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1
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Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Acetamide

100%
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.
2
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Positron Annihilation in and Adiabatic Compressibility of Ethylene Glycol Aqueous Solutions

100%
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.
3
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Structure of Aqueous Solutions of 1,2- and 1,3-Propanediol Investigated by Positron Annihilation and Ultrasonic Methods

100%
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.
4
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Annihilation of o-Positronium in the Vicinity of the Critical Mixing Point

100%
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.
5
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Positron Annihilation in and Compressibility of Water-Organic Mixtures. The System Water-Formamide

100%
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.
6
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Structure of Aqueous Solutions of 1,2-, 1,3- and 1,4-Butanediol Investigated by Positron Annihilation and Ultrasonic Methods

88%
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
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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.
7
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Positron Annihilation Lifetime Spectroscopy and Dielectric Measurements of Natural Kaolinite and Kaolinite Intercalated by Potassium Acetate

76%
Leluk K., Orzechowski K., Jerie K., Baranowski A., Słonka T., Głowiński J.
Acta Physica Polonica A
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2006
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vol. 110
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issue 5
621-629
EN
Intercalation of clay minerals consists in inserting of guest molecules into interlayer area. It results in expanding the interlayer distance and changes of physical and chemical properties of the material. Dielectric spectroscopy, positron annihilation lifetime experiments, X-ray, and thermoanalysis were jointly applied to investigate the structural changes accompanying intercalation.
8
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Photonic Liquid Crystal Fibers with Polymers

52%
Woliński T., Tefelska M., Mileńko K., Siarkowska A., Budaszewski D., Domański A., Ertman S., Orzechowski K., Rutkowska K., Sierakowski M., Nowinowski-Kruszelnicki E., Dąbrowski R., Mergo P.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
613-616
EN
Photonic liquid crystal fibers with polymers constitute a new solution based on liquid crystals and microstructured polymer optical fibers opening up new areas in innovative sensing and photonic devices applications. Compared with their silica-based microstructured fibers, it is easier to fabricate exotic microstructured polymer optical fibers by extrusion or drilling at low temperature; their nonlinearity is potentially stronger, the range of available polymers that may be drawn is more diverse and the biocompatibility of polymers is often better. Liquid crystals due to their attractive properties i.e., the high birefringence, high electro-optic and thermo-optic effects are a very good candidate for microstructured polymer optical fiber infiltration to obtain tunable all-in-fiber innovative photonic devices. The paper will discuss basic properties and possible applications of the polymer photonic liquid crystal fibers that will arise from their high optical tunability with external and internal factors. Current research effort is directed towards two main solutions: photonic crystal fibers and microstructured polymer optical fiber-based structures, both infiltrated with liquid crystals of tailored optical properties.
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