In situ observations of clay mineral dissolution by AFM : investigation of the dissolution rate and mechanism
AFM 现场观察粘土矿物溶解:溶解速率和机理研究
基本信息
- 批准号:17540457
- 负责人:
- 金额:$ 2.42万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2005
- 资助国家:日本
- 起止时间:2005 至 2007
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In this study, we examined the dissolution behavior of clay minerals (especially, dioctahedral phyllosilicate minerals) under alkaline conditions at 25-50℃, using AFM with an air/fluid heater system. The main goals of this study were to comprehend the dissolution behavior of clay minerals under alkaline conditions, to determine the reliable dissolution rate, and to reveal the effect of temperature on the dissolution rate.The 2: 1 phyllosilicates, such as smectite and muscovite, dissolution took place only at the edge surfaces that are lesser than a few percent of the total surface area (TSA), while the basal surfaces were completely unreactive. The edge surface area (ESA)-normalized dissolution rate at a certain pH and temperature condition, therefore, has a constant value independent of the size of etch pit or island (particle). In contrast, the TSA-normalized dissolution rates varied with the size of etch pit or island.The activation energy for muscovite dissolution under alkaline conditions was very close to that for montmorillonite and illite dissolution. A model dissolution rate equation, which simultaneously includes the effect of pH and temperature, was deduced from the effect of pH on the activation energy, the rate equation of muscovite dissolution at 25℃, and the Arrhenius equation. The dissolution rates estimated from the model were in good agreement with the experimental rates from 25 to 70℃. The dissolution reaction order with respect to hydroxyl activity (or pH)increases with temperature.
在这项研究中,我们研究了粘土矿物(特别是二八面体层状硅酸盐矿物)在25-50℃碱性条件下的溶解行为,使用AFM与空气/流体加热系统。本研究的主要目的是了解粘土矿物在碱性条件下的溶解行为,确定可靠的溶解速率,揭示温度对溶解速率的影响。2: 1层状硅酸盐,如蒙脱石和白云母,只在小于总表面积(TSA)百分之几的边缘表面发生溶解,而基面完全不发生反应。因此,在一定pH和温度条件下,边缘表面积(ESA)归一化溶解速率具有恒定值,与蚀刻坑或岛(颗粒)的大小无关。相比之下,tsa标准化溶解速率随蚀刻坑或岛的大小而变化。白云母在碱性条件下的溶解活化能与蒙脱土和伊利石的溶解活化能非常接近。从pH对活化能的影响、25℃下白云母溶解速率方程和Arrhenius方程出发,推导出了同时考虑pH和温度影响的模型溶解速率方程。模型计算的溶解速率与25 ~ 70℃范围内的实验速率吻合较好。溶解反应顺序与羟基活性(或pH值)有关,随温度升高而增加。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Assignment of infrared OH-stretching bands in calcic amphiboles through deuteration and heat treatment
通过氘化和热处理对钙角闪石中的红外 OH 伸缩带进行分配
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:S.Miyamoto;et. al.;K.Ishida and F.C.Hawthone
- 通讯作者:K.Ishida and F.C.Hawthone
In-situ, real time AFM study of smectite dissolution under high pH conditions at 25°-50℃
25°-50℃高pH条件下蒙皂石溶解的原位实时AFM研究
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:Y.;Kuwahara
- 通讯作者:Kuwahara
In situ observations of the dissolution of smectite and muscovite under alkaline conditions by hot-stage AFM
高温AFM原位观察碱性条件下蒙皂石和白云母的溶解
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:Y.;Kuwahara
- 通讯作者:Kuwahara
Recent trends of mineralogical investigation of serpentine
蛇纹石矿物学研究的最新动态
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:S.;Uehara
- 通讯作者:Uehara
Detailed Structure and Microchemistry of 15-sectored Polygonal Serpentine
15 扇形多边形蛇纹石的详细结构和微观化学
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:林信太郎;伊藤英之;伴雅雄;毛利春治;Y.Kuwahara;伴 雅雄;伴 雅雄;S.Uehara and F.J.Wicks
- 通讯作者:S.Uehara and F.J.Wicks
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KUWAHARA Yoshihiro其他文献
KUWAHARA Yoshihiro的其他文献
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{{ truncateString('KUWAHARA Yoshihiro', 18)}}的其他基金
Crystal growth of minerals as an indicator of climatic and environmental changes at lower and higher temperatures: In situ hot/cool stage AFM study at a nano level
矿物晶体生长作为较低和较高温度下气候和环境变化的指标:纳米级原位热/冷阶段 AFM 研究
- 批准号:
26400518 - 财政年份:2014
- 资助金额:
$ 2.42万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Dissolution and growth mechanisms of minerals as an indicator of climatic and environmental changes: In situ hot/cool stage AFM study at a nano level
作为气候和环境变化指标的矿物溶解和生长机制:纳米级原位热/冷阶段 AFM 研究
- 批准号:
23340163 - 财政年份:2011
- 资助金额:
$ 2.42万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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