Sol-Gel SiO2-CaO-P2O5 biofilm with surface engineered for medical application

Federman, Sonia Regina; Costa, Vilma C.; Vasconcelos, Daniela C.L.; Vasconcelos, Wander L.

doi:10.1590/s1516-14392007000200014

Cited by 22 publications

(15 citation statements)

References 25 publications

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“…Here, we suggest that the hydrolysis-condensation of TEOS in phosphoric acid brings about the rearrangement of the Si, O and P positions, and a mixed silicophosphate network containing Si-O-Si, P-O-P and Si-O-P bonds was formed because of the pre-hydrolysis of the TEOS in the presence of the phosphoric acid [3]. The inorganic nuclei in the aqueous viscous sol solution are condensed into a solid gel (hydrolysis-condensation reactions), and form a coreshell structure in the emulsion system, similar to the one previously reported [5].…”

Section: Resultssupporting

confidence: 74%

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Preparation of P2O5-SiO2 hollow microspheres in the presence of phosphoric acid

Xie

Hua

et al. 2011

Front. Chem. Sci. Eng.

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Silica hollow microspheres containing phosphorous have been prepared by a sol-gel/emulsion method which uses tetraethoxysilane (TEOS) as the precursor for the SiO 2 and phosphoric acid (H 3 PO 4 ) as the precursor for P 2 O 5 . The hollow structure forms an emulsion system which is composed of an oil phase (kerosene, sorbitan monooleate (Span 80)) and an aqueous phase (a viscous sol solution of ethanol, TEOS and H 3 PO 4 ). Some of the phosphorous remains in the final silica shell structure even after calcination at 650°C. The hollow structure of the P 2 O 5 -SiO 2 (silicophosphate) was characterized by X-ray diffraction (XRD), polarized optical microscopy (POM), scanning electron microscopy (SEM), nitrogen adsorption measurement and Fourier transform infrared spectroscopy (FTIR).

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Section: Resultssupporting

confidence: 74%

“…Silicate containing phosphorus has attracted much attention because of its applications in microelectronics, electrical systems, medical implants and power engineering [1][2][3][4][5]. Sol-gel processes can provide low-temperature and convenient processing routes to mix materials into sol solution, and subsequently into a gel.…”

Section: Introductionmentioning

confidence: 99%

Preparation of P2O5-SiO2 hollow microspheres in the presence of phosphoric acid

Xie

Hua

et al. 2011

Front. Chem. Sci. Eng.

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“…In particular, the presence of a high specific surface area (SSA) is greatly demanded to accelerate surface reactions due to enhanced interfacial contact area between the substrate and the active phase (gas or liquid phase), i.e. roughly speaking; the higher the SSA is, the higher the reactivity of the material 3 …”

Section: Introductionmentioning

confidence: 99%

Growth of One‐Dimensional Nanostructures in Porous Polymer‐Derived Ceramics by Catalyst‐Assisted Pyrolysis. Part II: Cobalt Catalyst

Vakifahmetoğlu

Colombo

Carturan

et al. 2010

Journal of the American Ceramic Society

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Via catalyst-assisted pyrolysis, Si3N4 and SiC nanowires were produced on the cell walls of polymer-derived ceramic foams. The pyrolysis atmosphere and temperature were the main parameters affecting their development: silicon nitride singlecrystal nanowires formed under nitrogen, while silicon carbide ones were produced under argon, and their amount increased with the increasing pyrolysis temperature. Brunauer–Emmett– Teller analysis showed that the presence of the nanowires afforded high specific surface area (SSA) values to the macroporous ceramic foams, ranging from 10 to 110 m2/g. Co-containing samples developed higher SSA values, especially after pyrolysis at 14001C in N2, than samples containing Fe as a catalyst. The differences were explained in terms of morphology (diameter and assemblage), which depended on the processing conditions and the catalyst type (Co or Fe)

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“…Moreover, in the obtained FTIR spectrum, we can observe that the intensity of the band centered at 942 cm -1 , assigned from some authors, to Si-O-Ca vibration mode [64], slightly increases after soaking the CPS/W ceramics in TRIS-HCl buffer. The increasing intensity of this absorption band could be assigned to the presence of chemisorbed Ca 2+ (realized to the media from CPS/W ceramic) during the soaking time (3 days) with rehydrated silica surface (Si-OH groups) of the sample.…”

Section: Dissolution Test In Tris-hcl Buffermentioning

confidence: 72%

Organic/Inorganic bioactive materials Part II: in vitro bioactivity of Collagen-Calcium Phosphate Silicate/Wollastonite hybrids

et al. 2009

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Abstract:In the present study, novel hybrid materials of Collagen (C) and Calcium Phosphate Silicate/Wollastonite (CPS/W) were synthesized.The CPS/W ceramic was prepared via polystep sol-gel method. The dissolution test of CPS/W ceramic was filled with TRIS-HCl buffer. FTIR depicts that hydroxyl carbonate apatite (OHCO 3 HA) was observed after 3 days of immersion in TRIS-HCl buffer. Biohybrids of C-CPS/W were produced from diluted hydrochloric acid collagen type I and ceramic powder with different ratios of C and CPS/W equal to 25:75 and 75:25 wt.%. The synthesized hybrids were characterized by FTIR, XRD and SEM. FTIR depicts a "red shift" if amide I could be attributed to the fact that the collagen prefers to chelate Ca 2+ from partial dissolution of CPS/W ceramic. The growth of B-type carbonate containing hydroxyapatite (B-CO 3 HA) on the C-CPS/W hybrids soaked in 1.5SBF was observed. The negatively charged carboxylate groups from the collagen may be responsible for hydroxyapatite (HA) deposition. This fact was confirmed by the "red shift" of carboxylate groups of collagen in FTIR spectra. The formation of HA was observed by FTIR, XRD and SEM.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Sol-Gel SiO2-CaO-P2O5 biofilm with surface engineered for medical application

Cited by 22 publications

References 25 publications

Preparation of P2O5-SiO2 hollow microspheres in the presence of phosphoric acid

Preparation of P2O5-SiO2 hollow microspheres in the presence of phosphoric acid

Growth of One‐Dimensional Nanostructures in Porous Polymer‐Derived Ceramics by Catalyst‐Assisted Pyrolysis. Part II: Cobalt Catalyst

Organic/Inorganic bioactive materials Part II: in vitro bioactivity of Collagen-Calcium Phosphate Silicate/Wollastonite hybrids

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