Attenuated Toatal Reflectance Fourier‐Transform Infrared Spectra of a Hydrated Sodium Soilicate Glass

Abstract

Attenuated total reflectance Fouriertransform infrared (ATR-FTIR) spectra were measured in the region from 4300 t o 400 c m -' f o r a hydrated Na,0-Si02 glass containing 35 wt% water. The Si-OH bending vibration mode was observed. It was found that the incorporated water, molecular water as well as hydroxyls, affected the Si-0 vibrations. The effect of incorporated water upon the glass structure is discussed. [

Leaching behaviour of low and high Fe-substituted chlorite clay minerals at low pH

“…Evidently in the present work, the new Si-OH stretching vibrations at~1240-1094 cm − 1 emerged as part of the evolution of chlorite bulk and interfacial structures' development. Such Si-OH vibrations have been identified with hydrous silica gels and their observation here is indicative of the formation of such subcrystalline phases (Almeida and Pantano, 1990;Farmer, 1974;Ilharco, 2001, 2004;Hino and Sato, 1971;Hunt et al, 1950;Poe et al, 1992;Uchino et al, 1989Uchino et al, , 1991Vempati et al, 1994). Quantitative XRD analysis showed the formation of~2.5 wt% amorphous phase,~2 wt.% hexahydrite and~0.2 wt.% gypsum in the low-Fe chlorite residue and 3.5 wt.% amorphous and 2.5 wt.% hexahydrite phases in high-Fe chlorite residue after 5 h leaching at pH 1 (Table 3).…”

“…Si-O stretching bands in the 1100-900 cm − 1 range correlate closely with tetrahedral speciation of chlorites (Farmer, 1974;Post and Plummer, 1972;Shirozu and Momoi, 1972;Tuddenham and Lyon, 1959). The principal T-O-Si (T= Si or Al) symmetric stretching vibrations within the TO 4 tetrahedra typical of amorphous aluminosilicate gels have observed at~1077-1094 cm − 1 (Almeida and Pantano, 1990;Ilharco, 2001, 2004;Poe et al, 1992;Uchino et al, 1989Uchino et al, , 1991Vempati et al, 1994). (4) The band at~831 cm − 1 is ascribed to the bending vibration of tetrahedral Al-O whilst the peak at~771 cm − 1 is mainly due to the interlayer (SiOAl)-OH vibration , the intensity of which was observed to increase with increasing tetrahedral Al(III) content (Farmer, 1974).…”

Microwave-assisted preparation of potato starch silicated with silicic acid

“…The total weight losses of these products, lower by about 30% than that of native starch, together with their considerable lower rates of decomposition, reflected by the slope of the TG line, would also confirm crosslinking esterification. Table 5 lists the band assignment in the FT-IR spectra of potato starch (Bellon-Maurel, Vallat, & Goffinet, 1995;Cael, Koenig, & Blackwell, 1975;Kizil, Irudayaraj, & Seetharaman, 2002;Sekkal, Dincq, Legrand, & Huvenne, 1995;Wilson, Goodfellow, & Belton, 1988) and of silicic acid (Neves, Lenza, & Vasconcelos, 2002;Uchino, Sakka, Hotta, & Iwasaki, 1989;Uchino, Sakka, & Iwasaki, 1991). The products of their reaction are spectrally characterized in Table 6.…”

Self-degradable Slag/Class F Fly Ash-Blend Cements

“…Figure 5 illustrates the resulting FT-IR spectra, ranging from 1800 to 500 cm -1 , of both the specimens and references. For the references, a typical spectrum (a) of sodium silicate had the following absorption bands: According to literatures [9][10][11][12] at 592 cm -1 representing sodium silicate, did not see in this spectrum. As a result, seemingly, the amorphous reaction product is likely to be the polymeric zeolite in terms of geopolymer.…”