Mechanism of enhanced wettability of nanocrystalline diamond films by plasma treatment

Yang, Jason Hsiao Chun; Teii, Kungen

doi:10.1016/j.tsf.2012.06.041

Cited by 18 publications

(11 citation statements)

References 35 publications

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“…After 72 h, the polar component and surface free energy of 304CuSS were still 1.5 mJ m À2 and 1.3 mJ m À2 lower than those of 304SS, respectively. Thus we can draw a conclusion that the polar component was the main factor that changed within the immersion time, and the polar component of the surface of 304CuSS was lower than that of the surface of 304SS [54,55] .…”

Section: Surface Free Energymentioning

confidence: 84%

“…It was believed [54] that the wettability of a material depended upon the surface free energy, and the increase of the polar component contributed to the increase of the wettability. The lower the polar component was, the less likely the surface to be wet-out.…”

Section: Surface Free Energymentioning

confidence: 99%

“…The lower the polar component was, the less likely the surface to be wet-out. The number of organic groups and the surface properties or composition of the metals were the factors that affect the polar component [54,55] . For the oxidation of a given metal, carbon, oxygen and nitrogen were adopted onto the surface of the metal to form different organic compounds that became the source of the growth and propagation of bacteria [43,56] .…”

Section: Surface Free Energymentioning

confidence: 99%

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Antibacterial Performance of a Cu-bearing Stainless Steel against Microorganisms in Tap Water

et al. 2015

Journal of Materials Science & Technology

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Date of Acceptance: 11/11/2014Tap water is one of the most commonly used water resources in our daily life. However, the increasing water contamination and the health risk caused by pathogenic bacteria, such as Staphylococcus aureus and Escherichia coli have attracted more attention. The mutualism of different pathogenic bacteria may diminish antibacterial effect of antibacterial agents. It was found that materials used for making pipe and tap played one of the most important roles in promoting bacterial growth. This paper is to report the performance of an innovative type 304 Cu-bearing stainless steel (304CuSS) against microbes in tap water. The investigation methodologies involved were means of heterotrophic plate count, contact angle measurements, scanning electron microscopy for observing the cell and subtract surface morphology, atomic absorption spectrometry for copper ions release study, and confocal laser scanning microscopy used for examining live/dead bacteria on normal 304 stainless steel and 304CuSS. It was found that the surface free energy varied after being immersed in tap water with polar component and Cu ions release. The results showed 304CuSS could effectively kill most of the planktonic bacteria (max 95.9% antibacterial rate), and consequently inhibit bacterial biofilms formation on the surface, contributing to the reduction of pathogenic risk to the surrounding environments

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Section: Surface Free Energymentioning

confidence: 84%

Section: Surface Free Energymentioning

confidence: 99%

Section: Surface Free Energymentioning

confidence: 99%

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Antibacterial Performance of a Cu-bearing Stainless Steel against Microorganisms in Tap Water

et al. 2015

Journal of Materials Science & Technology

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“…7 This technique was used to investigate the interaction of the diamond surface with several small molecules. 11 This change alters the adhesion 12 and the orientation 13 of organic molecules on the diamond and the change in orientation can additionally change the positions of the molecular orbitals in the film. 8 Whether an efficient and direct charge transfer occurs depends on the alignment of the highest occupied molecular orbital and the lowest unoccupied molecular orbital of the molecules with respect to the conduction band minimum (CBM), valence band maximum (VBM) and the Fermi level of the diamond.…”

mentioning

confidence: 99%

“…The A 1 tensor is diagonal and moreover for these calculations the approximation A 1[33] = 0 can be used since A 1[33] { A 1 [11] = A 1 [22] for phthalocyanines. In a general case, the integration must include the distribution function of the molecular orientations.…”

mentioning

confidence: 99%

Molecular orientation of lead phthalocyanine on (100) oriented single crystal diamond surfaces

Dexters

Bourgeois

Nesládek

et al. 2015

Phys. Chem. Chem. Phys.

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Lead phthalocyanine (PbPc) thin films of 5 and 50 nm have been deposited on hydrogen and oxygen terminated single crystal diamond (SCD) using organic molecular beam deposition. Atomic force microscopy and X-ray diffraction (XRD) studies showed that PbPc grown on the hydrogen terminated SCD forms layers with a high degree of crystallinity, dominated by the monoclinic (320) orientation parallel to the diamond surface. The oxygen terminated diamond led to a randomly oriented PbPc film. Absorption and photocurrent measurements indicated the presence of both polymorphs of PbPc, however, the ratio differed depending on the termination of the SCD. Finally, polarized Raman spectroscopy was used to determine the orientation of the molecules of the thin film. The results confirmed the random orientation on the O-terminated diamond. On SCD:H, the PbPc molecules are lying down in accordance with the XRD results.

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Biocompatible Cubic Boron Nitride: A Noncytotoxic Ultrahard Material

Yang

Teii

Chang

et al. 2020

Adv Funct Materials

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Cubic boron nitride (c‐BN) has an ultrahardness and a large bandgap energy like diamond. In the last 30 years, most of the attention has been directed towards the mechanical and electronic applications of c‐BN, while its biological potential has been overlooked. The authors report in vitro biocompatibility of high‐quality c‐BN films prepared by plasma‐enhanced chemical vapor deposition using the chemistry of fluorine. c‐BN films become superhydrophilic when chemical‐treated in hydrogen and nitrogen plasmas with or without the impact of low‐energy ions due to a marked increase in polar part of the surface free energy by removal of the fluorine atoms terminating c‐BN surfaces. Satisfactory proliferation and differentiation of osteoblastic cells comparable with a control sample and a superhydrophilic nanocrystalline diamond film, and the formation of mineral deposits by biomineralization are confirmed on the superhydrophilic c‐BN films with negative values of zeta potential. The results demonstrate a high potential of c‐BN as a noncytotoxic ultrahard coating material for biological and biomedical applications.

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Mechanism of enhanced wettability of nanocrystalline diamond films by plasma treatment

Cited by 18 publications

References 35 publications

Antibacterial Performance of a Cu-bearing Stainless Steel against Microorganisms in Tap Water

Antibacterial Performance of a Cu-bearing Stainless Steel against Microorganisms in Tap Water

Molecular orientation of lead phthalocyanine on (100) oriented single crystal diamond surfaces

Biocompatible Cubic Boron Nitride: A Noncytotoxic Ultrahard Material

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