1
|
Lee J, Park S, Shin B, Kim YJ, Lee S, Kim J, Jang KJ, Choo OS, Kim J, Seonwoo H, Chung JH, Choung YH. Latent Stem Cell-Stimulating Radially Aligned Electrospun Nanofibrous Patches for Chronic Tympanic Membrane Perforation Therapy. Acta Biomater 2024:S1742-7061(24)00537-3. [PMID: 39303832 DOI: 10.1016/j.actbio.2024.09.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 09/12/2024] [Accepted: 09/12/2024] [Indexed: 09/22/2024]
Abstract
Chronic tympanic membrane (TM) perforation is a tubotympanic disease caused by either traumatic injury or inflammation. A recent study demonstrated significant progress in promoting the regeneration of chronic TM perforations through the application of nanofibers with radially aligned nanostructures and controlled release of growth factors. However, radially aligned nanostructures with stem cell-stimulating factors have never been used. In this study, insulin-like growth factor binding factor 2 (IGFBP2)-incorporated radially aligned nanofibrous patches (IRA-NFPs) were developed and applied to regenerate chronic TM perforations. The IRA-NFPs were prepared by electrospinning 8 wt% polycaprolactone in trifluoroethanol and acetic acid (9:1). Random nanofibers (RFs) and aligned nanofibers (AFs) were successfully fabricated using a flat plate and a custom-designed circular collector, respectively. The presence of IGFBP2 was confirmed via Fourier transform infrared spectroscopy, and the release of IGFBP2 was sustained for up to 20 days. In vitro studies revealed enhanced cellular proliferation and migration on AFs compared to RFs, with IGFBP2 incorporation further promoting these effects. Quantitative real-time PCR revealed mRNA downregulation, correlating with accelerated migration and increased cell confluency. In vivo studies using Choung's COM model 1 showed IGFBP2-loaded RF and AF patches increased regeneration success rates by 1.59-fold and 2.23-fold, respectively, while also reducing healing time by 2.5-fold compared to controls. Furthermore, IGFBP2-incorporated AFs demonstrated superior efficacy in healing larger perforations with enhanced histological similarity to native TMs. This study, combining stem cell stimulating factors and aligned nanostructures, proposes a novel approach potentially replacing conventional surgical methods for chronic TM perforation regeneration. STATEMENT OF SIGNIFICANCE: Chronic otitis media (COM) affects approximately 200 million people worldwide due to inflammation, inadequate blood supply, and lack of growth factors. Current surgical treatments have limitations like high costs and anesthetic risks. Recent research explored the use of nanofibers with radially aligned nanostructures and controlled release of growth factors to treat chronic tympanic membrane (TM) perforations. In this study, insulin-like growth factor binding protein 2 (IGFBP2)-incorporated radially aligned nanofibrous patches (IRA-NFPs) were developed and applied to regenerate chronic TM perforations. We assessed their properties and efficacy through in vitro and in vivo studies. IRA-NFPs showed promising healing capabilities with chronic TM perforation models. This innovative approach has the potential to improve COM management, reduce surgery costs, and enhance patient safety.
Collapse
Affiliation(s)
- Juo Lee
- Department of Animal Science & Technology, Sunchon National University, Suncheon, 57922, Republic of Korea; Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon, 57922, Republic of Korea
| | - Sangbae Park
- Department of Biosystems Engineering, Seoul National University, Seoul 08826, Republic of Korea; Integrated Major in Global Smart Farm, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea; Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Beomyong Shin
- Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, 16499, Republic of Korea
| | - Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, 16499, Republic of Korea; Department of Neurology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Sungmin Lee
- Department of Human Harmonized Robotics, College of Engineering, Sunchon National University, Suncheon 57922, Republic of Korea
| | - Jungsil Kim
- Department of Smart Bio-Industrial Mechanical Engineering, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Kyoung-Je Jang
- Department of Bio-Systems Engineering, Institute of Smart Farm, Gyeongsang National University, Jinju, 52828, Republic of Korea; Institute of Agriculture & Life Science, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, 16499, Republic of Korea
| | - Jangho Kim
- Department of Convergence Biosystems Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea; Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea; Interdisciplinary Program in IT-Bio Convergence System, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Hoon Seonwoo
- Interdisciplinary Program in IT-Bio Convergence System, Sunchon National University, Suncheon, 57922, Republic of Korea; Department of Convergent Biosystems Engineering, College of Life Science and Natural Resources, Sunchon National University, Suncheon, 57922, Republic of Korea.
| | - Jong Hoon Chung
- Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea; ELBIO Inc, Seoul 08812, Republic of Korea.
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, 16499, Republic of Korea.
| |
Collapse
|
2
|
Ganbaatar SE, Kim YM, Kim HK, Cho YS, Park HH. Evaluation of antibacterial activity on nanoline-array surfaces with different spacing. Colloids Surf B Biointerfaces 2024; 245:114242. [PMID: 39288549 DOI: 10.1016/j.colsurfb.2024.114242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2024] [Revised: 09/11/2024] [Accepted: 09/11/2024] [Indexed: 09/19/2024]
Abstract
Extensive research has been conducted on anti-biofouling or antibacterial surfaces, with nanostructured surfaces that mimic cicada and dragonfly wings emerging as promising candidates for mechano-bactericidal applications. These biomimetic nanostructured surfaces are capable of exerting a bactericidal effect by directly damaging the membranes of bacteria attached to nanostructures. Although research on bactericidal effect using various nanostructures have been conducted, no specific studies have yet reported on the antibacterial efficiency of the surface having nanoline array, especially regarding the spacing between nanolines. This study details the fabrication of nanoline array via ultraviolet (UV) molding with polyurethane acrylate (PUA), noted for its UV sensitivity and rapid curing, enabling the fabrication of precise and scalable nanoscale structures. Investigation into the nanoline array's antibacterial effects against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) reveals that nanoline spacing critically influences bacterial adherence and viability, with specific spacings enhancing antibacterial properties. Scanning electron microscopy (SEM) and confocal microscopy analyses show that surface topography significantly affects bacterial behavior, with specific spacings leading to varied bacterial responses, including membrane damage and altered attachment patterns. The study highlights the potential of nanoline array in fabricating surfaces with tailored antibacterial properties, emphasizing the importance of nanoscale design in influencing bacterial interaction and viability. We also confirm the relative mechanical rigidity of the nanoline array, which exhibits antibacterial effects, through both experimental observations and numerical analysis. This indicates our proposed nanoline-array surface could have potential future applications in mechanical anti-bacterial functions that require such structural robustness.
Collapse
Affiliation(s)
- Suvd Erdene Ganbaatar
- Department of Mechanical Engineering, College of Engineering, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Republic of Korea
| | - You Min Kim
- Department of Mechanical Engineering, College of Engineering, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Republic of Korea
| | - Hee-Kyeong Kim
- Department of Mechanical Engineering, College of Engineering, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Republic of Korea
| | - Young-Sam Cho
- Division of Mechanical Engineering, College of Engineering, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Republic of Korea; MECHABIO Group, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Republic of Korea.
| | - Hyun-Ha Park
- Division of Mechanical Engineering, College of Engineering, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Republic of Korea; MECHABIO Group, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Republic of Korea.
| |
Collapse
|
3
|
Isik T, Freund M, Linthicum W, Huey BD, Ortalan V. Laser patterning captured in real-time: surface modifications of multilayer thin-films under nanosecond laser heating. NANOSCALE 2024; 16:16535-16542. [PMID: 39145438 DOI: 10.1039/d4nr01378f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
Controlled wrinkle formation has attracted intensive research interest as a means to modify surface properties. However, most of the currently explored methods rely on mechanically stretching polymer substrates with hard surface coatings, and the application of these methods to different materials is limited. Here, for the first time, we demonstrate laser-assisted periodic wrinkle formation on silicon nitride (SiN) membranes that are coated with titanium (Ti)/nickel (Ni) multilayers. Corrugated surface formation mechanism, as well as grain nucleation and growth, are studied using ultrafast transmission electron microscopy (UTEM). Periodic wrinkling and patterning of multilayers on thin SiN membranes are induced by a nanosecond pulsed laser, and the deformation of the film is captured by single-shot imaging. The investigated structures revealed periodic wrinkling of the membrane and corrugated surface formation on both sides of the film. The findings of this work could allow laser-irradiation-based fast fabrication of corrugated films with tailored properties.
Collapse
Affiliation(s)
- Tugba Isik
- School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
| | - Mason Freund
- Department of Materials Science & Engineering, University of Connecticut, Storrs, Connecticut 06269, USA.
| | - Will Linthicum
- Department of Materials Science & Engineering, University of Connecticut, Storrs, Connecticut 06269, USA.
| | - Bryan D Huey
- Department of Materials Science & Engineering, University of Connecticut, Storrs, Connecticut 06269, USA.
| | - Volkan Ortalan
- Department of Materials Science & Engineering, University of Connecticut, Storrs, Connecticut 06269, USA.
| |
Collapse
|
4
|
Oguntade E, Wigham C, Owuor L, Aryal U, O'Grady K, Acierto A, Zha RH, Henderson JH. Dry and wet wrinkling of a silk fibroin biopolymer by a shape-memory material with insight into mechanical effects on secondary structures in the silk network. J Mater Chem B 2024; 12:6351-6370. [PMID: 38864220 DOI: 10.1039/d4tb00112e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Surface wrinkling provides an approach to modify the surfaces of biomedical devices to better mimic features of the extracellular matrix and guide cell attachment, proliferation, and differentiation. Biopolymer wrinkling on active materials holds promise but is poorly explored. Here we report a mechanically actuated assembly process to generate uniaxial micro-and nanosized silk fibroin (SF) wrinkles on a thermo-responsive shape-memory polymer (SMP) substrate, with wrinkling demonstrated under both dry and hydrated (cell compatible) conditions. By systematically investigating the influence of SMP programmed strain magnitude, film thickness, and aqueous media on wrinkle stability and morphology, we reveal how to control the wrinkle sizes on the micron and sub-micron length scale. Furthermore, as a parameter fundamental to SMPs, we demonstrate that the temperature during the recovery process can also affect the wrinkle characteristics and the secondary structures in the silk network. We find that with increasing SMP programmed strain magnitude, silk wrinkled topographies with increasing wavelengths and amplitudes are achieved. Furthermore, silk wrinkling is found to increase β-sheet content, with spectroscopic analysis suggesting that the effect may be due primarily to tensile (e.g., Poisson effect and high-curvature wrinkle) loading modes in the SF, despite the compressive bulk deformation (uniaxial contraction) used to produce wrinkles. Silk wrinkles fabricated from sufficiently thick films (roughly 250 nm) persist after 24 h in cell culture medium. Using a fibroblast cell line, analysis of cellular response to the wrinkled topographies reveals high viability and attachment. These findings demonstrate use of wrinkled SF films under physiologically relevant conditions and suggest the potential for biopolymer wrinkles on biomaterials surfaces to find application in cell mechanobiology, wound healing, and tissue engineering.
Collapse
Affiliation(s)
- Elizabeth Oguntade
- Department of Biomedical & Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.
- BioInspired Syracuse: Institute for Material and Living Systems, Syracuse University, Syracuse, NY 13244, USA
| | - Caleb Wigham
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Luiza Owuor
- Department of Biomedical & Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.
- BioInspired Syracuse: Institute for Material and Living Systems, Syracuse University, Syracuse, NY 13244, USA
| | - Ujjwal Aryal
- Department of Biomedical & Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.
- BioInspired Syracuse: Institute for Material and Living Systems, Syracuse University, Syracuse, NY 13244, USA
| | - Kerrin O'Grady
- Department of Biomedical & Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.
- BioInspired Syracuse: Institute for Material and Living Systems, Syracuse University, Syracuse, NY 13244, USA
| | - Anthony Acierto
- Department of Biomedical & Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.
- BioInspired Syracuse: Institute for Material and Living Systems, Syracuse University, Syracuse, NY 13244, USA
| | - R Helen Zha
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - James H Henderson
- Department of Biomedical & Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA.
- BioInspired Syracuse: Institute for Material and Living Systems, Syracuse University, Syracuse, NY 13244, USA
| |
Collapse
|
5
|
Sartori P, Ferraro D, Pierno M, Mistura G. Resonance Modes of Water Drops Pinned to a Vibrating Rectangular Post. MICROMACHINES 2024; 15:634. [PMID: 38793206 PMCID: PMC11122966 DOI: 10.3390/mi15050634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 04/30/2024] [Accepted: 05/07/2024] [Indexed: 05/26/2024]
Abstract
We studied the effects of vertical vibrations on a water drop that was pinned to the sharp edges of a rectangular post. By varying the frequency and amplitude of the vertical displacement, distinct resonance peaks were observed using a simple optical technique. The vibrational spectra of the first two modes exhibited two closely spaced peaks, which corresponded to standing waves that exist along the major and minor contour lengths of the drops. The values of the resonance frequencies can be explained rather well by a simple model, which was originally proposed for axially symmetric drops.
Collapse
Affiliation(s)
| | | | | | - Giampaolo Mistura
- Department of Physics and Astronomy, University of Padua, Via Marzolo 8, 35131 Padua, Italy; (P.S.); (D.F.); (M.P.)
| |
Collapse
|
6
|
Wang Q, Yu S, Ye Q, Yang B, Zhang Y, Wang X, Li L. Controlled Preparation of Highly Stretchable, Crack-Free Wrinkled Surfaces with Tunable Wetting and Optical Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:2102-2110. [PMID: 38227966 DOI: 10.1021/acs.langmuir.3c02920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Constructing wrinkles by utilizing strain-driven surface instability in film-substrate systems is a general method to prepare micronano structures, which have a wide range of applications in smart surfaces and devices such as flexible electronics, reversible wetting, friction, and optics. However, cracks generated during the preparation and use process significantly affect the uniformity of wrinkled surfaces and degrade the functional properties of the film devices. The realization of crack-free wrinkles with high stretchability in hard film systems is still a great challenge. Here, we report on a facile technique for controllable preparation of large-area, highly stretchable, crack-free wrinkled surfaces by ultraviolet ozone (UVO) treatment of Ecoflex. The thickness dependence of the wrinkles and the in situ wrinkling process during mechanical loading are investigated. The wrinkles including striped, labyrinth-like, herringbone, and transitional structures are controllable by changing strain mode (uniaxial or biaxial), loading history (simultaneous or sequential), strain anisotropy, and gradient loading. The wrinkled surfaces obtained using UVO-treated Ecoflex have tunable wetting and optical properties and can maintain excellent mechanical stability under large strains. This study provides a facile method for the preparation of large-area, crack-free wrinkles, which is simple, fast, low-cost, and robust. The resulting wrinkled surfaces remain stable under high stretching, which is beneficial for many practical applications, especially in the cases of large strains.
Collapse
Affiliation(s)
- Qiaofan Wang
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
| | - Senjiang Yu
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
| | - Qianqian Ye
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
| | - Bo Yang
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
| | - Yongju Zhang
- College of Mechanical Engineering, Taizhou University, Jiaojiang 318000, P. R. China
| | - Xin Wang
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
| | - Lingwei Li
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
| |
Collapse
|
7
|
Wang X, Yan X, Du J, Chen F, Yu F, Tao R, Wang S, Min Q. Dynamic wetting of Newtonian and viscoelastic fluids on microstructured surfaces. J Colloid Interface Sci 2023; 652:2098-2107. [PMID: 37699328 DOI: 10.1016/j.jcis.2023.09.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/17/2023] [Accepted: 09/05/2023] [Indexed: 09/14/2023]
Abstract
Hypothesis Although extensive research has been conducted on the dynamic wetting of Newtonian fluids, limited insights have been gained for viscoelastic fluids, particularly on engineered surfaces. We hypothesize that differences in dynamic wetting on microstructured surfaces exist between such fluids, which may be attributed to variations in viscosity and elasticity as well as changes in the microscopic morphology of the moving contact line. Experiments To systematically investigate the wetting differences between Newtonian and viscoelastic fluids on microstructured surfaces, we conducted forced wetting experiments of glycerol-water and carboxymethyl cellulose aqueous solutions on microstructured polytetrafluoroethylene surfaces through a modified Wilhelmy plate method. Findings Results demonstrated an apparent difference in the relationship between the dynamic contact angle and moving velocity with different microstructured surfaces for Newtonian and viscoelastic fluids. The power-law exponent between the capillary number and cubic of the dynamic contact angle increases with the strengthening of shear thinning and elastic effects. In contrast, this exponent is rarely influenced by the scale of microstructured surfaces, particularly in highly viscous regions where viscous force dominates. In addition, viscosity affects the viscous bending and distance that liquid molecules jump at the contact line. These findings have potential applications in coating complex fluids on engineered surfaces.
Collapse
Affiliation(s)
- Xiong Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 99907, China; Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Beijing 100084, China
| | - Xiao Yan
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (SAR) 999077, China.
| | - Jiayu Du
- Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Beijing 100084, China
| | - Feipeng Chen
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong (SAR) 999077, China
| | - Fanfei Yu
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 99907, China
| | - Ran Tao
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 99907, China
| | - Steven Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 99907, China.
| | - Qi Min
- Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Beijing 100084, China.
| |
Collapse
|
8
|
Cho C, Kim D, Lee C, Oh JH. Ultrasensitive Ionic Liquid Polymer Composites with a Convex and Wrinkled Microstructure and Their Application as Wearable Pressure Sensors. ACS APPLIED MATERIALS & INTERFACES 2023; 15:13625-13636. [PMID: 36861378 DOI: 10.1021/acsami.2c22825] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The development of pressure sensors with high sensitivity and effectiveness that exhibit linearity over a wide pressure range is crucial for wearable devices. In this study, we fabricated a novel ionic liquid (IL)/polymer composite with a convex and randomly wrinkled microstructure in a cost-effective and facile manner using an opaque glass and stretched polydimethylsiloxane template. The fabricated IL/polymer composite was used as the dielectric layer in a capacitive pressure sensor. The sensor exhibited a high linear sensitivity of 56.91 kPa-1 owing to the high interfacial capacitance formed by the electrical double layer of the IL/polymer composite over a relatively wide range (0-80 kPa). We also demonstrated the sensor performance for various applications such as a glove-attached sensor, sensor array, respiration monitoring mask, human pulse, blood pressure measurement, human motion detection, and a wide range of pressure sensing. It would be expected that the proposed pressure sensor has sufficient potential for use in wearable devices.
Collapse
Affiliation(s)
- Changwoo Cho
- Department of Mechanical Engineering and BK21 FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdeahak-ro, Sangrok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
| | - Dongwon Kim
- Department of Mechanical Engineering and BK21 FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdeahak-ro, Sangrok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
| | - Chaeeun Lee
- Department of Mechanical Engineering and BK21 FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdeahak-ro, Sangrok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
| | - Je Hoon Oh
- Department of Mechanical Engineering and BK21 FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdeahak-ro, Sangrok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
| |
Collapse
|
9
|
Sarabia-Vallejos MA, Cerda-Iglesias FE, Pérez-Monje DA, Acuña-Ruiz NF, Terraza-Inostroza CA, Rodríguez-Hernández J, González-Henríquez CM. Smart Polymer Surfaces with Complex Wrinkled Patterns: Reversible, Non-Planar, Gradient, and Hierarchical Structures. Polymers (Basel) 2023; 15:polym15030612. [PMID: 36771913 PMCID: PMC9920088 DOI: 10.3390/polym15030612] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/11/2023] [Accepted: 01/19/2023] [Indexed: 01/26/2023] Open
Abstract
This review summarizes the relevant developments in preparing wrinkled structures with variable characteristics. These include the formation of smart interfaces with reversible wrinkle formation, the construction of wrinkles in non-planar supports, or, more interestingly, the development of complex hierarchically structured wrinkled patterns. Smart wrinkled surfaces obtained using light-responsive, pH-responsive, temperature-responsive, and electromagnetic-responsive polymers are thoroughly described. These systems control the formation of wrinkles in particular surface positions and the reversible construction of planar-wrinkled surfaces. This know-how of non-planar substrates has been recently extended to other structures, thus forming wrinkled patterns on solid, hollow spheres, cylinders, and cylindrical tubes. Finally, this bibliographic analysis also presents some illustrative examples of the potential of wrinkle formation to create more complex patterns, including gradient structures and hierarchically multiscale-ordered wrinkles. The orientation and the wrinkle characteristics (amplitude and period) can also be modulated according to the requested application.
Collapse
Affiliation(s)
- Mauricio A. Sarabia-Vallejos
- Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Sede Santiago, Santiago 8420524, Chile
| | - Felipe E. Cerda-Iglesias
- Departamento de Química, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Universidad Tecnológica Metropolitana, Santiago 7800003, Chile
- Programa PhD en Ciencia de Materiales e Ingeniería de Procesos, Universidad Tecnológica Metropolitana, Santiago 8940000, Chile
| | - Dan A. Pérez-Monje
- Departamento de Química, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Universidad Tecnológica Metropolitana, Santiago 7800003, Chile
| | - Nicolas F. Acuña-Ruiz
- Departamento de Química, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Universidad Tecnológica Metropolitana, Santiago 7800003, Chile
| | - Claudio A. Terraza-Inostroza
- Research Laboratory for Organic Polymer (RLOP), Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Santiago 7810000, Chile
| | - Juan Rodríguez-Hernández
- Polymer Functionalization Group, Departamento de Química Macromolecular Aplicada, Instituto de Ciencia y Tecnología de Polímeros-Consejo Superior de Investigaciones Científicas (ICTP-CSIC), 28006 Madrid, Spain
| | - Carmen M. González-Henríquez
- Departamento de Química, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Universidad Tecnológica Metropolitana, Santiago 7800003, Chile
- Programa Institucional de Fomento a la Investigación, Desarrollo e Innovación, Universidad Tecnológica Metropolitana, Santiago 8940000, Chile
- Correspondence:
| |
Collapse
|
10
|
Loh JYY, Zeineddine A, Shayegannia M, McNeil R, McRae L, Kherani NP. A one-step, tunable method of selective reactive sputter deposition as a wrinkling approach for silver/polydimethylsiloxane for electrically conductive pliable surfaces. MICROSYSTEMS & NANOENGINEERING 2022; 8:89. [PMID: 35957954 PMCID: PMC9360048 DOI: 10.1038/s41378-022-00420-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 05/25/2022] [Accepted: 06/08/2022] [Indexed: 05/31/2023]
Abstract
The wrinkle period and morphology of a metal thin film on an elastic substrate is typically controlled by modifying the substrate before carrying out additional metal deposition steps. Herein, we show that a simultaneously selective and reactive sputtering plasma that modifies the surface of a polydimethylsiloxane (PDMS) substrate while not reacting with the metal during the deposition process decreases the wrinkle wavelength and induces additional wrinkling components and features such as ripples or folds. The selective reaction of the nitrogen plasma with PDMS functionalizes the siloxane surface into silicon oxynitride. This hardens the immediate surface of PDMS, with a quadratic increase in the Young's modulus as a function of the sputtering flow ratio. The increase in the critical strain mismatch and the corresponding presence of folds in the nitrogen-modified wrinkled silver film form a suitable plasmonic platform for surface-enhanced Raman spectroscopy (SERS), yielding an enhancement factor of 4.8 × 105 for detecting lipids. This enhancement is linked to the emergence of electromagnetic hotspots from surface plasmon polariton coupling between the folds/wrinkles, which in turn enables the detection of low concentrations of organics using SERS. Furthermore, when strained, the nitrogen-modified wrinkles enhance electrical conductivity by a factor of 12 compared with unmodified films. Finally, the optical properties of the substrate can be tuned by altering the N2 content. The simple addition of nonreactive nitrogen to silver sputtering enables simultaneous PDMS hardening and growth of the silver film and together provide a new avenue for tuning wrinkling parameters and enhancing the electrical conductivity of pliable surfaces.
Collapse
Affiliation(s)
- Joel Y. Y. Loh
- Department of Electrical and Computing Engineering, University of Toronto, Toronto, ON M5S 3G4 Canada
| | - Ali Zeineddine
- Department of Electrical and Computing Engineering, University of Toronto, Toronto, ON M5S 3G4 Canada
| | - Moein Shayegannia
- Department of Electrical and Computing Engineering, University of Toronto, Toronto, ON M5S 3G4 Canada
| | - Robyn McNeil
- Department of Material Science and Engineering, University of Toronto, Toronto, ON M5S 3E4 Canada
| | - Liam McRae
- Department of Electrical and Computing Engineering, University of Toronto, Toronto, ON M5S 3G4 Canada
| | - Nazir P. Kherani
- Department of Electrical and Computing Engineering, University of Toronto, Toronto, ON M5S 3G4 Canada
- Department of Material Science and Engineering, University of Toronto, Toronto, ON M5S 3E4 Canada
| |
Collapse
|
11
|
Liu A, Yao Y, Yao J, Liu T. Droplet Spreading Induced Wrinkling and Its Use for Measuring the Elastic Modulus of Polymeric Thin Films. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Aishuang Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Soochow 215123, P. R. China
| | - Yanbo Yao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Soochow 215123, P. R. China
| | - Jingwen Yao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Soochow 215123, P. R. China
| | - Tao Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Soochow 215123, P. R. China
| |
Collapse
|
12
|
Abstract
Here we report a simple micro/nano patterning strategy based on light-induced surface wrinkling. Namely, we fabricated a film/substrate system composed of polydimethylsiloxane (PDMS) as a soft substrate and non-photosensitive polymer polystyrene (PS) mixed with azo-polymer (polydisperse orange 3, PDO3) as a stiff film. Taking advantage of the photo-thermal effect and photo-softening effect of PDO3, we fabricated various microstructured wrinkling morphologies by a simple light illumination. We investigated the influence of two exposure modes (i.e., static selective exposure and dynamic moving exposure), the illumination conditions, the composition of the blended film, and the film thickness on the resulting wrinkling patterns. It is highly expected that this azo-based photosensitive wrinkling system will be extended to functional systems for the realization of light-induced surface micro/nanopatterning.
Collapse
|
13
|
Wawryk MM, Turpin GA, Tabor RF. Surface defects on wrinkled PDMS induce droplet anisotropy. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128317] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
14
|
Ding Y, Jia L, Yin L, Dang C, Liu X, Xu J. Anisotropic wetting characteristics of droplet on micro-grooved surface. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127850] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
15
|
Liu Y, Feng Z, Xu C, Chatterjee A, Gorodetsky AA. Reconfigurable Micro- and Nano-Structured Camouflage Surfaces Inspired by Cephalopods. ACS NANO 2021; 15:17299-17309. [PMID: 34633175 DOI: 10.1021/acsnano.0c09990] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Wrinkled surfaces and materials are found throughout the natural world in various plants and animals and are known to improve the performance of emerging optical and electrical technologies. Despite much progress, the reversible post-fabrication tuning of wrinkle sizes and geometries across multiple length scales has remained relatively challenging for some materials, and the development of comprehensive structure-function relationships for optically active wrinkled surfaces has often proven difficult. Herein, by drawing inspiration from natural cephalopod skin and leveraging methodologies established for artificial adaptive infrared platforms, we engineer systems with hierarchically reconfigurable wrinkled surface morphologies and dynamically tunable visible-to-infrared spectroscopic properties. Specifically, we demonstrate architectures for which mechanical actuation changes the surface morphological characteristics; modulates the reflectance, transmittance, and absorptance across a broad spectral window; controls the specular-to-diffuse reflectance ratios; and alters the visible and thermal appearances. Moreover, we demonstrate the incorporation of these architectures into analogous electrically actuated appearance-changing devices that feature competitive figures of merit, such as reasonable maximum areal strains, rapid response times, and good stabilities upon repeated actuation. Overall, our findings constitute another step forward in the continued development of cephalopod-inspired light- and heat-manipulating systems and may facilitate advanced applications in the areas of sensing, electronics, optics, soft robotics, and thermal management.
Collapse
Affiliation(s)
- Yinuan Liu
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Zhijing Feng
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, California 92697, United States
| | - Chengyi Xu
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697, United States
| | - Atrouli Chatterjee
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, California 92697, United States
| | - Alon A Gorodetsky
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, California 92697, United States
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697, United States
| |
Collapse
|
16
|
Mechanically Switchable Wetting Petal Effect in Self-Patterned Nanocolumnar Films on Poly(dimethylsiloxane). NANOMATERIALS 2021; 11:nano11102566. [PMID: 34685004 PMCID: PMC8538580 DOI: 10.3390/nano11102566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/21/2021] [Accepted: 09/23/2021] [Indexed: 12/28/2022]
Abstract
Switchable mechanically induced changes in the wetting behavior of surfaces are of paramount importance for advanced microfluidic, self-cleaning and biomedical applications. In this work we show that the well-known polydimethylsiloxane (PDMS) elastomer develops self-patterning when it is coated with nanostructured TiO2 films prepared by physical vapor deposition at glancing angles and subsequently subjected to a mechanical deformation. Thus, unlike the disordered wrinkled surfaces typically created by deformation of the bare elastomer, well-ordered and aligned micro-scaled grooves form on TiO2/PDMS after the first post-deposition bending or stretching event. These regularly patterned surfaces can be reversibly modified by mechanical deformation, thereby inducing a switchable and reversible wetting petal effect and the sliding of liquid droplets. When performed in a dynamic way, this mechanical actuation produces a unique capacity of liquid droplets (water and diiodomethane) transport and tweezing, this latter through their selective capture and release depending on their volume and chemical characteristics. Scanning electron and atomic force microscopy studies of the strained samples showed that a dual-scale roughness, a parallel alignment of patterned grooves and their reversible widening upon deformation, are critical factors controlling this singular sliding behavior and the possibility to tailor their response by the appropriate manufacturing of surface structures.
Collapse
|
17
|
|
18
|
Dynamic contact line lithography: Template-less complex Meso-patterning with polystyrene and poly(methyl methacrylate). J Colloid Interface Sci 2021; 601:156-166. [PMID: 34062394 DOI: 10.1016/j.jcis.2021.05.100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/17/2021] [Accepted: 05/18/2021] [Indexed: 11/21/2022]
Abstract
HYPOTHESIS Micro/nanopatterning on a 2D surface is apt for cutting-edge miniaturization technology, which directly or indirectly requires high-end expensive lithographic tools. The evaporative deposition at the receding contact-line of a polymer solution, termed as Dynamic Contact Line Lithography (DCLL), can be a potential inexpensive technique for template-less meso-patterning if the deposition patterns from DCLL can be predicted a priori. EXPERIMENTS A deposition map (morphological phase diagram) from the myriads of patterns is constructed in terms of contact-line velocity and the polymer concentration. Specifically, two combinations: polystyrene (PS)/cyclohexane and poly (methyl methacrylate) (PMMA)/toluene are used to show the generic nature of the phase diagrams. The surface wettability of Si (water contact angle, CA ~15°) is tuned from CA ~35° to ~98° by patterning with DCLL. FINDINGS Directed by the phase diagrams, fabrication of a complex rectangular cross-pattern of PS and PMMA micro-threads with a periodicity of ~65 μm and ~50 μm respectively on a Si surface is demonstrated to establish the robustness and potential of the DCLL and predictive phase diagram.
Collapse
|
19
|
Mazaltarim AJ, Bowen JJ, Taylor JM, Morin SA. Dynamic manipulation of droplets using mechanically tunable microtextured chemical gradients. Nat Commun 2021; 12:3114. [PMID: 34035293 PMCID: PMC8149645 DOI: 10.1038/s41467-021-23383-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 04/21/2021] [Indexed: 11/09/2022] Open
Abstract
Materials and strategies applicable to the dynamic transport of microdroplets are relevant to surface fluidics, self-cleaning materials, thermal management systems, and analytical devices. Techniques based on electrowetting, topographic micropatterns, and thermal/chemical gradients have advanced considerably, but dynamic microdroplet transport remains a challenge. This manuscript reports the fabrication of mechano-tunable, microtextured chemical gradients on elastomer films and their use in controlled microdroplet transport. Specifically, discreet mechanical deformations of these films enabled dynamic tuning of the microtextures and thus transport along surface-chemical gradients. The interplay between the driving force of the chemical gradient and the microtopography was characterized, facilitating accurate prediction of the conditions (droplet radius and roughness) which supported transport. In this work, the use of microtextured surface chemical gradients in mechano-adaptive materials with microdroplet manipulation functionality was highlighted.
Collapse
Affiliation(s)
- Ali J Mazaltarim
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, NE, USA
| | - John J Bowen
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, NE, USA
| | - Jay M Taylor
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, NE, USA
| | - Stephen A Morin
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, NE, USA. .,Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Lincoln, NE, USA. .,Nebraska Center for Integrated Biomolecular Communication, University of Nebraska - Lincoln, Lincoln, NE, USA.
| |
Collapse
|
20
|
Li W, Liu Y, Leng J. Harnessing Wrinkling Patterns Using Shape Memory Polymer Microparticles. ACS APPLIED MATERIALS & INTERFACES 2021; 13:23074-23080. [PMID: 33949849 DOI: 10.1021/acsami.1c00623] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Shape memory polymers (SMPs) are the simplest and most attractive alternatives for soft substrates of typical bilayer wrinkle systems because of shape fixity and recovery capabilities. Herein, we have successfully programmed large compressive strains in chemical cross-linking shape memory polystyrene (PS) microparticles via nanoimprint lithography, which acted as the substrate of a wrinkle system using a gold nanoparticle (Au NP) film as the top layer. When triggered by two different stimuli (direct heating and toluene vapors), the thin Au NP film could transform into various wrinkle structures atop the recovered PS particles. In addition, we also investigated the evolution mechanisms of wrinkling by heating and toluene vapors and tuned the wrinkled surfaces through altering the Au NP thickness and stimulation methods (direct heating and toluene vapors), which utilized the structural adjustability of Au NPs to program the amplitude, wavelength, and morphology of the wrinkles. The concept presented here provides a cost-effective approach to realize the surface wrinkling and can be extended to other available SMPs.
Collapse
Affiliation(s)
- Wenbing Li
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 YiKuang Street, P.O. Box 3011, Harbin 150080, PR China
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, PR China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin 150001, PR China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 YiKuang Street, P.O. Box 3011, Harbin 150080, PR China
| |
Collapse
|
21
|
Bu Y, Ni S, Yobas L. Ordered surface crack patterns in situ formed under confinement on fluidic microchannel boundaries in polydimethylsiloxane. LAB ON A CHIP 2021; 21:668-673. [PMID: 33514991 DOI: 10.1039/d0lc01131b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We present ordered surface crack patterns discovered in microfluidic channels/chambers in polydimethylsiloxane (PDMS). The cracks are formed in situ under confinement due to compression applied following an oxygen plasma step in a soft lithography process. The crack patterns are noticeable only after fluorescent labeling and vary with fluidic layout as well as material compliance.
Collapse
Affiliation(s)
- Yang Bu
- Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.
| | - Sheng Ni
- Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.
| | - Levent Yobas
- Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China. and Division of Biomedical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| |
Collapse
|
22
|
Soft imprint lithography for liquid crystal alignment using a wrinkled UVO-treated PDMS transferring method. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
23
|
Ding W, Han D, Zhang J, Ma Q, Li X, Zhang J, Wang X. Molecular dynamics study of anisotropic behaviours of water droplet on textured surfaces with various energies. Mol Phys 2021. [DOI: 10.1080/00268976.2020.1785028] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Wenyang Ding
- Institute of Thermal Science and Technology, Shandong University, Jinan, People’s Republic of China
| | - Dan Han
- Institute of Thermal Science and Technology, Shandong University, Jinan, People’s Republic of China
| | - Jingzhi Zhang
- School of Energy and Power Engineering, Shandong University, Jinan, People’s Republic of China
| | - Qingming Ma
- Department of Pharmaceutics, School of Pharmacy, Qingdao University, Qingdao, People’s Republic of China
| | - Xiaoyan Li
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, People’s Republic of China
| | - Jingchao Zhang
- Holland Computing Center, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Xinyu Wang
- Institute of Thermal Science and Technology, Shandong University, Jinan, People’s Republic of China
| |
Collapse
|
24
|
Parihar V, Chakraborty S, Das S, Chakraborty S, DasGupta S. Role of anisotropic pinning and liquid properties during partial rebound of droplets on unidirectionally structured hydrophobic surfaces. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116197] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
25
|
Emanuel MD, Cherstvy AG, Metzler R, Gompper G. Buckling transitions and soft-phase invasion of two-component icosahedral shells. Phys Rev E 2021; 102:062104. [PMID: 33465945 DOI: 10.1103/physreve.102.062104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 11/11/2020] [Indexed: 12/18/2022]
Abstract
What is the optimal distribution of two types of crystalline phases on the surface of icosahedral shells, such as of many viral capsids? We here investigate the distribution of a thin layer of soft material on a crystalline convex icosahedral shell. We demonstrate how the shapes of spherical viruses can be understood from the perspective of elasticity theory of thin two-component shells. We develop a theory of shape transformations of an icosahedral shell upon addition of a softer, but still crystalline, material onto its surface. We show how the soft component "invades" the regions with the highest elastic energy and stress imposed by the 12 topological defects on the surface. We explore the phase diagram as a function of the surface fraction of the soft material, the shell size, and the incommensurability of the elastic moduli of the rigid and soft phases. We find that, as expected, progressive filling of the rigid shell by the soft phase starts from the most deformed regions of the icosahedron. With a progressively increasing soft-phase coverage, the spherical segments of domes are filled first (12 vertices of the shell), then the cylindrical segments connecting the domes (30 edges) are invaded, and, ultimately, the 20 flat faces of the icosahedral shell tend to be occupied by the soft material. We present a detailed theoretical investigation of the first two stages of this invasion process and develop a model of morphological changes of the cone structure that permits noncircular cross sections. In conclusion, we discuss the biological relevance of some structures predicted from our calculations, in particular for the shape of viral capsids.
Collapse
Affiliation(s)
- Marc D Emanuel
- Theoretical Physics of Living Matter, Institute of Biological Information Processing, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.,Kavli Institute for Nanoscience, Technical University Delft, 2628 CJ Delft, Netherlands
| | - Andrey G Cherstvy
- Theoretical Physics of Living Matter, Institute of Biological Information Processing, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.,Institute for Physics & Astronomy, University of Potsdam, 14476 Potsdam-Golm, Germany
| | - Ralf Metzler
- Institute for Physics & Astronomy, University of Potsdam, 14476 Potsdam-Golm, Germany
| | - Gerhard Gompper
- Theoretical Physics of Living Matter, Institute of Biological Information Processing, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| |
Collapse
|
26
|
|
27
|
Schweitzer L, Cunha A, Pereira T, Mika K, Botelho do Rego AM, Ferraria AM, Kieburg H, Geissler S, Uhlmann E, Schoon J. Preclinical In Vitro Assessment of Submicron-Scale Laser Surface Texturing on Ti6Al4V. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E5342. [PMID: 33255765 PMCID: PMC7728373 DOI: 10.3390/ma13235342] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/20/2020] [Accepted: 11/23/2020] [Indexed: 12/14/2022]
Abstract
Loosening of orthodontic and orthopedic implants is a critical and common clinical problem. To minimize the numbers of revision surgeries due to peri-implant inflammation or insufficient osseointegration, developments of new implant manufacturing strategies are indicated. Ultrafast laser surface texturing is a promising contact-free technology to modify the physicochemical properties of surfaces toward an anti-infectious functionalization. This work aims to texture Ti6Al4V surfaces with ultraviolet (UV) and green (GR) radiation for the manufacturing of laser-induced periodic surface structures (LIPSS). The assessment of these surface modifications addresses key aspects of topography, morphology and chemical composition. Human primary mesenchymal stromal cells (hMSCs) were cultured on laser-textured and polished Ti6Al4V to characterize the surfaces in terms of their in vitro biocompatibility, cytotoxicity, and metal release. The outcomes of the in vitro experiment show the successful culture of hMSCs on textured Ti6Al4V surfaces developed within this work. Cells cultured on LIPSS surfaces were not compromised in terms of their viability if compared to polished surfaces. Yet, the hMSC culture on UV-LIPSS show significantly lower lactate dehydrogenase and titanium release into the supernatant compared to polished. Thus, the presented surface modification can be a promising approach for future applications in orthodontics and orthopedics.
Collapse
Affiliation(s)
- Luiz Schweitzer
- Fraunhofer Institute for Production Systems and Design Technology, Pascalstr. 8-9, 10587 Berlin, Germany;
- Department of Orthopedics and Orthopedic Surgery, University Medicine Greifswald, 17475 Greifswald, Germany;
| | - Alexandre Cunha
- SENAI Innovation Institute in Manufacturing Systems and Laser Processing, Rua Arno Waldemar Döhler 308, Joinville, 89218-153 Santa Catarina, Brazil; (A.C.); (T.P.)
- Genetoo Inc., 9841 Washingtonian Blvd, Suite 200, Gaithersburg, MD 20878, USA
| | - Thiago Pereira
- SENAI Innovation Institute in Manufacturing Systems and Laser Processing, Rua Arno Waldemar Döhler 308, Joinville, 89218-153 Santa Catarina, Brazil; (A.C.); (T.P.)
| | - Kerstin Mika
- Julius Wolff Institute, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; (K.M.); (S.G.)
- Berlin Institute of Health Center for Regenerative Therapies, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Ana Maria Botelho do Rego
- BSIRG, Departamento de Engenharia Química, iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal; (A.M.B.d.R.); (A.M.F.)
| | - Ana Maria Ferraria
- BSIRG, Departamento de Engenharia Química, iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal; (A.M.B.d.R.); (A.M.F.)
| | - Heinz Kieburg
- Laser-Mikrotechnologie Dr. Kieburg, James-Frank-Str. 15, 12489 Berlin, Germany;
| | - Sven Geissler
- Julius Wolff Institute, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; (K.M.); (S.G.)
- Berlin Institute of Health Center for Regenerative Therapies, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Eckart Uhlmann
- Fraunhofer Institute for Production Systems and Design Technology, Pascalstr. 8-9, 10587 Berlin, Germany;
- Institute for Machine Tools and Factory Management, Technische Universität Berlin, Pascalstr. 8-9, 10587 Berlin, Germany
| | - Janosch Schoon
- Department of Orthopedics and Orthopedic Surgery, University Medicine Greifswald, 17475 Greifswald, Germany;
- Julius Wolff Institute, Charité Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; (K.M.); (S.G.)
| |
Collapse
|
28
|
Cheng CT, To S, Zhang G. Characterization of intermediate wetting states on micro-grooves by water droplet contact line. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.07.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
29
|
Honig F, Vermeulen S, Zadpoor AA, de Boer J, Fratila-Apachitei LE. Natural Architectures for Tissue Engineering and Regenerative Medicine. J Funct Biomater 2020; 11:E47. [PMID: 32645945 PMCID: PMC7565607 DOI: 10.3390/jfb11030047] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/27/2020] [Accepted: 07/03/2020] [Indexed: 02/07/2023] Open
Abstract
The ability to control the interactions between functional biomaterials and biological systems is of great importance for tissue engineering and regenerative medicine. However, the underlying mechanisms defining the interplay between biomaterial properties and the human body are complex. Therefore, a key challenge is to design biomaterials that mimic the in vivo microenvironment. Over millions of years, nature has produced a wide variety of biological materials optimised for distinct functions, ranging from the extracellular matrix (ECM) for structural and biochemical support of cells to the holy lotus with special wettability for self-cleaning effects. Many of these systems found in biology possess unique surface properties recognised to regulate cell behaviour. Integration of such natural surface properties in biomaterials can bring about novel cell responses in vitro and provide greater insights into the processes occurring at the cell-biomaterial interface. Using natural surfaces as templates for bioinspired design can stimulate progress in the field of regenerative medicine, tissue engineering and biomaterials science. This literature review aims to combine the state-of-the-art knowledge in natural and nature-inspired surfaces, with an emphasis on material properties known to affect cell behaviour.
Collapse
Affiliation(s)
- Floris Honig
- Laboratory for Cell Biology-Inspired Tissue Engineering, MERLN Institute, University of Maastricht, 6229 ET Maastricht, The Netherlands
| | - Steven Vermeulen
- Laboratory for Cell Biology-Inspired Tissue Engineering, MERLN Institute, University of Maastricht, 6229 ET Maastricht, The Netherlands
- BioInterface Science Group, Department of Biomedical Engineering, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Amir A Zadpoor
- Biomaterials and Tissue Biomechanics Section, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands
| | - Jan de Boer
- BioInterface Science Group, Department of Biomedical Engineering, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Lidy E Fratila-Apachitei
- Biomaterials and Tissue Biomechanics Section, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands
| |
Collapse
|
30
|
Wu K, Sun Y, Yuan H, Zhang J, Liu G, Sun J. Harnessing Dynamic Wrinkling Surfaces for Smart Displays. NANO LETTERS 2020; 20:4129-4135. [PMID: 32437167 DOI: 10.1021/acs.nanolett.9b05279] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Reversible and switchable wrinkling surfaces in response to various external stimuli have extensive potential applications. In this Letter, we prepared the reversible wrinkling on poly(dimethylsiloxane) (PDMS) surfaces, responsive to the solvents, by ultraviolet-ozone (UVO) treatment with/without mechanical prestrain. Based on the solvent-responsive wrinkling, three types of optical transparency dynamics were achieved easily in a single and simple film-substrate system, including (I) completely reversible transparency with controlled relaxation time and isotropic light scattering; (II) completely reversible transparency with anisotropic light scattering and tunable diffusion degree; and (III) incompletely reversible transparency. The reversibility and stability of wrinkles can be controlled by tailoring the solvent type, UVO exposure time, and mechanical prestrain. The underlying mechanisms for the three wrinkling dynamics have been clearly elucidated. The extremely simple material system and the facile but efficient technique pave a novel way for realizing versatile optical dynamics for smart displays.
Collapse
Affiliation(s)
- Kai Wu
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
| | - Yu Sun
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
| | - Haozhi Yuan
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
| | - Jinyu Zhang
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
| | - Gang Liu
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
| | - Jun Sun
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P.R. China
| |
Collapse
|
31
|
Abdelrahman MK, Kim H, Maeng J, Ondrusek P, Ware TH. Emergent Surface Topography Enabled by Concurrent Crystallization and Polymerization. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02703] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Mustafa K. Abdelrahman
- Department of Bioengineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, United States
| | - Hyun Kim
- Department of Bioengineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, United States
| | - Jimin Maeng
- Department of Bioengineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, United States
| | - Patrick Ondrusek
- Department of Bioengineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, United States
| | - Taylor H. Ware
- Department of Bioengineering, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, United States
| |
Collapse
|
32
|
Yarysheva A, Strel'tsov D, Malakhov S, Arzhakova O, Yarysheva L, Volynskii A. Surface modification of poly(tetrafluoroethylene) and poly(ethylene terephthalate) films via environmental crazing. POLYM INT 2020. [DOI: 10.1002/pi.5998] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alena Yarysheva
- Faculty of ChemistryLomonosov Moscow State University Moscow Russia
| | | | | | - Olga Arzhakova
- Faculty of ChemistryLomonosov Moscow State University Moscow Russia
| | - Larisa Yarysheva
- Faculty of ChemistryLomonosov Moscow State University Moscow Russia
| | | |
Collapse
|
33
|
Oscurato SL, Formisano F, de Lisio C, d'Ischia M, Gesuele F, Maddalena P, Manini P, Migliaccio L, Pezzella A. Spontaneous wrinkle emergence in nascent eumelanin thin films. SOFT MATTER 2019; 15:9261-9270. [PMID: 31661109 DOI: 10.1039/c9sm01885a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Self-patterning processes originated by physical stimuli have been extensively documented in thin films, whereas spontaneous wrinkling phenomena due to chemical transformation processes are, to the best of our knowledge, unprecedented. Herein we report a case of spontaneous polymerization-driven surface nano-patterning (∼500 nm) that develops in smooth thin solid films of 5,6-dihydroxyindole (DHI), a major precursor of eumelanin polymers, over a time scale of 30 to 60 days in air at room temperature. The phenomenon can be observed only above a critical film thickness of ∼250 nm and it is affected by exposure to ammonia vapors causing acceleration of the oxidation process. The thickness-dependent onset of wrinkling can be attributed to non-homogeneous rates of oxidation through the film causing slow swelling/expansion of the inner layers followed by fast stiffening and cross-linking in the outer layer exposed to higher oxygen levels.
Collapse
Affiliation(s)
- Stefano Luigi Oscurato
- Department of Physics "E. Pancini", University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy.
| | - Fabio Formisano
- Department of Physics "E. Pancini", University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy. and Radboud University, Institute for Molecules and Materials, 6525 AJ Nijmegen, The Netherlands
| | - Corrado de Lisio
- Department of Physics "E. Pancini", University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy. and INFN, Sezione di Napoli, Via Cintia 2, 80126 Napoli, Italy and CNR-SPIN U.O.S. di Napoli, Via Cintia 2, 80126 Napoli, Italy
| | - Marco d'Ischia
- Department of Chemical Sciences, University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy
| | - Felice Gesuele
- Department of Physics "E. Pancini", University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy.
| | - Pasqualino Maddalena
- Department of Physics "E. Pancini", University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy. and CNR-SPIN U.O.S. di Napoli, Via Cintia 2, 80126 Napoli, Italy
| | - Paola Manini
- Department of Chemical Sciences, University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy
| | - Ludovico Migliaccio
- Department of Chemical Sciences, University of Naples "Federico II" Via Cintia 4, I-80126 Naples, Italy
| | - Alessandro Pezzella
- INFN, Sezione di Napoli, Via Cintia 2, 80126 Napoli, Italy and Institute for Polymers, Composites and Biomaterials (IPCB), CNR, Via Campi Flegrei 34, 80078 Pozzuoli (Na), Italy. and National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti, 9, 50121 Florence, Italy
| |
Collapse
|
34
|
He L, Sun Y, Sui X, Wang Z, Liang W. Modeling and Measurement on the Sliding Behavior of Microgrooved Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14133-14140. [PMID: 31573206 DOI: 10.1021/acs.langmuir.9b02418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The sliding behavior of anisotropic surfaces is a crucial property to their applications from fundamental research to practical fields. Herein, we propose a theoretical model for analyzing the sliding behavior based on the concept of adhesion energy. Surface Evolver simulation is conducted to determine the adhesion energy per unit area. The microgrooved surfaces are fabricated and characterized to validate the proposed theory. It is found that the apparent contact angle measured along the direction parallel to the strips increases with the increase of microgroove width, while the corresponding sliding angles exhibit an opposite trend. The adhesion energy per unit area has a constant value regardless of the droplet volume. The different sliding behaviors of anisotropic surfaces along the perpendicular and parallel directions are attributed to the difference in the corresponding adhesion energies per unit area. The proposed model is expected to be used for predicting the sliding behavior of anisotropic surfaces.
Collapse
Affiliation(s)
- Liang He
- College of Aerospace and Civil Engineering , Harbin Engineering University , Nantong Street , Harbin 150001 , China
- AVIC Xi'an Aircraft Industry (Group) Company Ltd. , Xifei Road , Xi'an 710089 , China
- Department of Bioresource Engineering , McGill University , 21111 Lakeshore Road , Sainte-Anne-de-Bellevue , QC H9X 3V9 , Canada
| | - Yongyang Sun
- College of Aerospace and Civil Engineering , Harbin Engineering University , Nantong Street , Harbin 150001 , China
| | - Xin Sui
- College of Aerospace and Civil Engineering , Harbin Engineering University , Nantong Street , Harbin 150001 , China
| | - Zhefeng Wang
- College of Aerospace and Civil Engineering , Harbin Engineering University , Nantong Street , Harbin 150001 , China
| | - Wenyan Liang
- College of Aerospace and Civil Engineering , Harbin Engineering University , Nantong Street , Harbin 150001 , China
| |
Collapse
|
35
|
Box F, O'Kiely D, Kodio O, Inizan M, Castrejón-Pita AA, Vella D. Dynamics of wrinkling in ultrathin elastic sheets. Proc Natl Acad Sci U S A 2019; 116:20875-20880. [PMID: 31570627 PMCID: PMC6800320 DOI: 10.1073/pnas.1905755116] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The wrinkling of thin elastic objects provides a means of generating regular patterning at small scales in applications ranging from photovoltaics to microfluidic devices. Static wrinkle patterns are known to be governed by an energetic balance between the object's bending stiffness and an effective substrate stiffness, which may originate from a true substrate stiffness or from tension and curvature along the wrinkles. Here, we investigate dynamic wrinkling induced by the impact of a solid sphere onto an ultrathin polymer sheet floating on water. The vertical deflection of the sheet's center induced by impact draws material radially inward, resulting in an azimuthal compression that is relieved by the wrinkling of the entire sheet. We show that this wrinkling is truly dynamic, exhibiting features that are qualitatively different to those seen in quasistatic wrinkling experiments. Moreover, we show that the wrinkles coarsen dynamically because of the inhibiting effect of the fluid inertia. This dynamic coarsening can be understood heuristically as the result of a dynamic stiffness, which dominates the static stiffnesses reported thus far, and allows control of wrinkle wavelength.
Collapse
Affiliation(s)
- Finn Box
- Mathematical Institute, University of Oxford, Oxford OX2 6GG, United Kingdom
| | - Doireann O'Kiely
- Mathematical Institute, University of Oxford, Oxford OX2 6GG, United Kingdom
| | - Ousmane Kodio
- Mathematical Institute, University of Oxford, Oxford OX2 6GG, United Kingdom
| | - Maxime Inizan
- Mathematical Institute, University of Oxford, Oxford OX2 6GG, United Kingdom
| | | | - Dominic Vella
- Mathematical Institute, University of Oxford, Oxford OX2 6GG, United Kingdom;
| |
Collapse
|
36
|
Time-Dependent Anisotropic Wetting Behavior of Deterministic Structures of Different Strut Widths on Ti6Al4V. METALS 2019. [DOI: 10.3390/met9090938] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study investigated the wetting behavior of Ti6Al4V surfaces that were groove-structured by means of femtosecond laser irradiation. The material was treated under ambient air conditions by use of a laser wavelength of 1030 nm and a pulse duration of 300 fs. Highly accurate structures with a gap width of 20 µm, a gap depth of 10 µm, and varying strut widths (1–300 µm) were generated and the contact angles in parallel and perpendicular direction were determined using sessile drop method with ultrapure water 1, 8, and 15 days after irradiation. All deterministic surfaces exhibited a pronounced contact angle change over time. The structures showed a strong anisotropic wetting behavior with a maximum contact angle aspect ratio of 2.47 at a strut width of 40 µm and a maximum difference between the parallel and perpendicular contact angle of 47.9° after 1 day.
Collapse
|
37
|
Sanzari I, Dinelli F, Humphrey E, Terracciano C, Prodromakis T. Microstructured hybrid scaffolds for aligning neonatal rat ventricular myocytes. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 103:109783. [PMID: 31349468 DOI: 10.1016/j.msec.2019.109783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 04/23/2019] [Accepted: 05/20/2019] [Indexed: 10/26/2022]
Abstract
In cardiac tissue engineering (TE), in vitro models are essential for the study of healthy and pathological heart tissues in order to understand the underpinning mechanisms. In this scenario, scaffolds are platforms that can realistically mimic the natural architecture of the heart, and they add biorealism to in vitro models. This paper reports a novel and robust technique to fabricate cardiovascular-mimetic scaffolds based on Parylene C and Polydimethylsiloxane (PDMS). Parylene C is employed as a mask material for inducing hybrid and non-hybrid micropatterns to the PDMS layer. Hybrid architectures present striped hydrophobic/hydrophilic surfaces, whereas non-hybrid scaffolds only corrugated topographies. Herein, we demonstrate that wavy features on PDMS can be obtained at the micro- and nanoscale and that PDMS can be integrated into the microfabrication process without changing its intrinsic physical properties. A study of the effects of these scaffolds on the growth of Neonatal Rat Ventricular Myocytes (NRVMs) cultures reveals that cell alignment occurs only for the case of hybrid architectures made of hydrophilic PDMS and hydrophobic Parylene C.
Collapse
Affiliation(s)
- Ilaria Sanzari
- School of Engineering, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom.
| | - Franco Dinelli
- Consiglio Nazionale delle Ricerche (CNR), INO UOS 'A. Gozzini', Area della Ricerca di Pisa - S. Cataldo, via Moruzzi 1, I-56124 Pisa, Italy
| | - Eleanor Humphrey
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Cesare Terracciano
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Themistoklis Prodromakis
- Electronic Materials and Devices Research Group, Zepler Institute for Photonics and Nanoelectronics, University of Southampton, Southampton SO17 1BJ, United Kingdom
| |
Collapse
|
38
|
Noble BA, Raeymaekers B. Polymer Spreading on Unidirectionally Nanotextured Substrates Using Molecular Dynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8784-8789. [PMID: 31180689 DOI: 10.1021/acs.langmuir.9b01050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A unidirectional nanotexture alters the wettability of a substrate and can be used to create patterned polymer films, tailored polymer coverage/reflow, or aligned polymer molecules. However, the physical mechanisms underlying polymer spreading on nanoscale textures are not well-understood, and competing theories exist to explain how texture peaks and grooves alter the wettability of a substrate. We use molecular dynamics to simulate polymer spreading on substrates with unidirectional nanoscale textures as a function of texture shape and size and compare to polymer spreading on a flat substrate. We show that the texture groove shape is the primary factor that modifies polymer spreading on unidirectionally nanotextured substrates because the texture groove shape determines the minimum potential energy of a substrate. At the texture groove, the energy potentials of several surfaces combine, which increases polymer attraction and drives spreading along the texture groove. A texture groove also acts as a sink that inhibits polymer spreading perpendicular to the texture. Texture peaks create energy barriers that inhibit polymer spreading perpendicular to the texture, but this is a secondary mechanism that does not significantly affect anisotropic spreading. This research unifies competing theories of anisotropic liquid spreading documented in the literature and aims to aid in the design of nanoscale textures and ultrathin liquid film systems.
Collapse
Affiliation(s)
- Brooklyn A Noble
- Department of Mechanical Engineering , University of Utah , Salt Lake City , Utah 84112 , United States
| | - Bart Raeymaekers
- Department of Mechanical Engineering , University of Utah , Salt Lake City , Utah 84112 , United States
| |
Collapse
|
39
|
Zeng X, Wang Z, Zhang H, Yang W, Xiang L, Zhao Z, Peng LM, Hu Y. Tunable, Ultrasensitive, and Flexible Pressure Sensors Based on Wrinkled Microstructures for Electronic Skins. ACS APPLIED MATERIALS & INTERFACES 2019; 11:21218-21226. [PMID: 31099240 DOI: 10.1021/acsami.9b02518] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Flexible pressure sensors play an important role in electronic skins (E-Skins), which mimic the mechanical forces sensing properties of human skin. A rational design for a pressure sensor with adjustable characteristics is in high demand for different application scenarios. Here, we present tunable, ultrasensitive, and flexible pressure sensors based on compressible wrinkled microstructures. Modifying the morphology of polydimethylsiloxane (PDMS) microstructure enables the device to obtain different sensitivities and pressure ranges for different requirements. Furthermore, by intentionally introducing hollow structures in the PDMS wrinkles, our pressure sensor exhibits an ultrahigh sensitivity of 14.268 kPa-1. The elastic microstructure-based capacitive sensor also possesses a very low detectable pressure limit (1.5 Pa), a fast response time (<50 ms), a wide pressure range, and excellent cycling stability. Implementing respiratory monitoring and vocalization recognition is realized by attaching the flexible pressure sensor onto the chest and throat, respectively, showing its great application potential for disease diagnosis, monitoring, and other advanced clinical/biological wearable technologies.
Collapse
|
40
|
Lv X, Jiao Y, Wu S, Li C, Zhang Y, Li J, Hu Y, Wu D. Anisotropic Sliding of Underwater Bubbles On Microgrooved Slippery Surfaces by One-Step Femtosecond Laser Scanning. ACS APPLIED MATERIALS & INTERFACES 2019; 11:20574-20580. [PMID: 31090393 DOI: 10.1021/acsami.9b06849] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Slippery liquid-infused surfaces (SLIPS) with excellent liquid sliding abilities have attracted great attention due to their multifunctions in broad fields. However, current research is mainly concentrated on the isotropic SLIPS, and there are few studies about the fabrication of anisotropic SLIPS and the investigation of anisotropic bubble sliding. Herein, we reported a kind of distinct periodic microgrooved slippery surface (MGSS) by one-step femtosecond laser scanning and realized bubble anisotropic sliding in a liquid system. The MGSS enables the bubble to slide along the direction of grooves but prevents the bubble from sliding along the perpendicular direction to the groove. The mechanism is mainly related to the energy barrier difference caused by the spin-coating oil film thickness and the groove height along the parallel and perpendicular directions. The relationship between the driven force of buoyancy and the resistance of contact angle hysteresis was investigated by theoretical analysis, and the theoretical prediction showed a great adherence with the experimental results. We also studied the influence of laser power and groove period on the degree of anisotropy, and it was found that the groove space has little effect on the degree of anisotropy and the strongest bubble anisotropy can reach nearly 80°. Finally, the MGSS was successfully used in anisotropic bubble transportation on flat and curved surfaces. We believe that such functional surfaces will be promising candidates for manipulating bubble directional sliding behavior and further underwater gas collection.
Collapse
Affiliation(s)
- Xiaodong Lv
- School of Instrument Science and Opto-electronics Engineering , Hefei University of Technology , Hefei 230009 , China
| | - Yunlong Jiao
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation , University of Science and Technology of China , Hefei 230026 , China
| | - Sizhu Wu
- School of Instrument Science and Opto-electronics Engineering , Hefei University of Technology , Hefei 230009 , China
| | - Chuanzong Li
- School of Instrument Science and Opto-electronics Engineering , Hefei University of Technology , Hefei 230009 , China
| | - Yiyuan Zhang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation , University of Science and Technology of China , Hefei 230026 , China
| | - Jiawen Li
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation , University of Science and Technology of China , Hefei 230026 , China
| | - Yanlei Hu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation , University of Science and Technology of China , Hefei 230026 , China
| | - Dong Wu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation , University of Science and Technology of China , Hefei 230026 , China
| |
Collapse
|
41
|
Nazarov VG, Doronin FA, Evdokimov AG, Rytikov GO, Stolyarov VP. Oxyfluorination-Controlled Variations in the Wettability of Polymer Film Surfaces. COLLOID JOURNAL 2019. [DOI: 10.1134/s1061933x1902011x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
42
|
Faria-Briceno JJ, Neumann A, Schunk PR, Brueck SRJ. Measuring Liquid Drop Properties on Nanoscale 1D Patterned Photoresist Structures. Sci Rep 2019; 9:5723. [PMID: 30952908 PMCID: PMC6450940 DOI: 10.1038/s41598-019-42106-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/24/2019] [Indexed: 11/25/2022] Open
Abstract
This communication reports liquid wetting properties of DI-water on one-dimensional nano-patterned photoresist lines atop a silicon substrate as the pattern period is varied from 0.3- to 1.0-µm. Both constant photoresist height and constant width/height ratios are investigated. The line/period ratio was fixed at 0.3 (0.4) for different measurement sequences. The surface of the photoresist was treated with a short CHF3 reactive ion etch to ensure consistent hydrophobic photoresist: water surface energies. Average parallel contact angle (θ||), average perpendicular contact angle (θ⊥), drop width (W), and drop length (L) at constant volume were measured on nano-patterned surfaces fabricated with interferometric lithography. Both θ|| and θ⊥ contact angles increase as the period (0.3- to 1-μm) increases; the θ|| spreading rate is faster than θ⊥ due to pinning on the grooves resulting in an elongated drop shape. The traditional Wenzel and Cassie-Baxter models of drop contact angles were developed for isotropic random 2D roughness and do not account for the anisotropy induced by the 1D line patterns. The observed angular variations with period are not consistent with either model. Understanding liquid wetting properties and hydrophobicity on 1D silicon surfaces has many applications in lab-on-a-chip, micro/nano-fluidic devices, roll-to-roll nano-imprint fabrication, self-cleaning surfaces, and micro-reactors.
Collapse
Affiliation(s)
- Juan J Faria-Briceno
- Center for high Technology and Materials and Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, 1313 Goddard St. SE, Albuquerque, New Mexico, 87106, USA.
| | - Alexander Neumann
- Center for high Technology and Materials and Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, 1313 Goddard St. SE, Albuquerque, New Mexico, 87106, USA
| | - P Randall Schunk
- Department of Chemical and Biochemical Engineering, University of New Mexico, Albuquerque, NM, 87131, USA
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, NM, 87106, USA
| | - S R J Brueck
- Center for high Technology and Materials and Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, 1313 Goddard St. SE, Albuquerque, New Mexico, 87106, USA
| |
Collapse
|
43
|
Wang J, Le-The H, Wang Z, Li H, Jin M, van den Berg A, Zhou G, Segerink LI, Shui L, Eijkel JCT. Microfluidics Assisted Fabrication of Three-Tier Hierarchical Microparticles for Constructing Bioinspired Surfaces. ACS NANO 2019; 13:3638-3648. [PMID: 30856322 DOI: 10.1021/acsnano.9b00245] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Construction of textured bioinspired surfaces with refined structures that exhibit superior wetting properties is of great importance for many applications ranging from self-cleaning, antibiofouling, anti-icing, oil/water separation, smart membrane, and microfluidic devices. Previously, the preparation of artificial surfaces generally relies on the combination of different approaches together, which is a lack of flexibility to control over the individual architecture unit, the surface topology, as well as the complex procedure needed. In this work, we report a method for rapid fabrication of three-tier hierarchical microunits (structures consisting of multiple levels) using a facile droplet microfluidics approach. These units include the first-tier microspheres consisting of the second-tier close-packed polystyrene (PS) nanoparticles decorated with the third-tier elegant polymer nanowrinkles. These nanowrinkles on the PS nanoparticles are formed according to the interfacial instability induced by gradient photopolymerization of N-isopropylacrylamide (NIPAM) monomers. The formation process and topologies of nanowrinkles can be regulated by the photopolymerization process and the fraction of carboxylic groups on the PS nanoparticle surface. Such a hierarchical microsphere mimics individual units of bioinspired surfaces. Therefore, the surfaces from self-assembly of these fabricated two-tier and three-tier hierarchical microunits collectively exhibit "gecko" and "rose petal" wetting states, with the micro- and nanoscale structures amplifying the initial hydrophobicity but still being highly adhesive to water. This approach offers promising advantages of high-yield fabrication, precise control over the size and component of the microspheres, and integration of microfluidic droplet generation, colloidal nanoparticle self-assembly, and interfacial polymerization-induced nanowrinkles in a straightforward manner.
Collapse
Affiliation(s)
- Juan Wang
- National Center for International Research on Green Optoelectronics and South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre and Max Planck Center for Complex Fluid Dynamics , University of Twente , Enschede 7522NB , The Netherlands
| | - Hai Le-The
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre and Max Planck Center for Complex Fluid Dynamics , University of Twente , Enschede 7522NB , The Netherlands
| | - Zuankai Wang
- Department of Mechanical and Biomedical Engineering , City University of Hong Kong , Hong Kong 999077 , China
| | - Hao Li
- National Center for International Research on Green Optoelectronics and South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Mingliang Jin
- National Center for International Research on Green Optoelectronics and South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Albert van den Berg
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre and Max Planck Center for Complex Fluid Dynamics , University of Twente , Enschede 7522NB , The Netherlands
| | - Guofu Zhou
- National Center for International Research on Green Optoelectronics and South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Loes I Segerink
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre and Max Planck Center for Complex Fluid Dynamics , University of Twente , Enschede 7522NB , The Netherlands
| | - Lingling Shui
- National Center for International Research on Green Optoelectronics and South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- School of Information and Optoelectronic Science and Engineering , South China Normal University , Guangzhou 510006 , China
| | - Jan C T Eijkel
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre and Max Planck Center for Complex Fluid Dynamics , University of Twente , Enschede 7522NB , The Netherlands
| |
Collapse
|
44
|
Guo P, Sun Y, Zhang Y, Hou X, Song Y, Wang JJ. Biomimetic Self-Cleaning Anisotropic Solid Slippery Surface with Excellent Stability and Restoration. Chemphyschem 2019; 20:946-952. [PMID: 30803116 DOI: 10.1002/cphc.201900098] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 02/20/2019] [Indexed: 11/09/2022]
Abstract
Anisotropic slippery surfaces are widely used in anti-fouling, smart control of liquid movement and directional liquid transportation. However, anisotropic slippery liquid-infused porous surfaces (SLIPS) cannot meet the need of practical applications owing to loss and contamination of liquid lubricants. Inspired by solid epicuticular wax on the surface of land plant leaves, we herein report a type of biomimetic anisotropic solid slippery surface (ASSS) based on paraffin wax-incorporated paper with directional micro-grooves. This ASSS material shows anisotropic sliding behavior for liquid droplets with different surface tensions. It is demonstrated to be of excellent stability compared with SLIPS as the solid lubricant cannot be lost and stain the contacting surfaces. It also exhibits outstanding acid and alkali corrosion resistance and restoration capability upon physical damage. Both hydrophilic and hydrophobic contaminants on our ASSS can be self-cleaned by using only water droplets. Our ASSS extends the fabrication of new slippery materials and overcomes some drawbacks of SLIPS.
Collapse
Affiliation(s)
- Pu Guo
- Key Laboratory of New Energy and New Functional Materials Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry & Chemical Engineering, Yan'an University, 580 Shengdi Road, Yan'an, Shaanxi, 716000, P. R. China
| | - Yimin Sun
- Key Laboratory of New Energy and New Functional Materials Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry & Chemical Engineering, Yan'an University, 580 Shengdi Road, Yan'an, Shaanxi, 716000, P. R. China
| | - Yuqi Zhang
- Key Laboratory of New Energy and New Functional Materials Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry & Chemical Engineering, Yan'an University, 580 Shengdi Road, Yan'an, Shaanxi, 716000, P. R. China
| | - Xueyan Hou
- Key Laboratory of New Energy and New Functional Materials Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry & Chemical Engineering, Yan'an University, 580 Shengdi Road, Yan'an, Shaanxi, 716000, P. R. China
| | - Yanwei Song
- Key Laboratory of New Energy and New Functional Materials Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry & Chemical Engineering, Yan'an University, 580 Shengdi Road, Yan'an, Shaanxi, 716000, P. R. China
| | - Ji-Jiang Wang
- Key Laboratory of New Energy and New Functional Materials Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry & Chemical Engineering, Yan'an University, 580 Shengdi Road, Yan'an, Shaanxi, 716000, P. R. China
| |
Collapse
|
45
|
Glatz BA, Fery A. The influence of plasma treatment on the elasticity of the in situ oxidized gradient layer in PDMS: towards crack-free wrinkling. SOFT MATTER 2018; 15:65-72. [PMID: 30512027 DOI: 10.1039/c8sm01910j] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Controlled surface wrinkling is widely applied for structuring surfaces in the micro- and nano-range. The formation of cracks in the wrinkling process is however limiting applications, and developing approaches towards crack-free wrinkles is therefore vital. To understand crack-formation, we systematically characterized the thickness and mechanics of thin layers formed by O2-plasma-oxidation of polydimethyl siloxane (PDMS) as a function of plasma power and pressure using Atomic Force Microscopy Quantitative Nano-mechanical Mapping (AFM-QNM). We found a nearly constant layer thickness with simultaneously changing Young's moduli for both power and pressure screenings. We determined the respective crack densities, revealing conditions for crack-free wrinkling. Thus we could identify correlations between the intensity of plasma treatment and the cracking behavior. The primary cause for crack-suppression is a continuous elasticity gradient starting within the soft bulk PDMS, and rising up to several hundred MPa at the oxidized layer's surface. With mechanical simulations via the Finite Elements Method (FEM) we were able to demonstrate a noticeable difference in maximal stress intensity σmax between a comparable, but theoretical single layer and a gradient interface. A threshold in tensile stress of σcrit = 14 MPa distinguishes between intact and cracked layers.
Collapse
Affiliation(s)
- Bernhard Alexander Glatz
- Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research Dresden e. V., Hohe Str. 6, 01069 Dresden, Germany. and University of Bayreuth Graduate School, University of Bayreuth, Universitätsstr. 30, 95477 Bayreuth, Germany
| | - Andreas Fery
- Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research Dresden e. V., Hohe Str. 6, 01069 Dresden, Germany. and Chair for Physical Chemistry of Polymeric Materials, Technical University Dresden, Mommsenstr. 4, 01062 Dresden, Germany
| |
Collapse
|
46
|
Auguste A, Yang J, Jin L, Chen D, Suo Z, Hayward RC. Formation of high aspect ratio wrinkles and ridges on elastic bilayers with small thickness contrast. SOFT MATTER 2018; 14:8545-8551. [PMID: 30338335 DOI: 10.1039/c8sm01345d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
An elastic bilayer composed of a stiff film bonded to a soft substrate forms wrinkles under compression. While these uniform and periodic wrinkles initially grow in amplitude with applied strain, the onset of secondary bifurcations such as period doubling typically limit the aspect ratio (i.e., amplitude divided by wavelength) of wrinkles that can be achieved. Here, we present a simple strategy that employs a supported bilayer with comparable thicknesses of the film and substrate to achieve wrinkles with higher aspect ratio. We use both experiments and finite element simulations to reveal that at small thickness contrast, period doubling can be delayed, allowing the wrinkles to grow uniformly to high aspect ratio. In addition, we show that the periodic wrinkles can evolve through symmetry breaking and transition to a periodic pattern of ridges with even higher aspect ratio.
Collapse
Affiliation(s)
- Anesia Auguste
- Department of Polymer Science & Engineering, University of Massachusetts, Amherst, MA 01003, USA.
| | | | | | | | | | | |
Collapse
|
47
|
Pionnier N, Vera J, Contraires E, Benayoun S, Berger R, Valette S. The effect of the orientation and the height of periodic sub-micrometric texturing on dropwise condensation. J Colloid Interface Sci 2018; 526:184-193. [PMID: 29729969 DOI: 10.1016/j.jcis.2018.04.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 04/08/2018] [Accepted: 04/09/2018] [Indexed: 11/29/2022]
Abstract
Controlling condensation conditions by surface topography is of prime interest. The aim of this work is to investigate the behavior of water droplets condensing on oriented sub-micrometric structures representing ripples with wavelengths around 800 nm. Droplet behavior was studied on different ripples heights and on untextured surfaces. It was specifically looked at how the presence of ripples creates geometrical confinement, and how that influences the deformation and the orientation of single droplets. Results show that the condensed droplets follow the orientation of textured features, especially with high structures height (150 nm). This is shown by the decreasing of droplet roundness with ripples height. The relative number of circular droplets (roundness near to 1) is around 0.6 for 70 nm high ripples and decrease to around 0.2 for 150 nm high ripples. The corresponding relative number on untextured surface is around 0.5. A mechanism, based on droplets pinning and hysteresis, is proposed to explain the influence of the ripples orientation in a vertical plane, onto the droplet deformation during coalescence step. Finally, the presence of ripples is shown to barely impact breath figure dynamics. Number of droplets and mean droplet radius for the textured and untextured surfaces present a comparable evolution.
Collapse
Affiliation(s)
- Nicolas Pionnier
- Université de Lyon, Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513, F-69131 Ecully, France.
| | - Julie Vera
- Université de Lyon, Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513, F-69131 Ecully, France
| | - Elise Contraires
- Université de Lyon, Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513, F-69131 Ecully, France
| | - Stéphane Benayoun
- Université de Lyon, Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513, F-69131 Ecully, France
| | - Rémi Berger
- PSA Peugeot Citroën, E78943 Vélizy-Villacoublay, France
| | - Stéphane Valette
- Université de Lyon, Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513, F-69131 Ecully, France.
| |
Collapse
|
48
|
Semprebon C, Herrmann C, Liu BY, Seemann R, Brinkmann M. Shape Evolution of Droplets Growing on Linear Microgrooves. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10498-10511. [PMID: 30088772 DOI: 10.1021/acs.langmuir.8b01712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Anisotropic spreading of liquids and elongated droplet shapes are often encountered on surfaces decorated with a periodic micropattern of linear surface topographies. Numerical calculations and wetting experiments show that the shape evolution of droplets that are slowly growing on a surface with parallel grooves can be grouped into two distinct morphological regimes. In the first regime, the liquid of the growing droplet spreads only into the direction parallel to the grooves. In the second regime, the three-phase contact line advances also perpendicular to the grooves, whereas the growing droplets approach a scale-invariant shape. Here, we demonstrate that shapes of droplets in contact with a large number of linear grooves are identical to the shapes of droplets confined to a plane chemical stripe, where this mapping of shapes is solely based on the knowledge of the cross section of the linear grooves and the material contact angle. The spectrum of interfacial shapes on the chemical stripe can be exploited to predict the particular growth mode and the asymptotic value of the base eccentricity in the limit of droplets covering a large number of grooves. The proposed model shows an excellent agreement with experimentally observed base eccentricities for droplets on grooves of various cross sections. The universality of the model is underlined by the accurate match with available literature data for droplet eccentricities on parallel chemical stripes.
Collapse
Affiliation(s)
- Ciro Semprebon
- Max-Planck Institute for Dynamics and Self-Organization , 37077 Göttingen , Germany
- Smart Materials & Surfaces Laboratory, Department of Mathematics, Physics and Electrical Engineering , Northumbria University , Newcastle NE7 7XA , U.K
| | - Carsten Herrmann
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
| | - Bang-Yan Liu
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
| | - Ralf Seemann
- Max-Planck Institute for Dynamics and Self-Organization , 37077 Göttingen , Germany
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
| | - Martin Brinkmann
- Max-Planck Institute for Dynamics and Self-Organization , 37077 Göttingen , Germany
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
| |
Collapse
|
49
|
Li H, Sheng B, Wu H, Huang Y, Zhang D, Zhuang S. Ring Wrinkle Patterns with Continuously Changing Wavelength Produced Using a Controlled-Gradient Light Field. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1571. [PMID: 30200395 PMCID: PMC6165544 DOI: 10.3390/ma11091571] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 08/24/2018] [Accepted: 08/27/2018] [Indexed: 11/17/2022]
Abstract
We report a facile method to prepare gradient wrinkles using a controlled-gradient light field. Because of the gradient distance between the ultraviolet (UV) lamp and polydimethylsiloxane (PDMS) substrate during UV/ozone treatment, the irradiance reaching the substrate continuously changed, which was transferred into the resulting SiOx film with a varying thickness. Therefore, wrinkles with continuously changing wavelength were fabricated using this approach. It was found that the wrinkle wavelength decreased as the distance increased. We fabricated 1-D wrinkle patterns and ring wrinkles with a gradient wavelength. The ring wrinkles were prepared using radial stresses, which were achieved by pulling the center of a freely hanging PDMS film. The resulting wrinkles with changing wavelength can be used in fluid handling systems, biological templates, and optical devices.
Collapse
Affiliation(s)
- Hongye Li
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education and Shanghai Key Laboratory of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China.
| | - Bin Sheng
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education and Shanghai Key Laboratory of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China.
| | - He Wu
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education and Shanghai Key Laboratory of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China.
| | - Yuanshen Huang
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education and Shanghai Key Laboratory of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China.
| | - Dawei Zhang
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education and Shanghai Key Laboratory of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China.
| | - Songlin Zhuang
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education and Shanghai Key Laboratory of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China.
| |
Collapse
|
50
|
A three-dimensional model for analyzing the anisotropic wetting behavior of striped surfaces. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.05.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|