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Zhao X, Park DS, Choi J, Park S, Soper SA, Murphy MC. Flexible-templated imprinting for fluorine-free, omniphobic plastics with re-entrant structures. J Colloid Interface Sci 2021; 585:668-675. [PMID: 33127056 PMCID: PMC8483707 DOI: 10.1016/j.jcis.2020.10.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 10/12/2020] [Accepted: 10/13/2020] [Indexed: 10/23/2022]
Abstract
HYPOTHESIS Compared to vertical micro-pillars, re-entrant micro-structures exhibited superior omniphobicity for suspending liquids to Cassie-Baxter state. However, the existing re-entrant structures rely on complex multi-step deposition and etching procedures. The conventional, rigid-templated imprinting would instead damage the re-entrant structures. This leads to the question: is it possible to preserve the re-entrant curvatures by a flexible-templated imprinting? EXPERIMENTS We facilely imprinted the re-entrant structures on a plastic substrate using a flexible nylon-mesh template. The effect of imprinting time (15-35 min), temperature (110-120 °C) and pressure (15-50 Bar) was investigated. To further improve the liquid-repellency and abrasion resistance, the silica nanoparticles (30-650 nm) along with epoxy resin binder (10 mg/mL) were pre-coated. FINDINGS A one-step imprinting is sufficient to fabricate the re-entrant structures by utilizing flexible nylon-mesh template, without damaging the imprinted structures after the demolding process. The pre-coated silica nanoparticles and epoxy resin (1) improved liquid repellency by introducing hierarchical surface structures (e.g. contact angle hysteresis of olive oil reduced > 10°), and (2) acted as a protective layer against mechanical abrasion (omniphobicity maintained after 25 cycles, ~1.6 kPa sand paper abrasion). Additionally, the fluorine-free post-treatment was sufficient for the omniphobicity on the obtained plastic structures.
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Affiliation(s)
- Xiaoxiao Zhao
- Center for BioModular Multiscale Systems for Precision Medicine, Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Daniel S Park
- Center for BioModular Multiscale Systems for Precision Medicine, Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Junseo Choi
- Center for BioModular Multiscale Systems for Precision Medicine, Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Sungook Park
- Center for BioModular Multiscale Systems for Precision Medicine, Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Steven A Soper
- Departments of Chemistry and Mechanical Engineering, University of Kansas, Lawrence, KS 66045, United States
| | - Michael C Murphy
- Center for BioModular Multiscale Systems for Precision Medicine, Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, United States.
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Li J, Wang W, Mei X, Pan A. Designable Ultratransparent and Superhydrophobic Surface of Embedded Artificial Compound Eye with Extremely Low Adhesion. ACS APPLIED MATERIALS & INTERFACES 2020; 12:53557-53567. [PMID: 33176099 DOI: 10.1021/acsami.0c18881] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Real-world implementation of artificial compound eye (ACE) has been limited by its poor transparency and high requirement for the stable Cassie state. In general, the improvement of surface dewetting performance sacrifices the transparency of ACE. Herein, ACE was obtained by an integrated manufacturing technology that combined photolithography, microprinting, and chemical growth. Through skillful manipulation of the fabrication process, dewetting hairs were fabricated on the top of micropillars and around the microlens. The combination of nanohairs and micropillars resulted in outstanding superhydrophobicity (∼170°), pristine lotus effect with low sliding angle (∼1°), and contact angle hysteresis (∼2°). Moreover, the surface showed almost no adhesion under a preload of 4 mN, exhibiting excellent stable Cassie state and antiadhesion performance. Furthermore, dynamic impact showed that the impacting droplet was quickly detached from the surface (contact time ∼14.1 ms) without sticking for We = 60. The designed transparency resulted in high performance of optical unit (∼99%, bare glass for comparison). Moreover, ACE exhibited better focusing and imaging capability under larger aperture diameter than microlens without nanohairs. We envision that this research presents a significant advancement in imparting superhydrophobicity and transparency to a so-far inapplicable family of optical devices for many practical outdoor applications.
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Affiliation(s)
- Jiang Li
- State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xian 710054, China
- Shaanxi Key Laboratory of Intelligent Robots, Xi'an Jiaotong University, Xian 710049, China
| | - Wenjun Wang
- State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xian 710054, China
- Shaanxi Key Laboratory of Intelligent Robots, Xi'an Jiaotong University, Xian 710049, China
| | - Xuesong Mei
- State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xian 710054, China
- Shaanxi Key Laboratory of Intelligent Robots, Xi'an Jiaotong University, Xian 710049, China
| | - Aifei Pan
- State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xian 710054, China
- Shaanxi Key Laboratory of Intelligent Robots, Xi'an Jiaotong University, Xian 710049, China
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Zhang L, Dong D, Shao L, Xia Y, Zeng T, Wang Y. Cost-effective one-pot surface modified method to engineer a green superhydrophobic sponge for efficient oil/water mixtures as well as emulsions separation. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Zouaghi S, Bellayer S, Thomy V, Dargent T, Coffinier Y, Andre C, Delaplace G, Jimenez M. Biomimetic surface modifications of stainless steel targeting dairy fouling mitigation and bacterial adhesion. FOOD AND BIOPRODUCTS PROCESSING 2019. [DOI: 10.1016/j.fbp.2018.10.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Xiao L, Deng M, Zeng W, Zhang B, Xu Z, Yi C, Liao G. Novel Robust Superhydrophobic Coating with Self-Cleaning Properties in Air and Oil Based on Rare Earth Metal Oxide. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b03131] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Liji Xiao
- Hubei
Collaborative Innovation Center for Advanced Organic Chemical Materials,
Ministry of Education Key Laboratory for The Green Preparation and
Application of Functional Materials, Hubei University, Wuhan, Hubei 430062, PR China
| | - Min Deng
- Hubei
Collaborative Innovation Center for Advanced Organic Chemical Materials,
Ministry of Education Key Laboratory for The Green Preparation and
Application of Functional Materials, Hubei University, Wuhan, Hubei 430062, PR China
| | - Weiguo Zeng
- Hubei
Collaborative Innovation Center for Advanced Organic Chemical Materials,
Ministry of Education Key Laboratory for The Green Preparation and
Application of Functional Materials, Hubei University, Wuhan, Hubei 430062, PR China
| | - Boxiao Zhang
- Hubei
Collaborative Innovation Center for Advanced Organic Chemical Materials,
Ministry of Education Key Laboratory for The Green Preparation and
Application of Functional Materials, Hubei University, Wuhan, Hubei 430062, PR China
| | - Zushun Xu
- Hubei
Collaborative Innovation Center for Advanced Organic Chemical Materials,
Ministry of Education Key Laboratory for The Green Preparation and
Application of Functional Materials, Hubei University, Wuhan, Hubei 430062, PR China
| | - Changfeng Yi
- Hubei
Collaborative Innovation Center for Advanced Organic Chemical Materials,
Ministry of Education Key Laboratory for The Green Preparation and
Application of Functional Materials, Hubei University, Wuhan, Hubei 430062, PR China
| | - Guangfu Liao
- Hubei
Collaborative Innovation Center for Advanced Organic Chemical Materials,
Ministry of Education Key Laboratory for The Green Preparation and
Application of Functional Materials, Hubei University, Wuhan, Hubei 430062, PR China
- School
of Materials Science and Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China
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Kim JH, Shim TS, Kim SH. Lithographic Design of Overhanging Microdisk Arrays Toward Omniphobic Surfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:291-298. [PMID: 26573776 DOI: 10.1002/adma.201503643] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 09/16/2015] [Indexed: 06/05/2023]
Abstract
Omniphobic surfaces are created by designing an array of overhanging microdisks on a polymer film through two steps of photolithography. Two distinct edges and the large height of the microdisks relative to their separation ensure the formation of an air mat under the microdisks, providing an omniphobic property. Moreover, the freestanding omniphobic films are transparent and flexible, potentially serving as liquid-repellent surfaces in various applications.
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Affiliation(s)
- Ju Hyeon Kim
- Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST, Daejeon, 34141, South Korea
| | - Tae Soup Shim
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
- Department of Chemical Engineering, Ajou University, Suwon, 16499, South Korea
| | - Shin-Hyun Kim
- Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST, Daejeon, 34141, South Korea
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Hensel R, Neinhuis C, Werner C. The springtail cuticle as a blueprint for omniphobic surfaces. Chem Soc Rev 2015; 45:323-41. [PMID: 26239626 DOI: 10.1039/c5cs00438a] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Omniphobic surfaces found in nature have great potential for enabling novel and emerging products and technologies to facilitate the daily life of human societies. One example is the water and even oil-repellent cuticle of springtails (Collembola). The wingless arthropods evolved a highly textured, hierarchically arranged surface pattern that affords mechanical robustness and wetting resistance even at elevated hydrostatic pressures. Springtail cuticle-derived surfaces therefore promise to overcome limitations of lotus-inspired surfaces (low durability, insufficient repellence of low surface tension liquids). In this review, we report on the liquid-repellent natural surfaces of arthropods living in aqueous or temporarily flooded habitats including water-walking insects or water spiders. In particular, we focus on springtails presenting an overview on the cuticular morphology and chemistry and their biological relevance. Based on the obtained liquid repellence of a variety of liquids with remarkable efficiency, the review provides general design criteria for robust omniphobic surfaces. In particular, the resistance against complete wetting and the mechanical stability strongly both depend on the topographical features of the nano- and micropatterned surface. The current understanding of the underlying principles and approaches to their technological implementation are summarized and discussed.
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Affiliation(s)
- René Hensel
- INM - Leibniz Institute for New Materials, 66123 Saarbrücken, Germany
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Lapierre F, Harnois M, Coffinier Y, Boukherroub R, Thomy V. Split and flow: reconfigurable capillary connection for digital microfluidic devices. LAB ON A CHIP 2014; 14:3589-3593. [PMID: 25058858 DOI: 10.1039/c4lc00650j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Supplying liquid to droplet-based microfluidic microsystems remains a delicate task facing the problems of coupling continuous to digital or macro- to microfluidic systems. Here, we take advantage of superhydrophobic microgrids to address this problem. Insertion of a capillary tube inside a microgrid aperture leads to a simple and reconfigurable droplet generation setup.
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Affiliation(s)
- Florian Lapierre
- Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR CNRS 8520, University Lille 1, F-59652 Villeneuve d'Ascq, France.
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