scholarly journals SYNTHESIS OF MESOPOROUS TITANIA BY POTATO STARCH TEMPLATED SOL-GEL REACTIONS AND ITS CHARACTERIZATION

2010 ◽  
Vol 10 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Canggih Setya Budi ◽  
Indriana Kartini ◽  
Bambang Rusdiarso
Keyword(s):  
Water Solution ◽  
Potato Starch ◽  
Sol Gel ◽  
Building Blocks ◽  
Mesoporous Tio2 ◽  
Mesoporous Titania ◽  
Tio2 Powder ◽  
Nanocrystalline Tio2 ◽  
Template Removal ◽  
Starch Gel

Mesoporous titania powders with high-order crystalline building blocks had been synthesized through the sol-gel process using potato starch gel template. Internal spongelike pore structure of starch gel template was generated by heating the starch granules at 95 °C in water solution and freezing the starch gel at -15 °C. The synthesis routes were performed by immersing the starch gel template for 4 days into the white colloidal solution of TiO2 nanoparticles, which were prepared by hydrolyzing titanium (IV) tetraisopropoxide (TTIP) in ethanol at pH 1. Mesoporous TiO2 powders were obtained by two different ways of template removal, performed by calcination of the TiO2-starch composites at 600 °C for 4 h or combination of extraction with ethanol-HCl (2:1) at 80 °C and calcination at 500 °C for 4 h. Fourier Transform Infra Red (FT-IR) spectra shows both of template removal methods result in decreasing of characteristic vibrational band of the starch hydrocarbon on the resulted TiO2 powders. The X-Ray Diffraction (XRD) pattern imply that the concentrations of starch gel template influence the anatase crystallite peaks intensity of the synthesized TiO2 powders. TiO2 templated by 20% of starch sponges gel has highest intensity of anatase crystallite. Scherrer calculation inidicated that anatase particle size has nanoscale dimmension up to 12.96 nm. The nano-architecture feature of mesoporous TiO2 scaffolds was also evaluated by the Scanning Electron Microscope (SEM). It is shown that mesoporous TiO2 framework consist of nanocrystalline TiO2 particles as buiding blocks. The N2 adsorption-desorption isotherm curves assign that TiO2 powder resulted from extraction-calcination route has higher mesoporosity than that of only calcinated. The synthesized mesoporous TiO2 powder exhibits high Brunauer-Emmet-Teller (BET) specific surface area up to 65.65 m2/g.   Keywords: mesoporous TiO2, potato starch, template

Antibacterial Activity of TiO2 and Fe3+ Doped TiO2 Nanoparticles Synthesized at Low Temperature

2011 ◽  
Vol 214 ◽  
pp. 197-201 ◽  
Author(s):  
Saowaluk Boonyod ◽  
Weerawan Sutthisripok ◽  
Lek Sikong
Keyword(s):  
Antibacterial Activity ◽  
Low Temperature ◽  
Anatase Phase ◽  
Sol Gel ◽  
Fluorescent Light ◽  
Oh Radicals ◽  
Tio2 Powder ◽  
Nanocrystalline Tio2 ◽  
E Coli ◽  
Degussa P25

Nanocrystalline TiO2 powder with and without Fe3+ doping were successfully synthesized at low temperature by a microwave-assisted sol–gel method. The synthesized TiO2 powders were characterized by XRD, BET, FT-IR and SEM. It was found that anatase phase was formed after refluxed at 80°C using a domestic microwave oven. Antibacterial behavior towards E. coli was then studied under UV and fluorescent irradiation. The synthesized pure TiO2 powder exhibited superior antibacterial activity under fluorescent irradiation compared to the commercial TiO2 (Degussa P25). It can efficiently destroy E. coli bacteria after 20 min with UV irradiation and 3 h with fluorescent light; this good activity is mainly related to the high OH radicals on its surface. It was also observed that the synthesized powders have smaller crystallite size and larger specific surface area than those of Degussa P25 due to the absence of high temperature calcination requirement.

Thermal Conductivity of Amorphous and Crystalline Mesoporous Titania Thin Films From 30 to 320 K

2011 ◽  
Author(s):  
Jin Fang ◽  
Laurent Pilon ◽  
Christian Reitz ◽  
Torsten Brezesinski ◽  
E. Joseph Nemanick ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Phonon Scattering ◽  
Sol Gel ◽  
Mesoporous Tio2 ◽  
Mesoporous Titania ◽  
Tio2 Films ◽  
Mesoporous Films ◽  
Mesoporous Tio2 Films ◽  
Increasing Temperature

This paper reports, for the first time, the cross-plane thermal conductivity of amorphous and crystalline templated cubic mesoporous titania thin films from 30 to 320 K. Both sol-gel and nanocrystal-based films were synthesized by evaporation-induced self-assembly with porosity of 30% to 35%, respectively. The pore diameter in sol-gel mesoporous films ranged from 14 to 25 nm and film thickness from 120 to 370 nm. Crystalline domains in crystalline mesoporous films were 9 to 13 nm in diameter. The thermal conductivity was measured between 30 and 320 K using the 3ω method. The experimental setup and the associated analysis were first validated by comparing experimental measurements with data reported in the literature for high purity silicon substrate and thermal oxide films over the temperature range considered. The thermal conductivity of sol-gel dense and mesoporous TiO2 films was found to increase with increasing temperature. The thermal conductivity of polycrystalline dense film was strongly dependent on temperature while that of dense amorphous and mesoporous films increased slowly with increasing temperature. The amorphous mesoporous TiO2 films featured very small thermal conductivity due to the fact that heat was mainly transferred by very localized non-propagating vibrational modes. Despite the particles crystallinity, the nanocrystal-based film showed significantly lower thermal conductivity than that of the sol-gel polycrystalline mesoporous thin films due to the strong phonon scattering at the nanocrystal boundaries.

scholarly journals Thermal Conductivity of Ordered Mesoporous Titania Films Made from Nanocrystalline Building Blocks and Sol−Gel Reagents

2010 ◽  
Vol 114 (29) ◽  
pp. 12451-12458 ◽  
Author(s):  
Thomas Coquil ◽  
Christian Reitz ◽  
Torsten Brezesinski ◽  
E. Joseph Nemanick ◽  
Sarah H. Tolbert ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Sol Gel ◽  
Building Blocks ◽  
Mesoporous Titania ◽  
Ordered Mesoporous ◽  
Titania Films

STRUCTURAL, OPTICAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF NANOCRYSTALLINE TiO2 THIN FILMS DEPOSITED BY SOL-GEL SPIN COATING

2019 ◽  
Vol 7 (1) ◽  
pp. 28
Author(s):  
KOMARAIAH DURGAM ◽  
RADHA EPPA ◽  
REDDY M. V. RAMANA ◽  
KUMAR J. SIVA ◽  
R. SAYANNA ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Photocatalytic Activity ◽  
Spin Coating ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Nanocrystalline Tio2

scholarly journals Tailoring Mesoporous Titania Features by Ultrasound-Assisted Sol-Gel Technique: Effect of Surfactant/Titania Precursor Weight Ratio

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1263
Author(s):  
Elvira Mahu ◽  
Cristina Giorgiana Coromelci ◽  
Doina Lutic ◽  
Iuliean Vasile Asaftei ◽  
Liviu Sacarescu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Weight Ratio ◽  
Soft Template ◽  
Synthesis Process ◽  
Mesoporous Titania ◽  
Cavitation Effect ◽  
Titania Precursor ◽  
Gel Technique ◽  
Ultrasound Assisted

A mesoporous titania structure has been prepared using the ultrasound-assisted sol-gel technique in order to find out a way to tailor its structure. The TiO2 obtained was compared to the same version of titania but synthesized by a conventional sol-gel method with the objective of understanding the effect of ultrasound in the synthesis process. All synthesis experiments were focused on the preparation of a titania photocatalyst. Thus, the anatase photocatalytic active phase of titania was proven by X-ray diffraction. Additionally, the ultrasonation treatment proved to increase the crystallinity of titania samples, being one of the requirements to having good photocatalytic activity for titania. The influence of surfactant/titania precursor weight ratio on the structural (XRD), textural (N2-sorption measurements), morphological (TEM), surface chemistry (FTIR) and optical properties (UVDR) was investigated. It was observed that the crystallite size, specific surface area, band gap energy and even photocatalytic activity was affected by the synergism occurring between cavitation effect and the surfactant/titania precursor weight ratio. The study yielded interesting great results that could be considered for further application of ultrasound to tailor mesoporous titania features via sol-gel soft template synthesis, against conventional sol-gel process.

Ethers as Oxygen Donor and Carbon Source in Non-hydrolytic Sol-Gel: One-Pot, Atom-Economic Synthesis of Mesoporous TiO2 -Carbon Nanocomposites

2018 ◽  
Vol 24 (19) ◽  
pp. 4982-4990 ◽  
Author(s):  
Angel Manuel Escamilla-Pérez ◽  
Nicolas Louvain ◽  
Bruno Boury ◽  
Nicolas Brun ◽  
P. Hubert Mutin
Keyword(s):  
Carbon Source ◽  
Sol Gel ◽  
Mesoporous Tio2 ◽  
One Pot ◽  
Carbon Nanocomposites ◽  
Oxygen Donor

High-Speed Synthesis and Electric Properties of Magnesium Doped Lead Titanate Ceramics

2007 ◽  
Vol 121-123 ◽  
pp. 149-152
Author(s):  
Liang Sheng Qiang ◽  
Dong Yan Tang ◽  
Xing Hong Zhang ◽  
L. Jin
Keyword(s):  
Lead Titanate ◽  
High Speed ◽  
Sintering Temperature ◽  
Water Solution ◽  
Sol Gel ◽  
Electric Properties ◽  
Synthesis Process ◽  
Pure Lead ◽  
Alcohol Water ◽  
Titanate Ceramics

By adding methyl alcohol/water solution with certain concentration into sol to hydrolysis directly and sintering the fresh sol directly, lead titanate(PbTiO3) ceramics doped with magnesium are prepared by using magnesium acetate as doper to prohibit the disadvantages contained in conventional sol-gel method, such as low hydrolytic rate, high sintering temperature, long preparation period. The changes of structure, microstructure, synthesis process and electric properties of modified ceramics are studied in detail. The sizes and morphology of high purely and high density magnesium doped lead titanate nanocrystals thus obtained are observed by TEM photographs and the structures and affection of sintering temperature of to lattice constant and sizes of nanocrystals are detected by XRD. Electric properties detection results show that doped lead titanate ceramics exhibite excellent dielectric, ferroelectric and pyroelectric properties compare with pure lead titanate.

scholarly journals Nano-sized blue spectral shift in sol–gel derived mesoporous titania films

2011 ◽  
Vol 61 (2) ◽  
pp. 355-361 ◽  
Author(s):  
P. Karasiński ◽  
E. Gondek ◽  
S. Drewniak ◽  
I. V. Kityk
Keyword(s):  
Sol Gel ◽  
Spectral Shift ◽  
Mesoporous Titania ◽  
Titania Films

scholarly journals Choline chloride–zinc chloride ionic liquid as a green template for the sol–gel synthesis of mesoporous titania

RSC Advances ◽  
2017 ◽  
Vol 7 (17) ◽  
pp. 10081-10091 ◽  
Author(s):  
T. Preethi ◽  
M. P. Padmapriya ◽  
B. Abarna ◽  
G. R. Rajarajeswari
Keyword(s):  
Ionic Liquid ◽  
Zinc Chloride ◽  
Choline Chloride ◽  
Sol Gel ◽  
Mesoporous Titania ◽  
Anatase Titania ◽  
Sol Gel Synthesis

Choline chloride–zinc chloride ionic liquid has been used as a green template to synthesis highly crystalline mesoporou anatase titania.

Determination of subfreezing temperature and gel retrogradation characteristics of potato starch gel

LWT ◽  
2021 ◽  
pp. 112037
Author(s):  
Jikai Jiang ◽  
Haiyan Gao ◽  
Jie Zeng ◽  
Lin Zhang ◽  
Fang Wang ◽  
...  
Keyword(s):  
Potato Starch ◽  
Starch Gel
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