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首页> 外文期刊>Environmental Science & Technology >Influence of Biomacromolecules and Humic Acid on the Aggregation Kinetics of Single-Walled Carbon Nanotubes
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Influence of Biomacromolecules and Humic Acid on the Aggregation Kinetics of Single-Walled Carbon Nanotubes

机译：生物大分子和腐殖酸对单壁碳纳米管聚集动力学的影响

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摘要

The initial aggregation kinetics of single-walled carbon nanotubes (SWNTs) were studied using time-resolved dynamic light scattering. Aggregation of SWNTs was evaluated in the presence of natural organic matter [Suwannee River humic acid (SRHA)], polysaccharide (alginate), protein [bovine serum albumin (BSA)], and cell culture medium [Luria-Bertani (LB) broth] with varying solution concentrations of monovalent (NaCl) and divalent (CaCl_2) salts. Increasing salt concentration and adding divalent calcium ions induced SWNT aggregation by screening electrostatic charge and thereby suppressing electrostatic repulsion, similar to observations with aquatic colloidal particles. The presence of biomacromolecules significantly retarded the SWNT aggregation rate. BSA protein molecules were most effective in reducing the rate of aggregation followed by SRHA, LB, and alginate. The slowing of the SWNT aggregation rate in the presence of the biomacromolecules and SRHA can be attributed to steric repulsion originating from the adsorbed macromolecular layer. The remarkably enhanced SWNT stability in the presence of BSA, compared to that with the other biomacromolecules and SRHA, is ascribed to the BSA globular molecular structure that enhances steric repulsion. The results have direct implications for the fate and behavior of SWNTs in aquatic environments and biological media.
机译：使用时间分辨动态光散射研究了单壁碳纳米管（SWNTs）的初始聚集动力学。在天然有机物[Suwannee River腐殖酸（SRHA）]，多糖（藻酸盐），蛋白质[牛血清白蛋白（BSA）]和细胞培养基[Luria-Bertani（LB）肉汤]存在下评估SWNT的聚集。具有不同浓度的一价（NaCl）和二价（CaCl_2）盐溶液。盐浓度的增加和二价钙离子的添加​​会通过筛选静电荷来诱导SWNT聚集，从而抑制静电排斥，这与水生胶体颗粒的观察结果相似。生物大分子的存在显着阻碍了SWNT的聚集速率。 BSA蛋白分子在降低聚集速率方面最有效，其次是SRHA，LB和藻酸盐。在存在生物大分子和SRHA的情况下，SWNT聚集速率的减慢可归因于源自吸附大分子层的空间排斥。与其他生物大分子和SRHA相比，在BSA存在下SWNT稳定性显着增强归因于BSA球状分子结构增强了空间排斥力。结果直接影响单壁碳纳米管在水生环境和生物介质中的命运和行为。

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  • 来源
    《Environmental Science & Technology》 |2010年第7期|p.2412-2418|共7页
  • 作者

    NAVID B. SALEH; LISA D. PFEFFERLE; MENACHEM ELIMELECH;

  • 作者单位

    Department of Civil and Environmental Engineering, University of South Carolina, Columbia, South Carolina 29208;

    Department of Chemical Engineering, Environmental Engineering Program, Yale University, New Haven, Connecticut 06520-8286;

    Department of Chemical Engineering, Environmental Engineering Program, Yale University, New Haven, Connecticut 06520-8286;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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