权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Pillar Density Control and Properties of Sintered Body of Oxide Pillared Fluorine Micas

氧化物柱撑氟云母柱密度控制及烧结体性能

基本信息

批准号：
07651014
负责人：
KITAJIMA Kunio
金额：
$ 1.28万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

In order to clarify the influence of interlayr cation species and layr charge upon formation and properties of oxide pillared fluorine micas, synthetic expandable fluorine micas having different interlayr cations and layr charges were allowed to react with hydroxoaluminum, hydroxochromium solutions and titania sol prepared by hydrolyzing titanium tetraisopropoxide (TTIP) with hydrochloric acid, respectively. The results were summarized as follows. 1)Intercalation of highly polymelyzed hydroxoaluminum ions resulted in the highest value of Al-content as well as the highest thermal durability for alumina pillared fluorine micas. 2)Alumina pillared fluorine micas were found to be sinterable, forming sintered bodies at 700ﾟC.3)Cation exchange selectivity of polycations for intercalation depended on layr charge of host crystals, resulting in larger average hydrolysis degree of interlayr compounds for lower layr-charged micas. 4)The relation between reation conditions and average hydrolysis rates of interlayr compounds were clarified. 5)More highly polymerized hydroxochromium ions were intercalated when reacted above 80ﾟC.6)The most appropriate reaction conditions of complex formation were decided to be [TTIP/HCl] ratio of 4, concentration of HCl used being 1 mol/dm^3 with reaction time of 180 min at 50ﾟC.7)Interlayr cation species of host micas had the profound influence on complex formation, resulting on different titania contents and surface areas of pillared micas in the order of K^+<Na^+<Li^+.8)Na_<x->-system was greatly influenced by layr charge, giving a maximum of titania content at x=0.6. This can be explained in terms of the counterbalancing between expandability and cation exchange capacity. 9)Thermal durability of titania pillared fluorine micas depended on titania content. 10)Part of interlayr titania was expelled from interlayr region onto crystal surfaces of mica to precipitate as anatase at higher temperatures.

为了阐明层间阳离子种类和层电荷对氧化物柱撑氟云母的形成和性能的影响，将具有不同层间阳离子和层电荷的合成可膨胀氟云母与羟基铝、羟基铬溶液和用盐酸水解四异丙醇钛(TTIP)制备的二氧化钛溶胶反应，分别。结果总结如下。 1)高度聚合的羟基铝离子的嵌入导致氧化铝柱撑氟云母具有最高的Al含量以及最高的热耐久性。 2)氧化铝柱撑氟云母被发现是可烧结的，在700°C时形成烧结体。3)插层的聚阳离子的阳离子交换选择性取决于主体晶体的层电荷，导致层电荷较低的云母层间化合物的平均水解度较大。 4)阐明了反应条件与层间化合物平均水解率的关系。 5)在80℃以上反应时，会嵌入更多高聚合的羟铬离子。6)确定络合物形成最合适的反应条件为[TTIP/HCl]比为4，HCl浓度为1 mol/dm^3，反应时间为180 min，50℃。7)主体云母的层间阳离子种类对络合物的形成有深远的影响，导致不同的二氧化钛含量和表面积柱状云母的K^+<Na^+<Li^+.8)Na_<x->-体系受层电荷影响很大，在x=0.6时二氧化钛含量最大。这可以用膨胀性和阳离子交换能力之间的平衡来解释。 9)二氧化钛柱氟云母的热耐久性取决于二氧化钛含量。 10)在较高温度下，部分层间二氧化钛从层间区域排出到云母晶体表面，以锐钛矿形式沉淀。