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Graphitic Carbon Nitride Stabilizers Meet Microfluidics: From Stable Emulsions to Photoinduced Synthesis of Hollow Polymer Spheres.
Small ( IF 13.0 ) Pub Date : 2020-07-02 , DOI: 10.1002/smll.202001180
Naresh Yandrapalli 1 , Tom Robinson 1 , Markus Antonietti 2 , Baris Kumru 2
Affiliation  

Graphitic carbon nitride (g‐CN) has been utilized as a heterogeneous catalyst, but is usually not very well dispersible. The amphiphilic character of g‐CN can be altered by surface modifications of g‐CN nanopowders. Introducing hydrophilicity or hydrophobicity is a promising avenue for producing advanced emulsion systems. In this study, a special surface‐modified g‐CN is used to form stable Pickering emulsions. Using a PDMS‐based microfluidic device designed for stable production of both single and double emulsions, it is shown that surface‐modified g‐CNs allow the manufacture of unconventionally stable and precise Pickering emulsions. Shell thickness of the double emulsions is varied to emphasize the robustness of the device and also to demonstrate the extraordinary stabilization brought by the surface‐modified carbon nitride used in this study. Due to the electrostatic stabilization also in the oil phase, double emulsions are centered. Finally, when produced from polymerizable styrene, hollow polymer microparticles are formed with precise and tunable sizes, where g‐CN is utilized as the only stabilizer and photoinitiator.

中文翻译:

石墨碳氮化物稳定剂满足微流体技术的要求:从稳定的乳液到空心聚合物球的光诱导合成。

石墨碳氮化物(g-CN)已用作多相催化剂,但通常分散性不高。g-CN的两亲特性可通过g-CN纳米粉的表面改性来改变。引入亲水性或疏水性是生产高级乳液体系的有希望的途径。在本研究中,使用特殊的表面改性g-CN形成稳定的Pickering乳液。使用基于PDMS的微流控设备设计用于稳定生产单乳剂和双乳剂,结果表明,表面改性的g-CN可以生产非常规的稳定和精确的Pickering乳剂。改变了双乳胶的外壳厚度,以强调设备的耐用性,并展示了本研究中使用的表面改性氮化碳带来的非凡稳定性。由于在油相中也具有静电稳定作用,因此双重乳液居中。最后,当用可聚合苯乙烯生产时,会形成尺寸精确且可调的中空聚合物微粒,其中g-CN被用作唯一的稳定剂和光引发剂。
更新日期:2020-08-14
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