Browsing by Author "Krupa, I."
Now showing items 21-40 of 49
-
Mechanical and Electrical Properties of Styrene-Isoprene-Styrene Copolymer Doped with Expanded Graphite Nanoplatelets
Špitalský, Zdenk; Kratochvíla, Ján; Csomorová, Katarína; Krupa, Igor; Graça, Manuel P. F.; Costa, Luis C.... more authors ... less authors ( Hindawi Publishing Corporation , 2015 , Article)The molecular dynamics of a triblock copolymer and of expanded graphite nanoplatelets were investigated. Composites were prepared using the solution technique. The effects of filler addition and of filler-matrix interactions ... -
Mechanical, sorption and adhesive properties of composites based on low density polyethylene filled with date palm wood powder
AlMaadeed, Mariam A.; Nógellová, Zuzana; Mičušík, Matej; Novák, Igor; Krupa, Igor ( Elsevier Ltd , 2014 , Article)Low density polyethylene (LDPE) was blended with date palm wood powder (DPW) to prepare composites with concentrations of filler ranging from 10 to 70. wt.%. The Youn?s modulus of the composites significantly increased ... -
Nanocomposite photoactuators based on an ethylene vinyl acetate copolymer filled with carbon nanotubes
Czanikov� K.; Torras N.; Esteve J.; Krupa I.; Kas�k P.; Pavlova E.; Ra?ko D.; Chod�k I.; Omastov� M.... more authors ... less authors (2013 , Article)This paper reports strong, reversible actuation of nanocomposites on the base of ethylene vinyl acetate (EVA) filled with multiwalled (MWCNTs) and singlewalled carbon nanotubes (SWCNTs). The carbon nanotubes (CNTs) dispersion ... -
Nanomechanical properties of plasma treated polylactic acid
Koumoulos E.P.; Valentin M.; Dragatogiannis D.; Charitidis C.A.; Krupa I.; Novak I.... more authors ... less authors ( Maney Publishing , 2015 , Article)In this work, a radio frequency discharged plasma generated in air atmosphere by pressure has been used to modify polylactic acid (PLA) surface. The results were evaluated through nanoindentation testing. Contact angle ... -
Nematic opto-mechanical actuators for the fabrication of refreshable tactile systems
Torras N.; Zinoviev K.E.; Camargo C.J.; Campo E.M.; Campanella H.; Esteve J.; Marshal J.E.; Terentjev E.M.; Omastova M.; Krupa I.; Teplicky P.; Mamojka B.; Burns P.; Roder B.; Vallribera M.; Malet R.; Zuffanelli S.; Soler V.; Roig J.; Walker N.; Wenn D.; Vossen F.; Crompvoets F.M.H.... more authors ... less authors (2013 , Conference Paper)Nematic elastomers are promising materials for the fabrication of actuators due to their ability to reversibly contract and expand during phase transitions triggered by external stimuli. We present a refreshable tactile ... -
Novel enzyme-free multifunctional bentonite/polypyrrole/silver nanocomposite sensor for hydrogen peroxide detection over a wide pH range
Jlassi K.; Sliem M.H.; Eid K.; Krupa I.; Chehimi M.M.; Abdullah A.M.... more authors ... less authors ( MDPI AG , 2019 , Article)Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H2O2) over wide ranges of pH are important in various environmental applications. Herein, a versatile and ecofriendly approach is ... -
Optical fluorescent spider silk electrospun nanofibers with embedded cerium oxide nanoparticles
Kandas I.; Shehata N.; Hassounah I.; Sobol?iak P.; Krupa I.; Lewis R.... more authors ... less authors ( SPIE , 2018 , Article)The work demonstrates an electrospun nanocomposite of recombinant spider silk protein (rSSp) nanofibers with embedded cerium oxide (ceria) nanoparticles. RSSP (MaSp1) has been produced, extracted from goat milk, and ... -
Phase change materials for thermal energy storage applications in greenhouses: A review
Nishad S.; Krupa I. ( Elsevier Ltd , 2022 , Article)Greenhouses represent one of the largest energy-demanding sectors, requiring energy for indoor environment control for plant growth and crop yield. Thermal energy storage using phase change materials (PCMs) has been ... -
Photoactuating of materials designed for haptic aid-tablets for visually impaired people based on styrene-b-isoprene-b-styrene block copolymer nanocomposites
Ilčíková, Markéta; Czaniková, Klaudia; Mosnáček, Jaroslav; Mičušík, Matej; Kasák, Peter; Omastová, Mária; Chorvát Jr., Dušan; Krupa, Igor; Koynov, Kaloian; Slouf, M.... more authors ... less authors (2013 , Article)In this study, the photoactuation of styrene-b-isoprene-b-styrene (SIS) block copolymer containing multiwalled carbon nanotubes (MWCNT) is shown. In order to improve dispersion, the MWCNT were ovalently modified either by ... -
Piezoresistive sensors based on electrospun mats modified by 2D Ti3C2Tx MXene
Sobolčiak P.; Tanvir A.; Sadasivuni K.K.; Krupa I. ( MDPI AG , 2019 , Article)The preparation methodology and properties of electroconductive, electrospun mats composed of copolyamide 6,10 and Ti3C2Tx are described in this paper. Mats of several compositions were prepared from a solution of n-propanol. ... -
Piezoresponse, mechanical, and electrical characteristics of synthetic spider silk nanofibers
Shehata N.; Kandas I.; Hassounah I.; Sobol?iak P.; Krupa I.; Mrlik M.; Popelka A.; Steadman J.; Lewis R.... more authors ... less authors ( MDPI AG , 2018 , Article)This work presents electrospun nanofibers from synthetic spider silk protein, and their application as both a mechanical vibration and humidity sensor. Spider silk solution was synthesized from minor ampullate silk protein ... -
Polyzwitterionic Hydrogels in Engines Based on the Antipolyelectrolyte Effect and Driven by the Salinity Gradient
Zavahir S.; Krupa I.; Almaadeed S.A.; Tkac J.; Kasak P. ( American Chemical Society , 2019 , Article)In this paper, we propose and investigate an original approach to energy conversion based on polyzwitterionic hydrogels, which exhibit an antipolyelectrolyte effect that enables them to swell in salt water and shrink in ... -
Positive influence of expanded graphite on the physical behavior of phase change materials based on linear low-density polyethylene and paraffin wax
Krupa, Igor; Nógellová, Zuzana; Špitalský, Zdenko; Malíková, Marta; Sobolčiak, Patrik; Abdelrazeq, Haneen W; Ouederni, Mabrouk; Karkri, Mustapha; Janigová, Ivica; Al-Maadeed, Mariam Ali S A... more authors ... less authors ( Elsevier B.V. , 2015 , Article)The preparation of Phase Change Materials (PCM) with improved thermal conductivity, based on linear low-density polyethylene (LLDPE), paraffin wax with a melting point of approximately 42 °C and expanded graphite as well ... -
Preparation of progressive antibacterial LDPE surface via active biomolecule deposition approach
Habib S.; Lehocky M.; Vesela D.; Humpolíček P.; Krupa I.; Popelka A.... more authors ... less authors ( MDPI AG , 2019 , Article)The use of polymers in all aspects of daily life is increasing considerably, so there is high demand for polymers with specific properties. Polymers with antibacterial properties are highly needed in the food and medical ... -
Recycled polyethylene/paraffin wax/expanded graphite based heat absorbers for thermal energy storage: An artificial aging study
Abdelrazeq H.; Sobolciak P.; Al-Maadeed M.A.-A.; Ouederni M.; Krupa I. ( MDPI AG , 2019 , Article)An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and expanded graphite (EG) was investigated. The optimal ... -
Smart non-woven fiber mats with light-induced sensing capability
Krupa I.; Sobol?iak P.; Mrlik M. ( MDPI AG , 2020 , Article)This article is focused on the facile procedure for 2D graphene oxide (GO) fabrication, utilizing reversible de-activation polymerization approach and therefore enhanced compatibility with surrounding polymer matrix. Such ... -
Some theoretical aspects of tertiary treatment of water/oil emulsions by adsorption and coalescence mechanisms: A review
Sobolciak P.; Popelka A.; Tanvir A.; Al-Maadeed M.A.; Adham S.; Krupa I.... more authors ... less authors ( MDPI AG , 2021 , Article Review)The massive increase in the volumes of oily contaminated produced waters associated with various industrial sectors has initiated considerable technological and scientific efforts related to the development of new cleaning ... -
Spider silk fibers: Synthesis, characterization, and related biomedical applications
Shehata N.; Hassounah I.; Sobolciak P.; Krupa I.; Lewis R.; Kandas I.... more authors ... less authors ( Elsevier , 2019 , Book chapter)Compared to silkworm silks, spider silks (SS) are considered stronger, most elastic, and tougher biomaterials. Web-weaving spiders use impressive silks where the proteins in the silks can be described as virtually nondiverged. ... -
Superhydrophobic Polyester/Cotton Fabrics Modified by Barrier Discharge Plasma and Organosilanes
Novák I.; Valentin M.; Špitalský Z.; Popelka A.; Sestak J.; Krupa I.... more authors ... less authors ( Taylor and Francis Inc. , 2018 , Article)In this paper, diffuse coplanar surface barrier discharge plasma at atmospheric pressure has been used for surface modification of polyester/cotton (PESc) fabric, which was subsequently modified by sol–gel process using ... -
Tactile device based on opto-mechanical actuation of liquid crystal elastomers
Torras N.; Zinoviev K.E.; Camargo C.J.; Campo E.M.; Campanella H.; Esteve J.; Marshall J.E.; Terentjev E.M.; Omastov� M.; Krupa I.; Teplick? P.; Mamojka B.; Bruns P.; Roeder B.; Vallribera M.; Malet R.; Zuffanelli S.; Soler V.; Roig J.; Walker N.; Wenn D.; Vossen F.; Crompvoets F.M.H.... more authors ... less authors (2014 , Article)Nematic elastomers are promising materials for the fabrication of actuators due to their ability to reversibly contract and expand during phase transitions triggered by external stimuli. Thus, actuation can be produced on ...