Preparation and microstructure of sol-gel derived silver-doped silica

Date

2007-08-01

Author

Akkopru, Betul
Durucan, Caner

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

149
views

0
downloads

Silver-doped silica was prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS, Si(OC2H5)(4)) in the presence of a silver nitrate (AgNO3) solution by two different synthesis methods. In the first synthesis route, sol-gel mixtures were prepared using an acid catalyst. In the second synthesis route, silver-doped silica gels were formed by two-step acid/base catalysis. For the same concentration of silver dopant [AgNO3]/[TEOS] = 0.015 acid-catalyzed sol-gel formed a microporous silica with an average pore size of < 25 angstrom whereas the two-step catalyzed silica had an average pore size of 250 angstrom and exhibited a mesoporous structure when fully dried. The differences in the pore size affected the silver particle formation mechanism and post-calcination silver particle size. After calcination at 800 degrees C for 2 h the acid-catalyzed silica contained metallic silver particles size with an average particle size of 24 +/- 2 nm whereas two-step catalyzed silica with the same concentration of [AgNO3]/[TEOS] = 0.015 contained silver nanoparticles with an average size of approximately 32 +/- 2 nm. Mechanisms for silver particle formation and for silica matrix crystallization with respect to the processing route and calcination temperature are discussed.

Subject Keywords

Sol-gel, Silica glass, Silver nanoparticles, Hydrolysis, Antibacterial

URI

https://hdl.handle.net/11511/46666

Journal

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY

DOI

https://doi.org/10.1007/s10971-007-1561-7

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Preparation, characterization, and antibacterial activity of organo-sepiolite/chitosan/silver bionanocomposites TEKİN, NALAN; Şafaklı, Akif; BUDAK, FATMA; KARA, ALİ (2019-05-01) Bionanocomposites with different loadings of silver (Ag) were prepared via synthesis of Ag nanoparticles (AgNPs) using the wet chemical reduction method in the lamellar space layer of the organo-sepiolite/chitosan (O-SEP/CS). The prepared O-SEP/CS/Ag bionanocomposites were characterized using various analysis methods for their structure, morphology, and optical properties. The characteristic absorption bands from the UV-visible absorption spectrum confirmed the formation of AgNPs. The antibacterial activiti...
PURIFICATION AND CHARACTERIZATION OF HUMAN MENINGIOMA M2-TYPE PYRUVATE-KINASE MELLATI, AA; YUCEL, M; ALTINORS, N; Gündüz, Ufuk (1993-10-01) The M2-type pyruvate kinase was purified from human meningioma by ammonium sulfate precipitation, followed by ion exchange and affinity chromatography. The specific activity of the purified enzyme was 33.4 U/mg with a yield of 6.5%.
Preparation and characterization of ni-nitrilotriacetic acid bearing Poly(Methacrylic acid) coated superparamagnetic magnetite nanoparticles TURAL, Bilsen; KAYA, Murat; Özkan, Necati; Volkan, Mürvet (2008-02-01) Stable superparamagnetic magnetite (Fe3O4) nanoparticles were synthesized via co-precipitation in the presence of poly(methacrylic acid) (PMAA) in aqueous solution. The polymer coated Fe3O4 nanoparticles were characterized using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, thermal analysis, and vibrating sample magnetometry (VSM) techniques. These measurements reveal the presence of magnetite nanoparticles with a size of approximately 8 nm inside...
Preparation of lead zirconate titanate (Pb(Zr0.52Ti0.48)O-3) by homogeneous precipitation and calcination Oren, EE; Tas, AC (1998-05-06) Aqueous solutions of lead chloride (PbCl2), zirconium oxychloride (ZrOCl2.8H(2)O) and titanium tetrachloride (TiCl4), in appropriate volumetric amounts, were used as the starting materials in the synthesis of phase-pure Pb(Zr0.52Ti0.48)O-3 powders. Preparation of the phase-pure PZT powders were achieved, in the presence of urea (CH4N2O), by the chemical powder synthesis route of homogeneous precipitation.
Characterization of the polymer of a dipyrrolyl monomer by pyrolysis mass spectrometry Ertas, Merve; Hacaloğlu, Jale; Toppare, Levent Kamil (2004-08-01) In this work, characterization of a homopolymer of succinic acid bis(4-pyrrol-1-ylphenyl) ester prepared by galvonastatic polymerization was carried out by direct pyrolysis mass spectrometry. Although decomposition of the monomer yielding mainly butadionic acid and pyrrole occurred under the galvonastatic polymerization conditions, growth of the polymer through the pyrrole moieties was also achieved, yielding a ladder-type polymer film. The polypyrrole chains contained both quinoid and aromatic units as in ...

Citation Formats

B. Akkopru and C. Durucan, “Preparation and microstructure of sol-gel derived silver-doped silica,” JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, pp. 227–236, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46666.