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Apsey H, Hill D, McCoy TM, Villeda-Hernandez M, Faul CFJ, Alexander S. Conductive hydrophobic graphene oxide films via laser-scribed surface modification. J Colloid Interface Sci 2025; 687:189-196. [PMID: 39952110 DOI: 10.1016/j.jcis.2025.02.055] [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: 11/08/2024] [Revised: 01/20/2025] [Accepted: 02/08/2025] [Indexed: 02/17/2025]
Abstract
Graphene oxide (GO) can be surface modified for various purposes, including enhancing its properties or tailoring its behaviour for specific applications such as biosensing. Herein we report the behaviour of a carboxylate functionalized graphene oxide that is both water repellent and electrically conductive. The GO is first produced using a modified Hummers method and then functionalized with a hyperbranched isostearic alcohol through an esterification reaction. The as-deposited functionalized GO films were observed to cause "petal-like" wetting of water, whereby droplets exhibited contact angles (CAs) greater than 150° and remaining pinned to the surface. To improve their conductivity, films of the functionalized GO deposited onto glass were laser-scribed to reduce some of the specific, adjoining regions of oxidic carbon to partially restore some of the sp2 C network. This improved the conductivity of the as-deposited GO films by approximately four orders of magnitude from 0.002 to ∼20 S/m using the low laser scan speed of 250 mm/min. It was observed that with a high laser scan speed of 500 mm/min some of the hydrophobic character was retained (CAs ∼110°), whilst maintaining conductivities of up to 0.17 S/m. Consequently, these materials show promise for applications such as biosensing materials, where tuneable hydrophobicity combined with conductivity are required characteristics.
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Affiliation(s)
- Henry Apsey
- Department of Chemical Engineering, Swansea University Bay Campus, Fabian Way, Swansea SA1 8EN UK
| | - Donald Hill
- Department of Chemical Engineering, Swansea University Bay Campus, Fabian Way, Swansea SA1 8EN UK
| | - Thomas M McCoy
- Department of Radiation Science and Technology, Technische Universiteit Delft, Delft 2629JB The Netherlands
| | | | - Charl F J Faul
- School of Chemistry, University of Bristol, Bristol BS8 1TS UK
| | - Shirin Alexander
- Department of Chemical Engineering, Swansea University Bay Campus, Fabian Way, Swansea SA1 8EN UK.
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Shome A, Martinez I, Pinon VD, Moses JC, Garren M, Sapkota A, Crutchfield N, Francis DJ, Brisbois E, Handa H. "Reactive" Chemical Strategy to Attain Substrate Independent " Liquid-Like" Omniphobic Solid Anti-Biofouling Coatings. ADVANCED FUNCTIONAL MATERIALS 2024; 34:2401387. [PMID: 39678671 PMCID: PMC11636641 DOI: 10.1002/adfm.202401387] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Indexed: 12/17/2024]
Abstract
Covalent and defect-free surface-grafted solid lubricating chains that can impart 'liquid-like' slippery behavior have proven advantageous over lubricant infused and textured anti-wetting surfaces. Herein, the co-hydrolysis and co-condensation of a mixture of organosilanes followed by the epoxy-amine ring opening reaction at the interface results in a highly robust, transparent and 'liquid-like' solid slippery omniphobic coating (LL-OSC). The presence of the epoxy-terminated organosilane a) acts as a molecular spacer in between the low-surface energy, rigid fluorine terminated silane and b) provides 'reactive' epoxy groups for covalent binding to a pre-functionalized amine surface for potential applicability in droplet transport and manipulation, diagnostics etc. LL-OSC exhibits resistance to both solid and liquid abrasions such as sandpaper abrasions, prolonged UV irradiation, DI water and high temperature (30 days), submersion in chemically contaminated aqueous solutions. This is the first report of a hemocompatible solid slippery coating for inhibiting platelet adhesion, thus, paving way for blood-contacting medical device applications. Our LL-OSC exhibits remarkable cytocompatibility, repellence to plasma protein, cells and prevents biofilm formation. Additionally, the substrate independent LL-OSC can be applied onto metals and polymers. We envision that the reported durable, solid slippery coating will find widespread applicability in hospital settings, electronic devices etc.
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Affiliation(s)
- Arpita Shome
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
| | - Isabel Martinez
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
| | - Vicente D Pinon
- Pharmaceutical and Biomedical Science Department, College of Pharmacy, University of Georgia, Athens, GA 30602, United States
| | - Joseph C Moses
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
| | - Mark Garren
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
| | - Aasma Sapkota
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
| | - Natalie Crutchfield
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
| | - Divine J Francis
- Department of Chemistry, University of Georgia, Athens, GA 30602, United States
| | - Elizabeth Brisbois
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
| | - Hitesh Handa
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens, Georgia, 30602, United States of America
- Pharmaceutical and Biomedical Science Department, College of Pharmacy, University of Georgia, Athens, GA 30602, United States
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Wang J, Wang Y, Zhang K, Liu X, Zhang S, Wang D, Xie L. Understanding the role of infusing lubricant composition in the interfacial interactions and properties of slippery surface. J Colloid Interface Sci 2024; 659:289-298. [PMID: 38176238 DOI: 10.1016/j.jcis.2023.12.174] [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: 10/06/2023] [Revised: 12/25/2023] [Accepted: 12/29/2023] [Indexed: 01/06/2024]
Abstract
Liquid-infused surfaces (LISs) have attracted tremendous attention in recent years owing to their excellent surface properties, such as self-cleaning and anti-fouling. Understanding the effect of lubricant composition on LIS performance is of vital importance, which will help establish the criteria to choose suitable infusing lubricants for specific applications. In this work, the role of chemical composition of lubricant in the properties of LISs was investigated. The apparent water contact angle θapp was dependent on the temperature and beeswax/silicone oil ratio. Nevertheless, the trend of moving velocity of water drop on the tilted LISs did not follow that of θapp at 20 °C and 37 °C, which was attributed to the increased lubricant viscosity with beeswax/silicone oil ratio. At 60 °C, the drop velocity and θapp shared the similar variation trend with beeswax/silicone oil ratio, highlighting the significant role of chemistry of the components in beeswax. The alkanes and fatty acids promoted the drop movement, while the fatty acid esters impeded the movement. The interaction forces between water drop and lubricant surfaces were measured using atomic force microscopy. It was demonstrated that the interaction between water drop and lubricant was not the only factor to control the drop movement, while the interaction between lubricant and substrate as well as of lubricant itself also determined the movement. When the adhesions of water-lubricant and lubricant-substrate were similar for different lubricants, the influence of cohesion of lubricant became significant. This work provides useful insights into the fundamental understanding of the interfacial interactions of test drop, infusing lubricant and solid substrate of LISs, and the effect of infusing lubricant composition on the LIS performance.
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Affiliation(s)
- Jingyi Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; Sichuan Provincial Key Laboratory of Oil and Gas Fields Applied Chemistry, Chengdu, Sichuan 610500, China.
| | - Yifan Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Kuanjun Zhang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Xun Liu
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Shishuang Zhang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China; Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China
| | - Dianlin Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; Sichuan Provincial Key Laboratory of Oil and Gas Fields Applied Chemistry, Chengdu, Sichuan 610500, China.
| | - Lei Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China; Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China.
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Jia R, Hoffman BN, Kozlov AV, Demos SG, Shestopalov AA. Monolayer organic thin films as particle-contamination-resistant coatings. Sci Rep 2023; 13:11387. [PMID: 37452059 PMCID: PMC10349057 DOI: 10.1038/s41598-023-37813-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 06/28/2023] [Indexed: 07/18/2023] Open
Abstract
Three organic monolayers coatings were developed and tested for their effectiveness to increase cleaning efficiency of attached microscale particles by air flows. The experiments were performed using silica substrates coated with these organic thin films and subsequently exposed to stainless-steel and silica microparticles as a model of contamination. Laser-induced-damage tests confirmed that the coatings do not affect the laser-induced-damage threshold values. The particle exposure results suggest that although the accumulation of particles is not significantly affected under the experimental conditions used in this work, the coated substrates exhibit significantly improved cleaning efficiency with a gas flow. A size-distribution analysis was conducted to study the adsorption and cleaning efficiency of particles of different sizes. It was observed that larger size (> 5-μm) particles can be removed from coated substrates with almost 100% efficiency. It was also determined that the coatings improve the cleaning efficiency of the smaller particles (≤ 5 μm) by 17% to 30% for the stainless steel metal and 19% to 38% for the silica particles.
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Affiliation(s)
- Ruobin Jia
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA
- Department of Chemical Engineering, University of Rochester, Rochester, NY, 14627, USA
| | - Brittany N Hoffman
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA
| | - Alexei V Kozlov
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA
| | - Stavros G Demos
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA
| | - Alexander A Shestopalov
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA.
- Department of Chemical Engineering, University of Rochester, Rochester, NY, 14627, USA.
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