Comparison of Hydrophilicity and Mechanical Properties of Nanocomposite Membranes with Cellulose Nanocrystals and Carbon Nanotubes
Comparison of Hydrophilicity and Mechanical Properties of Nanocomposite Membranes with Cellulose Nanocrystals and Carbon Nanotubes
复制标题
纤维素纳米晶与碳纳米管纳米复合膜的亲水性和力学性能比较
DOI：
10.1021/acs.est.6b04280
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发表时间：
2017-01-03
影响因子：
11.4
通讯作者：
Wiesner, Mark R.
中科院分区：
文献类型：
--
作者：
Bai, Langming;Bossa, Nathan;Wiesner, Mark R.
纤维素纳米晶体（CNCs）固有的亲水性和机械强度使其成为碳纳米管（CNTs）的可能替代品，碳纳米管在应用水处理膜时可能会提出较少的反对意见。本文对CNCs和cnt纳米复合聚醚砜（PES）膜的亲水性和力学性能进行了表征和比较。用扫描电镜（SEM）分析了膜孔几何形状。采用干湿法计算总孔隙率和平均孔隙半径。结果表明，在CNC- m和CNT-M复合膜的顶层，聚醚砜（PES）聚合物被松散地包裹。CNC-M的孔隙率大于CNT-M。通过水接触角、内聚自由能和水通量来测量的膜亲水性，可以通过在疏水聚合物膜上添加CNTs或功能化CNTs来提高。CNC-M的亲水性优于CNT-M。此外，CNC-M和CNT-M的杨氏模量和抗拉强度都得到了提高。虽然与CNTs相比，需要更小浓度的CNTs才能实现杨氏模量的相同增加，但cnc -复合膜的弹性更大。
The inherent properties of hydrophilicity and mechanical strength of cellulose nanocrystals (CNCs) make them a possible alternative to carbon nanotubes (CNTs) that may present feWer objections to application water-treatment membranes. In this work, the hydrophilicity and mechanical properties of CNCs and CNTs nanocomposite poly(ether sulfone) (PES) membranes were characterized and compared. Membrane pore geometry was analyzed by scanning electron microscopy (SEM). Overall porosity and mean pore radius -were calculated based on a wet-dry method. Results showed that PES polymers were loosely packed in the top layer of both the CNC- and CNT-composite membranes (CNC-M and CNT-M). The porosity of the CNC-M was greater than that of the CNT-M. Membrane hydrophilicity, measured by water-contact angle, free energy of cohesion, and water flux, was increased through the addition of either CNCs or functionalized CNTs to an otherwise hydrophobic polymer membrane. The hydrophilicity of the CNC-M was greater than the CNT-M. In addition, the Young's modulus and tensile strength was enhanced for both the CNC-M and CNT-M. While smaller concentrations of CNTs were required to achieve an equal increase in Young's modulus compared with the CNCs, the elasticity of the CNC-composite membranes was greater.