Papers by Keyword: Alternate Soaking

Abstract: Hetero-epitaxial growth of calcite crystals on calcium dodecyl sulfate (Ca(DS)2 = CDS) single crystals was studied by alternate soaking method. The calcite (006) oriented single crystals grow on the (001) surface of the CDS. The hetero-epitaxial growth mechanism is discussed by the lattice matching of the a-c planes of calcite and CDS according to the structure data of the CDS single crystal.

Abstract: Hydroxyapatite coating was prepared by alternate soaking strategy in short period time and ambient condition. According to the pH near equality between chitosan acidic acid solution and H2PO4 - aqueous solution, we proposed to choose H2PO4 - as one of hydroxyapatite precursor instead of traditional candidate (HPO4 2-). The properties of chitosan hydrogel containing plenty of water provide enough spaces for hydroxyapatite precursor to diffuse into framework spontaneously. XRD, FTIR and SEM were used to characterize the component and microstructure of mineralized chitosan. The ageing process helps to transfer amorphous calcium phosphate in chitosan framework into hydroxyapatite. The hydroxyapatite coating is gradient structure according to the result of SEM.

Abstract: An apatite coating by an alternate soaking was undertaken on commercially pure titanium (cpTi) treated with concentrated acid and alkaline solutions. X-ray diffraction (XRD) patterns indicated that the diffraction peak intensities assigned to hydroxyapatite (HAp) increased with the reaction cycle. Fourier transform infrared spectroscopic study (FTIR) showed similar results with XRD. Scanning electron micrographs (SEM) of the deposits showed no observable change after the vacuum firing. It was confirmed that the reaction cycle greatly affected on the deposited amount of apatite on cpTi plates using the alternate soaking and the vacuum firing erased TiH2 formed during the acid etching, but was irrelevant to the crystallinity of the apatite.