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平板电极间胶体晶体在电场作用下的各向同性压缩

李小龙 陆颖 翟永亮 吴兰生 孙威 胡书新

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平板电极间胶体晶体在电场作用下的各向同性压缩

李小龙, 陆颖, 翟永亮, 吴兰生, 孙威, 胡书新

Isotropic compression of colloidal crystal in electric field between plate electrode

Li Xiao-Long, Lu Ying, Zhai Yong-Liang, Wu Lan-Sheng, Sun Wei, Hu Shu-Xin
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  • 用直径 300 nm的聚苯乙烯微球配制不同浓度的胶体晶体溶液, 将其快速注入内表面镀有导电薄膜的玻璃样品池中, 形成 (111) 晶面平行于玻璃表面的面心立方单晶结构. 通过激光衍射Kossel线方法, 研究了不同体积分数的胶体晶体样品 及它们在均匀电场作用下晶体结构的变化. 实验发现, 随着电场强度的增加, 胶体晶体表现为各向同性的压缩. 胶体晶体在恒定电场下始终保持面心立方结构, 晶格常数随着电场强度的增加逐渐减小. 实验结果可用电场力、电流体力学作用力及颗粒间静电斥力共同解释: 电场力使带电微球克服静电斥力并沿电场反方向运动导致晶体压缩, 而由电场力作用引起的电流体力学液流产生的持续推力使垂直于电场平面上的胶体微球相互靠近. 本实验为天宫一号搭载科学实验的地基实验.
    Colloidal crystals composed of polystyrene micro-spheres (negatively charged, with a diameter of 300 nm) are fabricated by injecting aqueous suspensions of the micro-spheres with different volume fractions into sample cells which are made by gluing together two glass plates. Whose surfaces are coated with conductive films. The colloidal crystals have a face-centered-cubic structure with their (111) planes parallel to the surface of the sample cells. Laser diffraction is used to measure the structural changes of the colloidal crystals in an electric field. Structures of the colloidal crystals are characterized by using the Kossel-line method. It is found that the colloidal crystals are compressed isotropically in the electrical field. The lattice constants of the colloidal crystals decrease with the increase of the electric field, maintaining their face-centered-cubic structure. Results can be explained by the combined action of the electric field force, electrostatic repulsion and electrohydrodynamic force. The electric field makes all of the micro-spheres migrate to the positive plate of the sample cell and leads to a compression in the direction along the electric field. Then the electrohydrodynamic force produces an attractive interaction between the micro-spheres in the direction perpendicular to the electric field.
    • 基金项目: 中国载人航天工程和国家自然科学基金(批准号: 10904164, 11104328)资助的课题.
    • Funds: Project supported by the China Manned Space Engineering, and the National Natural Science Foundation of China (Grant Nos. 10904164, 11104328).
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    Li F J, Hong X G, Dong B Z 2003 Chin. Phys. 12 771

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    Pushkar P L, Manish Mittal, Furst E M 2008 Langmuir. 24 12842

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    Tae Soup Shim, Shin-Hyun Kim 2010 Adv. Mater. 22 4494

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    Richetti P, Barois P J 1984 Phys. Lett. 45 1137

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    Trau M, Saville D A, Aksay I A 1997 Langmuir. 13 6375

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    Han Y L, Grier D G 2005 J. Chem. Phys. 122 164701

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    Li C R, Li S W 2011 Chin. Phys. B 20 078102

    [9]

    Kossel W, Voges H 1935 Ann. Phys. (Leipzig) 23 677

    [10]

    Clark N A, Hurd A J, Ackerson B J 1979 Nature 281 57

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    Arora A K, Tata B V R 2003 Ordering and Phase Transitions in Charged Colloids (New York: VCH Publishers, Inc) p51

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    Tadatomi Shinohara, Hisashi Yamada 2004 Langmuir 20 5141

    [13]

    Tadatomi Shinohara, Tsuyoshi Yoshiyama 2001 Langmuir 17 8010

  • [1]

    Chen Y 2003 Chin. Phys. Lett. 20 1626

    [2]

    Li F J, Hong X G, Dong B Z 2003 Chin. Phys. 12 771

    [3]

    Pushkar P L, Manish Mittal, Furst E M 2008 Langmuir. 24 12842

    [4]

    Tae Soup Shim, Shin-Hyun Kim 2010 Adv. Mater. 22 4494

    [5]

    Richetti P, Barois P J 1984 Phys. Lett. 45 1137

    [6]

    Trau M, Saville D A, Aksay I A 1997 Langmuir. 13 6375

    [7]

    Han Y L, Grier D G 2005 J. Chem. Phys. 122 164701

    [8]

    Li C R, Li S W 2011 Chin. Phys. B 20 078102

    [9]

    Kossel W, Voges H 1935 Ann. Phys. (Leipzig) 23 677

    [10]

    Clark N A, Hurd A J, Ackerson B J 1979 Nature 281 57

    [11]

    Arora A K, Tata B V R 2003 Ordering and Phase Transitions in Charged Colloids (New York: VCH Publishers, Inc) p51

    [12]

    Tadatomi Shinohara, Hisashi Yamada 2004 Langmuir 20 5141

    [13]

    Tadatomi Shinohara, Tsuyoshi Yoshiyama 2001 Langmuir 17 8010

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  • 文章访问数:  4787
  • PDF下载量:  179
  • 被引次数: 0
出版历程
  • 收稿日期:  2013-04-23
  • 修回日期:  2013-05-31
  • 刊出日期:  2013-09-05

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