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Coatings
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Natural Materials in Functional Coatings
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Natural Materials in Functional Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Bioactive Coatings and Biointerfaces".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 34712

Special Issue Editors

Dr. Radu Claudiu Fierascu

E-Mail Website1 Website2
Guest Editor
National Institute for Research and Development in Chemistry and Petrochemistry, ICECHIM, 060021 Bucharest, Romania
Interests: nanoparticles phytosynthesis; natural extracts; biological properties
Special Issues, Collections and Topics in MDPI journals
Dr. Irina Fierascu

E-Mail Website1 Website2
Guest Editor
1. National Institute for Research & Development in Chemistry and Petrochemistry - ICECHIM, Bucharest, Romania
2. Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, Bucharest, Romania
Interests: nanomaterials; nanoparticles; analytical methods; biosynthesis; cultural heritage; archaeometry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue on “Natural Materials in Functional Coatings” would like to inspire researchers all over to world to contribute with their most exciting results in the area of natural materials (extracts, essential oils, individual compounds isolated from natural sources) for the development of functional coatings.

Nature reserves continues to surprise us regarding the properties and possible applications of natural materials. With the development of modern extraction methods (and the analytical tools necessary for their characterization), we are slowly rediscovering the potential of natural products. The incorporation of natural materials will offer not only “greener” alternatives for the coatings area but could also enhance their properties.

The term “functional coatings” will cover both their intrinsic functionality (such as, for example, superhydrophobicity, antimicrobial, antifouling, antireflective radar absorbing properties, and self-stratification, conductivity) and stimuli responsive functionality (such as thermochromic, color shifting, touch sensitive, corrosion- and explosive-resistant, self-healing, shape-memory materials, etc.).

Regardless of whether we are speaking of antimicrobial coatings for biomedical applications, coatings for increasing the shelf-life of commercial products, or coatings for the conservation of cultural heritage artifacts, and so on, the selected area will offer the interested reader an overlook of the recent developments recorded in recent years.

Original research and review papers are welcomed in the following topics (though not exclusively):

  • Natural materials in antimicrobial coatings;
  • Natural materials used in coatings for increasing the commercial products’ shelf-life;
  • Natural materials for the development of protective coatings in cultural heritage applications;
  • Natural materials for other functional coatings.

The works submitted to the Special Issue should contain details on the obtaining/characterization of the natural materials, incorporation in functional coatings, as well as the demonstration of the coatings’ properties.

Dr. Radu Claudiu Fierascu
Dr. Irina Fierascu
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 submissions that pass pre-check are 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. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). 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

  • natural materials
  • functional coatings
  • organic and inorganic coatings
  • antimicrobial coatings
  • protective coatings

Published Papers (6 papers)

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Research

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13 pages, 3250 KiB  
Article
Chitosan Solution Containing Zein and Essential Oil as Bio Based Coating on Packaging Paper
by Urška Vrabič Brodnjak and Katarina Tihole
Coatings 2020, 10(5), 497; https://doi.org/10.3390/coatings10050497 - 22 May 2020
Cited by 28 | Viewed by 4913
Abstract
Modifications of the packaging paper surface play an important role in a variety of industries, especially in the food sector. Uncoated paper has poor water and oil barrier properties due to its porous structure. In this study, packaging paper was successfully coated with [...] Read more.
Modifications of the packaging paper surface play an important role in a variety of industries, especially in the food sector. Uncoated paper has poor water and oil barrier properties due to its porous structure. In this study, packaging paper was successfully coated with six different coating solutions containing combinations of chitosan, zein and rosemary essential oil. The chitosan and zein were actually coated in two layers; the mixed chitosan–rosemary oil and the mixed zein–rosemary oil were each applied as one layer to the paper. The results showed increased oil barrier properties in the papers coated with mixed zein–rosemary oil and reduced water permeability in the papers coated with the chitosan–rosemary oil coating solution. The result of this two-layer coating showed excellent water (Cobb60 value of 2.18 g/m2) and oil barrier properties. All the coated papers showed a high thermal stability, especially those coated with chitosan, zein and rosemary oil layer by layer. Scanning electron microscopy was used to verify the surface differences of the coated papers, such as the closed structure, pores and smoother surface, especially in the layer-wise coated samples. Due to their good mechanical and chemical properties, coated papers with rosemary oil can be used in many applications, possibly also in the field of repellents. Full article
(This article belongs to the Special Issue Natural Materials in Functional Coatings)
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18 pages, 6395 KiB  
Article
Biomimetic Sensitive Elements for 2,4,6-Trinitrotoluene Tested on Multi-Layered Sensors
by Ana Mihaela GAVRILA, Tanta Verona IORDACHE, Carmen LAZAU, Traian ROTARIU, Ileana CERNICA, Hermine STROESCU, Mihai STOICA, Corina ORHA, Cornelia Elena BANDAS and Andrei SARBU
Coatings 2020, 10(3), 273; https://doi.org/10.3390/coatings10030273 - 15 Mar 2020
Cited by 7 | Viewed by 2741
Abstract
In spite of technological progress, most of the current techniques for 2,4,6-trinitrotoluene (TNT) detection are time consuming due to laborious sensor preparation. Thereby, the aim of this work was to enlarge the knowledge for preparing sensitive elements for TNT with the aid of [...] Read more.
In spite of technological progress, most of the current techniques for 2,4,6-trinitrotoluene (TNT) detection are time consuming due to laborious sensor preparation. Thereby, the aim of this work was to enlarge the knowledge for preparing sensitive elements for TNT with the aid of molecular imprinting; a known technique used to deliver biomimetic materials. The study first depicts the auto-assembly mechanism of (TNT) with functional diamino-silanes (i.e., N-(2-aminoethyl)-3-aminopropyl methyl dimethoxysilane), via “double” Meisenheimer complexes. This mechanism is being described herein for the first time and applied further to obtain molecularly imprinted polymer (MIP) films for TNT recognition. For testing the potential application of films as chemical sensor elements, typical rebinding assays of TNT in a liquid state and the rebinding of TNT in a vapor state, using multilayered sensor chips composed of quartz-chromium (Cr)-gold (Au)-titanium oxide (TiO2), were employed. Batch rebinding experiments have shown that thinner films were more efficient on retaining TNT molecules in the first five min, with a specificity of about 1.90. The quartz-Cr-Au-TiO2-MIP capacitive sensors, tested in vapor state, registered short response times (less than 25 s), low sensitivity to humidity and high specificity for TNT. Full article
(This article belongs to the Special Issue Natural Materials in Functional Coatings)
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Review

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22 pages, 2819 KiB  
Review
Curcumin: Modern Applications for a Versatile Additive
by Florentina Monica Raduly, Valentin Raditoiu, Alina Raditoiu and Violeta Purcar
Coatings 2021, 11(5), 519; https://doi.org/10.3390/coatings11050519 - 28 Apr 2021
Cited by 29 | Viewed by 5340
Abstract
The recent development of several methods for extracting curcumin from the root of the plant Curcuma longa has led to intensified research on the properties of curcumin and its fields of application. Following the studies and the accreditation of curcumin as a natural [...] Read more.
The recent development of several methods for extracting curcumin from the root of the plant Curcuma longa has led to intensified research on the properties of curcumin and its fields of application. Following the studies and the accreditation of curcumin as a natural compound with antifungal, antiviral, and antibacterial properties, new fields of application have been developed in two main directions—food and medical, respectively. This review paper aims to synthesize the fields of application of curcumin as an additive for the prevention of spoilage, safety, and quality of food. Simultaneously, it aims to present curcumin as an additive in products for the prevention of bacterial infections and health care. In both cases, the types of curcumin formulations in the form of (nano)emulsions, (nano)particles, or (nano)composites are presented, depending on the field and conditions of exploitation or their properties to be used. The diversity of composite materials that can be designed, depending on the purpose of use, leaves open the field of research on the conditioning of curcumin. Various biomaterials active from the antibacterial and antibiofilm point of view can be intuited in which curcumin acts as an additive that potentiates the activities of other compounds or has a synergistic activity with them. Full article
(This article belongs to the Special Issue Natural Materials in Functional Coatings)
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23 pages, 1534 KiB  
Review
Natural Ingredients in Functional Coatings—Recent Advances and Future Challenges
by Radu Claudiu Fierascu, Irina Fierascu and Irina Elena Chican
Coatings 2021, 11(4), 429; https://doi.org/10.3390/coatings11040429 - 7 Apr 2021
Cited by 5 | Viewed by 3855
Abstract
In recent decades, coating materials have gained researchers’ interest, finding applications in different areas such as antimicrobial coatings for biomedical applications, coatings for increasing the shelf-life of commercial products, or coatings for the conservation of cultural heritage artifacts. The use of new types [...] Read more.
In recent decades, coating materials have gained researchers’ interest, finding applications in different areas such as antimicrobial coatings for biomedical applications, coatings for increasing the shelf-life of commercial products, or coatings for the conservation of cultural heritage artifacts. The use of new types of coating materials based on natural ingredients can lead to the removal of harmful chemicals and contribute to the development of materials having different and promising properties. New challenges can appear both in the production process, as well as in the case of final application, when coating materials must be applied on various supports. The present review paper aims to be a critical discussion regarding the possibility of using natural ingredients as functional coatings, and to prove that the same material can be used in different fields, from the biomedical to environmental, or from cultural heritage protection to the food and cosmetic industries. The paper is based on the newest published studies, and its main goal is to be an inspiration source for researchers, in order to create more functional and applicable composite coatings in specific fields. Full article
(This article belongs to the Special Issue Natural Materials in Functional Coatings)
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22 pages, 1235 KiB  
Review
Smart Food Packaging Designed by Nanotechnological and Drug Delivery Approaches
by Ludmila Motelica, Denisa Ficai, Ovidiu Cristian Oprea, Anton Ficai and Ecaterina Andronescu
Coatings 2020, 10(9), 806; https://doi.org/10.3390/coatings10090806 - 20 Aug 2020
Cited by 38 | Viewed by 5977
Abstract
This paper offers a general view of the solutions that are able to confer bioactivity to the packaging materials, especially antimicrobial and antioxidant activity. These properties can be induced by the nature of the polymers blend or due to the addition of ternary [...] Read more.
This paper offers a general view of the solutions that are able to confer bioactivity to the packaging materials, especially antimicrobial and antioxidant activity. These properties can be induced by the nature of the polymers blend or due to the addition of ternary components from natural agents (essential oils or other extracts) to synthetic organic and inorganic agents, including nanoparticles with a broad antimicrobial activity such as metals (e.g., Ag, Au, Cu) or metal oxide (e.g., TiO2, ZnO) nanoparticles, and even bacterial cells such as probiotics. Many times, these components are synergistically used, each of them assuring a specific role or potentiating the role of the other components. The antimicrobial activity can be induced due to the applied coatings or due to the whole bulk material. Along with an increasing food stability which means a longer shelf-life some smart packaging can be exploited in order to highlight the freshness of the food. These act as a sensor (usually pH sensitive but also other mechanisms can be exploited such as aggregation/agglomeration of AuNPs leading to color change or even aldehyde-specific reactions such as the Cannizzaro reaction), and thus, consumers can be confident about the freshness of the food, especially perishable food such as seafood or fish. Full article
(This article belongs to the Special Issue Natural Materials in Functional Coatings)
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48 pages, 4916 KiB  
Review
Edible and Functionalized Films/Coatings—Performances and Perspectives
by Sorin Marius Avramescu, Claudia Butean, Claudia Valentina Popa, Alina Ortan, Ionut Moraru and Georgeta Temocico
Coatings 2020, 10(7), 687; https://doi.org/10.3390/coatings10070687 - 16 Jul 2020
Cited by 56 | Viewed by 10460
Abstract
In recent years, food packaging has evolved from an inert and polluting waste that remains after using the product toward an active item that can be consumed along with the food it contains. Edible films and coatings represent a healthy alternative to classic [...] Read more.
In recent years, food packaging has evolved from an inert and polluting waste that remains after using the product toward an active item that can be consumed along with the food it contains. Edible films and coatings represent a healthy alternative to classic food packaging. Therefore, a significant number of studies have focused on the development of biodegradable enveloping materials based on biopolymers. Animal and vegetal proteins, starch, and chitosan from different sources have been used to prepare adequate packaging for perishable food. Moreover, these edible layers have the ability to carry different active substances such as essential oils—plant extracts containing polyphenols—which bring them considerable antioxidant and antimicrobial activity. This review presents the latest updates on the use of edible films/coatings with different compositions with a focus on natural compounds from plants, and it also includes an assessment of their mechanical and physicochemical features. The plant compounds are essential in many cases for considerable improvement of the organoleptic qualities of embedded food, since they protect the food from different aggressive pathogens. Moreover, some of these useful compounds can be extracted from waste such as pomace, peels etc., which contributes to the sustainable development of this industry. Full article
(This article belongs to the Special Issue Natural Materials in Functional Coatings)
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