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Dip-coating Method (dip-coating + method)

Distribution by Scientific Domains
Polymers and Materials Science60%

Selected Abstracts

Hydroxyapatite/Bioactive Glass Films Produced by a Sol,Gel Method: In Vitro Behavior

ADVANCED ENGINEERING MATERIALS, Issue 11 2009
Nihat C. Köseo
Abstract Hydroxyapatite (HA) and HA/bioactive glass (49S) films were deposited on Si(100) substrates by a sol,gel dip-coating method. The microstructure and in vitro bioactivity of the films were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). Polycrystalline HA and amorphous bioactive glass films were obtained after annealing at 600 and 400,°C, respectively. The crystallization temperature of HA was determined to be around 568,°C. The surfaces of the HA films were covered with an apatite layer consists of spherulites formed by nanosized needle-like aggregates after the soaking in simulated body fluid (SBF) for 10 days, while amorphous HA/bioactive glass surface was covered with larger spherical crystallites. Both XPS and EDS results obtained from HA/bioactive glass film, after soaking in SBF, showed increasing P amounts on the surface at the expense of Si. The higher density of the newly formed layer on HA/bioactive glass surface than that of the HA surface after 10 days of soaking was evidence of increased reaction rate and apatite forming ability when bioactive glass layer is present on the HA films. [source]

Macroscopic Single-Walled-Carbon-Nanotube Fiber Self-Assembled by Dip-Coating Method

ADVANCED MATERIALS, Issue 43 2009
Eui Yun Jang
Pure macroscopic single-walled-carbon-nanotube (SWNT) fibers are fabricated by using a dip-coating method without any additive or additional electrical equipment or complex apparatus. The present method only utilizes microfluidics, which includes capillary condensation, capillary flow, and surface tension, and results in the self-assembly and self-alignment of SWNT colloids. [source]

Colloidal Route for Preparing Optical Thin Films of Nanoporous Metal,Organic Frameworks

ADVANCED MATERIALS, Issue 19 2009
Patricia Horcajada
Colloids of a highly flexible porous metal-organic framework (MOF) have been prepared using nontoxic and easily removable solvents. Furthermore, a simple dip-coating method for the preparation of optical-quality thin films of the MOF has been developed. The homogeneous thin film exhibits reversible flexibility, as has been proven by environmental ellipsometry. [source]

Photodegradation of Methanol Under UV,Visible Irradiation by Titania Dispersed on Polyester Cloth

PHOTOCHEMISTRY & PHOTOBIOLOGY, Issue 2 2010
Kaustava Bhattacharyya
Titania supported on polyester fabric (TiO2,PY) with varying titania loadings (2,7 wt%) were prepared via the dip-coating method at room temperature using an aqueous slurry of anatase titania. Structural and morphological characterizations by X-ray diffraction and scanning electron microscopy revealed that the titanium dioxide crystallites deposited on the surface of the polyester fabric were in the micrometer range while their phase remained to be anatase. Photocatalytic activity of TiO2,PY fabric catalysts was evaluated for vapor-phase oxidation of methanol in air as a test reaction in the presence of UV as well as solar radiation under ambient conditions. These catalysts were found to be quite active in both UV and solar irradiation with activity being higher in the former case. CO2 yield from photo-oxidation of methanol depended on titania content and also on its dispersion over polyester fabric support. [source]

Electrical resistance variation of carbon-nanotube networks due to surface modification of glass substrate

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 8 2010
Eui Yun Jang
Abstract This study presents the effect of the wettability between a glass substrate and carbon-nanotube (CNT) colloidal solution on the density of CNT networks in a dip-coating process. The surface roughness and the density of functional groups of the glass substrate were modified by using an oxygen-plasma treatment, and then we observed the density of CNT networks with respect to different surface conditions due to the surface modification. It is confirmed that the surface chemical property and the surface morphology of the glass substrate determines the density of CNT networks formed by the dip-coating method. The change of surface free energy induced by hydroxylation and hydration enhances the wettability between a glass substrate and CNT colloidal solution. Moreover, the effective area on which silanol groups can be formed is dependent on the roughness of the surface of the substrate. Eventually, the change of the surface free energy due to the hydroxylation, hydration, and surface roughness effect on the density of the coated CNTs, which determines the sheet resistance of CNT networks. [source]