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 ...
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
Wheat B-starch based polymeric materials
Kotek, Jiří; Kruliš, Zdeněk; Šárka, E.
2011 - anglický
The contribution is aimed at preparation of a thermoplastic material derived from the wheat B-starch. Two ways have been followed, namely blending of the starch with poly(ε-caprolactone) (PCL) and plasticizing of the starch. In both cases, properties of the materials based on the B-starch are comparable to analogous materials based on the A-starch. The prepared materials have potential application as biodegradable films for agriculture.
Klíčová slova:
biodegradable plastic; polycaprolactone; B-starch
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Wheat B-starch based polymeric materials
The contribution is aimed at preparation of a thermoplastic material derived from the wheat B-starch. Two ways have been followed, namely blending of the starch with poly(ε-caprolactone) (PCL) and ...
Hybrid structures based on montmorillonite/modified starch intercalate
Duchek, P.; Špírková, Milena
2010 - anglický
Intercalates based on several commercial cationized starches with degree of substitution D=0.04-0.17, and sodium montmorillonite were prepared. The XRD analyses of resulting organic/inorganic hybrids proved that modification in the starch structure leads to embedding the polycation into montmorillonite clay gallery. Lower degree of starch cationization results in bigger enlargement of the interlayer space in the hybrid structure.
Klíčová slova:
organic/inorganic hybrides; montmorillonite
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Hybrid structures based on montmorillonite/modified starch intercalate
Intercalates based on several commercial cationized starches with degree of substitution D=0.04-0.17, and sodium montmorillonite were prepared. The XRD analyses of resulting organic/inorganic hybrids ...
Humidity sensor based on TiO2 nanoparticles and sodium salt of sulfonated AlOH phthalocyanine
Rakušan, J.; Karásková, M.; Hamáček, A.; Řeboun, J.; Rais, David; Nešpůrek, Stanislav
2010 - anglický
New type of humidity sensor based on TiO2 nanoparticles and sodium salt of sulfonated AlOH phthalocyanine is presented. The sensor shows high sensitivity due to the high surface area of TiO2 nanoparticles, good long-time stability and sensitivity in the range from 20 to 80 % RH. The response is linear in semilogarithmic plot – logarithm of impedance vs. RH and fully reversible.
Klíčová slova:
humidity sensor; TiO2; phthalocyanines
Dokument je dostupný na externích webových stránkách.
Humidity sensor based on TiO2 nanoparticles and sodium salt of sulfonated AlOH phthalocyanine
New type of humidity sensor based on TiO2 nanoparticles and sodium salt of sulfonated AlOH phthalocyanine is presented. The sensor shows high sensitivity due to the high surface area of TiO2 ...
Novel nanocomposite materials for power engineering
Boček, J.; Matějka, Libor; Mentlík, V.
2010 - anglický
The epoxy-POSS nanocomposites were prepared and their electrical/dielectric and thermomechanical properties were determined. The mono- and octa-epoxyfunctionalized POSS (POSS,E1 and POSS,E8) were covalently incorporated in the epoxy network matrix DGEBA- 3,3’-dimethyl-4,4’-diaminocyclohexylmethane (Laromin C260) as pendant units or as polyhedral junctions, respectively. While the POSS junctions are well dispersed in the hybrid network DGEBA-Laromin-POSS,E8, the pendant POSS aggregate to form large crystalline POSS domains.
Klíčová slova:
nanocomposite; epoxy resin; insulating system
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Novel nanocomposite materials for power engineering
The epoxy-POSS nanocomposites were prepared and their electrical/dielectric and thermomechanical properties were determined. The mono- and octa-epoxyfunctionalized POSS (POSS,E1 and POSS,E8) were ...
Cation and anion exchangers from nanofibrous polystyrene for fast water treatment
Marek, J.; Beneš, Milan J.; Jelínek, L.
2009 - anglický
Strongly acidic sulfonovaný cation exchanger on polystyrene nanofibrous matrix (Nanospider TM technology) was prepared by simultaneous sulfonation and crosslinking. Weakly basic nanofibrous anion exchanger was prepared after transformation of sulfogroups to sulfochloride by reaction with ethylene diamine. Nanofibrous products were characterized by sorption capacity. They have sorption kinetic significantly faster in comparison with standard granular ion exchangers. Současnou sulfonací a síťováním byl připraven silně kyselý sulfonový katex na polystyrenové nanovláknité matrici (Nanospider TM technologie). Slabě bázický anex byl připraven po převedení sulfoskupin na sulfochlorid reakci s ethylen diaminem. Nanovláknité produkty byly charakterizovány pomocí sorpční kapacity. Mají kinetiku sorpce výrazně rychlejší než standardní sorbenty granulární.
Klíčová slova:
polystyrene; nanofiber; ion exchanger
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Cation and anion exchangers from nanofibrous polystyrene for fast water treatment
Strongly acidic sulfonovaný cation exchanger on polystyrene nanofibrous matrix (Nanospider TM technology) was prepared by simultaneous sulfonation and crosslinking. Weakly basic nanofibrous anion ...
Self-assembled nanostructures in copolymer blends: SAXS, SANS and TEM study
Holoubek, Jaroslav; Baldrian, Josef; Hromádková, Jiřina; Steinhart, Miloš
2009 - anglický
Phenomena associated with the phase behaviour and self-assembled nanostructures of three block copolymer systems have been studied by small-angle X-ray scattering (SAXS), small-angle neutron scattering (SANS) and transmision electron microscopy (TEM)
Klíčová slova:
total hip replacement; polyethylene wear; aseptic loosening
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Self-assembled nanostructures in copolymer blends: SAXS, SANS and TEM study
Phenomena associated with the phase behaviour and self-assembled nanostructures of three block copolymer systems have been studied by small-angle X-ray scattering (SAXS), small-angle neutron ...
Surface properties of polyethylene grafted by plasma
Novák, I.; Nedelčev, T.; Krupa, I.; Števiar, M.; Chodák, I.; Mosnáček, J.; Špírková, Milena; Chehimi, M. M.
2008 - anglický
The aim of the paper is an investigation of surface properties of the polyethylene modified by radio-frequency discharge plasma as well as of the polymer modified by plasma and subsequently grafted with alkoxyvinylsilanes. Cílem tohoto příspěvku je studium povrchových vlastností polyethylenu modifikovaného radiofrekvenčním plasmovým výbojem a plasmou modifikovaného polymeru s naroubovanými alkoxyvinylsilany.
Klíčová slova:
polyethylene; surface properties
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Surface properties of polyethylene grafted by plasma
The aim of the paper is an investigation of surface properties of the polyethylene modified by radio-frequency discharge plasma as well as of the polymer modified by plasma and subsequently grafted ...
Metal organophosphonates and their intercalation compounds as inorganic-organic hydrid materials and nanomaterials
Zima, Vítězslav; Svoboda, Jan; Melánová, Klára; Beneš, L.
2008 - anglický
We prepared several new phenylphosphonates and 4-carboxyphenylphosphonates of alkaline earth metals and copper and characterized them by powder X-ray diffraction, thermogravimetric analysis, energy-dispersive X-ray analysis, elemental analysis and infrared spectroscopy. For four of these compounds, their structure was determined from their powder X-ray diffraction patterns using an ab initio FOX program. The prepared alkaline-earth phenylphosphonates with general formula MeC6H5PO3yH2O (Me = Ca, Sr, Ba) were found to be suitable hosts for intercalation reactions. Připravili jsme několik nových fenylfosfonátů a 4-karboxyfenylfosfonátů kovů alkalických zemin a mědi a charakterizovali je pomocí práškové rentgenové difrakce, termogravimetrické analýzy, EDX, elem. analýzy a infračervené spektroskopie. Byla určena struktura čtyřech těchto sloučenin pomocí ab initio programu FOX z práškových rtg. dat. Připravené fenylfosfonáty alkalických kovů se ukázaly být vhodnými hostitelskými materiály pro interkalační reakce.
Klíčová slova:
intercalation
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Metal organophosphonates and their intercalation compounds as inorganic-organic hydrid materials and nanomaterials
We prepared several new phenylphosphonates and 4-carboxyphenylphosphonates of alkaline earth metals and copper and characterized them by powder X-ray diffraction, thermogravimetric analysis, ...
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