The effect of temperature and LiClO4 in the water structure: a Raman spectroscopy study

Neto, Ana María Pereira; Sala, O.

doi:10.1590/s0103-97332004000100017

Cited by 5 publications

(2 citation statements)

References 9 publications

(8 reference statements)

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“…The water spectrum presents a very intense signal in the 2900 to 3700 cm -1 range, which corresponds to the stretching of the OH bond of a water molecule. 14,21,22 The phase transition of the liquid into solid water induces a collapse of the region above the 3300 cm -1 signature of the OH antisymmetric stretching vibrations and, by contrast, an intensity increase around 3200 cm -1 , corresponding to the OH symmetric stretching vibrations 23,24 (Fig. 3a).…”

Section: Preliminary Considerationsmentioning

confidence: 99%

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Spectroscopic Characterization of Urea Aqueous Solutions: Experimental Phase Diagram of the Urea–Water Binary System

et al. 2013

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Raman spectroscopy was used to analyze mixtures of urea and water in order to identify the influence of the urea concentration on the solution's freezing point. Our approach consisted in the analysis of urea aqueous solutions and the determination of their phase transitions at low temperatures. Hence, Raman spectra of these solutions were acquired in a -30 to 10 °C temperature range. This enabled us to build the experimental phase diagram of the urea-water binary system.

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Section: Preliminary Considerationsmentioning

confidence: 99%

“…The water spectrum presents a very intense signal in the 2900 to 3700 cm −1 range, which corresponds to the stretching of the OH bond of a water molecule. 14,21,22…”

Section: Preliminary Considerationsmentioning

confidence: 99%

Spectroscopic Characterization of Urea Aqueous Solutions: Experimental Phase Diagram of the Urea–Water Binary System

et al. 2013

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Comparison of Raman spectroscopic methods for the determination of supercooled and liquid water temperature

Risović¹,

Furić²

2005

J Raman Spectroscopy

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Raman spectroscopy provides an efficient method for non-contact determination of liquid water temperature with high spatial resolution. It can be also used for remote in situ determination of subsurface water temperature. The method is based on temperature-dependent changes of the molecular O-H stretching band in the Raman spectra of liquid water. These in turn are attributed to a decrease in intermolecular hydrogen-bonding interactions with increase in temperature. Here, the results of an experimental study employing three different approaches in the determination of temperature from recorded O-H stretching band in the Raman spectra of liquid and supercooled water are presented and discussed. The first two methods are based on deconvolution of the spectral band into Gaussian components whose intensities and associated specific spectral markers are temperature dependent, and the third approach is based on Raman difference spectroscopy (RDS). The presented measurements were conducted on distilled and deionized supercooled and liquid water in the temperature range between −12.5 and +32.5• C. The results are compared in terms of linearity of response, sensitivity and accuracy. It is shown that the method based on RDS even in the supercooled temperature range provides better accuracy (the standard deviation from the true temperature is ±0.4 K) and linearity in temperature determination than more complicated methods based on Gaussian deconvolution of the O-H stretching band.

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SVD‐based method for intensity normalization, background correction and solvent subtraction in Raman spectroscopy exploiting the properties of water stretching vibrations

Palacký

Mojzeš

Bok

2011

J Raman Spectroscopy

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A semiautomated method combining intensity normalization with effective elimination of the solvent signal and non-Raman background is presented for Raman spectra of biochemical and biological analytes in aqueous solutions. The method is particularly suitable for rapid and effortless preprocessing of extensive datasets taken as a function of gradually varied physicochemical parameters, e.g. analyte and/or ligand concentration, temperature, pH, pressure, ionic strength, time, etc. For intensity normalization, the strong Raman OH stretching band of water in the range of 2700-3900 cm −1 recorded together with the analyte spectrum in the fingerprint region below 1800 cm −1 is employed as internal intensity standard. Concomitant dependences of the solvent Raman spectra are taken into account and, in some cases, turned into advantage. Once the Raman spectra of the solvent are acquired for a particular range of the parameter varied, solvent contribution can be subtracted correctly from any analyte spectrum taken within this range. The procedure presented can be efficiently applied only for the analytes having their own Raman signal in the range of OH stretching vibrations much weaker than that of the solvent. However, this is the case for a great number of biochemical and biological samples. Accuracy, reliability and robustness of the method were tested under the conditions of spontaneous Raman, resonance Raman and surface-enhanced Raman scattering. Serviceability of the method is demonstrated by several real-world examples.

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The effect of temperature and LiClO4 in the water structure: a Raman spectroscopy study

Cited by 5 publications

References 9 publications

Spectroscopic Characterization of Urea Aqueous Solutions: Experimental Phase Diagram of the Urea–Water Binary System

Spectroscopic Characterization of Urea Aqueous Solutions: Experimental Phase Diagram of the Urea–Water Binary System

Comparison of Raman spectroscopic methods for the determination of supercooled and liquid water temperature

SVD‐based method for intensity normalization, background correction and solvent subtraction in Raman spectroscopy exploiting the properties of water stretching vibrations

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