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Al-Naamani, L., Dutta, J. & Dobretsov, S. (2018). Nanocomposite Zinc Oxide-Chitosan Coatings on Polyethylene Films for Extending Storage Life of Okra (Abelmoschus esculentus). NANOMATERIALS, 8(7), Article ID 479.
Open this publication in new window or tab >>Nanocomposite Zinc Oxide-Chitosan Coatings on Polyethylene Films for Extending Storage Life of Okra (Abelmoschus esculentus)
2018 (English)In: NANOMATERIALS, ISSN 2079-4991, Vol. 8, no 7, article id 479Article in journal (Refereed) Published
Abstract [en]

Efficiency of nanocomposite zinc oxide-chitosan antimicrobial polyethylene packaging films for the preservation of quality of vegetables was studied using okra Abelmoschus esculentus. Low density polyethylene films (LDPE) coated with chitosan-ZnO nanocomposites were used for packaging of okra samples stored at room temperature (25 degrees C). Compared to the control sample (no coating), the total bacterial concentrations in the case of chitosan and nanocomposite coatings were reduced by 53% and 63%, respectively. The nanocomposite coating showed a 2-fold reduction in total fungal concentrations in comparison to the chitosan treated samples. Results demonstrate the effectiveness of the nanocomposite coatings for the reduction of fungal and bacterial growth in the okra samples after 12 storage days. The nanocomposite coatings did not affect the quality attributes of the okra, such as pH, total soluble solids, moisture content, and weight loss. This work demonstrates that the chitosan-ZnO nanocomposite coatings not only maintains the quality of the packed okra but also retards microbial and fungal growth. Thus, chitosan-ZnO nanocomposite coating can be used as a potential coating material for active food packaging applications.

Place, publisher, year, edition, pages
MDPI, 2018
Keywords
ZnO nanoparticle, nanocomposite coating, chitosan, antimicrobial, active food packaging
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-234639 (URN)10.3390/nano8070479 (DOI)000442523100030 ()29966220 (PubMedID)2-s2.0-85049496111 (Scopus ID)
Note

QC 20180911

Available from: 2018-09-12 Created: 2018-09-12 Last updated: 2018-09-12Bibliographically approved
Laxman, K., Kimoto, D., Sahakyan, A. & Dutta, J. (2018). Nanoparticulate Dielectric Overlayer for Enhanced Electric Fields in a Capacitive Deionization Device. ACS Applied Materials and Interfaces, 10(6), 5941-5948
Open this publication in new window or tab >>Nanoparticulate Dielectric Overlayer for Enhanced Electric Fields in a Capacitive Deionization Device
2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 6, p. 5941-5948Article in journal (Refereed) Published
Abstract [en]

The magnitude and distribution of the electric field between two conducting electrodes of a capacitive deionization (CDI) device plays an important role in governing the desalting capacity. A dielectric coating on these electrodes can polarize under an applied potential to modulate the net electric field and hence the salt adsorption capacity of the device. Using finite element models, we show the extent and nature of electric field modulation, associated with changes in the size, thickness, and permittivity of commonly used nanostructured dielectric coatings such as zinc oxide (ZnO) and titanium dioxide (TiO2). Experimental data pertaining to the simulation are obtained by coating activated carbon cloth (ACC) with nanoparticles of ZnO and TiO2 and using them as electrodes in a CDI device. The dielectric-coated electrodes displayed faster desalting kinetics of 1.7 and 1.55 mg g(-1) min(-1) and higher unsaturated specific salt adsorption capacities of 5.72 and 5.3 mg g(-1) for ZnO and TiO2, respectively. In contrast, uncoated ACC had a salt adsorption rate and capacity of 1.05 mg g(-1) min(-1) and 3.95 mg g(-1), respectively. The desalting data is analyzed with respect to the electrical parameters of the electrodes extracted from cyclic voltammetry and impedance measurements. Additionally, the obtained results are correlated with the simulation data to ascertain the governing principles for the changes observed and advances that can be achieved through dielectric-based electrode modifications for enhancing the CDI device performance.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
Keywords
dielectric polarization, capacitive deionization, electric field, zinc oxide, titanium dioxide
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-224027 (URN)10.1021/acsami.7b16540 (DOI)000425572700090 ()29369615 (PubMedID)2-s2.0-85042051819 (Scopus ID)
Note

QC 20180323

Available from: 2018-03-23 Created: 2018-03-23 Last updated: 2018-03-23Bibliographically approved
Al-Hinai, M. H., Sathe, P., Al-Abri, M. Z., Dobretsov, S., Al-Hinai, A. T. & Dutta, J. (2017). Antimicrobial Activity Enhancement of Poly(ether sulfone) Membranes by in Situ Growth of ZnO Nanorods. ACS OMEGA, 2(7), 3157-3167
Open this publication in new window or tab >>Antimicrobial Activity Enhancement of Poly(ether sulfone) Membranes by in Situ Growth of ZnO Nanorods
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2017 (English)In: ACS OMEGA, ISSN 2470-1343, Vol. 2, no 7, p. 3157-3167Article in journal (Refereed) Published
Abstract [en]

Composite poly(ether sulfone) membranes integrated with ZnO nanostructures either directly blended or grown in situ have enhanced antibacterial activity with improved functionality in reducing the biofouling in water treatment applications. The pore structure and surface properties of the composite were studied to investigate the effect of the addition of ZnO nanostructures. The hydrophilicity of the blended membranes increased with a higher content of ZnO nanoparticles in the membrane (2-6%), which could be further controlled by varying the growth conditions of ZnO nanorods on the polymer surface. Improved water flux, bovine serum albumin rejection, and inhibition of Escherichia coli bacterial growth under visible light irradiation was observed for the membranes decorated with ZnO nanorods compared to those in the membranes simply blended with ZnO nanoparticles. No regrowth of E. coli was recorded even 2 days after the incubation.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2017
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-214902 (URN)10.1021/acsomega.7b00314 (DOI)000409909900009 ()2-s2.0-85028918153 (Scopus ID)
Note

QC 20171023

Available from: 2017-10-23 Created: 2017-10-23 Last updated: 2017-10-23Bibliographically approved
Al-Naamani, L., Dobretsov, S., Dutta, J. & Burgess, J. G. (2017). Chitosan-zinc oxide nanocomposite coatings for the prevention of marine biofouling. Chemosphere, 168, 408-417
Open this publication in new window or tab >>Chitosan-zinc oxide nanocomposite coatings for the prevention of marine biofouling
2017 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 168, p. 408-417Article in journal (Refereed) Published
Abstract [en]

Marine biofouling is a worldwide problem affecting maritime industries. Global concerns about the high toxicity of antifouling paints have highlighted the need to develop less toxic antifouling coatings. Chitosan is a natural polymer with antimicrobial, antifungal and antialgal properties that is obtained from partial deacetylation of crustacean waste. In the present study, nanocomposite chitosan-zinc oxide (chitosan-ZnO) nanoparticle hybrid coatings were developed and their antifouling activity was tested. Chitosan-ZnO nanoparticle coatings showed anti-diatom activity against Navicula sp. and antibacterial activity against the marine bacterium Pseudoalteromonas nigrifaciens. Additional antifouling properties of the coatings were investigated in a mesocosm study using tanks containing natural sea water under controlled laboratory conditions. Each week for four weeks, biofilm was removed and analysed by flow cytometry to estimate total bacterial densities on the coated substrates. Chitosan-ZnO hybrid coatings led to better inhibition of bacterial growth in comparison to chitosan coatings alone, as determined by flow cytometry. This study demonstrates the antifouling potential of chitosan-ZnO nanocomposite hybrid coatings, which can be used for the prevention of biofouling. (C) 2016 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Antifouling, Chitosan, ZnO nanoparticles, Nanocomposite coating, Biofilm
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-201222 (URN)10.1016/j.chemosphere.2016.10.033 (DOI)000391897500049 ()2-s2.0-84993978154 (Scopus ID)
Note

QC 20170222

Available from: 2017-02-20 Created: 2017-02-20 Last updated: 2017-11-29Bibliographically approved
Al-Sabahi, J., Bora, T., Al-Abri, M. & Dutta, J. (2017). Efficient visible light photocatalysis of benzene, toluene, ethylbenzene and xylene (BTEX) in aqueous solutions using supported zinc oxide nanorods. PLoS ONE, 12(12), Article ID e0189276.
Open this publication in new window or tab >>Efficient visible light photocatalysis of benzene, toluene, ethylbenzene and xylene (BTEX) in aqueous solutions using supported zinc oxide nanorods
2017 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, no 12, article id e0189276Article in journal (Refereed) Published
Abstract [en]

Benzene, toluene, ethylbenzene and xylenes (BTEX) are some of the common environmental pollutants originating mainly from oil and gas industries, which are toxic to human as well as other living organisms in the ecosystem. Here we investigate photocatalytic degradation of BTEX under visible light irradiation using supported zinc oxide (ZnO) nanorods grown on glass substrates using a microwave assisted hydrothermal method. ZnO nanorods were characterized by electron microscopy, X-ray diffraction (XRD), specific surface area, UV/visible absorption and photoluminescence spectroscopy. Visible light photocatalytic degradation products of BTEX are studied for individual components using gas chromatograph/mass spectrometer (GC/MS). ZnO nanorods with significant amount of electronic defect states, due to the fast crystallization of the nanorods under microwave irradiation, exhibited efficient degradation of BTEX under visible light, degrading more than 80% of the individual BTEX components in 180 minutes. Effect of initial concentration of BTEX as individual components is also probed and the photocatalytic activity of the ZnO nanorods in different conditions is explored. Formation of intermediate byproducts such as phenol, benzyl alcohol, benzaldehyde and benzoic acid were confirmed by our HPLC analysis which could be due to the photocatalytic degradation of BTEX. Carbon dioxide was evaluated and showed an increasing pattern over time indicating the mineralization process confirming the conversion of toxic organic compounds into benign products.

Place, publisher, year, edition, pages
PUBLIC LIBRARY SCIENCE, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-221867 (URN)10.1371/journal.pone.0189276 (DOI)000418564200040 ()29261711 (PubMedID)2-s2.0-85038818106 (Scopus ID)
Note

QC 20180130

Available from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-01-30Bibliographically approved
Nikkam, N., Toprak, M., Dutta, J., Al-Abri, M., Myint, M. T., Souayeh, M. & Mohseni, S. M. (2017). Fabrication and thermo-physical properties characterization of ethylene glycol-MoS2 heat exchange fluids. International Communications in Heat and Mass Transfer, 89, 185-189
Open this publication in new window or tab >>Fabrication and thermo-physical properties characterization of ethylene glycol-MoS2 heat exchange fluids
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2017 (English)In: International Communications in Heat and Mass Transfer, ISSN 0735-1933, E-ISSN 1879-0178, Vol. 89, p. 185-189Article in journal (Refereed) Published
Abstract [en]

This study reports on the fabrication and thermo-physical properties evaluation of ethylene glycol (EG) based heat exchange fluids containing molybdenum disulfide nanoparticles (MoS2 NPs) and micrometer sized particles (MPs). For this purpose, MoS2 NPs and MPs (with average size of 90 nm and 1.2 mu m; respectively) were dispersed and stabilized in EG with particle loading of 0.25, 0.5, 1 wt%. To study the real effect of MoS2 NP/MP the use of surfactants was avoided and ultrasonic agitation was used for dispersion and preparation of stable MoS2 NFs/MFs. The objectives were investigation of impact of MoS2 particle size (including NP/MP) and particle loading on thermo-physical properties of EG based MoS2 NFs/MFs including thermal conductivity (TC) and viscosity of NFs/MFs at 20 degrees C. All suspensions (NFs/MFs) exhibited a higher TC than the EG as base liquid and NFs showed higher TC enhancement values than the MFs. A TC enhancement of 16.4% was observed for NFs containing 1 wt % MoS2 NPs while the maximum increase in viscosity of 9.7% was obtained for the same NF at 20 degrees C. It indicates this NF system may have some potential to be utilized in heat transfer applications.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2017
Keywords
MoS2 nanoparticles, MoS2 microparticles, Nanofluids, Microfluids thermal conductivity, Viscosity, Thermo-physical property
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-221874 (URN)10.1016/j.icheatmasstransfer.2017.10.011 (DOI)000419412500021 ()
Note

QC 20180131

Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-01-31Bibliographically approved
Kyaw, H. H., Myint, M. T., Al-Harthi, S. H., Maekawa, T., Yanagisawa, K., Sellai, A. & Dutta, J. (2017). Observation of exchanging role of gold and silver nanoparticles in bimetallic thin film upon annealing above the glass transition temperature. MATERIALS RESEARCH EXPRESS, 4(8), Article ID 086409.
Open this publication in new window or tab >>Observation of exchanging role of gold and silver nanoparticles in bimetallic thin film upon annealing above the glass transition temperature
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2017 (English)In: MATERIALS RESEARCH EXPRESS, ISSN 2053-1591, Vol. 4, no 8, article id 086409Article in journal (Refereed) Published
Abstract [en]

The exchange role of gold (Au) and silver (Ag) in bimetallic films co-evaporated onto soda-lime glass substrates with Au-Ag volume ratios of 1:2, 1:1 and 2:1 have been demonstrated. Annealing of the films above the glass transition temperature in air led to non-alloying nature of the films, silver neutrals (Ag-0) and gold nanoparticles (AuNPs) on the surface, along with silver nanoparticles (AgNPs) inside the glass matrix. Moreover, the size distribution and interparticle spacing of the AuNPs on the surface were governed by the Ag content in the deposited film. In contrast, the content of Au in the film played an opposite role leading to the migration of Ag ions (i.e. Ag-0 being transformed to Ag ions after annealing in oxygen ambient) to form AgNPs inside the glass matrix. The higher the Au content in the film is, the more likely Ag-0 to stay on the surface and impacts on the size distribution of AuNPs and consequently on the refractive index sensitivity measurements. Experimental realisation of this fact was reflected from the best performance for localized surface plasmon resonance (LSPR) sensitivity test achieved with Au-Ag ratio of 1:2. The Au/Ag/glass bimetallic dynamic results of this study can be pertinent to sensor applications integrated with optical devices.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2017
Keywords
gold-silver bimetallic nanoparticles, film, nanoparticle surface, nanocomposites, annealing, refractive index sensitivity
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-214343 (URN)10.1088/2053-1591/aa84e6 (DOI)000407979700003 ()2-s2.0-85029174380 (Scopus ID)
Note

QC 20170912

Available from: 2017-09-12 Created: 2017-09-12 Last updated: 2018-09-19Bibliographically approved
Loiko, P., Bora, T., Maria Serres, J., Mateos, X., Yu, H., Baranov, A., . . . Dutta, J. (2017). Oriented ZnO Nanorods: A Novel Saturable Absorber for Lasers at 1-2 mu m. In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC): . Paper presented at 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC). IEEE
Open this publication in new window or tab >>Oriented ZnO Nanorods: A Novel Saturable Absorber for Lasers at 1-2 mu m
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2017 (English)In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC), IEEE , 2017Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IEEE, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-230870 (URN)000432564600389 ()
Conference
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
Note

QC 20180618

Available from: 2018-06-18 Created: 2018-06-18 Last updated: 2018-06-18Bibliographically approved
Ashour, R. M., Abdelhamid, H. N., Abdel-Magied, A. F., Abdel-Khalek, A. A., Ali, M. M., Uheida, A., . . . Dutta, J. (2017). Rare Earth Ions Adsorption onto Graphene Oxide Nanosheets. Solvent extraction and ion exchange, 35(2), 91-103
Open this publication in new window or tab >>Rare Earth Ions Adsorption onto Graphene Oxide Nanosheets
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2017 (English)In: Solvent extraction and ion exchange, ISSN 0736-6299, E-ISSN 1532-2262, Vol. 35, no 2, p. 91-103Article in journal (Refereed) Published
Abstract [en]

Graphene oxide (GO) was synthesized and used as a coagulant of rare earth elements (REEs) from aqueous solution. Stability and adsorption capacities were exhibited for target REEs such as La(III), Nd(III), Gd(III), and Y(III). The parameters influencing the adsorption capacity of the target species including contact time, pH, initial concentration, and temperature were optimized. The adsorption kinetics and thermodynamics were studied. The method showed quantitative recovery (99%) upon desorption using HNO3 acid (0.1 M) after a short contact time (15 min).

Place, publisher, year, edition, pages
Taylor & Francis, 2017
Keywords
Adsorption, desorption, rare earth, graphene oxide
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-207923 (URN)10.1080/07366299.2017.1287509 (DOI)000400509800002 ()2-s2.0-85014556348 (Scopus ID)
Note

QC 20170529

Available from: 2017-05-29 Created: 2017-05-29 Last updated: 2017-05-29Bibliographically approved
Alsharaeh, E. H., Bora, T., Soliman, A., Ahmed, F., Bharath, G., Ghoniem, M. G., . . . Dutta, J. (2017). Sol-Gel-Assisted Microwave-Derived Synthesis of Anatase Ag/TiO2/GO Nanohybrids toward Efficient Visible Light Phenol Degradation. CATALYSTS, 7(5), Article ID 133.
Open this publication in new window or tab >>Sol-Gel-Assisted Microwave-Derived Synthesis of Anatase Ag/TiO2/GO Nanohybrids toward Efficient Visible Light Phenol Degradation
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2017 (English)In: CATALYSTS, ISSN 2073-4344, Vol. 7, no 5, article id 133Article in journal (Refereed) Published
Abstract [en]

A simple microwave-assisted (MWI) wet chemical route to synthesize pure anatase phase titanium dioxide (TiO2) nanoparticles (NPs) is reported here using titanium tetrachloride (TiCl4) as starting material. The as-prepared TiO2 NPs were characterized by electron microscopy, X-ray diffraction, UV/visible absorption spectroscopy, and infrared and Raman spectroscopic techniques. Further modification of the anatase TiO2 NPs was carried out by incorporating plasmonic silver (Ag) NPs and graphene oxide (GO) in order to enhance the visible light absorption. The photocatalytic activities of the anatase TiO2, Ag/TiO2, and Ag/TiO2/GO nanocomposites were evaluated under both ultraviolet (UV) and visible light irradiation using phenol as a model contaminant. The presence of Ag NPs was found to play a significant role to define the photocatalytic activity of the Ag/TiO2/GO nanocomposite. It was found that the Ag performed like a sink under UV excitation and stored photo-generated electrons from TiO2, whereas, under visible light excitation, the Ag acted as a photosensitizer enhancing the photocatalytic activity of the nanocomposite. The detailed mechanism was studied based on photocatalytic activities of Ag/TiO2/GO nanocomposites. Therefore, the as-prepared Ag/TiO2/GO nanocomposite was used as photocatalytic materials under both UV and visible light irradiation toward degradation of organic molecules.

Place, publisher, year, edition, pages
MDPI AG, 2017
Keywords
TiO2, graphene oxide, XRD, photocatalysts
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-211411 (URN)10.3390/catal7050133 (DOI)000404099100008 ()2-s2.0-85019026282 (Scopus ID)
Note

QC 20170803

Available from: 2017-08-03 Created: 2017-08-03 Last updated: 2017-08-03Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0074-3504

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