The manipulation of fast,unidirectional motion for large droplets shows important applications in the fields of fog collection and biochemical reactions.However,driving large droplets(>5μL)to move directionally an...The manipulation of fast,unidirectional motion for large droplets shows important applications in the fields of fog collection and biochemical reactions.However,driving large droplets(>5μL)to move directionally and quickly remains challenging due to the nonnegligible volume force.Herein,we fabricated a scalable,bionic peristome substrate with a microcavity width of 180μm using a 3D printing method,which could unidirectionally drive a large water droplet(~8μL)at a speed reaching 12.5 mm/s by temperature-responsive wettability.The substrate surface was grafted with PNIPAAm,which could reversibly change its wettability in response to temperature,thereby enabling a temperature-responsive smart surface that could regulate droplet movement in real-time by changing the temperature.A series of temperature-responsive smart patterns were designed to induce water transport along specific paths to further realize controllable droplet motion with the antibacterial treatment of predesignated areas.The ability to achieve temperature-responsive unidirectional motion and dynamic control of droplet movement could allow programmable fluidic biosensors and precision medical devices.展开更多
As a result of frequent food waste and environmental pollution,there has been an increasing demand for the development of packaging materials that intrinsically inhibit and reduce likelihood of non-Newtonian liquids a...As a result of frequent food waste and environmental pollution,there has been an increasing demand for the development of packaging materials that intrinsically inhibit and reduce likelihood of non-Newtonian liquids adherence.In this work,inspired from ciliary structures on the leg of water strider,the hierarchical conical array was formed by magnetic field control and laser etching without any mask.Due to the tapered geometry of the cones and the multiscale surface roughness of the array,the droplets would bounce many times after impacting with the superhydrophobic surface(SHS)and roll off.By changing the spaces and apex angles of conical microcolumns the SHS has controlled adhesion,superior self-cleaning property and droplets bounce performance for a variety of non-Newtonian viscous liquids.After suffering from various types of damage including repeated tape tearing,finger touch and folding test,the SHS still maintained excellent superhydrophobic property,which may have potential application as all kinds of packaging interface materials.We demonstrate that the excellent droplets bounce behavior of the hierarchical array enables the efficient and robust prevention of food liquids adhesion.展开更多
基金the National Natural Science Foundation of China(Nos.52005222,12272151,and 52105057)Major Program of National Natural Science Foundation of China(NSFC)for Basic Theory and Key Technology of Tri-Co Robots(92248301)+3 种基金Natural Science Foundation of Jiangsu Province(Grant no.BK20200916)Key Research Project of Zhejiang lab(No.K2022NB0AC04)Open Fund for Key Laboratory of Bionic Engineering(Ministry of Education)of Jilin University(K202207)Qing Lan Project and 333 Project of Jiangsu Province.
文摘The manipulation of fast,unidirectional motion for large droplets shows important applications in the fields of fog collection and biochemical reactions.However,driving large droplets(>5μL)to move directionally and quickly remains challenging due to the nonnegligible volume force.Herein,we fabricated a scalable,bionic peristome substrate with a microcavity width of 180μm using a 3D printing method,which could unidirectionally drive a large water droplet(~8μL)at a speed reaching 12.5 mm/s by temperature-responsive wettability.The substrate surface was grafted with PNIPAAm,which could reversibly change its wettability in response to temperature,thereby enabling a temperature-responsive smart surface that could regulate droplet movement in real-time by changing the temperature.A series of temperature-responsive smart patterns were designed to induce water transport along specific paths to further realize controllable droplet motion with the antibacterial treatment of predesignated areas.The ability to achieve temperature-responsive unidirectional motion and dynamic control of droplet movement could allow programmable fluidic biosensors and precision medical devices.
基金National Natural Science Foundation of China(Nos.52005222 and 51805048)China Postdoctoral Science Foundation(2020M671372)Natural Science Foundation of Jiangsu Province(BK20181036).
文摘As a result of frequent food waste and environmental pollution,there has been an increasing demand for the development of packaging materials that intrinsically inhibit and reduce likelihood of non-Newtonian liquids adherence.In this work,inspired from ciliary structures on the leg of water strider,the hierarchical conical array was formed by magnetic field control and laser etching without any mask.Due to the tapered geometry of the cones and the multiscale surface roughness of the array,the droplets would bounce many times after impacting with the superhydrophobic surface(SHS)and roll off.By changing the spaces and apex angles of conical microcolumns the SHS has controlled adhesion,superior self-cleaning property and droplets bounce performance for a variety of non-Newtonian viscous liquids.After suffering from various types of damage including repeated tape tearing,finger touch and folding test,the SHS still maintained excellent superhydrophobic property,which may have potential application as all kinds of packaging interface materials.We demonstrate that the excellent droplets bounce behavior of the hierarchical array enables the efficient and robust prevention of food liquids adhesion.
