Recent advances on electrochemistry of diamond related materials

Heavily boron-doped diamond grown on scalable heteroepitaxial quasi-substrates: A promising single crystal material for electrochemical sensing applications

Laying head is a high-precision engineering device in hot-rolled high speed wire rod production line. Previously research works are focused on the laying pipe wear-resisting. Laying pipe curve design method based on wire rod kinematics and dynamics analyses are not reported before. In order to design and manufacture the laying pipe, the motion and force process of the wire rod in the laying pipe should be studied. In this paper, a novel approach is proposed to investigate the force modeling for hot-rolled wire rod in laying pipe. An idea of limited element method is used to analysis and calculates the forces between laying pipe inner surface and wire rod. The design requirements of laying pipe curve for manufacturing are discussed. The kinematics and dynamics modeling for numerical calculation are built. A laying pipe curve equation is proposed by discussing design boundary conditions. Numerical results with different laying pipe curves design parameters are plotted and compared. The proposed approach performs good result which can be applied for laying pipe curve design and analysis for engineering application.

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Force Analysis and Curve Design for Laying Pipe in Loop Laying Head of Wire Rod Mills

Perfluorooctanoic acid (PFOA) has been identified as the most toxic specie of the family of perfluorinated carboxylic acids (PFCAs). It has been widely distributed and frequently detected in environmental wastewater. The compound's unique features such as inherent stability, rigidity, and resistance to harsh chemical and thermal conditions, due to its multiple and strong C–F bonds have resulted in its resistance to conventional wastewater remediations. Photolysis and bioremediation methods have been proven to be inefficient in their elimination, hence this article presents intensive literature studies and summarized findings reported on the application of advanced oxidation processes (AOPs) and photocatalytic degradation techniques as the best alternatives for the PFOA elimination from wastewater. Techniques of persulfate, photo-Fenton, electrochemical, photoelectrochemical and photocatalytic degradation have been explored and their mechanisms for the degradation and defluorination of the PFOA have been demonstrated. The major advantage of AOPs techniques has been centralized on the generation of active radicals such as sulfate (SO4•-) hydroxyl (•OH). While for the photocatalytic process, photogenerated species (electron (e) and holes (h + vb)) initiated the process. These active radicals and photogenerated species possessed potentiality to attack the PFOA molecule and caused the cleavage of the C–C and C–F bonds, resulting in its efficient degradation. Shorter-chain PFCAs have been identified as the major intermediates detected and the final stage entails its complete mineralization to carbon dioxide (CO2) and fluoride ion (F−). The prospects and challenges associated with the outlined techniques have been highlighted for better understanding of the subject matter for the PFOA elimination from real wastewaters. 

A review on superior advanced oxidations and photocatalytic degradation techniques for perfluorooctanoic acid (PFOA) elimination from wastewater.

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Advanced Nanomaterials-Based Electrochemical Biosensors for Catecholamines Detection: Challenges and Trends

Diamond for antifouling applications: A review

A continuous diamond film layer was initially deposited on the surface of the foam skeleton by chemical vapor deposition (CVD), followed by the vertical growth of carbon nanotubes (CNTs) on diamond film using nickel particles as a catalyst. The CNTs extended into the interior of the pores inside the foam skeleton as a secondary heat transfer pathway. The effect of different pore densities on the thermal conductivity and latent heat of phase change composites (PCMs) was explored. The obtained diamond foam/carbon nanotube/paraffin composites (DF-CNT/PWs) was demonstrated to achieve an ultra-high conductivity of 5.3 W/m·K, which is 19.6 times that of the paraffin matrix. The latent heat of the DF-CNT/PWs is 83.37 J·g−1. In addition, finite element simulation confirmed that the thermal conductivity enhancer system could significantly improve the uniformity of heat transfer inside the foam skeleton. 

Application of Multi-scale Pore Regulation for High Thermal Conductivity Foam Reinforcements in Energy Storage

Porous boron-doped diamond for efficient electrocatalytic elimination of azo dye Orange G

Periodic Porous 3D Boron-Doped Diamond Electrode for Enhanced Perfluorooctanoic Acid Degradation

Abstract Ferri/ferro-cyanide ([Fe(CN)6]3−/4−) redox couple has been extensively used as a benchmark to assess electrocatalytic degradation capability of boron-doped diamond (BDD) electrodes. However, the [Fe(CN)6]3−/4− is far more sensitive to the surface terminal groups of BDD surface than the other factors (e.g. surface morphology and electrode configuration) that are closely related to electrocatalytic degradation properties. Thus, inconsistency exists while correlating the degradation properties of BDD with electrochemical properties determined from ferri/ferro-cyanide redox couple. Herein, an exemplar pollutant, reactive blue 19 (RB-19), was electrochemically degraded using various terminated BDD electrodes, including hydrogen-terminated (H-BDD), oxygen-terminated (O-BDD) and porous oxygen-terminated BDDs (OE-BDD), obtained via cathodic and anodic polarization as well as oxygen plasma etching, respectively. Surprisingly, OE-BDD with the lower heterogeneous electron transfer rate constant for [Fe(CN)6]3−/4− showed a better electrocatalytic degradation capability toward RB-19, indicating the inconsistency for qualitatively evaluating degradation properties according to the kinetic parameters extracted from [Fe(CN)6]3−/4− redox system.

https://www.tandfonline.com/doi/pdf/10.1080/26941112.2022.2078168?needAccess=true

Li Yong Ma

Papers

Diamond for antifouling applications: A review

Application of Multi-scale Pore Regulation for High Thermal Conductivity Foam Reinforcements in Energy Storage

Porous boron-doped diamond for efficient electrocatalytic elimination of azo dye Orange G

Periodic Porous 3D Boron-Doped Diamond Electrode for Enhanced Perfluorooctanoic Acid Degradation

Inconsistency of BDD reactivity assessed by ferri/ferro-cyanide redox system and electrocatalytic degradation capability