Spongy all-in-liquid materials by in-situ formation of emulsions at oil-water interfaces

被引:21
作者
Bazazi, Parisa [1 ]
Stone, Howard A. [2 ]
Hejazi, S. Hossein [1 ]
机构
[1] Univ Calgary, Dept Chem & Petr Engn, Calgary, AB T2N 1N, Canada
[2] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA
基金
加拿大自然科学与工程研究理事会;
关键词
PARTICLE-STABILIZED EMULSIONS; INVERSION; SURFACTANTS; DIFFUSION;
D O I
10.1038/s41467-022-31644-2
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
All-in-liquid printing promises applications from energy storage to drug delivery and tissue engineering. Here, authors present the in-situ generation of layered emulsion in a fraction of a second at the oil-water interface forming 3D tube-like structures in a liquid medium. Printing a structured network of functionalized droplets in a liquid medium enables engineering collectives of living cells for functional purposes and promises enormous applications in processes ranging from energy storage to tissue engineering. Current approaches are limited to drop-by-drop printing or face limitations in reproducing the sophisticated internal features of a structured material and its interactions with the surrounding media. Here, we report a simple approach for creating stable liquid filaments of silica nanoparticle dispersions and use them as inks to print all-in-liquid materials that consist of a network of droplets. Silica nanoparticles stabilize liquid filaments at Weber numbers two orders of magnitude smaller than previously reported in liquid-liquid systems by rapidly producing a concentrated emulsion zone at the oil-water interface. We experimentally demonstrate the printed aqueous phase is emulsified in-situ; consequently, a 3D structure is achieved with flexible walls consisting of layered emulsions. The tube-like printed features have a spongy texture resembling miniaturized versions of "tube sponges" found in the oceans. A scaling analysis based on the interplay between hydrodynamics and emulsification kinetics reveals that filaments are formed when emulsions are generated and remain at the interface during the printing period. Stabilized filaments are utilized for printing liquid-based fluidic channels.
引用
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页数:10
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