Understanding of crystal growth and reaction mechanism in hydrothermal synthesis at supercritical conditions

了解超临界条件水热合成中的晶体生长和反应机理

基本信息

  • 批准号:
    11450287
  • 负责人:
  • 金额:
    $ 8.26万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1999
  • 资助国家:
    日本
  • 起止时间:
    1999 至 2001
  • 项目状态:
    已结题

项目摘要

We have conducted hydrothermal synthesis of metal oxide fine particles in supercritical water. To establish these new technologies, it is necessary to clarify characteristic and function of supercritical water as the reaction solvent. In this study, firstly, we developed the simple estimation model of equilibrium constant (dissolution and dissociation reaction) and the flow-through apparatus for measuring pH and metal oxide solubility at supercritical conditions. Secondary, we conducted the experiment of hydrothermal synthesis of several metal oxides with flow-through experimental apparatus and considered the relationship between experimental condition and generation region of nano size fine particle.The hydrothermal reaction rate in supercritical water is higher, and the solubility of metal oxides is much lower than that in subcritical water. Both facts lead to the generation of higher super-saturation degree. The nucleation rate is expressed by the function of super-saturation degree and the surface energy according to the nucleation theory. Thus, extremely high nucleation rate can be expected at supercritical conditions. Simulation of reaction kinetics, nucleation, and crystal growth would provide quantitative explanation for the temperature dependence of the particle size. In spite of the lack of such quantitative information, the results shown in this study suggests the specific features of supercritical water hydrothermal synthesis method for the production of nanocrystals.
我们在超临界水中进行了金属氧化物微粒的水热合成。为了建立这些新技术,有必要阐明超临界水作为反应溶剂的特点和作用。在这项研究中,我们首先建立了简单的平衡常数(溶解和解离反应)估算模型和超临界条件下测定pH值和金属氧化物溶解度的流动装置。其次,利用流通式实验装置进行了几种金属氧化物的水热合成实验,考虑了实验条件与纳米微粒生成区域的关系,发现超临界水中的水热反应速率较高,金属氧化物的溶解度远低于亚临界水中。这两个因素都导致了较高的过饱和度的产生。根据成核理论,用过饱和度和表面能的函数来表示成核速率。因此,在超临界条件下,可以预期极高的成核率。对反应动力学、成核和晶体生长的模拟将为颗粒尺寸的温度依赖性提供定量的解释。尽管缺乏这样的定量信息,但本研究的结果表明了超临界水热合成法制备纳米晶体的特殊性。

项目成果

期刊论文数量(26)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
T. Adschiri, Y. Hakuta, K. Sue and K. Arai: "Hydrothermal Synthesis of Metal Oxide Nano Particles at Supercritical Conditions"Journal of Nanoparticle Research. Vol. 3, Issue 2/3. 227-235 (2001)
T. Adschiri、Y. Hakuta、K. Sue 和 K. Arai:“超临界条件下金属氧化物纳米颗粒的水热合成”纳米颗粒研究杂志。
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    0
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K. Sue, K. Murata, K. Matsuura, M. Tsukagoshi, T. Adschiri and K. Arai: "Potentiometric cell for measuring pH of supercritical aqueous solutions"Review of Scientific Instruments. Vol. 72, No. 12. 4442-4448 (2001)
K. Sue、K. Murata、K. Matsuura、M. Tsukagoshi、T. Adschiri 和 K. Arai:“用于测量超临界水溶液 pH 值的电位池”科学仪器评论。
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    0
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T.Adschiri, Y.Hakuta, K.Sue, K.Arai: "Hydrothermal Synthesis of Metal Oxide Nano Particles at Supercritical Conditions"Journal of Nanoparticle Research. Vol.3,Issue2/3. 227-235 (2001)
T.Adschiri、Y.Hakuta、K.Sue、K.Arai:“超临界条件下金属氧化物纳米粒子的水热合成”纳米粒子研究杂志。
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    0
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K.Sue, Y.Hakuta, R.L.Smith, Jr., T.Adschiri, K.Arai: "Solubility of Lead(II) Oxide and Copper(II) Oxide in Subcritical and Supercritical Water"Journal of Chemical & Engineering Data. Vol.44,No.6. 1422-1426 (1999)
K.Sue、Y.Hakuta、R.L.Smith, Jr.、T.Adschiri、K.Arai:“氧化铅 (II) 和氧化铜 (II) 在亚临界和超临界水中的溶解度”化学杂志
  • DOI:
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    0
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  • 通讯作者:
K.Sue, K.Murata, K.Matsuura, M.Tsukagoshi, T.Adschiri, K.Arai: "Potentiometric cell for measuring pH of supercritical aqueous solutions"Review of Scientific Instruments. 72・12. 4442-4448 (2001)
K.Sue、K.Murata、K.Matsuura、M.Tsukagoshi、T.Adschiri、K.Arai:“用于测量超临界水溶液 pH 值的电位池”科学仪器评论 72・12 (2001)。
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ARAI Kunio其他文献

ARAI Kunio的其他文献

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{{ truncateString('ARAI Kunio', 18)}}的其他基金

Rapid and high selective suger conversion to chemicals in ultra high pressure reaction
在超高压反应中快速、高选择性地将糖转化为化学品
  • 批准号:
    18360379
  • 财政年份:
    2006
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Development of Continuous Apparatus using Microreactor for Production of Nanoparticles in Supercritical Water
超临界水中微反应器连续生产纳米颗粒装置的开发
  • 批准号:
    15360416
  • 财政年份:
    2003
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Development of the upgrading process of heavy oil in supercritical water
超临界水重油改质工艺开发
  • 批准号:
    11694121
  • 财政年份:
    1999
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Development of Continuous Synthesis Method of Lithium Transition Metal Oxide Fine Particles via Reactive Crystallization in Supercritical Water
超临界水中反应结晶连续合成锂过渡金属氧化物细粒方法的进展
  • 批准号:
    10555261
  • 财政年份:
    1998
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Hydrogenation of Heavy Oil through Partial Oxidation in Supercritical Water
超临界水部分氧化重油加氢
  • 批准号:
    09450281
  • 财政年份:
    1997
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Production of Phosphor (YAG : Tb) particles by Supercritical Water Crystallization Method
超临界水结晶法生产荧光粉(YAG:Tb)颗粒
  • 批准号:
    08555184
  • 财政年份:
    1996
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Reactive crystallization in supercritical water.
超临界水中的反应结晶。
  • 批准号:
    07405036
  • 财政年份:
    1995
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Continuous production of hybrid metal oxide fine particles
复合金属氧化物细颗粒的连续生产
  • 批准号:
    06555230
  • 财政年份:
    1994
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Snpecriecd fluid as a reaction media for solid catalyzed reaction
特定流体作为固体催化反应的反应介质
  • 批准号:
    05453105
  • 财政年份:
    1993
  • 资助金额:
    $ 8.26万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)

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利用水热合成技术和二维材料设计沸石的结构和催化性能
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