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1
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Solvation of Alcohols in n-Heptane and n-Propanol from the Acoustic Passynski Method

100%
Gliński J., Burakowski A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-109-A-113
EN
The method of Passynski of calculating the solvation numbers from compressibility was applied to solutions of short-chained normal alcohols in n-heptane and n-propanol. The dependences of solvation numbers on length of the solute molecules are surprisingly similar for both solvents. Applicability of the acoustic method for determining the solvation numbers in nonaquous systems, as well as for investigation of intermolecular interactions in them was proved. Some structural similarity of associated alcohol and hydrocarbon in liquid state is suggested.
2
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Hydration of the Zwitterionic Forms οf Amino Acids from the Acoustic Passynski Method

100%
Burakowski A., Gliński J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-39-A-44
EN
In this communication, we report the compressibility measurements made on amino acids in water at 25°C, compared with aqueous short-chained amines and carboxylic acids. The effect of the charge caused by protonation of the amino group and/or deprotonation of the carboxylic one was tested. The concept of additivity of the hydration number with the constituents of solute molecule was applied and discussed.
3
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Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Acetamide

81%
Jerie K., Baranowski A., Gliński J., Orzechowski K.
Acta Physica Polonica A
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1996
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vol. 90
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issue 6
1169-1177
EN
The experimental results of positron annihilation experiments in aqueous solutions of acetamide were compared to those of ultrasonic velocity. The system under investigation behaves untypically when changing acetamide concentration. From the point of view of surface tension it interacts with water like normal alcohols, while the positron annihilation and ultrasonic results suggest hydrophilic hydration and lack of hydrophobic interactions.
4
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Structure of Carbon Tetrachloride + t-Butanol Mixtures from Positron Annihilation and Ultrasonic Velocity Measurements

81%
Jerie K., Baranowski A., Gliński J.
Acta Physica Polonica A
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1993
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vol. 83
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issue 3
313-320
EN
The densities of and sound velocities in t-butyl alcohol solutions in CCl_{4} were determined in temperature range 25 to 45°C. From these data the adiabatic compressibility coefficients of the solutions were calculated, as well as excess densities and compressibilities. The positron annihilation spectrum for this system in room temperature was measured. The results plotted against alcohol concentration suggest that the structural processes occurring in this system are caused by dimerization of the solute molecules.
5
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Structure of Aqueous Solutions of Tetramethylammonium Chloride Investigated by Positron Annihilation and Ultrasonic Methods

81%
Jákli G., Jerie K., Baranowski A., Gliński J.
Acta Physica Polonica A
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1998
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vol. 93
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issue 4
649-658
EN
The structure of aqueous solutions of tetramethylammonium chloride was investigated using sound velocity and positron annihilation methods. The results are different than those obtained earlier for systems where hydrophobic hydration occurs, although some evidences for formation of clathrate-like hydrates in liquid phase were observed. The results are interpreted, among others, in terms of competition of different hydrates of tetraalkylammonium cations, hydration of chloride anions, and formation of ionic pairs.
6
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Structure of Cyclohexane + t-Butanol Mixtures from Positron Annihilation and Ultrasonic Velocity Measurements

81%
Jerie K., Baranowski A., Gliński J.
Acta Physica Polonica A
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1993
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vol. 83
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issue 3
321-326
EN
The densities of and sound velocities in t-butyl alcohol solutions in cyclohexane were determined in the temperature range 25 to 45°C. From these data adiabatic compressibility coefficients of the solutions were calculated, as well as excess densities and compressibilities. The positron annihilation spectra of the solutions were measured at room temperature. The results plotted against alcohol concentration show structural processes, which can be attributed to dimerization of the solute molecules.
7
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Positron Annihilation in and Adiabatic Compressibility of Ethylene Glycol Aqueous Solutions

81%
Baranowski A., Jerie K., Gliński J., Orzechowski K.
Acta Physica Polonica A
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1995
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vol. 88
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issue 1
59-66
EN
The positron annihilation lifetime and ultrasonic velocity in aqueous ethylene glycol solutions were measured. A comparison between the concen­tration and temperature dependences of the above parameters suggests that there is a competition of hydrophobic (interstitial) and hydrophylic (substi­tutional) hydration.
8
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Positron Annihilation in and Compressibility of Water-Organic Solutions. The System Water-Pyridine

81%
Jerie K., Baranowski A., Gliński J., Jeżowska-Trzebiatowska B.
Acta Physica Polonica A
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1992
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vol. 82
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issue 3
471-479
EN
The results of positron lifetime and ultrasonic velocity measurements in dilute aqueous pyridine (PYR) solutions show unusual changes in ultrasonic, annihilation data in function of pyridine concentration. The results obtained suggest that strong structural changes occur in the system, in the region of low pyridine concentrations. Liquid clathrate hydrates forming in the system are supposed with unusual stoichiometry and untypical geometry. They are supposed to be very short-living and/or unstable.
9
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Structure of Aqueous Solutions of 1,2- and 1,3-Propanediol Investigated by Positron Annihilation and Ultrasonic Methods

81%
Jerie K., Baranowski A., Gliński J., Orzechowski K.
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vol. 95
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issue 4
562-567
EN
The structure of aqueous solutions of 1,2-propanediol and 1,3-propane-diol was investigated using adiabatic compressibility measurements and positron annihilation methods. The experimental results are different than those obtained earlier for systems where hydrophobic hydration dominates. There are some evidences for increased rigidity of the water network, which can arise from the formation of hydrogen bonds between diols and water.
10
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Annihilation of o-Positronium in the Vicinity of the Critical Mixing Point

81%
Jerie K., Baranowski A., Gliński J., Orzechowski K.
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vol. 95
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issue 4
569-574
EN
Positron annihilation spectra were investigated in the critical region close to the consolute point of ethanol + dodecane mixture. The anomalies of the positron lifetimes and intensities were small, nevertheless it was found that the intensity of short-living components of annihilation spectrum seems to increase close to the critical temperature.
11
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Hydrophobic-Like Solvation in Non-Aqueous Solutions: Positron Annihilation in and Compressibility of Tert-butanol and Tetramethylurea in Ethylene Glycol

81%
Jerie K., Baranowski A., Gliński J., Przybylski J.
Acta Physica Polonica A
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2001
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vol. 99
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issue 3-4
385-392
EN
The pioneer experimental results of positron annihilation experiments in non-aqueous solutions of tetramethylurea and tert-butanol were compared to those of ultrasonic velocity. For tert-butanol, the positron annihilation results exclude existence of hydrophobic-like interactions and formation of weak, labile crystalline-like solvates in solution. For tetramethylurea solute the changes of annihilation parameters with concentration are minor and only limited conclusions can be drawn on this system, while they are stronger for tert-butanol solute. However, all the above is consistent with an assumption that the more hydrophobic solute (tert-butanol) should affect the original glycol structure stronger than that interacting with glycol via hydrogen bondings only. On the other hand, the ultrasonic data for the systems tested, although very precise, hardly confirm formation of any specific structure. It is possible, however, that the solvates do not differ in their compressibility from the pure liquids, and/or are formed only in very small amounts. Thus, usefulness of the positron annihilation method in investigation of liquid structure was proven.
12
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Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Formamide

81%
Jerie K., Baranowski A., Gliński J., Orzechowski K.
Acta Physica Polonica A
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1994
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vol. 85
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issue 3
563-569
EN
The experimental results of positron annihilation experiments in aqueous solutions of formamide were compared to those of ultrasonic velocity. The systems under investigation behave untypically while changing formamide concentration. The results are explained in terms of hydrophilic hydration and lack of hydrophobic interactions.
13
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Positron Annihilation in and Adiabatic Compressibility of Water-Organic Solutions. The System Water-Dimethylsulfoxide

71%
Jerie K., Baranowski A., Rozenfeld B., Jeżowska-Trzebiatowska B., Gliński J.
Acta Physica Polonica A
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1991
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vol. 79
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issue 4
507-515
EN
The results of positron lifetime and ultrasonic velocity measurements in dilute aqueous dimethylsulfoxide (DMSO) solutions show the usual extreme characteristic for polar organic solutes. The results obtained suggest that strong structural changes occur in the system, in the region of low DMSO concentrations. Liquid clathrate hydrates forming in the system are supposed, with unusual stoichiometry and untypical geometry of the hydrates.
14
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Structure of Aqueous Solutions of Acetonitrile Investigated by Acoustic and Positron Annihilation Measurements

71%
Jerie K., Baranowski A., Koziol S., Gliński J., Burakowski A.
Acta Physica Polonica A
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2005
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vol. 107
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issue 5
826-831
EN
We report the results of acoustic and positron annihilation measurements in aqueous solutions of acetonitrile (CH_3CN). Hydrophobicity of the solute is discussed, as well as the possibility of describing the title system in terms of hydrophobic solvation. The concept of Levay et al. of calculating the "ideal positronium lifetimes is applied, basing on the mean volume of cavities (holes) in liquid structure available for positronium pseudoatom. The same calculations performed using the Tao model of annihilation yield very different results. It can be concluded that either acetonitrile forms with water clathrate-like hydrates of untypical architecture, or it is too weak hydrophobic agent to form clathrate-like hydrates at all. The former interpretation seems to be more probable.
15
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Structure of Aqueous Solutions of 1,2-, 1,3- and 1,4-Butanediol Investigated by Positron Annihilation and Ultrasonic Methods

71%
Jerie K., Baranowski A., Gliński J., Orzechowski K., Przybylski J.
Acta Physica Polonica A
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2001
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vol. 99
|
issue 3-4
393-398
EN
The structure of aqueous solutions of 1,2-, 1,3- and 1,4-butanediol was investigated using adiabatic compressibility measurements and positron annihilation methods. In the case of 1,2-butanediol the experimental results are very similar to those obtained earlier for systems where hydrophobic hydration dominates. In other cases there are evidences for increased rigidity of the water network, which arises from formation of hydrogen bonds between diols and water. Usefulness of both the methods applied in investigating the structure of liquid solutions was proved.
16
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Spectroscopic Studies of PrBr_{3}·7H_{2}O Monocrystal

71%
Oczko G., Legendziewicz J., Hanuza J., Gliński J., Macalik L.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
431-438
EN
Single crystals of praseodymium tribromide heptahydrate were grown from aqueous solution. The IR, Raman, and high resolution absorption spectra were measured at room and low temperatures. The assignments of IR and Raman frequencies are reported. The temperature dependence of intensities was found and vibronic coupling in f-f transitions was analysed. Anisotropy of the intensities of optical lines was detected and taken into account in the Judd-Ofelt analysis of the f-f transitions probabilities. The results are compared to the available IR and electron spectroscopic data for other single crystals of lanthanide bromides.
17
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Investigation of Sol-Gel Glasses Doped with Lanthanide Ions by Spectroscopic, Acoustic, and Positron Annihilation Methods

62%
Jerie K., Baranowski A., Legendziewicz J., Guzik M., Burakowski A., Gliński J.
Acta Physica Polonica A
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2006
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vol. 110
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issue 5
583-591
EN
The results of optical spectroscopic (UV-Vis, absorption, and emission), acoustic (sound velocity of precursor solutions, the solvation numbers of ions in these solutions), and positron annihilation of glasses are presented and discussed for silica glasses obtained by the alcoholic sol-gel technique, doped with selected lanthanides and with some addition of ethylene glycol. The aim of these investigations was the determination of the local structure of glass close to lanthanide ions and its influence on the optical properties of the material. The results show that the existence of alcohol-glycol solvates in glasses decrease the number of empty voids in its structure as well as the size of the remaining ones. One can suppose that this is caused by cooperative interactions of glycol molecules with the network of hydrogen bonds of the glass.
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