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流化床中缠结多壁碳纳米管颗粒密度和固体持留量测量的成像方法

Imaging Method for Measurements of Particle Density and Solid Holdup of Entangled MWCNTs in a Fluidized Bed.

作者信息

Lee Min Ji, Kim Sung Won

机构信息

School of Chemical and Material Engineering, Korea National University of Transportation, Chungju-si, Chungbuk 27469, Korea.

出版信息

Materials (Basel). 2019 Jun 25;12(12):2035. doi: 10.3390/ma12122035.

DOI:10.3390/ma12122035
PMID:31242591
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6631823/
Abstract

A measurement method of the apparent particle density of the carbon nanotube (CNT) particles, characterized by enveloped volume formed by loosely entangled nanotubes, has been proposed for the CNT fluidized bed application. The method is characterized by obtaining the enveloped volume from the CNTs imaging under the free falling condition similar to the fluidized bed. The shape of the falling CNT particles in a column (0.1 m long × 0.012 m wide × 0.60 m high) was photographed using a high-speed camera under the sedimentation condition, and the apparent CNT particle density was calculated from the enveloped volume obtained by image-processing for the particles images. The apparent densities and solid holdups by the imaging method at various conditions were compared with those by the previous Hg-porosimetry method for the two types of CNTs (a vertically aligned CNT and two entangle CNTs) and the nonporous polycarbonate particle (a reference particle). The imaging method reflects well the packed bed and fluidized bed phenomena observed in the experiments with reasonable solid holdups, compared with the Hg-porosimetry method showing high densities and low holdups. The sizes of CNT particles predicted with the density by the imaging method were in good agreement with the measured mean particle sizes when calculated based on the Richardson-Zaki equation, indicating the imaging method represented well the enveloped volume and shape formed by entangled nanotubes on the CNTs.

摘要

针对碳纳米管（CNT）流化床应用，提出了一种测量碳纳米管颗粒表观颗粒密度的方法，该方法以松散缠结的纳米管形成的包封体积为特征。该方法的特点是在类似于流化床的自由落体条件下，从碳纳米管成像中获取包封体积。在沉降条件下，使用高速摄像机拍摄碳纳米管颗粒在柱体（长0.1 m×宽0.012 m×高0.60 m）中下落的形状，并通过对颗粒图像进行图像处理得到的包封体积来计算碳纳米管颗粒的表观密度。将两种碳纳米管（垂直排列的碳纳米管和两种缠结的碳纳米管）以及无孔聚碳酸酯颗粒（参考颗粒）在各种条件下通过成像方法得到的表观密度和固体持液率与之前压汞法得到的结果进行了比较。与显示高密度和低持液率的压汞法相比，成像方法能很好地反映实验中观察到的填充床和流化床现象，且固体持液率合理。通过成像方法根据密度预测的碳纳米管颗粒尺寸与基于理查森-扎基方程计算时测量的平均颗粒尺寸高度吻合，这表明成像方法能很好地表示碳纳米管上由缠结纳米管形成的包封体积和形状。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/7c33aa71a599/materials-12-02035-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/ed0c3547ea7f/materials-12-02035-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/6267cccfed2a/materials-12-02035-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/c8d81cd337f8/materials-12-02035-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/7e4c7121cd3e/materials-12-02035-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/e7bd00d05c64/materials-12-02035-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/3e62e8b7c06e/materials-12-02035-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/5b59884b6760/materials-12-02035-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/7c33aa71a599/materials-12-02035-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/2890931548d7/materials-12-02035-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/3a5ade921c6c/materials-12-02035-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/b9e2428043de/materials-12-02035-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/ea3e326b914d/materials-12-02035-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/ed0c3547ea7f/materials-12-02035-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/6267cccfed2a/materials-12-02035-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/c8d81cd337f8/materials-12-02035-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/7e4c7121cd3e/materials-12-02035-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/e7bd00d05c64/materials-12-02035-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/3e62e8b7c06e/materials-12-02035-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/5b59884b6760/materials-12-02035-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f81f/6631823/7c33aa71a599/materials-12-02035-g012.jpg

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引用本文的文献

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Preparation of MWCNT Microbeads for the Application of Bed Materials in a Fluidized Bed Heat Exchanger.用于流化床热交换器床层材料的多壁碳纳米管微珠的制备
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本文引用的文献

1
Carbon nanotube mass production: principles and processes.碳纳米管大规模生产：原理与工艺。
ChemSusChem. 2011 Jul 18;4(7):864-89. doi: 10.1002/cssc.201100177. Epub 2011 Jul 5.
2
Van der Waals interaction between two crossed carbon nanotubes.两个交叉碳纳米管之间的范德华相互作用。
ACS Nano. 2010 Oct 26;4(10):5937-45. doi: 10.1021/nn100731u.
3
The role of surfactants in dispersion of carbon nanotubes.表面活性剂在碳纳米管分散中的作用。
Adv Colloid Interface Sci. 2006 Dec 21;128-130:37-46. doi: 10.1016/j.cis.2006.11.007. Epub 2007 Jan 10.