Correlations between data of 29Si NMR and thermogravimetry for silica/monetite nanocomposites

被引：0

作者：

Fernandes, A. J. D. ^{[1
]}

Barbosa, J. H. P. ^{[1
]}

Silva, O. G. ^{[1
]}

Fonseca, M. G. ^{[1
]}

Arakaki, L. H. N. ^{[1
]}

Espinola, J. G. P. ^{[1
]}

机构：

[1] Univ Fed Paraiba, CCEN, Dept Chem, Joao Pessoa, Paraiba, Brazil

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2011年 / 106卷 / 02期

关键词：

Silica/monetite nanocomposites; Thermogravimetry; Calcium phosphate; HYDROXYAPATITE;

D O I：

10.1007/s10973-011-1503-z

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Silica/monetite nanocomposites were synthesized through controlled hydrolysis of tetraethoxysilane at concentrations of 5, 10, 15, and 20% mol/mol of calcium phosphate forming the solids named CaPSil1, CaPSil2, CaPSil3, and CaPSil4, respectively. XRD patterns showed formation of nanocomposites with a decrease in crystallinity. The NMR Si-29 spectra suggested an increase in the content of incorporated silica with reduction of Q(3) (-SiOH) signal, which contributes for mass loss, in agreement with thermogravimetry. The incorporation of silica increased the chemical stability of the precursor phosphate in an acidic medium.

引用

页码：463 / 467

页数：5

共 50 条

[1] Correlations between data of 29Si NMR and thermogravimetry for silica/monetite nanocomposites
A. J. D. Fernandes
J. H. P. Barbosa
O. G. Silva
M. G. Fonseca
L. H. N. Arakaki
J. G. P. Espínola
Journal of Thermal Analysis and Calorimetry, 2011, 106
[2] 29Si NMR Characterization of Silica Tetrahedron in the Silica Fume Simulate Hydration
Wang, Xiaojun
Wang, Xiaoyao
Zhu, Hongfei
Qian, Cheng
TESTING AND EVALUATION OF ADVANCED BUILDING MATERIALS, 2013, 539 : 1 - +
[3] 29Si NMR SPECTRA OF SILATRANES
徐广智
李二成
鲁开娟
吴冶新
吴观丽
陈星綵
A Monthly Journal of Science, 1985, (01) : 58 - 61
[4] Applications of 29Si NMR parameters
Wrackmeyer, Bernd
ANNUAL REPORTS ON NMR SPECTROSCOPY, VOL 57, 2006, 57 : 1 - 49
[5] 29Si NMR investigation of the structure of amorphous silica-alumina supports
McMillan, M., 1600, (38): : 1 - 3
[6] Characterization of Silica Gels by 29Si MAS NMR and IR Spectroscopic Measurements
Lutz, Wolfgang
Taeschner, Dirk
Kurzhals, Rolf
Heidemann, Detlef
Huebert, Cornelia
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 2009, 635 (13-14): : 2191 - 2196
[7] An NMR Crystallographic Investigation of the Relationships between the Crystal Structure and 29Si Isotropic Chemical Shift in Silica Zeolites
Dawson, Daniel M.
Moran, Robert F.
Ashbrook, Sharon E.
JOURNAL OF PHYSICAL CHEMISTRY C, 2017, 121 (28): : 15198 - 15210
[8] 29Si NMR investigations on oligosilane dendrimers
U. Herzog
C. Notheis
E. Brendler
G. Roewer
B. Thomas
Fresenius' Journal of Analytical Chemistry, 1997, 357 : 503 - 504
[9] Microstructure of silica monolayer solid acid catalysts determined by 29Si NMR spectroscopy
Naonobu Katada
Miki Niwa
Research on Chemical Intermediates, 1998, 24 : 481 - 494
[10] 29Si MAS-NMR study of the silica condensation in the synthesis of mesoporous materials
Guzmán-Castillo, ML
Pérez-Romo, P
Armendáriz-Herrera, H
Hernández-Beltrán, F
Tobón-Cervantes, A
López, C
Fripiat, J
Pérez-Pariente, J
MOLECULAR SIEVES: FROM BASIC RESEARCH TO INDUSTRIAL APPLICATIONS, PTS A AND B, 2005, 158 : 455 - 460

← 1 2 3 4 5 →