Article
Engineering, Mechanical
A. Gaydaychuk, S. Linnik, A. Mitulinsky, S. Zenkin
Summary: Thick diamond films were synthesized on Si substrate with different methane concentration using HFCVD method. Regardless of the microstructure, diamond coatings exhibit the same erosion mechanisms. The microcrystalline diamond coating shows the maximum erosion resistance.
Article
Chemistry, Physical
A. Gaydaychuk, S. Linnik, A. Mitulinsky, S. Zenkin, V. Bulakh
Summary: The paper presents diamond films with dendrite-like or nanofeathers structure, synthesized in different gas mixtures. These diamond dendrites consist of diamond crystallites of various sizes and non-diamond carbon, with a height comparable to the film thickness and a lateral size not exceeding 200 nm. The nitrogen content in the gas mixture affects the size, residual stresses, roughness, hardness, and Young's modulus of the resulting diamond films.
SURFACES AND INTERFACES
(2023)
Article
Engineering, Mechanical
Jihua Peng, Chao Xiong, Jiacheng Liao, Jingwen Liao, Liangchuan Yuan, Liejun Li
Summary: By using a combined pretreatment of sand-blasting and two-step etching, nanocrystalline diamond coatings with primarily diamond crystallites and good adhesion were deposited onto carbide cement by tuning the Ar/H-2 ratio in the hot filament chemical vapor deposition (HFCVD) work gas. Adding Ar to the work gas can enhance grain refinement and tune the morphology of the nanocrystalline coatings, leading to a decrease in roughness, friction coefficient, and wear rate, with a change in the wear mechanism.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Analytical
Christopher Bahro, Subir Goswami, Sarah Gernhart, Dipankar Koley
Summary: Solid-contact ion-selective electrodes have the advantages of miniaturization, high selectivity and sensitivity. However, the need for calibration curves limits their applicability as disposable sensors or for remote water sample analysis. To overcome this, a unique back contact was designed to fix the background potential and determine the contents of potassium and calcium in creek water samples.
ANALYTICAL CHEMISTRY
(2022)
Article
Materials Science, Coatings & Films
Qiang Lin, Sulin Chen, Zhe Ji, Zhewei Huang, Zhinan Zhang, Bin Shen
Summary: This study demonstrates the deposition of UNCD films can be achieved in CH4/H-2 chemistry without Ar, and the re-nucleation rate can be specifically regulated by adjusting gas pressure and carbon concentration. A novel kinetic growth model was established to interpret the UNCD growth mechanism with CH4/H-2 chemistry, and the atmospheric window for the deposition of UNCD films was obtained. The study provides insights into the UNCD growth mechanism without Ar content and simplifies the gas strategy for UNCD growth.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yuhou Wu, Huisen Zhang, Guangyu Yan, Lusheng Liu, Daniel Cristea, He Wang, Yumiao Yang, Jianhui Shen
Summary: The study analyzed the influence of key parameters in hot filament chemical vapor deposition on temperature distribution during diamond coating deposition on silicon nitride substrates using finite element method. The accuracy of the model was verified through experimental measurements, leading to the design of an optimal hot filament arrangement and deposition parameters for higher quality diamond films.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Physical
Jihua Peng, Jiwei Zeng, Yang Xiao, Weiqiu Li
Summary: By converting the surface layer of WC-Co cemented carbide into intermetallic and Co-rich compound phases through a novel conversion annealing pretreatment, the adhesion of diamond coating can be improved and a high-quality microscale diamond coating can be deposited onto the conversion layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Jin Uk Gwon, Tae Hwan Jang, Min Su Kim, Tae Gyu Kim, Mun Ki Bae
Summary: A boron-doped diamond thin film was synthesized using the HFCVD method, and its surface shape, growth rate, bonding structure, and electrochemical properties were characterized using SEM, Raman spectroscopy, and cyclic voltammetry. The growth rate and crystal size of the film decreased with increasing boron doping concentration, and Raman analysis confirmed the bonding effects of boron on the diamond structure. Cyclic voltammetry analysis showed that the boron-doped diamond thin film had a wide potential window.
MODERN PHYSICS LETTERS B
(2022)
Article
Nanoscience & Nanotechnology
Dhananjay K. Sharma, Ana Girao, Patrick Chapon, Miguel A. Neto, Filipe J. Oliveira, Rui F. Silva
Summary: In this study, pulsed RF glow discharge optical emission spectrometry (GD-OES) combined with ultrafast sputtering (UFS) was used to accurately measure the elemental depth profiles and bulk distribution of boron in diamond thin films. The results showed a nonhomogeneous distribution of boron within the diamond crystalline structure, and the effective doping was not linearly correlated to the increasing boron content.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Coatings & Films
Hua Wang, Chengchuan Wang, Xinchang Wang, Fanghong Sun
Summary: This study investigates the effects of carbon concentration and gas pressure on various polycrystalline diamond films synthesized with HFCVD method. By adjusting carbon concentration and gas pressure, diamond films with different crystal structures and surface properties can be obtained. Achieving a dynamic equilibrium between renucleation rate and removal rate under hydrogen-rich gas chemistry is crucial for high-quality UNCD film synthesis.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Ming Lu, Dongdong Liu, Chuan Zhang, Fanghong Sun
Summary: The oxidation resistance of diamond films is crucial for their performance in high-temperature applications. This study uses density functional theory (DFT) to investigate the influence of multiple doping on the oxidation resistance of diamond films and find the optimal doping configuration. Experimental results and theoretical calculations both demonstrate that multiple doping can effectively reduce the high-temperature oxidation rate of diamond films.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Zhenhai Guo, Fuming Deng, Lei Zhang, Cen Hao, Xin Zhao, Daohui Xiang
Summary: The experimental results show that under dry friction conditions, the texture structure has a significant impact on the friction coefficient and wear resistance of diamond coatings. For the same type of textures, the larger the texture surface area, the lower the friction coefficient. Elliptical textures can capture abrasive particles and reduce the friction coefficient of diamond coatings.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Ming Lu, Chuan Zhang, Dongdong Liu, Xinchang Wang, Fanghong Sun
Summary: Fabricating diamond films using liquid carbon source precursors in hot filament chemical vapor deposition (HFCVD) is an emerging technology. The density functional theory (DFT) method was used to analyze the decomposition and adsorption processes of acetone and methane on the surface of a diamond (1 1 1) models and to clarify the advantages of liquid carbon source precursors. The doping mechanisms of B, N, and Si elements were also analyzed by studying the decomposition and adsorption reaction processes of trimethyl borate, urea, and ethyl orthosilicate on the surface of diamond (1 1 1) model.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Xinchang Wang, Xin Song, Yu Qiao, Karin Larsson, Fanghong Sun
Summary: This paper investigates the synthesis of nitrogen-doped diamonds using different doping sources, and analyzes the effects of urea and N2 on the growth and properties of diamond films. The results show that urea has a higher doping efficiency and has less impact on diamond purity and mechanical properties compared to N2. By selecting the doping source and optimizing the doping ratio, the growth and properties of diamond films can be controlled to meet specific application requirements.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ayashkanta Jena, Sisira Kanta Pattnaik, Binod Bihari Palei, Saroj Kumar Sarangi
Summary: The HFCVD process is used to synthesize diamond crystals on the WC-Co SPUN inserts. Different seeding materials result in different crystal formation and properties, with the best performance observed for tantalum and diamond powders.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Yan Li, Xiaopeng Lu, Maria Serdechnova, Carsten Blawert, Mikhail L. Zheludkevich, Kun Qian, Tao Zhang, Fuhui Wang
Summary: This study achieved in-situ incorporation of layered double hydroxides (LDH) nanocontainers into plasma electrolytic oxidation (PEO) coatings on AZ91 Mg alloy. Fumarate was selected as the Mg corrosion inhibitor for exchange and intercalation into the nanocontainers, which were then incorporated into the coating. It was found that the presence of LDH nanocontainers increased the thickness and compactness of the coatings. The corrosion resistance of the coatings was greatly enhanced and stabilized by the loaded inhibitor and nanocontainers through ion-exchange when corrosion occurred.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Metallurgy & Metallurgical Engineering
Gen Zhang, Liang Wu, Maria Serdechnova, Aitao Tang, Cheng Wang, Carsten Blawert, Fusheng Pan, Mikhail L. Zheludkevich
Summary: In this study, plasma electrolytic oxidation (PEO) coatings on magnesium alloy were produced and followed by hydrothermal treatments to synthesize layered double hydroxides (LDHs) based nanocontainers. The synthesis of LDHs was performed in different growth solutions. The results showed that it was difficult to form LDHs on silicate-based PEO coating, while hydrothermal treatments in Al3+ containing solution played an important role in corrosion resistance for phosphate and silicate-based PEO coatings.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Tania Peixoto, Daniel Silva, Miguel Rodrigues, Miguel Neto, Rui Silva, Maria C. Paiva, Liliana Grenho, Maria Helena Fernandes, Maria A. Lopes
Summary: This study investigates the surface functionalization of polymeric braids to improve their application in tendon repair. By incorporating amine groups, the researchers successfully enhance the interaction between cells and the material, potentially improving the biointegration of the braids. The NH3 plasma approach is considered more environmentally friendly, faster, and easier to scale-up.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Review
Engineering, Environmental
Zhihao Chen, Nico Scharnagl, Mikhail L. Zheludkevich, Hanjie Ying, Wenzhong Yang
Summary: Metal corrosion causes significant damage to the economy, environment, and industry. Smart self-healing coatings have attracted attention for active corrosion protection. These coatings achieve self-healing through either intrinsic or extrinsic methods. Intrinsic self-healing coatings utilize reversible physical and chemical interactions between molecules, providing permanent self-healing effects. Extrinsic methods involve embedding micro/nanocontainers in the coatings, which can sense changes in the micro-environment and repair the coating's surface. This review summarizes the research progress of micro/nanocontainer-based stimuli-responsive self-healing coatings, exploring their different functions and applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
P. Pereiraa, A. M. Ferro Rocha, J. Sacramento, F. J. Oliveira, L. F. Malheiros, A. M. R. Senos, A. C. Bastos
Summary: This study investigates the corrosion behavior of cemented carbides with different Ni-based binders in highly corrosive environments. The results show that the hardmetals with Ni-based binders exhibit superior corrosion resistance compared to WC-Co.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Review
Environmental Sciences
Priscilla Brosler, Ana V. Girao, Rui F. Silva, Joao Tedim, Filipe J. Oliveira
Summary: Re-evaluation of conventional wastewater treatment processes is important for improving the quality of aquatic environment. Electrochemical Advanced Oxidation Processes (EAOPs) using Boron-doped diamond (BDD) technology show promising results in degrading and mineralizing water pollutants. This study uses systematic literature review and bibliometric analysis to assess the synergism between AO using BDD technology and other oxidation methods. The findings suggest that combining AO with add-ons or Fenton-based methods enhances degradation and mineralization efficiencies, and further research is needed for effective application in wastewater treatment facilities.
Article
Engineering, Biomedical
Luis Nascimento, Cristiana Fernandes, Ricardo. M. Silva, Angela Semitela, Barbara M. de Sousa, Paula A. A. P. Marques, Sandra I. Vieira, Rui. F. Silva, Nathalie Barroca, Gil Goncalves
Summary: A novel therapeutic approach based on carbon nanotubes (CNTs) is explored in this study to enhance the regeneration of neural cells. Different morphologies of CNTs are created and tested for their ability to stimulate the formation of neurons and networks. The findings provide a new avenue for the construction of electroresponsive scaffolds for neural tissue engineering.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Environmental Sciences
Alyne Lamy-Mendes, David Lopes, Ana V. Girao, Rui F. Silva, Wim J. Malfait, Luisa Duraes
Summary: This research explores the effect of amino functionalization and the addition of carbon nanostructures to MTMS-based silica aerogels on their removal capacities for various contaminants. The aerogels successfully removed various organic compounds and drugs, achieving high adsorption capacities for toluene and xylene. The addition of a co-precursor containing amine groups and/or carbon nanomaterials enhanced the adsorption capacities of the aerogels and demonstrated their potential as alternative industrial sorbents.
Article
Materials Science, Ceramics
Priscilla Brosler, Rui F. Silva, Joao Tedim, Filipe J. Oliveira
Summary: This study aimed to develop dense ceramics of silicon nitride-titanium nitride with low electrical resistivity and excellent mechanical properties, to be used as substrates for conductive diamond electrodes. By adding TiN powder to a Si3N4 matrix, the composite ceramics showed improved electrical conductivity and superior mechanical properties compared to Si3N4 matrix alone.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
R. M. Silva, J. Rocha, R. F. Silva
Summary: In this study, we successfully coated vertically aligned carbon nanotube micropillars with a uniform and high surface area Fe-NH2TP hybrid coating using Atomic/Molecular Layer Deposition (ALD/MLD). The effectiveness of the coating was confirmed through various analytical techniques. The hydrophobic property of the Fe-NH2TP hybrid film was also demonstrated. These findings contribute to advancing the understanding of growing high-quality one-dimensional materials using ALD/MLD and have potential for future research in this field.
Article
Materials Science, Multidisciplinary
Stanley Udochukwu Ofoegbu, Mario Guerreiro Silva Ferreira, Helena I. S. Nogueira, Mikhail Zheludkevich
Summary: In this study, the electrochemical responses and activities towards oxygen reduction reactions (ORR) of carbon-fiber-reinforced polymers (CFRP), glassy carbon, and Highly Ordered Pyrolytic Graphite (HOPG) were evaluated and ranked. The ranking of their activities in supporting cathodic reactions that can lead to galvanic corrosion on coupling with metallic materials is as follows: CFRP > glassy carbon > HOPG. The differences in the electrochemical responses of these carbon surfaces to ORR are postulated to be due to differences in the proportions of edge sites present on each carbon surface.
C-JOURNAL OF CARBON RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Edita Garskaite, Giedrius Balciunas, Marian Drienovsky, Denis Sokol, Dick Sandberg, Alexandre C. Bastos, Andrei N. Salak
Summary: DCPD crystals were synthesised within Scots pine sapwood using a wet-chemistry route. The wood cell lumina and cell wall were assessed, and the morphology and elemental composition of the co-precipitated mineral were analyzed. Brushite mineral crystallization and growth in the wood matrix were studied, and the chemical composition of the mineral was evaluated. The viability of the wet-chemistry processing route for wood reinforcement with CaP-based minerals was demonstrated, suggesting potential in producing environmentally friendly building materials.
Article
Dentistry, Oral Surgery & Medicine
Alexandra Vinagre, Catarina Barros, Joana Goncalves, Ana Messias, Filipe Oliveira, Joao Ramos
Summary: This study evaluated the effect of two finishing and polishing methods on the surface roughness of different resin composites. The results showed that both the polishing methods and the type of resin composite had a significant impact on the surface roughness, with differences observed between the two polishing methods. Some resin composites exhibited better polishability, while others showed inconsistent results.
INTERNATIONAL JOURNAL OF DENTISTRY
(2023)
Article
Chemistry, Multidisciplinary
Nikola Bozovic, Kristina Mojsilovic, Srna Stojanovic, Ljiljana Damjanovic-Vasilic, Maria Serdechnova, Carsten Blawert, Mikhail Zheludkevich, Stevan Stojadinovic, Rastko Vasilic
Summary: The preparation and properties of oxide coatings with immobilized ZSM-5 zeolite obtained by plasma electrolytic oxidation on aluminum support were investigated. The obtained composite coatings were characterized with respect to their morphology, phase and chemical composition, as well as photocatalytic activity and anti-corrosion properties. The coatings with Ce-exchanged ZSM-5 showed higher photocatalytic activity and more effective corrosion protection than those with pure ZSM-5.
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
(2022)
