosphor nanoparticles, doped with Yb as a sensitizes and Er (or Ho, Tm) as an activator, have also been prepared, via a solid-gas reaction using precursor oxalate,particles obtained in ELM system. The resulting Y_2O_2S : Yb,Er particles, mainly smaller than 50 nm in diameter, demonstrated green upconversion emission under infrared excitation. Distinct green and blue upconversion emission were also demonstrated by Y_2O_2S : Yb,Ho and Y_2O_2S : Yb,Tm nanoparticles, respectively, under the same, infrared excitation. These upconverting phosphor nanoparticles with different emission under same infrared excitation may be applied to the luminescent reporter materials for the detection of the targeted analyte in multiplexed assays Less

乳液液膜（ELM，w/O/w 乳液）系统已用于金属离子的分离和浓缩。在本研究中，ELM 系统用于制备细颗粒材料，旨在控制其尺寸和形态。通过使用微米尺寸的内部水滴作为尺寸限制场，有机膜相和内部水反应相之间的界面为颗粒形成提供疏水性反应位点，并且可以预期颗粒生长的模板效应。使用ELM系统制备了亚微米尺寸的球形磷酸盐颗粒，然后制备了复合LaPO_4：Ce^3+、Tb^3+荧光粉颗粒，所得颗粒呈红色。在ELM系统中制备尺寸和形貌可控的复合Gd-Eu草酸盐颗粒，将由此制备的草酸盐颗粒在空气中煅烧以获得545 nm的光致发光。 Gd_2O … More _3 : Eu^<3+> 荧光粉颗粒在硫气氛中得到 Gd_2O_2S : Eu^<3+> 荧光粉颗粒这些亚微米尺寸的球形荧光粉颗粒表现出光致发光特性，Gd_2O_3 : Eu 的发射峰在 614 nm 处。 ^<3+> 和 628 nm（Gd_2O_2S）：采用ELM系统制备了Eu^ 3+ 上转换荧光粉细颗粒(Y_2O_3:Yb,Er)。在VA-10ELM系统中获得的前驱体颗粒的尺寸主要为20-60nm。通过双光子过程的红外激发（λ_<ex> = 980 nm），粒子表现出 662 nm 的上转换发射。还通过使用前体草酸盐的固-气反应制备了硫氧化钇上转换荧光粉纳米颗粒，掺杂 Yb 作为敏化剂和 Er（或 Ho、Tm）作为活化剂，在 ELM 系统中获得颗粒，得到 Y_2O_2S : Yb。 ,Er 颗粒（主要直径小于 50 nm）在红外激发下表现出绿色上转换发射。在相同的红外激发下，Y_2O_2S : Yb,Ho 和 Y_2O_2S : Yb,Tm 纳米颗粒也分别表现出明显的绿色和蓝色上转换发射，这些在相同红外激发下具有不同发射的上转换荧光粉纳米颗粒可应用于发光报道分子。用于在多重检测中检测目标分析物的材料 Less