U.S. Environmental Protection Agency , Athens, Georgia 30605, United States.
Environ Sci Technol. 2013 Sep 17;47(18):10372-80. doi: 10.1021/es402200h. Epub 2013 Sep 3.
Deposition of multiwalled carbon nanotubes (MWNTs) on model environmental surfaces was investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D). Deposition behaviors of MWNTs on positively and negatively charged surfaces were in good agreement with Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, although hydrophobic interactions dominated MWNTs deposition on a hydrophobic polystyrene surface. Initial deposition rates (rf) and deposition attachment efficiencies (αD) depended on solution ionic strengths (IS) and surface electrostatic properties. Identical rf and αD values at constant IS on similar surfaces suggested that deposition was insensitive to surface morphology (i.e., bare crystal surface vs coated surface). The dissipation unit (D) was used with frequency (f) to investigate nanoparticle deposition: |ΔD/Δf| values varied for deposition on different surfaces, indicating that the nature of MWNT association with surfaces varied despite constant rf and αD values.
采用石英晶体微天平（QCM-D）监测耗散，研究了多壁碳纳米管（MWNTs）在模型环境表面上的沉积。尽管疏水相互作用主导了 MWNTs 在疏水聚苯乙烯表面上的沉积，但 MWNTs 在带正电荷和带负电荷表面上的沉积行为与德贾林-兰德维维尔-奥弗贝克（DLVO）理论吻合良好。初始沉积速率（rf）和沉积附着效率（αD）取决于溶液离子强度（IS）和表面静电特性。在相似表面上，恒定 IS 下相同的 rf 和 αD 值表明，沉积对表面形貌（即裸露晶体表面与涂层表面）不敏感。耗散单元（D）与频率（f）一起用于研究纳米颗粒的沉积：|ΔD/Δf|值在不同表面上的沉积变化表明，尽管 rf 和αD 值保持不变，但 MWNT 与表面的结合性质有所不同。
