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Statements

Subject Item
n2:RIV%2F61388980%3A_____%2F14%3A00429129%21RIV15-GA0-61388980
rdf:type
n9:Vysledek skos:Concept
dcterms:description
Reaction of hydrogen peroxide with suspensions of thoroughly washed precipitates obtained by neutralization of aqueous solution of titanyl sulfate with aqueous ammonia leads to transparent yellow liquids. In this way prepared colloid solution is a two phase system in which, beyond the water phase, also a liquid hydrated peroxo-polytitanic acid component is present. Freeze drying of this colloid liquid provides a foamy material consisting of thin foils of peroxo-polytitanic acid containing small but not negligible amount of chemically bound ammonia. These foams annealed at temperature above similar to 200 degrees C lose water, ammonia and excess of oxygen providing foamy amorphous oxide. At higher temperatures above similar to 280 degrees C the amorphous material crystallizes to anatase which transforms at temperatures >850 degrees C to rutile. The size and shape of the initial leaflets forming the foam is preserved up to similar to 900 degrees C. Slit shaped porosity is formed during annealing. We observed that the annealed material is highly photoactive, probably owing to highly anisotropic shape of anatase aggregates and their perfect crystallinity. Reaction of hydrogen peroxide with suspensions of thoroughly washed precipitates obtained by neutralization of aqueous solution of titanyl sulfate with aqueous ammonia leads to transparent yellow liquids. In this way prepared colloid solution is a two phase system in which, beyond the water phase, also a liquid hydrated peroxo-polytitanic acid component is present. Freeze drying of this colloid liquid provides a foamy material consisting of thin foils of peroxo-polytitanic acid containing small but not negligible amount of chemically bound ammonia. These foams annealed at temperature above similar to 200 degrees C lose water, ammonia and excess of oxygen providing foamy amorphous oxide. At higher temperatures above similar to 280 degrees C the amorphous material crystallizes to anatase which transforms at temperatures >850 degrees C to rutile. The size and shape of the initial leaflets forming the foam is preserved up to similar to 900 degrees C. Slit shaped porosity is formed during annealing. We observed that the annealed material is highly photoactive, probably owing to highly anisotropic shape of anatase aggregates and their perfect crystallinity.
dcterms:title
Highly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid Highly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid
skos:prefLabel
Highly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid Highly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid
skos:notation
RIV/61388980:_____/14:00429129!RIV15-GA0-61388980
n4:aktivita
n7:P n7:I
n4:aktivity
I, P(GA203/09/1117)
n4:cisloPeriodika
JAN
n4:dodaniDat
n11:2015
n4:domaciTvurceVysledku
n5:1246364 n5:1698508 n5:9386181 n5:6881076 n5:2445115 n5:2754541 n5:7933665
n4:druhVysledku
n10:J
n4:duvernostUdaju
n12:S
n4:entitaPredkladatele
n15:predkladatel
n4:idSjednocenehoVysledku
19145
n4:idVysledku
RIV/61388980:_____/14:00429129
n4:jazykVysledku
n16:eng
n4:klicovaSlova
Oxides; Layered compounds; Electron microscopy; Raman spectroscopy; X-ray diffraction
n4:klicoveSlovo
n8:X-ray%20diffraction n8:Layered%20compounds n8:Oxides n8:Electron%20microscopy n8:Raman%20spectroscopy
n4:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n4:kontrolniKodProRIV
[AF79DDF5EFC9]
n4:nazevZdroje
Materials Research Bulletin
n4:obor
n17:CA
n4:pocetDomacichTvurcuVysledku
7
n4:pocetTvurcuVysledku
7
n4:projekt
n18:GA203%2F09%2F1117
n4:rokUplatneniVysledku
n11:2014
n4:svazekPeriodika
49
n4:tvurceVysledku
Boháček, Jaroslav Pližingrová, Eva Bezdička, Petr Pulišová, Petra Volfová, Lenka Šubrt, Jan Kupčík, Jaroslav
n4:wos
000330081400063
s:issn
0025-5408
s:numberOfPages
8
n14:doi
10.1016/j.materresbull.2013.09.028