当前位置:科学网首页 > 小柯机器人 >详情
化学引发液滴纤维的聚结与反应活性
作者:小柯机器人 发布时间:2021/4/7 13:02:37

美国马萨诸塞大学阿默斯特分校Todd Emrick团队报道了化学引发液滴纤维的聚结与反应活性。相关研究成果发表于2021年4月1日出版的《美国化学会杂志》。

研究人员描述了功能性高分子表面活性剂在液滴基纤维的构建和引发崩塌中的作用,以及这些宏观超胶体结构在试剂区隔中的应用。研究人员合成了同时含有两性离子和叔胺基团的共聚物表面活性剂,用于稳定水滴中的油,其中所选两性离子的自粘附性赋予液滴间粘附性,而胺基团提供了pH触发聚结的途径。

研究人员将试剂包埋在纤维的空间不同组分中,通过液滴挤出法制备了宏观纤维。当连续水相酸化时,聚合物表面活性剂的质子化会增加其亲水性,并导致纤维迅速断裂和崩解。这些超胶态纤维的交联形式在酸化后是稳定的,并且似乎可以沿着纤维长度引导密封剂的液滴间通道。

总的来说,该功能性的、响应性强的乳液提供了一种得益于系统的界面化学的软材料结构在需要时产生化学反应的策略。

附:英文原文

Title: Chemically Triggered Coalescence and Reactivity of Droplet Fibers

Author: Jing Zhao, Zehao Pan, Deborah Snyder, Howard A. Stone, Todd Emrick

Issue&Volume: April 1, 2021

Abstract: We describe the role of functional polymer surfactants in the construction and triggered collapse of droplet-based fibers and the use of these macroscopic supracolloidal structures for reagent compartmentalization. Copolymer surfactants containing both zwitterionic and tertiary amine pendent groups were synthesized for stabilization of oil-in-water droplets, in which the self-adherent properties of the selected zwitterions impart interdroplet adherence, while the amine groups provide access to pH-triggered coalescence. Macroscopic fibers, obtained by droplet extrusion, were prepared with reagents embedded in spatially distinct components of the fibers. Upon acidification of the continuous aqueous phase, protonation of the polymer surfactants increases their hydrophilicity and causes rapid fiber disruption and collapse. Cross-linked versions of these supracolloidal fibers were stable upon acidification and appeared to direct interdroplet passage of encapsulants along the fiber length. Overall, these functional, responsive emulsions provide a strategy to impart on-demand chemical reactivity to soft materials structures that benefits from the interfacial chemistry of the system.

DOI: 10.1021/jacs.1c02576

Source: https://pubs.acs.org/doi/10.1021/jacs.1c02576

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000