National Repository of Grey Literature 26 records found  beginprevious21 - 26  jump to record: Search took 0.00 seconds. 
Utilization of advanced rheological techniques for the study of biological systems
Krňávková, Šárka ; Kráčalík, Milan (referee) ; Smilek, Jiří (advisor)
A new method for determining viscoelastic properties on the interfacial interface called interfacial rheology was intoduced and investigated. Measured data were compared with data from tanziometer for model system of surfactant. Three concentration renge of surfactant, namely SDS (anionic), TTAB (cationic) and Tween (nonionic), were measured. From the measured data the influence of structure, critical micellar concentration and charge on the viscoelastic properties of the interfacial interface was determined. Furthermore, this new method was used for biological systems and specifically for biofilms of two bacterial strains. First, the viscoelastic properties of biofilms on the agar were determined, and the viscoelastic properties dependence on temperature
Microrheology of Biocolloids
Hnyluchová, Zuzana ; Omelka, Ladislav (referee) ; Kráčalík, Milan (referee) ; Pekař, Miloslav (advisor)
The main aim of the doctoral thesis was study of passive microrheological techniques as advanced methods for characterisation of viscoelastic properties of soft material. These techniques are able to provide certain advantaged or additional information on classical rheology. Several techniques from the wide range of passive microrheological group such as one particle video – microrhelogy with IDL data procesing, microrheology based on light scattering – DLS or FCS microrheology have been applied in practice during my PhD studies. New Matlab script has been also invented to simply obtain information about viscosity of low volume samples. Aplicability of techniques were studied on several various bicolloids such as solutions or gels of hyaluronic acid, on study of properties at the interfaces or on gelation proces studies of agarose. Obtained data were compared classical rheology results. Suitability of each technique for investigated systems or appropriate reccomendations for further measurements were didcussed based on obtained data. Main advantages and limites of passive microrheology techniques were also described in comparison wih classical rheology method.
Uplatnění preventivního přístupu k odpadovému hospodářství a navýšení aplikační hodnoty polymerů: Využití nanotechnologie pro nalezení efektivní metody recyklace PET lahví
Ústav makromolekulární chemie AV ČR, Praha ; Studenovský, Martin ; Sikora, Antonín ; Puffr, Rudolf ; Mikešová, Jana ; Labská, Milada ; Kráčalík, Milan
Zpráva je rozdělena do několika částí: 1. Zaměření projektu (současná situace v oblasti recyklace PET lahví, charakterizace materiálu, recyklace PET a polymerní nanokompozity. 2. Použité metody hodnocení nanokompozitů (reologie taveniny nanokompozitu, WAXS - širokoúhlá rentgenová spektroskopie, TEM /SEM/ - transmisní (scanovací/ elektronová mikroskopie, DSC - diferenciální scanovací kalorimetrie, mechanické vlastnosti za působení jednoosého protažení). 3. Experimentální část (použité materiály, příprava nanokompozitu recyklovaný PET/jíl, morfologie připravených nanokompozitů, reologické charakteristiky, mechanické vlastnosti).
Uplatnění preventivního přístupu k odpadovému hospodářství a navýšení aplikační hodnoty polymerů: Využití nanotechnologie pro nalezení efektivní metody recyklace PET lahví
Ústav makromolekulární chemie AV ČR, Praha ; Labská, Milada ; Sikora, Antonín ; Puffr, Rudolf ; Studenovský, Martin ; Mikešová, Jana ; Kráčalík, Milan
Zpráva se zabývá současnou situací v oblasti recyklace PET lahví, obsahuje charakterizaci materiálu - polyethylentereftalát (PET), popis recyklace polyethylentereftalátu, popis polymerních nanokompozitů a použitých metod hodnocení nanokompozitů. V experimentální části se zabývá přípravou nanokompozitu recyklovaný PET/jíl.
Nanotechnology as potential method for recycling of PET bottles
Kráčalík, Milan ; Mikešová, Jana ; Pospíšil, L. ; Fortelný, Ivan ; Šimoník, J.
Recycling of PET worldwide is not sufficient. This issue results from decreasing molecular weight due to thermal, mechanical and hydrolytic degradation during multiple processing of polymer. The viscosity (next processability) of material can be increased by preparation of nanocomposites (formation of physical network in the polymer/clay system). The improved processing and utility properties of recycled PET were analyzed by rheology, morphology and tensile tests.
Nanokompozity typu recyklát PET/organo-jíl
Kráčalík, Milan ; Puffr, Rudolf ; Pospíšil, L. ; Hrnčiřík, J. ; Fortelný, Ivan ; Šimoník, J.
The processable recycled PET/organo-clay nanocomposites were prepared via melt compounding method as a new possibility of recovery of the used PET bottles. XRD and rheological measurements revealed intercalation of polymer chains into the silicate gallery and significant increase of melt strength of the material, which result in improvement of processability of regranulate.

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