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Maiti S, Senavirathna LN, Minguez Bacho I, Menath J, Gruber W, Vogel N, Bachmann J, Unruh T. Highly Ordered Monolayers of μm-Sized Polystyrene Spheres Studied by Grazing-Incidence Small-Angle X-ray Scattering, Simulations, and Geometrical Calculations. Langmuir 2024; 40:1185-1194. [PMID: 38166415 DOI: 10.1021/acs.langmuir.3c02219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Unraveling the two-dimensional (2D) structural ordering of colloidal particles assembled at a flat surface is essential for understanding and optimizing their physical properties. So far, grazing-incidence small-angle X-ray scattering (GISAXS) has been widely used to determine crystallographic information on 2D self-assembled structures of nanosize objects. However, solving the structure of 2D lattices consisting of micrometer (μm)-sized objects still remains a challenge using scattering methods. Here, a model 2D SCALMS (supported catalytically active liquid metal solution) template is fabricated from μm-sized polystyrene (PS) spheres that form a monolayer on top of the flat solid support. GISAXS patterns of the sample were collected for rotation angles around its surface normal in steps of 3°. For every rotation angle, different Bragg-type interference maxima along the out-of-plane (qz) direction were observed. On the basis of simulations of GISXAS patterns of single domains of ordered particle arrangements using the distorted wave Born approximation (DWBA) and validation against a simple geometrical scattering model, the interference maxima could nicely be interpreted to originate from a monolayer of the μm-sized spherical particles which are arranged in domains of hexagonal 2D paracrystalline order. This novel GISAXS evaluation technique serves as a proof of principle for determining the μm-size periodicity of 2D crystalline domains and demonstrates its potential to spatially resolve the relative orientations of such domains with respect to a reference direction.
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Affiliation(s)
- S Maiti
- Institute for Crystallography and Structural Physics, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudstr. 3, 91058 Erlangen, Germany
| | - L N Senavirathna
- Institute for Crystallography and Structural Physics, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudstr. 3, 91058 Erlangen, Germany
| | - I Minguez Bacho
- Chemistry of Thin Film Materials, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstr. 3, 91058 Erlangen, Germany
| | - J Menath
- Institute of Particle Technology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - W Gruber
- Institute for Crystallography and Structural Physics, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudstr. 3, 91058 Erlangen, Germany
| | - N Vogel
- Institute of Particle Technology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany
| | - J Bachmann
- Chemistry of Thin Film Materials, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstr. 3, 91058 Erlangen, Germany
| | - T Unruh
- Institute for Crystallography and Structural Physics, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudstr. 3, 91058 Erlangen, Germany
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Maiti S, Sclar H, Grinblat J, Talianker M, Elias Y, Wu X, Kondrakov A, Aurbach D. Stabilizing High-Voltage LiNi 0.5 Mn 1.5 O 4 Cathodes for High Energy Rechargeable Li Batteries by Coating With Organic Aromatic Acids and Their Li Salts. Small Methods 2022; 6:e2200674. [PMID: 36074984 DOI: 10.1002/smtd.202200674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/21/2022] [Indexed: 06/15/2023]
Abstract
Here, three types of surface coatings based on adsorption of organic aromatic acids or their Li salts are applied as functional coating substrates to engineer the surface properties of high voltage LiNi0.5 Mn1.5 O4 (LNMO) spinel cathodes. The materials used as coating include 1,3,5-benzene-tricarboxylic acid (trimesic acid [TMA]), its Li-salt, and 1,4-benzene-dicarboxylic acid (terephthalic acid). The surface coating involves simple ethanol liquid-phase mixing and low-temperature heat treatment under nitrogen flow. In typical comparative studies, TMA-coated (3-5%) LNMO cathodes deliver >90% capacity retention after 400 cycles with significantly improved rate performance in Li-coin cells at 30 °C compared to uncoated material with capacity retention of ≈40%. The cathode coating also prevents the rapid drop in the electrochemical activity of high voltage Li cells at 55 °C. Studies of high voltage full cells containing TMA coated cathodes versus graphite anodes also demonstrate improved electrochemical behavior, including improved cycling performance and capacity retention, increased rate capabilities, lower voltage hysteresis, and very minor direct current internal resistance evolution. In line with the highly positive effects on the electrochemical performance, it is found that these coatings reduce detrimental transition metal cations dissolution and ensure structural stability during prolonged cycling and thermal stability at elevated temperatures.
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Affiliation(s)
- Sandipan Maiti
- Department of Chemistry and Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Hadar Sclar
- Department of Chemistry and Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Judith Grinblat
- Department of Chemistry and Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Michael Talianker
- Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
| | - Yuval Elias
- Department of Chemistry and Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Xiaohan Wu
- BASF SE, 67063, Ludwigshafen am Rhein, Germany
| | | | - Doron Aurbach
- Department of Chemistry and Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan, 5290002, Israel
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Saha A, Taragin S, Maiti S, Kravchuk T, Leifer N, Tkachev M, Noked M. Improved Cycling Stability of LiNi 0.8 Co 0.1 Mn 0.1 O 2 Cathode Material via Variable Temperature Atomic Surface Reduction with Diethyl Zinc. Small 2022; 18:e2104625. [PMID: 34882972 DOI: 10.1002/smll.202104625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 10/29/2021] [Indexed: 06/13/2023]
Abstract
High-Ni-rich layered oxides [e.g., LiNix Coy Mnz O2 ; x > 0.5, x + y + z = 1] are considered one of the most promising cathodes for high-energy-density lithium-ion batteries (LIB). However, extreme electrode-electrolyte reactions, several interfacial issues, and structural instability restrict their practical applicability. Here, a shortened unconventional atomic surface reduction (ASR) technique is demonstrated on the cathode surface as a derivative of the conventional atomic layer deposition (ALD) process, which brings superior cell performances. The atomic surface reaction (reduction process) between diethyl-zinc (as a single precursor) and Ni-rich NMC cathode [LiNi0.8 Co0.1 Mn0.1 O2 ; NCM811] material is carried out using the ALD reactor at different temperatures. The temperature dependency of the process through advanced spectroscopy and microscopy studies is demonstrated and it is shown that thin surface film is formed at 100 °C, whereas at 200 °C a gradual atomic diffusion of Zn ions from the surface to the near-surface regions is taking place. This unique near-surface penetration of Zn ions significantly improves the electrochemical performance of the NCM811 cathode. This approach paves the way for utilizing vapor phase deposition processes to achieve both surface coatings and near-surface doping in a single reactor to stabilize high-energy cathode materials.
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Affiliation(s)
- Arka Saha
- Department of Chemistry, Bar Ilan University, Ramat Gan, Israel
- Bar-Ilan Institute of Nanotechnology and Advanced Materials, Ramat Gan, Israel
| | - Sarah Taragin
- Department of Chemistry, Bar Ilan University, Ramat Gan, Israel
- Bar-Ilan Institute of Nanotechnology and Advanced Materials, Ramat Gan, Israel
| | - Sandipan Maiti
- Department of Chemistry, Bar Ilan University, Ramat Gan, Israel
- Bar-Ilan Institute of Nanotechnology and Advanced Materials, Ramat Gan, Israel
| | - Tatyana Kravchuk
- Surface Science Laboratory of Solid State Institute, Technion - Israel Institute of Technology, Haifa, 5290002, Israel
| | - Nicole Leifer
- Department of Chemistry, Bar Ilan University, Ramat Gan, Israel
- Bar-Ilan Institute of Nanotechnology and Advanced Materials, Ramat Gan, Israel
| | - Maria Tkachev
- Department of Chemistry, Bar Ilan University, Ramat Gan, Israel
- Bar-Ilan Institute of Nanotechnology and Advanced Materials, Ramat Gan, Israel
| | - Malachi Noked
- Department of Chemistry, Bar Ilan University, Ramat Gan, Israel
- Bar-Ilan Institute of Nanotechnology and Advanced Materials, Ramat Gan, Israel
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Chakraverty S, Maiti S. Gershgorin disk theorem in complex interval matrices. PEAS 2022. [DOI: 10.3176/proc.2022.1.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Maiti S, Subramanyam R. Mining co-location patterns from distributed spatial data. Journal of King Saud University - Computer and Information Sciences 2021. [DOI: 10.1016/j.jksuci.2018.08.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Levartovsky Y, Chakraborty A, Kunnikuruvan S, Maiti S, Grinblat J, Talianker M, Major DT, Aurbach D. Enhancement of Structural, Electrochemical, and Thermal Properties of High-Energy Density Ni-Rich LiNi 0.85Co 0.1Mn 0.05O 2 Cathode Materials for Li-Ion Batteries by Niobium Doping. ACS Appl Mater Interfaces 2021; 13:34145-34156. [PMID: 34256562 DOI: 10.1021/acsami.1c06839] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Ni-rich layered oxide LiNi1 - x - yCoxMnyO2 (1 - x - y > 0.5) materials are favorable cathode materials in advanced Li-ion batteries for electromobility applications because of their high initial discharge capacity. However, they suffer from poor cycling stability because of the formation of cracks in their particles during operation. Here, we present improved structural stability, electrochemical performance, and thermal durability of LiNi0.85Co0.1Mn0.05O2(NCM85). The Nb-doped cathode material, Li(Ni0.85Co0.1Mn0.05)0.997Nb0.003O2, has enhanced cycling stability at different temperatures, outstanding capacity retention, improved performance at high discharge rates, and a better thermal stability compared to the undoped cathode material. The high electrochemical performance of the doped material is directly related to the structural stability of the cathode particles. We further propose that Nb-doping in NCM85 improves material stability because of partial reduction of the amount of Jahn-Teller active Ni3+ ions and formation of strong bonds between the dopant and the oxygen ions, based on density functional theory calculations. Structural studies of the cycled cathodes reveal that doping with niobium suppresses the formation of cracks during cycling, which are abundant in the undoped cycled material particles. The Nb-doped NCM85 cathode material also displayed superior thermal characteristics. The coherence between the improved electrochemical, structural, and thermal properties of the doped material is discussed and emphasized.
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Affiliation(s)
- Yehonatan Levartovsky
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Arup Chakraborty
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Sooraj Kunnikuruvan
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Sandipan Maiti
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Judith Grinblat
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Michael Talianker
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Dan Thomas Major
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Doron Aurbach
- Department of Chemistry and Institute for Nanotechnology & Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
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Majee S, Maiti S, Shit GC, Maiti DK. Spatio-temporal evolution of magnetohydrodynamic blood flow and heat dynamics through a porous medium in a wavy-walled artery. Comput Biol Med 2021; 135:104595. [PMID: 34216890 DOI: 10.1016/j.compbiomed.2021.104595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/17/2021] [Accepted: 06/17/2021] [Indexed: 01/30/2023]
Abstract
BACKGROUND AND OBJECTIVE In a healthy body, the elastic wall of the arteries forms wave-like structures resulting from the continuous pumping of the heart. The systolic and diastolic phases generate a contraction and expansion pattern, which is mimicked in this study by considering a wavy-walled arterial structure. A numerical investigation of the spatio-temporal flow of blood and heat transfer through a porous medium under the action of magnetic field strength is conducted. METHOD The governing equations of the blood flow in the Darcy model are simulated by applying a vorticity-stream function formulation approach. The transformed dimensionless equations are further discretized using the finite difference method by developing the Peaceman-Rachford alternating direction implicit (P-R ADI) scheme. RESULTS The computational results for the axial velocity, temperature distribution, flow visualization using the streamlines and vorticity contours, isotherms, wall shear stress and the average Nusselt number are presented graphically for different values of the physical parameters. CONCLUSIONS The study shows that the axial velocity increases with an increase in the Darcy number, and a similar phenomenon is observed because of an amplitude variation in the wavy wall. Both temperature and wall shear stress decreases with an increase in the Darcy number. The average Nusselt number increases with the magnetic field strength, while it has a reducing tendency due to the permeability of the porous medium.
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Affiliation(s)
- S Majee
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - S Maiti
- Department of Mathematics, Jadavpur University, Kolkata, 700032, India
| | - G C Shit
- Department of Mathematics, Jadavpur University, Kolkata, 700032, India.
| | - D K Maiti
- Department of Applied Mathematics with Oceanology and Computer Programming, Vidyasagar University, Medinipur, West Bengal, 721102, India
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Susai FA, Kovacheva D, Kravchuk T, Kauffmann Y, Maiti S, Chakraborty A, Kunnikuruvan S, Talianker M, Sclar H, Fleger Y, Markovsky B, Aurbach D. Studies of Nickel-Rich LiNi 0.85Co 0.10Mn 0.05O 2 Cathode Materials Doped with Molybdenum Ions for Lithium-Ion Batteries. Materials (Basel) 2021; 14:2070. [PMID: 33924057 PMCID: PMC8074102 DOI: 10.3390/ma14082070] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/07/2021] [Accepted: 04/16/2021] [Indexed: 11/17/2022]
Abstract
In this work, we continued our systematic investigations on synthesis, structural studies, and electrochemical behavior of Ni-rich materials Li[NixCoyMnz]O2 (x + y + z = 1; x ≥ 0.8) for advanced lithium-ion batteries (LIBs). We focused, herein, on LiNi0.85Co0.10Mn0.05O2 (NCM85) and demonstrated that doping this material with high-charge cation Mo6+ (1 at. %, by a minor nickel substitution) results in substantially stable cycling performance, increased rate capability, lowering of the voltage hysteresis, and impedance in Li-cells with EC-EMC/LiPF6 solutions. Incorporation of Mo-dopant into the NCM85 structure was carried out by in-situ approach, upon the synthesis using ammonium molybdate as the precursor. From X-ray diffraction studies and based on our previous investigation of Mo-doped NCM523 and Ni-rich NCM811 materials, it was revealed that Mo6+ preferably substitutes Ni residing either in 3a or 3b sites. We correlated the improved behavior of the doped NCM85 electrode materials in Li-cells with a partial Mo segregation at the surface and at the grain boundaries, a tendency established previously in our lab for the other members of the Li[NixCoyMnz]O2 family.
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Affiliation(s)
- Francis Amalraj Susai
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
| | - Daniela Kovacheva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;
| | - Tatyana Kravchuk
- Solid State Institute, Technion—Israel Institute of Technology, Haifa 32000, Israel;
| | - Yaron Kauffmann
- Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel;
| | - Sandipan Maiti
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
| | - Arup Chakraborty
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
| | - Sooraj Kunnikuruvan
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
| | - Michael Talianker
- Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;
| | - Hadar Sclar
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
| | - Yafit Fleger
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
| | - Boris Markovsky
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
| | - Doron Aurbach
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel; (F.A.S.); (S.M.); (A.C.); (S.K.); (H.S.); (Y.F.)
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Fortunato RN, Robertson AM, Sang C, Duan X, Maiti S. Effect of macro-calcification on the failure mechanics of intracranial aneurysmal wall tissue. Exp Mech 2021; 61:5-18. [PMID: 33776069 PMCID: PMC7992055 DOI: 10.1007/s11340-020-00657-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 07/16/2020] [Accepted: 08/05/2020] [Indexed: 06/12/2023]
Abstract
BACKGROUND Calcification was recently found to be present in the majority of cerebral aneurysms, though how calcification and the presence or absence of co-localized lipid pools affect failure properties is still unknown. OBJECTIVE The primary objective is to quantify the biomechanical effect of a macro-calcification with surrounding Near-Calcification Region (NCR) of varying mechanical properties on tissue failure behavior. METHODS We utilized a structurally informed finite element model to simulate pre-failure and failure behavior of a human cerebral tissue specimen modeled as a composite containing a macro-calcification and surrounding NCR, embedded in a fiber matrix composite. Data from multiple imaging modalities was combined to quantify the collagen organization and calcification geometry. An idealized parametric model utilizing the calibrated model was used to explore the impact of NCR properties on tissue failure. RESULTS Compared to tissue without calcification, peak stress was reduced by 82% and 49% for low modulus (representing lipid pool) and high modulus (simulating increase in calcification size) of the NCR, respectively. Failure process strongly depended on NCR properties with lipid pools blunting the onset of complete failure. When the NCR was calcified, the sample was able to sustain larger overall stress, however the failure process was abrupt with nearly simultaneous failure of the loaded fibers. CONCLUSIONS Failure of calcified vascular tissue is strongly influenced by the ultrastructure in the vicinity of the calcification. Computational modeling of failure in fibrous soft tissues can be used to understand how pathological changes impact the tissue failure process, with potentially important clinical implications.
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Affiliation(s)
- R. N. Fortunato
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh Pittsburgh, USA
| | - A. M. Robertson
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh Pittsburgh, USA
- Department of Bioengineering, University of Pittsburgh Pittsburgh, USA
| | - C. Sang
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh Pittsburgh, USA
| | - X. Duan
- Intelligent Automation Group, PNC Bank, University of Pittsburgh Pittsburgh, USA
| | - S. Maiti
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh Pittsburgh, USA
- Department of Bioengineering, University of Pittsburgh Pittsburgh, USA
- Department of Chemical and Petroleum Engineering, University of Pittsburgh Pittsburgh, USA
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Saha S, Jana P, Ghosh T, Mandal R, Maiti S, Karmakar S, Dey B, Boda S. Immunostimulatory Potency Developed in Pangasianodon hypopthalmus Against Aeromonas hydrophile Through Ocimum sanctum Supplemented Diet. ANIM NUTR FEED TECHN 2021. [DOI: 10.5958/0974-181x.2021.00011.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Maiti S, Sclar H, Grinblat J, Talianker M, Burstein L, Noked M, Markovsky B, Aurbach D. Modification of Li- and Mn-Rich Cathode Materials via Formation of the Rock-Salt and Spinel Surface Layers for Steady and High-Rate Electrochemical Performances. ACS Appl Mater Interfaces 2020; 12:32698-32711. [PMID: 32660233 DOI: 10.1021/acsami.0c07497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We demonstrate a novel surface modification of Li- and Mn-rich cathode materials 0.33Li2MnO3·0.67LiNi0.4Co0.2Mn0.4O2 for lithium-ion batteries (high-energy Ni-Co-Mn oxides, HE-NCM) via their heat treatment with trimesic acid (TA) or terephthalic acid at 600 °C under argon. We established the optimal regimes of the treatment-the amounts of HE-NCM, acid, temperature, and time-resulting in a significant improvement of the electrochemical behavior of cathodes in Li cells. It was shown that upon treatment, some lithium is leached out from the surface, leading to the formation of a surface layer comprising rock-salt-like phase Li0.4Ni1.6O2. The analysis of the structural and surface studies by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy confirmed the formation of the above surface layer. We discuss the possible reactions of HE-NCM with the acids and the mechanism of the formation of the new phases, Li0.4Ni1.6O2 and spinel. The electrochemical characterizations were performed by testing the materials versus Li anodes at 30 °C. Importantly, the electrochemical results disclose significantly improved cycling stability (much lower capacity fading) and high-rate performance for the treated materials compared to the untreated ones. We established a lower evolution of the voltage hysteresis with cycling for the treated cathodes compared to that for the untreated ones. Thermal studies by differential scanning calorimetry also demonstrated lower (by ∼32%) total heat released in the reactions of the materials treated with fluoroethylene carbonate (FEC)-dimethyl carbonate (DEC)/LiPF6 electrolyte solutions, thus implying their significant surface stabilization because of the surface treatment. It was established by a postmortem analysis after 400 cycles that a lower amount of transition-metal cations dissolved (especially Ni) and a reduced number of surface cracks were formed for the 2 wt % TA-treated HE-NCMs compared to the untreated ones. We consider the proposed method of surface modification as a simple, cheap, and scalable approach to achieve a steady and superior electrochemical performance of HE-NCM cathodes.
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Affiliation(s)
- Sandipan Maiti
- Department of Chemistry, Bar-llan University, Ramat-Gan 5290002, Israel
| | - Hadar Sclar
- Department of Chemistry, Bar-llan University, Ramat-Gan 5290002, Israel
| | - Judith Grinblat
- Department of Chemistry, Bar-llan University, Ramat-Gan 5290002, Israel
| | - Michael Talianker
- Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Larisa Burstein
- Wolfson Applied Materials Research Center, Tel-Aviv University, Tel-Aviv 69978, Israel
| | - Malachi Noked
- Department of Chemistry, Bar-llan University, Ramat-Gan 5290002, Israel
| | - Boris Markovsky
- Department of Chemistry, Bar-llan University, Ramat-Gan 5290002, Israel
| | - Doron Aurbach
- Department of Chemistry, Bar-llan University, Ramat-Gan 5290002, Israel
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Paul I, Chatterjee A, Maiti S, Bhadoria PBS, Mitra A. Dynamic trajectories of volatile and non-volatile specialised metabolites in 'overnight' fragrant flowers of Murraya paniculata. Plant Biol (Stuttg) 2019; 21:899-910. [PMID: 30866144 DOI: 10.1111/plb.12983] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Accepted: 03/07/2019] [Indexed: 06/09/2023]
Abstract
Ephemeral flowers, especially nocturnal ones, usually emit characteristic scent profiles within their post-anthesis lifespans of a few hours. Whether these flowers exhibit temporal variability in the composition and profile of volatile and non-volatile specialised metabolites has received little attention. Flowers of Murraya paniculata bloom in the evenings during the summer and monsoon, and their sweet, intense fragrance enhances the plant's value as an ornamental. We aimed to investigate profiles of both volatile and non-volatile endogenous specialised metabolites (ESM) in nocturnal ephemeral flowers of M. paniculata to examine whether any biochemically diverse groups of ESM follow distinct patterns of accumulation while maintaining synchrony with defensive physiological functions. Targeted ESM contents of M. paniculata flowers were profiled at ten time points at 2-h intervals, starting from late bud stage (afternoon) up to the start of petal senescence (mid-morning). Emitted volatiles were monitored continuously within the whole 20-h period using headspace sampling. The ESM contents were mapped by time point to obtain a highly dynamic and biochemically diverse profile. Relative temporal patterns of ESM accumulation indicated that the active fragrance-emitting period might be divided into 'early bloom', 'mid-bloom' and 'late bloom' phases. Early and late bloom phases were characterised by high free radical generation, with immediate enhancement of antioxidant enzymes and phenolic compounds. The mid-bloom phase was relatively stable and dedicated to maximum fragrance emission, with provision for strong terpenoid-mediated defence against herbivores. The late bloom phase merged into senescence with the start of daylight; however, even the senescent petals continued to emit fragrance to attract diurnal pollinators. Our study suggests that dynamic relations between the different ESM groups regulate the short-term requirements of floral advertisement and phytochemical defence in this ephemeral flower. This study also provided fundamental information on the temporal occurrence of emitted volatiles and internal pools of specialised metabolites in M. paniculata flowers, which could serve as an important model for pollination biology of Rutaceae, which includes many important fruit crops.
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Affiliation(s)
- I Paul
- Natural Product Biotechnology Group, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
- Soil Science and Plant Nutrition Laboratory, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - A Chatterjee
- Soil Science and Plant Nutrition Laboratory, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - S Maiti
- Natural Product Biotechnology Group, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - P B S Bhadoria
- Soil Science and Plant Nutrition Laboratory, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - A Mitra
- Natural Product Biotechnology Group, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India
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13
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Susai FA, Sclar H, Shilina Y, Penki TR, Raman R, Maddukuri S, Maiti S, Halalay IC, Luski S, Markovsky B, Aurbach D. Horizons for Li-Ion Batteries Relevant to Electro-Mobility: High-Specific-Energy Cathodes and Chemically Active Separators. Adv Mater 2018; 30:e1801348. [PMID: 30015994 DOI: 10.1002/adma.201801348] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 04/26/2018] [Indexed: 05/22/2023]
Abstract
Li-ion batteries (LIBs) today face the challenge of application in electrified vehicles (xEVs) which require increased energy density, improved abuse tolerance, prolonged life, and low cost. LIB technology can significantly advance through more realistic approaches such as: i) stable high-specific-energy cathodes based on Li1+ x Niy Coz Mnw O2 (NCM) compounds with either Ni-rich (x = 0, y → 1), or Li- and Mn-rich (0.1 < x < 0.2, w > 0.5) compositions, and ii) chemically active separators and binders that mitigate battery performance degradation. While the stability of such cathode materials during cell operation tends to decrease with increasing specific capacity, active material doping and coatings, together with carefully designed cell-formation protocols, can enable both high specific capacities and good long-term stability. It has also been shown that major LIB capacity fading mechanisms can be reduced by multifunctional separators and binders that trap transition metal ions and/or scavenge acid species. Here, recent progress on improving Ni-rich and Mn-rich NCM cathode materials is reviewed, as well as in the search for inexpensive, multifunctional, chemically active separators. A realistic overview regarding some of the most promising approaches to improving the performance of rechargeable batteries for xEV applications is also presented.
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Affiliation(s)
- Francis Amalraj Susai
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Hadar Sclar
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Yuliya Shilina
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Tirupathi Rao Penki
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Ravikumar Raman
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Satyanarayana Maddukuri
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Sandipan Maiti
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Ion C Halalay
- General Motors Company, Global Research & Development, Warren, MI, 48090-9055, USA
| | - Shalom Luski
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Boris Markovsky
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Doron Aurbach
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
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14
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Thakur S, Maiti S, Paul T, Besra N, Sarkar S, Chattopadhyay KK. Geometrically intricate sheet-on-pillar/flake hierarchy embracing cobaltosic and manganese oxides over flexible carbon scaffold for binder-free high-energy-density supercapacitor. CrystEngComm 2018. [DOI: 10.1039/c8ce01182f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sheet-on-rod/flake hierarchy embracing Co3O4 and MnO2 on carbon fabric is used for binder-free high-energy-density supercapacitor. Electrochemical behaviour is illuminated on the basis of shape-porosity-property correlation.
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Affiliation(s)
- S. Thakur
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700032
- India
| | - S. Maiti
- St Thomas College of Engineering & Technology
- Kolkata 700023
- India
| | - T. Paul
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700032
- India
| | - N. Besra
- Departments of Physics
- Jadavpur University
- Kolkata 700032
- India
| | - S. Sarkar
- Departments of Physics
- Jadavpur University
- Kolkata 700032
- India
| | - K. K. Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700032
- India
- Departments of Physics
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15
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Nahar S, Nayak AK, Ghosh A, Subudhi U, Maiti S. Enhanced and synergistic downregulation of oncogenic miRNAs by self-assembled branched DNA. Nanoscale 2017; 10:195-202. [PMID: 29210414 DOI: 10.1039/c7nr06601e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
miRNAs, a group of small non-coding RNA molecules, regulate the expression of many genes involved in various cellular processes. Acute evidence suggests that one miRNA can regulate many genes as its targets, while one gene can be targeted by many miRNAs that co-operatively regulate the gene. Thus, targeting a single miRNA is not sufficient enough to rescue the disease phenotype but it is also essential to target multiple miRNAs simultaneously. This inspired us to design a novel DNA nanostructure that can concurrently downregulate multiple oncomiRNAs. Here we designed a programmable antimiR branched DNA (antimiR-bDNA) nanostructure having antimiRNAs for selective binding to oncomiRNAs miRNA-27a, 96 and 182 which collectively downregulate FOXO1a expression. The antimiR-bDNAs show enhanced stability compared to naked antimiRNAs in serum and are able to knockdown these miRNAs with up to ∼50% greater repression as compared to antimiRNAs. This synergistic miRNA repression leads to the restoration of FOXO1a protein levels which in turn inhibit G1-S traversion in cancer cells. To the best of our knowledge, this is the first study harnessing the ability of bDNA structures to silence multiple miRNAs simultaneously.
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Affiliation(s)
- S Nahar
- CSIR-Institute of Genomics & Integrative Biology, Mathura Road, Delhi 110025, India.
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16
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Mediouni S, Ekka M, Chinthalapudi K, Usui I, Mousseau G, Jablonski J, Clementz M, Nowak J, Beverage J, Esquenazi E, Nettles K, Baran P, Loret E, Izard T, Maiti S, Valente S. Molecular characterisation of the inhibitor didehydro-Cortistatin A with the HIV-1 Tat protein. J Virus Erad 2017. [DOI: 10.1016/s2055-6640(20)30679-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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17
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Kung HH, Maiti S, Wang X, Cheong SW, Maslov DL, Blumberg G. Chiral Spin Mode on the Surface of a Topological Insulator. Phys Rev Lett 2017; 119:136802. [PMID: 29341673 DOI: 10.1103/physrevlett.119.136802] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Indexed: 05/05/2023]
Abstract
Using polarization-resolved resonant Raman spectroscopy, we explore collective spin excitations of the chiral surface states in a three dimensional topological insulator, Bi_{2}Se_{3}. We observe a sharp peak at 150 meV in the pseudovector A_{2} symmetry channel of the Raman spectra. By comparing the data with calculations, we identify this peak as the transverse collective spin mode of surface Dirac fermions. This mode, unlike a Dirac plasmon or a surface plasmon in the charge sector of excitations, is analogous to a spin wave in a partially polarized Fermi liquid, with spin-orbit coupling playing the role of an effective magnetic field.
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Affiliation(s)
- H-H Kung
- Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
| | - S Maiti
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
| | - X Wang
- Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
- Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA
| | - S-W Cheong
- Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
- Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA
| | - D L Maslov
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
| | - G Blumberg
- Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
- National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia
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18
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Pramanik A, Maiti S, Sreemany M, Mahanty S. Rock-Salt-Templated Mn3
O4
Nanoparticles Encapsulated in a Mesoporous 2D Carbon Matrix: A High Rate 2 V Anode for Lithium-Ion Batteries with Extraordinary Cycling Stability. ChemistrySelect 2017. [DOI: 10.1002/slct.201701575] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Atin Pramanik
- CSIR-Central Glass & Ceramic Research Institute; 196 Raja S C Mullick Road Kolkata 700032 India
| | - Sandipan Maiti
- CSIR-Central Glass & Ceramic Research Institute; 196 Raja S C Mullick Road Kolkata 700032 India
| | - Monjoy Sreemany
- CSIR-Central Glass & Ceramic Research Institute; 196 Raja S C Mullick Road Kolkata 700032 India
| | - Sourindra Mahanty
- CSIR-Central Glass & Ceramic Research Institute; 196 Raja S C Mullick Road Kolkata 700032 India
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19
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Ni X, Maiti S, Langridge T, Cooper L, Duvic M. 654 Monitoring malignant T-cell clones by direct TCR expression assay in patients with leukemic cutaneous T-cell lymphoma over extracorporeal photopheresis. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Chakravarty A, Maiti S, Mahanty S, De G. Green Synthesis of Electrospun Porous Carbon Nanofibers from Sucrose and Doping of Ag Nanoparticle with Improved Electrical and Electrochemical Properties. ChemistrySelect 2017. [DOI: 10.1002/slct.201601920] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Amrita Chakravarty
- Nano-Structured Materials Division; CSIR-Central Glass & Ceramic Research Institute; 196, Raja S. C. Mullick Road Kolkata 700032 India
| | - Sandipan Maiti
- Fuel Cell & Battery Division; CSIR-Central Glass & Ceramic Research Institute; 196, Raja S. C. Mullick Road Kolkata 700032 India
| | - Sourindra Mahanty
- Fuel Cell & Battery Division; CSIR-Central Glass & Ceramic Research Institute; 196, Raja S. C. Mullick Road Kolkata 700032 India
| | - Goutam De
- Nano-Structured Materials Division; CSIR-Central Glass & Ceramic Research Institute; 196, Raja S. C. Mullick Road Kolkata 700032 India
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21
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22
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André A, Theurer C, Lauth J, Maiti S, Hodas M, Samadi Khoshkhoo M, Kinge S, Meixner AJ, Schreiber F, Siebbeles LDA, Braun K, Scheele M. Structure, transport and photoconductance of PbS quantum dot monolayers functionalized with a copper phthalocyanine derivative. Chem Commun (Camb) 2017; 53:1700-1703. [DOI: 10.1039/c6cc07878h] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We simultaneously surface-functionalize PbS nanocrystals with Cu 4,4′,4′′,4′′′-tetraaminophthalocyanine and assemble this hybrid material into macroscopic monolayers.
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23
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Maiti S, Maier TA, Böhm T, Hackl R, Hirschfeld PJ. Probing the Pairing Interaction and Multiple Bardasis-Schrieffer Modes Using Raman Spectroscopy. Phys Rev Lett 2016; 117:257001. [PMID: 28036201 DOI: 10.1103/physrevlett.117.257001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Indexed: 06/06/2023]
Abstract
In unconventional superconductors, understanding the form of the pairing interaction is the primary goal. In this regard, Raman spectroscopy is a very useful tool, as it identifies the ground state and also the subleading pairing channels by probing collective modes. Here, we propose a general theory for a multiband Raman response and identify new features in the spectrum that can provide a robust test for a pairing theory. We identify multiple Bardasis-Schrieffer type collective modes and connect the weights of these modes to the subleading gap structures within a microscopic pairing theory. While our conclusions are completely general, we apply our approach to interpret the specific case of B_{1g} Raman scattering in hole-doped BaFe_{2}As_{2}.
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Affiliation(s)
- S Maiti
- Department of Physics, University of Florida, Gainesville, Florida 32611
| | - T A Maier
- Center for Nanophase Materials Sciences and Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6494, USA
| | - T Böhm
- Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
- Fakultät für Physik E23, Technische Universität München, 85748 Garching, Germany
| | - R Hackl
- Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
| | - P J Hirschfeld
- Department of Physics, University of Florida, Gainesville, Florida 32611
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24
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Pramanik A, Maiti S, Sreemany M, Mahanty S. Carbon Doped MnCo 2 S 4 Microcubes Grown on Ni foam as High Energy Density Faradaic Electrode. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.07.159] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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25
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Linscheid A, Maiti S, Wang Y, Johnston S, Hirschfeld PJ. High T_{c} via Spin Fluctuations from Incipient Bands: Application to Monolayers and Intercalates of FeSe. Phys Rev Lett 2016; 117:077003. [PMID: 27563992 DOI: 10.1103/physrevlett.117.077003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Indexed: 06/06/2023]
Abstract
We investigate superconductivity in a two-band system with an electronlike and a holelike band, where one of the bands is away from the Fermi level (or "incipient"). We argue that the incipient band contributes significantly to spin-fluctuation pairing in the strong coupling limit where the system is close to a magnetic instability and can lead to a large T_{c}. In this case, T_{c} is limited by a competition between the frequency range of the coupling (set by an isolated paramagnon) and the coupling strength itself, such that a domelike T_{c} dependence on the incipient band position is obtained. The coupling of electrons to phonons is found to further enhance T_{c}. The results are discussed in the context of experiments on monolayers and intercalates of FeSe.
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Affiliation(s)
- A Linscheid
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
| | - S Maiti
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
| | - Y Wang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - S Johnston
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - P J Hirschfeld
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
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26
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Kumar P, Figliola M, Maiti S, Huls M, Kontoyiannis D, Tewari P, Richter A, Kaltz N, Champlin R, Cooper L. Unassisted Production of Clinical-Grade Viral-Specific T Cells: Bringing Production to the Bedside. Cytotherapy 2016. [DOI: 10.1016/j.jcyt.2016.03.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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27
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Bhattacharya K, Maiti S, Mandal C. PTEN negatively regulates mTORC2 formation and signaling in grade IV glioma via Rictor hyperphosphorylation at Thr1135 and direct the mode of action of an mTORC1/2 inhibitor. Oncogenesis 2016; 5:e227. [PMID: 27239959 PMCID: PMC4945751 DOI: 10.1038/oncsis.2016.34] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 03/10/2016] [Accepted: 03/14/2016] [Indexed: 02/07/2023] Open
Abstract
To investigate the role of PTEN (phosphatase and tensin homolog) in mammalian target of rapamycin complex 2 (mTORC2) signaling in glioblastoma multiforme (GBM), we found higher activation of mTORC2 in PTEN(mu) cells, as evidenced by enhanced phosphorylation of mTOR (Ser2481), AKT (Ser473) and glycogen synthase kinase 3 beta (GSK3β) (Ser9) as compared with PTEN(wt) cells. In addition, PTEN(wt) cells upon PTEN depletion showed mTORC2 activation. The reduced mTORC2 signaling in PTEN(wt) cells was related to higher Rictor phosphorylation at Thr1135 residue. Phosphorylation of Rictor at Thr1135 inhibited its association with mTORC and thus there was a reduction in mTORC2 complex formation. In addition, PTEN(wt) cells expressing mutated Rictor in which Thr1135 was substituted with alanine, showed enhanced mTORC2 formation and signaling. This enhanced mTORC2 signaling promoted inactivation of GSK3β. Thus, we established the reciprocal activation of mTORC2 and GSK3β in GBM. To the best of our knowledge, this is the first report describing role of PTEN in mTORC2 formation by promoting Rictor phosphorylation (Thr1135) in GBM. Furthermore, the drug sensitivity of mTORC2 was evaluated. A newly identified carbazole alkaloid, mahanine, showed cytotoxicity in both PTEN(mu) and PTEN(wt) cells. It inhibited both mTORC1/2 and AKT completely in PTEN(mu) cells, whereas it inhibited only mTORC1 in PTEN(wt) cells. Cytotoxity and AKT-inhibitory activity of the mTORC1/2 inhibitor was increased either by depleting PTEN or in combination with phosphatidylinositol 3 kinase inhibitors in PTEN(wt) cells. In contrast, depletion of Rictor decreased the cytotoxicity of the mTORC1/2 inhibitor in PTEN(mu) cells. Thus, PTEN has an important role in mTORC2 formation and also influences the effectiveness of an mTORC1/2 inhibitor in GBM.
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Affiliation(s)
- K Bhattacharya
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Biology, Kolkata, India
| | - S Maiti
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Biology, Kolkata, India
| | - C Mandal
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Biology, Kolkata, India
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28
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Maiti S, Pramanik A, Mahanty S. Electrochemical energy storage in Mn2O3 porous nanobars derived from morphology-conserved transformation of benzenetricarboxylate-bridged metal–organic framework. CrystEngComm 2016. [DOI: 10.1039/c5ce01976a] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
MOF-derived Mn2O3 shows a high capacity of ∼410 mA h g−1 as a 2 V anode and an ultrahigh energy density of 147.4 W h kg−1 as a supercapacitor.
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Affiliation(s)
- Sandipan Maiti
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032, India
- CSIR-Network Institutes for Solar Energy (NISE)
- India
| | - Atin Pramanik
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032, India
- CSIR-Network Institutes for Solar Energy (NISE)
- India
| | - Sourindra Mahanty
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032, India
- CSIR-Network Institutes for Solar Energy (NISE)
- India
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29
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Abstract
ZnO/ZnS@Co3O4 pseudocapacitor with high specific capacitance and energy density.
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Affiliation(s)
- Sanjit Sarkar
- Department of Solid State Physics
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Sandipan Maiti
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata-700 032
- India
| | - Sourindra Mahanty
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata-700 032
- India
| | - Durga Basak
- Department of Solid State Physics
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
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30
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Maiti S, Pramanik A, Chattopadhyay S, De G, Mahanty S. Electrochemical energy storage in montmorillonite K10 clay based composite as supercapacitor using ionic liquid electrolyte. J Colloid Interface Sci 2015; 464:73-82. [PMID: 26609925 DOI: 10.1016/j.jcis.2015.11.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 11/06/2015] [Accepted: 11/06/2015] [Indexed: 10/22/2022]
Abstract
Exploring new electrode materials is the key to realize high performance energy storage devices for effective utilization of renewable energy. Natural clays with layered structure and high surface area are prospective materials for electrical double layer capacitors (EDLC). In this work, a novel hybrid composite based on acid-leached montmorillonite (K10), multi-walled carbon nanotube (MWCNT) and manganese dioxide (MnO2) was prepared and its electrochemical properties were investigated by fabricating two-electrode asymmetric supercapacitor cells against activated carbon (AC) using 1.0M tetraethylammonium tetrafluroborate (Et4NBF4) in acetonitrile (AN) as electrolyte. The asymmetric supercapacitors, capable of operating in a wide potential window of 0.0-2.7V, showed a high energy density of 171Whkg(-1) at a power density of ∼1.98kWkg(-1). Such high EDLC performance could possibly be linked to the acid-base interaction of K10 through its surface hydroxyl groups with the tetraethylammonium cation [(C2H5)4N(+) or TEA(+)] of the ionic liquid electrolyte. Even at a very high power density of 96.4kWkg(-1), the cells could still deliver an energy density of 91.1Whkg(-1) exhibiting an outstanding rate capability. The present study demonstrates for the first time, the excellent potential of clay-based composites for high power energy storage device applications.
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Affiliation(s)
- Sandipan Maiti
- Fuel Cell & Battery Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata 700032, India; CSIR-Network Institutes for Solar Energy (NISE), India
| | - Atin Pramanik
- Fuel Cell & Battery Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata 700032, India; CSIR-Network Institutes for Solar Energy (NISE), India
| | - Shreyasi Chattopadhyay
- Nano-structured Materials Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata 700032, India
| | - Goutam De
- Nano-structured Materials Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata 700032, India
| | - Sourindra Mahanty
- Fuel Cell & Battery Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata 700032, India; CSIR-Network Institutes for Solar Energy (NISE), India.
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Maiti S, Pramanik A, Manju U, Mahanty S. Reversible Lithium Storage in Manganese 1,3,5-Benzenetricarboxylate Metal-Organic Framework with High Capacity and Rate Performance. ACS Appl Mater Interfaces 2015; 7:16357-63. [PMID: 26158782 DOI: 10.1021/acsami.5b03414] [Citation(s) in RCA: 151] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Metal organic frameworks (MOFs) with diverse structural chemistry are being projected as futuristic electrode materials for Li-ion batteries. In this work, we report synthesis of Mn-1,3,5-benzenetricarboxylate MOF by a simple solvothermal method and its application as an anode material for the first time. Scanning electron microscopy of the synthesized MOF shows a bar shaped morphology where these bars, about 1 μm wide and of varied lengths between 2 and 20 μm, are made of porous sheets containing mesoporous walls and macroporous channels. The MOF anode, when examined in the potential window of 0.01-2.0 V versus Li/Li(+), shows high specific capacities of 694 and 400 mAh g(-1) at current densities of 0.1 and 1.0 A g(-1) along with good cyclability, retention of capacity, and sustenance of the MOF network. Ex situ X-ray diffraction, Fourier transform infrared, and X-ray photoelectron spectroscopy studies on the electrode material at different states of charge suggest that the usual conversion reaction for Li storage might not be applicable in this case. Conjugated carboxylates being weakly electron withdrawing ligands with a stronger π-π interaction, a probable alternative Li storage mechanism has been proposed that involves the organic moiety. The present results show promise for applying Mn-1,3,5-benzenetricarboxylate MOF as high performance <2 V anode.
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Affiliation(s)
- Sandipan Maiti
- ‡CSIR-Network Institutes for Solar Energy (NISE), New Delhi, India
| | - Atin Pramanik
- ‡CSIR-Network Institutes for Solar Energy (NISE), New Delhi, India
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Pezzato C, Maiti S, Chen JLY, Cazzolaro A, Gobbo C, Prins LJ. Monolayer protected gold nanoparticles with metal-ion binding sites: functional systems for chemosensing applications. Chem Commun (Camb) 2015; 51:9922-31. [DOI: 10.1039/c5cc00814j] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Au NPs containing binding sites for metal ions in the monolayer are attractive components of sensing assays.
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Affiliation(s)
- C. Pezzato
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| | - S. Maiti
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| | - J. L.-Y. Chen
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| | - A. Cazzolaro
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| | - C. Gobbo
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
| | - L. J. Prins
- Department of Chemical Sciences
- University of Padova
- 35131 Padova
- Italy
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Abstract
A Cu(OH)2@RGO symmetric supercapacitor cell shows an excellent energy density and power density (84.5 Wh kg−1at 550 W kg−1).
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Affiliation(s)
- Atin Pramanik
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032 and CSIR-Network of Institutes for Solar Energy (NISE)
- New Delhi
- India
| | - Sandipan Maiti
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032 and CSIR-Network of Institutes for Solar Energy (NISE)
- New Delhi
- India
| | - Sourindra Mahanty
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032 and CSIR-Network of Institutes for Solar Energy (NISE)
- New Delhi
- India
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34
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Maiti S, Pramanik A, Mahanty S. Influence of imidazolium-based ionic liquid electrolytes on the performance of nano-structured MnO2 hollow spheres as electrochemical supercapacitor. RSC Adv 2015. [DOI: 10.1039/c5ra05514h] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Activated carbon//MnO2 hollow sphere asymmetric supercapacitor shows an energy density of 163 W h kg−1 in EMIMBF4 ionic liquid as electrolyte.
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Affiliation(s)
- Sandipan Maiti
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032
- India
- CSIR-Network Institutes for Solar Energy (NISE)
| | - Atin Pramanik
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032
- India
- CSIR-Network Institutes for Solar Energy (NISE)
| | - Sourindra Mahanty
- Fuel Cell & Battery Division
- CSIR-Central Glass & Ceramic Research Institute
- Kolkata 700032
- India
- CSIR-Network Institutes for Solar Energy (NISE)
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Koželj P, Vrtnik S, Jelen A, Jazbec S, Jagličić Z, Maiti S, Feuerbacher M, Steurer W, Dolinšek J. Discovery of a superconducting high-entropy alloy. Phys Rev Lett 2014; 113:107001. [PMID: 25238377 DOI: 10.1103/physrevlett.113.107001] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2014] [Indexed: 06/03/2023]
Abstract
High-entropy alloys (HEAs) are multicomponent mixtures of elements in similar concentrations, where the high entropy of mixing can stabilize disordered solid-solution phases with simple structures like a body-centered cubic or a face-centered cubic, in competition with ordered crystalline intermetallic phases. We have synthesized an HEA with the composition Ta34Nb33Hf8Zr14Ti11 (in at. %), which possesses an average body-centered cubic structure of lattice parameter a=3.36 Å. The measurements of the electrical resistivity, the magnetization and magnetic susceptibility, and the specific heat revealed that the Ta34Nb33Hf8Zr14Ti11 HEA is a type II superconductor with a transition temperature Tc≈7.3 K, an upper critical field μ0H_c2≈8.2 T, a lower critical field μ0Hc1≈32 mT, and an energy gap in the electronic density of states (DOS) at the Fermi level of 2Δ≈2.2 meV. The investigated HEA is close to a BCS-type phonon-mediated superconductor in the weak electron-phonon coupling limit, classifying it as a "dirty" superconductor. We show that the lattice degrees of freedom obey Vegard's rule of mixtures, indicating completely random mixing of the elements on the HEA lattice, whereas the electronic degrees of freedom do not obey this rule even approximately so that the electronic properties of a HEA are not a "cocktail" of properties of the constituent elements. The formation of a superconducting gap contributes to the electronic stabilization of the HEA state at low temperatures, where the entropic stabilization is ineffective, but the electronic energy gain due to the superconducting transition is too small for the global stabilization of the disordered state, which remains metastable.
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Affiliation(s)
- P Koželj
- Faculty of Mathematics and Physics, J. Stefan Institute and University of Ljubljana, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - S Vrtnik
- Faculty of Mathematics and Physics, J. Stefan Institute and University of Ljubljana, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - A Jelen
- Faculty of Mathematics and Physics, J. Stefan Institute and University of Ljubljana, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - S Jazbec
- Faculty of Mathematics and Physics, J. Stefan Institute and University of Ljubljana, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Z Jagličić
- Faculty of Civil and Geodetic Engineering, Institute of Mathematics, Physics and Mechanics and University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
| | - S Maiti
- Department of Materials, Laboratory of Crystallography, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland
| | - M Feuerbacher
- Institut für Mikrostrukturforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - W Steurer
- Department of Materials, Laboratory of Crystallography, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland
| | - J Dolinšek
- Faculty of Mathematics and Physics, J. Stefan Institute and University of Ljubljana, Jamova 39, SI-1000 Ljubljana, Slovenia
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VanGennep D, Maiti S, Graf D, Tozer SW, Martin C, Berger H, Maslov DL, Hamlin JJ. Pressure tuning the Fermi level through the Dirac point of giant Rashba semiconductor BiTeI. J Phys Condens Matter 2014; 26:342202. [PMID: 25090658 DOI: 10.1088/0953-8984/26/34/342202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report measurements of Shubnikov-de Haas oscillations in the giant Rashba semiconductor BiTeI under applied pressures up to ∼2 GPa. We observe one high frequency oscillation at all pressures and one low frequency oscillation that emerges between ∼0.3-0.7 GPa indicating the appearance of a second small Fermi surface. BiTeI has a conduction band bottom that is split into two sub-bands due to the strong Rashba coupling, resulting in a 'Dirac point'. Our results suggest that the chemical potential starts below the Dirac point in the conduction band at ambient pressure and moves upward, crossing it as pressure is increased. The presence of the chemical potential above this Dirac point results in two Fermi surfaces. We present a simple model that captures this effect and can be used to understand the pressure dependence of our sample parameters. These extracted parameters are in quantitative agreement with first-principles calculations and other experiments. The parameters extracted via our model support the notion that pressure brings the system closer to the predicted topological quantum phase transition.
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Affiliation(s)
- D VanGennep
- Department of Physics, University of Florida, Gainesville, FL 32611, USA
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Maiti S, Pramanik A, Mahanty S. Extraordinarily high pseudocapacitance of metal organic framework derived nanostructured cerium oxide. Chem Commun (Camb) 2014; 50:11717-20. [DOI: 10.1039/c4cc05363j] [Citation(s) in RCA: 178] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Maiti S, Pramanik A, Mahanty S. Interconnected network of MnO2 nanowires with a "cocoonlike" morphology: redox couple-mediated performance enhancement in symmetric aqueous supercapacitor. ACS Appl Mater Interfaces 2014; 6:10754-10762. [PMID: 24930698 DOI: 10.1021/am502638d] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Low electronic conductivity and slow faradic processes limit the performance of MnO2 as an electrochemical pseudocapacitor with respect to cycling and power density. Herein, we report preparation of single-phase α-MnO2, composed of an interconnected nanowire network with "cocoonlike" morphology, and its application as electrode in a symmetric aqueous supercapacitor. Increased "effective" surface area, coexistence of micropores and mesopores, and enhanced electron transport in these nanowire networks result in a specific pseudocapacitance (CS) of 775 F·g(-1) in 3 M KOH, derived from cyclic voltammetry in the potential window of -1 to +1 V at a scan rate of 2 mV·s(-1), the highest reported for two-electrode symmetric configuration. Furthermore, introduction of K4Fe(CN)6 as a redox-active additive to KOH results in ∼7 times increase in energy density at a power density of ∼6000 W·kg(-1). The presence of the Fe(CN)6(4-)/Fe(CN)6(3-) redox couple provides an electron buffer source compensating for the slow faradic reactions. The results demonstrate that this simple approach might be an effective way to enhance the redox kinetics and reversibility of transition metal oxide-based pseudocapacitors.
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Affiliation(s)
- Sandipan Maiti
- Fuel Cell & Battery Division, Central Glass & Ceramic Research Institute, Council of Scientific and Industrial Research , Kolkata 700032, India
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Santra S, Das N, Maiti S, Chattopadhyay K. Wide band gap p-type CuBO2 nanostructures by hydrothermal route and fabrication high quality p-CuBO2/n-ZnO nano-heterojunction. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.04.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Datta S, Maiti S, Das G, Chatterjee A, Ghosh P. Incomplete Kawasaki disease - a diagnostic and therapeutic challenge. J Coll Med Sci-Nepal 2014. [DOI: 10.3126/jcmsn.v9i4.10234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background The diagnosis of classical Kawasaki Disease was based on clinical criteria. The conventional criteria is particularly useful in preventing over diagnosis, but at the same time it may result in failure to recognize the incomplete form of Kawasaki Disease. Objective To suspect incomplete Kawasaki Disease, because early diagnosis and proper treatment may reduce substantial risk of developing coronary artery abnormality which is one of the leading causes of acquired heart disease in children. Method Nine cases of incomplete Kawasaki Disease were diagnosed over a period of one year. The diagnosis of incomplete Kawasaki Disease was based on fever for five days with less than four classical clinical features and cardiac abnormality detected by 2D- echocardiography. A repeat echocardiography was done after 6 weeks of onset of illness. The patients were treated with Intravenous Immunoglobulin and/or aspirin. Result The mean age of the patients was 3.83 years and the mean duration of symptoms before diagnosis was 12.1 days. Apart from other criteria all of our patients had edema and extreme irritability. All the patients had abnormal echocardiographic finding. Five patients received only aspirin due to nonaffordability of Intravenous Immunoglobulin and four patients received both aspirin and Intravenous Immunoglobulin, but the outcome was excellent in all the cases. Conclusion Incomplete Kawasaki Disease can be diagnosed with more awareness and aspirin alone may be used as a second line therapy in case of non affordability of Intravenous Immunoglobulin. Journal of College of Medical Sciences-Nepal, 2013, Vol-9, No-4, 30-35 DOI: http://dx.doi.org/10.3126/jcmsn.v9i4.10234
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Shrivastava NK, Maiti S, Suin S, Khatua BB. Influence of selective dispersion of MWCNT on electrical percolation of in-situ polymerized high-impact polystyrene/MWCNT nanocomposites. EXPRESS POLYM LETT 2014. [DOI: 10.3144/expresspolymlett.2014.3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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43
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Abdusamad K, Hamoudi R, Maiti S. Simultaneous bilateral torsion of the adnexae in an adult female without any history of ovarian stimulation. BMJ Case Rep 2013; 2013:bcr-2012-007909. [PMID: 23370946 DOI: 10.1136/bcr-2012-007909] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Simultaneous bilateral adnexal torsion is very rare especially in adults. There have been few cases reported in children with only one previous case reported in adults since 1984, which was complicated by entanglement of both adnexae. In adults, the use of ovarian stimulation for treatment of infertility can increase the risk of ovarian torsion. We report the second case of simultaneous bilateral adnexal torsion in an adult female without follicular stimulation.
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Affiliation(s)
- Kula Abdusamad
- Department of Obstetrics and Gynaecology, North Manchester General Hospital, Pennine Acute Trust, Manchester, UK.
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Maiti S, Shrivastava NK, Suin S, Khatua BB. A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties. EXPRESS POLYM LETT 2013. [DOI: 10.3144/expresspolymlett.2013.47] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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45
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Thapa R, Maiti S, Rana T, Maiti U, Chattopadhyay K. Anatase TiO2 nanoparticles synthesis via simple hydrothermal route: Degradation of Orange II, Methyl Orange and Rhodamine B. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2012.06.013] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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46
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Maiti S, De D, Ali KM, Ghosh A, Ghosh D, Paul S. Evaluation of Nutritional Status by Mid-Upper Arm Circumference Amongst Affluent Children. J Nepal Paedtr Soc 2012. [DOI: 10.3126/jnps.v32i2.5689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Introduction: Anthropometry is widely accepted as low-cost technique for defining the nutritional status of children. The mid upper arm circumference (MUAC) is a fast screening method in detecting acute malnutrition and it is also a predictor of childhood mortality. Materials and Methods: This is the retrospective study to evaluate the nutritional status based on mid upper arm circumference (MUAC) among urban, pre-school age children. A total of 1060 children, aged 1 to 3 years, attending the vaccination clinic of the Indian Red Cross Society Paschim Medinipur Hospital over a two years period, were enrolled in the study. The measurement of MUAC (in centimetres) was taken by the standard technique. Undernutrition was defined based on age and sex-specific MUAC cut-off values as recommended by the World Health Organization (WHO). Results: Boys were higher level of mean MUAC than girls at all ages and there was no significant sex differences. The age-combined rate of overall undernutrition was 18.96% and it was slightly higher among the boys (19.38%) than girls (18.46%). The age-combined moderate undernutrition was higher among the boys (16.08% vs 14.11%) but girls’ value was higher in case of severe undernutrition (3.28% vs 4.35%). Conclusion: The present study showed that a remarkable number of pre-schooler was undernourished based on MUAC. J. Nepal Paediatr. Soc. 32(2) 2012 113-116 doi: http://dx.doi.org/10.3126/jnps.v32i2.5689
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Paruya S, Maiti S, Karmakar A, Gupta P, Sarkar J. Lumped parameterization of boiling channel—Bifurcations during density wave oscillations. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2012.02.039] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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48
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Castellan JP, Rosenkranz S, Goremychkin EA, Chung DY, Todorov IS, Kanatzidis MG, Eremin I, Knolle J, Chubukov AV, Maiti S, Norman MR, Weber F, Claus H, Guidi T, Bewley RI, Osborn R. Effect of Fermi surface nesting on resonant spin excitations in Ba(1-x)K(x)Fe2As2. Phys Rev Lett 2011; 107:177003. [PMID: 22107566 DOI: 10.1103/physrevlett.107.177003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Indexed: 05/31/2023]
Abstract
We report inelastic neutron scattering measurements of the resonant spin excitations in Ba(1-x)K(x)Fe(2)As(2) over a broad range of electron band filling. The fall in the superconducting transition temperature with hole doping coincides with the magnetic excitations splitting into two incommensurate peaks because of the growing mismatch in the hole and electron Fermi surface volumes, as confirmed by a tight-binding model with s(±)-symmetry pairing. The reduction in Fermi surface nesting is accompanied by a collapse of the resonance binding energy and its spectral weight, caused by the weakening of electron-electron correlations.
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Affiliation(s)
- J-P Castellan
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845, USA
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Maiti S, Korshunov MM, Maier TA, Hirschfeld PJ, Chubukov AV. Evolution of the superconducting state of Fe-based compounds with doping. Phys Rev Lett 2011; 107:147002. [PMID: 22107230 DOI: 10.1103/physrevlett.107.147002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2011] [Indexed: 05/31/2023]
Abstract
We introduce an effective low-energy pairing model for Fe-based superconductors with s- and d-wave interaction components and a small number of input parameters and use it to study the doping evolution of the symmetry and the structure of the superconducting gap. We argue that the model describes the entire variety of pairing states found so far in the Fe-based superconductors and allows one to understand the mechanism of the attraction in s(±) and d(x(2)-y(2)) channels, the competition between s- and d-wave solutions, and the origin of superconductivity in heavily doped systems, when only electron or only hole pockets are present.
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Affiliation(s)
- S Maiti
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
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50
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Maiti S, Steurer W. Crystal structures of high-entropy alloys of high melting temperature. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311089380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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