Laser fabrication of light/voltage-responsive slippery liquid-infused porous substrate (SLIPS)

Jiao Zhizhen; Han Xingchen; Zhou Hao; Han Dongdong

doi:10.12086/oee.2022.210356

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Jiao Z Z, Han X C, Zhou H, et al. Laser fabrication of light/voltage-responsive slippery liquid-infused porous substrate (SLIPS)[J]. Opto-Electron Eng, 2022, 49(2): 210356. doi: 10.12086/oee.2022.210356

Citation:

Jiao Z Z, Han X C, Zhou H, et al. Laser fabrication of light/voltage-responsive slippery liquid-infused porous substrate (SLIPS)[J]. Opto-Electron Eng, 2022, 49(2): 210356. doi: 10.12086/oee.2022.210356

Laser fabrication of light/voltage-responsive slippery liquid-infused porous substrate (SLIPS)

1.
State Key Laboratory of Integrated Optoelectronics College, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin 130012, China
2.
Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China

Fund Project: Key Laboratory of Icing and Anti/De-icing of CARDC (IADL20210404), National Natural Science Foundation of China (61905087), and Fundamental Research Funds for the Central Universities (2020-JCXK-18)

More Information

Corresponding author: handongdong@jlu.edu.cn

Received Date 10 November 2021

Revised Date 26 January 2022

Published Date 25 February 2022

Abstract

Abstract

Inspired by the nepenthes in nature, slippery liquid-infused porous substrates (SLIPS) have attracted extensive research attentions. In this work, a graphene @ polyvinylidene fluoride (G@PVDF) composite substrate was ablated by a laser technology. Then paraffin is uniformly filled in the grooves by a thermal spin-coating method. A confocal laser scanning microscope and a scanning electron microscope were used to characterize the surface morphology and depth of the grooves. UV3600 and Infrared thermal imagers were used to test the absorption and photothermal characteristics of the samples. The droplet is "pinned" on the surface without light irradiation. Since graphene has excellent photothermal conversion capability, the photothermal conversion happens upon light irradiation. The temperature is high enough to melt the paraffin, the interface state changes from the friction gas-liquid-solid interface to a smooth gas-liquid-lubricant-solid interface. The droplet can slide at an inclination angle of about 10° without leaving any residues. In addition, the droplet sliding can be controlled by an external voltage. This work shows potentials in manipulating the behavior of droplets.
- laser fabrication /
- graphene /
- slippery surface /
- wettability

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References

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Overview

Overview

A slippery liquid-infused porous surface (SLIPS) inspired by nepenthes plays a significant effect in anti-adhesion, drag reduction, and droplet/bubble transportation etc. The SLIPS is constructed by infusing low surface energy lubricating liquid into the porous substrate. On the one hand, the porous substrate can firmly lock the lubricating liquid within the porous network. On the other hand, the lubricating liquid can dynamically flow in the porous substrate. Therefore, SLIPS shows the advantage of repelling complex liquids (blood, crude oil, etc.), self-healing, and high-pressure resistance, etc. For the intelligent responsive SLIPS, stimulus-response substances are added to the porous substrate, and then the surface wettability can be switched by external stimuli such as electric field, light, etc. Since droplets can be manipulated more precisely, the intelligent responsive SLIPS has broader prospects. In this study, graphene was added to the PVDF solution and thermal drying was performed to form a membrane. This leads to the obvious improvement of light absorption and photothermal conversion compared to that of the membrane without graphene. Then, a UV laser was used to ablate the graphene/polyvinylidene fluoride (G@PVDF) composite film surface for fabricating the grid-like grooves. Then paraffin was poured into the grooves by a thermal spin-coating method to well fill the grooves. In this process, the paraffin was melted or solidified by switching ON and OFF states of the light source, realizing the non-contact controllable manipulation of the droplet. When there is no light, there is a solid-liquid interface between the droplet and surface, and the droplet is "pinned" on the surface. As graphene has excellent light-to-heat conversion ability, the heat is enough to make the phase-change material paraffin melt when the light is on. The interface state between the water droplet and surface changes from the friction gas-liquid-solid interface to a smooth gas-liquid-lubricant-solid interface. The droplet can easily slide at an inclination angle of about 10° without leaving any residues. Alternatively, we employed laser-induced graphene (LIG) on a polyimide film as a heat source, and attached the SLIPS on the LIG. By applying voltage on LIG, it is also able to dynamically control the states of droplets. This kind of light/voltage-controlled SLIPS to control droplet behaviors is of great significance in anti-adhesion, biomedical, microfluidic devices, and other fields.