Ranald C. Michie, The Global Securities Market: a History (Oxford: Oxford University Press, 2006, x + 399 pp. £60.00)

Attard, Bernard

doi:10.1017/s0968565007000571

Cited by 19 publications

(33 citation statements)

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“…The decrease in WF values has also been associated with a reduction in the net surface dipole. 29 Bolz and Schaldach 14 have already proposed that the early stages of thrombus formation are preceded by an electron transfer oxidation process, resulting in the transformation of fibrinogen to a fibrin polymer. We observed a substantial increase in the number of adherent endothelial cells in the Si-DLC compared to the DLC films as shown in Figure 7, but further silicon addition did not lead to any substantial change in the number of adherent cells on the Si-DLC film surface.…”

Section: Discussion Surface Energy Contact Potential Difference Andmentioning

confidence: 99%

“…The reduction in WF of the Si-DLC films compared to the asprepared DLC films, we believe is associated with the creation of new defect states in the band-gap of the Si-DLC films through the formation of clusters like the sp 3 rich Si-H clusters. The presence of silicon and hydrogen in the hydrogenated DLC (a-C:H) films, that are more electropositive than carbon 29,31 will result in the formation a surface dipole with an external positively charged side on the silicon doped DLC film. Electropositive elements like caesium are well known to reduce the WF of more electronegative surfaces.…”

Section: Discussion Surface Energy Contact Potential Difference Andmentioning

confidence: 99%

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Endothelial cell growth on silicon modified hydrogenated amorphous carbon thin films

et al. 2007

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The biological response of human microvascular endothelial cells (HMEC-1) seeded on Si-DLC films and on control surfaces was evaluated in terms of initial cell enhancement, growth, and cytotoxicity. The microstructure of the films was characterised by Raman spectroscopy and X-ray photoelectron spectroscopy. The effect of changes in microstructure, surface energy, surface electronic state, and electronic conduction, on the biological response of the films to endothelial cells was investigated. Endothelial cell adhesion and growth was found to be affected by changes in the microstructure of the films induced by silicon doping and thermal annealing. We observed a significant statistical difference in endothelial cell count between the as-deposited DLC and Si-DLC films using the one sample t-test at a p-value of 0.05. We also found a statistically significant difference between the adhesion of HMEC films on DLC and Si-DLC films at various annealing temperatures using the one-way ANOVA F statistic test at p < 0.05 and the post-hoc Tukey test. One sample t-test at p < 0.05 of MTT-assay results showed the endothelial cells to be viable when seeded on DLC/Si-DLC films. We suspect that the increased adhesion of endothelial cells induced by increasing the amount of silicon in the Si-DLC films is associated with the development of a suitable surface energy due to silicon addition, which neither favored cell denaturing nor preferential water spreading before cellular attachment on the film surface. The presence of an external positively charged dipole on the Si-DLC films confirmed by our Kelvin probe measurements is also expected to enhance the adhesion of endothelial cells that are well known to carry a negative charge. The Si-DLC films investigated hold potential promise as coatings for haemocompatible artificial implants.

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Section: Discussion Surface Energy Contact Potential Difference Andmentioning

confidence: 99%

Section: Discussion Surface Energy Contact Potential Difference Andmentioning

confidence: 99%

Endothelial cell growth on silicon modified hydrogenated amorphous carbon thin films

et al. 2007

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“…In porous materials, physically adsorbed VOC always exist at the pore surfaces due to the van der Waal's forces (Ruthven, 1984). Since any VOC can move freely from adsorbed phase to gas phase, or vice versa to satisfy surface equilibrium (Attard and Barnes, 1998), it is not possible to separate the free VOC from the physically adsorbed VOC in describing the VOC transfer. To eliminate any confusion that may arise from the terminology, the terms used in this work are defined as follows:…”

Section: Introductionmentioning

confidence: 99%

A study on VOC source and sink behavior in porous building materials - analytical model development and assessment

Lee¹,

Haghighat²,

Ghaly

2005

Indoor Air

105

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Building materials can strongly affect indoor air quality. Porous building materials are not only sources of indoor air pollutants such as volatile organic compounds (VOC) but they are also strong sinks of these pollutants. The knowledge of VOC transfer mechanisms in these materials is an important step for controlling the indoor VOC concentration levels, and for determining the optimum ventilation requirements for acceptable IAQ. This study provides a theoretical investigation of primary and secondary VOC source and sink behavior of porous building materials. A new analytical model was developed based on the fundamental theories of mass transfer mechanisms in porous materials. The proposed model considers both primary and secondary source/sink behavior for the first time. The former refers to the transfer of gas-phase and/or physically adsorbed VOC, while the latter refers to the generation or elimination of VOC within the solid because of chemical reactions like oxidation, hydrolysis, chemical adsorption, etc. The proposed model was assessed with experimental data, namely emission tests of carpets and sorption tests of wood chipboard. It was demonstrated that, unlike the existing analytical models, the proposed analytical model could simultaneously account for the effect of air velocity on both VOC source as well as sink behavior. Case studies were then carried out for secondary VOC source behavior. Due to the lack of experimental studies on mechanisms of secondary behavior, hypothetical generation functions were implemented. It was demonstrated that the proposed analytical model is suitable for describing various mechanisms involved in the secondary behavior due to the little limitations imposed on the generation/elimination term. When VOC generation takes place at the material-air interface, the simulation shows that although the primary emission is not affected by air velocity, the secondary emission, however, is clearly affected. This behavior agrees with the available experimental findings on secondary emissions. PRACTICAL IMPLICATION: The analytical model presented in this paper can predict both primary and secondary VOC source (emission) or sink (sorption) behavior of porous building materials. Since the model considers diffusion and adsorption/desorption within the material, and convection over the material surface, the simulation using the model can readily provide the effects of material properties and airflow properties on the primary and/or the secondary behavior, hence, it can provide a better understanding on the mechanisms. This will enable us to keep the indoor VOC concentration within a desirable level.

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“…The value obtained was KJ/mol. This suggests a chemical interaction for the above system [21]. The atomic charges were calculated for the oxygen and nitrogen atoms of the nitro functional group of the Cu-o-DNB and o-DNB.…”

Section: Copper Atom and O-dnb Interactionmentioning

confidence: 99%

SERS and Density Functional Theory Study of o-Dinitrobenzene on Cu Nanoparticles

et al. 2010

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Cu colloidal suspensions were prepared by wet chemistry methods: chemical reduction using trisodium citrate. Steadiness varied under conditions such as stirring rate, rate of addition of reducing agent, and temperature control. Sizes of nanoparticles prepared ranged from 2 to 20 nm. Morphology and sizes were characterized using high-resolution transmission electron microscopy. Enhanced Raman spectra of -dinitrobenzene on prepared nanoparticles suspensions of Cu colloids were obtained with visible excitation at 488 and 514.5 nm. It was found that enhanced Raman signal intensities resulted from the interaction of the analytes with the metallic surface resonance plasmon of Cu nanoparticles excited at the laser frequency. The adsorption behavior of the analytes on the Cu nanoparticles was modeled with Gaussian 03 density functional theory software package. The simplified models used work reasonably well in describing some enhancement results for the Raman experiments on the noble metal colloidal suspensions.Index Terms-Cu nanoparticles, density functional theory (DFT), dinitrobenzenes (DNB), metallic colloidal suspensions, surface-enhanced Raman scattering (SERS).

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Ranald C. Michie, The Global Securities Market: a History (Oxford: Oxford University Press, 2006, x + 399 pp. £60.00)

Cited by 19 publications

References 0 publications

Endothelial cell growth on silicon modified hydrogenated amorphous carbon thin films

Endothelial cell growth on silicon modified hydrogenated amorphous carbon thin films

A study on VOC source and sink behavior in porous building materials - analytical model development and assessment

SERS and Density Functional Theory Study of o-Dinitrobenzene on Cu Nanoparticles

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