Characteristics of Titania Nanoparticles Synthesized Through Low Temperature Aerosol Process

Ani, John K.; Savithri, S.; Surender, G. D.

doi:10.4209/aaqr.2005.06.0001

Cited by 15 publications

(9 citation statements)

References 25 publications

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“…Spherical TiO nanoparticles produced by chemical techniques with titanium tetraisopropoxide (TTIP) have been obtained with diameters below 100 nm with characteristics depending on the precursor and on the type of synthesis [5][6][7][8][9]. The main precursors of TiO nanoparticles in chemical syntheses up to now have been TTIP [10,11] and TiCl 4 [12,13].…”

Section: Introductionmentioning

confidence: 99%

Chemical Structure of TiO Organometallic Particles Obtained by Plasma

Olayo¹,

González-Salgado²,

Cruz³

et al. 2013

ANP

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This work presents a study about the chemical structure of titanium oxide (TiO) particles synthesized by plasmas using titanium tetrapropoxide, Ti(-O-CH 2 -CH 2 -CH 3 ) 4 . In plasmas, practically all chemical bonds are susceptible to participate in the reactions producing different results than those obtained by the traditional chemical routes. The particles obtained this way are semispheres and fibers grouped in random and layered structures in the 120 -500 nm interval and mean diameter of 86.4 nm (fibers) and 308.6 nm (semispheres). The analysis of the resulting TiO structure was performed by IR and XPS finding that the main chemical state of Ti in these conditions was O 2 -Ti-O 2 (Ti surrounded by O) which is part of the precursor structure, however, in O, the main chemical state was Ti-O-Ti formed with the rupture of the precursor Ti-O-C bonds. These last bonds reduce the conjugation between the structure of both elements, O 2 -Ti-O 2 and Ti-O-Ti, to produce organometallic compounds. Other chemical states appeared showing consecutive dehydrogenation steps during the synthesis with the formation of multiple bonds as a consequence of the continuous collisions in the plasma. These results allow us to follow the chemical reactions promoted by this kind of plasmas to produce TiO nanoparticles which are essentially conformed of intensive dehydrogenation.

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Section: Introductionmentioning

confidence: 99%

Chemical Structure of TiO Organometallic Particles Obtained by Plasma

Olayo¹,

González-Salgado²,

Cruz³

et al. 2013

ANP

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“…Various polar and nonpolar solvents have been used in these processes, which generally require high calcination temperatures (above 450°C) to form a regular crystalline structure (anatase). However, treatment with high temperatures can reduce the surface area and cause loss of some hydroxyl groups, or alkoxides of the surface of TiO 2 , which therefore acquire undesired characteristics such as easy-dispersing reactor corrosion and operating problems at high temperatures, thus being unsuitable for large scale production [3,8,158]. Therefore, to obtain TiO 2 particles with all their properties unchanged, low temperature methods must be applied.…”

Section: Preparation Of Titanium Nanoparticles (Anatase) By Sol-gelmentioning

confidence: 99%

“…This nanomaterial can be used as a pigment powder or in photocatalytic applications, as a colloid, photovoltaic thin films, electrochromic and photochromic, electroluminescence device and sensor component for antireflection coatings on porous membranes for ultrafiltration or even refractory fiber [8,16].…”

Section: Preparation Of Titanium Nanoparticles (Anatase) By Sol-gelmentioning

confidence: 99%

Enzyme Immobilization by Amperometric Biosensors with TiO2 Nanoparticles Used to Detect Phenol Compounds

et al. 2015

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Nanoparticles of titanium dioxide (TiO 2 ) have unique properties in creating an appropriate microenvironment for immobilizing biomolecules without loss of biological activity, and facilitating electron transference between the enzyme and surface of the electrode. TiO 2 properties have led to its intensive use in building electrochemical biosensors. Another aspect is, the chemical process of sol-gel which offers new and interesting advantages in the encapsulation of biomolecules sensitive to heat and environmental conditions (enzymes, proteins, antibodies, and cells from plants, animals and micro-organisms), mainly due to a synthesized process at low temperatures. The nanomaterials produced by sol-gel have many advantages, including chemical inertia, physical rigidity, insignificant swelling in an aqueous medium, and porosity. For this reason, electrochemical biosensors consisting of nanomaterials have been extensively investigated and used in important industrial sectors, such as, those of pharmaceuticals, health, food, agriculture, and environment. They provide real-time data, which allows the control and traceability of each of the processes involved. Biosensors are devices that consist of one element of molecular recognition (biomolecules) and one transduction element. The objective of this work is to conduct a review of electrochemical biosensors using nanoparticles obtained from the sol-gel process and their potential application to measure phenol compounds.

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“…Titanium oxides (TiOx) have been used in photo‐catalytic and ‐conductive applications because of their high electromagnetic sensitivity in the ultraviolet (UV) interval, 200–350 nm . One of the TiOx precursors is titanium tetra isopropoxide (TTIP) (Ti‐(O‐CH‐(CH 3 ) 2 ) 4 ) which has isopropyl groups (i‐Pr) attached to the oxygen atoms in the molecule.…”

Section: Introductionmentioning

confidence: 99%

“…Titanium oxides (TiOx) have been used in photo-catalytic and -conductive applications because of their high electromagnetic sensitivity in the ultraviolet (UV) interval, 200-350 nm. [1][2][3][4] One of the TiOx precursors is titanium tetra isopropoxide (TTIP) (Ti-(O-CH-(CH 3 ) 2 ) 4 ) which has isopropyl groups (i-Pr) attached to the oxygen atoms in the molecule. Under the constant collisions of particles accelerated by electric fields with these molecules, many of their chemical bonds may break producing dehydrogenation and fragmentation forming two types of structures in the same material, one inorganic phase based on TiOx and another organic phase based on carbon combinations resulted from i-Pr segments.…”

Section: Introductionmentioning

confidence: 99%

Carbonization, Hydrogenation, Oxidation and Electromagnetic Absorption of TiOx‐Pyrrole Compounds

González-Salgado

Olayo

García-Rosales

et al. 2017

Macromolecular Symposia

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This work presents a morphologic, structural and electromagnetic absorption study in plasma‐synthesized organometallic hybrid compounds based on titanium oxide and pyrrole, which could potentially be used as photoconductive materials in solar cells. The synthesis was carried out with the combination in liquid phase of titanium tetra isopropoxide and pyrrole with 1:1 mass ratio in a glass vacuum tubular reactor with resistive electric discharges and reaction intervals from 60 to 240 min. Films and particles were formed with mean particle diameter of 438 nm. The hybrid compounds presented functional groups with multiple bonds related with pyrrole and TiOx structures. Organic and inorganic phases were detected in the hybrid matrices in which carbonization, hydrogenation, oxidation and nitridation were quantified which suggested strong dehydrogenation and the formation of multiple bonds in the plasma reactions. The compounds absorbed electromagnetic radiation in two regions with different intensity. The first and most intense one was between 190 and 350 nm wavelength, the second one was identified from 350 to 800 nm, this effect suggests that the titanium oxide is the dominant fraction in the first region and pyrrole in the second.

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Characteristics of Titania Nanoparticles Synthesized Through Low Temperature Aerosol Process

Cited by 15 publications

References 25 publications

Chemical Structure of TiO Organometallic Particles Obtained by Plasma

Chemical Structure of TiO Organometallic Particles Obtained by Plasma

Enzyme Immobilization by Amperometric Biosensors with TiO2 Nanoparticles Used to Detect Phenol Compounds

Carbonization, Hydrogenation, Oxidation and Electromagnetic Absorption of TiOx‐Pyrrole Compounds

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