Browsing by Author "Nguyen Nhung Anh Huynh"
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- ItemA poly(3-hydroxybutyrate)-chitosan polymer conjugate for the synthesis of safer gold nanoparticles and their applications(Royal Society of Chemistry, 2018-01-01) Silvestri Daniele; Waclawek Stanislaw Witold; Sobel Bartłomiej; Torres Mendieta Rafael Omar; Novotný Vít; Nguyen Nhung Anh Huynh; Ševců Alena; Vellora Thekkae Padil Vinod; Müllerová Jana; Stuchlík Martin; Petrangeli Papini Marco; Černík Miroslav; Varma RajendraA facile and eco-friendly approach is developed for the synthesis of a poly(3-hydroxybutyrate)–chitosan (PHB–chit) polymer conjugate, which is an ideal material for the synthesis of safer gold nanoparticles (nAu). The synthesized products are characterized by various electron-based, optical and spectroscopic techniques including the catalytic activity and the stability/toxicity of nAu. In contrast to the conventional synthesis approaches, the use of PHB–chit results in generation of a highly stable and size-controlled nAu material that exhibits important catalytic activity towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol, and at the same time shows no toxicity against living bacterial systems such as Escherichia coli or Staphylococcus aureus. The synthesis route reported herein would inspire future developments that circumvent toxicity issues of relevance to living systems while performing common catalytic experimentation.
- ItemAn across&ndashspecies comparison of the sensitivity of different organisms to Pb&ndash based perovskites used in solar cells(Elsevier, 2020-01-01) Nguyen Nhung Anh Huynh; Rosická Petra; Ševců Alena
- ItemAlkenyl succinic anhydride modified tree-gum kondagogu: A bio-based material with potential for food packaging(ELSEVIER SCI LTD, 2021-01-01) Venkateshaiah Abhilash; Havlíček Karel; Timmins Renee L.; Röhrl Maximilian; Waclawek Stanislaw Witold; Nguyen Nhung Anh Huynh; Černík Miroslav; Vellora Thekkae Padil Vinod; Agarwal Seema
- ItemAttached and planktonic bacterial communities on bio-based plasticgranules and micro-debris in seawater and freshwater(Elsevier, 2021-01-01) Nguyen Nhung Anh Huynh; El-Temsah Yehia Sayed Ismail; Hrabák Pavel; Borůvka Martin; Kejzlar Pavel; Bakalova Totka; Ševců Alena
- ItemBehaviour of Ag and Si-graphite nanomaterials in environmental and extreme conditions(2016-01-01) Waclawek Stanislaw; Vellora Thekkae Padil Vinod; Nguyen Nhung Anh Huynh; Calais Jean-François; Ševců Alena; Černík Miroslav
- ItemBiological effects of four iron-containing nanoremediation materials on the green alga Chlamydomonas sp.(Elsevier Inc., 2018-01-01) Nguyen Nhung Anh Huynh; Nadia Moos; Ševců AlenaAs nanoremediation strategies for in-situ groundwater treatment extend beyond nanoiron-based applications to adsorption and oxidation, ecotoxicological evaluations of newly developed materials are required. The biological effects of four new materials with different iron (Fe) speciations ([i] FerMEG12 - pristine flake-like milled Fe(0) nanoparticles (nZVI), [ii] Carbo-Iron® - Fe(0)-nanoclusters containing activated carbon (AC) composite, [iii] Trap-Ox® Fe-BEA35 (Fe-zeolite) - Fe-doped zeolite, and [iv] Nano-Goethite - ‘pure’ FeOOH) were studied using the unicellular green alga Chlamydomonas sp. as a model test system. Algal growth rate, chlorophyll fluorescence, efficiency of photosystem II, membrane integrity and reactive oxygen species (ROS) generation were assessed following exposure to 10, 50 and 500 mg L−1 of the particles for 2 h and 24 h. The particles had a concentration-, material- and time-dependent effect on Chlamydomonas sp., with increased algal growth rate after 24 h. Conversely, significant intracellular ROS levels were detected after 2 h, with much lower levels after 24 h. All Fe-nanomaterials displayed similar Z-average sizes and zeta-potentials at 2 h and 24 h. Effects on Chlamydomonas sp. decreased in the order FerMEG12 > Carbo-Iron® > Fe-zeolite > Nano-Goethite. Ecotoxicological studies were challenged due to some particle properties, i.e. dark colour, effect of constituents and a tendency to agglomerate, especially at high concentrations. All particles exhibited potential to induce significant toxicity at high concentrations (500 mg L−1), though such concentrations would rapidly decrease to mg or µg L−1 in aquatic environments, levels harmless to Chlamydomonas sp. The presented findings contribute to the practical usage of particle-based nanoremediation in environmental restoration.
- ItemComposite yarns with antibacterial nanofibrous sheaths produced by collectorless alternating-current electrospinning for suture applications(Wiley, 2021-01-01) Madheswaran Divyabharathi; Sivan Manikandan; Valtera Jan; Kuželová Košťáková Eva; Egghe Tim; Asadian Mahtab; Novotný Vít; Nguyen Nhung Anh Huynh; Ševců Alena; Morent Rino; Degeyter Nathalie; Lukáš David
- ItemDifferent effects of nano-scale and micro-scale zero-valent iron particles on planktonic microorganisms from natural reservoir water(Royal Society of Chemistry (RSC), 2018-01-01) Nguyen Nhung Anh Huynh; Špánek Roman; Vlková Denisa; Řeháková Hana; Kejzlar Pavel; Ševců Alena
- ItemDiscovering the potential of an nZVI-biochar composite as a material for the nanobioremediation of chlorinated solvents in groundwater: Degradation efficiency and effect on resident microorganisms(Elsevier, 2021-01-01) Semerád Jaroslav; Ševců Alena; Nguyen Nhung Anh Huynh; Hrabák Pavel; Špánek Roman; Bobčíková Kateřina; Pospíšková Kristýna; Filip Jan; Medřík Ivo; Kašlík Josef; Šafařík Ivo; Filipová Alena; Nosek Jaroslav; Pivokonský Martin; Cajthaml Tomáš
- ItemDual-modality self-heating and antibacterial polymer-coated nanoparticles for magnetic hyperthermia(2016-01-01) Darwish Mohamed; Nguyen Nhung Anh Huynh; Ševců Alena; Stibor Ivan; Smoukov Stoyan K.
- ItemECOTOXICITY OF ORGANOMETAL HALIDE PEROVSKITES TESTED ON PSEUDOMONAS PUTIDA(Tanger Ltd., 2016-01-01) Rosická Petra; Nguyen Nhung Anh Huynh; Ševců Alena; Lederer Tomáš; Rysová Miroslava
- ItemEcotoxicity testing and environmental risk assessment of iron nanomaterials for sub-surface remediation – Recommendations from the FP7 project NanoRem(Pergamon Press Ltd., 2017-01-01) Hjorth Rune; Coutris Claire; Nguyen Nhung Anh Huynh; Ševců Alena; Gallego-Urea Julian Alberto; Baun Anders; Joner Erik J.Nanoremediation with iron (Fe) nanomaterials opens new doors for treating contaminated soil and groundwater, but is also accompanied by new potential risks as large quantities of engineered nanomaterials are introduced into the environment. In this study, we have assessed the ecotoxicity of four engineered Fe nanomaterials, specifically, Nano-Goethite, Trap-Ox Fe-zeolites, Carbo-Iron® and FerMEG12, developed within the European FP7 project NanoRem for sub-surface remediation towards a test battery consisting of eight ecotoxicity tests on bacteria (V. fisheri, E. coli), algae (P. subcapitata, Chlamydomonas sp.), crustaceans (D. magna), worms (E. fetida, L. variegatus) and plants (R. sativus, L. multiflorum). The tested materials are commercially available and include Fe oxide and nanoscale zero valent iron (nZVI), but also hybrid products with Fe loaded into a matrix. All but one material, a ball milled nZVI (FerMEG12), showed no toxicity in the test battery when tested in concentrations up to 100 mg/L, which is the cutoff for hazard labeling in chemicals regulation in Europe. However it should be noted that Fe nanomaterials proved challenging to test adequately due to their turbidity, aggregation and sedimentation behavior in aqueous media. This paper provides a number of recommendations concerning future testing of Fe nanomaterials and discusses environmental risk assessment considerations related to these.
- ItemElectrical conductivity and physiological comfort of silver coated cotton fabrics(Taylor & Francis Online, 2017-01-01) Nguyen Nhung Anh Huynh; Ali Azam; Baheti Vijaykumar; Militký Jiří; Mansoor Tariq; Noman Muhammad Tayyab; Ahmad Sheraz; Ashraf MunirThe objective of present study was to develop multifunctional and wearable electrically conductive fabrics with acceptable comfort properties by in-situ deposition of silver particles. The effect of silver nitrate concentration and number of dips was investigated for change in electrical conductivity, EMI shielding, and antimicrobial properties of coated fabrics. The dynamic light scattering and SEM analysis were employed to study the morphology of deposited silver particles. The EMI shielding was found to increase with increase in concentration of silver particles. Later, the comfort and mechanical properties were studied. No significant decrease in air permeability and water vapor permeability was observed due to partial coverage of fabric pores by coating of silver particles. Moreover, the coated fabrics also showed promising behavior toward antimicrobial properties. When the durability of coated fabrics was examined against washing, the application of binder provided good retention of silver particles without loss of electrical conductivity of coated fabrics.
- ItemEnvironmental fate of sulfidated nZVI particles: the interplay of nanoparticle corrosion and toxicity during aging(RCS, 2020-01-01) Ševců Alena; Nguyen Nhung Anh Huynh; Mikšíček Jiří; Lederer Tomáš
- ItemGreen Synthesis of Metal and Metal Oxide Nanoparticles and Their Effect on the Unicellular Alga Chlamydomonas reinhardtii(SPRINGER, 2018-01-01) Nguyen Nhung Anh Huynh; Vellora Thekkae Padil Vinod; Černík Miroslav; Ševců Alena
- ItemImpact of Zero-Valent Iron on Freshwater Bacterioplankton Metabolism as Predicted from 16S rRNA Gene Sequence Libraries(Springer, 2021-01-01) Nguyen Nhung Anh Huynh; Špánek Roman; Falagan -Lotsch Priscila; Ševců Alena
- ItemIn situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities.(Springer Open, 2020-01-01) Czinnerová Marie; Nguyen Nhung Anh Huynh; Němeček Jan; Mackenzie Katrin; Boothman Christopher; Lloyd Jonathan; Laszlo Tamas; Špánek Roman; Černík Miroslav; Ševců Alena
- ItemIn vitro and environmental toxicity of reduced graphene oxide as an additive in automotive lubricants(Royal Society of Chemistry (RSC), 2018-01-01) Nguyen Nhung Anh Huynh; Rosická Petra; Ševců Alena
- ItemMagnetic Poly(N-isopropylacrylamide) Nanocomposites: Effect of Preparation Method on Antibacterial Properties(SPRINGER, 2017-01-01) Nguyen Nhung Anh Huynh; Darwish Mohamed; Stibor Ivan; Kejzlar Pavel; Ševců Alena
- ItemSynthesis, fabrication and antibacterial properties of a plasma modified electrospun membrane consisting of gum Kondagogu, dodecenyl succinic anhydride and poly (vinyl alcohol)(ELSEVIER SCIENCE SA, 2015-01-01) Vellora Thekkae Padil Vinod; Nguyen Nhung Anh Huynh; Rozek Zbigniew; Ševců Alena; Černík Miroslav