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The Studies of Diamond-Like Carbon Films as Biomaterials: Review
Feng Wen,
Jiaqi Liu,
Jianlu Xue
Issue:
Volume 2, Issue 3, September 2017
Pages:
81-95
Received:
6 June 2017
Accepted:
20 June 2017
Published:
26 July 2017
DOI:
10.11648/j.css.20170203.11
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Abstract: Diamond-like carbon (DLC) films have been given great attention in the last twenty years as candidate biomaterials due to its super mechanical property and bio-compatibilities. In this paper, many synthesis methods of DLC films are presented, and some researches related with DLC films applied on cardiovascular biomedical materials are mentioned. Many synthesis methods of DLC films are also presented. Research theories and analysis methods of materials hemo-compatibility are also shown in detail. Two kinds of main evaluation methods aimed to two different coagulation pathways are also introduced here. It has also been illustrated that different biomedical applications about non-doped and element-doped DLC films in different studies. However, because of the uncontrollable accurate ratio of sp3/sp2 in the films and imperfect evaluation methods of hemo-compatibility, an unremitting effort is essential so that DLC films can be better qualified as biomaterials.
Abstract: Diamond-like carbon (DLC) films have been given great attention in the last twenty years as candidate biomaterials due to its super mechanical property and bio-compatibilities. In this paper, many synthesis methods of DLC films are presented, and some researches related with DLC films applied on cardiovascular biomedical materials are mentioned. Ma...
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The Mechanism of Surfactant Assisted Dispersion of Single-Walled Carbon Nanotubes in Polyvinylpyrrolidone Solutions
Tennison Yu,
Jose Efrain Herrera
Issue:
Volume 2, Issue 3, September 2017
Pages:
96-106
Received:
9 June 2017
Accepted:
26 June 2017
Published:
27 July 2017
DOI:
10.11648/j.css.20170203.12
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Abstract: Single walled carbon nanotubes (SWNTs) are an extremely attractive material due to their unmatched electronic, mechanical, and thermal properties, however; their hydrophobicity results in strong van der Waals interactions. This, combined with extremely high aspect ratios and flexibility, causes SWNTs to adhere strongly into tightly bundled ropes. In these bundles, SWNTs are not as useful as their linearized unbundled equivalents. In this contribution, the characterization of a system containing SWNTS, centrimonium bromide (CTAB) and the polymer, polyvinylpyrrolidone (PVP) is reported. Results indicate that although individually CTAB and PVP are poor dispersants of SWNTs, together they show a synergic effect. Characterizations studies on the obtained SWNT dispersions suggest that the polymer hydrodynamic radius should have a minimum length that corresponds to intertube separation distance to achieve stable nanotube dispersions and that the effective polymer contact area with the suspended nanotube, rather than the polymer molecular weight regulates ability for SWNT dispersion. The results present a series of considerations that are relevant for the use of polymers as nanotube dispersing agents and an overall facile way of augmenting current dispersion techniques, potentially allowing for increased usage of applications of these versatile materials.
Abstract: Single walled carbon nanotubes (SWNTs) are an extremely attractive material due to their unmatched electronic, mechanical, and thermal properties, however; their hydrophobicity results in strong van der Waals interactions. This, combined with extremely high aspect ratios and flexibility, causes SWNTs to adhere strongly into tightly bundled ropes. I...
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Computer Simulation of the Dielectrics Properties in the Dense Circles
Alioune Aidara Diouf,
Bassirou Lo,
Famara Dieme,
Abdourahmane Mbodji,
Aboubaker Chedikh Beye
Issue:
Volume 2, Issue 3, September 2017
Pages:
107-113
Received:
10 June 2017
Accepted:
27 June 2017
Published:
27 July 2017
DOI:
10.11648/j.css.20170203.13
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Abstract: To investigate the dielectric properties in the dense circles a program based on the Lorentz model is implemented. So, to understand the importance of the certain physical parameters (spectral width, specific pulsation and the number of particle) on the dielectric properties of the dense media, one varied these parameters to observe their influence on the real and imaginary susceptibility as well as the indication of the environment. Besides knowing that the Drude model is a particular case of the Lorentz model, a comparative investigation has been done to observe their behavior according to certain parameters.
Abstract: To investigate the dielectric properties in the dense circles a program based on the Lorentz model is implemented. So, to understand the importance of the certain physical parameters (spectral width, specific pulsation and the number of particle) on the dielectric properties of the dense media, one varied these parameters to observe their influence...
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Structural Analysis of Glass Fiber / Epoxy and Basalt Fiber / Epoxy Lap Joint Specimens Using FEA
Mohamed Bak Kamaludeen,
Kalaichelvan Kani
Issue:
Volume 2, Issue 3, September 2017
Pages:
114-117
Received:
7 June 2017
Accepted:
30 June 2017
Published:
1 August 2017
DOI:
10.11648/j.css.20170203.14
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Abstract: The aim of this work is to predict the crack initiation and failure based on the Von Mises stress distributions at the edge of the overlap region. Finite Element Analysis (FEA) software is used to investigate the stress distribution under tensile loading on composite lap joints. From the Von Mises stresses results, the bonded joint and hybrid joint of basalt-fiber reinforced plastic (BFRP) specimen’s produces higher results than bonded joint and hybrid joint of glass-fiber reinforced plastic (GFRP) specimens due to higher interfacial bonding strength. A well-designed bonded joint of BFRP laminates is very efficient for composite lap joint structures compared to hybrid (boned/riveted) joints. It is suggested that the application of basalt/epoxy laminate as a strengthening material is useful for joining of composite structural members in the engineering fields.
Abstract: The aim of this work is to predict the crack initiation and failure based on the Von Mises stress distributions at the edge of the overlap region. Finite Element Analysis (FEA) software is used to investigate the stress distribution under tensile loading on composite lap joints. From the Von Mises stresses results, the bonded joint and hybrid joint...
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Interaction of Water with Silane Modified Aerosil Samples
Misael Silas Nadiye-Tabbiruka
Issue:
Volume 2, Issue 3, September 2017
Pages:
118-124
Received:
26 June 2017
Accepted:
10 July 2017
Published:
9 August 2017
DOI:
10.11648/j.css.20170203.15
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Abstract: The interaction of water with pre-heat treated silylated aerosil samples was investigated by adsorption of water and by contact angle measurements at 293 K. Type II adsorption isotherms were obtained. The resulting BET specific surface areas were found to depend on pre-treatment. Contact angles were measured by the captive bubble method at the three phase contact line in water, on glass slides similarly modified. Silylation was found to decrease water adsorption on aerosil and increase the contact angles on the glass slides to extents that depend on the silane used as well as the concentration of residual silanols and on concentration and size of surface silyl groups.
Abstract: The interaction of water with pre-heat treated silylated aerosil samples was investigated by adsorption of water and by contact angle measurements at 293 K. Type II adsorption isotherms were obtained. The resulting BET specific surface areas were found to depend on pre-treatment. Contact angles were measured by the captive bubble method at the thre...
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