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Download fileScalable Manufacturing of Hierarchical Biphasic Bicontinuous Structures via Vaporization-Induced Phase Separation (VIPS)
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posted on 20.04.2020, 17:39 authored by Tiancheng Wang, Giuseppe Di Vitantonio, Kathleen J. Stebe, Daeyeon LeeStudies
of particle-stabilized biphasic structures have greatly
expanded the possibilities of multiphasic systems by producing liquid
composites with unique morphologies and properties. The solvent transfer-induced
phase separation (STRIPS) method was previously introduced to prepare
bicontinuous interfacially jammed emulsion gels (bijels), a unique
class of particle-stabilized biphasic structures. Although STRIPS
enables continuous processing, the requirement of an external aqueous
phase may limit its application. In this work, a new method to produce
a variety of three-dimensional multiphasic structures including bijels
via vapor-induced phase separation (VIPS) is demonstrated. VIPS enables
the fabrication of films and coatings by spreading or spraying a particle-laden
suspension onto a surface without the need of an outer aqueous phase.
Intriguingly, secondary nucleation of structures occurs within phase
separated domains, leading to hierarchically bicontinuous biphasic
structures. The dimensions of phase separated domains can be controlled
by the rate of cosolvent removal. Moreover, a different path to bicontinuous
morphology is identified, which does not occur via spinodal decomposition
but rather relies on the formation of percolating structures of partially
coalesced particle-covered droplets. The VIPS process provides a scalable
path to produce bicontinuous biphasic composites with hierarchical
structures for advanced coatings and membranes applications.
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Keywords
multiphasic systemsparticle-laden suspensionparticle-covered dropletsmultiphasic structuresspinodal decompositionbicontinuous morphologybicontinuous biphasic compositesvapor-induced phase separationscalable pathparticle-stabilized biphasic structuresSTRIPSScalable Manufacturingbicontinuous interfaciallyVIPS processmembranes applicationsVaporization-Induced Phase Separationtransfer-induced phase separationHierarchical Biphasic Bicontinuous Structureshierarchically bicontinuous biphasic structurescosolvent removalpercolating structures