Wettability modulation of nano-crystalline diamond films via in-situ CVD process

Zhang, Xiaofeng; Cui, Yu-xiao; Liu, Xi-bei; Sui, Tianyi; Ji, Chunhui; Zhang, Dawei

doi:10.1016/j.surfcoat.2019.07.069

Cited by 9 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hydrogen atoms bond with amorphous carbon phase as well terminate the growing surface and prevent transformation of diamond structure into graphite-like structures [ 53 ]. Therefore, it is reasonable to assume that CHx component should be present in C1s peak, even for as-deposited diamond layers, as noted by other authors [ 23 , 54 ].…”

Section: Resultsmentioning

confidence: 86%

The Effect of Surface Treatment on Structural Properties of CVD Diamond Layers with Different Grain Sizes Studied by Raman Spectroscopy

et al. 2021

View full text Add to dashboard Cite

Extensive Raman spectroscopy studies combined with scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) measurements were performed to investigate structural and chemical changes in diamond layers deposited by chemical vapour deposition (CVD) upon post-growth treatment with hydrogen. The aim of this study is to characterize the changes in micro-structural properties of diamond layers with different grain sizes and different contents of sp2 carbon phase. Hydrogenation or oxidization of diamond layer surface is often performed to modify its properties; however, it can also strongly affect the surface structure. In this study, the impact of hydrogenation on the structure of diamond layer surface and its chemical composition is investigated. Owing to their polycrystalline nature, the structural properties of CVD diamond layers can strongly differ within the same layer. Therefore, in this project, in order to compare the results before and after hydrogen treatment, the diamond layers are subjected to Raman spectroscopy studies in the vicinity of a T-shape marker fabricated on the surface of each diamond layer studied.

show abstract

Section: Resultsmentioning

confidence: 86%

The Effect of Surface Treatment on Structural Properties of CVD Diamond Layers with Different Grain Sizes Studied by Raman Spectroscopy

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The isothermal nonequilibrium seepage process of M-phase and N-component systems was studied. Given the diffusion of each component and the adsorption on the surface of porous media, − the continuity equation of component j in phase I can be written as follows: ∇ · [ ϕ D i j s i ∇ false( p j C i j false) ] − ∇ · ( p j V i C i j ) − ∑ a = 1 m η a i j ( φ i j − φ a j ) = ∂ ∂ t ( ϕ p j s i C i j + p j a i j ) − p j q i C i j …”

Section: Numerical Simulation Of Biological Nano-oil Displacementmentioning

confidence: 99%

Section: Numerical Simulation Of Biological Nano-oil Displacementmentioning

confidence: 99%

Research on Characterization Technology and Field Test of Biological Nano-oil Displacement in Offshore Medium- and Low-Permeability Reservoirs

Feng

Zhou

et al. 2022

ACS Omega

View full text Add to dashboard Cite

At present, the water displacement recovery in some medium-and low-permeability reservoirs that cannot be injected and produced in offshore oil fields because of small pores and complex structures is less than 18%. This amount is far lower than 25− 40%, which is obtained after water displacement and chemical displacement in medium-and high-permeability reservoirs. Given the current situation of water injection in offshore medium-and low-permeability reservoirs, a new green and environmentally friendly nano-oil displacement technology must be urgently developed to improve the sweep coefficient and oil displacement efficiency of injected water. In this study, the experimental laboratory investigation of a biological nano-oil displacement system suitable for medium-and low-permeability reservoirs is performed. The oil displacement effects, such as changing interfacial tension, viscosity reduction, and oil flushing ability, are also evaluated. The partial differential mathematical model of multicomponent isothermal multiphase seepage is deduced, the mechanism of biological nano-oil displacement technology is finely characterized, and a set of numerical simulation optimization charts of the biological nano-oil displacement process parameters is established. Results show that the biological nano-oil displacement system has adsorption characteristics in porous media, effective miscibility with crude oil, and a minimum contact angle reaching 14.3°. Its interfacial tension can be reduced to the 10 −3 level, the viscosity reduction efficiency can reach more than 90%, and the oil washing efficiency can reach more than 70%. Compared with the conventional water and chemical displacement systems, the displacement system in this study has a good oil rock flushing effect and improves oil recovery by 15%. When the injection−production ratio is comprehensively considered, the recommended injection cycle is 6000 ppm. The field test of the biological nano-oil displacement system has been completed, with a validity period of 1 year and a cumulative oil increase of 1.2 × 10 4 m 3 , which is still effective. This study provides environmentally friendly solutions for the new chemical displacement of offshore medium-and low-permeability reservoirs. The established process parameter optimization chart has important guiding relevance for the optimization of technical schemes and improvement of the oil increase effect in chemical displacement.

show abstract

Nanodiamond Coating in Energy and Engineering Fields: Synthesis Methods, Characteristics, and Applications

Zhao,

Song,

Zhang

et al. 2024

Small

View full text Add to dashboard Cite

Nanodiamonds are metastable allotropes of carbon. Based on their high hardness, chemical inertness, high thermal conductivity, and wide bandgap, nanodiamonds are widely used in energy and engineering applications in the form of coatings, such as mechanical processing, nuclear engineering, semiconductors, etc., particularly focusing on the reinforcement in mechanical performance, corrosion resistance, heat transfer, and electrical behavior. In mechanical performance, nanodiamond coatings can elevate hardness and wear resistance, improve the efficiency of mechanical components, and concomitantly reduce friction, diminish maintenance costs, particularly under high‐load conditions. Concerning chemical inertness and corrosion resistance, nanodiamond coatings are gradually becoming the preferred manufacturing material or surface modification material for equipment in harsh environments. As for heat transfer, the extremely high coefficient of thermal conductivity of nanodiamond coatings makes them one of the main surface modification materials for heat exchange equipment. The increase of nucleation sites results in excellent performance of nanodiamond coatings during the boiling heat transfer stage. Additionally, concerning electrical properties, nanodiamond coatings elevate the efficiency of solar cells and fuel cells, and great performance in electrochemical and electrocatalytic is found. This article will briefly describe the application and mechanism analysis of nanodiamonds in the above‐mentioned fields.

show abstract

Wettability modulation of nano-crystalline diamond films via in-situ CVD process

Cited by 9 publications

References 29 publications

The Effect of Surface Treatment on Structural Properties of CVD Diamond Layers with Different Grain Sizes Studied by Raman Spectroscopy

The Effect of Surface Treatment on Structural Properties of CVD Diamond Layers with Different Grain Sizes Studied by Raman Spectroscopy

Research on Characterization Technology and Field Test of Biological Nano-oil Displacement in Offshore Medium- and Low-Permeability Reservoirs

Nanodiamond Coating in Energy and Engineering Fields: Synthesis Methods, Characteristics, and Applications

Contact Info

Product

Resources

About