Water adsorption on fullerene-like carbon nitride overcoats

Broitman, Esteban; Gueorguiev, Gueorgui Kostov; Furlan, Andrej; Son, N. T.; Gellman, Andrew J.; Stafström, Sven; Hultman, Lars

doi:10.1016/j.tsf.2008.07.022

Cited by 44 publications

(40 citation statements)

References 22 publications

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“…using quarts crystal microbalance (QCM) measurements which showed that amorphous structures of carbon and CN x adsorbed 10 times more water compared to the nano-structured films, and rough surfaces adsorbed more than smooth films [45,46]. Those results, regarding the nano-structure, are in apparent contradiction with the present work since the a-C and a-CN x films showed larger protein adsorption compared to the nano-structured films.…”

Section: Morphology and Adsorptioncontrasting

confidence: 96%

Protein adsorption on thin films of carbon and carbon nitride monitored with in situ ellipsometry

et al. 2011

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Amorphous carbon and amorphous, graphitic and fullerene-like carbon nitride thin filmswere deposited by reactive magnetron sputtering and optically characterized withspectroscopic ellipsometry. The films were exposed to human serum albumin and theadsorption was monitored in situ using dynamic ellipsometry. From the ellipsometric data theadsorbed amount of proteins was quantified in terms of surface mass density using de Feijter'smodel. The results indicated larger adsorption of proteins onto the amorphous films comparedto the films with a more ordered microstructure. Complementary studies with labeled HSAusing radioimmunoassay showed up to 6 times higher protein adsorption compared to theellipsometry measurement which partly might be explained by differences in surfaceroughness (from 0.3 to 13 nm) among the films. The elutability of adsorbed labeled HSAusing unlabeled HSA and sodium dodecyl sulphate was low compared to a silicon reference.In addition, the four types of films were incubated in blood plasma followed by antifibrinogen,anti-HMWK or anti-C3c revealing the materials response to complement andcontact activation. Three of the films indicated immunoactivity, whereas the amorphouscarbon showed less immunoactivity compared to a titanium reference. All films showedindications of a stronger ability to initiate the intrinsic pathway of coagulation, compared tothe reference. Finally, the surfaces bone bonding ability was investigated by examination oftheir ability to form calcium phosphate (CaP) crystals in a simulated body fluid, with a-CNxdepositing most CaP after 21 days of incubation.Original Publication:Torun Berlind, Pentti Tengvall, Lars Hultman and Hans Arwin, Protein adsorption on thin films of carbon and carbon nitride monitored with in situ ellipsometry, 2011, ACTA BIOMATERIALIA, (7), 3, 1369-1378.http://dx.doi.org/10.1016/j.actbio.2010.10.024Copyright: Elsevier Science B.V. Amsterdamhttp://www.elsevier.com

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Section: Morphology and Adsorptioncontrasting

confidence: 96%

Protein adsorption on thin films of carbon and carbon nitride monitored with in situ ellipsometry

et al. 2011

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“…Figure 2 shows the adsorption of water versus the water vapor pressure for different carbon-based films: amorphous carbon (a-C), amorphous carbon nitride (a-CN x ), and fullerene-like carbon nitride [12]. All carbon-based films show a similar dependence of water coverage on the H 2 O vapor pressure.…”

Section: Cn X Nanoscale Computer Simulationsmentioning

confidence: 99%

“…There are, however, differences in the amounts of the adsorbed water: (i) FL-CN x shows the lower adsorption rate. Taking into consideration one monolayer coverage is roughly 30 ng/cm 2 and that at room temperature 13.3 × 10 2 Pa of H2O vapor pressure is equivalent to 50% RH [12], these films adsorb less than 2 ML at that pressure; (ii) a-CN x has adsorbed roughly 2-3 times more water than FL-CN x . (iii) Finally, a-C adsorbs more than 14 times the amount adsorbed by FL-CN x .…”

Section: Cn X Nanoscale Computer Simulationsmentioning

confidence: 99%

The nature of the frictional force at the macro-, micro-, and nano-scales

Broitman

2014

Friction

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Nowadays it is accepted that the friction force is a combined effect arising from various phenomena: adhesive forces, capillary forces, contact elasticity, topography, surface chemistry, and generation of a third body, etc. Any of them can dominate depending on the experimental force and length scales of the study. Typical forces in macro-tribology are in the Newtons, while are reduced to milli-/micro-Newtons, and nano-Newtons in microand nano-tribology, respectively. In this paper, experimental friction results from fullerene like CNx films and single-crystal Si at the three scales will be discussed. The complex and broad variety of processes and phenomena connected with the dry friction coefficient at the macro-, micro-, and nano-scale point of view will be highlighted.

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“…As a model system, we have selected carbon nitride (CN x ), which is proposed as the best candidate to replace diamond-like carbon (DLC) films due to their superior wear resistance, high hardness, and low friction coefficient [1]. The first successful industrial application of this material has been the use of very thin (~2-5 nm) films for the protection of hard disks [2,3]. However, the scalability of CN x coatings produced in laboratories to industrial engineering applications has been difficult as thicker films (1-5 m) on steel substrates are required.…”

Section: Introductionmentioning

confidence: 99%

Industrial-scale deposition of highly adherent CNx films on steel substrates

Broitman

Czigány

Greczyński

et al. 2010

Surface and Coatings Technology

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Highly adherent carbon nitride (CN x ) films were deposited using a novel pretreatment with two high power impulse magnetron sputtering (HIPIMS) power supplies in a master-slave configuration: one to establish the discharge and one to produce a pulsed substrate bias. During the pretreatment, SKF3 (AISI 52100) steel substrates were pulse-biased in the environment of a HIPIMS Cr plasma in order to sputter clean the surface and to implant Cr metal ions. Subsequently, CN x films were prepared at room temperature by DC unbalanced magnetron sputtering from a high purity graphite target in a N 2 /Ar discharge at 3 mTorr. All processing was done in an industrial CemeCon CC800 system. A series of

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Water adsorption on fullerene-like carbon nitride overcoats

Cited by 44 publications

References 22 publications

Protein adsorption on thin films of carbon and carbon nitride monitored with in situ ellipsometry

Protein adsorption on thin films of carbon and carbon nitride monitored with in situ ellipsometry

The nature of the frictional force at the macro-, micro-, and nano-scales

Industrial-scale deposition of highly adherent CNx films on steel substrates

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