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Fixed-charge examination by surface energy measurement
Mojrová, Barbora ; Boušek, Jaroslav (referee) ; Hégr, Ondřej (advisor)
This work is deal with development of alternative method measuring fixed charge in thin dielectric layers by surface tension. Presence fixed charge takes effect so-called Back Surface Field (BFS), which helps to decrease surface recombination velocity on back side of solar cell. In work is described experimental measuring on dielectric layers Al2O3, AlN, SiNx, Y2O3 and PSG deposit on crystalline silicon wafers. Surface tension (it is the same like surface free energy) is analyzed from contact angle size using See System.
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Surface modification of biomaterials in the dielectric barrier discharge
Maruniak, Marek ; Přikryl, Radek (referee) ; Mazánková, Věra (advisor)
The work deals with the treatment of surfaces of various polymeric biomaterials using a plasma generated at atmospheric pressure. Plasma is generated between two electrodes among which is inserted dielectric material. By using this type of discharge, the difference of treated material surface quality is being examined, ie. surface energy and contact angle according to the time of processing. Evaluation of the results of surface analysis was performed by the method of measuring the contact angle and surface energy using the apparatus See System. The goal was to compare the surface quality change, before and after processing in the plasma, as also its dependency on the time of aging. The results differs according to the type of material.
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Surface modification of biomaterials in the dielectric barrier discharge
Maruniak, Marek ; Přikryl, Radek (referee) ; Mazánková, Věra (advisor)
The work deals with the treatment of surfaces of various polymeric biomaterials using a plasma generated at atmospheric pressure. Plasma is generated between two electrodes among which is inserted dielectric material. By using this type of discharge, the difference of treated material surface quality is being examined, ie. surface energy and contact angle according to the time of processing. Evaluation of the results of surface analysis was performed by the method of measuring the contact angle and surface energy using the apparatus See System. The goal was to compare the surface quality change, before and after processing in the plasma, as also its dependency on the time of aging. The results differs according to the type of material.
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Fixed-charge examination by surface energy measurement
Mojrová, Barbora ; Boušek, Jaroslav (referee) ; Hégr, Ondřej (advisor)
This work is deal with development of alternative method measuring fixed charge in thin dielectric layers by surface tension. Presence fixed charge takes effect so-called Back Surface Field (BFS), which helps to decrease surface recombination velocity on back side of solar cell. In work is described experimental measuring on dielectric layers Al2O3, AlN, SiNx, Y2O3 and PSG deposit on crystalline silicon wafers. Surface tension (it is the same like surface free energy) is analyzed from contact angle size using See System.
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Material hydrophility and hydrophobicity measurements
SEDLÁK, Jiří
The aim of this thesis is to find out using a method based on the size of the contact angle as changes over time surface free energy density polyethylene. Measured samples of discharges were adjusted by varying plasma and increased its surface tension. The theoretical part deals with the surface tension, contact angle and the Young's equation, which describes the relationship between wetting angle and energy at the interface states of matter. This work also mentions the ways in which the measurement is made. In the practical part of the thesis there is described not only the process of measuring, but also the own experiments and their results.
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