Study of stable liquid crystal(LC)microdroplets is of great significance for LC dynamics in con fined space or at topological surface.However,the fabrication of LC microdroplets with diverse shape without ionic gelati...Study of stable liquid crystal(LC)microdroplets is of great significance for LC dynamics in con fined space or at topological surface.However,the fabrication of LC microdroplets with diverse shape without ionic gelati on agents still remai ns challe nging due to the fluid instability.Here,we utilize the microfluidic tech no logy to prepare graphe ne oxide(GO)LC microdroplets with various morphologies based on the anomalous rheological property of GO aqueous dispersion.Different from LC of one-dimensional polymer,LC containing two-dimensional GO sheets exhibits considerable viscoelasticity and weak extensibility,resulting from the planar molecular conformation and the absence of intermolecular entangleme nts.The low exte risibility ensures that GO aqueous suspension is discretized into mono dispersed microdroplets rather than thin thread in the microfluidic channels.The large viscoelasticity and ultra-1 ong relaxation time of GO LC enable the diverse stable morphologies of microdroplets.The droplet morphology is well con trolled from sphere to teardrop by modulati ng the competition between GO viscoelasticity and in terfacial ten sion.The two-dimensional GO LC featuri ng unique rheological property provides a novel system for the microfluidic field,and corresponding topological stability enriches the LC dyn amics and ope ns a new pathway for desig ning graphe ne-based materials.展开更多
基金by the National Natural Science Foundation of China(Nos.52090030,51533008,51703194,51973191,51873191 and 51803177)National Key R&D Program of China(No.2016YFA0200200),Hundred Talents Program of Zhejiang University(No.188020*194231701/113),Key Research and Development Plan of Zhejiang Province(2018C01049)+1 种基金the Fundamental Research Funds for the Central Universities(No.K20200060)Key Laboratory of Novel Adsorpti on and Separati on Materials and Applicatio n Technology of Zhejiang Province(No.512301-121502).
文摘Study of stable liquid crystal(LC)microdroplets is of great significance for LC dynamics in con fined space or at topological surface.However,the fabrication of LC microdroplets with diverse shape without ionic gelati on agents still remai ns challe nging due to the fluid instability.Here,we utilize the microfluidic tech no logy to prepare graphe ne oxide(GO)LC microdroplets with various morphologies based on the anomalous rheological property of GO aqueous dispersion.Different from LC of one-dimensional polymer,LC containing two-dimensional GO sheets exhibits considerable viscoelasticity and weak extensibility,resulting from the planar molecular conformation and the absence of intermolecular entangleme nts.The low exte risibility ensures that GO aqueous suspension is discretized into mono dispersed microdroplets rather than thin thread in the microfluidic channels.The large viscoelasticity and ultra-1 ong relaxation time of GO LC enable the diverse stable morphologies of microdroplets.The droplet morphology is well con trolled from sphere to teardrop by modulati ng the competition between GO viscoelasticity and in terfacial ten sion.The two-dimensional GO LC featuri ng unique rheological property provides a novel system for the microfluidic field,and corresponding topological stability enriches the LC dyn amics and ope ns a new pathway for desig ning graphe ne-based materials.
