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首页> 外文期刊>RSC Advances >Aggregation and stabilization of multiwalled carbon nanotubes in aqueous suspensions: influences of carboxymethyl cellulose, starch and humic acid
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Aggregation and stabilization of multiwalled carbon nanotubes in aqueous suspensions: influences of carboxymethyl cellulose, starch and humic acid

机译：含水悬浮液中多壁碳纳米管的聚集和稳定性：羧甲基纤维素，淀粉和腐殖酸的影响

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摘要

Aggregation and stability of multiwalled carbon nanotubes (MWNTs) in aqueous solutions were investigated in the presence of two polysaccharide stabilizers (carboxymethyl cellulose (CMC) and a water soluble starch) and a natural organic matter (leonardite humic acid (LHA)). While all stabilizers inhibited aggregation of MWNTs, the stabilization effectiveness ranked as CMC > starch > LHA. In the presence of 0.06 wt% of CMC or 0.08 wt% of starch, 10 mg L-1 of MWNTs were fully stabilized (no gravity settling). At 10 mg L-1 of MWNTs, the addition of 5 mg L-1 as total organic carbon of CMC increased the critical coagulation concentration (CCC) of MWNTs from similar to 25 to similar to 210 mM in NaCl solution and from similar to 0.9 to similar to 2.6 mM in CaCl2 solution. The three stabilizers showed very different effects on the electrophoretic mobility (EPM) of MWNTs: the coating of negatively charged CMC enhanced EPM from -3.24 x 10(-8) m(2) V-1 s(-1) for bare MWNTs to -5.22 x 10(-8) m(2) V-1 s(-1), while the coating of neutral starch slightly curbed EPM to -2.24 x 10(-8) m(2) V-1 s(-1), and LHA hardly affected EPM. Derjaguin-Landau-Verwey-Overbeek (DLVO) theory can interpret the stabilization mechanisms, which reveals that CMC stabilizes MWNTs through enhanced electrostatic repulsion, primary energy barrier and steric hindrance, whereas starch and LHA work primarily through steric hindrance. CMC and starch exert greater steric hindrance than LHA, partially due to the long chains of the polysaccharides and the associated steric hindrance. The information can facilitate environmental applications of carbon nanotubes and improve our understanding of the environmental fate and transport of engineered stabilized nanomaterials.
机译：在两种多糖稳定剂（羧甲基纤维素（CMC）和水溶性淀粉）和天然有机物（Leonardite腐殖酸（LHA））存在下研究了水溶液中多壁碳纳米管（MWNT）的聚集和稳定性。虽然所有稳定剂抑制MWNT的聚集，但稳定效果被排名为CMC>淀粉> LHA。在0.06wt％的CMC或0.08wt％的淀粉的存在下，10mg L-1的MWNT完全稳定（无重力沉降）。在MWNT的10mg L-1，加入5mg L-1作为CMC的总有机碳增加了MWNT的临界凝血浓度（CCC）与210mM在NaCl溶液中的210mm类似，并且类似于0.9在CaCl2溶液中类似于2.6毫米。三个稳定剂对MWNT的电泳迁移率（EPM）显示出非常不同的影响：带负电荷的CMC的涂覆来自-3.24×10（-8）V-1s（-1）的带负电性CMC增强的EPM，用于裸MWNT -5.22 x 10（-8）m（2）V-1 s（-1），而中性淀粉涂层略微抑制EPM至-2.24×10（-8）m（2）V-1 s（-1 ），LHA几乎没有影响EPM。 Derjaguin-Landau-Verwey-verwey-verwey-verwey-verwey（Dlvo）理论可以解释稳定机制，揭示CMC通过增强的静电排斥，一次能量屏障和空间障碍稳定MWNT，而淀粉和LHA主要通过空间障碍工作。 CMC和淀粉施加比LHA更大的空间障碍，部分是由于多糖的长链和相关的空间障碍。这些信息可以促进碳纳米管的环境应用，并改善我们对环境命运和工程稳定纳米材料的运输的理解。

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  • 来源
    《RSC Advances》 |2016年第71期|共11页
  • 作者

    Liu Wen; Zhao Xiao; Cai Zhengqing; Han Bing; Zhao Dongye;

  • 作者单位

    Auburn Univ Dept Civil Engn Environm Engn Program Auburn AL 36849 USA;

    Auburn Univ Dept Civil Engn Environm Engn Program Auburn AL 36849 USA;

    Auburn Univ Dept Civil Engn Environm Engn Program Auburn AL 36849 USA;

    Auburn Univ Dept Civil Engn Environm Engn Program Auburn AL 36849 USA;

    Auburn Univ Dept Civil Engn Environm Engn Program Auburn AL 36849 USA;

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