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Statements

Subject Item
n2:RIV%2F61388980%3A_____%2F14%3A00429195%21RIV15-GA0-61388980
rdf:type
n12:Vysledek skos:Concept
dcterms:description
The influence of added sucrose on the phase composition of iron oxide nanoparticles was studied in the Fe2O3/SiO2 nanocomposites. The nanocomposites were prepared by impregnation of mesoporous silica SBA-15 with iron nitrate containing various amounts of sucrose and their subsequent annealing at 1100 and 1200 degrees C. The phase composition of the iron oxide nanoparticles in the prepared nanocomposites was analyzed by X-ray diffraction and Fe-57 Mossbauer spectroscopy on polycrystalline samples. Profile analysis of the X-ray diffraction maxima was used to determine the apparent crystallite size of the different polymorphs. The content of beta-Fe2O3 in the samples increased with an increasing amount of sucrose, and no beta-Fe2O3 was observed in the samples without sucrose. These samples contained only epsilon-Fe2O3 and hematite. The apparent crystallite size was found to be similar for both hematite and beta-Fe2O3. Therefore, sucrose was identified as the primary variable, which directs the epsilon-Fe2O3 transformation to either hematite or beta-Fe2O3. Our findings shift the way we understand the beta-Fe2O3 formation from epsilon-Fe2O3 in the Fe2O3/SiO2 system from the size-directed to the starting material-directed transformation. The influence of added sucrose on the phase composition of iron oxide nanoparticles was studied in the Fe2O3/SiO2 nanocomposites. The nanocomposites were prepared by impregnation of mesoporous silica SBA-15 with iron nitrate containing various amounts of sucrose and their subsequent annealing at 1100 and 1200 degrees C. The phase composition of the iron oxide nanoparticles in the prepared nanocomposites was analyzed by X-ray diffraction and Fe-57 Mossbauer spectroscopy on polycrystalline samples. Profile analysis of the X-ray diffraction maxima was used to determine the apparent crystallite size of the different polymorphs. The content of beta-Fe2O3 in the samples increased with an increasing amount of sucrose, and no beta-Fe2O3 was observed in the samples without sucrose. These samples contained only epsilon-Fe2O3 and hematite. The apparent crystallite size was found to be similar for both hematite and beta-Fe2O3. Therefore, sucrose was identified as the primary variable, which directs the epsilon-Fe2O3 transformation to either hematite or beta-Fe2O3. Our findings shift the way we understand the beta-Fe2O3 formation from epsilon-Fe2O3 in the Fe2O3/SiO2 system from the size-directed to the starting material-directed transformation.
dcterms:title
alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System
skos:prefLabel
alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System alpha-Fe2O3 versus beta-Fe2O3: Controlling the Phase of the Transformation Product of epsilon-Fe2O3 in the Fe2O3/SiO2 System
skos:notation
RIV/61388980:_____/14:00429195!RIV15-GA0-61388980
n3:aktivita
n14:P n14:I
n3:aktivity
I, P(GAP204/10/0035)
n3:cisloPeriodika
3
n3:dodaniDat
n15:2015
n3:domaciTvurceVysledku
n17:4725328 n17:7933665
n3:druhVysledku
n11:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n6:predkladatel
n3:idSjednocenehoVysledku
2234
n3:idVysledku
RIV/61388980:_____/14:00429195
n3:jazykVysledku
n4:eng
n3:klicovaSlova
CHEMICAL-VAPOR-DEPOSITION; OXIDE THIN-FILMS; X-RAY; GAMMA-FE2O3 NANOPARTICLES; THERMAL-DECOMPOSITION
n3:klicoveSlovo
n9:THERMAL-DECOMPOSITION n9:OXIDE%20THIN-FILMS n9:GAMMA-FE2O3%20NANOPARTICLES n9:CHEMICAL-VAPOR-DEPOSITION n9:X-RAY
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[8647CBCE642A]
n3:nazevZdroje
Crystal Growth & Design
n3:obor
n13:CA
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:projekt
n18:GAP204%2F10%2F0035
n3:rokUplatneniVysledku
n15:2014
n3:svazekPeriodika
14
n3:tvurceVysledku
Bezdička, Petr Kohout, J. Brázda, Petr Kmjec, T.
n3:wos
000332684400019
s:issn
1528-7483
s:numberOfPages
8
n7:doi
10.1021/cg4015114