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Special Issue "Wet Adhesion: New Chemistries, Models and Translation to Materials"

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Materials Science".

Deadline for manuscript submissions: 31 December 2019.

Special Issue Editors

Prof. Dr. Marco d'Ischia
E-Mail Website
Guest Editor
Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126 Naples, Italy
Tel. +39-081-674132
Interests: structure, synthesis, physicochemical properties, and reactivity of melanins; polydopamine and related bioinspired functional materials for underwater surface functionalization and hybrid nanostructures for bioelectronics and biomedical applications; design, antioxidant properties, and reactivity of bioactive phenolic and quinone compounds; free radical oxidations and nature-inspired redox-active systems for biomedical and technological applications; chemistry and physicochemical properties of natural or bioinspired heterocyclic compounds; bioorganic chemistry of organic sulphur and selenium compounds; model reactions and transformation pathways of polycyclic aromatic hydrocarbons and derivatives of astrochemical relevance
Special Issues and Collections in MDPI journals
Dr. Julieta Paez
E-Mail Website
Guest Editor
Leibniz-Institut für Neue Materialien GmbH. Campus D2-2, D-66123, Saarbrücken, Germany
Interests: biomaterials; bioinspired chemistry and materials; tissue adhesives; adhesion under wet conditions; crosslinking; hydrogels; chemical reactions under physiological conditions; catechol chemistry; materials for 3D cell encapsulation; thiol-mediated coupling chemistries; bioinks for 3D bioprinting technologies
Dr. habil. Alla Synytska
E-Mail Website1 Website2
Guest Editor
Department Polymer Interfaces, Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany
Interests: physical chemistry of polymers, colloids, and interfaces; design of soft and hybrid colloids with chemical and geometrical anisotropy; assembly; bioinspired design of soft polymer-based materials with tailored adhesion properties in complex environments (wet, icy); electrokinetic, wetting, and adhesion phenomena at soft interfaces; adhesion testing under water with AFM colloidal probe technique
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

One of the fundamental challenges in materials science is the development of synthetic durable adhesives that perform under wet conditions. Despite the great progress achieved so far, most man-made adhesives deteriorate and ultimately fail in watery environments. Conversely, certain aquatic animals like mussels, sandcastle worms, and freshwater caddisfly larvae have long solved this challenge through evolution. These organisms show impressive underwater adhesion performance and, therefore, provide a source of inspiration for the development of new adhesive materials. Advancing the field of wet adhesives will certainly have a profound industrial and technological impact that spans from medicine, coating technologies, and materials for construction, to additive manufacturing.

In this Special Issue, we aim to bring together contributions from different research groups working in the field of underwater adhesion, within a multidisciplinary approach that combines fundamental chemistry and physics, materials science, and engineering. We are interested in contributions that elucidate the mechanisms of bio-adhesion, extract its main design principles as guidelines for development of synthetic adhesive materials, and promote their application to solve current and emerging challenges in aqueous adhesion.

Prof. Dr. Marco d'Ischia
Dr. Julieta Paez
Dr. habil. Alla Synytska
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Hydrogels, coatings, and adhesives;
  • Bioinspired and biomimetic adhesives;
  • Structure/property/function relationships;
  • Catechol chemistry, complex coacervation;
  • Novel curing and polymerization mechanisms;
  • Novel solutions for industrial applications (adhesive processing, storage, etc.);
  • Biomedical applications;
  • Adhesion on demand;
  • Adhesives from renewable feedstock;
  • Novel characterization techniques of wet adhesive properties;
  • Biochemistry and processing of natural bioadhesives;
  • Theoretical and computational studies, modeling;
  • Multifunctional adhesive materials (self-healing, stimuli-responsive, cell-instructive, antifouling, antioxidant, printable, etc.);
  • Additive manufacturing and biofabrication.

Published Papers (4 papers)

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Research

Open AccessArticle
Thermo-Responsive Polymer Brushes with Side Graft Chains: Relationship Between Molecular Architecture and Underwater Adherence
Int. J. Mol. Sci. 2019, 20(24), 6295; https://doi.org/10.3390/ijms20246295 (registering DOI) - 13 Dec 2019
Abstract
During the last few decades, wet adhesives have been developed for applications in various fields. Nonetheless, key questions such as the most suitable polymer architecture as well as the most suitable chemical composition remain open. In this article, we investigate the underwater adhesion [...] Read more.
During the last few decades, wet adhesives have been developed for applications in various fields. Nonetheless, key questions such as the most suitable polymer architecture as well as the most suitable chemical composition remain open. In this article, we investigate the underwater adhesion properties of novel responsive polymer brushes with side graft chain architecture prepared using “grafting through” approach on flat surfaces. The incorporation in the backbone of thermo-responsive poly(N-isopropylacrylamide) (PNIPAm) allowed us to obtain LCST behavior in the final layers. PNIPAm is co-polymerized with poly(methyl ethylene phosphate) (PMEP), a poloyphosphoester. The final materials are characterized studying the surface-grafted polymer as well as the polymer from the bulk solution, and pure PNIPAm brush is used as reference. PNIPAm-g-PMEP copolymers retain the responsive behavior of PNIPAm: when T > LCST, a clear switching of properties is observed. More specifically, all layers above the critical temperature show collapse of the chains, increased hydrophobicity and variation of the surface charge even if no ionizable groups are present. Secondly, effect of adhesion parameters such as debonding rate and contact time is studied. Thirdly, the reversibility of the adhesive properties is confirmed by performing adhesion cycles. Finally, the adhesive properties of the layers are studied below and above the LCST against hydrophilic and hydrophobic substrates. Full article
(This article belongs to the Special Issue Wet Adhesion: New Chemistries, Models and Translation to Materials)
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Open AccessArticle
Thermoresponsive Catechol Based-Polyelectrolyte Complex Coatings for Controlled Release of Bortezomib
Int. J. Mol. Sci. 2019, 20(23), 6081; https://doi.org/10.3390/ijms20236081 - 02 Dec 2019
Abstract
To overcome the high relapse rate of multiple myeloma (MM), a drug delivery coating for functionalization of bone substitution materials (BSM) is reported based on adhesive, catechol-containing and stimuli-responsive polyelectrolyte complexes (PECs). This system is designed to deliver the MM drug bortezomib (BZM) [...] Read more.
To overcome the high relapse rate of multiple myeloma (MM), a drug delivery coating for functionalization of bone substitution materials (BSM) is reported based on adhesive, catechol-containing and stimuli-responsive polyelectrolyte complexes (PECs). This system is designed to deliver the MM drug bortezomib (BZM) directly to the anatomical site of action. To establish a gradual BZM release, the naturally occurring caffeic acid (CA) is coupled oxidatively to form poly(caffeic acid) (PCA), which is used as a polyanion for complexation. The catechol functionalities within the PCA are particularly suitable to form esters with the boronic acid group of the BZM, which are then cleaved in the body fluid to administer the drug. To achieve a more thorough control of the release, the thermoresponsive poly(N-isoproplyacrylamide-co-dimethylaminoethylmethacrylate) (P(NIPAM-co-DMAEMA)) was used as a polycation. Using turbidity measurements, it was proven that the lower critical solution temperature (LCST) character of this polymer was transferred to the PECs. Further special temperature dependent attenuated total reflection infrared spectroscopy (ATR-FTIR) showed that coatings formed by PEC immobilization exhibit a similar thermoresponsive performance. By loading the coatings with BZM and studying the release in a model system, via UV/Vis it was observed, that both aims, the retardation and the stimuli control of the release, were achieved. Full article
(This article belongs to the Special Issue Wet Adhesion: New Chemistries, Models and Translation to Materials)
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Open AccessArticle
Variable Smear Layer and Adhesive Application: The Pursuit of Clinical Relevance in Bond Strength Testing
Int. J. Mol. Sci. 2019, 20(21), 5381; https://doi.org/10.3390/ijms20215381 - 29 Oct 2019
Abstract
The removal or modification of smear layers that cover the dentin is critical to allow the penetration of adhesive molecules and to ensure a strong bond between resin and dentin. Aiming to establish a model for clinically-relevant dentin-bond testing, we evaluated the effects [...] Read more.
The removal or modification of smear layers that cover the dentin is critical to allow the penetration of adhesive molecules and to ensure a strong bond between resin and dentin. Aiming to establish a model for clinically-relevant dentin-bond testing, we evaluated the effects of smear layers created by abrasives having similar coarseness (180-grit SiC paper; fine-grit diamond bur) and application modes (single application; double application) on the microtensile bond strengths (µTBS) of two currently available universal adhesives (G-Premio Bond; Scotchbond Universal Adhesive) and a two-step self-etch adhesive (Clearfil Megabond 2). Sixty extracted human third molars were used for the μTBS test. Data were analyzed by three-way ANOVA and Tukey’s test (α = 0.05). Fracture modes were determined using stereomicroscopy. An additional 24 third molars were prepared for observation of the resin–dentin interface by TEM and adhesive-smear layer interaction by SEM. μTBS was significantly affected by the adhesives and their application modes (p < 0.001), implying that the double application of universal adhesives should be recommended to improve their performance. The effect of smear layers was not significant (p > 0.05), indicating that 180-grit SiC papers could be used to prepare dentin as a substitute for fine-grit diamond burs for dentin-bond testing in laboratory settings. Full article
(This article belongs to the Special Issue Wet Adhesion: New Chemistries, Models and Translation to Materials)
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Open AccessArticle
Reaction-Based, Fluorescent Film Deposition from Dopamine and a Diamine-Tethered, Bis–Resorcinol Coupler
Int. J. Mol. Sci. 2019, 20(18), 4532; https://doi.org/10.3390/ijms20184532 - 13 Sep 2019
Abstract
The reaction-based deposition on various surfaces of an all-organic fluorescent coating is reported here, involving autoxidation of 2 mM dopamine in carbonate buffer at pH 9.0, in the presence of a 1 mM diamine–resorcinol coupler (Bis–Res) prepared from 2,4-dihydroxybenzaldehyde and hexamethylenediamine (HMDA). Spectral [...] Read more.
The reaction-based deposition on various surfaces of an all-organic fluorescent coating is reported here, involving autoxidation of 2 mM dopamine in carbonate buffer at pH 9.0, in the presence of a 1 mM diamine–resorcinol coupler (Bis–Res) prepared from 2,4-dihydroxybenzaldehyde and hexamethylenediamine (HMDA). Spectral analysis of the films coupled with an LC-MS investigation of the yellow fluorescent mixture was compatible with the formation and deposition of HMDA-linked methanobenzofuroazocinone fluorophores. Both the emission properties and hydrophobicity of the film were abated in a reversible manner following exposure to acid vapors. These results provide an entry to efficient and practical fluorescent coating methodologies based on in situ generation and the deposition of wet adhesive, as well as fluorescent materials combining a strongly emitting fluorophore with the film-forming properties of long chain diamines. Full article
(This article belongs to the Special Issue Wet Adhesion: New Chemistries, Models and Translation to Materials)
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