Cephalopods Inspired Rapid Self-Healing Nanoclay Composite Coatings with Oxygen Barrier and Super-Bubble-Phobic Properties

Polymeric coatings with oxygen barrier properties are an important technology in food packaging that can extend the shelf life of food products and reduce waste. Although a typical technology in practical use is the deposition of metal or inorganic materials between multilayer films to reduce the oxygen transmission rate, once the film is damaged, oxygen permeates through the damaged area, damaging the packaged food. In addition, nanobrick wall structures consisting of nanoplatelet bricks have the potential to replace barrier films made of inorganic materials, however, they similarly lack repair performance or have slow repair speed despite having repair performance. Inspired by the rapid self-repair mechanism of cephalopods, the study develops a nanoclay-containing coating that can rapidly repair surface damage via water. By introducing CaCl<sub>2</sub>-derived counterions and montmorillonite for nanobrick wall structures into polyelectrolyte multilayers stacked by layer-by-layer self-assembly, the non-covalent polymer network is increased, resulting in mimicking a strong cephalopod-derived β-sheet structure and non-covalent intermolecular interactions derived from cephalopods. Regardless of the amount of montmorillonite added, the self-healing process was completed within 10 sec. The high-water retention at the surface showed super-bubble-phobicity in water and inhibited gas permeation. The oxygen permeability of the coatings with more than a certain amount of montmorillonite was less than 1/100 of that of bare polyethylene. The ultra-fast self-healing gas barrier coating has the potential to be used not only for food products but also for electronics and pharmaceutical packaging and gas separation applications. The key technology developed in this study provides novel insights into the construction of self-healing membranes made of composite materials and will contribute to the formation of a sustainable society.

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Cephalopods Inspired Rapid Self-Healing Nanoclay Composite Coatings with Oxygen Barrier and Super-Bubble-Phobic Properties

10.26434/chemrxiv.14625993.v1 ◽

2021 ◽

Author(s):

Kengo Manabe ◽

Yasuo Norikane ◽

Emiko Koyama

Keyword(s):

Composite Coatings ◽

Healing Process ◽

Polymer Network ◽

Food Products ◽

Gas Permeation ◽

Inorganic Materials ◽

Oxygen Barrier ◽

Self Healing ◽

Oxygen Transmission Rate ◽

Wall Structures

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Cephalopods-Inspired Rapid Self-Healing Nanoclay Composite Coatings with Oxygen Barrier and Super-Bubble-Phobic Properties

ACS Applied Materials & Interfaces ◽

10.1021/acsami.1c09588 ◽

2021 ◽

Author(s):

Kengo Manabe ◽

Emiko Koyama ◽

Yasuo Norikane

Keyword(s):

Composite Coatings ◽

Oxygen Barrier ◽

Self Healing

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Inhibitor-Containing Composite Coatings on Mg Alloys: Corrosion Mechanism and Self-Healing Protection

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.245.89 ◽

2015 ◽

Vol 245 ◽

pp. 89-96 ◽

Cited By ~ 9

Author(s):

Andrey S. Gnedenkov ◽

Sergey L. Sinebryukhov ◽

Dmitry V. Mashtalyar ◽

Sergey V. Gnedenkov

Keyword(s):

Plasma Electrolytic Oxidation ◽

Composite Coatings ◽

Healing Process ◽

Corrosion Mechanism ◽

Self Healing ◽

Protective Properties ◽

Oxidation Method ◽

Electrolytic Oxidation ◽

Plasma Electrolytic ◽

Electrode Technique

The way of self-healing coating formation at the surface of magnesium alloys by means of plasma electrolytic oxidation method (PEO) with subsequent filling of the obtained layer with inhibitor has been suggested. The electrochemical properties of such coatings have been described in details. The obtained experimental results indicate that the protective properties of the samples with inhibitor-containing coating were increased (IC = 8.6×10–8 A/cm2) in comparison with the samples without coating (5.3×10–5 A/cm2) and the base coating obtained by plasma electrolytic oxidation method (PEO) (3.4×10–7 A/cm2). The local scanning electrochemical methods of surface investigation, notably Scanning Vibrating Electrode Technique (SVET) and Scanning Ion-Selective Electrode Technique (SIET) were used for determining the kinetics and mechanism of the self-healing process. The treatment by the solution containing 8-hydroxyquinoline, which inhibits the corrosion process, enables one to increase the protective properties of the composite coating in 30 times in the corrosion-active environment in comparison with the base PEO-coating and avert the intensive destruction of the material.

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A physics-based micromechanical model for electroactive viscoelastic polymers

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x18781036 ◽

2018 ◽

Vol 29 (14) ◽

pp. 2902-2918 ◽

Cited By ~ 2

Author(s):

Roberto Brighenti ◽

Andreas Menzel ◽

Franck J Vernerey

Keyword(s):

Electric Field ◽

Healing Process ◽

Polymer Network ◽

Micromechanical Model ◽

New Physics ◽

Self Healing ◽

Reference Stress ◽

Dependent Behavior ◽

Stress Free State ◽

High Deformability

Electroactive polymers with time-dependent behavior are considered in the present paper by way of a new physics-based micromechanical model; such viscoelastic response is described by the internal evolution of the polymer network, providing a new viewpoint on the stress relaxation occurring in elastomers. The main peculiarity of such internally rearranging materials is their capacity to locally reset their reference stress-free state, leading to a mechanical behavior that relaxes out (eases off) an induced stress state and that can thus be assimilated to a sort of internal self-healing process. Such high deformability and recoverability displayed by dynamically cross-linked polymers can be conveniently exploited when they are coupled in electromechanical problems; the deformation induced by an electric field can be easily tuned by the intensity of the electric field itself and the obtained shape can be maintained without any electric influence once the material microstructure has rearranged after a sufficient curing time. In the present paper, both features of the polymeric material, that is, internal remodeling and electromechanical coupled response, are considered and a theoretical framework is established to simulate representative boundary value problems.

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Microencapsulated healing agents for an elevated-temperature cured epoxy: Influence of viscosity on healing efficiency

Polymers and Polymer Composites ◽

10.1177/09673911211045373 ◽

2021 ◽

pp. 096739112110453

Author(s):

Habibah Ghazali ◽

Lin Ye ◽

Amie N Amir

Keyword(s):

Fracture Toughness ◽

Elevated Temperature ◽

High Performance ◽

Healing Process ◽

Polymer Network ◽

Diglycidyl Ether ◽

The Self ◽

Effect Of Temperature ◽

Mode I ◽

Self Healing

Among many applications, elevated-temperature cured epoxy resins are widely used for high-performance applications especially for structural adhesive and as a matrix for structural composites. This is due to their superior chemical and mechanical properties. The thermosetting nature of epoxy produces a highly cross-linked polymer network during the curing process where the resulting material exhibited excellent properties. However, due to this cross-linked molecular structure, epoxies are also known to be brittle, and once a crack initiated in the material, it is difficult to arrest the crack propagation. Earlier research found that the inclusion of encapsulated healing agents is able to introduce self-healing ability to the room-temperature cured epoxies. The current study investigated the self-healing behaviour of an elevated-temperature cured epoxy, which incorporated the dual-capsule system loaded with diglycidyl-ether of bisphenol-A (DGEBA) resin and mercaptan. The microcapsules were prepared by the in-situ polymerisation method while the fracture toughness and the self-healing capability of the tapered-double-cantilever-beam (TDCB) epoxy specimens were measured under Mode-I fracture toughness testing. We investigated the effect of temperature on viscosity of the healing agents and how these values influence the formation of uniform healing on the fracture surfaces. It was found that incorporation of the dual-capsule self-healing system onto an elevated-temperature cured epoxy slightly changed the fracture toughness of the epoxy as indicated by the Mode-I testing. In the case of thermal healing at 70°C, the self-healing epoxy exhibited a recovery of up to 111% of its original fracture toughness, where a uniform spreading of the healant was observed. The excellent healing behaviour is attributed to the lower viscosity of the healant at higher temperature and the higher glass transition temperature ( Tg) of the produced healant film. The DSC analysis confirmed that the healing process was not contributed by the post-curing of the host epoxy.

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Investigations of Self-Healing Property of Chitosan-Reinforced Epoxy Dye Composite Coatings

Journal of Materials ◽

10.1155/2013/613717 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 5

Author(s):

Hüsnügül Yılmaz Atay ◽

Leyla Eral Doğan ◽

Erdal Çelik

Keyword(s):

Composite Coatings ◽

Healing Process ◽

Primary Objective ◽

The Self ◽

Self Healing ◽

Application Range ◽

Glass Substrates ◽

Different Types ◽

Healing Property ◽

Different Parts

Chitosan has a very wide application range in different parts of life such as in biomedical and antimicrobial areas. In recent years the self-healing property of chitosan becomes more of an issue. In the study chitosan was used to obtain a self-healing composite material. An epoxy dye was converted to a self-healing coating. Different types of samples were prepared by coating the glass substrates with a polymer matrix reinforced with various amounts of chitosan. The samples were characterized by fourier transform Infrared (FTIR) and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). In addition, self-healing test was applied as a primary objective of this research. In this respect, the samples were scratched with a very thin pin, and they were analyzed by SEM periodically. It was observed that chitosan-reinforced dyes showed self-healing property. Mechanism of the self-healing process was also scrutinized.

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A Qualitative Research on Self-healing Process of Brain Education Meditation Discipline

The Journal of Humanities and Social sciences 21 ◽

10.22143/hss21.11.1.58 ◽

2020 ◽

Vol 11 (1) ◽

pp. 789-804

Author(s):

Geonyoung Ko

Keyword(s):

Qualitative Research ◽

Healing Process ◽

Self Healing

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Injectable Self-Healing Adhesive pH-Responsive Hydrogels Accelerate Gastric Hemostasis and Wound Healing

Nano-Micro Letters ◽

10.1007/s40820-020-00585-0 ◽

2021 ◽

Vol 13 (1) ◽

Author(s):

Jiahui He ◽

Zixi Zhang ◽

Yutong Yang ◽

Fenggang Ren ◽

Jipeng Li ◽

...

Keyword(s):

Wound Healing ◽

Endoscopic Treatment ◽

Healing Process ◽

Gelation Time ◽

Type I ◽

Self Healing ◽

Ph Responsive ◽

Gastric Hemorrhage ◽

Wound Model ◽

Arterial Bleeding

AbstractEndoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) are well-established therapeutics for gastrointestinal neoplasias, but complications after EMR/ESD, including bleeding and perforation, result in additional treatment morbidity and even threaten the lives of patients. Thus, designing biomaterials to treat gastric bleeding and wound healing after endoscopic treatment is highly desired and remains a challenge. Herein, a series of injectable pH-responsive self-healing adhesive hydrogels based on acryloyl-6-aminocaproic acid (AA) and AA-g-N-hydroxysuccinimide (AA-NHS) were developed, and their great potential as endoscopic sprayable bioadhesive materials to efficiently stop hemorrhage and promote the wound healing process was further demonstrated in a swine gastric hemorrhage/wound model. The hydrogels showed a suitable gelation time, an autonomous and efficient self-healing capacity, hemostatic properties, and good biocompatibility. With the introduction of AA-NHS as a micro-cross-linker, the hydrogels exhibited enhanced adhesive strength. A swine gastric hemorrhage in vivo model demonstrated that the hydrogels showed good hemostatic performance by stopping acute arterial bleeding and preventing delayed bleeding. A gastric wound model indicated that the hydrogels showed excellent treatment effects with significantly enhanced wound healing with type I collagen deposition, α-SMA expression, and blood vessel formation. These injectable self-healing adhesive hydrogels exhibited great potential to treat gastric wounds after endoscopic treatment.

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Zn-Co-CeO2 vs. Zn-Co Coatings: Effect of CeO2 Sol in the Enhancement of the Corrosion Performance of Electrodeposited Composite Coatings

Metals ◽

10.3390/met11050704 ◽

2021 ◽

Vol 11 (5) ◽

pp. 704

Author(s):

Marija Riđošić ◽

Nebojša D. Nikolić ◽

Asier Salicio-Paz ◽

Eva García-Lecina ◽

Ljiljana S. Živković ◽

...

Keyword(s):

Corrosion Resistance ◽

Healing Rate ◽

Electrochemical Impedance ◽

Composite Coatings ◽

Self Healing ◽

Kelvin Probe ◽

Artificial Defect ◽

Volta Potential ◽

Superior Corrosion Resistance ◽

The Stability

Electrodeposition and characterization of novel ceria-doped Zn-Co composite coatings was the main goal of this research. Electrodeposited composite coatings were compared to pure Zn-Co coatings obtained under the same conditions. The effect of two ceria sources, powder and home-made sol, on the morphology and corrosion resistance of the composite coatings was determined. During the electrodeposition process the plating solution was successfully agitated in an ultrasound bath. The source of the particles was found to influence the stability and dispersity of plating solutions. The application of ceria sol resulted in an increase of the ceria content in the resulting coating and favored the refinement from cauliflower-like morphology (Zn-Co) to uniform and compact coral-like structure (Zn-Co-CeO2 sol). The corrosion resistance of the composite coatings was enhanced compared to bare Zn-Co as evidenced by electrochemical impedance spectroscopy and scanning Kelvin probe results. Zn-Co doped with ceria particles originating from ceria sol exhibited superior corrosion resistance compared to Zn-Co-CeO2 (powder) coatings. The self-healing rate of artificial defect was calculated based on measured Volta potential difference for which Zn-Co-CeO2 (sol) coatings exhibited a self-healing rate of 73.28% in a chloride-rich environment.

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