Molecular dynamics calculation of the vibrational spectra of OH groups in zeolites and on silica surfaces

Ermoshin, V. A.; Smirnov, Konstantin S.; Bougeard, D.

doi:10.1016/s0039-6028(96)01043-6

Cited by 28 publications

(43 citation statements)

References 13 publications

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“…The overall profile of this broad and intense band arises from different microenvironments due to different O(N)-HÁÁÁO(N) hydrogen bonding geometries, which are probed by FTIR. In fact this has been the aim of some research dealing with the overall band profile in this region [13][14][15][16][17].…”

Section: Resultsmentioning

confidence: 99%

Marine sponge melanin: a new source of an old biopolymer

et al. 2011

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Various types of melanin have already been found in the majority of organisms, being this biopolymer considered as one of the major pigments present in nature. The presence of this pigment in marine sponges (Phylum Porifera, one of the simplest multicellular organisms) was postulated, but never characterized. In this context this work aims the extraction and characterization of a dark pigment observed in four different marine sponges species (Erylus mamillaris, Erylus discophorus var. deficiens, Pachymatisma johnstonia, Dercitus bucklandi). Characterization of the extracted biopolymer was performed using solid state analytical techniques, due to the characteristic non-solubility of melanin. Therefore, characterization techniques like SEM-EDS, IR, UV-vis, MALDI-MS, elemental analysis and X-ray powder diffraction (XRD) were used to identify the biopolymer. The results showed that the extracted material was obtained with high purity, being identified as melanin. The results also emphasize a large structure variability present in this pigment, showing different structure arrangements and composition depending on its source, which influences the UV behaviour. The structural characterization of this class of pigments is fundamental, allowing a better understanding of melanin properties.

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Section: Resultsmentioning

confidence: 99%

Marine sponge melanin: a new source of an old biopolymer

et al. 2011

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“…The band at 935 cm À1 is assigned to the stretching vibration of a small amount of Si-OH groups. [27][28][29] Figure 1(d) related to the XPS spectrum shows the elemental composition of deposited SiO 2 film. The binding energy peaks are corresponding to Si2s, Si2p, and O1s of SiO 2 film.…”

Section: A Hydrophilic Properties Of Sio 2 Surfacementioning

confidence: 99%

Hydroxyapatite-TiO2-SiO2-Coated 316L Stainless Steel for Biomedical Application

Sidane

Khireddine

Bir

et al. 2017

Metall Mater Trans A

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This study investigated the effectiveness of titania (TiO 2) as a reinforcing phase in the hydroxyapatite (HAP) coating and silica (SiO 2) single layer as a bond coat between the TiO 2-reinforced hydroxyapatite (TiO 2 /HAP) top layer and 316L stainless steel (316L SS) substrate on the corrosion resistance and mechanical properties of the underlying 316L SS metallic implant. Single layer of SiO 2 film was first deposited on 316L SS substrate and studied separately. Water contact angle measurements, X-ray photoelectron spectroscopy, and Fourier transform infrared spectrophotometer analysis were used to evaluate the hydroxyl group reactivity at the SiO 2 outer surface. The microstructural and morphological results showed that the reinforcement of HAP coating with TiO 2 and SiO 2 reduced the crystallite size and the roughness surface. Indeed, the deposition of 50 vol pct TiO 2-reinforced hydroxyapatite layer enhanced the hardness and the elastic modulus of the HAP coating, and the introduction of SiO 2 inner layer on the surface of the 316L SS allowed the improvement of the bonding strength and the corrosion resistance as confirmed by scratch studies, nanoindentation, and cyclic voltammetry tests.

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“…These dyes undergo different types of aggregation or self-association in or on water, which may be of H-or J-type consisting of parallel dye molecules stacked in plane-to-plane or end-to-end manner leading to hypsochromism or bathochromism respectively. N-alkyl styryl pyridinium dyes (17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32) were used extensively as probes 17: R = Butyl, X = p-OMe; 18: R = Butyl, X = p-NMe 2 ; 19: R = Amyl, X = p-OMe; 20: R=Amyl, X=p-NMe 2 ; 21: R = Cetyl, X = p-NMe 2 .…”

Section: Adsorption Of Dyes On Silica Surfacementioning

confidence: 99%