Tailoring the surface properties of porous zeolite constructs using plasma processing
Tailoring the surface properties of porous zeolite constructs using plasma processing
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DOI：
10.1016/j.micromeso.2020.110467
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发表时间：
2020-11
影响因子：
5.2
通讯作者：
Angela R. Hanna;E. R. Fisher
中科院分区：
文献类型：
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作者：
Angela R. Hanna;E. R. Fisher
沸石广泛用于吸附、催化和气体分离;然而，这些应用的相对有效性本质上受到材料表面性质的影响。等离子体改性提供了解决这些问题的理想方法，因为它具有广泛的参数范围和创建定制表面功能的潜力。在此，研究了通过等离子体处理的沸石改性，沿着不同沸石构造的制造（即，天然沸石、粒料和静电纺丝纤维）。水接触角测角法用于评估表面润湿性，注意到未处理的沸石名义上是亲水的。我们探索了使用氟碳化合物和H2O（v）感应耦合等离子体来调节微孔NaX沸石在一系列操作条件下的润湿性。具体地，在C3 F8等离子体暴露后，测量的接触角范围为123.9 °至138.2°，这取决于等离子体处理参数。通过X射线光电子能谱和扫描电子显微镜分析验证了氟碳膜的形成。C2 F6和H2O（V）等离子体暴露增加水的吸收率，作为表面蚀刻和功能化的结果，分别。光学发射光谱被用来探测气相物质，收集材料如何内在地改变等离子体环境。我们的研究揭示了气相光谱分析，气体-表面界面，和由此产生的等离子体改性的表面性质之间的相关性，最终导致改进等离子体工艺。
Zeolites are widely used in adsorption, catalysis, and gas separations; however, the relative effectiveness of these applications is inherently impacted by material surface properties. Plasma modification presents an ideal methodology to address these issues, as it has an extensive parameter range and the potential to create tailored surface functionalities. Here, zeolite modification via plasma processing was investigated, along with the fabrication of different zeolite constructs (i.e., native zeolites, pellets and electrospun fibers). Water contact angle goniometry was employed to evaluate surface wettability, noting that untreated zeolites are nominally hydrophilic. We explored the use of fluorocarbon and H2O(v)inductively coupled plasmas to tune the resulting wettability of microporous NaX zeolites over a range of operating conditions. Specifically, after C3F8plasma exposure, contact angles ranging from 123.9 to 138.2° were measured, depending on plasma treatment parameters. Formation of a fluorocarbon film was verified via X-ray photoelectron spectroscopy and scanning electron microscopy analyses. C2F6and H2O(v)plasma exposure increased water absorption rates, as a consequence of surface etching and functionalization, respectively. Optical emission spectroscopy was used to probe gas-phase species, gleaning how the material intrinsically changes the plasma environment. Our studies revealed correlations between gas-phase spectroscopic analyses, the gas-surface interface, and the resulting plasma modified surface properties, ultimately leading to improved plasma processes.