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Ihalagedara HB, Xu Q, Greer A, Lyons AM. Singlet oxygen generation on a superhydrophobic surface: Effect of photosensitizer coating and incident wavelength on 1O 2 yields. Photochem Photobiol 2024. [PMID: 38824412 DOI: 10.1111/php.13969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 05/02/2024] [Indexed: 06/03/2024]
Abstract
Photochemical generation of singlet oxygen (1O2) often relies on homogenous systems; however, a dissolved photosensitizer (PS) may be unsuitable for some applications because it is difficult to recover, expensive to replenish, and hazardous to the environment. Isolation of the PS onto a solid support can overcome these limitations, but implementation faces other challenges, including agglomeration of the solid PS, physical quenching of 1O2 by the support, photooxidation of the PS, and hypoxic environments. Here, we explore a superhydrophobic polydimethylsiloxane (SH-PDMS) support coated with the photosensitizer 5,10,15,20-tetrakis(pentafluorophenyl)-21H,23H-porphyrin (TFPP). This approach seeks to address the challenges of a heterogeneous system by using a support that exhibits low 1O2 physical quenching rates, a fluorinated PS that is chemically resistant to photooxidation, and a superhydrophobic surface that entraps a layer of air, thus preventing hypoxia. Absorbance and fluorescence spectroscopy reveal the monomeric arrangement of TFPP on SH-PDMS surfaces, a surprising but favorable characteristic for a solid-phase PS on 1O2 yields. We also investigated the effect of incident wavelength on 1O2 yields for TFPP in aqueous solution and immobilized on SH-PDMS and found overall yields to be dependent on the absorption coefficient, while the yield per absorbed photon exhibited wavelength independence, in accordance with Kasha-Vavilov's rule.
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Affiliation(s)
- Hasanuwan B Ihalagedara
- The Graduate Center of the City University of New York, New York, New York, USA
- Department of Chemistry, College of Staten Island, City University of New York, New York, New York, USA
| | - QianFeng Xu
- Department of Chemistry, College of Staten Island, City University of New York, New York, New York, USA
- SingletO2 Therapeutics LLC, Newark, New Jersey, USA
| | - Alexander Greer
- The Graduate Center of the City University of New York, New York, New York, USA
- SingletO2 Therapeutics LLC, Newark, New Jersey, USA
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York, USA
| | - Alan M Lyons
- The Graduate Center of the City University of New York, New York, New York, USA
- Department of Chemistry, College of Staten Island, City University of New York, New York, New York, USA
- SingletO2 Therapeutics LLC, Newark, New Jersey, USA
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Tonon CC, de Souza Rastelli AN, Bodahandi C, Ghosh G, Hasan T, Xu Q, Greer A, Lyons AM. Superhydrophobic Tipped Antimicrobial Photodynamic Therapy Device for the In Vivo Treatment of Periodontitis Using a Wistar Rat Model. ACS APPLIED MATERIALS & INTERFACES 2023; 15:50083-50094. [PMID: 37862708 PMCID: PMC10800031 DOI: 10.1021/acsami.3c12820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2023]
Abstract
Limited options exist for treatment of periodontitis; scaling and root planing (SRP) are not sufficient to eradicate P. gingivalis and the resulting inflammatory disease. Chlorhexidine (CHX), used as an adjuvant to SRP, may reduce bacterial loads but leads to pain and staining, while evidence for its efficacy is lacking. Antibiotics are effective but can lead to drug-resistance. The rising concern of antibiotic resistance limits the future use of this treatment approach. This study evaluates the efficacy of a novel superhydrophobic (SH) antimicrobial photodynamic therapy (aPDT) device as an adjuvant to SRP for the treatment of periodontitis induced in a Wistar rat in vivo model relative to CHX. The SH-aPDT device comprises an SH silicone rubber strip coated with verteporfin photosensitizer (PS), sterilized, and secured onto a tapered plastic optical fiber tip connected to a red diode laser. The superhydrophobic polydimethylsiloxane (PDMS) strips were fabricated by using a novel soluble template method that creates a medical-grade elastomer with hierarchical surface roughness without the use of nanoparticles. Superhydrophobicity minimizes direct contact of the PS-coated surface with bacterial biofilms. Upon insertion of the device tip into the pocket and energizing the laser, the device generates singlet oxygen that effectively targets and eliminates bacteria within the periodontal pocket. SH-aPDT treatment using 125 J/cm2 of red light on three consecutive days reduced P. gingivalis significantly more than SRP-CHX controls (p < 0.05). Clinical parameters significantly improved (p < 0.05), and histology and stereometry results demonstrated SH-aPDT to be the most effective treatment for improving healing and reducing inflammation, with an increase in fibroblast cells and extracellular matrix and a reduction in vascularization, inflammatory cells, and COX-2 expression. The SH-aPDT approach resulted in complete disease clearance assessed 30 days after treatment initiation with significant reduction of the periodontal pocket and re-formation of the junctional epithelium at the enamel-cementum junction. PS isolation on a SH strip minimizes the potential for bacteria to develop resistance, where the treatment may be aided by the oxygen supply retained within the SH surface.
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Affiliation(s)
- Caroline Coradi Tonon
- Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, 40 Blossom St, Boston, MA 02114, United States
| | - Alessandra Nara de Souza Rastelli
- Department of Restorative Dentistry, School of Dentistry, Araraquara, Sao Paulo State University-UNESP, 1680 Humaita St., Araraquara, SP 14801-903, Brazil
| | - Chathuna Bodahandi
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY 10016, United States
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - Goutam Ghosh
- SingletO2 Therapeutics LLC, VentureLink, Room 524B, 211 Warren St, Newark, NJ 07103, United States
| | - Tayyaba Hasan
- Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, 40 Blossom St, Boston, MA 02114, United States
- Division of Health Sciences and Technology, Harvard University and Massachusetts Institute of Technology, Cambridge, MA 02139, United States
| | - QianFeng Xu
- SingletO2 Therapeutics LLC, VentureLink, Room 524B, 211 Warren St, Newark, NJ 07103, United States
| | - Alexander Greer
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY 10016, United States
- SingletO2 Therapeutics LLC, VentureLink, Room 524B, 211 Warren St, Newark, NJ 07103, United States
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, NY 11210, United States
| | - Alan M. Lyons
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY 10016, United States
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
- SingletO2 Therapeutics LLC, VentureLink, Room 524B, 211 Warren St, Newark, NJ 07103, United States
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Liu H, Zhang Z, Wu C, Su K, Kan X. Biomimetic Superhydrophobic Materials through 3D Printing: Progress and Challenges. MICROMACHINES 2023; 14:1216. [PMID: 37374801 DOI: 10.3390/mi14061216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/02/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023]
Abstract
Superhydrophobicity, a unique natural phenomenon observed in organisms such as lotus leaves and desert beetles, has inspired extensive research on biomimetic materials. Two main superhydrophobic effects have been identified: the "lotus leaf effect" and the "rose petal effect", both showing water contact angles larger than 150°, but with differing contact angle hysteresis values. In recent years, numerous strategies have been developed to fabricate superhydrophobic materials, among which 3D printing has garnered significant attention due to its rapid, low-cost, and precise construction of complex materials in a facile way. In this minireview, we provide a comprehensive overview of biomimetic superhydrophobic materials fabricated through 3D printing, focusing on wetting regimes, fabrication techniques, including printing of diverse micro/nanostructures, post-modification, and bulk material printing, and applications ranging from liquid manipulation and oil/water separation to drag reduction. Additionally, we discuss the challenges and future research directions in this burgeoning field.
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Affiliation(s)
- Haishuo Liu
- School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
| | - Zipeng Zhang
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Chenyu Wu
- Qingdao Institute for Theoretical and Computational Sciences, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, China
| | - Kang Su
- School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
| | - Xiaonan Kan
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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Barraza B, Olate-Moya F, Montecinos G, Ortega JH, Rosenkranz A, Tamburrino A, Palza H. Superhydrophobic SLA 3D printed materials modified with nanoparticles biomimicking the hierarchical structure of a rice leaf. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2022; 23:300-321. [PMID: 35557509 PMCID: PMC9090350 DOI: 10.1080/14686996.2022.2063035] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 03/31/2022] [Accepted: 04/03/2022] [Indexed: 06/15/2023]
Abstract
The rice leaf, combining the surface properties of lotus leaves and shark skin, presents outstanding superhydrophobic properties motivating its biomimesis. We created a novel biomimetic rice-leaf superhydrophobic surface by a three-level hierarchical structure, using for a first time stereolithographic (SLA) 3D printed channels (100µm width) with an intrinsic roughness from the printing filaments (10µm), and coated with TiO2 nanoparticles (22 and 100nm). This structure presents a maximum advancing contact angle of 165° characterized by lower both anisotropy and hysteresis contact angles than other 3D printed surfaces, due to the presence of air pockets at the surface/water interface (Cassie-Baxter state). Dynamic water-drop tests show that the biomimetic surface presents self-cleaning, which is reduced under UV-A irradiation. The biomimetic surface further renders an increased floatability to 3D printed objects meaning a drag-reduction due to reduced water/solid contact area. Numerical simulations of a channel with a biomimetic wall confirm that the presence of air is essential to understand our results since it increases the average velocity and decreases the friction factor due to the presence of a wall-slip velocity. Our findings show that SLA 3D printing is an appropriate approach to develop biomimetic superhydrophobic surfaces for future applications in anti-fouling and drag-reduction devices.
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Affiliation(s)
- Belén Barraza
- Matemáticas, Universidad de ChileDepartamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y, Santiago, Chile
- Núcleo Milenio en Metamateriales Mecánicos Suaves e Inteligentes (Millennium Nucleus on Smart Soft Mechanical Metamaterials)
- Advanced Mining Technology Center, Universidad de Chile, Santiago, Chile
| | - Felipe Olate-Moya
- Matemáticas, Universidad de ChileDepartamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y, Santiago, Chile
- Núcleo Milenio en Metamateriales Mecánicos Suaves e Inteligentes (Millennium Nucleus on Smart Soft Mechanical Metamaterials)
| | - Gino Montecinos
- Departamento de Ingeniería Matemática, Universidad de la Frontera, Temuco, Chile
| | - Jaime H. Ortega
- Departamento de Ingeniería Matemática, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile
- Centro de Modelamiento Matemático, IRL 2807 CNRS-UChile, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile
| | - Andreas Rosenkranz
- Matemáticas, Universidad de ChileDepartamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y, Santiago, Chile
| | - Aldo Tamburrino
- Departamento de Ingeniería Civil, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile
| | - Humberto Palza
- Matemáticas, Universidad de ChileDepartamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y, Santiago, Chile
- Núcleo Milenio en Metamateriales Mecánicos Suaves e Inteligentes (Millennium Nucleus on Smart Soft Mechanical Metamaterials)
- Advanced Mining Technology Center, Universidad de Chile, Santiago, Chile
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Liu W, Luo X, Chen C, Jiang G, Hu X, Zhang H, Zhong M. Directional anchoring patterned liquid-infused superamphiphobic surfaces for high-throughput droplet manipulation. LAB ON A CHIP 2021; 21:1373-1384. [PMID: 33569555 DOI: 10.1039/d0lc01037e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
High-throughput experiments involving isolated droplets based on patterned superwettable surfaces are important for various applications related to biology, chemistry, and medicine, and they have attracted a large amount of interest. This paper provides a directional anchoring liquid-infused superamphiphobic surface (DAS), via combining concepts based on the droplet-anchoring behavior of beetle backs with patterned wettability, the directional adhesion of butterfly wings, and the slippery liquid-infused surfaces (SLISs) of pitcher plants. Regularly arranged ">"-shaped SLIS patterns were created on a superamphiphobic (SAM) background through ultrafast-laser-based technology. Improved directional anchoring abilities with a sliding angle difference of 77° were achieved; this is the largest sliding angle difference in a one-dimensional direction achieved using an artificial surface, to the best of the authors' knowledge. Thanks to the directional anchoring abilities, the DAS coupled droplet 'anchoring' and 'releasing' abilities. Furthermore, a high-throughput droplet manipulation device was designed, on which a micro-droplet array with a large number of droplets can be 'captured', 'transferred', or 'released' in a single step. With the addition of lubricant, the DAS can work continuously for even more than 30 cycles without cross-contamination between different droplets. The DAS also shows good stability under an ambient atmosphere and can maintain its functionality when manipulating corrosive droplets. The DAS and corresponding high-throughput droplet manipulation method are excellent candidates for practical applications.
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Affiliation(s)
- Weijian Liu
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, P. R. China.
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Bai Z, Zhang B. Fabrication of superhydrophobic reduced-graphene oxide/nickel coating with mechanical durability, self-cleaning and anticorrosion performance. NANO MATERIALS SCIENCE 2020. [DOI: 10.1016/j.nanoms.2019.05.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Aebisher D, Bartusik-Aebisher D, Belh SJ, Ghosh G, Durantini AM, Liu Y, Xu Q, Lyons AM, Greer A. Superhydrophobic Surfaces as a Source of Airborne Singlet Oxygen through Free Space for Photodynamic Therapy. ACS APPLIED BIO MATERIALS 2020; 3:2370-2377. [DOI: 10.1021/acsabm.0c00114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- David Aebisher
- Faculty of Medicine, University of Rzeszów, 35-310 Rzeszów, Poland
| | | | - Sarah J. Belh
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
| | - Goutam Ghosh
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
| | - Andrés M. Durantini
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- IDAS-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba X5804BYA, Argentina
| | - Yang Liu
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - QianFeng Xu
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - Alan M. Lyons
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
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Pushalkar S, Ghosh G, Xu Q, Liu Y, Ghogare AA, Atem C, Greer A, Saxena D, Lyons AM. Superhydrophobic Photosensitizers: Airborne 1O 2 Killing of an in Vitro Oral Biofilm at the Plastron Interface. ACS APPLIED MATERIALS & INTERFACES 2018; 10:25819-25829. [PMID: 29972022 PMCID: PMC6698391 DOI: 10.1021/acsami.8b09439] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Singlet oxygen is a potent agent for the selective killing of a wide range of harmful cells; however, current delivery methods pose significant obstacles to its widespread use as a treatment agent. Limitations include the need for photosensitizer proximity to tissue because of the short (3.5 μs) lifetime of singlet oxygen in contact with water; the strong optical absorption of the photosensitizer, which limits the penetration depth; and hypoxic environments that restrict the concentration of available oxygen. In this article, we describe a novel superhydrophobic singlet oxygen delivery device for the selective inactivation of bacterial biofilms. The device addresses the current limitations by: immobilizing photosensitizer molecules onto inert silica particles; embedding the photosensitizer-containing particles into the plastron (i.e. the fluid-free space within a superhydrophobic surface between the solid substrate and fluid layer); distributing the particles along an optically transparent substrate such that they can be uniformly illuminated; enabling the penetration of oxygen via the contiguous vapor space defined by the plastron; and stabilizing the superhydrophobic state while avoiding the direct contact of the sensitizer to biomaterials. In this way, singlet oxygen generated on the sensitizer-containing particles can diffuse across the plastron and kill bacteria even deep within the hypoxic periodontal pockets. For the first time, we demonstrate complete biofilm inactivation (>5 log killing) of Porphyromonas gingivalis, a bacterium implicated in periodontal disease using the superhydrophobic singlet oxygen delivery device. The biofilms were cultured on hydroxyapatite disks and exposed to active and control surfaces to assess the killing efficiency as monitored by colony counting and confocal microscopy. Two sensitizer particle types, a silicon phthalocyanine sol-gel and a chlorin e6 derivative covalently bound to fluorinated silica, were evaluated; the biofilm killing efficiency was found to correlate with the amount of singlet oxygen detected in separate trapping studies. Finally, we discuss the applications of such devices in the treatment of periodontitis.
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Affiliation(s)
- Smruti Pushalkar
- Department of Basic Sciences and Craniofacial Biology, New York University College of Dentistry, New York 10010, United States
| | - Goutam Ghosh
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
| | - QianFeng Xu
- SingletO2 Therapeutics LLC, 215 W 125 St., 4 Floor, New York, NY 10027, United States
| | - Yang Liu
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Ashwini A. Ghogare
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Cecilia Atem
- Department of Basic Sciences and Craniofacial Biology, New York University College of Dentistry, New York 10010, United States
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
- SingletO2 Therapeutics LLC, 215 W 125 St., 4 Floor, New York, NY 10027, United States
| | - Deepak Saxena
- Department of Basic Sciences and Craniofacial Biology, New York University College of Dentistry, New York 10010, United States
| | - Alan M. Lyons
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
- SingletO2 Therapeutics LLC, 215 W 125 St., 4 Floor, New York, NY 10027, United States
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Chen X, Liu Y, Xu Q, Zhu J, Poget SF, Lyons AM. High-Precision Dispensing of Nanoliter Biofluids on Glass Pedestal Arrays for Ultrasensitive Biomolecule Detection. ACS APPLIED MATERIALS & INTERFACES 2016; 8:10788-10799. [PMID: 27070413 DOI: 10.1021/acsami.6b02487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Precise dispensing of nanoliter droplets is necessary for the development of sensitive and accurate assays, especially when the availability of the source solution is limited. Conventional approaches are limited by imprecise positioning, large shear forces, surface tension effects, and high costs. To address the need for precise and economical dispensing of nanoliter volumes, we developed a new approach where the dispensed volume is dependent on the size and shape of defined surface features, thus freeing the dispensing process from pumps and fine-gauge needles requiring accurate positioning. The surface we fabricated, called a nanoliter droplet virtual well microplate (nVWP), achieves high-precision dispensing (better than ±0.5 nL or ±1.6% at 32 nL) of 20-40 nL droplets using a small source drop (3-10 μL) on isolated hydrophilic glass pedestals (500 μm on a side) bonded to arrays of polydimethylsiloxane conical posts. The sharp 90° edge of the glass pedestal pins the solid-liquid-vapor triple contact line (TCL), averting the wetting of the glass sidewalls while the fluid is prevented from receding from the edge. This edge creates a sufficiently large energy barrier such that microliter water droplets can be poised on the glass pedestals, exhibiting contact angles greater >150°. This approach relieves the stringent mechanical alignment tolerances required for conventional dispensing techniques, shifting the control of dispensed volume to the area circumscribed by the glass edge. The effects of glass surface chemistry and dispense velocity on droplet volume were studied using optical microscopy and high-speed video. Functionalization of the glass pedestal surface enabled the selective adsorption of specific peptides and proteins from synthetic and natural biomolecule mixtures, such as venom. We further demonstrate how the nVWP dispensing platform can be used for a variety of assays, including sensitive detection of proteins and peptides by fluorescence microscopy or MALDI-TOF.
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Affiliation(s)
- Xiaoxiao Chen
- ARL Designs LLC, 215 West 125th Street, New York, New York 10027, United States
| | - Yang Liu
- Department of Chemistry, College of Staten Island, City University of New York , 2800 Victory Boulevard, Staten Island, New York 10314, United States
- Ph.D. Program in Chemistry, The Graduate Center, City University of New York , 365 Fifth Avenue, New York, New York 10314, United States
| | - QianFeng Xu
- ARL Designs LLC, 215 West 125th Street, New York, New York 10027, United States
- Department of Chemistry, College of Staten Island, City University of New York , 2800 Victory Boulevard, Staten Island, New York 10314, United States
| | - Jing Zhu
- Department of Chemistry, College of Staten Island, City University of New York , 2800 Victory Boulevard, Staten Island, New York 10314, United States
| | - Sébastien F Poget
- Department of Chemistry, College of Staten Island, City University of New York , 2800 Victory Boulevard, Staten Island, New York 10314, United States
- Ph.D. Program in Chemistry, The Graduate Center, City University of New York , 365 Fifth Avenue, New York, New York 10314, United States
| | - Alan M Lyons
- ARL Designs LLC, 215 West 125th Street, New York, New York 10027, United States
- Department of Chemistry, College of Staten Island, City University of New York , 2800 Victory Boulevard, Staten Island, New York 10314, United States
- Ph.D. Program in Chemistry, The Graduate Center, City University of New York , 365 Fifth Avenue, New York, New York 10314, United States
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Mondal B, Mac Giolla Eain M, Xu Q, Egan VM, Punch J, Lyons AM. Design and Fabrication of a Hybrid Superhydrophobic-Hydrophilic Surface That Exhibits Stable Dropwise Condensation. ACS APPLIED MATERIALS & INTERFACES 2015; 7:23575-23588. [PMID: 26372672 DOI: 10.1021/acsami.5b06759] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Condensation of water vapor is an essential process in power generation, water collection, and thermal management. Dropwise condensation, where condensed droplets are removed from the surface before coalescing into a film, has been shown to increase the heat transfer efficiency and water collection ability of many surfaces. Numerous efforts have been made to create surfaces which can promote dropwise condensation, including superhydrophobic surfaces on which water droplets are highly mobile. However, the challenge with using such surfaces in condensing environments is that hydrophobic coatings can degrade and/or water droplets on superhydrophobic surfaces transition from the mobile Cassie to the wetted Wenzel state over time and condensation shifts to a less-effective filmwise mechanism. To meet the need for a heat-transfer surface that can maintain stable dropwise condensation, we designed and fabricated a hybrid superhydrophobic-hydrophilic surface. An array of hydrophilic needles, thermally connected to a heat sink, was forced through a robust superhydrophobic polymer film. Condensation occurs preferentially on the needle surface due to differences in wettability and temperature. As the droplet grows, the liquid drop on the needle remains in the Cassie state and does not wet the underlying superhydrophobic surface. The water collection rate on this surface was studied using different surface tilt angles, needle array pitch values, and needle heights. Water condensation rates on the hybrid surface were shown to be 4 times greater than for a planar copper surface and twice as large for silanized silicon or superhydrophobic surfaces without hydrophilic features. A convection-conduction heat transfer model was developed; predicted water condensation rates were in good agreement with experimental observations. This type of hybrid superhydrophobic-hydrophilic surface with a larger array of needles is low-cost, robust, and scalable and so could be used for heat transfer and water collection applications.
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Affiliation(s)
- Bikash Mondal
- Department of Chemistry, College of Staten Island and the Graduate Center, The City University of New York , Staten Island, New York 10314, United States
| | - Marc Mac Giolla Eain
- Stokes Laboratories, Department of Mechanical, Aeronautical & Biomedical Engineering, University of Limerick , Limerick, Ireland
| | - QianFeng Xu
- ARL Designs , New York, New York, United States
| | - Vanessa M Egan
- Stokes Laboratories, Department of Mechanical, Aeronautical & Biomedical Engineering, University of Limerick , Limerick, Ireland
| | - Jeff Punch
- Stokes Laboratories, Department of Mechanical, Aeronautical & Biomedical Engineering, University of Limerick , Limerick, Ireland
| | - Alan M Lyons
- Department of Chemistry, College of Staten Island and the Graduate Center, The City University of New York , Staten Island, New York 10314, United States
- ARL Designs , New York, New York, United States
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Park SH, Lee S, Moreira D, Bandaru PR, Han I, Yun DJ. Bioinspired superhydrophobic surfaces, fabricated through simple and scalable roll-to-roll processing. Sci Rep 2015; 5:15430. [PMID: 26490133 PMCID: PMC4651109 DOI: 10.1038/srep15430] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 09/08/2015] [Indexed: 12/02/2022] Open
Abstract
A simple, scalable, non-lithographic, technique for fabricating durable superhydrophobic (SH) surfaces, based on the fingering instabilities associated with non-Newtonian flow and shear tearing, has been developed. The high viscosity of the nanotube/elastomer paste has been exploited for the fabrication. The fabricated SH surfaces had the appearance of bristled shark skin and were robust with respect to mechanical forces. While flow instability is regarded as adverse to roll-coating processes for fabricating uniform films, we especially use the effect to create the SH surface. Along with their durability and self-cleaning capabilities, we have demonstrated drag reduction effects of the fabricated films through dynamic flow measurements.
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Affiliation(s)
- Sung-Hoon Park
- Department of Mechanical engineering, Soongsil University,
369 Sangdo-ro, Dongjak-gu, Seoul,
156-743, Korea
| | - Sangeui Lee
- Material Research Center, Samsung Advanced Institute of
Technology, Yongin-si, Gyeonggi-do,
446-712, Korea
| | - David Moreira
- Department of Mechanical & Aerospace Engineering, University
of California,San Diego, La Jolla, CA
92093-0411, USA
| | - Prabhakar R. Bandaru
- Department of Mechanical & Aerospace Engineering, University
of California,San Diego, La Jolla, CA
92093-0411, USA
| | - InTaek Han
- Material Research Center, Samsung Advanced Institute of
Technology, Yongin-si, Gyeonggi-do,
446-712, Korea
| | - Dong-Jin Yun
- Material Research Center, Samsung Advanced Institute of
Technology, Yongin-si, Gyeonggi-do,
446-712, Korea
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12
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Zhao Y, Liu Y, Xu Q, Barahman M, Lyons AM. Catalytic, self-cleaning surface with stable superhydrophobic properties: printed polydimethylsiloxane (PDMS) arrays embedded with TiO2 nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2015; 7:2632-2640. [PMID: 25525836 DOI: 10.1021/am5076315] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Maintaining the long-term stability of superhydrophobic surfaces is challenging because of contamination from organic molecules and proteins that render the surface hydrophilic. Reactive oxygen species generated on a photocatalyst, such as TiO2, could mitigate this effect by oxidizing these contaminants. However, incorporation of such catalyst particles into a superhydrophobic surface is challenging because the particles become hydrophilic under UV exposure, causing the surface to transition to the Wenzel state. Here we show that a high concentration of hydrophilic TiO2 catalytic nanoparticles can be incorporated into a superhydrophobic surface by partially embedding the particles into a printed array of high aspect ratio polydimethylsiloxane posts. A stable Cassie state was maintained on these surfaces, even under UV irradiation, because of the significant degree of hierarchical roughness. By printing the surface on a porous support, oxygen could be flowed through the plastron, resulting in higher photooxidation rates relative to a static ambient. Rhodamine B and bovine serum albumin were photooxidized both in solution and after drying onto these TiO2-containing surfaces, and the effects of particle location and plastron gas composition were studied in static and flowing gas environments. This approach may prove useful for water purification, medical devices, and other applications where Cassie stability is required in the presence of organic compounds.
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Affiliation(s)
- Yuanyuan Zhao
- Department of Chemistry, College of Staten Island, City University of New York , Staten Island, New York 10314, United States
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13
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Zhao Y, Liu Y, Xu Q, Barahman M, Bartusik D, Greer A, Lyons AM. Singlet oxygen generation on porous superhydrophobic surfaces: effect of gas flow and sensitizer wetting on trapping efficiency. J Phys Chem A 2014; 118:10364-71. [PMID: 24885074 PMCID: PMC4234451 DOI: 10.1021/jp503149x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We describe physical-organic studies of singlet oxygen generation and transport into an aqueous solution supported on superhydrophobic surfaces on which silicon-phthalocyanine (Pc) particles are immobilized. Singlet oxygen ((1)O2) was trapped by a water-soluble anthracene compound and monitored in situ using a UV-vis spectrometer. When oxygen flows through the porous superhydrophobic surface, singlet oxygen generated in the plastron (i.e., the gas layer beneath the liquid) is transported into the solution within gas bubbles, thereby increasing the liquid-gas surface area over which singlet oxygen can be trapped. Higher photooxidation rates were achieved in flowing oxygen, as compared to when the gas in the plastron was static. Superhydrophobic surfaces were also synthesized so that the Pc particles were located in contact with, or isolated from, the aqueous solution to evaluate the relative effectiveness of singlet oxygen generated in solution and the gas phase, respectively; singlet oxygen generated on particles wetted by the solution was trapped more efficiently than singlet oxygen generated in the plastron, even in the presence of flowing oxygen gas. A mechanism is proposed that explains how Pc particle wetting, plastron gas composition and flow rate as well as gas saturation of the aqueous solution affect singlet oxygen trapping efficiency. These stable superhydrophobic surfaces, which can physically isolate the photosensitizer particles from the solution may be of practical importance for delivering singlet oxygen for water purification and medical devices.
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Affiliation(s)
- Yuanyuan Zhao
- Department of Chemistry, College of Staten Island, City University of New York , Staten Island, New York 10314, United States
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14
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Drotlef DM, Blümler P, Papadopoulos P, Del Campo A. Magnetically actuated micropatterns for switchable wettability. ACS APPLIED MATERIALS & INTERFACES 2014; 6:8702-7. [PMID: 24803340 DOI: 10.1021/am5014776] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Arrays of actuated magnetic micropillars that can be tilted, twisted, and rotated in the presence of a magnetic field gradient were obtained. The type and extent of the movements are dependent on the distribution (isotropic, anisotropic) of the magnetizable particles inside the pillars and the strength and the direction of the magnetic field gradient. Independent motion of groups of pillars in the same or opposite directions or homogeneous motion of the whole pattern has been realized. Changing the pattern geometry causes changes in the roll-off angle (ROA) of water droplets on the surface. We show magnetically induced changes in the ROA and direction-dependent ROAs as a consequence of the anisotropy of tilted patterns. We also demonstrate transfer of microparticles between magnetically actuated neighboring pillars.
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Affiliation(s)
- Dirk-M Drotlef
- Max-Planck-Institut für Polymerforschung , Ackermannweg 10, 55128 Mainz, Germany
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15
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Wang X, Cai X, Guo Q, Zhang T, Kobe B, Yang J. i3DP, a robust 3D printing approach enabling genetic post-printing surface modification. Chem Commun (Camb) 2014; 49:10064-6. [PMID: 24002351 DOI: 10.1039/c3cc45817b] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Initiator integrated 3D printing, namely i3DP, was developed by incorporating a vinyl-terminated initiator into UV curable resin to make functional structural materials that enable genetic post-printing surface-initiated modification. Taking advantage of 3D printing and surface-initiated ATRP, the feasible i3DP makes 3D printed complex architectures possible for nearly any desired surface modification for various applications, for example, even pouring water into a sieve was readily achieved.
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Affiliation(s)
- Xiaolong Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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16
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Aebisher D, Bartusik D, Liu Y, Zhao Y, Barahman M, Xu Q, Lyons AM, Greer A. Superhydrophobic photosensitizers. Mechanistic studies of (1)O2 generation in the plastron and solid/liquid droplet interface. J Am Chem Soc 2013; 135:18990-8. [PMID: 24295210 DOI: 10.1021/ja410529q] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We describe here a physical-organic study of the first triphasic superhydrophobic sensitizer for photooxidations in water droplets. Control of synthetic parameters enables the mechanistic study of "borderline" two- and three-phase superhydrophobic sensitizer surfaces where (1)O2 is generated in compartments that are wetted, partially wetted, or remain dry in the plastron (i.e., air layer beneath the droplet). The superhydrophobic surface is synthesized by partially embedding silicon phthalocyanine (Pc) sensitizing particles to specific locations on polydimethylsiloxane (PDMS) posts printed in a square array (1 mm tall posts on 0.5 mm pitch). In the presence of red light and oxygen, singlet oxygen is formed on the superhydrophobic surface and reacts with 9,10-anthracene dipropionate dianion (1) within a freestanding water droplet to produce an endoperoxide in 54-72% yields. Control of the (1)O2 chemistry was achieved by the synthesis of superhydrophobic surfaces enriched with Pc particles either at the PDMS end-tips or at PDMS post bases. Much of the (1)O2 that reacts with anthracene 1 in the droplets was generated by the sensitizer "wetted" at the Pc particle/water droplet interface and gave the highest endoperoxide yields. About 20% of the (1)O2 can be introduced into the droplet from the plastron. The results indicate that the superhydrophobic sensitizer surface offers a unique system to study (1)O2 transfer routes where a balance of gas and liquid contributions of (1)O2 is tunable within the same superhydrophobic surface.
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Affiliation(s)
- David Aebisher
- Department of Natural Sciences, Shorter University , Rome, Georgia 30165, United States
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17
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You I, Yun N, Lee H. Surface-Tension-Confined Microfluidics and Their Applications. Chemphyschem 2013; 14:471-81. [DOI: 10.1002/cphc.201200929] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Indexed: 11/08/2022]
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18
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Duncombe TA, Parsons JF, Böhringer KF. Directed drop transport rectified from orthogonal vibrations via a flat wetting barrier ratchet. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13765-13770. [PMID: 22934529 DOI: 10.1021/la3024309] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We introduce the wetting barrier ratchet, a digital microfluidic technology for directed drop transport in an open air environment. Cyclic drop footprint oscillations initiated by orthogonal vibrations as low as 37 μm in amplitude at 82 Hz are rectified into fast (mm/s) and controlled transport along a fabricated ratchet design. The ratchet is made from a simple wettability pattern atop a microscopically flat surface consisting of periodic semi-circular hydrophilic features on a hydrophobic background. The microfluidic ratchet capitalizes on the asymmetric contact angle hysteresis induced by the curved features to drive transport. In comparison to the previously reported texture ratchets, wetting barrier ratchets require 3-fold lower actuation amplitudes for a 10 μL drop, have a simplified fabrication, and can be made optically flat for applications where transparency is paramount.
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Affiliation(s)
- Todd A Duncombe
- Department of Electrical Engineering, University of Washington, Seattle, Washington 98195, USA
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19
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Rahman MA, Jacobi AM. Wetting behavior and drainage of water droplets on microgrooved brass surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13441-13451. [PMID: 22909187 DOI: 10.1021/la302669g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In the present study, contact angle hysteresis and sliding behavior of water droplets on parallel, periodic microgrooved brass surfaces are investigated experimentally for enhancement of water drainage and compared to that on flat baseline surfaces. The surfaces (a total of 17 microgrooved samples, with a range of groove depth of 22 to 109 μm, pillar width of 26 to 190 μm, and groove width of 103 and 127 μm) are fabricated using a mechanical micromachining process. The wetting state and shape/elongation of deposited water droplets, anisotropy of the contact angle hysteresis, and the drainage behavior of water droplets on the microgrooved surfaces are found to be strongly dependent on the topography of the groove geometry, which is analyzed in detail. The wetting state is found to be Wenzel for microgrooved surfaces with very low aspect ratio (<0.2) and narrow pillars (pillar width to groove width ratio of ≈0.2), and also for the two deepest grooved surfaces of two different sample series, all of which exhibit high contact angle hysteresis. Mechanisms of the advancing and receding motions are identified. The critical sliding angle (the angle from horizontal at incipient motion of the advancing confluence) for the microgrooved surfaces is found to be significantly smaller than for flat surfaces. The sliding angle exhibits significant groove geometry dependence and is found to increase with pillar width and decrease with groove depth. The findings of this study may be useful in a broad range of applications where water retention plays an important role.
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Affiliation(s)
- M Ashiqur Rahman
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W. Green Street, Urbana, Illinois 61801, USA.
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Xu QF, Mondal B, Lyons AM. Fabricating superhydrophobic polymer surfaces with excellent abrasion resistance by a simple lamination templating method. ACS APPLIED MATERIALS & INTERFACES 2011; 3:3508-14. [PMID: 21797228 DOI: 10.1021/am200741f] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Fabricating robust superhydrophobic surfaces for commercial applications is challenging as the fine-scale surface features, necessary to achieve superhydrophobicity, are susceptible to mechanical damage. Herein, we report a simple and inexpensive lamination templating method to create superhydrophobic polymer surfaces with excellent abrasion resistance and water pressure stability. To fabricate the surfaces, polyethylene films were laminated against woven wire mesh templates. After cooling, the mesh was peeled from the polymer creating a 3D array of ordered polymer microposts on the polymer surface. The resulting texture is monolithic with the polymer film and requires no chemical modification to exhibit superhydrophobicity. By controlling lamination parameters and mesh dimensions, polyethylene surfaces were fabricated that exhibit static contact angles of 160° and slip angles of 5°. Chemical and mechanical stability was evaluated using an array of manual tests as well as a standard reciprocating abraser test. Surfaces remained superhydrophobic after more than 5500 abrasion cycles at a pressure of 32.0 kPa. In addition, the surface remains dry after immersing into water for 5 h at 55 kPa. This method is environmental friendly, as it employs no solvents or harsh chemicals and may provide an economically viable path to manufacture large areas of mechanically robust superhydrophobic surfaces from inexpensive polymers and reusable templates.
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Affiliation(s)
- Qian Feng Xu
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
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