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Zhao X, Li D, Zhu J, Fan Y, Xu J, Huang X, Nie Z, Chen D. Stably Grafting Polymer Brushes on Both Active and Inert Surfaces Using Tadpole-Like Single-Chain Particles with an Interactive "Head". ACS Macro Lett 2024; 13:882-888. [PMID: 38953383 DOI: 10.1021/acsmacrolett.4c00341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
We report a "grafting to" method for stably grafting high-molecular-weight polymer brushes on both active and inert surfaces using tadpole-like single-chain particles (TSCPs) with an interactive "head" as grafting units. The TSCPs can be efficiently synthesized through intrachain cross-linking one block of a diblock copolymer; the "head" is the intrachain cross-linked single-chain particle, and the "tail" is a linear polymer chain that has a contour length up to micrometers. When grafted to a surface, the "head", integrating numerous interacting groups, can synergize multiple weak interactions with the surface, thereby enabling stable grafting of the "tail" on both active and traditionally challenging inert surfaces. Because the structural parameters and composition of the "heads" and "tails" can be separately adjusted over a wide range, the interactivity of the "heads" with the surface and properties of the brushes can be controlled orthogonally, accomplishing surface brushes that cannot be achieved by existing methods.
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Affiliation(s)
- Xiaoya Zhao
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai, 200438, People's Republic of China
| | - Dahua Li
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai, 200438, People's Republic of China
| | - Jie Zhu
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai, 200438, People's Republic of China
| | - Yanbin Fan
- The Dow Chemical Company, 936 Zhangheng Road, Shanghai, 201203, People's Republic of China
| | - Jiayin Xu
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai, 200438, People's Republic of China
| | - Xiayun Huang
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai, 200438, People's Republic of China
| | - Zhihong Nie
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai, 200438, People's Republic of China
| | - Daoyong Chen
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai, 200438, People's Republic of China
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2
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Asrafali SP, Periyasamy T, Kim SC, Lee JW. Enhanced Wettability and Adhesive Property of PTFE through Surface Modification with Fluorinated Compounds. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3051. [PMID: 38998134 PMCID: PMC11242136 DOI: 10.3390/ma17133051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 06/17/2024] [Accepted: 06/19/2024] [Indexed: 07/14/2024]
Abstract
Polytetrafluoroethylene (PTFE) is prized for its unique properties in electrical applications, but its natural hydrophobicity poses challenges as it repels water and can cause electrical short circuits, shortening equipment lifespan. In this work, the mentioned issue has been tackled by using two different fluorinated compounds, such as perfluorooctanoic acid (PFOA)/perfluorooctanol (PFOL), along with plasma processing to enhance the surface hydrophilicity (water attraction) of PTFE. This method, demonstrated on Teflon membrane, quickly transformed their surfaces from hydrophobic to hydrophilic in less than 30 s. The treated films achieved a water contact angle saturation of around 80°, indicating a significant increase in water affinity. High-resolution C 1s X-ray photoelectron spectroscopy (XPS) confirmed the formation of new bonds, such as -COOH and -OH, on the surface, responsible for enhanced hydrophilicity. Extended plasma treatment led to further structural changes, evidenced by increased intensity in infrared (IR) and Raman spectra, particularly sensitive to vibrations associated with the C-F bond. Moreover, Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR) showed the formation of surface-linked functional groups, which contributed to the improved water attraction. These findings decisively show that treatment with fluoro-compound along with plasma processing can be considered as a highly effective and rapid method for converting PTFE surfaces from hydrophobic to hydrophilic, facilitating its broader use in various electrical applications.
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Affiliation(s)
| | - Thirukumaran Periyasamy
- Department of Fiber System Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Seong-Cheol Kim
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Jae-Woong Lee
- Department of Fiber System Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
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3
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Abidin NZ, Hashim H, Zubairi SI, Maskat MY, Purhanudin N, Awang R, Ali JM, Yaakob H. Enhancing polytetrafluoroethylene (PTFE) coated film for food processing: Unveiling surface transformations through oxygenated plasma treatment and parameter optimization using response surface methodology. PLoS One 2024; 19:e0303931. [PMID: 38820420 PMCID: PMC11142506 DOI: 10.1371/journal.pone.0303931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Accepted: 05/02/2024] [Indexed: 06/02/2024] Open
Abstract
Spray drying fruit juice powders poses challenges because sugars and organic acids with low molecular weight and a low glass transition temperature inherently cause stickiness. This study employed a hydrophobic polytetrafluoroethylene (PTFE) film to mimic the surface of the drying chamber wall. The Central Composite Design (CCD) using response surface methodology investigated the impact of power (X1, Watt) and the duration of oxygenated plasma treatment (X2, minutes) on substrate contact angle (°), reflecting surface hydrophobicity. To validate the approach, Morinda citrofolia (MC) juice, augmented with maltodextrins as drying agents, underwent spray drying on the improved PTFE-coated surface. The spray drying process for MC juice was performed at inlet air temperatures of 120, 140, and 160°C, along with Noni juice-to-maltodextrin solids ratios of 4.00, 1.00, and 0.25. The PTFE-coated borosilicate substrate, prepared at a radio frequency (RF) power of 90W for 15 minutes of treatment time, exhibited a porous and spongy microstructure, correlating with superior contact angle performance (171°) compared to untreated borosilicate glass. Optimization data indicated that the PTFE film attained an optimum contact angle of 146.0° with a specific combination of plasma RF operating power (X1 = 74 W) and treatment duration (X2 = 10.0 minutes). RAMAN spectroscopy indicated a structural analysis with an ID/IG ratio of 0.2, while Brunauer-Emmett-Teller (BET) surface area analysis suggested an average particle size of less than 100 nm for all coated films. The process significantly improved the powder's hygroscopicity, resistance to caking, and moisture content of maltodextrin-MC juice. Therefore, the discovery of this modification, which applies oxygen plasma treatment to PTFE-coated substrates, effectively enhances surface hydrophobicity, contact angle, porosity, roughness, and ultimately improves the efficacy and recovery of the spray drying process.
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Affiliation(s)
- Noraziani Zainal Abidin
- Department of Food Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, Malaysia
| | - Haslaniza Hashim
- Department of Food Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, Malaysia
| | - Saiful Irwan Zubairi
- Department of Food Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, Malaysia
| | - Mohamad Yusof Maskat
- Department of Food Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, Malaysia
| | - Noorain Purhanudin
- Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, Malaysia
| | - Rozidawati Awang
- Department of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, Malaysia
| | - Jarinah Mohd Ali
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, Malaysia
| | - Harisun Yaakob
- Institute Bioproduct Development (IBD), Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
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4
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Serpelloni S, Williams ME, Caserta S, Sharma S, Rahimi M, Taraballi F. Electrospun Chitosan-Based Nanofibrous Coating for the Local and Sustained Release of Vancomycin. ACS OMEGA 2024; 9:11701-11717. [PMID: 38496925 PMCID: PMC10938330 DOI: 10.1021/acsomega.3c08113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 02/07/2024] [Accepted: 02/13/2024] [Indexed: 03/19/2024]
Abstract
As the population ages, the number of vascular surgery procedures performed increases. Older adults often have multiple comorbidities, such as diabetes and hypertension, that increase the risk of complications from vascular surgery including vascular graft infection (VGI). VGI is a serious complication with significant morbidity, mortality, and healthcare costs. Here, we aimed to develop a nanofibrous chitosan-based coating for vascular grafts loaded with different concentrations of the vancomycin antibiotic vancomycin (VAN). Blending chitosan with poly(vinyl alcohol) or poly(ethylene oxide) copolymers improved solubility and ease of spinning. Thermal gravimetric analysis and Fourier transform infrared spectroscopy confirmed the presence of VAN in the nanofibrous membranes. Kinetics of VAN release from the nanofibrous mats were evaluated using high-performance liquid chromatography, showing a burst followed by sustained release over 24 h. To achieve longer sustained release, a poly(lactic-co-glycolic acid) coating was applied, resulting in extended release of up to 7 days. Biocompatibility assessment using human umbilical vein endothelial cells demonstrated successful attachment and viability of the nanofiber patches. Our study provides insights into the development of a drug delivery system for vascular grafts aimed at preventing infection during implantation, highlighting the potential of electrospinning as a promising technique in the field of vascular surgery.
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Affiliation(s)
- Stefano Serpelloni
- Center
for Musculoskeletal Regeneration, Houston
Methodist Academic Institute, Houston, Texas 77030-2707, United States
- Department
of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan 20133, Italy
- Department
of Orthopedics and Sport Medicine, Houston
Methodist Hospital, Houston, Texas 77030-2707, United States
| | - Michael Ellis Williams
- Center
for Musculoskeletal Regeneration, Houston
Methodist Academic Institute, Houston, Texas 77030-2707, United States
- Reproductive
Biology and Gynaecological Oncology Group, Swansea University Medical School, Singleton Park, Swansea SA2 8QA, U.K.
| | - Sergio Caserta
- Department
of Chemical Materials and Industrial Production Engineering, University of Naples Federico II, Naples 80138, Italy
| | - Shashank Sharma
- Department
of Cardiovascular Surgery, Houston Methodist
Hospital, Houston, Texas 77030-2707, United States
| | - Maham Rahimi
- Department
of Cardiovascular Surgery, Houston Methodist
Hospital, Houston, Texas 77030-2707, United States
| | - Francesca Taraballi
- Center
for Musculoskeletal Regeneration, Houston
Methodist Academic Institute, Houston, Texas 77030-2707, United States
- Department
of Orthopedics and Sport Medicine, Houston
Methodist Hospital, Houston, Texas 77030-2707, United States
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5
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Navascués P, Schütz U, Hanselmann B, Hegemann D. Near-Plasma Chemical Surface Engineering. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:195. [PMID: 38251159 PMCID: PMC10819024 DOI: 10.3390/nano14020195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/23/2024]
Abstract
As a new trend in plasma surface engineering, plasma conditions that allow more-defined chemical reactions at the surface are being increasingly investigated. This is achieved by avoiding high energy deposition via ion bombardment during direct plasma exposure (DPE) causing destruction, densification, and a broad variety of chemical reactions. In this work, a novel approach is introduced by placing a polymer mesh with large open area close to the plasma-sheath boundary above the plasma-treated sample, thus enabling near-plasma chemistry (NPC). The mesh size effectively extracts ions, while reactive neutrals, electrons, and photons still reach the sample surface. The beneficial impact of this on the plasma activation of poly (tetrafluoroethylene) (PTFE) to enhance wettability and on the plasma polymerization of siloxanes, combined with the etching of residual hydrocarbons to obtain highly porous SiOx coatings at low temperatures, is discussed. Characterization of the treated samples indicates a predominant chemical modification yielding enhanced film structures and durability.
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Affiliation(s)
- Paula Navascués
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | | | | | - Dirk Hegemann
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
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Mozetič M. Aging of Plasma-Activated Polyethylene and Hydrophobic Recovery of Polyethylene Polymers. Polymers (Basel) 2023; 15:4668. [PMID: 38139920 PMCID: PMC10748196 DOI: 10.3390/polym15244668] [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: 10/24/2023] [Revised: 12/01/2023] [Accepted: 12/03/2023] [Indexed: 12/24/2023] Open
Abstract
Available literature on the aging of plasma-activated polyethylene due to hydrophobic recovery has been reviewed and critically assessed. A common method for the evaluation of hydrophobic recovery is the determination of the static water contact angle, while the surface free energy does not reveal significant correlations. Surface-sensitive methods for the characterization of chemical composition and structure have limited applicability in studying the aging phenomenon. Aging is driven by thermodynamics, so it is observed even upon storage in a vacuum, and hydrophobic recovery increases with increasing temperature. Storage of plasma-activated polyethylene in the air at ambient conditions follows almost logarithmic behavior during the period studied by most authors; i.e., up to one month. The influence of the storage medium is somehow controversial because some authors reported aging suppression by storing in polar liquids, but others reported the loss of hydrophilicity even after a brief immersion into distilled water. Methods for suppressing aging by hydrophobic recovery include plasma treatment at elevated temperature followed by brief treatment at room temperature and application of energetic ions and photons in the vacuum ultraviolet range. Storing at low temperatures is a trivial alternative, but not very practical. The aging of plasma-activated polyethylene suppresses the adhesion of many coatings, but the correlation between the surface free energy and the adhesion force has yet to be addressed adequately.
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Affiliation(s)
- Miran Mozetič
- Department of Surface Engineering, Jozef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia
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Aditya T, Mesa-Restrepo A, Civantos A, Cheng MK, Jaramillo-Correa C, Posada VM, Koyn Z, Allain JP. Ion Bombardment-Induced Nanoarchitectonics on Polyetheretherketone Surfaces for Enhanced Nanoporous Bioactive Implants. ACS APPLIED BIO MATERIALS 2023; 6:4922-4934. [PMID: 37932955 DOI: 10.1021/acsabm.3c00642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
In spite of the biocompatible, nontoxic, and radiolucent properties of polyetheretherketone (PEEK), its biologically inert surface compromises its use in dental, orthopedic, and spine fusion industries. Many efforts have been made to improve the biological performance of PEEK implants, from bioactive coatings to composites using titanium alloys or hydroxyapatite and changing the surface properties by chemical and physical methods. Directed plasma nanosynthesis (DPNS) is an atomic-scale nanomanufacturing technique that changes the surface topography and chemistry of solids via low-energy ion bombardment. In this study, PEEK samples were nanopatterned by using argon ion irradiation by DPNS to yield active nanoporous biomaterial surface. PEEK surfaces modified with two doses of low and high fluence, corresponding to 1.0 × 1017 and 1.0 × 1018 ions/cm2, presented pore sizes of 15-25 and 60-90 nm, respectively, leaving exposed PEEK fibers and an increment of roughness of nearly 8 nm. The pores per unit area were closely related for high fluence PEEK and low fluence PEEK surfaces, with 129.11 and 151.72 pore/μm2, respectively. The contact angle significantly decreases in hydrophobicity-hydrophilicity tests for the irradiated PEEK surface to ∼46° from a control PEEK value of ∼74°. These super hydrophilic substrates had 1.6 times lower contact angle compared to the control sample revealing a rough surface of 20.5 nm only at higher fluences when compared to control and low fluences of 12.16 and 14.03 nm, respectively. These super hydrophilic surfaces in both cases reached higher cell viability with ∼13 and 34% increase, respectively, compared to unmodified PEEK, with an increased expression of alkaline phosphatase at 7 days on higher fluences establishing a higher affinity for preosteblasts with increased cellular activity, thus revealing successful and improved integration with the implant material, which can potentially be used in bone tissue engineering.
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Affiliation(s)
- Teresa Aditya
- The Ken and Mary Alice Lindquist Department of Nuclear Engineering, Pennsylvania State University, State College, Pennsylvania 16802, United States
| | - Andrea Mesa-Restrepo
- Department of Biomedical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Nuclear, Plasma and Radiological Engineering, College of Engineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
- Department of Bioengineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
| | - Ana Civantos
- Department of Nuclear, Plasma and Radiological Engineering, College of Engineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
- Department of Bioengineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
| | - Ming-Kit Cheng
- Department of Nuclear, Plasma and Radiological Engineering, College of Engineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
| | - Camilo Jaramillo-Correa
- The Ken and Mary Alice Lindquist Department of Nuclear Engineering, Pennsylvania State University, State College, Pennsylvania 16802, United States
- Department of Nuclear, Plasma and Radiological Engineering, College of Engineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
| | - Viviana M Posada
- The Ken and Mary Alice Lindquist Department of Nuclear Engineering, Pennsylvania State University, State College, Pennsylvania 16802, United States
| | - Zachariah Koyn
- Editekk, Inc., State College, Pennsylvania 16803, United States
| | - Jean Paul Allain
- The Ken and Mary Alice Lindquist Department of Nuclear Engineering, Pennsylvania State University, State College, Pennsylvania 16802, United States
- Department of Biomedical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Huck Institutes for the Life Sciences, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Nuclear, Plasma and Radiological Engineering, College of Engineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
- Department of Bioengineering, University of Illinois at Urbana─Champaign, Champaign, Illinois 61801-3028, United States
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Nakai M, Saguchi T, Yunaiyama D, Takara Y, Tanaka T, Okada Y, Saito K. Development and Experimental Study of a Polytetrafluoroethylene-Tipped Microcatheter Poorly Adhesive to n-Butyl-2-Cyanoacrylate. J Endovasc Ther 2023:15266028231208652. [PMID: 37906469 DOI: 10.1177/15266028231208652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
PURPOSE We have developed a new microcatheter (designated "NSX") with an outer layer of polytetrafluoroethylene (PTFE) at its tip. We compared the adhesion of the new NSX microcatheter and a conventional microcatheter with n-butyl-2-cyanoacrylate (NBCA) in vitro and in swine blood vessels. MATERIALS AND METHODS The 3 cm tip of the NSX microcatheter is composed of PTFE, which can be identified by double platinum markers. The tips of the NSX and conventional microcatheters were inserted into a vascular model filled with porcine blood with no flow, and NBCA mixed with lipiodol (1:2) was injected from the microcatheters. Two minutes after the injection of NBCA, the microcatheter was withdrawn and the degree of its adhesion to NBCA was evaluated by measuring the resistance value (N) during catheter removal with a digital force gauge. These measurements were repeated with 20 catheters of each type. Similarly, 5 injections were performed with both the NSX and conventional microcatheters in swine vessels. The degree of adhesion of the catheter and blood vessel was evaluated by 2 radiologists under X-ray fluoroscopy on a 3-point scale: 1, no adhesion; 2, mild adhesion; 3, strong adhesion. RESULTS The mean resistance values (N) for the NSX and conventional microcatheters were 0.503±0.186 and 1.051±0.367 (N), respectively (p<0.001). The NSX adhered negligibly to the NBCA and was easily removed, whereas the conventional microcatheter adhered strongly to the NBCA in the blood vessels and was difficult to remove from the swine vessels (p=0.008). CONCLUSIONS The new NSX microcatheter with a PTFE tip exhibits poorer adhesion to NBCA than do conventional microcatheters and allows for safer injection of NBCA than conventional microcatheters, without requiring immediate catheter retrieval. CLINICAL IMPACT The NSX microcatheter with a PTFE tip adheres less strongly to NBCA than do conventional microcatheters and allows the safe injection of NBCA. The NSX microcatheter has double platinum markers on its tip, which make it easy to distinguish the PTFE-covered region. As the NSX does not adhere firmly to the arterial wall, it is less likely to cause vascular injury during removal of the catheter compared with conventional microcatheters, so there is no need to remove the NSX immediately after injecting NBCA. Even operators unfamiliar with NBCA can use NBCA safely with this new NSX microcatheter without requiring special training or skill.
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Affiliation(s)
- Motoki Nakai
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Toru Saguchi
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | | | - Yuki Takara
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Taro Tanaka
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Yukinori Okada
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Kazuhiro Saito
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
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Maggay IV, Liao TY, Venault A, Lin HT, Chao CC, Wei TC, Chang Y. Leveraging the Dielectric Barrier Discharge Plasma Process to Create Regenerative Biocidal ePTFE Membranes. ACS APPLIED MATERIALS & INTERFACES 2023; 15:48001-48014. [PMID: 37787514 DOI: 10.1021/acsami.3c10800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
The utilization of dielectric barrier discharge (DBD) plasma treatment for modifying substrate surfaces constitutes an easy and simple approach with a potential for diverse applications. This technique was used to modify the surface of a commercial porous expanded poly(tetrafluoroethylene) (ePTFE) film with either dimethylaminoethyl methacrylate (DMAEMA) or (trimethylamino)ethyl methacrylate chloride (TMAEMA) monomers, aiming to obtain antibacterial ePTFE. Physicochemical analyses of the membranes revealed that DBD successfully enhanced the surface energy and surface charge of the membranes while maintaining high porosity (>75%) and large pore size (>1.0 μm). Evaluation of the bacteria killing-releasing (K-R) function revealed that both DMAEMA and TMAEMA endowed ePTFE with the ability to kill Escherichia coli bacteria. However, only TMAEMA-grafted ePTFE allowed for the release of dead bacteria from the surface upon washing with sodium hexametaphosphate (SHMP) saline solution, owing to its cationic charge derived from the quaternary amine. Washing with SHMP disturbed the electrostatic force between the polymer brushes and dead bacteria, which caused the release of the dead bacteria. Lastly, dead-end bacteria filtration showed that the TMAEMA-grafted ePTFE was able to kill 99.78% of the bacteria, while approximately 61.55% of bacteria were killed upon contact. The present findings support the feasibility of using DBD plasma treatment for designing surfaces that target bacteria and aid in the containment of disease-causing pathogens.
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Affiliation(s)
- Irish Valerie Maggay
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chungli 32023, Taiwan, R.O.C
| | - Ting-Yu Liao
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chungli 32023, Taiwan, R.O.C
| | - Antoine Venault
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chungli 32023, Taiwan, R.O.C
| | - Hao-Tung Lin
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chungli 32023, Taiwan, R.O.C
| | - Chih-Cheng Chao
- Tasheh Biotec Co., LTD, 226, Yuan-Pei Street, Hsinchu City 300, Taiwan, R.O.C
| | - Ta-Chin Wei
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chungli 32023, Taiwan, R.O.C
| | - Yung Chang
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chungli 32023, Taiwan, R.O.C
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10
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Asrafali SP, Periyasamy T, Kim SC. Rapid Transformation in Wetting Properties of PTFE Membrane Using Plasma Treatment. Polymers (Basel) 2023; 15:3874. [PMID: 37835923 PMCID: PMC10575242 DOI: 10.3390/polym15193874] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 09/15/2023] [Accepted: 09/22/2023] [Indexed: 10/15/2023] Open
Abstract
In this paper, we describe the surface modification of polytetrafluoroethylene (PTFE) through the plasma treatment process. Several parameters including different active gases, RF power, distance between the plasma source and sample, and plasma duration were optimized to reduce the hydrophobic nature of PTFE. Three different active gases were used (i.e., N2, O2, and (Ar+H2)); N2 was effective to reduce the hydrophobicity of PTFE within a shorter plasma duration of 2 min. Several surface characterizations including ATR-FTIR, water contact angle, FE-SEM, and XPS were utilized to verify the neat and modified PTFE surface after plasma treatment. The plasma treatment using N2 as an active gas improved the wettability of the PTFE membrane, showing a water contact angle of 109.5° when compared with the neat PTFE (141.9°). The SEM images of plasma-treated PTFE showed greater modifications on the surface indicating non-uniform fiber alignment and torn fibers at several places. The obtained results confirm the fact that plasma treatment is an effective way to modify the PTFE surface without altering its bulk property.
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Affiliation(s)
| | - Thirukumaran Periyasamy
- Department of Fiber System Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea;
| | - Seong-Cheol Kim
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea;
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11
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Newman G, Leclerc A, Arditi W, Calzuola ST, Feaugas T, Roy E, Perrault CM, Porrini C, Bechelany M. Challenge of material haemocompatibility for microfluidic blood-contacting applications. Front Bioeng Biotechnol 2023; 11:1249753. [PMID: 37662438 PMCID: PMC10469978 DOI: 10.3389/fbioe.2023.1249753] [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: 06/29/2023] [Accepted: 08/07/2023] [Indexed: 09/05/2023] Open
Abstract
Biological applications of microfluidics technology is beginning to expand beyond the original focus of diagnostics, analytics and organ-on-chip devices. There is a growing interest in the development of microfluidic devices for therapeutic treatments, such as extra-corporeal haemodialysis and oxygenation. However, the great potential in this area comes with great challenges. Haemocompatibility of materials has long been a concern for blood-contacting medical devices, and microfluidic devices are no exception. The small channel size, high surface area to volume ratio and dynamic conditions integral to microchannels contribute to the blood-material interactions. This review will begin by describing features of microfluidic technology with a focus on blood-contacting applications. Material haemocompatibility will be discussed in the context of interactions with blood components, from the initial absorption of plasma proteins to the activation of cells and factors, and the contribution of these interactions to the coagulation cascade and thrombogenesis. Reference will be made to the testing requirements for medical devices in contact with blood, set out by International Standards in ISO 10993-4. Finally, we will review the techniques for improving microfluidic channel haemocompatibility through material surface modifications-including bioactive and biopassive coatings-and future directions.
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Affiliation(s)
- Gwenyth Newman
- Department of Medicine and Surgery, Università degli Studi di Milano-Bicocca, Milan, Italy
- Eden Tech, Paris, France
| | - Audrey Leclerc
- Institut Européen des Membranes, IEM, UMR 5635, Univ Montpellier, ENSCM, Centre National de la Recherche Scientifique (CNRS), Place Eugène Bataillon, Montpellier, France
- École Nationale Supérieure des Ingénieurs en Arts Chimiques et Technologiques, Université de Toulouse, Toulouse, France
| | - William Arditi
- Eden Tech, Paris, France
- Centrale Supélec, Gif-sur-Yvette, France
| | - Silvia Tea Calzuola
- Eden Tech, Paris, France
- UMR7648—LadHyx, Ecole Polytechnique, Palaiseau, France
| | - Thomas Feaugas
- Department of Medicine and Surgery, Università degli Studi di Milano-Bicocca, Milan, Italy
- Eden Tech, Paris, France
| | | | | | | | - Mikhael Bechelany
- Institut Européen des Membranes, IEM, UMR 5635, Univ Montpellier, ENSCM, Centre National de la Recherche Scientifique (CNRS), Place Eugène Bataillon, Montpellier, France
- Gulf University for Science and Technology (GUST), Mubarak Al-Abdullah, Kuwait
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12
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Kim KS, Kwak CH, Ha SM, Ryu JC, Lee YS. Effect of Oxyfluorination of PFA-Coated Metal Mesh with Superhydrophobic Properties on the Filtration Performance of SiO2 Microparticles. Molecules 2023; 28:molecules28073110. [PMID: 37049874 PMCID: PMC10095667 DOI: 10.3390/molecules28073110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 03/24/2023] [Accepted: 03/28/2023] [Indexed: 04/03/2023] Open
Abstract
Recently, semiconductor wastewater treatment has received much attention due to the emergence of environmental issues. Acid-resistant coatings are essential for metal prefilters used in semiconductor wastewater treatment. Perfluoroalkoxy alkane is mainly used as an acid-resistant coating agent, since PFA has inherent superhydrophobicity, water permeability is lowered. To solve this problem, the surface of the PFA-coated metal mesh was treated via an oxyfluorination method in which an injected mixed gas of fluorine and oxygen reacted with the surface functional groups. Surface analysis, water contact angle measurement, and water permeability tests were performed on the surface-treated PFA-coated mesh. Consequently, the superhydrophobic surface was effectively converted to a hydrophobic surface as the PFA coating layer was surface-modified with C-O-OH functional groups via the oxyfluorination reaction. As a result of using simulation solutions that float silica particles of various sizes, the permeability and particle removal rate of the surface-modified PFA-coated stainless-steel mesh were improved compared to those before surface modification. Therefore, the oxyfluorination treatment used in this study was suitable for improving the filtration performance of SiO2 microparticles in the PFA-coated stainless-steel mesh.
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Affiliation(s)
- Kyung-Soo Kim
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Cheol-Hwan Kwak
- Carbon Composite Materials Research Center, Gumi Electronics & Information Technology Research Institute, Gumi 39171, Republic of Korea
| | - Seong-Min Ha
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Jae-Chun Ryu
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Young-Seak Lee
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
- Institute of Carbon Fusion Technology (InCFT), Chungnam National University, Daejeon 34134, Republic of Korea
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13
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Zhang S, Liu Y, Lv S, Cheng J, Liao B, Pang P, Chen L, Deng Z, Tian Y, He L. Surface modification of low-background polymers by applying nitrogen ion implantation for electronic substrates of rare event detection. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2022.110700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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14
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Kobayashi M, Nishimura F, Kim JH, Yonezawa S. Dyeable Hydrophilic Surface Modification for PTFE Substrates by Surface Fluorination. MEMBRANES 2023; 13:57. [PMID: 36676864 PMCID: PMC9865303 DOI: 10.3390/membranes13010057] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/25/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
Polytetrafluoroethylene (PTFE) is the most widely used fluoropolymer that has various functionalities such as heat resistance, chemical resistance, abrasion resistance, and non-adhesiveness. However, PTFE is difficult to dye because of its high water repellency. In this study, the PTFE surface was modified by a combination of gold sputtering and surface fluorination to improve dyeability. X-ray photoelectron spectroscopy indicated that, compared with the untreated sample, the gold-sputtered and acid-washed surface of PTFE had a negligible number of C-F terminals. Furthermore, the intensity of the C-C peak increased drastically. The polar groups (C=O and C-Fx) increased after surface fluorination, which enhanced the electronegativity of the surface according to the zeta potential results. Dyeing tests with methylene blue basic dye showed that the dye staining intensity on the surface of fluorinated PTFE samples was superior to other samples. It is due to the increased surface roughness and the negatively charged surface of fluorinated PTFE samples. The modified PTFE substrates may find broad applicability for dyeing, hydrophilic membrane filters, and other adsorption needs.
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Affiliation(s)
- Mizuki Kobayashi
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Fumihiro Nishimura
- Cooperative Research Center, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Jae-Ho Kim
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Susumu Yonezawa
- Cooperative Research Center, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
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15
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Drobota M, Ursache S, Aflori M. Surface Functionalities of Polymers for Biomaterial Applications. Polymers (Basel) 2022; 14:polym14122307. [PMID: 35745883 PMCID: PMC9229900 DOI: 10.3390/polym14122307] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/03/2022] [Accepted: 06/04/2022] [Indexed: 02/04/2023] Open
Abstract
Changes of a material biointerface allow for specialized cell signaling and diverse biological responses. Biomaterials incorporating immobilized bioactive ligands have been widely introduced and used for tissue engineering and regenerative medicine applications in order to develop biomaterials with improved functionality. Furthermore, a variety of physical and chemical techniques have been utilized to improve biomaterial functionality, particularly at the material interface. At the interface level, the interactions between materials and cells are described. The importance of surface features in cell function is then examined, with new strategies for surface modification being highlighted in detail.
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Affiliation(s)
- Mioara Drobota
- “Petru Poni” Institute of Macromolecular Chemistry, 41A Aleea Gr. Ghica Voda, 700487 Iasi, Romania;
| | - Stefan Ursache
- Innovative Green Power, No. 5 Iancu Bacalu Street, 700029 Iasi, Romania;
| | - Magdalena Aflori
- “Petru Poni” Institute of Macromolecular Chemistry, 41A Aleea Gr. Ghica Voda, 700487 Iasi, Romania;
- Correspondence:
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16
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Fazullin DD, Mavrin GV, Shaikhiev IG. Impact of Ultraviolet Irradiation on the Performance Characteristics of Polymeric Microfiltration Membranes. SURFACE ENGINEERING AND APPLIED ELECTROCHEMISTRY 2022. [DOI: 10.3103/s1068375522010021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Tharayil A, Rajakumari R, Mozetic M, Primc G, Thomas S. Contact transmission of SARS-CoV-2 on fomite surfaces: surface survival and risk reduction. Interface Focus 2022; 12:20210042. [PMID: 34956610 PMCID: PMC8662391 DOI: 10.1098/rsfs.2021.0042] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Accepted: 11/02/2021] [Indexed: 12/13/2022] Open
Abstract
There is an unprecedented concern regarding the viral strain SARS-CoV-2 and especially its respiratory disease more commonly known as COVID-19. SARS-CoV-2 virus has the ability to survive on different surfaces for extended periods, ranging from days up to months. The new infectious properties of SARS-CoV-2 vary depending on the properties of fomite surfaces. In this review, we summarize the risk factors involved in the indirect transmission pathways of SARS-CoV-2 strains on fomite surfaces. The main mode of indirect transmission is the contamination of porous and non-porous inanimate surfaces such as textile surfaces that include clothes and most importantly personal protective equipment like personal protective equipment kits, masks, etc. In the second part of the review, we highlight materials and processes that can actively reduce the SARS-CoV-2 surface contamination pattern and the associated transmission routes. The review also focuses on some general methodologies for designing advanced and effective antiviral surfaces by physical and chemical modifications, viral inhibitors, etc.
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Affiliation(s)
- Abhimanyu Tharayil
- School of Energy Materials, Mahatma Gandhi University, Kerala 686560, India
| | - R. Rajakumari
- International and Inter-University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala 686560, India
| | - Miran Mozetic
- Department of Surface Engineering, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
| | - Gregor Primc
- Department of Surface Engineering, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
| | - Sabu Thomas
- School of Energy Materials, Mahatma Gandhi University, Kerala 686560, India
- International and Inter-University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kerala 686560, India
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18
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Fluorinated Ethylene Propylene Coatings Deposited by a Spray Process: Mechanical Properties, Scratch and Wear Behavior. Polymers (Basel) 2022; 14:polym14020347. [PMID: 35054753 PMCID: PMC8780176 DOI: 10.3390/polym14020347] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 01/12/2022] [Accepted: 01/14/2022] [Indexed: 02/04/2023] Open
Abstract
To increase the lifetime of metallic molds and protect their surface from wear, a fluorinated ethylene propylene (FEP) polymer was coated onto a stainless-steel (SS304) substrate, using an air spray process followed by a heat treatment. The microstructural properties of the coating were studied using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) as well as X-ray diffraction. The mechanical properties and adhesion behavior were analyzed via a nanoindentation test and progressive scratching. According to the results, the FEP coating had a smooth and dense microstructure. The mechanical properties of the coatings, i.e., the hardness and Young’s modulus, were 57 ± 2.35 and 1.56 ± 0.07 GPa, respectively. During scratching, successive delamination stages (initiation, expansion, and propagation) were noticed, and the measured critical loads LC1 (3.36 N), LC2 (6.2 N), and LC3 (7.6 N) indicated a high adhesion of the FEP coating to SS304. The detailed wear behavior and related damage mechanisms of the FEP coating were investigated employing a multi-pass scratch test and SEM in various sliding conditions. It was found that the wear volume increased with an increase in applied load and sliding velocity. Moreover, the FEP coating revealed a low friction coefficient (around 0.13) and a low wear coefficient (3.1 × 10−4 mm3 N m−1). The investigation of the damage mechanisms of the FEP coating showed a viscoelastic plastic deformation related to FEP ductility. Finally, the coating’s resistance to corrosion was examined using electrochemical measurements in a 3.5 wt% NaCl solution. The coating was found to provide satisfactory corrosion protection to the SS304 substrate, as no corrosion was observed after 60 days of immersion.
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19
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Zhang G, Chen Y, Sui X, Kang M, Feng Y, Yin H. Nonionic surfactant stabilized polytetrafluoroethylene dispersion: Effect of molecular structure and topology. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.116988] [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]
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20
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Ohkubo Y, Okazaki Y, Nishino M, Seto Y, Endo K, Yamamura K. Flexible selection of the functional-group ratio on a polytetrafluoroethylene (PTFE) surface using a single-gas plasma treatment. RSC Adv 2022; 12:31246-31254. [DOI: 10.1039/d2ra04763b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 10/21/2022] [Indexed: 11/07/2022] Open
Abstract
During plasma treatment of polymers, etching occurs and functional groups are introduced on their surface.
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Affiliation(s)
- Yuji Ohkubo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yuki Okazaki
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Misa Nishino
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yosuke Seto
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Katsuyoshi Endo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kazuya Yamamura
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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21
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Vesel A, Zaplotnik R, Primc G, Mozetič M, Katan T, Kargl R, Mohan T, Kleinschek KS. Rapid Functionalization of Polytetrafluorethylene (PTFE) Surfaces with Nitrogen Functional Groups. Polymers (Basel) 2021; 13:4301. [PMID: 34960856 PMCID: PMC8708819 DOI: 10.3390/polym13244301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/03/2021] [Accepted: 12/06/2021] [Indexed: 11/16/2022] Open
Abstract
The biocompatibility of body implants made from polytetrafluoroethylene (PTFE) is inadequate; therefore, the surface should be grafted with biocompatible molecules. Because PTFE is an inert polymer, the adhesion of the biocompatible film may not be appropriate. Therefore, the PFTE surface should be modified to enable better adhesion, preferably by functionalization with amino groups. A two-step process for functionalization of PTFE surface is described. The first step employs inductively coupled hydrogen plasma in the H-mode and the second ammonia plasma. The evolution of functional groups upon treatment with ammonia plasma in different modes is presented. The surface is saturated with nitrogen groups within a second if ammonia plasma is sustained in the H-mode at the pressure of 35 Pa and forward power of 200 W. The nitrogen-rich surface film persists for several seconds, while prolonged treatment causes etching. The etching is suppressed but not eliminated using pulsed ammonia plasma at 35 Pa and 200 W. Ammonia plasma in the E-mode at the same pressure, but forward power of 25 W, causes more gradual functionalization and etching was not observed even at prolonged treatments up to 100 s. Detailed investigation of the XPS spectra enabled revealing the surface kinetics for all three cases.
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Affiliation(s)
- Alenka Vesel
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Rok Zaplotnik
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Gregor Primc
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Miran Mozetič
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Tadeja Katan
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Rupert Kargl
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Tamilselvan Mohan
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Karin Stana Kleinschek
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
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22
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Ohkubo Y, Okazaki Y, Shibahara M, Nishino M, Seto Y, Endo K, Yamamura K. Effects of He and Ar Heat-Assisted Plasma Treatments on the Adhesion Properties of Polytetrafluoroethylene (PTFE). Polymers (Basel) 2021; 13:4266. [PMID: 34883768 PMCID: PMC8659427 DOI: 10.3390/polym13234266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/27/2021] [Accepted: 12/03/2021] [Indexed: 11/16/2022] Open
Abstract
Heat-assisted plasma (HAP) treatment using He gas is known to improve the adhesive-bonding and adhesive-free adhesion properties of polytetrafluoroethylene (PTFE). In this study, we investigated the effects of He and Ar gaseous species on the HAP-treated PTFE surface. Epoxy (EP) adhesive-coated stainless steel (SUS304) and isobutylene-isoprene rubber (IIR) were used as adherents for the evaluation of the adhesive-bonding and adhesive-free adhesion properties of PTFE. In the case of adhesive bonding, the PTFE/EP-adhesive/SUS304 adhesion strength of the Ar-HAP-treated PTFE was the same as that of the He-HAP-treated PTFE. In the case of adhesive-free adhesion, the PTFE/IIR adhesion strength of the Ar-HAP-treated PTFE was seven times lower than that of the He-HAP-treated PTFE. The relation among gaseous species used in HAP treatment, adhesion properties, peroxy radical density ratio, surface chemical composition, surface modification depth, surface morphology, surface hardness, and the effect of irradiation with vacuum ultraviolet (VUV) and UV photons were investigated. The different adhesive-free adhesion properties obtained by the two treatments resulted from the changes in surface chemical composition, especially the ratios of oxygen-containing functional groups and C-C crosslinks.
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Affiliation(s)
- Yuji Ohkubo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan; (Y.O.); (M.N.); (Y.S.); (K.E.); (K.Y.)
| | - Yuki Okazaki
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan; (Y.O.); (M.N.); (Y.S.); (K.E.); (K.Y.)
| | - Masafumi Shibahara
- Materials and Analysis Department, Hyogo Prefectural Institute of Technology, 3-1-12 Yukihiracho, Kobe 654-0037, Japan;
| | - Misa Nishino
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan; (Y.O.); (M.N.); (Y.S.); (K.E.); (K.Y.)
| | - Yosuke Seto
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan; (Y.O.); (M.N.); (Y.S.); (K.E.); (K.Y.)
| | - Katsuyoshi Endo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan; (Y.O.); (M.N.); (Y.S.); (K.E.); (K.Y.)
| | - Kazuya Yamamura
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan; (Y.O.); (M.N.); (Y.S.); (K.E.); (K.Y.)
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23
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Non-Equilibrium Plasma Methods for Tailoring Surface Properties of Polyvinylidene Fluoride: Review and Challenges. Polymers (Basel) 2021; 13:polym13234243. [PMID: 34883744 PMCID: PMC8659518 DOI: 10.3390/polym13234243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 12/01/2022] Open
Abstract
Modification and functionalization of polymer surface properties is desired in numerous applications, and a standard technique is a treatment with non-equilibrium gaseous plasma. Fluorinated polymers exhibit specific properties and are regarded as difficult to functionalize with polar functional groups. Plasma methods for functionalization of polyvinylidene fluoride (PVDF) are reviewed and different mechanisms involved in the surface modification are presented and explained by the interaction of various reactive species and far ultraviolet radiation. Most authors used argon plasma but reported various results. The discrepancy between the reported results is explained by peculiarities of the experimental systems and illustrated by three mechanisms. More versatile reaction mechanisms were reported by authors who used oxygen plasma for surface modification of PVDF, while plasma sustained in other gases was rarely used. The results reported by various authors are analyzed, and correlations are drawn where feasible. The processing parameters reported by different authors were the gas pressure and purity, the discharge configuration and power, while the surface finish was predominantly determined by X-ray photoelectron spectroscopy (XPS) and static water contact angle (WCA). A reasonably good correlation was found between the surface wettability as probed by WCA and the oxygen concentration as probed by XPS, but there is hardly any correlation between the discharge parameters and the wettability.
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24
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Turkoglu Sasmazel H, Alazzawi M, Kadim Abid Alsahib N. Atmospheric Pressure Plasma Surface Treatment of Polymers and Influence on Cell Cultivation. Molecules 2021; 26:molecules26061665. [PMID: 33802663 PMCID: PMC8002466 DOI: 10.3390/molecules26061665] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/04/2021] [Accepted: 03/06/2021] [Indexed: 12/31/2022] Open
Abstract
Atmospheric plasma treatment is an effective and economical surface treatment technique. The main advantage of this technique is that the bulk properties of the material remain unchanged while the surface properties and biocompatibility are enhanced. Polymers are used in many biomedical applications; such as implants, because of their variable bulk properties. On the other hand, their surface properties are inadequate which demands certain surface treatments including atmospheric pressure plasma treatment. In biomedical applications, surface treatment is important to promote good cell adhesion, proliferation, and growth. This article aim is to give an overview of different atmospheric pressure plasma treatments of polymer surface, and their influence on cell-material interaction with different cell lines.
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Affiliation(s)
- Hilal Turkoglu Sasmazel
- Department of Metallurgical and Materials Engineering, Atilim University, Incek, Golbasi, 06830 Ankara, Turkey
- Correspondence: ; Tel.: +90-(312)-586-8844
| | - Marwa Alazzawi
- Department of Biomedical Engineering, Al Nahrain University, Al Jadriya Bridge, Baghdad 64074, Iraq; (M.A.); (N.K.A.A.)
| | - Nabeel Kadim Abid Alsahib
- Department of Biomedical Engineering, Al Nahrain University, Al Jadriya Bridge, Baghdad 64074, Iraq; (M.A.); (N.K.A.A.)
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25
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Defluorination of Polytetrafluoroethylene Surface by Hydrogen Plasma. Polymers (Basel) 2020; 12:polym12122855. [PMID: 33260483 PMCID: PMC7760809 DOI: 10.3390/polym12122855] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 11/25/2020] [Accepted: 11/27/2020] [Indexed: 11/30/2022] Open
Abstract
Defluorination of polytetrafluoroethylene (PTFE) surface film is a suitable technique for tailoring its surface properties. The influence of discharge parameters on the surface chemistry was investigated systematically using radio-frequency inductively coupled H2 plasma sustained in the E- and H-modes at various powers, pressures and treatment times. The surface finish was probed by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The measurements of water contact angles (WCA) showed increased wettability of the pristine PTFE; however, they did not reveal remarkable modification in the surface chemistry of the samples treated at various discharge parameters. By contrast, the combination of XPS and ToF-SIMS, however, revealed important differences in the surface chemistry between the E- and H-modes. A well-expressed minimum in the fluorine to carbon ratio F/C as low as 0.2 was observed at the treatment time as short as 1 s when plasma was in the H-mode. More gradual surface chemistry was observed when plasma was in the E-mode, and the minimal achievable F/C ratio was about 0.6. The results were explained by the synergistic effects of hydrogen atoms and vacuum ultraviolet radiation.
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26
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Abstract
Surface chemistry plays a key role in modern applications of polymer materials [...]
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