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Physicochemical Research on Material Surfaces
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Physicochemical Research on Material Surfaces

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Physical Chemistry".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 5180

Special Issue Editor

Dr. Guiyong Xiao

E-Mail Website
Guest Editor
Schools of Materials Science & Engineering, Shandong University, Jinan, China
Interests: biofunctional coatings on biomaterial surfaces

Special Issue Information

Dear Colleagues,

The physicochemical properties of biomaterial surfaces, including topography, roughness, hydrophilicity, electrical conductivity, and elemental composition, have a significant impact on the bioactivity of surrounding cells. These properties can be modified through various chemical methods such as anodization, microarc oxidation, plasma spraying, ion implantation, biomimetic deposition, and chemical conversion. To address an increasingly diverse range of challenges, continuous research efforts are being undertaken globally in both academia and industry to discover innovative material surface modifier.

This Special Issue "Physicochemical Research on Material Surfaces" aims to provide a platform for researchers to present current and recent advancements in technological and theoretical descriptions of physicochemical material surface modification. We invite the submission of original research papers, review articles, and short communication letters.

The potential topics encompass a wide range of subjects focusing on material chemistry, including, but not limited to, the following areas:

  • Design, synthesis, and processing of coatings on material surfaces;
  • Micro/Nano structural optimization of material surfaces;
  • Chemical functionalization of materials;
  • Corrosion resistance of materials;
  • Chemical methods for surface strengthening of materials.

Dr. Guiyong Xiao
Guest Editor

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. Molecules is an international peer-reviewed open access semimonthly 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 2700 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

  • coating
  • surface modification
  • micro/nano structure
  • chemical functionalization
  • biomaterials
  • bioactivity

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (5 papers)

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Research

22 pages, 7801 KiB  
Article
Crystallization and Optical Behaviour of Nanocomposite Sol-Gel TiO2:Ag Films
by Tatyana Ivanova, Antoaneta Harizanova, Tatyana Koutzarova and Raphael Closset
Molecules 2024, 29(21), 5156; https://doi.org/10.3390/molecules29215156 - 31 Oct 2024
Viewed by 454
Abstract
Sol-gel spin coating method was employed for depositing TiO2 and Ag-doped TiO2 films. The effects of Ag doping and the annealing temperatures (300–600 °C) were studied with respect to their structural, morphological, vibrational, and optical properties. Field Emission Scanning Electron microscopy [...] Read more.
Sol-gel spin coating method was employed for depositing TiO2 and Ag-doped TiO2 films. The effects of Ag doping and the annealing temperatures (300–600 °C) were studied with respect to their structural, morphological, vibrational, and optical properties. Field Emission Scanning Electron microscopy (FESEM) investigation exhibited the grained, compact structures of TiO2-based films. Ag incorporation resulted in a rougher film surface. X-ray diffraction (XRD) results confirmed the formation of Ag nanoparticles and AgO phase, along with anatase and rutile TiO2, strongly depending on Ag concentration and technological conditions. AgO fraction diminished after high temperature annealing above 500 °C. The vibrational properties were characterized by Fourier Transform Infrared (FTIR) spectroscopy. It was found that silver presence induced changes in IR bands of TiO2 films. UV–VIS spectroscopy revealed that the embedment of Ag NPs in titania matrix resulted in higher absorbance across the visible spectral range due to local surface plasmon resonance (LSPR). Ag doping reduced the optical band gap of sol-gel TiO2 films. The optical and plasmonic modifications of TiO2:Ag thin films by the number of layers and different technological conditions (thermal and UV treatment) are discussed. Full article
(This article belongs to the Special Issue Physicochemical Research on Material Surfaces)
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12 pages, 6727 KiB  
Article
Insights into the Understanding of the Nickel-Based Pre-Catalyst Effect on Urea Oxidation Reaction Activity
by Haipeng Liu, Peike Wang, Xue Qi, Ao Yin, Yuxin Wang, Yang Ye, Jingjing Luo, Zhongqi Ren, Lina Chen, Suzhu Yu and Jun Wei
Molecules 2024, 29(14), 3321; https://doi.org/10.3390/molecules29143321 - 15 Jul 2024
Viewed by 717
Abstract
Nickel-based catalysts are regarded as the most excellent urea oxidation reaction (UOR) catalysts in alkaline media. Whatever kind of nickel-based catalysts is utilized to catalyze UOR, it is widely believed that the in situ-formed Ni3+ moieties are the true active sites and [...] Read more.
Nickel-based catalysts are regarded as the most excellent urea oxidation reaction (UOR) catalysts in alkaline media. Whatever kind of nickel-based catalysts is utilized to catalyze UOR, it is widely believed that the in situ-formed Ni3+ moieties are the true active sites and the as-utilized nickel-based catalysts just serve as pre-catalysts. Digging the pre-catalyst effect on the activity of Ni3+ moieties helps to better design nickel-based catalysts. Herein, five different anions of OH−, CO32−, SiO32−, MoO42−, and WO42− were used to bond with Ni2+ to fabricate the pre-catalysts β-Ni(OH)2, Ni-CO3, Ni-SiO3, Ni-MoO4, and Ni-WO4. It is found that the true active sites of the five as-fabricated catalysts are the same in situ-formed Ni3+ moieties and the five as-fabricated catalysts demonstrate different UOR activity. Although the as-synthesized five catalysts just serve as the pre-catalysts, they determine the quantity of active sites and activity per active site, thus determining the catalytic activity of the catalysts. Among the five catalysts, the amorphous nickel tungstate exhibits the most superior activity per active site and can catalyze UOR to reach 158.10 mA·cm–2 at 1.6 V, exceeding the majority of catalysts. This work makes for a deeper understanding of the pre-catalyst effect on UOR activity and helps to better design nickel-based UOR catalysts. Full article
(This article belongs to the Special Issue Physicochemical Research on Material Surfaces)
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13 pages, 3372 KiB  
Article
Construction of Uniform LiF Coating Layers for Stable High-Voltage LiCoO2 Cathodes in Lithium-Ion Batteries
by Ziyang Xiao, Xiangbing Zhu, Shuguang Wang, Yanhong Shi, Huimin Zhang, Baobin Xu, Changfeng Zhao and Yan Zhao
Molecules 2024, 29(6), 1414; https://doi.org/10.3390/molecules29061414 - 21 Mar 2024
Viewed by 1624
Abstract
Stabilizing LiCoO2 (LCO) at 4.5 V rather than the common 4.2 V is important for the high specific capacity. In this study, we developed a simple and efficient way to improve the stability of LiCoO2 at high voltages. After a simple [...] Read more.
Stabilizing LiCoO2 (LCO) at 4.5 V rather than the common 4.2 V is important for the high specific capacity. In this study, we developed a simple and efficient way to improve the stability of LiCoO2 at high voltages. After a simple sol–gel method, we introduced trifluoroacetic acid (TA) to the surface of LCO via an afterwards calcination. Meanwhile, the TA reacted with residual lithium on the surface of LCO, further leading to the formation of uniform LiF nanoshells. The LiF nanoshells could effectively restrict the interfacial side reaction, hinder the transition metal dissolution and thus achieve a stable cathode–electrolyte interface at high working-voltages. As a result, the LCO@LiF demonstrated a much superior cycling stability with a capacity retention ratio of 83.54% after 100 cycles compared with the bare ones (43.3% for capacity retention), as well as high rate performances. Notably, LiF coating layers endow LCO with excellent high-temperature performances and outstanding full-cell performances. This work provides a simple and effective way to prepare stable LCO materials working at a high voltage. Full article
(This article belongs to the Special Issue Physicochemical Research on Material Surfaces)
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13 pages, 3517 KiB  
Article
Study on Bulk-Surface Transport Separation and Dielectric Polarization of Topological Insulator Bi1.2Sb0.8Te0.4Se2.6
by Yueqian Zheng, Tao Xu, Xuan Wang, Zhi Sun and Bai Han
Molecules 2024, 29(4), 859; https://doi.org/10.3390/molecules29040859 - 15 Feb 2024
Cited by 1 | Viewed by 983
Abstract
This study successfully fabricated the quaternary topological insulator thin films of Bi1.2Sb0.8Te0.4Se2.6 (BSTS) with a thickness of 25 nm, improving the intrinsic defects in binary topological materials through doping methods and achieving the separation of transport [...] Read more.
This study successfully fabricated the quaternary topological insulator thin films of Bi1.2Sb0.8Te0.4Se2.6 (BSTS) with a thickness of 25 nm, improving the intrinsic defects in binary topological materials through doping methods and achieving the separation of transport characteristics between the bulk and surface of topological insulator materials by utilizing a comprehensive Physical Properties Measurement System (PPMS) and Terahertz Time-Domain Spectroscopy (THz-TDS) to extract electronic transport information for both bulk and surface states. Additionally, the dielectric polarization behavior of BSTS in the low-frequency (10–107 Hz) and high-frequency (0.5–2.0 THz) ranges was investigated. These research findings provide crucial experimental groundwork and theoretical guidance for the development of novel low-energy electronic devices, spintronic devices, and quantum computing technology based on topological insulators. Full article
(This article belongs to the Special Issue Physicochemical Research on Material Surfaces)
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13 pages, 2077 KiB  
Article
Assessment of Selected Surface and Electrochemical Properties of Boron and Strontium-Substituted Hydroxyapatites
by Joanna Kolmas, Pavlo Samoilov, Aneta Jaguszewska and Ewa Skwarek
Molecules 2024, 29(3), 672; https://doi.org/10.3390/molecules29030672 - 31 Jan 2024
Viewed by 933
Abstract
Tissue engineering is an interdisciplinary field of science that has been developing very intensively over the last dozen or so years. New ways of treating damaged tissues and organs are constantly being sought. A variety of porous structures are currently being investigated to [...] Read more.
Tissue engineering is an interdisciplinary field of science that has been developing very intensively over the last dozen or so years. New ways of treating damaged tissues and organs are constantly being sought. A variety of porous structures are currently being investigated to support cell adhesion, differentiation, and proliferation. The selection of an appropriate biomaterial on which a patient’s new tissue will develop is one of the key issues when designing a modern tissue scaffold and the associated treatment process. Among the numerous groups of biomaterials used to produce three-dimensional structures, hydroxyapatite (HA) deserves special attention. The aim of this paper was to discuss changes in the double electrical layer in hydroxyapatite with an incorporated boron and strontium/electrolyte solution interface. The adsorbents were prepared via dry and wet precipitation and low-temperature nitrogen adsorption and desorption methods. The specific surface area was characterized, and the surface charge density and zeta potential were discussed. Full article
(This article belongs to the Special Issue Physicochemical Research on Material Surfaces)
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