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Ma M, Sun R, Kang H, Wang S, Jia P, Song Y, Sun J. Direct writing concave structure on viscoelastic substrate for loading and releasing liquid on skin surface. Colloids Surf B Biointerfaces 2023; 231:113571. [PMID: 37797469 DOI: 10.1016/j.colsurfb.2023.113571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 08/21/2023] [Accepted: 09/26/2023] [Indexed: 10/07/2023]
Abstract
Droplet deposition on deformable matrix has a broad application prospect. Regular deposition and diffusion of droplet on the substrate is the key to prepare flexible concave structure. Direct writing technique is an advanced method for depositing ink droplet on various substrates, which could produce a variety of deposition forms. Meanwhile, direct writing technique has the characteristics of simplicity, convenience and strong controllability. In this work, patterned concave structure was fabricated with viscoelastic substrate by direct writing technology, depositing behavior of ink droplet, formation condition and shape control of concave structure were studied with viscoelastic substrate, and practical application of the patterned concave structure was explored in loading and releasing liquid on skin surface. This study provides an efficient method for the preparation and application of controllable concave surface.
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Affiliation(s)
- Mengdi Ma
- Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Rui Sun
- Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Haiting Kang
- Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Shuo Wang
- Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Peng Jia
- Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Yanlin Song
- Xiangfu Laboratory, Building 5, No. 828 Zhongxing Road, Xitang Town, Jiashan, Jiaxing, Zhejiang 314102, China; Key Laboratory of Green Printing, Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, China
| | - Jiazhen Sun
- Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, State Key Laboratory of Biobased Material and Green Papermaking, Faculty of Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Department of Printing and Packaging Engineering, Shanghai Publishing and Printing College, Shanghai 200093, China.
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Kim WY, Seo BW, Lee SH, Lee TG, Kwon S, Chang WS, Nam SH, Fang NX, Kim S, Cho YT. Quasi-seamless stitching for large-area micropatterned surfaces enabled by Fourier spectral analysis of moiré patterns. Nat Commun 2023; 14:2202. [PMID: 37072425 PMCID: PMC10113184 DOI: 10.1038/s41467-023-37828-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 04/03/2023] [Indexed: 04/20/2023] Open
Abstract
The main challenge in preparing a flexible mold stamp using roll-to-roll nanoimprint lithography is to simultaneously increase the imprintable area with a minimized perceptible seam. However, the current methods for stitching multiple small molds to fabricate large-area molds and functional surfaces typically rely on the alignment mark, which inevitably produces a clear alignment mark and stitched seam. In this study, we propose a mark-less alignment by the pattern itself method inspired by moiré technique, which uses the Fourier spectral analysis of moiré patterns formed by superposed identical patterns for alignment. This method is capable of fabricating scalable functional surfaces and imprint molds with quasi-seamless and alignment mark-free patterning. By harnessing the rotational invariance property in the Fourier transform, our approach is confirmed to be a simple and efficient method for extracting the rotational and translational offsets in overlapped periodic or nonperiodic patterns with a minimized stitched region, thereby allowing for the large-area and quasi-seamless fabrication of imprinting molds and functional surfaces, such as liquid-repellent film and micro-optical sheets, that surpass the conventional alignment and stitching limits and potentially expand their application in producing large-area metasurfaces.
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Affiliation(s)
- Woo Young Kim
- Department of Smart Manufacturing Engineering, Changwon National University, Changwon, South Korea
| | - Bo Wook Seo
- Department of Smart Manufacturing Engineering, Changwon National University, Changwon, South Korea
| | - Sang Hoon Lee
- Department of Smart Manufacturing Engineering, Changwon National University, Changwon, South Korea
| | - Tae Gyung Lee
- Department of Smart Manufacturing Engineering, Changwon National University, Changwon, South Korea
| | - Sin Kwon
- Department of Flexible & Printed Electronics, Korea Institute of Machinery and Materials, Daejeon, South Korea
| | - Won Seok Chang
- Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials, Daejeon, South Korea
- Department of Nanomechatronics, University of Science and Technology, Daejeon, South Korea
| | - Sang-Hoon Nam
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Nicholas X Fang
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, Hong Kong, Special Administrative Region of China
| | - Seok Kim
- Department of Smart Manufacturing Engineering, Changwon National University, Changwon, South Korea.
- Department of Mechanical Engineering, Changwon National University, Changwon, South Korea.
| | - Young Tae Cho
- Department of Smart Manufacturing Engineering, Changwon National University, Changwon, South Korea.
- Department of Mechanical Engineering, Changwon National University, Changwon, South Korea.
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Micro-replication platform for studying the structural effect of seed surfaces on wetting properties. Sci Rep 2022; 12:5607. [PMID: 35379896 PMCID: PMC8980016 DOI: 10.1038/s41598-022-09634-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 03/21/2022] [Indexed: 12/31/2022] Open
Abstract
Biological surfaces in plants are critical for controlling essential functions such as wettability, adhesion, and light management, which are linked to their adaptation, survival, and reproduction. Biomimetically patterned surfaces replicating the microstructures of plant surfaces have become an emerging tool for understanding plant–environment interactions. In this study, we developed a two-step micro-replication platform to mimic the microstructure of seed surfaces and demonstrated that this initial platform can be used to study seed surface–environment interactions. The two-step process involved the extraction of a simplified seed surface model from real seeds and micro-replication of the simplified seed surface model using nanoimprint lithography. Using Allium seeds collected from Mongolia and Central Asia as the model system, we studied the wettability of biological and synthetic seed surfaces. We could independently control the material properties of a synthetic seed surface while maintaining the microstructures and, thereby, provide clear evidence that Allium seed surfaces were highly wettable owing to the high surface energy in the epidermal material rather than a microstructural effect. We expect that this platform can facilitate study of the independent effect of microstructure on the interaction of seed surfaces with their surroundings and contribute to research on the evolution of plant–environment interactions.
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Farzeena C, Varanakkottu SN. Patterning of Metallic Nanoparticles over Solid Surfaces from Sessile Droplets by Thermoplasmonically Controlled Liquid Flow. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2003-2013. [PMID: 35119875 DOI: 10.1021/acs.langmuir.1c02739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Optically controlled assembly of suspended particles from evaporating sessile droplets is an emerging method to realize on-demand patterning of particles over solid substrates. Most of the reported strategies rely either on additives or surface texturing to modulate particle deposition. Though dynamic control over the assembly of microparticles is possible, limited success has been achieved in nanoparticle patterning, especially in the case of metallic nanoparticles. This work demonstrates a simple light-directed patterning of gold (Au) nanoparticles based on the thermoplasmonically controlled liquid flow. Excitation at the plasmonic wavelength (532 nm) generates the required temperature gradient, resulting in the particle assembly at the irradiation zone in response to the thermocapillary flow created inside the droplet. Particle streak velocimetry experiments and analysis confirm the existence of a strong thermocapillary flow, which counteracts the naturally occurring evaporative convection flows. By modulating the illumination conditions, we could achieve patterns with various morphologies, including center deposit, off-center deposit, multi-spot deposit, and lines. We successfully applied the developed strategy for realizing closely packed hybrid particle assembly containing different particles: Au and polystyrene particles (PS). We performed optical microscopy, 3D profilometry, and SEM analysis to characterize the particle deposit. We analyzed the periodicity of Au-PS hybrid assembly using fast Fourier transform and radial distribution function analysis. PS particles formed a hexagonal close-packed arrangement at the irradiation zone, with Au NPs residing inside the voids. We believe that the presented strategy could significantly enhance the applicability of the evaporative lithography from sessile droplets for the programmable patterning of metallic nanoparticles.
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Affiliation(s)
- Chalikkara Farzeena
- School of Materials Science and Engineering, National Institute of Technology Calicut, Kozhikode 673601 Kerala, India
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