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Moreira Lana G, Zhang X, Müller C, Hensel R, Arzt E. Film-Terminated Fibrillar Microstructures with Improved Adhesion on Skin-like Surfaces. ACS APPLIED MATERIALS & INTERFACES 2022; 14:46239-46251. [PMID: 36195314 PMCID: PMC9586108 DOI: 10.1021/acsami.2c12663] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
Adhesives for interaction with human skin and tissues are needed for multiple applications. Micropatterned dry adhesives are potential candidates, allowing for a conformal contact and glue-free adhesion based on van der Waals interactions. In this study, we investigate the superior adhesion of film-terminated fibrillar microstructures (fibril diameter, 60 μm; aspect ratio, 3) in contact with surfaces of skin-like roughness (Rz 50 μm). Adhesion decays only moderately with increasing roughness, in contrast to unstructured samples. Sinusoidal model surfaces adhere when their wavelengths exceed about four fibril diameters. The film-terminated microstructure exhibits a saturation of the compressive force during application, implying a pressure safety regime protecting delicate counter surfaces. Applications of this novel adhesive concept are foreseen in the fields of wearable electronics and wound dressing.
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Affiliation(s)
- Gabriela Moreira Lana
- INM—Leibniz
Institute for New Materials, Campus D2 2, 66123Saarbrücken, Germany
- Department
of Materials Science and Engineering, Saarland
University, Campus D2
2, 66123Saarbrücken, Germany
| | - Xuan Zhang
- INM—Leibniz
Institute for New Materials, Campus D2 2, 66123Saarbrücken, Germany
| | - Christian Müller
- INM—Leibniz
Institute for New Materials, Campus D2 2, 66123Saarbrücken, Germany
| | - René Hensel
- INM—Leibniz
Institute for New Materials, Campus D2 2, 66123Saarbrücken, Germany
| | - Eduard Arzt
- INM—Leibniz
Institute for New Materials, Campus D2 2, 66123Saarbrücken, Germany
- Department
of Materials Science and Engineering, Saarland
University, Campus D2
2, 66123Saarbrücken, Germany
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2
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Jha A, Karnal P, Frechette J. Adhesion of fluid infused silicone elastomer to glass. SOFT MATTER 2022; 18:7579-7592. [PMID: 36165082 DOI: 10.1039/d2sm00875k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Elastomers swollen with non-polar fluids show potential as anti-adhesive materials. We study the effect of oil fraction and contact time on the adhesion between swollen spherical probes of PDMS (polydimethylsiloxane) and flat glass surfaces. The PDMS probes are swollen with pre-determined amount of 10 cSt silicone oil to span the range where the PDMS is fluid free (via solvent extraction) up to the limit where it is oil saturated. Probe tack measurements show that adhesion decreases rapidly with an increase in oil fraction. The decrease in adhesion is attributed to excess oil present at the PDMS-air interface. Contact angle measurements and optical microscopy images support this observation. Adhesion also increases with contact time for a given oil fraction. The increase in adhesion with contact time can be interpreted through different competing mechanisms that depend on the oil fraction where the dominant mechanism changes from extracted to fully swollen PDMS. For partially swollen PDMS, we observe that adhesion initially increases because of viscoelastic relaxation and at long times increases because of contact aging. In contrast, adhesion between fully swollen PDMS and glass barely increases over time and is mainly due to capillary forces. While the relaxation of PDMS in contact is well-described by a visco-poroelastic model, we do not see evidence that poroelastic relaxation of the PDMS contributes to an increase of adhesion with glass whether it is partially or fully swollen.
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Affiliation(s)
- Anushka Jha
- Chemical and Biomolecular Engineering Department, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Preetika Karnal
- Chemical and Biomolecular Engineering Department, Johns Hopkins University, Baltimore, MD 21218, USA
- Department of Chemical and Biomolecular Engineering, Lehigh University, 124 E Morton St, Building 205, Bethlehem, Pennsylvania 18015, USA
| | - Joelle Frechette
- Chemical and Biomolecular Engineering Department, Johns Hopkins University, Baltimore, MD 21218, USA
- Chemical and Biomolecular Engineering Department, University of California, Berkeley, CA 94760, USA.
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Mohanan VV, Mak HYL, Gurung N, Xu Q. Multiscale Soft Surface Instabilities for Adhesion Enhancement. MATERIALS 2022; 15:ma15030852. [PMID: 35160799 PMCID: PMC8836914 DOI: 10.3390/ma15030852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/16/2022] [Accepted: 01/19/2022] [Indexed: 11/16/2022]
Abstract
Soft polymeric gels are susceptible to buckling-induced instabilities due to their great compliance to surface deformations. The instability patterns at soft interfaces have great potential in engineering functional materials with unique surface properties. In this work, we systematically investigated how swelling-induced instability patterns effectively improved the adhesive properties of soft polydimethylsiloxane (PDMS) gels. We directly imaged the formations of the surface instability features during the relaxation process of a swollen gel substrate. The features were found to greatly increase the adhesion energy of soft gels across multiple length scales, and the adhesion enhancement was associated with the variations of contact lines both inside the contact region and along the contact periphery. We expect that these studies of instability patterns due to swelling will further benefit the design of functional interfaces in various engineering applications.
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Affiliation(s)
- Vaisakh Vilavinalthundil Mohanan
- Department of Physics, Faculty of Sciences, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China; (V.V.M.); (H.Y.L.M.)
| | - Ho Yi Lydia Mak
- Department of Physics, Faculty of Sciences, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China; (V.V.M.); (H.Y.L.M.)
- Department of Geoscience and Remote Sensing, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands
| | - Nishan Gurung
- Department of Mathematics, Faculty of Sciences, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China;
| | - Qin Xu
- Department of Physics, Faculty of Sciences, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China; (V.V.M.); (H.Y.L.M.)
- Correspondence:
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Tao C, Jin M, Yao H, Wang DA. Dopamine based adhesive nano-coatings on extracellular matrix (ECM) based grafts for enhanced host-graft interfacing affinity. NANOSCALE 2021; 13:18148-18159. [PMID: 34709280 DOI: 10.1039/d1nr06284k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Interfacing affinity between grafts and host tissues is an urgent issue that needs to be addressed for the clinical translation of tissue engineered extracellular matrix (ECM) based grafts. Dopamine is known as a universal adhesive, the catechol groups on which could form chelating bonds with metal ions. Herein we developed an adhesive nano-coating on ECM based grafts which could crosslink in situ with ferric ions for fixation with surrounding tissues after implantation without affecting the porous structures of the grafts. Therefore, decellularized living hyaline cartilage graft (dLhCG), a model ECM-based graft, with dopamine based natural biological material adhesive coatings was manufactured to address the interfacing affinity issue between ECM-based grafts and cartilage. A macromolecule backbone was needed for the coating material to avoid the formation of a rigid crosslinking system and adverse effects caused by small molecules of dopamine. Chondroitin sulfate (CS), a cartilage derived sulfated GAG, was chosen as the backbone to fabricate dopamine modified CS (CSD) with no impurities introduced to the joint. Dopamine modified serum albumin (BCD) was also chosen for the favorable biocompatibility of albumin. Both dLhCG coated with CSD and dLhCG coated with BCD showed enhanced adhesive strength with cartilage after chelating with ferric ions in situ compared to dLhCG and further potential in improving the interfacing affinity of dLhCG with cartilage.
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Affiliation(s)
- Chao Tao
- Karolinska Institutet Ming Wai Lau Centre for Reparative Medicine, HKSTP, Sha Tin, Hong Kong SAR.
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR
| | - Min Jin
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR
| | - Hang Yao
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, Jiangsu, P. R. China.
| | - Dong-An Wang
- Karolinska Institutet Ming Wai Lau Centre for Reparative Medicine, HKSTP, Sha Tin, Hong Kong SAR.
- Department of Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR
- Shenzhen Research Institute, City University of Hong Kong, Shenzhen, P. R. China
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Aizamddin MF, Mahat MM, Ariffin ZZ, Samsudin I, Razali MSM, Amir M‘A. Synthesis, Characterisation and Antibacterial Properties of Silicone-Silver Thin Film for the Potential of Medical Device Applications. Polymers (Basel) 2021; 13:polym13213822. [PMID: 34771378 PMCID: PMC8588057 DOI: 10.3390/polym13213822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 10/29/2021] [Accepted: 10/30/2021] [Indexed: 12/14/2022] Open
Abstract
Silver (Ag) particles have sparked considerable interest in industry and academia, particularly for health and medical applications. Here, we present the “green” and simple synthesis of an Ag particle-based silicone (Si) thin film for medical device applications. Drop-casting and peel-off techniques were used to create an Si thin film containing 10–50% (v/v) of Ag particles. Electro impedance spectroscopy (EIS), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and tensile tests were used to demonstrate the electrical conductivity, crystallinity, morphology-elemental, and mechanical properties, respectively. The oriented crystalline structure and excellent electronic migration explained the highest conductivity value (1.40 × 10−5 S cm−1) of the 50% Ag–Si thin film. The findings regarding the evolution of the conductive network were supported by the diameter and distribution of Ag particles in the Si film. However, the larger size of the Ag particles in the Si film resulted in a lower tensile stress of 68.23% and an elongation rate of 68.25% compared to the pristine Si film. The antibacterial activity of the Ag–Si film against methicillin-resistant Staphylococcus aureus (MRSA), Bacillus cereus (B. cereus), Klebsiella pneumoniae (K. pneumoniae), and Pseudomonas aeruginosa (P. aeruginosa) was investigated. These findings support Si–Ag thin films’ ability to avoid infection in any medical device application.
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Affiliation(s)
- Muhammad Faiz Aizamddin
- School of Physics and Material Studies, Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam 40450, Malaysia;
| | - Mohd Muzamir Mahat
- School of Physics and Material Studies, Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam 40450, Malaysia;
- Correspondence: (M.M.M.); (M.A.A.)
| | - Zaidah Zainal Ariffin
- School of Biology, Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam 40450, Malaysia;
| | - Irwan Samsudin
- Department of Cardiovascular and Thoracic Surgery, Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh 47000, Malaysia; (I.S.); (M.S.M.R.)
| | - Muhammad Syafiek Mohd Razali
- Department of Cardiovascular and Thoracic Surgery, Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh 47000, Malaysia; (I.S.); (M.S.M.R.)
| | - Muhammad ‘Abid Amir
- Department of Cardiovascular and Thoracic Surgery, Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh 47000, Malaysia; (I.S.); (M.S.M.R.)
- Correspondence: (M.M.M.); (M.A.A.)
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Sorg K, Heimann L, Lana GM, Langenbucher A, Schick B, Arzt E, Wenzel GI. Optoacoustically induced auditory brainstem responses in the mouse model enhanced through an absorbing film. JOURNAL OF BIOMEDICAL OPTICS 2021; 26:JBO-210173R. [PMID: 34480448 PMCID: PMC8414560 DOI: 10.1117/1.jbo.26.9.098001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
SIGNIFICANCE Optoacoustic stimulation offers an alternative stimulation strategy for the hearing organ. To serve as the base for a novel auditory prosthesis, the optoacoustic stimulation must be biocompatible and energy-saving. AIM Enhancing the efficiency of optoacoustic stimulation while reducing the energy input in a suited animal model. APPROACH Optoacoustically induced auditory brainstem responses (oABRs) were recorded after the pulsed laser irradiation of the tympanic membrane (TM) in mice. The results were compared with the ABRs induced through acoustic click stimulation. In addition, self-adhesive absorbing films were applied on the TM before the optoacoustic stimulation to investigate their effect on the resulting ABRs. RESULTS Using an absorbing film on the TM during optical stimulation led to considerably enhanced oABR wave I amplitude values compared with the stimulation of the bare TM. When using our stimulation strategy, we induced oABR waves in the 50% to 60% range of the acoustical stimulation reached with 80-dB SPL click stimuli. CONCLUSIONS The mouse model can be used for certain developmental work for an optoacoustic auditory prosthesis. Using absorbing films on the TM during optical stimulation considerably enhances oABR wave I amplitude. Optimization of the stimulation strategy could further enhance the efficiency within biocompatibility margins.
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Affiliation(s)
- Katharina Sorg
- Saarland University Medical Center, Department of Otorhinolaryngology, Homburg, Germany
| | - Larissa Heimann
- Saarland University Medical Center, Department of Otorhinolaryngology, Homburg, Germany
| | - Gabriela Moreira Lana
- INM Leibniz Institute for New Materials, Saarbrücken, Germany
- Saarland University, Department of Materials Science and Engineering, Saarbrücken, Germany
| | - Achim Langenbucher
- Saarland University, Department of Experimental Ophthalmology, Homburg, Germany
| | - Bernhard Schick
- Saarland University Medical Center, Department of Otorhinolaryngology, Homburg, Germany
| | - Eduard Arzt
- INM Leibniz Institute for New Materials, Saarbrücken, Germany
- Saarland University, Department of Materials Science and Engineering, Saarbrücken, Germany
| | - Gentiana Ioana Wenzel
- Saarland University Medical Center, Department of Otorhinolaryngology, Homburg, Germany
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Moreira Lana G, Sorg K, Wenzel GI, Hecker D, Hensel R, Schick B, Kruttwig K, Arzt E. Self‐Adhesive Silicone Microstructures for the Treatment of Tympanic Membrane Perforations. ADVANCED NANOBIOMED RESEARCH 2021. [DOI: 10.1002/anbr.202100057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
- Gabriela Moreira Lana
- INM – Leibniz Institute for New Materials Campus D2 2 Saarbrücken 66123 Germany
- Department of Materials Science and Engineering Saarland University Campus D2 2 Saarbrücken 66123 Germany
| | - Katharina Sorg
- Department of Otorhinolaryngology Saarland University Medical Center Homburg 66421 Germany
| | - Gentiana Ioana Wenzel
- Department of Otorhinolaryngology Saarland University Medical Center Homburg 66421 Germany
| | - Dietmar Hecker
- Department of Otorhinolaryngology Saarland University Medical Center Homburg 66421 Germany
| | - René Hensel
- INM – Leibniz Institute for New Materials Campus D2 2 Saarbrücken 66123 Germany
| | - Bernhard Schick
- Department of Otorhinolaryngology Saarland University Medical Center Homburg 66421 Germany
| | - Klaus Kruttwig
- INM – Leibniz Institute for New Materials Campus D2 2 Saarbrücken 66123 Germany
| | - Eduard Arzt
- INM – Leibniz Institute for New Materials Campus D2 2 Saarbrücken 66123 Germany
- Department of Materials Science and Engineering Saarland University Campus D2 2 Saarbrücken 66123 Germany
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Chen S, Gil CJ, Ning L, Jin L, Perez L, Kabboul G, Tomov ML, Serpooshan V. Adhesive Tissue Engineered Scaffolds: Mechanisms and Applications. Front Bioeng Biotechnol 2021; 9:683079. [PMID: 34354985 PMCID: PMC8329531 DOI: 10.3389/fbioe.2021.683079] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/15/2021] [Indexed: 11/13/2022] Open
Abstract
A variety of suture and bioglue techniques are conventionally used to secure engineered scaffold systems onto the target tissues. These techniques, however, confront several obstacles including secondary damages, cytotoxicity, insufficient adhesion strength, improper degradation rate, and possible allergic reactions. Adhesive tissue engineering scaffolds (ATESs) can circumvent these limitations by introducing their intrinsic tissue adhesion ability. This article highlights the significance of ATESs, reviews their key characteristics and requirements, and explores various mechanisms of action to secure the scaffold onto the tissue. We discuss the current applications of advanced ATES products in various fields of tissue engineering, together with some of the key challenges for each specific field. Strategies for qualitative and quantitative assessment of adhesive properties of scaffolds are presented. Furthermore, we highlight the future prospective in the development of advanced ATES systems for regenerative medicine therapies.
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Affiliation(s)
- Shuai Chen
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Carmen J. Gil
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Liqun Ning
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Linqi Jin
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Lilanni Perez
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Gabriella Kabboul
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Martin L. Tomov
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Vahid Serpooshan
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, United States
- Children’s Healthcare of Atlanta, Atlanta, GA, United States
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