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Advanced Surface Coating of Nanoparticles
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Advanced Surface Coating of Nanoparticles

A topical collection in Coatings (ISSN 2079-6412). This collection belongs to the section "Environmental Aspects in Colloid and Interface Science".

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Editors

Prof. Dr. Frank Alexis

E-Mail Website
Guest Editor
1. Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
2. School of Biological Sciences and Engineering, Yachay TechSan Miguel de Urcuquí, Ecuador
Dr. Patrick Tang Siah Ying

E-Mail Website
Guest Editor
Chemical Engineering Discipline, School of Engineering, Monash University, Jalan Lagoon Selatan, Bandar Sunway, Selangor 47500, Malaysia
Interests: sonochemistry; colloid and polymers; nanomaterials; rubber technology
Special Issues, Collections and Topics in MDPI journals

Topical Collection Information

Dear Colleagues,

We would like to invite you to submit your work to this Special Issue on "Advanced Surface Coating of Nanoparticles". Generally, surface coatings of nanomaterials are applied in order to selectively change or influence their properties. For this purpose, the surface of a particle (the “core“) can be coated, which, in return, generates single- or multi-layers layer(s) (the “shell”) that can be either complete or incomplete. Surface coating of nanoparticles includes modification, functionalization, or stabilization to enhance their imaging, drug delivery, stability, antireflection, anticorrosion, antifogging, UV resistant, prevent sulfurization, anti microbial, self-cleaning, biological response, biocompatibility, safety, reactivity properties etc. These coated nanomaterials have electronics, military, energy, biomedical, environmental, textile, automotive, and aerospace applications. The aim of this Special Issue is to present the latest developments in the field of coating nanoparticles, through a combination of original research papers and review articles from leading groups around the world.

In particular, the topics of interest include, but are not limited to:

  • Organic/inorganic coating combinations on nanoparticles;
  • Single/Multiple layer coatings on nanoparticles;
  • Biological coatings on nanoparticles;
  • Janus coatings on nanoparticles;
  • Manufactoring technologies to coat nanoparticles.

Prof. Dr. Frank Alexis
Dr. Patrick Tang Siah Ying
Guest Editors

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Published Papers (15 papers)

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2022

Jump to: 2021, 2019, 2018

31 pages, 3274 KiB  
Review
Nanoantioxidants: The Fourth Generation of Antioxidants—Recent Research Roadmap and Future Perspectives
by Syed Tawab Shah, Zaira Zaman Chowdhury, Khanom Simarani, Wan Jefrey Basirun, Irfan Anjum Badruddin, Mohamed Hussien, Hussein Alrobei and Sarfaraz Kamangar
Coatings 2022, 12(10), 1568; https://doi.org/10.3390/coatings12101568 - 17 Oct 2022
Cited by 5 | Viewed by 2411
Abstract
Antioxidants work by interacting with free radicals and converting them into harmless chemicals, interfering with the progression of potentially hazardous chain reactions. Antioxidants are useful in treating illnesses induced by free radicals because they help minimize oxidative stress. Antioxidants, whether natural or synthetic, [...] Read more.
Antioxidants work by interacting with free radicals and converting them into harmless chemicals, interfering with the progression of potentially hazardous chain reactions. Antioxidants are useful in treating illnesses induced by free radicals because they help minimize oxidative stress. Antioxidants, whether natural or synthetic, have a limited effect on cellular health and function because of their low absorption, inability to traverse cellular membrane, and disintegration during delivery. The benefits of antioxidants, both natural and synthetic, are comparable. The use of antioxidants that are covalently attached to nanoparticles, or encased in particles with a hollow center, or feature the nanomaterial encapsulation of various origins has been employed to solve these challenges to provide improved stability, slow and slow sustained release, biocompatibility, and targeted administration. This review examines the importance of metal-based antioxidants and methods for enhancing antioxidant activities based on recent studies. Full article
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13 pages, 9551 KiB  
Article
SEM-EDX Analysis of Metal Particles Deposition from Surgical Burs after Implant Guided Surgery Procedures
by Giovanni Falisi, Giordano Foffo, Marco Severino, Carlo Di Paolo, Serena Bianchi, Sara Bernardi, Davide Pietropaoli, Sofia Rastelli, Roberto Gatto and Gianluca Botticelli
Coatings 2022, 12(2), 240; https://doi.org/10.3390/coatings12020240 - 12 Feb 2022
Cited by 7 | Viewed by 2578
Abstract
The preparation of the implant site in guided surgery procedure takes place without irrigation, which could lead to increased friction of the drills with the formation and release of debris or metal particles. The presence of metal particles in the peri-implant tissue could [...] Read more.
The preparation of the implant site in guided surgery procedure takes place without irrigation, which could lead to increased friction of the drills with the formation and release of debris or metal particles. The presence of metal particles in the peri-implant tissue could represent a trigger for macrophage activity, bone resorption processes, and consequent implant loss. According to the guided surgical protocol, the study aimed to evaluate the presence of metal particles deposited during implant site preparation. Twenty-five adult porcine ribs from the same adult individual were chosen due to their trabecular bone structure, similar to facial bones. The samples were all 8 cm (length) × 3 cm (depth) × 2 cm (width) and were further subdivided to obtain 50 elements of 4 cm × 3 cm × 2 cm. Plexiglass was used to create structures such as surgical guides so that their function could be mimicked, and the guided implant site preparation sequence could be performed with them. The drill kit used in this study is a guided surgery drill kit characterized by high wear resistance, high yield strength, and good corrosion resistance. This same kit was used 50 times in this way to prepare 50 different implant sites and evaluated at different edges and number of preparation (T0-neutral edge, T1-1 full preparation, T2-10, T3-20, T4-30, T5-40, and T6-50) by SEM-EDX to assess the presence of any metal deposition. The presence of metal residues in the implant site increased according to the cycles of use of the drills. We have observed that in the first three groups, there is no presence of metals. This is evident in groups T3 and T4. Finally, the presence of metal residues becomes significant in the study’s last two groups of samples. The study highlighted how the lack of irrigation in the work site leads the deposition of metal particles and in addition to a reduction in the efficiency of the drills, resulting in less precise cutting, altering the shape of the prepared site, and, lastly, reducing the primary stability of the implants. Full article
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2021

Jump to: 2022, 2019, 2018

13 pages, 4137 KiB  
Article
Effect of Low Magnetic Field on Biomimetic Deposition of Hydroxyapatite on Titanium and BIOLINE Stainless Steel
by Rafael Uribe, Andrea Uvillús, Omar Bonilla, Luis Lascano and Gema González
Coatings 2021, 11(12), 1484; https://doi.org/10.3390/coatings11121484 - 02 Dec 2021
Cited by 3 | Viewed by 1713
Abstract
In this work, we evaluated the effect of a low magnetic field on the deposition of hydroxyapatite (HAp) on different metallic substrates. The substrates studied were titanium and BIOLINE stainless steel SS316LVM with and without Ta and TaN/Ta coatings. Before deposition, the uncoated [...] Read more.
In this work, we evaluated the effect of a low magnetic field on the deposition of hydroxyapatite (HAp) on different metallic substrates. The substrates studied were titanium and BIOLINE stainless steel SS316LVM with and without Ta and TaN/Ta coatings. Before deposition, the uncoated Ti and SS316LVM substrates were treated with alkali to improve the adhesion of the films prompted to be formed. Next, all substrates (coated and uncoated) were immersed in stimulated body fluid (SBF) at physiological conditions of 37 °C, pH = 7.4, in the presence of magnetic fields from 0.15 T and 0.22 T for 7, 10, and 14 days. The formed films were characterized using SEM, FTIR, and the contact angle. Ti and SS316LVM substrates presented Ca/P relations closer to the stoichiometric HAp. It was demonstrated that in both coatings, Ta and Ta/N, an increase of the bioactivity was obtained. Additionally, our results showed that the application of magnetic fields has a significant effect on the increment in the mass:area ratio of HAp. Finally, the contact angle values were lower than 90°, showing an increase in hydrophilicity with respect to the metallic substrates. Full article
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56 pages, 9373 KiB  
Review
Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article
by Aysha Bukhari, Irfan Ijaz, Ezaz Gilani, Ammara Nazir, Hina Zain, Ramsha Saeed, Saleh S. Alarfaji, Sajjad Hussain, Rizwana Aftab and Yasra Naseer
Coatings 2021, 11(11), 1374; https://doi.org/10.3390/coatings11111374 - 09 Nov 2021
Cited by 43 | Viewed by 12282
Abstract
Nanotechnology emerged as a scientific innovation in the 21st century. Metallic nanoparticles (metal or metal oxide nanoparticles) have attained remarkable popularity due to their interesting biological, physical, chemical, magnetic, and optical properties. Metal-based nanoparticles can be prepared by utilizing different biological, physical, and [...] Read more.
Nanotechnology emerged as a scientific innovation in the 21st century. Metallic nanoparticles (metal or metal oxide nanoparticles) have attained remarkable popularity due to their interesting biological, physical, chemical, magnetic, and optical properties. Metal-based nanoparticles can be prepared by utilizing different biological, physical, and chemical methods. The biological method is preferred as it provides a green, simple, facile, ecofriendly, rapid, and cost-effective route for the green synthesis of nanoparticles. Plants have complex phytochemical constituents such as carbohydrates, amino acids, phenolics, flavonoids, terpenoids, and proteins, which can behave as reducing and stabilizing agents. However, the mechanism of green synthesis by using plants is still highly debatable. In this report, we summarized basic principles or mechanisms of green synthesis especially for metal or metal oxide (i.e., ZnO, Au, Ag, and TiO2, Fe, Fe2O3, Cu, CuO, Co) nanoparticles. Finally, we explored the medical applications of plant-based nanoparticles in terms of antibacterial, antifungal, and anticancer activity. Full article
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15 pages, 2173 KiB  
Article
Effective Detoxification of Aflatoxin B1 and Ochratoxin A Using Magnetic Graphene Oxide Nanocomposite: Isotherm and Kinetic Study
by Atena Abbasi Pirouz, Jinap Selamat, Rashidah Sukor and Nuzul Noorahya Jambari
Coatings 2021, 11(11), 1346; https://doi.org/10.3390/coatings11111346 - 02 Nov 2021
Cited by 6 | Viewed by 3567
Abstract
One of the approaches for reducing exposure to mycotoxins is to lessen their bioavailability by applying nanocomposite adsorbents. Magnetic graphene oxide (MGO) is a new class of nanostructured multifunctional nanocomposite materials, which play a vital role as an adsorbent. The primary aim of [...] Read more.
One of the approaches for reducing exposure to mycotoxins is to lessen their bioavailability by applying nanocomposite adsorbents. Magnetic graphene oxide (MGO) is a new class of nanostructured multifunctional nanocomposite materials, which play a vital role as an adsorbent. The primary aim of this study is to apply response surface methodology (RSM) to optimize the influence of pH within the range of 3 to 7, time (3–7 h), and temperature (30–50 °C), on the simultaneous detoxification of aflatoxin B1 (AFB1) and ochratoxin A (OTA) by using MGO. The optimal condition was obtained at pH 5, 5 h, and 40 °C. Further investigation of the adsorption evaluation was carried out by studying different parameters, such as the influence of contact time, initial mycotoxins concentration, and temperature. According to the experimental data, it can be concluded that the pseudo-second-order kinetic model and the Freundlich isotherm fitted well. The capability of adsorption for the Freundlich model was calculated as 153 and 95 ng/g for AFB1 and OTA, respectively. The thermodynamic study showed that the sorption studies act spontaneously as an exothermic process. These findings suggest that the application of MGO as a nanocomposite is of great significance for the detoxification of mycotoxins. Full article
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19 pages, 6802 KiB  
Article
Biogenesis of Silver Nanoparticles and Its Multifunctional Anti-Corrosion and Anticancer Studies
by Leena V. Hublikar, Sharanabasava V. Ganachari, Narasimha Raghavendra, Nagaraj R. Banapurmath, Veerabhadragouda B. Patil, T. M. Yunus Khan and Irfan Anjum Badruddin
Coatings 2021, 11(10), 1215; https://doi.org/10.3390/coatings11101215 - 04 Oct 2021
Cited by 14 | Viewed by 2485
Abstract
In the present research, silver nanoparticles were synthesized using ground nutshell and characterized using UV-visible, FTIR and PXRD. The SEM and HR-TEM aided in confirming the nano size, surface morphology and phase purity of the AgNPs. The quantum chemical, electrochemical, and structural studies [...] Read more.
In the present research, silver nanoparticles were synthesized using ground nutshell and characterized using UV-visible, FTIR and PXRD. The SEM and HR-TEM aided in confirming the nano size, surface morphology and phase purity of the AgNPs. The quantum chemical, electrochemical, and structural studies were carried out to understand electrochemical properties. In addition, biological study such as anti-cancerous activity was carried out, and IC-50 values 80.25 µg/mL for A549 lung cancer cell lines. The effective electrochemical anti-corrosion activities were also studied. The majority constituents of ground nutshell are flavonoids, in a small quantity of alkaloids and phenolic acids, which provide more stability to synthesize silver nanoparticles and avoid agglomeration. These functional moieties enhance the unique properties in the field, as in drug delivery systems, magnetic applications, and metallic, semi-conducting core-shell nanoparticles. Full article
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16 pages, 12962 KiB  
Article
Characterization of Pure Rutile Titania Nanoparticle Prepared by Feasible Method for Coatings and Visible Light-Driven Dye Removal Application
by Jothi Ramalingam Rajabathar, Hamad A. Al-Lohedan, Selvaraj Arokiyaraj, Zuheir A. Issa, Chandra Sekhar Dash, Sundararajan Murugesan, Shaik K. Khadheer Pasha, Dhaifallah M. Al-dhayan and Jimmy Nelson Appaturi
Coatings 2021, 11(10), 1150; https://doi.org/10.3390/coatings11101150 - 23 Sep 2021
Cited by 6 | Viewed by 2353
Abstract
The pure phase of rutile titanium dioxide or titania (R-TiO2) was prepared by means of a strong acidic sol–gel process followed by treatment using a hydrothermal method. The as-prepared titania nanoparticles existed purely in the rutile phase instead of the mixed [...] Read more.
The pure phase of rutile titanium dioxide or titania (R-TiO2) was prepared by means of a strong acidic sol–gel process followed by treatment using a hydrothermal method. The as-prepared titania nanoparticles existed purely in the rutile phase instead of the mixed anatase phase of the respective titania (R-TiO2). The optimized reaction condition and precursor usage were the critical parameters for the formation of the particle size and uniform crystallinity of the rutile phase of TiO2 nanoparticle fabrication. XRD (X-ray diffraction), and Raman spectroscopic techniques were utilized to confirm the formation of the pure rutile phase of titania. SEM (scanning electron microscope) and TEM (Transmission electron microscope) images showed the cauliflower-like morphology of the as-prepared R-TiO2; reduced particle sizes of below 5 nm were observed and confirmed through high resolution images. The catalytic activity of the as-prepared R-TiO2 was tested under visible light irradiation for methylene blue dye degradation reactions. Dye degradation occurred very effectively, even at higher concentrations of methylene blue (MB), at reduced time intervals from 5 to 3 h of reaction time. The as-prepared rutile phase of pure titania nanoparticles was applied in a catalysis application for the purpose of inducing various types of organic dye degradation or catalytic transformation in the presence of visible light. Full article
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17 pages, 4817 KiB  
Article
Fabrication of Multifunctional SERS Platform Based on Ag NPs Self-Assembly Ag-AAO Nanoarray for Direct Determination of Pesticide Residues and Baicalein in Real Samples
by Guochao Shi, Kuihua Li, Jungai Gu, Wenzhi Yuan, Shiqi Xu, Wei Han, Jianjun Gu, Liyong Wang, Zhibin Zhang, Congzhe Chen, Jialin Ge and Mingli Wang
Coatings 2021, 11(9), 1054; https://doi.org/10.3390/coatings11091054 - 31 Aug 2021
Cited by 7 | Viewed by 2675
Abstract
Aiming at the shortcomings of high cost and time-consumption in traditional liquid chromatography, an effective surface enhanced Raman scattering (SERS)-based trace detection method has been proposed to quantitatively identify the active component of traditional Chinese medicine. In this paper, a high-performance and versatile [...] Read more.
Aiming at the shortcomings of high cost and time-consumption in traditional liquid chromatography, an effective surface enhanced Raman scattering (SERS)-based trace detection method has been proposed to quantitatively identify the active component of traditional Chinese medicine. In this paper, a high-performance and versatile SERS platform based on Ag nanoparticles (NPs) self-assembly Ag-anodized aluminium (Ag NPs-Ag-AAO) nanoarray was fabricated by controllable physico-chemical preparation technology. The results indicated that the electromagnetic field enhancement effect was sharply strengthened as Ag NPs assembled, and the experimental enhancement factor (EEF) value was calculated to be 1.0083 × 106. This novel Ag NPs-Ag-AAO nanoarray with substantial “hot spots” exhibited high SERS signal reproducibility, with the relative standard deviation (RSD) value at less than 2.23%. More importantly, this SERS platform was applied to detect active component Baicalein in Scutellaria baicalensis, and the limit of detection (LOD) was located at 10 fg/mL. Therefore, this Ag NPs-Ag-AAO nanoarray with high sensitivity, strong Raman signal reproducibility and reliable practicability has broad application prospects in the rapid detection of trace substances in the active components of traditional Chinese medicine and is expected to be popularized. Full article
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19 pages, 3199 KiB  
Article
Enhanced Removal of Non-Steroidal Inflammatory Drugs from Water by Quaternary Chitosan-Based Magnetic Nanosorbents
by Sofia F. Soares, Tito Trindade and Ana L. Daniel-da-Silva
Coatings 2021, 11(8), 964; https://doi.org/10.3390/coatings11080964 - 13 Aug 2021
Cited by 16 | Viewed by 2612
Abstract
Non-steroidal anti-inflammatory drugs (NSAIDs) are among the most common pharmaceuticals used worldwide. They are widely detected in natural waters due to their persistence in wastewater treatment, and their removal is desirable in wastewater management. As a contribution to tackle this challenge, this study [...] Read more.
Non-steroidal anti-inflammatory drugs (NSAIDs) are among the most common pharmaceuticals used worldwide. They are widely detected in natural waters due to their persistence in wastewater treatment, and their removal is desirable in wastewater management. As a contribution to tackle this challenge, this study explores magnetic quaternary chitosan-based nanosorbents for the effective magnetically assisted removal of three NSAIDs (diclofenac, naproxen, and ketoprofen) from water. Toward this goal, silane groups were grafted onto the backbone of trimethyl chitosan through the reaction with an epoxide functionalized silane. Once silanized, the modified chitosan was employed to coat Fe3O4 nanoparticles. The prepared materials were characterized using FTIR spectroscopy and solid-state 29Si and 13C NMR spectroscopy, which confirmed the encapsulation of Fe3O4 nanoparticles with a hybrid siliceous material enriched in trimethyl chitosan. The effect of the initial NSAIDs concentration, pH, and contact time in the adsorption behavior was investigated. The kinetic data were well described by the pseudo-second-order kinetic model, indicating a chemisorption mechanism. The maximum adsorption capacities estimated from the Langmuir model were 188.5 mg/g (0.5925 mmol/g), 438.1 mg/g (1.7371 mmol/g), and 221.5 mg/g (0.8710 mmol/g) for diclofenac, naproxen, and ketoprofen, respectively. These adsorption capacities are higher than those of most reported sorbents, indicating the potential of these biosorbents to remove the selected NSAIDs using low-energy magnetically assisted separation. Full article
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14 pages, 1611 KiB  
Article
Effect of Selenium Nanoparticles on Germination of Hordéum Vulgáre Barley Seeds
by Shahida Anusha Siddiqui, Andrey Vladimirovich Blinov, Alexander Vladimirovich Serov, Alexey Alekseevich Gvozdenko, Alexander Aleksandrovich Kravtsov, Andrey Ashotovich Nagdalian, Vladislav Viktorovich Raffa, David Guramievich Maglakelidze, Anastasiya Alexandrovna Blinova, Anna Vitalievna Kobina, Alexey Borisovich Golik and Salam A. Ibrahim
Coatings 2021, 11(7), 862; https://doi.org/10.3390/coatings11070862 - 19 Jul 2021
Cited by 47 | Viewed by 5629
Abstract
Within the framework of this study, the effect of nanoparticles of the essential trace element selenium stabilized by Polyvinylpirrolidone (PVP) C15 (8 ± 2 kDa) and ascorbic acid on the germination of barley seeds has been studied. Selenium nanoparticles stabilized by PVP C15 [...] Read more.
Within the framework of this study, the effect of nanoparticles of the essential trace element selenium stabilized by Polyvinylpirrolidone (PVP) C15 (8 ± 2 kDa) and ascorbic acid on the germination of barley seeds has been studied. Selenium nanoparticles stabilized by PVP C15 (8 ± 2 kDa) and ascorbic acid, characterized by a spherical shape, monodisperse size distribution, and a diameter of about 70 ± 5 nm, were obtained by the chemical reduction method. The experiment compared the effect of selenium nanoparticles and selenous acid on seed germination. The positive effect of preparation of selenium nanoparticles stabilized by PVP C15 (8 ± 2 kDa) and ascorbic acid on the length of roots and shoots, the number of roots, and the percentage of seed germination has been revealed. It was determined that the highest percentage of Hordeum vulgare L. culture seed germination was achieved using a preparation of selenium nanoparticles stabilized by PVP C15 (8 ± 2 kDa) and ascorbic acid at a concentration of of 4.65 µg/mL. Analysis of the results showed that selenium in the form of nanoparticles has an order of magnitude that is less toxic than in the form of selenous acid. The study of morphological and functional parameters during the germination of Hordeum vulgare L. seeds allowed us to conclude that selenium nanoparticles can be successfully used in agronomy and agriculture to provide plants with the essential microelement selenium, which is necessary for the normal growth and development of crops. Full article
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2019

Jump to: 2022, 2021, 2018

14 pages, 1197 KiB  
Review
Innovative Wood Surface Treatments Based on Nanotechnology
by Antonios N. Papadopoulos and Hamid R. Taghiyari
Coatings 2019, 9(12), 866; https://doi.org/10.3390/coatings9120866 - 16 Dec 2019
Cited by 65 | Viewed by 6995
Abstract
This work reviewed innovative wood surface treatments based on nanotechnology. It is well documented in the literature that the cell walls of wood present significant porosity; this porosity is on a molecular scale. The main reason for the use of nanotechnology in wood [...] Read more.
This work reviewed innovative wood surface treatments based on nanotechnology. It is well documented in the literature that the cell walls of wood present significant porosity; this porosity is on a molecular scale. The main reason for the use of nanotechnology in wood science and technology is the unique characteristic of nano-based materials to effectively penetrate deeply into wood substrates, which, in turns, results in the alteration of their surface chemistry. This subsequently causes an improvement in wood properties. Any potential change in the wood properties due to treatment with nanomaterials is based on the higher interfacial area which is developed due to the treatment. This occurs because the number of particles is significantly reduced to the nanoscale. The nanomaterials improve the properties of wood as a raw material and alter its original features to a limited extent. However, their potential impact on both health and the environment should be addressed by applying tools such as life-cycle assessments. This will avoid mistakes being made in which new technologies are released on the market prior to an impact assessment having been carried out. Full article
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8 pages, 1535 KiB  
Communication
Core/Shell Gel Beads with Embedded Halloysite Nanotubes for Controlled Drug Release
by Lorenzo Lisuzzo, Giuseppe Cavallaro, Filippo Parisi, Stefana Milioto, Rawil Fakhrullin and Giuseppe Lazzara
Coatings 2019, 9(2), 70; https://doi.org/10.3390/coatings9020070 - 24 Jan 2019
Cited by 52 | Viewed by 5513
Abstract
The use of nanocomposites based on biopolymers and nanoparticles for controlled drug release is an attractive notion. We used halloysite nanotubes that were promising candidates for the loading and release of active molecules due to their hollow cavity. Gel beads based on chitosan [...] Read more.
The use of nanocomposites based on biopolymers and nanoparticles for controlled drug release is an attractive notion. We used halloysite nanotubes that were promising candidates for the loading and release of active molecules due to their hollow cavity. Gel beads based on chitosan with uniformly dispersed halloysite nanotubes were obtained by a dropping method. Alginate was used to generate a coating layer over the hybrid gel beads. This proposed procedure succeeded in controlling the morphology at the mesoscale and it had a relevant effect on the release profile of the model drug from the nanotube cavity. Full article
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2018

Jump to: 2022, 2021, 2019

10 pages, 2680 KiB  
Communication
Ordered Array of Metal Particles on Semishell Separated with Ultrathin Oxide: Fabrication and SERS Properties
by Xianglin Li, Zhiwei Wang, Chiew Kei Tan, Zexiang Shen and Alfred Iing Yoong Tok
Coatings 2019, 9(1), 20; https://doi.org/10.3390/coatings9010020 - 29 Dec 2018
Cited by 1 | Viewed by 4049
Abstract
Metal particles in gap cavities provide an interesting system to achieve hybrid local surface plasmon modes for local field enhancement. Here, we demonstrate a relatively simple method to fabricate Ag nanoparticles positioned on Ag semishells separated by a thin (~5 nm) dielectric layer. [...] Read more.
Metal particles in gap cavities provide an interesting system to achieve hybrid local surface plasmon modes for local field enhancement. Here, we demonstrate a relatively simple method to fabricate Ag nanoparticles positioned on Ag semishells separated by a thin (~5 nm) dielectric layer. The obtained structure can provide strong local electric field enhancement for surface-enhanced Raman scattering (SERS). The fabrication of the ordered array structure was realized by nanosphere self-assembly, atomic layer deposition, and metal thin-film dewetting. Numerical simulation proved that, compared to the conventional metal semishell arrays, the additional Ag particles introduce extra hot spots particularly in the valley regions between adjacent Ag semishells. As a result, the SERS enhancement factor of the metal semishell-based plasmonic structure could be further improved by an order of magnitude. The developed novel plasmonic structure also shows good potential for application in plasmon-enhanced solar water-splitting devices. Full article
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13 pages, 8246 KiB  
Article
Corrosion Resistance of Waterborne Epoxy Coatings by Incorporation of Dopamine Treated Mesoporous-TiO2 Particles
by Na Wang, Xinlin Diao, Jing Zhang and Ping Kang
Coatings 2018, 8(6), 209; https://doi.org/10.3390/coatings8060209 - 31 May 2018
Cited by 40 | Viewed by 5573
Abstract
In this paper, waterborne epoxy (EP) coatings were modified by the incorporation of synthetic structure (DA/meso-TiO2) to improve the anticorrosion ability of waterborne epoxy coatings for steel structures. Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption–desorption, X-ray diffraction (XRD) and thermo-gravimetric analyses [...] Read more.
In this paper, waterborne epoxy (EP) coatings were modified by the incorporation of synthetic structure (DA/meso-TiO2) to improve the anticorrosion ability of waterborne epoxy coatings for steel structures. Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption–desorption, X-ray diffraction (XRD) and thermo-gravimetric analyses (TGA) were used to characterize textural properties of DA/meso-TiO2. Corrosion performances of mild carbon steel coated samples were tested by salt spray tests and employing electrochemical impedance spectroscopy (EIS). FTIR, XRD, TGA and nitrogen adsorption–desorption attested to dopamine polymerization within the mesopores and on the surface of meso-TiO2. The results of EIS and salt spray test showed that the specimen coated with 1.0 wt % DA/meso-TiO2 exhibited optimum corrosion performance among other coating specimens. Full article
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14 pages, 5920 KiB  
Article
Effect of Graphene Oxide/ZSM-5 Hybrid on Corrosion Resistance of Waterborne Epoxy Coating
by Na Wang, Huiying Gao, Jing Zhang and Ping Kang
Coatings 2018, 8(5), 179; https://doi.org/10.3390/coatings8050179 - 07 May 2018
Cited by 30 | Viewed by 5902
Abstract
In this study, the preparation of modified graphene oxide (GO) synergistic structure (ZSM-5-NH-GO) and the effect of this structure on the corrosion performance of epoxy coatings were investigated. The structural and morphological properties of ZSM-5-NH-GO were characterized by Fourier transform infrared spectroscopy (FT-IR), [...] Read more.
In this study, the preparation of modified graphene oxide (GO) synergistic structure (ZSM-5-NH-GO) and the effect of this structure on the corrosion performance of epoxy coatings were investigated. The structural and morphological properties of ZSM-5-NH-GO were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The corrosion performances were studied by electrochemical impedance spectroscopy (EIS) and salt spray tests. The EIS results showed that the corrosion resistance of steel substrate was considerably improved by ZSM-5-NH-GO. The salt spray tests demonstrated that the ZSM-5-NH-GO coating provided strong corrosion performance for steel substrate. The mechanical properties of the epoxy-composite coatings containing ZSM-5-NH-GO were studied by adhesion tests. The above results indicated that the composite coating containing 0.7 wt % ZSM-5-NH-GO composite possessed most excellent anti-corrosion performance compared with other epoxy coatings. Full article
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