1975
DOI: 10.1002/zaac.19754180103
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29Si‐NMR‐Spektroskopie an Silicatlösungen. II. Zur Abhängigkeit der Struktur der Silicatanionen in wäßrigen Natriumsilicatlösungen vom Na : Si‐Verhältnis

Abstract: Die 29Si‐FT‐NMR‐Spektren von 13 Natriumsilicatlösungen mit unterschiedlichem Na:Si‐Verhältnis werden in Hinblick auf die Struktur der in den Lösungen auftretenden Silicatanionen untersucht. Für die 5 möglichen Baugruppen (Monosilicat, Endgruppen. Mittelgruppen, Verzweigungs‐ und Vernetzungsgruppen) lassen sich definierte Bereiche der 29Si‐chemischen Verschiebung angeben, in denen durch Einfluß der weiteren strukturellen Umgebung i. a. zahlreiche Signalaufspaltungen beobachtet werden. Aus den relativen Intensit… Show more

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Cited by 196 publications
(65 citation statements)
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“…These bands correspond to symmetric siliconoxygen stretching vibrations of silicate tetrahedral units, respectively with four, three, two and one non-bridging oxygen atoms (McMillan 1984). These units are usually termed as the Q 0 , Q 1 , Q 2 and Q 3 species (Matson et al 1983); the notation is borrowed from NMR spectroscopic studies (Engelhardt et al 1975). The Q 0 , Q 1 , Q 2 and Q 3 units appear in the Raman spectrum of alkaline silicate glasses in the ∼850, ∼900, 950-1000 and 1100-1150 cm −1 positions, respectively (McMillan 1984).…”
Section: Bulk and Porous Silica Glassmentioning
confidence: 99%
“…These bands correspond to symmetric siliconoxygen stretching vibrations of silicate tetrahedral units, respectively with four, three, two and one non-bridging oxygen atoms (McMillan 1984). These units are usually termed as the Q 0 , Q 1 , Q 2 and Q 3 species (Matson et al 1983); the notation is borrowed from NMR spectroscopic studies (Engelhardt et al 1975). The Q 0 , Q 1 , Q 2 and Q 3 units appear in the Raman spectrum of alkaline silicate glasses in the ∼850, ∼900, 950-1000 and 1100-1150 cm −1 positions, respectively (McMillan 1984).…”
Section: Bulk and Porous Silica Glassmentioning
confidence: 99%
“…The structure of sodium silicate solutions at pH > 11 has previously been studied for different concentrations, pH and SiO 2 :Na 2 O ratios [1,2,6,[11][12][13][14][15][16]. In general, there seems to be a structural change in the sodium silicate solutions in the region where the SiO 2 :Na 2 O ratio is 2.0-2.5.…”
Section: Introductionmentioning
confidence: 96%
“…The silicon atoms are denoted by Mn ( n = 0 , l ) and Q" ( n = 0, 1, 2, 3,4). This nomenclature was introduced by Engelhardt et al (6). The chemical shifts of resonance peaks in the 29Si NMR spectra of aqueous-methanol or aqueoussodium hydroxide silicate solutions are presented in Table I.…”
Section: Resultsmentioning
confidence: 99%