1
|
Cho W, Flagg LQ, Hoffman JR, Burnett D, Kondor A, Fox DM, Stafford CM, Woodcock JW. New Method to Probe the Surface Properties of Polymer Thin Films by Two-Dimensional (2D) Inverse Gas Chromatography (iGC). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:14037-14044. [PMID: 38917337 DOI: 10.1021/acs.langmuir.4c01400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
Polymer-based functional surface coatings are extensively used in advanced technologies, including optics, energy, and environmental applications. Surface thermodynamic properties profoundly impact the molecular interactions that control interfacial behaviors, such as adhesion and wettability, which in turn dictate coating processes and performance. Conventionally, contact angle measurements are used to assess the surface energy of polymer films and coatings, where the wettability of a surface is assessed using probe fluids (liquid drops). However, contact angle measurement oftentimes can be nontrivial due to the roughness or chemical heterogeneity of the solid surface, as well as the potential for the liquid drop to swell or even dissolve the material being measured. Alternatively, inverse gas chromatography (iGC) is a versatile technique to measure surface thermodynamics and Lewis acid-base properties while also providing environmental control such as temperature and humidity. Despite these benefits, the application of iGC has been limited to powders or fibers, while the direct measurement of supported thin films or coatings is still a nascent area of research. This creates a challenge when using iGC as a comprehensive platform for measuring the physicochemical properties of solid surfaces. Here, we demonstrate how to effectively use iGC to characterize the surface energy of supported polymer thin films by using a two-dimensional (2D) film holder and modifying operational controls, such as the concentration range of the injected gas probe molecules. This enables the precise control of surface coverage required for analyzing samples having minimal surface area, such as thin films. Poly(methyl methacrylate) (PMMA) was employed as a benchmark to determine suitable iGC parameters and to validate our approach on polymer thin films. The seminal work presented here expands the capability of state-of-the-art iGC to embrace supported thin films (2D iGC) that could either be smooth or display texture/roughness (patterned films) as well as coatings with heterogeneous chemical/structural composition.
Collapse
Affiliation(s)
- Whirang Cho
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Chemistry, American University, Washington, D.C. 20016, United States
| | - Lucas Q Flagg
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - John R Hoffman
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Daniel Burnett
- Surface Measurement Systems, Allentown, Pennsylvania 18103, United States
| | - Anett Kondor
- Surface Measurement Systems, Allentown, Pennsylvania 18103, United States
| | - Douglas M Fox
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Chemistry, American University, Washington, D.C. 20016, United States
| | - Christopher M Stafford
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Jeremiah W Woodcock
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| |
Collapse
|
2
|
Ozbay S, Korkut I, Erden F. The relationships between surface and electrical properties of CSA doped PANI films. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
|
3
|
Flejszar M, Ślusarczyk K, Chmielarz P, Smenda J, Wolski K, Wytrwal-Sarna M, Oszajca M. SI-ATRP on the lab bench: A facile recipe for oxygen-tolerant PDMAEMA brushes synthesis using microliter volumes of reagents. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
4
|
Han H, Yin W, Yang B, Wang D, Yao J, Zhu Z. Adsorption behavior of sodium oleate on iron minerals and its effect on flotation kinetics. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
5
|
Ameliorating properties of castor oil based polyurethane hybrid nanocomposites via synergistic addition of graphene and cellulose nanofibers. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.02.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
6
|
Tamay DG, Gokyer S, Schmidt J, Vladescu A, Yilgor Huri P, Hasirci V, Hasirci N. Corrosion Resistance and Cytocompatibility of Magnesium-Calcium Alloys Modified with Zinc- or Gallium-Doped Calcium Phosphate Coatings. ACS APPLIED MATERIALS & INTERFACES 2022; 14:104-122. [PMID: 34958199 DOI: 10.1021/acsami.1c16307] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In orthopedic surgery, metals are preferred to support or treat damaged bones due to their high mechanical strength. However, the necessity for a second surgery for implant removal after healing creates problems. Therefore, biodegradable metals, especially magnesium (Mg), gained importance, although their extreme susceptibility to galvanic corrosion limits their applications. The focus of this study was to control the corrosion of Mg and enhance its biocompatibility. For this purpose, surfaces of magnesium-calcium (MgCa1) alloys were modified with calcium phosphate (CaP) or CaP doped with zinc (Zn) or gallium (Ga) via microarc oxidation. The effects of surface modifications on physical, chemical, and mechanical properties and corrosion resistance of the alloys were studied using surface profilometry, goniometry, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), nanoindentation, and electrochemical impedance spectroscopy (EIS). The coating thickness was about 5-8 μm, with grain sizes of 43.1 nm for CaP coating and 28.2 and 58.1 nm for Zn- and Ga-doped coatings, respectively. According to EIS measurements, the capacitive response (Yc) decreased from 11.29 to 8.72 and 0.15 Ω-1 cm-2 sn upon doping with Zn and Ga, respectively. The Ecorr value, which was -1933 mV for CaP-coated samples, was found significantly electropositive at -275 mV for Ga-doped ones. All samples were cytocompatible according to indirect tests. In vitro culture with Saos-2 cells led to changes in the surface compositions of the alloys. The numbers of cells attached to the Zn-doped (2.6 × 104 cells/cm2) and Ga-doped (6.3 × 104 cells/cm2) coatings were higher than that on the surface of the undoped coating (1.0 × 103 cells/cm2). Decreased corrosivity and enhanced cell affinity of the modified MgCa alloys (CaP coated and Zn and Ga doped, with Ga-doped ones having the greatest positive effect) make them novel and promising candidates as biodegradable metallic implant materials for the treatment of bone damages and other orthopedic applications.
Collapse
Affiliation(s)
- Dilara Goksu Tamay
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara 06800, Turkey
- Department of Biotechnology, Middle East Technical University (METU), Ankara 06800, Turkey
| | - Seyda Gokyer
- Department of Biomedical Engineering, Ankara University, Ankara 06830, Turkey
| | - Jürgen Schmidt
- Team Leader Electrochemistry, INNOVENT e.V. Technology Development, Prüssingstraße 27b, Jena 07745, Germany
| | - Alina Vladescu
- National Institute of Research and Development for Optoelectronics - INOE 2000, 409 Atomistilor St., Magurele 077125, Romania
- Physical Materials Science and Composite Materials Centre, Research School of Chemistry and Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Avenue 43, Tomsk 634050, Russia
| | - Pinar Yilgor Huri
- Department of Biomedical Engineering, Ankara University, Ankara 06830, Turkey
| | - Vasif Hasirci
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara 06800, Turkey
- Department of Medical Engineering, Acibadem Mehmet Ali Aydinlar University, Istanbul 34684, Turkey
- Biomaterials Center, Acibadem Mehmet Ali Aydinlar University, Istanbul 34684, Turkey
| | - Nesrin Hasirci
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University (METU), Ankara 06800, Turkey
- Department of Biotechnology, Middle East Technical University (METU), Ankara 06800, Turkey
- Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
- Tissue Engineering and Biomaterial Research Center, Near East University, 99138 Nicosia, TRNC, Mersin 10, Turkey
| |
Collapse
|
7
|
Ozbay S. Evaluation of polyphenylene sulfide by surface thermodynamics approaches: Comparison with common polymers. J Appl Polym Sci 2021. [DOI: 10.1002/app.52082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Salih Ozbay
- Department of Chemical Engineering Sivas University of Science and Technology Sivas Turkey
| |
Collapse
|
8
|
Ayre WN, Scully N, Elford C, Evans BA, Rowe W, Rowlands J, Mitha R, Malpas P, Manti P, Holt C, Morgan-Jones R, Birchall JC, Denyer SP, Evans SL. Alternative radiopacifiers for polymethyl methacrylate bone cements: Silane-treated anatase titanium dioxide and yttria-stabilised zirconium dioxide. J Biomater Appl 2021; 35:1235-1252. [PMID: 33573445 PMCID: PMC8058833 DOI: 10.1177/0885328220983797] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Poly (methyl methacrylate) (PMMA) bone cement is widely used for anchoring joint arthroplasties. In cement brands approved for these procedures, micron-sized particles (usually barium sulphate, BaSO4) act as the radiopacifier. It has been postulated that these particles act as sites for crack initiation and subsequently cement fatigue. This study investigated whether alternative radiopacifiers, anatase titanium dioxide (TiO2) and yttria-stabilised zirconium dioxide (ZrO2), could improve the in vitro mechanical, fatigue crack propagation and biological properties of polymethyl methacrylate (PMMA) bone cement and whether their coating with a silane could further enhance cement performance. Cement samples containing 0, 5, 10, 15, 20 and 25%w/w TiO2 or ZrO2 and 10%w/w silane-treated TiO2 or ZrO2 were prepared and characterised in vitro in terms of radiopacity, compressive and bending strength, bending modulus, fatigue crack propagation, hydroxyapatite forming ability and MC3T3-E1 cell attachment and viability. Cement samples with greater than 10%w/w TiO2 and ZrO2 had a similar radiopacity to the control 10%w/w BaSO4 cement and commercial products. The addition of TiO2 and ZrO2 to bone cement reduced the bending strength and fracture toughness and increased fatigue crack propagation due to the formation of agglomerations and voids. Silane treating TiO2 reversed this effect, enhancing the dispersion and adhesion of particles to the PMMA matrix and resulted in improved mechanical properties and fatigue crack propagation resistance. Silane-treated TiO2 cements had increased nucleation of hydroxyapatite and MC3T3-E1 cell attachment in vitro, without significantly compromising cell viability. This research has demonstrated that 10%w/w silane-treated anatase TiO2 is a promising alternative radiopacifier for PMMA bone cement offering additional benefits over conventional BaSO4 radiopacifiers.
Collapse
Affiliation(s)
| | | | | | | | - Wendy Rowe
- School of Dentistry, Cardiff University, Cardiff, UK
| | - Jeff Rowlands
- School of Engineering, Cardiff University, Cardiff, UK
| | - Ravi Mitha
- School of Engineering, Cardiff University, Cardiff, UK
| | - Paul Malpas
- School of Engineering, Cardiff University, Cardiff, UK
| | | | - Cathy Holt
- School of Engineering, Cardiff University, Cardiff, UK
| | - Rhidian Morgan-Jones
- Department of Trauma & Orthopaedics, Cardiff & Vale University Health Board, Cardiff, UK
| | - James C Birchall
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Cardiff, UK
| | - Stephen P Denyer
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, UK
| | - Sam L Evans
- School of Engineering, Cardiff University, Cardiff, UK
| |
Collapse
|
9
|
Sajid HU, Kiran R. Improving the wettability of structural steels by employing ionic liquids. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
10
|
Effective Reinforcement of Melamine-functionalized WS2 Nanosheets in Epoxy Nanocomposites at Low Loading via Enhanced Interfacial Interaction. Macromol Res 2020. [DOI: 10.1007/s13233-020-8151-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
11
|
Zaborniak I, Macior A, Chmielarz P. Stimuli-Responsive Rifampicin-Based Macromolecules. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E3843. [PMID: 32878162 PMCID: PMC7503961 DOI: 10.3390/ma13173843] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/25/2020] [Accepted: 08/28/2020] [Indexed: 02/08/2023]
Abstract
This paper presents the modification of the antibiotic rifampicin by an anionic polyelectrolyte using a simplified electrochemically mediated atom transfer radical polymerization (seATRP) technique to receive stimuli-responsive polymer materials. Initially, a supramolecular ATRP initiator was prepared by an esterification reaction of rifampicin hydroxyl groups with α-bromoisobutyryl bromide (BriBBr). The structure of the initiator was successfully proved by nuclear magnetic resonance (1H and 13C NMR), Fourier-transform infrared (FT-IR) and ultraviolet-visible (UV-vis) spectroscopy. The prepared rifampicin-based macroinitiator was electrochemically investigated among various ATRP catalytic complexes, by a series of cyclic voltammetry (CV) measurements, determining the rate constants of electrochemical catalytic (EC') process. Macromolecules with rifampicin core and hydrophobic poly (n-butyl acrylate) (PnBA) and poly(tert-butyl acrylate) (PtBA) side chains were synthesized in a controlled manner, receiving polymers with narrow molecular weight distribution (Mw/Mn = 1.29 and 1.58, respectively). "Smart" polymer materials sensitive to pH changes were provided by transformation of tBA into acrylic acid (AA) moieties in a facile route by acidic hydrolysis. The pH-dependent behavior of prepared macromolecules was investigated by dynamic light scattering (DLS) determining a hydrodynamic radius of polymers upon pH changes, followed by a control release of quercetin as a model active substance upon pH changes.
Collapse
Affiliation(s)
- Izabela Zaborniak
- Department of Physical Chemistry, Faculty of Chemistry, Rzeszow University of Technology, al. Powstańców Warszawy 6, 35-959 Rzeszów, Poland;
| | - Angelika Macior
- School of Engineering and Technical Sciences, Rzeszow University of Technology, al. Powstańców Warszawy 8, 35-959 Rzeszów, Poland;
| | - Paweł Chmielarz
- Department of Physical Chemistry, Faculty of Chemistry, Rzeszow University of Technology, al. Powstańców Warszawy 6, 35-959 Rzeszów, Poland;
| |
Collapse
|
12
|
Zaborniak I, Chmielarz P. Miniemulsion switchable electrolysis under constant current conditions. POLYM ADVAN TECHNOL 2020. [DOI: 10.1002/pat.5007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Izabela Zaborniak
- Department of Physical Chemistry Rzeszow University of Technology Rzeszów Poland
| | - Paweł Chmielarz
- Department of Physical Chemistry Rzeszow University of Technology Rzeszów Poland
| |
Collapse
|
13
|
Zaborniak I, Chmielarz P, Flejszar M, Surmacz K, Ostatek R. Preparation of hydrophobic tannins‐inspired polymer materials via low‐ppm ATRP methods. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4825] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Izabela Zaborniak
- Department of Physical Chemistry, Faculty of ChemistryRzeszów University of Technology Rzeszów Poland
| | - Paweł Chmielarz
- Department of Physical Chemistry, Faculty of ChemistryRzeszów University of Technology Rzeszów Poland
| | - Monika Flejszar
- Department of Physical Chemistry, Faculty of ChemistryRzeszów University of Technology Rzeszów Poland
| | - Karolina Surmacz
- Doctoral School of Engineering and Technical SciencesRzeszów University of Technology Rzeszów Poland
| | - Robert Ostatek
- Spectroscopy Laboratory, Faculty of ChemistryRzeszów University of Technology Rzeszów Poland
| |
Collapse
|
14
|
Culhacioglu Y, Hasirci N, Dilek C. Highly Crystalline Poly(l-lactic acid) Porous Films Prepared with CO2-philic, Hybrid, Liquid Cell Nucleators. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04933] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yagmur Culhacioglu
- Department of Chemical Engineering, Middle East Technical University, Ankara 06800, Turkey
| | - Nesrin Hasirci
- Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
- BIOMATEN-Center of Excellence in Biomaterial and Tissue Engineering, Middle East Technical University, Ankara 06800, Turkey
| | - Cerag Dilek
- Department of Chemical Engineering, Middle East Technical University, Ankara 06800, Turkey
| |
Collapse
|
15
|
Masood MT, Zahid M, Goldoni L, Ceseracciu L, Athanassiou A, Bayer IS. Highly Transparent Polyethylcyanoacrylates from Approved Eco-Friendly Fragrance Materials Demonstrating Excellent Fog-Harvesting and Anti-Wear Properties. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34573-34584. [PMID: 30199218 DOI: 10.1021/acsami.8b10717] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Superglue monomers belong to a family of cyanoacrylates that are known for their very rapid polymerization upon contact with moist surfaces. Their biodegradation and low toxicity make them attractive as medical and veterinary adhesives. Although the fast-acting polymerization characteristics have been successfully utilized to design nanoscale polymeric particles that can carry drugs or other inorganic nanoparticles, it constitutes a significant drawback if one desires to produce other forms of functional biodegradable acrylics, such as coatings, sheets, or nanocomposites. This is because rapid polymerization in air creates highly porous and brittle structures. Here, we address this drawback by reporting a simple and inexpensive method of fabricating highly transparent (>92%) polyethylcyanoacrylate (PECA) coatings by dispersing the monomer in a fragrance-classified green liquid, cyclopentanone. The resulting transparent coatings were hydrophilic but with slippery wetting characteristics, suitable as efficient fog-harvesting templates. Furthermore, another fragrance liquid, benzyl alcohol, is introduced as a plasticizer and co-solvent to overcome its brittleness while retaining its transparency. The same plasticized monomer solutions, dispersing low concentrations of graphene (<0.5 wt %), were allowed to self-assemble on stainless steel surfaces, forming low-friction and anti-wear dry lubricants by decreasing the steel friction coefficient and wear rate by 6- and 10-fold, respectively.
Collapse
Affiliation(s)
- Muhammad Tamoor Masood
- Dipartimento di Informatica, Bioingegneria, Robotica e Ingegneria dei Sistemi (DIBRIS) , Università degli studi di Genova , Via Opera Pia 13 , 16145 Genoa , Italy
| | - Muhammad Zahid
- Dipartimento di Informatica, Bioingegneria, Robotica e Ingegneria dei Sistemi (DIBRIS) , Università degli studi di Genova , Via Opera Pia 13 , 16145 Genoa , Italy
| | | | | | | | | |
Collapse
|
16
|
Multiscale modeling of glass transition in polymeric films: Application to stereoregular poly(methyl methacrylate)s. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.05.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
17
|
Matavž A, Bobnar V, Malič B. Tailoring Ink-Substrate Interactions via Thin Polymeric Layers for High-Resolution Printing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:11893-11900. [PMID: 28895738 DOI: 10.1021/acs.langmuir.7b02181] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The surface properties of a substrate are among the most important parameters in the printing technology of functional materials, determining not only the printing resolution but also the stability of the printed features. This paper addresses the wetting difficulties encountered during inkjet printing on homogeneous substrates as a result of improper surface properties. We show that the wetting of a substrate and, consequently, the quality of the printed pattern, can be mediated through the deposition of polymeric layers that are a few nanometers thick. The chemical nature of the polymers determines the surface energy and polarity of the thin layer. Some applications, however, require a rigorous adjustment of the surface properties. We propose a simple and precise method of surface-energy tailoring based on the thermal decomposition of poly(methyl methacrylate) (PMMA) layers. A smooth transition in the wetting occurs when the thickness of the PMMA layer approaches zero, probably due to percolation of the underlying surface of the substrate, which enables the inkjet printing of complex structures with a high resolution. In particular, the wetting of three substrate-ink systems was successfully adjusted using the thin polymeric layer: (i) a tantalum-oxide-based ink on indium-tin-oxide-coated glass, (ii) a ferroelectric lead zirconate titanate ink on a platinized silicon substrate, and (iii) a silver nanoparticle ink on an alumina substrate.
Collapse
Affiliation(s)
- Aleksander Matavž
- Jožef Stefan Institute , Jamova cesta 39, 1000 Ljubljana, Slovenia
- Jožef Stefan International Postgraduate School , Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Vid Bobnar
- Jožef Stefan Institute , Jamova cesta 39, 1000 Ljubljana, Slovenia
- Jožef Stefan International Postgraduate School , Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Barbara Malič
- Jožef Stefan Institute , Jamova cesta 39, 1000 Ljubljana, Slovenia
- Jožef Stefan International Postgraduate School , Jamova cesta 39, 1000 Ljubljana, Slovenia
| |
Collapse
|
18
|
Large MJ, Ogilvie SP, Alomairy S, Vöckerodt T, Myles D, Cann M, Chan H, Jurewicz I, King AAK, Dalton AB. Selective Mechanical Transfer Deposition of Langmuir Graphene Films for High-Performance Silver Nanowire Hybrid Electrodes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12038-12045. [PMID: 28961004 DOI: 10.1021/acs.langmuir.7b02799] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work, we present silver nanowire hybrid electrodes prepared through the addition of small quantities of pristine graphene by mechanical transfer deposition from surface-assembled Langmuir films. This technique is a fast, efficient, and facile method for modifying the optoelectronic performance of AgNW films. We demonstrate that it is possible to use this technique to perform two-step device production by selective patterning of the stamp used, leading to controlled variation in the local sheet resistance across a device. This is particularly attractive for producing extremely low cost sensors on arbitrarily large scales. Our aim is to address some of the concerns surrounding the use of AgNW films as replacements for indium tin oxide (ITO), namely, the use of scarce materials and poor stability of AgNWs against flexural and environmental degradation.
Collapse
Affiliation(s)
- Matthew J Large
- University of Sussex , Falmer, Brighton BN1 9RH, United Kingdom
| | - Sean P Ogilvie
- University of Sussex , Falmer, Brighton BN1 9RH, United Kingdom
| | - Sultan Alomairy
- Taif University , Taif 26571, Saudi Arabia
- University of Surrey , Guildford GU2 7XH, United Kingdom
| | | | - David Myles
- M-Solv Ltd, Oxonian Park, Kidlington, Oxfordshire OX5 1FP, United Kingdom
| | - Maria Cann
- M-Solv Ltd, Oxonian Park, Kidlington, Oxfordshire OX5 1FP, United Kingdom
| | - Helios Chan
- M-Solv Ltd, Oxonian Park, Kidlington, Oxfordshire OX5 1FP, United Kingdom
| | | | - Alice A K King
- University of Sussex , Falmer, Brighton BN1 9RH, United Kingdom
| | - Alan B Dalton
- University of Sussex , Falmer, Brighton BN1 9RH, United Kingdom
| |
Collapse
|
19
|
Kim S, Geryak RD, Zhang S, Ma R, Calabrese R, Kaplan DL, Tsukruk VV. Interfacial Shear Strength and Adhesive Behavior of Silk Ionomer Surfaces. Biomacromolecules 2017; 18:2876-2886. [DOI: 10.1021/acs.biomac.7b00790] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Sunghan Kim
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Ren D. Geryak
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Shuaidi Zhang
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Ruilong Ma
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Rossella Calabrese
- Department
of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - David L. Kaplan
- Department
of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Vladimir. V. Tsukruk
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| |
Collapse
|
20
|
Selivanova N, Sautina N, Vezenov D, Stoyanov O, Galyametdinov Y. Evaluation of interactions between liquid crystal films and silane monolayers by atomic force microscopy. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.01.068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
21
|
Suzuki S, Ueno K. Apparent Contact Angle Calculated from a Water Repellent Model with Pinning Effect. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:138-143. [PMID: 28001421 DOI: 10.1021/acs.langmuir.6b03832] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A set of new theoretical equations for apparent contact angles is proposed. The equations are derived from an equilibrium of interfacial tensions of a three-phase contact line pinned at the edges of a fine structure. These equations are validated by comparison with contact-angle measurement results for 2 μL water droplets on poly(methyl methacrylate) microstructured samples with square pillars or holes. The equilibrium contact angles predicted by the new equations reasonably agree with the experimental results. In contrast, the values predicted by the Cassie-Baxter equation or the Wenzel equation do not qualitatively agree with the experimental results in pillar pattern cases because the Cassie-Baxter equation and the Wenzel equation do not account for the pinning effect.
Collapse
Affiliation(s)
- Shojiro Suzuki
- Graduate School of Engineering, Iwate University , 4-3-5 Ueda, Morioka 020-8551, Japan
| | - Kazuyuki Ueno
- Graduate School of Engineering, Iwate University , 4-3-5 Ueda, Morioka 020-8551, Japan
| |
Collapse
|
22
|
Hasturk O, Sivas A, Karasozen B, Demirci U, Hasirci N, Hasirci V. Quantification of Type, Timing, and Extent of Cell Body and Nucleus Deformations Caused by the Dimensions and Hydrophilicity of Square Prism Micropillars. Adv Healthc Mater 2016; 5:2972-2982. [PMID: 27925459 DOI: 10.1002/adhm.201600857] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/21/2016] [Indexed: 01/30/2023]
Abstract
Novel digital analysis strategies are developed for the quantification of changes in the cytoskeletal and nuclear morphologies of mesenchymal stem cells cultured on micropillars. Severe deformations of nucleus and distinct conformational changes of cell body ranging from extensive elongation to branching are visualized and quantified. These deformations are caused mainly by the dimensions and hydrophilicity of the micropillars.
Collapse
Affiliation(s)
- Onur Hasturk
- Graduate Department of Biotechnology; Middle East Technical University (METU); Ankara 06800 Turkey
- BIOMATEN; Center of Excellence in Biomaterials and Tissue Engineering; Middle East Technical University (METU); Ankara 06800 Turkey
| | - Abdullah Sivas
- Institute of Applied Mathematics; Middle East Technical University (METU); Ankara 06800 Turkey
| | - Bulent Karasozen
- Institute of Applied Mathematics; Middle East Technical University (METU); Ankara 06800 Turkey
| | - Utkan Demirci
- Bio-Acoustic-MEMs in Medicine (BAMM) Laboratory; Stanford School of Medicine; Palo Alto CA 94394 USA
| | - Nesrin Hasirci
- Graduate Department of Biotechnology; Middle East Technical University (METU); Ankara 06800 Turkey
- BIOMATEN; Center of Excellence in Biomaterials and Tissue Engineering; Middle East Technical University (METU); Ankara 06800 Turkey
- Department of Chemistry; Middle East Technical University (METU); Ankara 06800 Turkey
| | - Vasif Hasirci
- Graduate Department of Biotechnology; Middle East Technical University (METU); Ankara 06800 Turkey
- BIOMATEN; Center of Excellence in Biomaterials and Tissue Engineering; Middle East Technical University (METU); Ankara 06800 Turkey
- Department of Biological Sciences; Middle East Technical University (METU); Ankara 06800 Turkey
| |
Collapse
|
23
|
Zwitterionic Nanofibers of Super-Glue for Transparent and Biocompatible Multi-Purpose Coatings. Sci Rep 2015; 5:14019. [PMID: 26357936 PMCID: PMC4566136 DOI: 10.1038/srep14019] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 08/13/2015] [Indexed: 12/27/2022] Open
Abstract
Here we show that macrozwitterions of poly(ethyl 2-cyanoacrylate), commonly called Super Glue, can easily assemble into long and well defined fibers by electrospinning. The resulting fibrous networks are thermally treated on glass in order to create transparent coatings whose superficial morphology recalls the organization of the initial electrospun mats. These textured coatings are characterized by low liquid adhesion and anti-staining performance. Furthermore, the low friction coefficient and excellent scratch resistance make them attractive as solid lubricants. The inherent texture of the coatings positively affects their biocompatibility. In fact, they are able to promote the proliferation and differentiation of myoblast stem cells. Optically-transparent and biocompatible coatings that simultaneously possess characteristics of low water contact angle hysteresis, low friction and mechanical robustness can find application in a wide range of technological sectors, from the construction and automotive industries to electronic and biomedical devices.
Collapse
|
24
|
Kara F, Aksoy EA, Calamak S, Hasirci N, Aksoy S. Immobilization of heparin on chitosan-grafted polyurethane films to enhance anti-adhesive and antibacterial properties. J BIOACT COMPAT POL 2015. [DOI: 10.1177/0883911515598794] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Infections caused by bacteria adhering to implant surfaces are one of the main reasons for the failure of the implants. In this study, polyurethane (PU), which is the most commonly used polymer in the production of medical devices, was synthesized and surfaces of polyurethane films were modified by chitosan (CH) grafting and heparin (Hep) immobilization in order to enhance anti-adhesiveness and antibacterial properties. Functional groups present on the surface, topographical shapes, and free energies of the polyurethane films were determined. Pristine polyurethane, chitosan-grafted polyurethane (PU–CH), and heparin immobilized polyurethane (PU–CH–Hep) films demonstrated high anti-adhesive efficacy against bacteria in the given order, where PU–CH–Hep was the most effective one. When PU–CH–Hep samples were incubated with different bacteria, complete death was observed for Pseudomonas aeruginosa (Gram negative), Staphylococcus aureus (Gram positive), and Staphylococcus epidermidis (Gram positive). Some living Escherichia coli (Gram negative) were observed after 24 h of incubation. Pristine and modified polyurethane samples demonstrated no adverse effect on proliferation of L929 fibroblast cells and were found to be biocompatible according to MTT cytotoxicity tests.
Collapse
Affiliation(s)
- Filiz Kara
- Department of Chemistry, Faculty of Science, Gazi University, Ankara, Turkey
| | - Eda Ayse Aksoy
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Semih Calamak
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Nesrin Hasirci
- Graduate Department of Biotechnology, Middle East Technical University, Ankara, Turkey
- Department of Chemistry, Faculty of Arts and Sciences, Middle East Technical University, Ankara, Turkey
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University, Ankara, Turkey
| | - Serpil Aksoy
- Department of Chemistry, Faculty of Science, Gazi University, Ankara, Turkey
| |
Collapse
|
25
|
Choi YS, Kang H, Kim DG, Cha SH, Lee JC. Mussel-inspired dopamine- and plant-based cardanol-containing polymer coatings for multifunctional filtration membranes. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21297-21307. [PMID: 25415754 DOI: 10.1021/am506263s] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A series of copolymers [PCD#s, where # is the weight percentage of dopamine methacrylamide (DMA) in polymers] containing mussel-inspired hydrophilic dopamine and plant-based hydrophobic cardanol moieties was prepared via radical polymerization using DMA and 2-hydroxy-3-cardanylpropyl methacrylate (HCPM) as the monomers. PCD#s were used as coating materials to prevent flux decline of the membranes caused by the adhesion of biofoulants and oil-foulants. Polysulfone (PSf) ultrafiltration membranes coated with PCD#s showed higher biofouling resistance than the bare PSf membrane, and the bactericidal properties of the membranes increased upon increasing the content of HCPM units in the PCD#s. Serendipitously, the PSf membranes coated with the more or less amphiphilic PCD54 and PCD74, having the optimum amount of both hydrophilic DMA and hydrophobic HCPM moieties, showed noticeably higher oil-fouling resistance than the more hydrophilic PCD91-coated membrane, the more hydrophobic PCD0-coated membrane, and the bare PSf membrane. Therefore, multifunctional coating materials having biofouling- and oil-fouling-resistant and bactericidal properties could be prepared from the monomers containing mussel-inspired dopamine and plant-based cardanol groups.
Collapse
Affiliation(s)
- Yong-Seok Choi
- School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea
| | | | | | | | | |
Collapse
|
26
|
Milionis A, Ruffilli R, Bayer IS. Superhydrophobic nanocomposites from biodegradable thermoplastic starch composites (Mater-Bi®), hydrophobic nano-silica and lycopodium spores. RSC Adv 2014. [DOI: 10.1039/c4ra04117h] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
|
27
|
Ozbay S, Erbil HY. Solution copolymerization of perfluoroalkyl ethyl methacrylate with methyl methacrylate and butyl acrylate: Synthesis and surface properties. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.03.054] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
28
|
Li S, Yang D, Tu H, Deng H, Du D, Zhang A. Protein adsorption and cell adhesion controlled by the surface chemistry of binary perfluoroalkyl/oligo(ethylene glycol) self-assembled monolayers. J Colloid Interface Sci 2013; 402:284-90. [DOI: 10.1016/j.jcis.2013.04.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 04/03/2013] [Accepted: 04/04/2013] [Indexed: 10/26/2022]
|
29
|
Abstract
AbstractFacile surface modification of polyester films was performed via chemical solutions treatment. Surface hydrolysis was carried out by means of sodium hydroxide solutions, leading to the formation of carboxylate groups. Three commercial polyester films of 100 μm in thickness were used in this work: AryLite™, Mylar™, and Teonex™, hydrolysis time being the main modification parameter. FTIR-ATR analysis, topography and contact angle (CA) measurements, surface free energy (SFE) and T-Peel adhesion tests were carried out to characterize the modified films. A quantitative estimate of the carboxylates surface coverage as a function of treatment time was obtained through a supramolecular approach, i.e. the ionic self-assembly of a tetracationic porphyrin chromophore onto the film surface. The surface free energy and critical surface tension of the hydrolyzed polyesters was evaluated by means of Zisman, Saito, Berthelot and Owens-Wendt methods. It was shown that NaOH solution treatment increases roughness, polarity and surface free energy of polymers. As a result, T-Peel strengths for modified Mylar™ and Teonex™ films were respectively 2.2 and 1.8 times higher than that for the unmodified films, whereas AryLite™ adhesion test failed.
Collapse
|
30
|
Ozgen O, Aksoy EA, Hasirci V, Hasirci N. Surface characterization and radical decay studies of oxygen plasma-treated PMMA films. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.5181] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Ozge Ozgen
- Department of Polymer Science and Technology; Middle East Technical University; Ankara 06800 Turkey
- Department of Physics, Faculty of Engineering; Atılım University; Ankara 06836 Turkey
| | - Eda Ayse Aksoy
- Central Laboratory; Middle East Technical University; Ankara 06800 Turkey
- METU-BIOMATEN Center of Excellence in Biomaterials and Tissue Engineering; Ankara 06800 Turkey
| | - Vasif Hasirci
- Department of Polymer Science and Technology; Middle East Technical University; Ankara 06800 Turkey
- METU-BIOMATEN Center of Excellence in Biomaterials and Tissue Engineering; Ankara 06800 Turkey
- Department of Biological Sciences; Middle East Technical University; Ankara 06800 Turkey
- Department of Biotechnology; Middle East Technical University; Ankara 06800 Turkey
| | - Nesrin Hasirci
- Department of Polymer Science and Technology; Middle East Technical University; Ankara 06800 Turkey
- METU-BIOMATEN Center of Excellence in Biomaterials and Tissue Engineering; Ankara 06800 Turkey
- Department of Biotechnology; Middle East Technical University; Ankara 06800 Turkey
- Department of Chemistry; Middle East Technical University; Ankara 06800 Turkey
| |
Collapse
|
31
|
Kobayashi M, Terayama Y, Yamaguchi H, Terada M, Murakami D, Ishihara K, Takahara A. Wettability and antifouling behavior on the surfaces of superhydrophilic polymer brushes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7212-7222. [PMID: 22500465 DOI: 10.1021/la301033h] [Citation(s) in RCA: 266] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The surface wettabilities of polymer brushes with hydrophobic and hydrophilic functional groups were discussed on the basis of conventional static and dynamic contact angle measurements of water and hexadecane in air and captive bubble measurements in water. Various types of high-density polymer brushes with nonionic and ionic functional groups were prepared on a silicon wafer by surface-initiated atom-transfer radical polymerization. The surface free energies of the brushes were estimated by Owens-Wendt equation using the contact angles of various probe liquids with different polarities. The decrease in the water contact angle corresponded to the polarity of fluoroalkyl, hydroxy, ethylene oxide, amino, carboxylic acid, ammonium salt, sulfonate, carboxybetaine, sulfobetaine, and phosphobetaine functional groups. The poly(2-perfluorooctylethyl acrylate) brush had a low surface free energy of approximately 8.7 mN/m, but the polyelectrolyte brushes revealed much higher surface free energies of 70-74 mN/m, close to the value for water. Polyelectrolyte brushes repelled both air bubbles and hexadecane in water. Even when the silicone oil was spread on the polyelectrolyte brush surfaces in air, once they were immersed in water, the oil quickly rolled up and detached from the brush surface. The oil detachment behavior observed on the superhydrophilic polyelectrolyte brush in water was explained by the low adhesion force between the brush and the oil, which could contribute to its excellent antifouling and self-cleaning properties.
Collapse
Affiliation(s)
- Motoyasu Kobayashi
- Japan Science Technology Agency, ERATO, Takahara Soft Interfaces Project.
| | | | | | | | | | | | | |
Collapse
|
32
|
Abstract
Addition of hydroxyapatite (HAp) into polymeric matrices and use them as supporting material for tissue engineering has gained attraction since hydroxyapatite (HAp) type crystals are the main inorganic components of the bone structure. In this study, composite films were prepared from chitosan (C) and gelatin (G) with addition of HAp, and the surface characterization and cell affinity properties were examined. The hydrophilicities and morphologies of the films were investigated by contact angle measurements and by scanning electron microscopy (SEM), respectively. Cell affinities were studied by using human osteosarcoma (SaOs-2) cell line. Crosslinked and HAp containing films were found to be more hydrophilic than that of the others, while surface free energy (SFE) values were almost similar for all films. Cell proliferation and spreading of SaOs-2 cells were higher for the films with high gelatin content and no HAp; whereas for HAp containing composites higher cell affinities were obtained for the samples which have high chitosan content.
Collapse
|
33
|
Kruszewski KM, Gawalt ES. Perfluorocarbon thin films and polymer brushes on stainless steel 316 L for the control of interfacial properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8120-5. [PMID: 21631123 PMCID: PMC3126892 DOI: 10.1021/la200792t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Perfluorocarbon thin films and polymer brushes were formed on stainless steel 316 L (SS316L) to control the surface properties of the metal oxide. Substrates modified with the films were characterized using diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), contact angle analysis, atomic force microscopy (AFM), and cyclic voltammetry (CV). Perfluorooctadecanoic acid (PFOA) was used to form thin films by self-assembly on the surface of SS316L. Polypentafluorostyrene (PFS) polymer brushes were formed by surface-initiated polymerization using SAMs of 16-phosphonohexadecanoic acid (COOH-PA) as the base. PFOA and PFS were effective in significantly reducing the surface energy and thus the interfacial wetting properties of SS316L. The SS316L control exhibited a surface energy of 38 mN/m compared to PFOA and PFS modifications, which had surface energies of 22 and 24 mN/m, respectively. PFOA thin films were more effective in reducing the surface energy of the SS316L compared to PFS polymer brushes. This is attributed to the ordered PFOA film presenting aligned CF(3) terminal groups. However, PFS polymer brushes were more effective in providing corrosion protection. These low-energy surfaces could be used to provide a hydrophobic barrier that inhibits the corrosion of the SS316L metal oxide surface.
Collapse
Affiliation(s)
- Kristen M Kruszewski
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA
| | | |
Collapse
|
34
|
Wang S, Zhang Y, Abidi N, Cabrales L. Wettability and surface free energy of graphene films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:11078-81. [PMID: 19735153 DOI: 10.1021/la901402f] [Citation(s) in RCA: 430] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Graphene sheets were produced through chemical exfoliation of natural graphite flake and hydrazine conversion. Subsequently, graphene sheets were assembled into a thin film, and microscale liquid droplets were placed onto the film surface for measurement of wettability and contact angle. It is found that a graphene oxide sheet is hydrophilic and a graphene sheet is hydrophobic. Isolated graphene layers seem more difficult to wet in comparison to graphite, and low adhesion work was found in the graphene-liquid interface. Approximation of solid-liquid interfacial energy with the equation of state theory was applied to determine the graphene surface energy. The results indicate that surface energy of graphene and graphene oxide is 46.7 and 62.1 mJ/m2, respectively, while natural graphite flake shows a surface free energy of 54.8 mJ/m2 at room temperature. These results will provide valuable guidance for the design and manufacturing of graphene-based biomaterials, medical instruments, structural composites, electronics, and renewable energy devices.
Collapse
Affiliation(s)
- Shiren Wang
- Department of Industrial Engineering, Fiber and Biopolymer Institute, Texas Tech University, Lubbock, TX 79409, USA.
| | | | | | | |
Collapse
|
35
|
Zorlutuna P, Yılgör P, Başmanav FB, Hasırcı V. Biomaterials and tissue engineering research in Turkey: The METU Biomat Center experience. Biotechnol J 2009; 4:965-80. [DOI: 10.1002/biot.200800335] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
36
|
Zhuang YX, Hansen O. Correlation of effective dispersive and polar surface energies in heterogeneous self-assembled monolayer coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5437-5441. [PMID: 19371057 DOI: 10.1021/la804318p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We show, theoretically, that the measured effective dispersive and polar surface energies of a heterogeneous surface are correlated; the correlation, however, differs whether a Cassie or an Israelachvili and Gee model is assumed. Fluorocarbon self-assembled monolayers with varying coverage were grown on oxidized (100) silicon surfaces in a vapor phase process using five different precursors. Experimentally, effective surface energy components of the fluorocarbon self-assembled monolayers were determined from measured contact angles using the Owens-Wendt-Rabel-Kaelble method. We show that the correlation between the effective surface energy components of the heterogeneous surfaces coated with fluorocarbon self-assembled monolayers is in agreement with the Cassie model.
Collapse
Affiliation(s)
- Yan Xin Zhuang
- Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, PR China.
| | | |
Collapse
|