1
|
Jain P, Mazumder M, Pradeep KR, Viswanatha R, Pati SK, Narayana C. Polaronic Signatures in Doped and Undoped Cesium Lead Halide Perovskite Nanocrystals through a Photoinduced Raman Mode. ACS Appl Mater Interfaces 2022; 14:5567-5577. [PMID: 35041391 DOI: 10.1021/acsami.1c20321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Lead halide perovskites (LHPs) are promising candidates for photovoltaic applications as they exhibit large carrier diffusion lengths and long carrier lifetimes among many other interesting properties. One of the widely accepted mechanisms for these properties is polaron formation, which is mainly driven by octahedral distortions of the inorganic framework. Since structure modifications of the framework largely affect associated distortions, we investigated Mn-doped and undoped CsPbX3 (where X = Cl, Br, Cl/Br) using a local probe via micro-Raman spectroscopy and density functional theory (DFT) calculations for polaron formation. Our results highlight a new vibrational lattice mode at 132 cm-1 due to polaronic distortion upon photoinduction. From the DFT studies, we have shown that the polaronic states are dominated by the B-site cation in the perovskite structure, but it is the strong covalent overlap of the halide which determines its stability. This elucidation to map polaronic signatures with excellent spatial resolution using traditional Raman spectroscopy can be used as a simple tool to understand the structural changes and their impacted electronic properties and thus design superior devices using its in situ applications.
Collapse
Affiliation(s)
- Priyanka Jain
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
| | - Madhulika Mazumder
- School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
| | - K R Pradeep
- School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- International Centre for Material Science, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
| | - Ranjani Viswanatha
- School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- International Centre for Material Science, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
| | - Swapan K Pati
- School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
| | - Chandrabhas Narayana
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru 560064, India
- Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, Kerala 695014, India
| |
Collapse
|
2
|
Moniruzzaman M, Ali MA, Akter T, Rashid MA, Kamruzzaman M, Latif T, Khan RH, Das MK, Sarker UK, Mazumder M. Comparison of Ultrasonogram of Brain Findings of Asphyxiated and Non-Asphyxiated Baby Admitted in Neonatal Ward in a Tertiary Level Hospital. Mymensingh Med J 2019; 28:497-502. [PMID: 31391417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Perinatal asphyxia is a major cause of neonatal mortality and morbidity in developing countries. A significant portion of patient with perinatal asphyxia is admitted with complications. Cerebral complications are the most devastating and the child may be left with lifelong neurological impairment. Therefore, the high index of suspicion, prompt recognition and thorough understanding of common sonographic abnormalities are necessary to ensure timely intervention, management and counseling. A hospital based case control study was conducted in the neonatal unit of Mymensingh Medical College Hospital, Mymensingh, Bangladesh. Study period was six months (June 2012 to December 2012). This study was done to compare the ultra sonogram of brain findings of admitted asphyxiated babies with admitted non-asphyxiated babies. A total of 30 asphyxiated (case) and another 30 non-asphyxiated (control) neonate of this department were enrolled in the study. Necessary information was collected by taking detailed history, clinical examination and also close follow up of the neonates according to pre-designed questionnaire. The main outcome variable was abnormality in cranial ultrasound. Among case group (30 neonates), ultrasonogram of brain findings were abnormal in 9(30.0%) cases. Among them most common was ventricular dilatation 5(16.6%), followed by Intraventricular hemorrhage (IVH) 1(3.0%), intracranial hemorrhage 1(3.0%), HIE 1(3.0%) and cerebral edema in 1(3.0%) cases. On the contrarary, among asphyxiated control group all 30 cases had normal ultra sonogram of brain. In case group 22 babies had normal birth weight and 08 had low birth weight. Among the 22 normal birth weight neonates in case group total 6(27.2%) cases had abnormal ultra sonogram findings. Among normal birth weight cases 3(13.6%) had ventricular dilatation, 1(4.5%) Intracranial hemorrhage (ICH), 1(4.5%) HIE, 1(4.5%) cerebral edema. Among 08 low birth weight neonates in case group total 3(37.5%) cases had abnormal ultrasonogram of brain finding. Among low birth weight cases 2(25%) had ventricular dilatation, 1(12.5%) IVH. Ultrasonogram brain findings difference between two groups was statistically significant. Abnormal findings were also common in low birth weight babies than normal birth weight babies. So, early detection of abnormal brain changes can help us for proper management and counseling.
Collapse
Affiliation(s)
- M Moniruzzaman
- Dr Morshed Md Moniruzzaman, Ex-Assistant Registrar, Department of Paediatrics, Mymensingh Medical College Hospital, Mymensingh, Bangladesh
| | | | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Terracciano A, Islam M, Mazumder M, Schwabe-Warf D, Stephan Y, Sutin A. PERSONALITY CHANGES WITH DEMENTIA FROM THE INFORMANT PERSPECTIVE: NEW DATA AND META-ANALYSIS. Innov Aging 2018. [DOI: 10.1093/geroni/igy031.3605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
4
|
Abstract
Liquid exfoliation of grey arsenic results in few-layer arsenene nanosheets and nanodots.
Collapse
Affiliation(s)
- Pratap Vishnoi
- New Chemistry Unit and Theoretical Sciences Unit International Centre for Materials Science and Sheikh Saqr Laboratory Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560 064
- India
| | - Madhulika Mazumder
- New Chemistry Unit and Theoretical Sciences Unit International Centre for Materials Science and Sheikh Saqr Laboratory Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560 064
- India
| | - Swapan K. Pati
- New Chemistry Unit and Theoretical Sciences Unit International Centre for Materials Science and Sheikh Saqr Laboratory Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560 064
- India
| | - C. N. R. Rao
- New Chemistry Unit and Theoretical Sciences Unit International Centre for Materials Science and Sheikh Saqr Laboratory Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore-560 064
- India
| |
Collapse
|
5
|
Parul SS, Mazumder M, Debnath BC, Haque ME. Serum adiponectin in patients with coronary heart disease. Mymensingh Med J 2011; 20:78-82. [PMID: 21240167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Adiponectin is an adipocyte derived hormone, a modulator of lipid metabolism and systemic inflammation. It has potential anti-atherogenic property. Adiponectin is present in low concentration in patients with obesity, insulin resistance (IR), Type 2 diabetes mellitus (T2DM) and coronary heart disease (CHD). In this case control study, we studied the association of Serum adiponectin with CHD. Sixty-four subjects were enrolled. Consecutive 31 CHD patients (Group I) and 33 healthy controls (Group II) were included. Serum adiponectin & lipid profile were estimated in all. Serum adiponectin was significantly lower in CHD patients (3.90±2.21μg/ml) in comparison with controls (5.09±2.13μg/ml)(P<0.05). There was no significant difference of any fraction of lipid profile between cases and controls. Significant negative correlation was observed between Serum adiponectin and Serum triacylglyceride (STG) in cases (P<0.01). It may be concluded that low serum adiponectin may have some important role in development of CHD and probably low adiponectin and dyslipidemia are linked in the development of atherosclerosis. Further study is recommended with larger sample size to explore the role of hypoadiponectinemia in the causation of CHD.
Collapse
Affiliation(s)
- S S Parul
- Department of Biochemistry, Sylhet MAG Osmani Medical College, Sylhet, Bangladesh
| | | | | | | |
Collapse
|
6
|
Borca-Tasciuc T, Mazumder M, Son Y, Pal SK, Schadler LS, Ajayan PM. Anisotropic thermal diffusivity characterization of aligned carbon nanotube-polymer composites. J Nanosci Nanotechnol 2007; 7:1581-8. [PMID: 17450929 DOI: 10.1166/jnn.2007.657] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The anisotropic thermal diffusivity of aligned carbon nanotube-polymer composites was determined using a photothermoelectric technique. The composites were obtained by infiltrating poly-dimethyl siloxane (PDMS) in aligned multiwall CNT arrays grown by chemical vapor deposition on silicon substrates. The thermal diffusivities are insensitive to temperature in the range of 180 K-300 K. The thermal diffusivity values across the alignment direction are approximately 2-4 times smaller than along the alignment direction and larger than effective media theory predictions using reported values for the thermal diffusivity of millimeter thick aligned multiwall carbon nanotube arrays. The effective room temperature thermal conductivity of the composite along the carbon nanotube alignment direction is at least 6X larger than the thermal conductivity of the polymer matrix and is in good agreement with the effective media predictions. This work indicates that infiltration of long and aligned carbon nanotube arrays is currently the most efficient method to obtain high thermal conductivity polymer composites.
Collapse
Affiliation(s)
- T Borca-Tasciuc
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | | | | | | | | | | |
Collapse
|
7
|
Kobrinsky M, Chakravarty S, Jiao D, Harmes M, List S, Mazumder M. Experimental validation of crosstalk simulations for on-chip interconnects using S-parameters. ACTA ACUST UNITED AC 2005. [DOI: 10.1109/tadvp.2004.841672] [Citation(s) in RCA: 31] [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: 11/09/2022]
|
8
|
Mazumder M, Sengupta B, De M, Lahiri P, Bhattacharya DK. Immunosurveillance of transfusion dependent thalassaemia and hepatitis B vaccination. J Assoc Physicians India 1993; 41:342-4. [PMID: 8005968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The study evaluates the probable alteration of the immune system in multitransfused thalassaemics and the modification of their immune response following administration of hepatitis B virus (HBV) vaccine. B-thalassaemics (n = 50) and EB-thalassaemics (n = 30) who received multiple blood transfusion for the chronic anaemic status had significant iron overload. They had high prevalence for hepatitis B carrier state and almost all were exposed to hepatitis B virus during the course of transfusion as shown by the positivity of hepatitis B virus markers. Thalassaemics in presence of iron overload have altered immune status in terms of depressed T-lymphocytes and raised immunoglobulins G and M. However, they showed 100 per cent seroconversion with production of antibody to hepatitis B surface antigen following Hepatitis B vaccination.
Collapse
Affiliation(s)
- M Mazumder
- Society for Research, Haematology and Blood Transfusion, Calcutta
| | | | | | | | | |
Collapse
|
9
|
Abstract
The aerodynamic size distribution of cromolyn sodium was determined at ambient and high (98%) humidity using the single particle aerodynamic relaxation time analyzer. This instrument measures the aerodynamic size single, suspended solid particles and liquid droplets in the respirable size range. The measurement accommodates all properties such as density, shape and surface characteristics that affect aerodynamic behavior. Particle morphology under ambient humidity conditions was studied using scanning electron microscopy. Count median aerodynamic diameter increased from 1.40 to 1.52 micron (p < 0.05), and the mass median aerodynamic diameter increased from 2.31 to 3.02 micron (p < 0.005) when measured at ambient and high humidities. The total mass of 0.99 mg of active ingredient aerosolized at ambient humidity in the size range compatible with pulmonary deposition was approximately 5% of the total mass of active ingredient packaged in the capsule. The low mass of particle aerosolized in the size range appropriate for pulmonary deposition may explain the low estimated deposition of cromolyn reported by other investigators.
Collapse
|
10
|
Hiller C, Mazumder M, Wilson D, Bone R. Aerodynamic size distribution of metered-dose bronchodilator aerosols. Am Rev Respir Dis 1978; 118:311-7. [PMID: 697181 DOI: 10.1164/arrd.1978.118.2.311] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The aerodynamic size distributions of 9 commonly used bronchodilator aerosols were determined by using a new instrument, the single-particle, aerodynamic relaxation time analyzer, which can measure the aerodynamic size of single particles and droplets in real time independent of density, shape, and other physical characteristics. The following commercial preparations were studied: Duo-Medihaler, Medihaler-Epi, Medihaler-Epi Medihaler-Iso, Norisodrine Aerotrol, Alupent, Metaprel, Isuprel Mistometer, Bronkometer, and Asthma-Meter. Count median diameters ranged from 0.62 to 0.82 micrometer, and mass median aerodynamic diameters ranged from 2.8 to 4.3 micrometer. The heterodisperse nature of the aerosols was demonstrated by the relatively large geometric standard deviations, which ranged from 1.5 to 2.1. None of these aerosols had a log-normal distribution; rather, the distribution curves were multimodal.
Collapse
|