A mechanical hand-like functional surface capable of efficiently grasping and non-destructively releasing droplets

Liu, Ming; Li, Chenghao; Peng, Zhilong; Yao, Yin; Chen, Shaohua

doi:10.1016/j.cej.2021.132749

Cited by 12 publications

(23 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The film doped with magnetic particles is schematically shown in Figure S2a of the Supporting Information. Applying an external magnetic field, the magnetic moment acting on each magnetic particle is produced instantaneously, which is different from each other. , Therefore, the polymer matrix surrounding magnetic particles moves with the movement of magnetic particles, which leads to significantly changes in the surface roughness. ,,− …”

Section: Resultsmentioning

confidence: 99%

“…Applying an external magnetic field, the magnetic moment acting on each magnetic particle is produced instantaneously, which is different from each other. 36,41 Therefore, the polymer matrix surrounding magnetic particles moves with the movement of magnetic particles, which leads to significantly changes in the surface roughness. 38,39,46−48 To make the surface of the film respond better to the external magnetic field, it is necessary to study the optimal content of CIPs in the polymer matrix before adding the softener and coating the lubricating layer.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The tunable micro/nanostructures that can respond to electric, − thermal, , chemical, , or magnetic − stimuli broaden the technique of droplet transport. As a result of the advantage of remote controllability and instantaneous response, the magnetic field is considered to have great potential to actuate the surface morphology .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simple but Efficient Method To Transport Droplets on Arbitrarily Controllable Paths

Liu

Peng

et al. 2022

Langmuir

Self Cite

View full text Add to dashboard Cite

The flexible manipulation of droplets manifests a wide spectrum of applications, such as micro-flow control, drug-targeted therapy, and microelectromechanical system heat dissipation. How to realize the efficient control of droplets has become a problem of concern. In this paper, a simple method that can realize the transport of droplets along any controllable path is proposed. It not only has a simple preparation process and clear transport mechanism but is also easy to realize in manipulation technology. A magnetic-sensitive surface is prepared by filling a polymer matrix with magnetic particles and immersing in a lubricant. Under the action of an external magnetic field, rough microstructures are generated locally on the surface, forming the wettability gradient with the area far away from the field. Moving the magnetic field, the wettability gradient region moves accordingly and drives droplets to transport. To better control the transport path of droplets or realize a more complex path design, a ring-shaped magnetic field is further adopted, during which the droplet is automatically located in the ring-shaped region and moves with the movement of the ring-shaped magnetic field. The present technique is simple and easy to implement, which should be helpful in the field of precise regulation of the droplet position.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Simple but Efficient Method To Transport Droplets on Arbitrarily Controllable Paths

Liu

Peng

et al. 2022

Langmuir

Self Cite

View full text Add to dashboard Cite

show abstract

“…The droplets deposited on the lotus leaf or rose petal both exhibit a high contact angle (>150°). However, the droplet is able to roll off the lotus leaf with rare effort − but stays pinned even when the petal is turned upside down. , Petal effects have various applications in multiple areas, − such as microdroplet transport, small volume liquid analysis, and so forth. However, the rose petals’ high water adhesion mechanism remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation on the Wettability of Nanoscale Wrinkles: High Water Adhesion of Rose Petals

et al. 2022

View full text Add to dashboard Cite

Understanding the high water adhesion of rose petals is of great significance in artificial surface design. With all-atom molecular dynamics simulation, the wettability of nanoscale wrinkles was explored and compared to that of nanoscale strips with favorable hydrophobicity. The dewetting and wetting of gaps between nanoscale structures represent the Cassie–Baxter (CB) and Wenzel (WZ) states of the macroscopic droplet deposited on the textured surface, respectively. We uncovered the intermediate state, which is different from the CB and WZ states for wrinkles. Structures and free-energy profiles of metastable and transition states under various pressures were also investigated. Moreover, free-energy barriers for the (de)wetting transitions were quantified. On this basis, the roles of pressure and the unique structures of nanoscale wrinkles in the high water adhesion of rose petals were identified.

show abstract

“…Inspired by these novel phenomena, many functional surfaces are well designed and fabricated − to achieve the asymmetric transport of droplets or solid objects. ,− For droplet transport, the disparity of the surface energy and physical structure were always considered. Chaudhury and Whitesides reported that a surface with spatial gradient can drive the surface droplets to move uphill, since the unbalanced capillary force acting on the three-phase contact line of the droplet was induced by the asymmetric geometry.…”

Section: Introductionmentioning

confidence: 99%

Locust-Inspired Direction-Dependent Transport Based on a Magnetic-Responsive Asymmetric-Microplate-Arrayed Surface

Liu

Yao

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Inspired by the highly efficient jumping mechanism of locusts, a magnetic-responsive asymmetric-microplate-arrayed surface is designed. Elastic energy can be stored in the microplate and rapidly released by loading and removing a magnetic field. Similar to the bouncing behavior of the locust, objects deposited on the surface of the microplate-arrayed surface will bounce suddenly. It is found that the continuous transport behavior can be induced in the moving magnetic field and the direction-dependent transport is well achieved by preparing the secondary microstructure. The results show that both the weight and transport velocity of the transported object in the forward transport direction are much greater than those in the reverse transport direction. Furthermore, the anisotropic transport property can be strengthened with the increase of the height of the secondary structure. Such surfaces can transport objects with either soft or hard stiffness, as well as objects with different geometric configurations, and the transport path can be arbitrarily programmed. Based on the transport mechanism, a flexible microconvey belt is further designed, which can transport objects in any controlled direction. Such a simple technique can provide new design ideas for directional microtransport requirements.

show abstract

A mechanical hand-like functional surface capable of efficiently grasping and non-destructively releasing droplets

Cited by 12 publications

References 54 publications

Simple but Efficient Method To Transport Droplets on Arbitrarily Controllable Paths

Simple but Efficient Method To Transport Droplets on Arbitrarily Controllable Paths

Molecular Dynamics Simulation on the Wettability of Nanoscale Wrinkles: High Water Adhesion of Rose Petals

Locust-Inspired Direction-Dependent Transport Based on a Magnetic-Responsive Asymmetric-Microplate-Arrayed Surface

Contact Info

Product

Resources

About