Complexation of Zr(IV) Precursors in Aqueous Solutions

1992 ◽  
Vol 271 ◽  
Author(s):  
J. Livage ◽  
M. Chatry ◽  
M. Henry ◽  
F. Taulelle
Keyword(s):  
Aqueous Solutions ◽  
Sol Gel ◽  
Chemical Species ◽  
Ionic Species ◽  
Whole Process ◽  
Charge Model ◽  
Partial Charge Model ◽  
Sol Gel Synthesis ◽  
Inorganic Precursors

ABSTRACTThe sol-gel synthesis of metal oxides can be performed via the hydroxylation and condensation of metal cations in aqueous solutions. The complexation of these ionic species by anions leads to the chemical modification of inorganic precursors at a molecular level. The whole process of hydrolysis and condensation can then be modified allowing a chemical control of the morphology, the structure and even the chemical composition of the resulting powder.The role of anions during the formation of condensed phases from inorganic precursors in aqueous solutions has to be taken into account. The complexing ability of these anions is described in the frame of the Partial Charge Model as a function of pH and the mean electronegativity of anionie and cationic chemical species. Experimental evidence for the complexation of zirconyl species in aqueous solutions will be given using multinuclear NMR of anions.

scholarly journals Role of annealing temperature on the sol–gel synthesis of VO2 nanowires with in situ characterization of their metal–insulator transition

RSC Advances ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 5158-5165 ◽  
Author(s):  
Y.-R. Jo ◽  
S.-H. Myeong ◽  
B.-J. Kim
Keyword(s):  
Sol Gel ◽  
Insulator Transition ◽  
In Situ Characterization ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Nanowire Device ◽  
Sol Gel Synthesis

The single-VO2 nanowire device synthesized via sequential morphological evolutions with oxygen reduction during annealing features a sharp metal-insulator transition.

scholarly journals Correction: Role of annealing temperature on the sol–gel synthesis of VO2 nanowires with in situ characterization of their metal–insulator transition

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 31984-31984
Author(s):  
Y.-R. Jo ◽  
S.-H. Myeong ◽  
B.-J. Kim
Keyword(s):  
Annealing Temperature ◽  
Sol Gel ◽  
Insulator Transition ◽  
In Situ Characterization ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Sol Gel Synthesis

Correction for ‘Role of annealing temperature on the sol–gel synthesis of VO2 nanowires with in situ characterization of their metal–insulator transition’ by Y.-R. Jo et al., RSC Adv., 2018, 8, 5158–5165.

scholarly journals The role of the ionic liquid C6C1ImTFSI in the sol–gel synthesis of silica studied using in situ SAXS and Raman spectroscopy

2015 ◽  
Vol 17 (15) ◽  
pp. 9841-9848 ◽  
Author(s):  
Moheb Nayeri ◽  
Kim Nygård ◽  
Maths Karlsson ◽  
Manuel Maréchal ◽  
Manfred Burghammer ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Ionic Liquid ◽  
Sol Gel ◽  
Chemical Changes ◽  
X Ray ◽  
X Ray Scattering ◽  
Sol Gel Synthesis ◽  
Ray Scattering

Structural and chemical changes during the sol–gel synthesis of silica using an ionic liquid are investigatedin situand simultaneously by X-ray scattering and μ-Raman spectroscopy.

Role of PEG4000 in sol-gel synthesis of Sm2Ti2O7 photocatalyst for enhanced activity

2017 ◽  
Vol 704 ◽  
pp. 26-31 ◽  
Author(s):  
Wenjie Zhang ◽  
Zheng Ma ◽  
Ling Du ◽  
Hong Li
Keyword(s):  
Sol Gel ◽  
Enhanced Activity ◽  
Sol Gel Synthesis

Electronegativity-Based Computation of 29Si Chemical Shifts

1992 ◽  
Vol 271 ◽  
Author(s):  
Henry. M ◽  
Gerardin. C ◽  
Taulelle. F
Keyword(s):  
Chemical Shifts ◽  
Sol Gel ◽  
Partial Charge ◽  
Detailed Structure ◽  
Mean Excitation Energy ◽  
Charge Model ◽  
Partial Charges ◽  
Nuclear Shielding ◽  
Partial Charge Model ◽  
The Mean

ABSTRACTThe Partial Charge Model has been modified to take into account the detailed structure of any molecular sol-gel precursors or inorganic solid networks. Starting from these structure-dependent partial charges, the classical theory of nuclear shielding is applied to compute the electronic cloud compacity <r-3>p, the population unbalance Pu and also the mean excitation energy ΔE. With these three parameters it is possible to explain the chemical shifts variations, spanning from +40 down to -140 ppm, of more than 50 precursors. Depending on the ligands, the well-known upside-down U-curves for series SiXnY4-n (n=0‥4) can be ascribed either to the population unbalance term Pu or to a competition between the two other terms <r-3>p and ΔE.

Dual role of the reactant MOH (M=Li, Na or K) in the growth of ZnO quantum dots under a sol–gel process: promoter and inhibitor

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 50173-50179 ◽  
Author(s):  
Song Li ◽  
Song Ye ◽  
Tianhua Liu ◽  
Zhuang Guo ◽  
Huiyun Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Sol Gel ◽  
Dual Role ◽  
Synthesis Process ◽  
Sol Gel Process ◽  
Zno Quantum Dots ◽  
Sol Gel Synthesis

ZnO quantum dots (QDs) with tunable size and photoluminescence can be achieved simply by controlling their growth during the sol–gel synthesis process.

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