Magnetic Field Effects on Silica Gel Evolution from Aqueous Silicate Solutions

被引：5

作者：

Sasahara, Shigeo ^{[1
,2
]}

Kaida, Keiichiro ^{[1
]}

Ozeki, Sumio ^{[1
]}

机构：

[1] Shinshu Univ, Fac Sci, Dept Chem, 3-1-1 Asahi, Matsumoto, Nagano 3908621, Japan

[2] Fuji Chem Co Ltd, 1683-1880 Nasubigawa Nakagaito, Gifu 5099132, Japan

来源：

CHEMISTRY LETTERS | 2016年 / 45卷 / 08期

关键词：

Silica gel formation; Magnetic field effect; Chemometrics; SI-29; NMR; WATER;

D O I：

10.1246/cl.160499

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Magnetic field effects on silica gel formation from aqueous silicate solutions were examined by Si-29 NMR, viscosity, and N-2 adsorption measurements. Si-29 NMR spectra were analyzed by the multivariate curve resolution to give three principal spectra, which may correspond to oligomeric species, polymeric species, and microgels. A 6 T magnetic field promoted the formation of polymeric species and the transformation of polymeric species to microgels. In addition, the magnetic field reduced the viscosity of the silicate solutions, suggesting depression of particle growth and interactions among silanol groups on particles under magnetic fields. Such magnetic field effects may relate to magnetic orientation and hydration of polymeric species and microgels.

引用

页码：895 / 897

页数：3

共 25 条

[1]

Bergna H E., 1994, The Colloid Chemistry of Silica, Vvol 234, DOI [10.1021/ba-1994-0234, DOI 10.1021/BA-1994-0234]

[2]

Bergna H.E., 2005, Colloidal Silica: Fundamentals and Applications

[3]

Brown SD, 2009, COMPREHENSIVE CHEMOMETRICS: CHEMICAL AND BIOCHEMICAL DATA ANALYSIS, VOLS 1-4, P1

[4] Combining hard- and soft-modelling to solve kinetic problems [J].

de Juan, A ;

Maeder, M ;

Martínez, M ;

Tauler, R .

CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS, 2000, 54 (02) :123-141

[5] UV-Raman and 29Si NMR Spectroscopy Investigation of the Nature of Silicate Oligomers Formed by Acid Catalyzed Hydrolysis and Polycondensation of Tetramethylorthosilicate [J].

Depla, Anouschka ;

Verheyen, Elke ;

Veyfeyken, An ;

Van Houteghem, Marc ;

Houthoofd, Kristof ;

Van Speybroeck, Veronique ;

Waroquier, Michel ;

Kirschhock, Christine E. A. ;

Martens, Johan A. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2011, 115 (22) :11077-11088

[6] 29Si NMR and UV-Raman Investigation of Initial Oligomerization Reaction Pathways in Acid-Catalyzed Silica Sol-Gel Chemistry [J].

Depla, Anouschka ;

Lesthaeghe, David ;

van Erp, Titus S. ;

Aerts, Alexander ;

Houthoofd, Kristof ;

Fan, Fengtao ;

Li, Can ;

Van Speybroeck, Veronique ;

Waroquier, Michel ;

Kirschhock, Christine E. A. ;

Martens, Johan A. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2011, 115 (09) :3562-3571

[7]

ENGELHARDT G, 1974, Z CHEM, V14, P109

[8] 29Si NMR and small-angle X-ray scattering studies of the effect of alkaline ions (Li+, Na+, and K+) in silico-alkaline sols [J].

Gaboriaud, F ;

Nonat, A ;

Chaumont, D ;

Craievich, A ;

Hanquet, B .

JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (12) :2091-2099

[9] 29Si NMR and Raman Glimpses into the Molecular Structures of Acid and Base Set Silica Gels Obtained from TEOS and Na-Silicate [J].

Halasz, Istvan ;

Kierys, Agnieszka ;

Goworek, Jacek ;

Liu, Haiming ;

Patterson, Robert E. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2011, 115 (50) :24788-24799

[10]

Her R.K., 1979, CHEM SILICA

← 1 2 3 →