Degradation of polycaprolactone electrospun materials - methods of analysis
Havlíčková, K.; Řezanka, M.; Kobera, Libor; Kuželová Košťáková, E.; Lukáš, D.; Jenčová, V.
2021 - anglický Biodegradable electrospun materials are widely used for medical application. Polycaprolatone is polymer suitable for electrospinning technology and is very often used to create nanofibrous scaffolds for tissue engineering. The time to disintegration or biodegradation of such materials is very important here. However, testing is not entirely easy. It is not possible to create exactly body-like conditions in vitro. Moreover, it is not easy to find suitable analytical methods that would show exactly what happens in the nanofibrous polycaprolactone electrospun samples at certain stages of degradation, ie how the internal structure of decaying nanofibers changes. This paper describes the traditional use of methods for testing polycaprolatone nanofibers by enzymatically catalysed degradation. Morphological changes are studied using scanning electron microscope images. However, it also offers a non-traditional analysis of polycaprolactone electrospun materials using the ssNMR method. Klíčová slova: electrospinning; nanofibers; enzymatic degradation Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Degradation of polycaprolactone electrospun materials - methods of analysis

Biodegradable electrospun materials are widely used for medical application. Polycaprolatone is polymer suitable for electrospinning technology and is very often used to create nanofibrous scaffolds ...

Havlíčková, K.; Řezanka, M.; Kobera, Libor; Kuželová Košťáková, E.; Lukáš, D.; Jenčová, V.
Ústav makromolekulární chemie, 2021

Anticorrosive properties of silicotungstic acid and phosphotungstic heteropolyacid in the paint films
Nechvílová, K.; Kalendová, A.; Stejskal, Jaroslav
2016 - anglický The aim of this work was to provide an initial characterisation of heteropolyacids and examine their behaviour and properties as pigments in paints using different concentrations of the pigment and filler. Solvent-based epoxy-ester resin served as the binder. The paints were applied to steel and glass panels for mechanical and corrosion resistance testing. The organic coatings were exposed to a corrosive atmosphere with NaCl. This test was completed with electrochemical measurement. The parameters examined included the paint film's mechanical and anticorrosion efficiency. The environments in which the new coatings are most efficient were also sought. Klíčová slova: heteropolyacids; epoxy-ester resin; organic coatings Dokument je dostupný na externích webových stránkách. Anticorrosive properties of silicotungstic acid and phosphotungstic heteropolyacid in the paint films

The aim of this work was to provide an initial characterisation of heteropolyacids and examine their behaviour and properties as pigments in paints using different concentrations of the pigment and ...

Nechvílová, K.; Kalendová, A.; Stejskal, Jaroslav
Ústav makromolekulární chemie, 2016

The influence of compression pressure on transport properties of polypyrrole nanotubes
Alekseeva, E.; Prokeš, J.; Bober, Patrycja; Stejskal, Jaroslav
2015 - anglický Klíčová slova: conducting polymer; polypyrrole nanotubes Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. The influence of compression pressure on transport properties of polypyrrole nanotubes

Alekseeva, E.; Prokeš, J.; Bober, Patrycja; Stejskal, Jaroslav
Ústav makromolekulární chemie, 2015

Ultrathin nanofibrous membranes with enhanced properties for transplantation of retinal pigment epithelial cells
Studenovská, Hana; Popelka, Štěpán; Abelová, Lucie; Riedel, Tomáš; Studený, P.; Straňák, Z.; Klíma, Jiří; Ardan, Taras; Dvořánková, B.; Rypáček, František
2015 - anglický Klíčová slova: retinal tissue engineering; nanofibrous membrane; fibrin coating Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Ultrathin nanofibrous membranes with enhanced properties for transplantation of retinal pigment epithelial cells

Studenovská, Hana; Popelka, Štěpán; Abelová, Lucie; Riedel, Tomáš; Studený, P.; Straňák, Z.; Klíma, Jiří; Ardan, Taras; Dvořánková, B.; Rypáček, František
Ústav makromolekulární chemie, 2015

Polymers based on chemically modified starch
Horák, Pavel; Kruliš, Zdeněk; Šárka, E.; Kobera, Libor
2014 - anglický In our research, we are developing materials based on chemical modified wheat starch ant its derivatives. The starch is esterified with various acids or acid anhydrides, e.g. acetic or propionic acid. Main goal of this work is to determine the degree of substitution, which has significant relevance in study of modified saccharides. it was done using three different techniques - acid-base titration, elemental analysis and nuclear magnetic resonance spectroscopy. Klíčová slova: starch; chemical modification; degree of substitution Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Polymers based on chemically modified starch

In our research, we are developing materials based on chemical modified wheat starch ant its derivatives. The starch is esterified with various acids or acid anhydrides, e.g. acetic or propionic acid. ...

Horák, Pavel; Kruliš, Zdeněk; Šárka, E.; Kobera, Libor
Ústav makromolekulární chemie, 2014

A study of silver nanoparticle behavior in liquid media for ecotoxicity tests
Opršal, J.; Pouzar, M.; Knotek, P.; Šlouf, Miroslav; Pavlova, Ewa
2012 - anglický The up to date increasing number of nanotechnology applications is linked with a serious danger of environmental pollution by nanomaterials. Consequently, the ecotoxicity testing of nanomaterials becomes an essential part of nanotechnology development. Classical ecotoxicity tests suffer with a number of complications when used for nanomaterials. In the case of aquatic toxicity tests, the nanoparticle agglomeration in the liquid media is a fundamental problem. The aim of this work is to evaluate the influence of important physico-chemical parameters (nanoparticle concentration and illumination conditions) on an agglomeration of 40 nm silver nanoparticles (AgNPs) in a liquid media prescribed for fish eco-toxicity test by the OECD 203 guideline (Medium 203). Klíčová slova: nanoparticles; lequid media; ecotoxicity Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. A study of silver nanoparticle behavior in liquid media for ecotoxicity tests

The up to date increasing number of nanotechnology applications is linked with a serious danger of environmental pollution by nanomaterials. Consequently, the ecotoxicity testing of nanomaterials ...

Opršal, J.; Pouzar, M.; Knotek, P.; Šlouf, Miroslav; Pavlova, Ewa
Ústav makromolekulární chemie, 2012

Electrical conductivity of polyaniline-silver nanocomposites
Varga, M.; Prokeš, J.; Bober, Patrycja; Stejskal, Jaroslav
2012 - anglický Klíčová slova: polyaniline; composites; silver Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Electrical conductivity of polyaniline-silver nanocomposites

Varga, M.; Prokeš, J.; Bober, Patrycja; Stejskal, Jaroslav
Ústav makromolekulární chemie, 2012

The use of real time PCR method for evaluation of magnetic microspheres
Trachtová, Š.; Rittich, B.; Horák, Daniel; Španová, A.
2012 - anglický The real-time quantitative PCR (qPCR) was used for the evaluation of non-porous HEMA-based magnetic microspheres on the PCR course (PCR sensitivity). It was shown that 1-10 mu l microsphere suspensions (2 mg/ml) in PCR mixtures do not interfere in the PCR. It can be assumed that the magnetic nuclei were covered with polymer layer. Klíčová slova: magnetic microspheres; real time PCR Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. The use of real time PCR method for evaluation of magnetic microspheres

The real-time quantitative PCR (qPCR) was used for the evaluation of non-porous HEMA-based magnetic microspheres on the PCR course (PCR sensitivity). It was shown that 1-10 mu l microsphere ...

Trachtová, Š.; Rittich, B.; Horák, Daniel; Španová, A.
Ústav makromolekulární chemie, 2012

Double layer humidity sensor based on phthalocyanine derivatives
Rakušan, J.; Karásková, M.; Hamáček, A.; Řeboun, J.; Kubáč, L.; Černý, J.; Rais, David; Nešpůrek, Stanislav
2011 - anglický New type of humidity sensors based on double layer structure consisting of hydrophilic and hydrophobic phthalocyanine derivatives is presented. The sensor shows high sensitivity in the range from 20 to 90 % relative humidity (RH), good long-time stability and fast response. The impedance change vs. RH is quasi-linear in semilogarithmic plot and fully reversible. Klíčová slova: humidity sensor; phthalocyanines; double layer structure Dokument je dostupný na externích webových stránkách. Double layer humidity sensor based on phthalocyanine derivatives

New type of humidity sensors based on double layer structure consisting of hydrophilic and hydrophobic phthalocyanine derivatives is presented. The sensor shows high sensitivity in the range from 20 ...

Rakušan, J.; Karásková, M.; Hamáček, A.; Řeboun, J.; Kubáč, L.; Černý, J.; Rais, David; Nešpůrek, Stanislav
Ústav makromolekulární chemie, 2011

Swelling and mechanical properties of particulate composites with matrix in rubbery state
Dušek, Karel; Dušková-Smrčková, Miroslava; Šomvársky, J.; Nezbedová, E.; Náhlík, Luboš
2011 - anglický Klíčová slova: swelling; mechanical properties Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Swelling and mechanical properties of particulate composites with matrix in rubbery state

Dušek, Karel; Dušková-Smrčková, Miroslava; Šomvársky, J.; Nezbedová, E.; Náhlík, Luboš
Ústav makromolekulární chemie, 2011