Bioinspired surface activators for wet/dry environments through greener epoxy-catechol amine chemistry

Baby, Monisha; Periya, Vijayalakshmi K.; Sankaranarayanan, Santhosh Kumar Kalamblayil; Chandran, M. Satheesh

doi:10.1016/j.apsusc.2019.144414

Cited by 15 publications

(10 citation statements)

References 59 publications

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“…A detailed literature review in the relevant domain is carried out, and the adhesive strength of the current system vis-à-vis other systems is presented in Table S7. The value reported in the present study is the highest for an underwater bonding adhesive, comparable to the primer-based adhesives reported in our previous report . No appreciable change is noted for the specimens bonded under seawater and distilled water.…”

Section: Results and Discussionsupporting

confidence: 84%

“…reported epoxy-dopamine-based primers for SS substrates, with improved performance under wet conditions as well as after exposure to hot water . In our earlier study, we reported dopamine-functionalized epoxy primers as moisture-resistant coatings with an underwater bonding strength of 7–7.5 MPa . North et al reported poly(catechol-styrene)-based adhesives with the highest reported underwater bonding strength of 3 MPa on an Al substrate …”

Section: Introductionmentioning

confidence: 82%

“…33 In our earlier study, we reported dopamine-functionalized epoxy primers as moistureresistant coatings with an underwater bonding strength of 7−7.5 MPa. 34 North et al reported poly(catechol-styrene)-based adhesives with the highest reported underwater bonding strength of 3 MPa on an Al substrate. 35 In this study, we demonstrated a novel liquid marble technology as an efficient way to mimic the formation of coacervates that in turn help achieve strong underwater adhesion.…”

Section: ■ Introductionmentioning

confidence: 99%

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Catechol-Amine-Decorated Epoxy Resin as an Underwater Adhesive: A Coacervate Concept Using a Liquid Marble Strategy

Baby

Bhaskaran²,

Chandran³

2023

ACS Omega

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The attachment phenomena of various hierarchical architectures found in nature, especially underwater adhesion, have drawn extensive attention to the development of similar biomimicking adhesives. Marine organisms show spectacular adhesion characteristics because of their foot protein chemistry and the formation of an immiscible phase (coacervate) in water. Herein, we report a synthetic coacervate derived using a liquid marble route composed of catechol amine-modified diglycidyl ether of bisphenol A (EP) polymers wrapped by silica/PTFE powders. The adhesion promotion efficiency of catechol moieties is established by functionalizing EP with monofunctional amines (MFA) of 2-phenyl ethylamine and 3,4-dihydroxy phenylethylamine (DA). The curing activation of MFA-incorporated resin pointed toward a lower activation energy (50.1−52.1 kJ mol −1 ) compared with the neat system (56.7−58 kJ mol −1 ). The viscosity build-up and gelation are faster for the catechol-incorporated system, making it ideal for underwater bonding performance. The PTFE-based adhesive marble of the catechol-incorporated resin was stable and exhibited an adhesive strength of 7.5 MPa under underwater bonding conditions.

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Section: Results and Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 82%

Section: ■ Introductionmentioning

confidence: 99%

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Catechol-Amine-Decorated Epoxy Resin as an Underwater Adhesive: A Coacervate Concept Using a Liquid Marble Strategy

Baby

Bhaskaran²,

Chandran³

2023

ACS Omega

Self Cite

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“…However, artificial catechol-based hydrogels are generally too simple considering their chemical composition and grade structure, resulting in poor mechanical strengths and bonding strengths [12,70,120,[129][130][131][132][133][134]. As mentioned before, catechol groups are easily occupied by metal ions on the nonmatrix and are oxidised to quinone groups; thus, the hydrogen bond interaction playing the key adhesion role is weakened [14][15][16][17][18][19][20][21][22][23][24][25][26]. However, mussel adhesion proteins can form strong adhesions in aqueous media.…”

Section: Musselmentioning

confidence: 99%

“…Hydrogel is a hydrophilic polymeric network of three‐dimensional (3D) cross‐linked structures that retain a significant amount of water [1, 2]. The soft swollen polymer networks formed as a result of physical or chemical cross‐linking show hydrophobic effects [2], electrostatic interactions [2–5], hydrogen bond interactions [6, 7], covalent bonds [8–11], and metal coordination chemistry [12–34]. Hydrogels can be tailored to achieve various cross‐linking densities, mechanical properties, and porous structures through various cross‐linking mechanisms and functional groups.…”

Section: Introductionmentioning

confidence: 99%

Natural polymer‐based adhesive hydrogel for biomedical applications

Long

Xie

2022

Biosurface and Biotribology

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Hydrogel is a polymer network system that can form a hydrophilic three‐dimensional network structure through different cross‐linking methods. In recent years, hydrogels have received considerable attention due to their good biocompatibility and biodegradability by introducing different cross‐linking mechanisms and functional components. Compared with synthetic hydrogels, natural polymer‐based hydrogels have low biotoxicity, high cell affinity, and great potential for biomedical fields; however, their mechanical properties and tissue adhesion capabilities have been unable to meet clinical requirements. In recent years, many efforts have been made to solve these issues. In this review, the recent progress in the field of natural polymer‐based adhesive hydrogels is highlighted. The authors first introduce the general design principles for the natural polymer‐based adhesive hydrogels being used as excellent tissue adhesives and the challenges associated with their design. Next, their usages in biomedical applications are summarised, such as wound healing, haemostasis, nerve repair, bone tissue repair, cartilage tissue repair, electronic devices, and other tissue repairs. Finally, the potential challenges of natural polymer‐based adhesive hydrogels are presented.

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Biocompatible Film‐Coating of Magnetic Soft Robots for Mucoadhesive Locomotion

Wang

Mzyk

Schirhagl

et al. 2023

Adv Materials Technologies

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Magnetically‐actuated soft robots for medical applications are required to be functional, biocompatible, as well as capable of robust motion inside human organs. In this paper, a ring‐shaped magnetic soft robot, with a flexible biopolymeric film coating, capable of motion on mucus‐coated surfaces is designed and investigated. The biopolymeric film made from chitosan–glycerol (C–G) solution endows the robot with robust locomotion capabilities on surfaces of diverse geometrical shapes and orientations. By utilizing mucoadhesive locomotion, the robot has the potential to carry out clinical procedures on enclosed mucus‐coated tissue surfaces. Material characterization shows that the mucoadhesion increases with the increase of contact times and/or preload forces. The softness of the C–G film can be adjusted by controlling the concentration of glycerol. The ring‐shaped design and magnetization profile decouple the locomotion and functions of the robot. Additionally, the C–G film‐coated robot is tested to be biocompatible for a human colorectal adenocarcinoma cell line with epithelial morphology (HT29). The C–G film reduces the negative effects (superoxide generation) of ferromagnetic particles. Three robot functions including pick‐and‐place, cargo transportation, and liquid capsule release are demonstrated on different surfaces to show the maneuverability, functionality, and potential of implementing clinical procedures through mucoadhesion.

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Bioinspired surface activators for wet/dry environments through greener epoxy-catechol amine chemistry

Cited by 15 publications

References 59 publications

Catechol-Amine-Decorated Epoxy Resin as an Underwater Adhesive: A Coacervate Concept Using a Liquid Marble Strategy

Catechol-Amine-Decorated Epoxy Resin as an Underwater Adhesive: A Coacervate Concept Using a Liquid Marble Strategy

Natural polymer‐based adhesive hydrogel for biomedical applications

Biocompatible Film‐Coating of Magnetic Soft Robots for Mucoadhesive Locomotion

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