Molecular mobility and structure in water-acetone mixtures

Toryanik, A. I.; Taranenko, V. N.

doi:10.1007/bf00752054

Cited by 14 publications

(12 citation statements)

References 5 publications

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“…The shape of PEG-molecules in water solutions is sphere-like [15,16]. Detailed analyses performed recently [17,18] showed that the mobility of ions was influenced much more by microviscosity of ion's environment (affected by hydration of monomeric chain of polyglycols) than by macroviscosity which depends on the configuration of the polymer chain. Thus, the movement of ions in the polymer solutions was not determined by the macromolecules as distinct particles.…”

Section: Choice Of the Non-electrolytesmentioning

confidence: 99%

A simple method for the determination of the pore radius of ion channels in planar lipid bilayer membranes

Krasilnikov¹,

Sabirov

Ternovsky

et al. 1992

FEMS Microbiology Letters

185

148

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A new method of pore size determination is presented. The results of applying this simple method to ion channels formed by staphylococcal α‐toxin and its N‐terminal fragment as well as to cholera toxin channels are shown. The advantages and the difficulties of this method are discussed. It was found that (i) the mobility of ions in solutions depends only on the percentage of concentration of added non‐electrolytes and practically not on their chemical nature (sugars or polyglycols) and molecular size; (ii) the proportional change of both ion channel conductance and bulk solution conductivity by low M. non‐electrolytes may be used as an indication of a diffusion mechanism of ion transport through channels; (iii) the slope of the dependence of the ion channel conductance on the bulk conductivity of solutions containing different concentrations of non‐electrolyte is a good measure of channel permeability for non‐electrolytes.

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Section: Choice Of the Non-electrolytesmentioning

confidence: 99%

A simple method for the determination of the pore radius of ion channels in planar lipid bilayer membranes

Krasilnikov¹,

Sabirov

Ternovsky

et al. 1992

FEMS Microbiology Letters

185

148

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“…Acetone can remove water from pores that are too small for dextran to enter. At 0.63 nm, the molecular diameter of acetone is approximately 900-fold smaller (Toryanik and Taranenko 1988) than the 560-nm value reported for dextran (Stone et al 1968). In comparison, water has a diameter of 0.264 nm (Hines and Maddox 1985).…”

Section: Resultsmentioning

confidence: 67%

Characterization of thin water layers in pulp by tritium exchange. Part 1: Methods development

Walsh

Banerjee

2007

Holzforschung

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A new technique for measuring the monolayer water content of fiber is presented. Tritiated water is added to a pulp/water suspension, whereupon the tritium partitions between the bulk water and the pulp. In the pulp phase the tritium can exchange with free water, bound water, and with hydroxyl and other protons present in the pulp matrix. The free water in the pulp is then removed by displacement with acetone. The tritium remaining in the pulp is mostly associated with tightly bound water, with a small fraction being tied up with the exchangeable hydrogen in pulp. The procedure provides a value of 10% for the tightly bound water content of hardwood or softwood fiber, either bleached or unbleached. If this water is assumed to cover the fiber surface as a monolayer, then an estimate of the wet surface area of the fiber can be obtained. This estimate compares well with independent measurements of surface area.

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“…Although the polar vapors studied are not true electrolytes, they can give rise to strong H-bonding with water molecules. In the vapor mixture polar molecules like acetone can be surrounded by several water molecules depending on the faction of both, to make a stable quasi clathrate structure [69]. Therefore, the Figure 9 shows that using a set of three vQRS (one polar and two non-polar) allows to discriminate well the five pure VOC between them, the mixes between them, but that there can be some overlapping between pure VOC and mixes that could require the use of a third projection PC3, or the introduction in the sensor's array of a fourth vQRS.…”

Section: Chemo-resistive Behavior Of Vqrs Exposed To Voc-h2o Mixesmentioning

confidence: 99%

“…Although the polar vapors studied are not true electrolytes, they can give rise to strong H-bonding with water molecules. In the vapor mixture polar molecules like acetone can be surrounded by several water molecules depending on the faction of both, to make a stable quasi clathrate structure [69]. Therefore, the structuring of water and VOC molecules according to the scheme described in Figure 10 could explain the fact that vQRS are not able to detect the same amount of acetone and ethanol molecules, compared to single vapors, when they are blended with the same quantity of water molecules (100 ppm).…”

Section: Chemo-resistive Behavior Of Vqrs Exposed To Voc-h 2 O Mixesmentioning

confidence: 99%

Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS

et al. 2018

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The anticipated diagnosis of various fatal diseases from the analysis of volatile organic compounds (VOC) biomarkers of the volatolome is the object of very dynamic research. Nanocomposite-based quantum resistive vapor sensors (vQRS) exhibit strong advantages in the detection of biomarkers, as they can operate at room temperature with low consumption and sub ppm (part per million) sensitivity. However, to meet this application they need to detect some ppm or less amounts of biomarkers in patients' breath, skin, or urine in complex blends of numerous VOC, most of the time hindered by a huge amount of water molecules. Therefore, it is crucial to analyze the effects of moisture on the chemo-resistive sensing behavior of carbon nanotubes based vQRS. We show that in the presence of water molecules, the sensors cannot detect the right amount of VOC molecules present in their environment. These perturbations of the detection mechanism are found to depend on the chemical interactions between water and other VOC molecules, but also on their competitive absorption on sensors receptive sites, located at the nanojunctions of the conductive architecture. This complex phenomenon studied with down to 12.5 ppm of acetone, ethanol, butanone, toluene, and cyclohexane mixed with 100 ppm of water was worth to investigate in the prospect of future developments of devices analysing real breath samples in which water can reach a concentration of 6%.

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Molecular mobility and structure in water-acetone mixtures

Cited by 14 publications

References 5 publications

A simple method for the determination of the pore radius of ion channels in planar lipid bilayer membranes

A simple method for the determination of the pore radius of ion channels in planar lipid bilayer membranes

Characterization of thin water layers in pulp by tritium exchange. Part 1: Methods development

Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS

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