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Publications (10 of 192) Show all publications
Bora, T. & Dutta, J. (2019). Plasmonic Photocatalyst Design: Metal-Semiconductor Junction Affecting Photocatalytic Efficiency. Journal of Nanoscience and Nanotechnology, 19(1), 383-388
Open this publication in new window or tab >>Plasmonic Photocatalyst Design: Metal-Semiconductor Junction Affecting Photocatalytic Efficiency
2019 (English)In: Journal of Nanoscience and Nanotechnology, ISSN 1533-4880, E-ISSN 1533-4899, Vol. 19, no 1, p. 383-388Article in journal (Refereed) Published
Abstract [en]

Silver-zinc oxide nanorods (Ag-ZnO NRs) and gold-zinc oxide nanorods (Au-ZnO NRs) plasmonic photocatalysts were fabricated by the deposition of Ag and Au nanoparticles on ZnO NRs. The photocatalysts were studied with electron microscopy, energy dispersive spectroscopy (EDS), UV-vis optical absorption and photoluminescence spectroscopy. The effect of type of metals on the ZnO surface on its photocatalytic activity under ultra violet (UV) as well as visible light excitation are investigated and their contribution towards enhanced photo-generated charge separation in terms of the type of junction (Ohmic or Schottky) the metal forms with the semiconductor are explained.

Place, publisher, year, edition, pages
AMER SCIENTIFIC PUBLISHERS, 2019
Keywords
Plasmonic Photocatalysis, Visible Light Photocatalysis, Metal-Semiconductor Catalyst, Ohmic Contact, Schottky Contact, Photocatalytic Treatment
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-238520 (URN)10.1166/jnn.2019.15785 (DOI)000447641700049 ()
Note

QC 20181106

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-06Bibliographically approved
Laxman, K., Husain, A., Nasser, A., Al Abri, M. & Dutta, J. (2019). Tailoring the pressure drop and fluid distribution of a capacitive deionization device. Desalination, 449, 111-117
Open this publication in new window or tab >>Tailoring the pressure drop and fluid distribution of a capacitive deionization device
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2019 (English)In: Desalination, ISSN 0011-9164, E-ISSN 1873-4464, Vol. 449, p. 111-117Article in journal (Refereed) Published
Abstract [en]

The performance of a capacitive deionization (CDI) device is governed by complex relations between the electrode material properties, fluid velocity and fluid distribution within the device. In order to maximize fluid (water) interaction with the electrodes, the relationships between fluid flow and electrode material properties are explored here to develop novel CDI architectures which reduce the pressure drop, improve surface utilization factor and improve the electrode salt adsorption capacity. Using activated carbon cloth (ACC) as the electrode material, the pressure drop across the CDI device is quantified with respect to flow scheme (flow-between and flow-through CDI modes) used. Computational fluid dynamic (CFD) models are developed to study and optimize the fluid velocity and distribution in order to minimize the device fluid pressure losses. The model predictions are verified by constructing the conceptualized CDI devices and correlating the theoretical and experimentally obtained pressure drops, salt adsorption capacities and fluid flow parameters. The results indicate that up to 60% reduction in pressure drop and similar to 35% increase in specific salt adsorption capacity can be achieved by simple changes to the input-output port architecture of the CDI units. The results describe a method to considerably lower energy consumption in commercial CDI devices.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
Keywords
Capacitive deionization (CDI), Pressure drop, Activated carbon cloth (ACC), Computational fluid dynamics, Fluid distribution
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-239965 (URN)10.1016/j.desal.2018.10.021 (DOI)000451103100012 ()
Funder
Mistra - The Swedish Foundation for Strategic Environmental Research, 2015/31
Note

QC 20181211

Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11Bibliographically approved
Shafiq, M., Laxman, K. & Dutta, J. (2018). Estimation of ion adsorption using iterative analytical model in capacitive deionization process. Desalination and Water Treatment, 116, 75-82
Open this publication in new window or tab >>Estimation of ion adsorption using iterative analytical model in capacitive deionization process
2018 (English)In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 116, p. 75-82Article in journal (Refereed) Published
Abstract [en]

Capacitive deionization (CDI) is an upcoming technique that can replace existing processes for removing and recuperating metal ions from dilute industrial waste waters. CDI removes ions via electrosorption on to its electrode surfaces, the efficiency of which is a function of CDI electrode properties that progressively change during continued operation. As such a need exists to develop a model to predict CDI performance over elongated periods which is independent of electrode properties and has negligible error values. By applying a first order non-linear dynamic model (FONDM) with inputs independent of the electrode characteristics, we propose a universal model that can predict CDI ion adsorption capacity with changes in applied potential, flow rate and electrolyte temperature to within 5% of the experimentally obtained results. The model was verified using activated carbon cloth (ACC) as a test electrode and aqueous sodium chloride solution as electrolyte, with a good prediction for ion electrosorption efficiency and time dependent electrosorption dynamics. The simplicity of the model makes it easy to adapt for various applications and in the development of intelligent control systems for CDI units in practical settings.

Place, publisher, year, edition, pages
Desalination Publ, 2018
Keywords
Activated carbon cloth, Analytical model, Ion adsorption, Capacitive deionization (CDI), Electrosorption
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-235901 (URN)10.5004/dwt.2018.22322 (DOI)000445130100008 ()
Note

QC 20181011

Available from: 2018-10-11 Created: 2018-10-11 Last updated: 2018-10-11Bibliographically approved
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
Loiko, P., Bora, T., Serres, J. M., Yu, H., Aguio, M., Diaz, F., . . . Dutta, J. (2018). Oriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared. Beilstein Journal of Nanotechnology, 9, 2730-2740
Open this publication in new window or tab >>Oriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared
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2018 (English)In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 9, p. 2730-2740Article in journal (Refereed) Published
Abstract [en]

Zinc oxide (ZnO) nanorods (NRs) oriented along the crystallographic [001] axis are grown by the hydrothermal method on glass substrates. The ZnO NRs exhibit a broadband (1-2 mu m) near-IR absorption ascribed to the singly charged zinc vacancy V-z(n)-1. The saturable absorption of the ZnO NRs is studied at approximate to 1 mu m under picosecond excitation, revealing a low saturation intensity, approximate to 10 kW/cm(2), and high fraction of the saturable losses. The ZnO NRs are applied as saturable absorbers in diode-pumped Yb (approximate to 1.03 mu m) and Tm (approximate to 1.94 mu m) lasers generating nanosecond pulses. The ZnO NRs grown on various optical surfaces are promising broadband saturable absorbers for nanosecond near-IR lasers in bulk and waveguide geometries.

Place, publisher, year, edition, pages
BEILSTEIN-INSTITUT, 2018
Keywords
oriented nanorods, Q-switching, saturable absorption, solid-state lasers, zinc oxide
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-238532 (URN)10.3762/bjnano.9.255 (DOI)000448084400001 ()
Note

QC 20181106

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-06Bibliographically approved
Khalid, M., Bora, T., Ghaithi, A. A., Thukral, S. & Dutta, J. (2018). Raman spectroscopy detects changes in bone mineral quality and collagen cross-linkage in staphylococcus infected human bone. Scientific Reports, 8(1), Article ID 9417.
Open this publication in new window or tab >>Raman spectroscopy detects changes in bone mineral quality and collagen cross-linkage in staphylococcus infected human bone
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, no 1, article id 9417Article in journal (Refereed) Published
Abstract [en]

Diagnosis of osteomyelitis presents a formidable challenge. Lack of pathognomonic clinical sign(s) and diagnostic tests that can diagnose osteomyelitis at an early stage contribute to this difficulty. If the diagnosis is not made early, the disease becomes very difficult to eradicate and can lead to limb threatening and potentially life-threatening complications. Staphylococcus aureus is the most common organism causing osteomyelitis. Raman Spectroscopy provides information about molecular vibration that could potentially be harnessed as a spectral signature for cellular changes in specific pathologic conditions. In this study we describe a technique using Raman spectroscopy that could potentially be used to diagnose staphylococcal osteomyelitis. Human bone samples were co-cultured with Staphylococcus aureus (S. aureus) and the effects of bacterial growth on bone quality were then monitored using Raman spectroscopy. A major drop in the bone mineral quality and crystallinity was observed in the infected bones compared to the controls. S. aureus infection was also found to alter the collagen cross-linking. Our study shows that specific spectral signatures are present for the cause as well as the effect of staphylococcal osteomyelitis, opening the possibility of developing a useful diagnostic modality for early and rapid diagnosis of this condition. 

Place, publisher, year, edition, pages
Nature Publishing Group, 2018
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:kth:diva-236580 (URN)10.1038/s41598-018-27752-z (DOI)000435630400022 ()2-s2.0-85048884042 (Scopus ID)
Note

Export Date: 22 October 2018; Article; Correspondence Address: Dutta, J.; Functional Materials, Department of Applied Physics, SCI School, KTH Royal Institute of TechnologySweden; email: joydeep@kth.se. QC 20181126

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-11-26Bibliographically approved
Saoud, K., Al Soubaihi, R. & Dutta, J. (2018). Self-sustaining and hysteresis behavior of low-temperature CO oxidation on mesoporous Pd/SiO2 aerogel s catalyst under dynamics conditions. Paper presented at 256th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nanoscience, Nanotechnology and Beyond, AUG 19-23, 2018, Boston, MA. Abstract of Papers of the American Chemical Society, 256
Open this publication in new window or tab >>Self-sustaining and hysteresis behavior of low-temperature CO oxidation on mesoporous Pd/SiO2 aerogel s catalyst under dynamics conditions
2018 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 256Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-238565 (URN)000447600002055 ()
Conference
256th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nanoscience, Nanotechnology and Beyond, AUG 19-23, 2018, Boston, MA
Note

QC 20181105

Available from: 2018-11-05 Created: 2018-11-05 Last updated: 2018-11-05Bibliographically approved
Al-Sabahi, J., Bora, T., Claereboudt, M., Al-Abri, M. & Dutta, J. (2018). Visible light photocatalytic degradation of HPAM polymer in oil produced water using supported zinc oxide nanorods. Chemical Engineering Journal, 351, 56-64
Open this publication in new window or tab >>Visible light photocatalytic degradation of HPAM polymer in oil produced water using supported zinc oxide nanorods
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2018 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 351, p. 56-64Article in journal (Refereed) Published
Abstract [en]

Polymer flooding displacement ability during petroleum extraction from the earth's crust plays an important role in enhanced oil recovery processes. Produced water, as a byproduct, still contain high concentrations of petroleum hydrocarbons and partially hydrolyzed polyacrylamide (HPAM) which is a serious environmental concern. Remediating produced water economically is a big challenge for meeting the permissible discharge limits leading to failure in the effectiveness of the conventional water treatment technologies. Advanced oxidation processes (AOPs) are playing increasing role in the treatment of polluted water and is receiving much attention in recent times as a green and safer water treatment technology. Here we report a new approach to use vertically aligned zinc oxide nanorods (ZnO NRs) supported on substrates engineered for improving their visible light harvesting capacity for effective solar photocatalytic degradation of HPAM. The viscosity of collected oilfield produced water containing HPAM were found to be reduced dramatically when the samples are photocatalytically degraded using ZnO nanorod catalysts irradiated with simulated solar light showing a reduction of 51% within 6 h. With high pressure liquid chromatography 68, 62, 56 and 45% removal of 25, 50, 100 and 150 ppm HPAM, respectively, was demonstrated. The pH of the solution was observed to move to acidic region due to acetamide, nitrate, propionamide and acetic acid which are the intermediate byproducts formed during degradation as determined by mass spectrometry. Zinc oxide nanorod coatings showed about 74% removal efficiency over 5 cycles with less than 1.2% removal of zinc ions after 6 h of light irradiation.

Place, publisher, year, edition, pages
Elsevier B.V., 2018
Keywords
Enhanced oil recovery, HPAM, Produced water, Solar photocatalysis, Zinc oxide nanorods, Byproducts, Enhanced recovery, High pressure liquid chromatography, II-VI semiconductors, Light, Mass spectrometry, Nanocatalysts, Nanorods, Oil well flooding, Petroleum chemistry, Stripping (removal), Structural geology, Water pollution, Well flooding, Zinc coatings, Zinc oxide, Conventional water treatment, Partially hydrolyzed polyacrylamide, Solar photocatalytic degradation, Water treatment technologies, Water treatment
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-236602 (URN)10.1016/j.cej.2018.06.071 (DOI)000444000000007 ()2-s2.0-85048727613 (Scopus ID)
Note

Export Date: 22 October 2018; Article; CODEN: CMEJA; Correspondence Address: Al-Abri, M.; Department of Petroleum and Chemical Engineering, College of Engineering, Sultan Qaboos University, PO Box 33, PC 123, Oman; email: alabri@squ.edu.om; Funding details: TRC, The Research Council; Funding details: SQU, Sultan Qaboos University; Funding text: Authors would like to thank The Research Council , Oman, for its financial support. We would like to acknowledge College of Science (Department of Chemistry) and College of Engineering (Department of Petroleum and Chemical Engineering), Sultan Qaboos University , Oman for technical support. Furthermore, special thanks to Mr. Kristian Pastor from the University of Novi Sad, Serbia and Mr. Azzan Al-Khadori from Sultan Qaboos University, Oman for discussions and assistance during the course of this work. Appendix A. QC 20181126

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-11-26Bibliographically 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
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0074-3504

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