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Chen P, Lang J, Franklin T, Yu Z, Yang R. Reduced Biofilm Formation at the Air-Liquid-Solid Interface via Introduction of Surfactants. ACS Biomater Sci Eng 2021. [PMID: 33821617 DOI: 10.1021/acsbiomaterials.0c01691] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Reduced biofilm formation is highly desirable in applications ranging from transportation to separations and healthcare. Biofilms often form at the three-phase interface where air, liquid, and solid coexist due to the close proximity to nutrients and oxygen. Reducing biofilm formation at the triple interface presents challenges because of the conflicting requirements for hydrophobicity at the air-solid interface (for self-cleaning properties) and for hydrophilicity at the liquid-solid interface (for reduced foulant adhesion). Meeting those needs simultaneously likely entails a dynamic surface, capable of shifting the surface energy landscape in response to wetting conditions and thus enabling hydrophobicity in air and hydrophilicity in water. Here, we designed a facile approach to render existing surfaces resistant to biofilm formation at the triple interface. By adding trace amounts (∼0.1 mM) of surfactants, biofilm formation of Pseudomonas aeruginosa (known to form biofilm at the triple interface) was reduced on all surfaces tested, ranging from hydrophilic to hydrophobic, polar to nonpolar. That reduced fouling was not a result of the known antimicrobial effects. Instead, it was attributed to the surface-adsorbed surfactants that dynamically control surface energy at the triple interface. To further understand the effect of surfactant-surface interactions on biofilm reduction, we systematically varied the surfactant charge type and surface properties (surface energy and charge). Electrostatic interactions between surfactants and surfaces were identified as an influential factor when predicting the relative fouling reduction upon introduction of surfactants. Nevertheless, biofilm formation was reduced even on the charge-neutral, fluorinated surface made of poly(1H, 1H, 2H, 2H-perfluorodecyl acrylate) by more than 2-fold simply via adding 0.2 mM dodecyl trimethylammonium chloride or 0.3 mM sodium dodecyl sulfate. Given its robustness, this strategy is broadly applicable for reducing fouling on existing surfaces, which in turn improves the cost-effectiveness of membrane separations and mitigates contaminations and nosocomial infections in healthcare.
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Affiliation(s)
- Pengyu Chen
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Jiayan Lang
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Trevor Franklin
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Zichen Yu
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Rong Yang
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
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Schönemann E, Koc J, Aldred N, Clare AS, Laschewsky A, Rosenhahn A, Wischerhoff E. Synthesis of Novel Sulfobetaine Polymers with Differing Dipole Orientations in Their Side Chains, and Their Effects on the Antifouling Properties. Macromol Rapid Commun 2019; 41:e1900447. [DOI: 10.1002/marc.201900447] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 10/29/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Eric Schönemann
- Department of Chemistry Universität Potsdam Karl‐Liebknecht‐Str. 24‐25 14476 Potsdam‐Golm Germany
| | - Julian Koc
- Analytical Chemistry ‐ Biointerfaces Ruhr University Bochum 44780 Bochum Germany
| | - Nick Aldred
- School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - Anthony S. Clare
- School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - André Laschewsky
- Department of Chemistry Universität Potsdam Karl‐Liebknecht‐Str. 24‐25 14476 Potsdam‐Golm Germany
- Fraunhofer Institute of Applied Polymer Research IAP Geiselbergstr. 69 14476 Potsdam‐Golm Germany
| | - Axel Rosenhahn
- Analytical Chemistry ‐ Biointerfaces Ruhr University Bochum 44780 Bochum Germany
| | - Erik Wischerhoff
- Fraunhofer Institute of Applied Polymer Research IAP 14476 Potsdam‐Golm Germany
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Wang M, Kovacik P, Gleason KK. Chemical Vapor Deposition of Thin, Conductive, and Fouling-Resistant Polymeric Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10623-10631. [PMID: 28933863 DOI: 10.1021/acs.langmuir.7b02646] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Fouling has been a persistent issue within applications ranging from membrane separation to biomedical implantation. Research to date focuses on fouling-resistant coatings, where electrical conductivity is unnecessary. In this study, we report the synthesis of multifunctional thin films with both fouling resistance and electrical conductivity for their potential applications in the electrolysis-based self-cleaning of separation membranes and in the field of bioelectronics. This unique combination of properties results in multifunctional coatings that are a zwitterionic derivative of intrinsically conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) synthesized via oxidative chemical vapor deposition (oCVD). Their fouling resistance is shown to be comparable to that of known dielectric fouling-resistant surfaces, such as a poly(4-vinylpyridine)-co-divinylbenzene (p4VP-DVB)-derived zwitterionic coating, an amphiphilic poly(1H,1H,2H,2H-perfluorodecyl acrylate-co-2-hydroxyethyl methacrylate) (pPFDA-HEMA) coating, and a glass surface, and are far superior to the fouling resistance of gold or polydimethylsiloxane (PDMS) surfaces. The fouling resistances of seven surfaces are quantitatively characterized by molecular force probe (MFP) analysis. In addition, four-point probe electrical measurements, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), variable-angle spectroscopic ellipsometry (VASE), profilometry, water contact angle (WCA) measurements, surface ζ-potential measurements, and atomic force microscopy (AFM) were employed to characterize the physiochemical properties and morphology of the different surfaces.
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Affiliation(s)
- Minghui Wang
- Department of Chemical Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Peter Kovacik
- Department of Chemical Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Karen K Gleason
- Department of Chemical Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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Tazreiter M, Christian P, Schennach R, Grießer T, Coclite AM. Simple method for the quantitative analysis of thin copolymer films on substrates by infrared spectroscopy using direct calibration. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2017; 9:5266-5273. [PMID: 31497074 PMCID: PMC6688560 DOI: 10.1039/c7ay01748k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 08/18/2017] [Indexed: 06/10/2023]
Abstract
The chemical composition of a copolymer drives many important material properties and quantification in terms of comonomer volume fraction is thus of practical relevance for many studies. Infrared spectroscopy is one of the most common techniques for compositional analysis but it usually relies on manual evaluation of baselines and peak heights, which can be rather inaccurate and become a laborious task when having multiple spectra to evaluate. On the contrary, Maxwell's theory of electrodynamics can be used to calculate the complex index of refraction from measured spectra promising a more accurate quantification. Since this procedure is rather involved, we propose a simple in-house developed IR-quantification routine to automatically evaluate the comonomer volume fractions of thin copolymer films by using the Bouguer-Lambert-Beer approximation after correcting the baseline of all absorbance spectra automatically. This method was experimentally evaluated on over 40 thin polymeric coatings synthesized by initiated chemical vapor deposition on silicon substrates. The samples comprised a wide range of different compositions and were synthesized from four different monomers, with single films consisting of up to three components. All data obtained by our routine was compared with data from spectroscopic ellipsometry and with X-ray photoelectron spectroscopy data of selected samples. The comparisons show that the IR-quantification routine reliably evaluated the polymer composition even when the involved comonomers exhibited similar chemistry, as it is the case for methacrylic acid cross-linked with ethylene glycol dimethacrylate.
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Affiliation(s)
- Martin Tazreiter
- Institute of Solid State Physics , NAWI Graz , Graz University of Technology , 8010 Graz , Austria .
| | - Paul Christian
- Institute of Solid State Physics , NAWI Graz , Graz University of Technology , 8010 Graz , Austria .
| | - Robert Schennach
- Institute of Solid State Physics , NAWI Graz , Graz University of Technology , 8010 Graz , Austria .
| | - Thomas Grießer
- Department Kunststofftechnik , Montanuniversität Leoben , 8700 Leoben , Austria
| | - Anna Maria Coclite
- Institute of Solid State Physics , NAWI Graz , Graz University of Technology , 8010 Graz , Austria .
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Chen N, Kim DH, Kovacik P, Sojoudi H, Wang M, Gleason KK. Polymer Thin Films and Surface Modification by Chemical Vapor Deposition: Recent Progress. Annu Rev Chem Biomol Eng 2017; 7:373-93. [PMID: 27276550 DOI: 10.1146/annurev-chembioeng-080615-033524] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Chemical vapor deposition (CVD) polymerization uses vapor phase monomeric reactants to synthesize organic thin films directly on substrates. These thin films are desirable as conformal surface engineering materials and functional layers. The facile tunability of the films and their surface properties allow successful integration of CVD thin films into prototypes for applications in surface modification, device fabrication, and protective films. CVD polymers also bridge microfabrication technology with chemical and biological systems. Robust coatings can be achieved via CVD methods as antifouling, anti-icing, and antihydrate surfaces, as well as stimuli-responsive or biocompatible polymers and novel nanostructures. Use of low-energy input, modest vacuum, and room-temperature substrates renders CVD polymerization compatible with thermally sensitive substrates and devices. Compared with solution-based methods, CVD is particularly useful for insoluble materials, such as electrically conductive polymers and controllably crosslinked networks, and has the potential to reduce environmental, health, and safety impacts associated with solvents. This review discusses the relevant background and selected applications of recent advances by two methods that display and use the high retention of the organic functional groups from their respective monomers, initiated CVD (iCVD) and oxidative CVD (oCVD) polymerization.
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Affiliation(s)
- Nan Chen
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;
| | - Do Han Kim
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;
| | - Peter Kovacik
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;
| | - Hossein Sojoudi
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; .,Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Minghui Wang
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;
| | - Karen K Gleason
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;
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Wang M, Wang X, Moni P, Liu A, Kim DH, Jo WJ, Sojoudi H, Gleason KK. CVD Polymers for Devices and Device Fabrication. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1604606. [PMID: 28032923 PMCID: PMC7161753 DOI: 10.1002/adma.201604606] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 10/20/2016] [Indexed: 05/19/2023]
Abstract
Chemical vapor deposition (CVD) polymerization directly synthesizes organic thin films on a substrate from vapor phase reactants. Dielectric, semiconducting, electrically conducting, and ionically conducting CVD polymers have all been readily integrated into devices. The absence of solvent in the CVD process enables the growth of high-purity layers and avoids the potential of dewetting phenomena, which lead to pinhole defects. By limiting contaminants and defects, ultrathin (<10 nm) CVD polymeric device layers have been fabricated in multiple laboratories. The CVD method is particularly suitable for synthesizing insoluble conductive polymers, layers with high densities of organic functional groups, and robust crosslinked networks. Additionally, CVD polymers are prized for the ability to conformally cover rough surfaces, like those of paper and textile substrates, as well as the complex geometries of micro- and nanostructured devices. By employing low processing temperatures, CVD polymerization avoids damaging substrates and underlying device layers. This report discusses the mechanisms of the major CVD polymerization techniques and the recent progress of their applications in devices and device fabrication, with emphasis on initiated CVD (iCVD) and oxidative CVD (oCVD) polymerization.
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Affiliation(s)
- Minghui Wang
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Xiaoxue Wang
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Priya Moni
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Andong Liu
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Do Han Kim
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Won Jun Jo
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
| | - Hossein Sojoudi
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
- Department of MechanicalIndustrial & Manufacturing EngineeringThe University of ToledoToledoOhio43606USA
| | - Karen K. Gleason
- Department of Chemical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA02139USA
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Sojoudi H, Wang M, Boscher ND, McKinley GH, Gleason KK. Durable and scalable icephobic surfaces: similarities and distinctions from superhydrophobic surfaces. SOFT MATTER 2016; 12:1938-1963. [PMID: 26757856 DOI: 10.1039/c5sm02295a] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Formation, adhesion, and accumulation of ice, snow, frost, glaze, rime, or their mixtures can cause severe problems for solar panels, wind turbines, aircrafts, heat pumps, power lines, telecommunication equipment, and submarines. These problems can decrease efficiency in power generation, increase energy consumption, result in mechanical and/or electrical failure, and generate safety hazards. To address these issues, the fundamentals of interfaces between liquids and surfaces at low temperatures have been extensively studied. This has lead to development of so called "icephobic" surfaces, which possess a number of overlapping, yet distinctive, characteristics from superhydrophobic surfaces. Less attention has been given to distinguishing differences between formation and adhesion of ice, snow, glaze, rime, and frost or to developing a clear definition for icephobic, or more correctly pagophobic, surfaces. In this review, we strive to clarify these differences and distinctions, while providing a comprehensive definition of icephobicity. We classify different canonical families of icephobic (pagophobic) surfaces providing a review of those with potential for scalable and robust development.
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Affiliation(s)
- H Sojoudi
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
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Yang R, Goktekin E, Gleason KK. Zwitterionic Antifouling Coatings for the Purification of High-Salinity Shale Gas Produced Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11895-903. [PMID: 26449686 DOI: 10.1021/acs.langmuir.5b02795] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Fouling refers to the undesirable attachment of organic molecules and microorganisms to submerged surfaces. It is an obstacle to the purification of shale gas produced water and is currently without an effective solution due to the highly contaminated nature of produced water. Here, we demonstrate the direct vapor application of a robust zwitterionic coating to a variety of substrates. The coating remains unprecedentedly hydrophilic, smooth, and effectively antifouling in extremely high salinity solutions (with salt concentration of 200,000 ppm). The fouling resistance is assessed rapidly and quantitatively with a molecular force spectroscopy-based method and corroborated using quartz crystal microbalance system with dissipation monitoring. Grazing angle attenuated total reflectance Fourier transform infrared is used in combination with X-ray photoelectron spectroscopy, atomic force microscope, and in situ spectroscopic ellipsometry to lend insight into the underlying mechanism for the exceptional stability and effectiveness of the zwitterionic coating under high-salinity conditions. A unique coating architecture, where the surface is concentrated with mobile zwitterionic moieties while the bulk is cross-linked to enhance coating durability, was discovered to be the origin of its stable fouling resistance under high salinity. Combined with previously reported exceptional stability in highly oxidative environments and strong fouling resistance to oil and grease, the zwitterionic surface here has the potential to enable low-cost, membrane-based techniques for the purification of produced water and to eventually balance the favorable economics and the concerning environmental impacts of the hydraulic fracturing industry.
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Affiliation(s)
- Rong Yang
- Department of Chemical Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Esma Goktekin
- Department of Chemical Engineering, Northeastern University , Boston, Massachusetts 02115, United States
| | - Karen K Gleason
- Department of Chemical Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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