On-Flow Immobilization of Polystyrene Microspheres on β-Cyclodextrin-Patterned Silica Surfaces through Supramolecular Host-Guest Interactions.,ACS Applied Materials & Interfaces

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On-Flow Immobilization of Polystyrene Microspheres on β-Cyclodextrin-Patterned Silica Surfaces through Supramolecular Host-Guest Interactions.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-09-18 , DOI: 10.1021/acsami.9b11069
Stan B J Willems _{1,

2,

3} , Anton Bunschoten _{1,

2} , R Martijn Wagterveld ₃ , Fijs W B van Leeuwen _{1,

2} , Aldrik H Velders _{1,

2}

Affiliation

Species-specific isolation of microsized entities such as microplastics and resistant bacteria from waste streams is becoming a growing environmental challenge. By studying the on-flow immobilization of micron-sized polystyrene particles onto functionalized silica surfaces, we ascertain if supramolecular host-guest chemistry in aqueous solutions can provide an alternative technology for water purification. Polystyrene particles were modified with different degrees of adamantane (guest) molecules, and silica surfaces were patterned with β-cyclodextrin (β-CD, host) through microcontact printing (μCP). The latter was exposed to solutions of these particles flowing at different speeds, allowing us to study the effect of flow rate and multivalency on particle binding to the surface. The obtained binding profile was correlated with Comsol simulations. We also observed that particle binding is directly aligned with particle's ability to form host-guest interactions with the β-CD-patterned surface, as particle binding to the functionalized glass surface increased with higher adamantane load on the polystyrene particle surface. Because of the noncovalent character of these interactions, immobilization is reversible and modified β-CD surfaces can be recycled, which provides a positive outlook for their incorporation in water purification systems.

中文翻译：

通过超分子主体-客体相互作用将聚苯乙烯微球固定在β-环糊精填充的二氧化硅表面上。

从废物流中特定种类的微小实体（如微塑料和抗性细菌）的分离正成为日益严峻的环境挑战。通过研究将微米尺寸的聚苯乙烯颗粒固定在功能化的二氧化硅表面上的流动性，我们确定水溶液中的超分子主客体化学物质是否可以提供水纯化的替代技术。用不同程度的金刚烷（客体）分子修饰聚苯乙烯颗粒，并通过微接触印刷（μCP）用β-环糊精（β-CD，主体）对二氧化硅表面进行构图。后者暴露于这些以不同速度流动的颗粒的溶液中，从而使我们能够研究流速和多价对颗粒与表面结合的影响。获得的结合曲线与Comsol模拟相关。我们还观察到，粒子结合与粒子与β-CD图案表面形成主体-客体相互作用的能力直接匹配，因为随着聚苯乙烯粒子表面上较高的金刚烷负载，粒子与功能化玻璃表面的结合增加。由于这些相互作用的非共价特性，固定化是可逆的，修饰的β-CD表面可以回收利用，这为将其掺入水净化系统提供了积极的前景。

更新日期：2019-09-18

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