FTIR spectroscopic study on liquid silica solutions and nanoscale particle size determination

Osswald, Jürgen; Fehr, Karl Thomas

doi:10.1007/s10853-006-7327-8

Cited by 94 publications

(65 citation statements)

References 22 publications

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“…Although there are a number of studies on the assignments of vibration bands of silica solids, glasses and gels [31,32], the assignments related to the distribution of anionic species in sodium silicate solution, especially very dilute solutions, are still unclear and some even incompatible [16][17][18]. To obtain the distribution of silicate species with pH and concentration, a silicate speciation model was set up using WinSGW program [33].…”

Section: Spectra Of Aqueous Sodium Silicatementioning

confidence: 99%

“…These efforts were based on potentiometric titrations as well as infrared, Raman and 29 Si NMR spectroscopy [11][12][13][14][15][16][17]. From these studies, it became clear that aqueous silicate solutions is a mixture of anions and that the distribution of various silicate species mainly depended on the SiO 2 :Na 2 O ratio, SiO 2 concentration, pH, temperature and aging.…”

Section: Introductionmentioning

confidence: 99%

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A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Yang

Roonasi

Holmgren

2008

Journal of Colloid and Interface Science

167

105

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The sorption of sodium silicate by synthetic magnetite (Fe 3 O 4 ) at different pH conditions (pH 7-11) and initial silicate concentrations (1 × 10 −3 and 10 × 10 −3 mol L −1 ) was studied using in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The analysis of infrared spectra of sodium silicate in solution as well as adsorbed on magnetite nano-particles clearly showed the evolution of different silicate species depending on pH and silica concentration. The silicate concentration studied (10 × 10 −3 mol L −1 ) contained polymeric or condensed silicate species at lower pH as well as monomers at high pH, as evident from infrared spectra. Condensation of monomers resulted in an increased intensity of absorptions in the high frequency part (>1050 cm −1 ) of the spectral region, which contains information about both silicate in solution and sorbed silicate viz. 1300 cm −1 -850 cm −1 . In the pH range studied, infrared spectra of sorbed silicate and sorbed silicate during desorption both indicated the presence of different types of surface complexes at the magnetite surface. The sorption mechanism proposed is in accordance with a ligand exchange reaction where both monodentate and bidentate complexes could exist at low surface loading level, the relative proportion of the complexes being due to both pH and concentration in solution. Oligomerization occurred on the magnetite surface at higher surface loading.

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Section: Spectra Of Aqueous Sodium Silicatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Yang

Roonasi

Holmgren

2008

Journal of Colloid and Interface Science

167

105

View full text Add to dashboard Cite

show abstract

“…In the case of silicate paint a strong and relatively broad peak centered at 1078 cm −1 is observed which has a different appearance than the absorption band of the resin paint at a similar frequency region. This band can be assigned to the asymmetric stretching of Si-O-Si [20] superimposed with the Si-O-K band vibrations originating from the silica nanoparticle suspension and the potassium silicate binder, respectively [21]. In both the paints some common features are observed that can be identified as the calcium carbonate (CaCO 3 ) extender, which shows strong absorption around 1400-1427 cm −1 (asymmetric stretching of CO 2− 3 ) and 872 cm −1 (out-of-plane bending of CO 2− 3 ) and a relatively weak peak at 712 cm −1 due to CO 2− 3 in-plane bending [22][23][24].…”

Section: Resultsmentioning

confidence: 99%

Self-Cleaning Mineral Paint for Application in Architectural Heritage

Pal

Contaldi²,

Licciulli

et al. 2016

Coatings

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A mineral silicate paint has been developed for architectural heritage. To enhance durability, any type of organic additive has been avoided. Potassium silicate was the binder agent intended to give strong adherence and durability to stone and concretes. Incorporation of mainly anatase titanium dioxide was intended to act both as a white, bright pigment and as a photocatalyst. Reflectivity analyses on the paint in the visible-to-near infrared wavelength region show high solar heat reflection. The self-cleaning activity of the mineral paint was evaluated by the degradation of organic dyes under solar light irradiation. Anatase titania was effective in decomposing organic and airborne pollutants with the solar radiation. The optical properties and self-cleaning activity were compared with the organic binder-based paints and commercial paints. Developed paints possess high stability: since they contain only inorganic components that do not fade with exposure to solar radiation, photocatalytic self-cleaning capability further enhances such stability.

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“…S3 in the ESI †). 33,40,41 The spectra were recorded using potassium bromide (KBr, p.a. for IR spectroscopy, Fluka) pellets as medium.…”

Section: Sample Preparationmentioning

confidence: 99%

Colloidal cubes for the enhanced degradation of organic dyes

et al. 2014

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The shape of cubic silica colloids is exploited to form close-packed structures, whereas the hollow core of the cubes may host functional substances. A proof-of-principle of this approach is presented for iron oxide particles (hematite, a-Fe 2 O 3 ) confined inside silica cubes that display the ability to accelerate the degradation of the organic dyes methylene blue and rhodamine B in the presence of hydrogen peroxide (modified Fenton reaction). The silica coating does not impede the reaction, since degradation rates similar to those of bare hematite particles are observed. Moreover, the cubic colloids are still functional when densely packed onto a substrate. The degradation reaction is greatly enhanced by illumination with visible or UV light: the degradation time reduces by two orders of magnitude. Although the silica coating is damaged during the degradation reaction, the stability of the coating is improved by heat treatment of the cubes and by illumination.

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FTIR spectroscopic study on liquid silica solutions and nanoscale particle size determination

Cited by 94 publications

References 22 publications

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Self-Cleaning Mineral Paint for Application in Architectural Heritage

Colloidal cubes for the enhanced degradation of organic dyes

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