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Molecular alignment of nano-thin film using Raman spectroscopy

Zhang Hong-Yu Zhang Shao-Hua Liang He Liu Yu-Hong Luo Jian-Bin

Molecular alignment of nano-thin film using Raman spectroscopy

Zhang Hong-Yu, Zhang Shao-Hua, Liang He, Liu Yu-Hong, Luo Jian-Bin
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  • Molecular alignment of nano-thin liquid crystal 5CB film confined between highly polished steel ball and quartz disk under shear is studied using Raman spectroscopy. The results show that an acceptable signal-to-noise ratio as high as 20:1 can be obtained under certain experimental conditions. In addition, the intensity of the Raman spectrum reaches its peak (minimum) value when polarization of the laser is parallel (perpendicular) to the direction of shear motion. This indicates that the molecules of liquid crystal 5CB film are oriented along the direction of shear motion. Furthermore, the influence of shear speed on the intensity of Raman spectroscopy of nano-thin liquid crystal 5CB film was investigated, and its film thickness was analyzed based on a relative optical interference intensity technique.
    • Funds:
    [1]

    Luo J B, Wen S Z, Huang P 1996 Wear 194 107

    [2]

    Luo J B, Wen S Z 1996 Science in China (A) 39 1312

    [3]

    Zhang C H, Luo J B, Lei H 2005 China Mechanical Engineering Science 16 1282 (in Chinese) [张朝辉、 雒建斌、 雷 红 2005 中国机械工程 16 1282]

    [4]

    Shen M W, Luo J B, Wen S Z, Yao J B 2002 Lubr. Eng. 58 18

    [5]

    Luo J B, Shen M W, Wen S Z 2004 Journal of Applied Physics 96 6733

    [6]

    Luo J B, He Y, Wen S Z, Zhong J 2005 Tribology 25 283 (in Chinese) [雒建斌、 何 雨、 温诗铸、 钟 掘 2005 摩擦学学报 25 283]

    [7]

    Granick S 1991 Science 253 1374

    [8]

    Akbulut M, Chen N, Maeda N, Israelachvili J, Grunewald T, Helm CA 2005 J. Phys. Chem. 109 12509

    [9]

    Xiong Y, Zhang X J, Zhang X H, Wen S Z 2009 Acta Phys. Sin. 58 1826 (in Chinese) [熊 毅、 张向军、 张晓昊、 温诗铸 2009物理学报 58 1826]

    [10]

    Huang Q, Wang J, Cao L R, Sun J, Zhang X D, Geng W D, Xiong S Z, Zhao Y 2009 Acta Phys. Sin. 58 1980 (in Chinese) [黄 茜、 王 京、 曹丽冉、 孙 建、 张晓丹、 耿卫东、 熊绍 珍、 赵 颖 2009 物理学报 58 1980]

    [11]

    Zang H, Wang Z G, Pang L F, Wei K F, Yao C F, Shen J L 2010 Acta Phys. Sin. 59 4831 (in Chinese) [臧 航、 王志光、 庞立龙、 魏孔芳、 姚存峰、 申铁龙 2010 物理学报 59 4831]

    [12]

    Li J F, Huang Y F, Ding Y, Yang Z L, Li S B, Zhou X S, Fan F R, Zhang W, Zhou Z Y, Wu D Y, Ren B, Wang Z L, Tian Z Q 2010 Nature 464 392

    [13]

    Bongaerts J H H, Day J P R, Marriott C, Pudney P D A, Williamson A M 2008 J. Appl. Phys. 104 014913

    [14]

    Jiang S, Bae S C, Granick S 2008 Langmuir 24 1489

    [15]

    Bae S C, Wong J S, Kim M, Jiang S, Hong L, Granick S 2008 Philos. Trans. R. Soc. London, Ser. A 366 1443

    [16]

    Jones W J, Thomas D K, Thomas D W, Williams G 2004 J. Mol. Struct. 708 145

    [17]

    Luo J B 1994 Ph. D. Dissertation (Beijing: Tsinghua University) (in Chinese) [雒建斌 1994 博士学位论文 (北京:清华大学)]

  • [1]

    Luo J B, Wen S Z, Huang P 1996 Wear 194 107

    [2]

    Luo J B, Wen S Z 1996 Science in China (A) 39 1312

    [3]

    Zhang C H, Luo J B, Lei H 2005 China Mechanical Engineering Science 16 1282 (in Chinese) [张朝辉、 雒建斌、 雷 红 2005 中国机械工程 16 1282]

    [4]

    Shen M W, Luo J B, Wen S Z, Yao J B 2002 Lubr. Eng. 58 18

    [5]

    Luo J B, Shen M W, Wen S Z 2004 Journal of Applied Physics 96 6733

    [6]

    Luo J B, He Y, Wen S Z, Zhong J 2005 Tribology 25 283 (in Chinese) [雒建斌、 何 雨、 温诗铸、 钟 掘 2005 摩擦学学报 25 283]

    [7]

    Granick S 1991 Science 253 1374

    [8]

    Akbulut M, Chen N, Maeda N, Israelachvili J, Grunewald T, Helm CA 2005 J. Phys. Chem. 109 12509

    [9]

    Xiong Y, Zhang X J, Zhang X H, Wen S Z 2009 Acta Phys. Sin. 58 1826 (in Chinese) [熊 毅、 张向军、 张晓昊、 温诗铸 2009物理学报 58 1826]

    [10]

    Huang Q, Wang J, Cao L R, Sun J, Zhang X D, Geng W D, Xiong S Z, Zhao Y 2009 Acta Phys. Sin. 58 1980 (in Chinese) [黄 茜、 王 京、 曹丽冉、 孙 建、 张晓丹、 耿卫东、 熊绍 珍、 赵 颖 2009 物理学报 58 1980]

    [11]

    Zang H, Wang Z G, Pang L F, Wei K F, Yao C F, Shen J L 2010 Acta Phys. Sin. 59 4831 (in Chinese) [臧 航、 王志光、 庞立龙、 魏孔芳、 姚存峰、 申铁龙 2010 物理学报 59 4831]

    [12]

    Li J F, Huang Y F, Ding Y, Yang Z L, Li S B, Zhou X S, Fan F R, Zhang W, Zhou Z Y, Wu D Y, Ren B, Wang Z L, Tian Z Q 2010 Nature 464 392

    [13]

    Bongaerts J H H, Day J P R, Marriott C, Pudney P D A, Williamson A M 2008 J. Appl. Phys. 104 014913

    [14]

    Jiang S, Bae S C, Granick S 2008 Langmuir 24 1489

    [15]

    Bae S C, Wong J S, Kim M, Jiang S, Hong L, Granick S 2008 Philos. Trans. R. Soc. London, Ser. A 366 1443

    [16]

    Jones W J, Thomas D K, Thomas D W, Williams G 2004 J. Mol. Struct. 708 145

    [17]

    Luo J B 1994 Ph. D. Dissertation (Beijing: Tsinghua University) (in Chinese) [雒建斌 1994 博士学位论文 (北京:清华大学)]

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  • Received Date:  10 October 2010
  • Accepted Date:  07 January 2011
  • Published Online:  15 September 2011

Molecular alignment of nano-thin film using Raman spectroscopy

  • 1. State Key Laboratory of Tribology,Department of Precision Instruments and Mechanology, Tsinghua University,Beijing 100084,China

Abstract: Molecular alignment of nano-thin liquid crystal 5CB film confined between highly polished steel ball and quartz disk under shear is studied using Raman spectroscopy. The results show that an acceptable signal-to-noise ratio as high as 20:1 can be obtained under certain experimental conditions. In addition, the intensity of the Raman spectrum reaches its peak (minimum) value when polarization of the laser is parallel (perpendicular) to the direction of shear motion. This indicates that the molecules of liquid crystal 5CB film are oriented along the direction of shear motion. Furthermore, the influence of shear speed on the intensity of Raman spectroscopy of nano-thin liquid crystal 5CB film was investigated, and its film thickness was analyzed based on a relative optical interference intensity technique.

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