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Influence of the ambient temperature on water and diiodomethane contact angle with quartz surface

100%
Terpiłowski K.
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
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2015
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vol. 70
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issue 1
EN
Wettability of solids is a key phenomenon in many processes. One should mentioned those which accompany us in our everyday life i.e. washing or cementing as well as those applied in industry e.g. flotation of minerals. Value of the contact angles are affected by many factors. One of them is temperature. In this paper monocrystaline quartz was used in the investigations which were carried out in the range 5−50°C with the step every 5°C. As follows the value of the contact angle of both water and diiodomethane changes with the increasing temperature. The change of its value for water is much larger than in case of another liquids of apolar character. Using Chibowski approach the apparent surface free energy was calculated in two ways with and without correction about temperature change of the surface tension. The calculation show difference between both results. Taking into consideration another value of the surface tension should not be neglected even if measurements is taken at a temperature close to 20°C which is the standard in one in such measurements.
2
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Influence of Volume Drop on Surface Free Energy of Glass

51%
Rymuszka D., Terpiłowski K., Hołysz L.
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EN
The aim of the research was to determine how the drop size affects the contact angle values and determine its optimal size for further contact angle measurements and comparison of the contact angle values measured for three probe liquids (water, formamide, diiodomethane) on the glass surface using the: sessile drop and tilting plate methods. Next, using the measured contact angles, the total surface free energy and its components were determined from the van Oss et al. (Lifshitz-van der Waals acid- base component, LWAB), Owens-Wendt, Neumann and contact angle hysteresis (CAH) approaches. The studies showed, that drop size is very important for contact angle measurements and consequently, for surface free energy estimation.
3

Changes in surface properties of polymethylmethacrylate (PMMA) treated with air plasma

51%
Rymuszka D., Terpiłowski K., Hołysz L., Chibowski E.
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
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2015
|
vol. 70
|
issue 1
EN
Artykuł nie zawiera abstraktu.
4
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Comparison of contact angle measurement methods of liquids on metal alloys

51%
Terpiłowski K., Hołysz L., Rymuszka D., Banach R.
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
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2016
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vol. 71
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issue 1
EN
The paper presents the studies of metal wettability using two methods: the sessile droplet and immersion ones. Based on the measured contact angles, there was calculated apparent surface free energy from the acidic–basic approach and the contact angle hysteresis. The advancing contact angles measured using the immersion method exhibit a little higher values than those measured by the sessile droplet method. The application of the immersion method leads to obtaining higher contact angle hysteresis. Both methods give different values of contact angles but they can be applied independently for estimation of metal surface wettability.
5
Content available remote

Effect of solution pH on the stability of mixed silica -alumina suspension in the presence of polyacrylic acid (PAA) with different molecular weights

39%
Wiśniewska M., Terpiłowski K., Chibowski S., Urban T., Zarko V., Gun’ko V.
Open Chemistry
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2013
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vol. 11
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issue 1
101-110
EN
The influence of solution pH (in the range 3–9) on mixed silica-alumina suspension in the absence and presence of polyacrylic acid (PAA) was studied. The composition of the adsorbent was SiO2 (97%) and Al2O3 (3%). The turbidimetry method was applied to record changes in the stability of the investigated systems as a function of time. It was shown that the suspension without the polymer is less stable at pH 3, whereas at pH 6 and 9, the systems were stable. PAA with molecular weights 100 000 and 240 000 at pH 3 (improvement of system stability conditions) and PAA 2 000 at pH 6 (deterioration of suspension stability) have a great effect on the silica-alumina suspension stability. The stabilization-flocculation properties of polyacrylic acid are a result of a specific conformation of its chains on the solid surface where it depends on the solution pH and the polymer molecular weight.
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