1
|
Senapati S, Thakur R, Verma SP, Duggal S, Mishra DP, Das P, Shripathi T, Kumar M, Rana D, Maiti P. Corrigendum to "Layered double hydroxides as effective carrier for anticancer drugs and tailoring of release rate through interlayer anions" [Journal of Controlled Release 224 (2106) 186-198]. J Control Release 2021; 337:645. [PMID: 34391070 DOI: 10.1016/j.jconrel.2021.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Sudipta Senapati
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221 005, India
| | - Ravi Thakur
- Cell Death Research Laboratory, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Shiv Prakash Verma
- Centre for Genetic Disorders, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Shivali Duggal
- Cell Death Research Laboratory, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Durga Prasad Mishra
- Cell Death Research Laboratory, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Parimal Das
- Centre for Genetic Disorders, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - T Shripathi
- UGC-DAE CSR, University Campus, Khandwa Road, Indore 452 001, India
| | - Mohan Kumar
- Department of Pathology, Institute of Medical Science, Banaras Hindu University, Varanasi 221005, India
| | - Dipak Rana
- Industrial Membrane Research Institute, Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur St., Ottawa, ON KIN 6N5, Canada
| | - Pralay Maiti
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221 005, India.
| |
Collapse
|
2
|
Fatima A, Venkatesh AS, Mukherjee R, Agrawal AK, Singh B, Sarkar PS, Kashyap Y, Shripathi T. 3D spatial distribution of ore mineral phases using high resolution synchrotron micro-computed tomography (μCT) combined with optical microscopy. Appl Radiat Isot 2019; 148:49-59. [PMID: 30921617 DOI: 10.1016/j.apradiso.2019.03.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 06/15/2017] [Revised: 02/28/2019] [Accepted: 03/06/2019] [Indexed: 11/24/2022]
Abstract
Ore minerals in dolomites and Graphite Mica Schist (GMS) were studied by synchrotron radiation micro-computed tomography (SR-μCT) and optical microscopy. High resolution μCT images of ore minerals were obtained at Imaging Beamline (BL-4), Indus-2 synchrotron radiation source for the comprehensive volume characterization of minerals. Optical microscopy was used for mineral identification, mineral/rock characterization and quantification of ore mineral assemblages was also confirmed by XRD. 3D images from SR-μCT have shown spatial distribution of major minerals and crystals of different minerals in the volume of samples. The results obtained shows that the GMS and dolomitic hosted rocks mined from region near Udaipur, Rajasthan contains sulfide mineral phases. SR-μCT facilitates visualization of the association of the various metallic minerals with the host rock. The presence of economically important metallic minerals galena, sphalerite and pyrite found in the samples through SR-μCT has implications on exploration and processing of ores.
Collapse
Affiliation(s)
- A Fatima
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, India.
| | - A S Venkatesh
- Department of Applied Geology, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - R Mukherjee
- Department of Applied Geology, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - A K Agrawal
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - B Singh
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - P S Sarkar
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - Y Kashyap
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - T Shripathi
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, India
| |
Collapse
|
3
|
Abstract
PbS/PVP nanocomposite films with tunable band gap from 0.8 to 1.92 eV.
Collapse
Affiliation(s)
- Mitesh H. Patel
- Dr. K. C. Patel Research and Development Centre
- Charotar University of Science and Technology Changa
- India
| | - Tapas K. Chaudhuri
- Dr. K. C. Patel Research and Development Centre
- Charotar University of Science and Technology Changa
- India
| | - Vaibhav K. Patel
- P. D. Patel Institute of Applied Sciences
- Charotar University of Science and Technology
- India
| | - T. Shripathi
- UGC-DAE Consortium for Scientific Research
- Indore
- India
| | - U. Deshpande
- UGC-DAE Consortium for Scientific Research
- Indore
- India
| | - N. P. Lalla
- UGC-DAE Consortium for Scientific Research
- Indore
- India
| |
Collapse
|
4
|
Fatima A, Kataria S, Baghel L, Guruprasad KN, Agrawal AK, Singh B, Sarkar PS, Shripathi T, Kashyap Y. Synchrotron-based phase-sensitive imaging of leaves grown from magneto-primed seeds of soybean. J Synchrotron Radiat 2017; 24:232-239. [PMID: 28009562 DOI: 10.1107/s1600577516015745] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 07/02/2016] [Accepted: 10/06/2016] [Indexed: 06/06/2023]
Abstract
Experiments were conducted to study the effects of static magnetic fields (SMFs) on the venation network of soybean leaves using the synchrotron-based X-ray micro-imaging technique. The seeds of soybean (Glycine max, variety JS-335) were pretreated with different SMFs from 50 to 300 mT in steps of 50 mT for 1 h. The phase-contrast images obtained showed that, as the strength of the SMF increased, the area, width of the midrib, area of the midrib and minor vein of the middle leaflets of third trifoliate leaves also increased up to the SMF strength of 200 mT (1 h) and decreased thereafter. Quantification of the major conducting vein also showed the differences in the major and minor vein structures of the soybean leaves as compared with control leaves. Further, the phase-retrieval technique has been applied to make the segmentation process easy and to quantify the major and minor veins in the venation network. The width and area of midrib enhancement by pre-treatment with SMF implies an enhancement in the uptake of water, which in turn causes an increased rate of photosynthesis and stomatal conductance.
Collapse
Affiliation(s)
- A Fatima
- UGC-DAE, Consortium for Scientific Research, Indore (MP), India
| | - S Kataria
- School of Life Sciences, DAVV, Khandwa Road, Indore (MP), India
| | - L Baghel
- School of Life Sciences, DAVV, Khandwa Road, Indore (MP), India
| | - K N Guruprasad
- School of Life Sciences, DAVV, Khandwa Road, Indore (MP), India
| | - A K Agrawal
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - B Singh
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - P S Sarkar
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - T Shripathi
- UGC-DAE, Consortium for Scientific Research, Indore (MP), India
| | - Y Kashyap
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| |
Collapse
|
5
|
Rai VN, Rajput P, Jha SN, Bhattacharyya D, Raja Shekhar BN, Deshpande UP, Shripathi T. Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass. J Synchrotron Radiat 2016; 23:1424-1432. [PMID: 27787248 DOI: 10.1107/s1600577516014399] [Citation(s) in RCA: 2] [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] [Received: 06/09/2016] [Accepted: 09/09/2016] [Indexed: 06/06/2023]
Abstract
X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) of Nd-doped phosphate glasses have been studied before and after gamma irradiation. The intensity and the location of the white line peak of the L3-edge XANES of Nd are found to be dependent on the ratio O/Nd in the glass matrix. Gamma irradiation changes the elemental concentration of atoms in the glass matrix, which affects the peak intensity of the white line due to changes in the covalence of the chemical bonds with Nd atoms in the glass (structural changes). Sharpening of the Nd 3d5/2 peak profile in XPS spectra indicates a deficiency of oxygen in the glasses after gamma irradiation, which is supported by energy-dispersive X-ray spectroscopy measurements. The ratio of non-bridging oxygen to total oxygen in the glass after gamma radiation has been found to be correlated to the concentration of defects in the glass samples, which are responsible for its radiation resistance as well as for its coloration.
Collapse
Affiliation(s)
- V N Rai
- Indus Synchrotron Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India
| | - Parasmani Rajput
- Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
| | - S N Jha
- Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
| | - D Bhattacharyya
- Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
| | - B N Raja Shekhar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
| | - U P Deshpande
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
| | - T Shripathi
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
| |
Collapse
|
6
|
John K A, Naduvath J, Mallick S, Pledger JW, Remillard SK, DeYoung PA, Thankamoniamma M, Shripathi T, Philip RR. Electrochemical Synthesis of Novel Zn-Doped TiO 2 Nanotube/ZnO Nanoflake Heterostructure with Enhanced DSSC Efficiency. Nanomicro Lett 2016; 8:381-387. [PMID: 30460296 PMCID: PMC6223692 DOI: 10.1007/s40820-016-0099-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 06/08/2016] [Indexed: 05/19/2023]
Abstract
ABSTRACT The paper reports the fabrication of Zn-doped TiO2 nanotubes (Zn-TONT)/ZnO nanoflakes heterostructure for the first time, which shows improved performance as a photoanode in dye-sensitized solar cell (DSSC). The layered structure of this novel nanoporous structure has been analyzed unambiguously by Rutherford backscattering spectroscopy, scanning electron microscopy, and X-ray diffractometer. The cell using the heterostructure as photoanode manifests an enhancement of about an order in the magnitude of the short circuit current and a seven-fold increase in efficiency, over pure TiO2 photoanodes. Characterizations further reveal that the Zn-TONT is preferentially oriented in [001] direction and there is a Ti metal-depleted interface layer which leads to better band alignment in DSSC. GRAPHICAL ABSTRACT
Collapse
Affiliation(s)
- Aijo John K
- Department of Physics Union Christian College, Aluva, Kerala India
| | - Johns Naduvath
- Department of Metallurgical Engineering and Material Science, Indian Institute of Technology, Mumbai, Maharashtra India
- Present Address: Department of Physics, St. Thomas College, Thrissur, Kerala India
| | - Sudhanshu Mallick
- Department of Metallurgical Engineering and Material Science, Indian Institute of Technology, Mumbai, Maharashtra India
| | | | | | - P. A. DeYoung
- Department of Physics, Hope College, Holland, MI 49423 USA
| | | | - T. Shripathi
- UGC-DAE Consortium for Scientific Research, Indore, Madhya Pradesh India
| | | |
Collapse
|
7
|
Fatima A, Kataria S, Guruprasad KN, Agrawal AK, Singh B, Sarkar PS, Shripathi T, Kashyap Y, Sinha A. Synchrotron X-ray phase contrast imaging of leaf venation in soybean (Glycine max) after exclusion of solar UV (280-400 nm) radiation. J Synchrotron Radiat 2016; 23:795-801. [PMID: 27140160 DOI: 10.1107/s1600577516003507] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 02/29/2016] [Indexed: 06/05/2023]
Abstract
The hydraulic efficiency of a leaf depends on its vascular structure as this is responsible for transport activities. To investigate the effect of exclusion of UVAB and UVB radiation from the solar spectrum on the micro-structure of leaves of soybean (Glycine max, variety JS-335), a field experiment was conducted using synchrotron-based phase contrast imaging (PCI). Plants were grown in specially designed UV exclusion chambers, and wrapped with filters that excluded UVB (280-315 nm) or UVAB (280-400 nm), or transmitted all the ambient solar UV (280-400 nm) radiation (filter control). Qualitative observation of high-resolution X-ray PCI images obtained at 10 keV has shown the differences in major and minor vein structures of the leaves. The mid-rib width of the middle leaflet of third trifoliate leaves, for all treatments, were obtained using quantitative image analysis. The width of the mid-rib of the middle leaflet of third trifoliate leaves of UVB excluded plants was found to be more compared to leaves of filter control plants, which are exposed to ambient UV. The mid-rib or the main conducting vein transports water and sugars to the whole plant; therefore, mid-rib enhancement by the exclusion of solar UV radiation possibly implies enhancement in the leaf area which in turn causes an increased rate of photosynthesis.
Collapse
Affiliation(s)
- A Fatima
- UGC-DAE, Consortium for Scientific Research, University Campus, Khandwa Road, Indore (MP), India
| | - S Kataria
- School of Life Sciences, DAVV, Khandwa Road, Indore (MP), India
| | - K N Guruprasad
- School of Life Sciences, DAVV, Khandwa Road, Indore (MP), India
| | - A K Agrawal
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - B Singh
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - P S Sarkar
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - T Shripathi
- UGC-DAE, Consortium for Scientific Research, University Campus, Khandwa Road, Indore (MP), India
| | - Y Kashyap
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - A Sinha
- Neutron and X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| |
Collapse
|
8
|
Senapati S, Thakur R, Verma SP, Duggal S, Mishra DP, Das P, Shripathi T, Kumar M, Rana D, Maiti P. Layered double hydroxides as effective carrier for anticancer drugs and tailoring of release rate through interlayer anions. J Control Release 2016; 224:186-198. [PMID: 26774219 DOI: 10.1016/j.jconrel.2016.01.016] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [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: 09/16/2015] [Revised: 12/28/2015] [Accepted: 01/11/2016] [Indexed: 10/24/2022]
Abstract
Hydrophobic anticancer drug, raloxifene hydrochloride (RH) is intercalated into a series of magnesium aluminum layered double hydroxides (LDHs) with various charge density anions through ion exchange technique for controlled drug delivery. The particle nature of the LDH in presence of drug is determined through electron microscopy and surface morphology. The release of drug from the RH intercalated LDHs was made very fast or sustained by altering the exchangeable anions followed by the modified Freundlich and parabolic diffusion models. The drug release rate is explained from the interactions between the drug and LDHs along with order-disorder structure of drug intercalated LDHs. Nitrate bound LDH exhibits greater interaction with drug and sustained drug delivery against the loosely interacted phosphate bound LDH-drug, which shows fast release. Cell viability through MTT assay suggests drug intercalated LDHs as better drug delivery vehicle for cancer cell line against poor bioavailability of the pure drug. In vivo study with mice indicates the differential tumor healing which becomes fast for greater drug release system but the body weight index clearly hints at damaged organ in the case of fast release system. Histopathological experiment confirms the damaged liver of the mice treated either with pure drug or phosphate bound LDH-drug, fast release system, vis-à-vis normal liver cell morphology for sluggish drug release system with steady healing rate of tumor. These observations clearly demonstrate that nitrate bound LDH nanoparticle is a potential drug delivery vehicle for anticancer drugs without any side effect.
Collapse
Affiliation(s)
- Sudipta Senapati
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221 005, India
| | - Ravi Thakur
- Cell Death Research Laboratory, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Shiv Prakash Verma
- Centre for Genetic Disorders, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Shivali Duggal
- Cell Death Research Laboratory, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Durga Prasad Mishra
- Cell Death Research Laboratory, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Parimal Das
- Centre for Genetic Disorders, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - T Shripathi
- UGC-DAE CSR, University Campus, Khandwa Road, Indore 452 001, India
| | - Mohan Kumar
- Department of Pathology, Institute of Medical Science, Banaras Hindu University, Varanasi 221005, India
| | - Dipak Rana
- Industrial Membrane Research Institute, Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur St., Ottawa, ON KIN 6N5, Canada
| | - Pralay Maiti
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221 005, India.
| |
Collapse
|
9
|
Fatima A, Kulkarni VK, Banda NR, Agrawal AK, Singh B, Sarkar PS, Tripathi S, Shripathi T, Kashyap Y, Sinha A. Non-destructive evaluation of teeth restored with different composite resins using synchrotron based micro-imaging. J Xray Sci Technol 2016; 24:119-132. [PMID: 26890899 DOI: 10.3233/xst-160530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
BACKGROUND Application of high resolution synchrotron micro-imaging in microdefects studies of restored dental samples. OBJECTIVE The purpose of this study was to identify and compare the defects in restorations done by two different resin systems on teeth samples using synchrotron based micro-imaging techniques namely Phase Contrast Imaging (PCI) and micro-computed tomography (MCT). With this aim acquired image quality was also compared with routinely used RVG (Radiovisiograph). METHODS Crowns of human teeth samples were fractured mechanically involving only enamel and dentin, without exposure of pulp chamber and were divided into two groups depending on the restorative composite materials used. Group A samples were restored using a submicron Hybrid composite material and Group B samples were restored using a Nano-Hybrid restorative composite material. Synchrotron based PCI and MCT was performed with the aim of visualization of tooth structure, composite resin and their interface. RESULTS The quantitative and qualitative comparison of phase contrast and absorption contrast images along with MCT on the restored teeth samples shows comparatively large number of voids in Group A samples. CONCLUSIONS Quality assessment of dental restorations using synchrotron based micro-imaging suggests Nano-Hybrid resin restorations (Group B) are better than Group A.
Collapse
Affiliation(s)
- A Fatima
- UGC- DAE Consortium for Scientific Research, University Campus, Indore (M.P.), India
| | - V K Kulkarni
- Department of Pedodontics and Preventive Dentistry, Modern Dental College, Indore (M.P.), India
| | - N R Banda
- Department of Pedodontics and Preventive Dentistry, Modern Dental College, Indore (M.P.), India
| | - A K Agrawal
- Neutron & X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - B Singh
- Neutron & X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - P S Sarkar
- Neutron & X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - S Tripathi
- UGC- DAE Consortium for Scientific Research, University Campus, Indore (M.P.), India
| | - T Shripathi
- UGC- DAE Consortium for Scientific Research, University Campus, Indore (M.P.), India
| | - Y Kashyap
- Neutron & X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - A Sinha
- Neutron & X-ray Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| |
Collapse
|
10
|
Gawai UP, Khawal HA, Shripathi T, Dole BN. A study on the synthesis, pair distribution function and diverse properties of cobalt doped ZnS nanowires. CrystEngComm 2016. [DOI: 10.1039/c5ce02253c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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
The fundamental atomic structure of pure and Co doped ZnS nanowires has been studied using pair distribution function (PDF) analysis. It was confirmed that samples have hexagonal (wurtzite) structure. The interatomic distance was calculated using PDF analysis. It was observed that the energy band gap decreases as Co content increases.
Collapse
Affiliation(s)
- U. P. Gawai
- Advanced Materials Research Laboratory
- Department of Physics
- Dr. Babasaheb Ambedkar Marathwada University
- Aurangabad 431 004, India
| | - H. A. Khawal
- Advanced Materials Research Laboratory
- Department of Physics
- Dr. Babasaheb Ambedkar Marathwada University
- Aurangabad 431 004, India
| | | | - B. N. Dole
- Advanced Materials Research Laboratory
- Department of Physics
- Dr. Babasaheb Ambedkar Marathwada University
- Aurangabad 431 004, India
| |
Collapse
|
11
|
Rathore PS, Patidar R, Shripathi T, Thakore S. Magnetically separable core–shell iron oxide@nickel nanoparticles as high-performance recyclable catalysts for chemoselective reduction of nitroaromatics. Catal Sci Technol 2015. [DOI: 10.1039/c4cy00673a] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A magnetically separable core–shell iron oxide@nickel nanocatalyst was synthesized, characterized and applied for the aromatic nitro group reduction.
Collapse
Affiliation(s)
- Puran Singh Rathore
- Department of Chemistry
- Faculty of Science
- The M. S. University of Baroda
- Vadodara
- India
| | - Rajesh Patidar
- Analytical Discipline and CIF
- Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI)
- Bhavnagar
- India
| | - T. Shripathi
- UGC-DAE Consortium for Scientific Research
- Indore 452 001
- India
| | - Sonal Thakore
- Department of Chemistry
- Faculty of Science
- The M. S. University of Baroda
- Vadodara
- India
| |
Collapse
|
12
|
Reshi HA, Pillai S, Yadav RS, Para TA, Deshpande UP, Shripathi T, Shelke V. Kondo-like electronic transport and ferromagnetic cluster-glass behavior in La0.7Sr0.3MnO3 nanostructures. RSC Adv 2015. [DOI: 10.1039/c5ra12042j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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
We have studied the electronic transport and magnetic properties of a nanocrystalline La0.7Sr0.3MnO3 system. We observed low temperature Kondo effect with magnetic cluster behavior.
Collapse
Affiliation(s)
- Hilal Ahmad Reshi
- Novel Materials Research Laboratory
- Department of Physics
- Barkatullah University
- Bhopal 462026
- India
| | - Shreeja Pillai
- Novel Materials Research Laboratory
- Department of Physics
- Barkatullah University
- Bhopal 462026
- India
| | - Rama Shanker Yadav
- Novel Materials Research Laboratory
- Department of Physics
- Barkatullah University
- Bhopal 462026
- India
| | - Touseef Ahmad Para
- Novel Materials Research Laboratory
- Department of Physics
- Barkatullah University
- Bhopal 462026
- India
| | - U. P. Deshpande
- UGC-DAE Consortium for Scientific Research
- DAV Campus
- Indore 452017
- India
| | - T. Shripathi
- UGC-DAE Consortium for Scientific Research
- DAV Campus
- Indore 452017
- India
| | - Vilas Shelke
- Novel Materials Research Laboratory
- Department of Physics
- Barkatullah University
- Bhopal 462026
- India
| |
Collapse
|
13
|
Roy D, Tiwari N, Mukhopadhyay K, Shripathi T, Saxena AK. The Role of Functional Moieties on Carbon Nanotube Surfaces in Solar Energy Conversion. Chemphyschem 2014; 15:3839-47. [DOI: 10.1002/cphc.201402268] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Indexed: 11/08/2022]
|
14
|
Mogal SI, Gandhi VG, Mishra M, Tripathi S, Shripathi T, Joshi PA, Shah DO. Single-Step Synthesis of Silver-Doped Titanium Dioxide: Influence of Silver on Structural, Textural, and Photocatalytic Properties. Ind Eng Chem Res 2014. [DOI: 10.1021/ie404230q] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sajid I. Mogal
- Department of Chemical Engineering & Shah-Schulman Center for Surface Science and Nanotechnology, Faculty of Technology, Dharmsinh Desai University, College Road, Nadiad 387 001, Gujarat, India
| | - Vimal G. Gandhi
- Department of Chemical Engineering & Shah-Schulman Center for Surface Science and Nanotechnology, Faculty of Technology, Dharmsinh Desai University, College Road, Nadiad 387 001, Gujarat, India
| | - Manish Mishra
- Department of Chemical Engineering & Shah-Schulman Center for Surface Science and Nanotechnology, Faculty of Technology, Dharmsinh Desai University, College Road, Nadiad 387 001, Gujarat, India
| | - Shilpa Tripathi
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452 001 (MP), India
| | - T. Shripathi
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452 001 (MP), India
| | - Pradyuman A. Joshi
- Department of Chemical Engineering & Shah-Schulman Center for Surface Science and Nanotechnology, Faculty of Technology, Dharmsinh Desai University, College Road, Nadiad 387 001, Gujarat, India
| | - Dinesh O. Shah
- Department of Chemical Engineering & Shah-Schulman Center for Surface Science and Nanotechnology, Faculty of Technology, Dharmsinh Desai University, College Road, Nadiad 387 001, Gujarat, India
- Department
of Chemical Engineering and Department of Anesthesiology, University of Florida, Gainesville, Florida 32611, United States
| |
Collapse
|
15
|
Parida SK, Medicherla VRR, Bag P, Rawat R, Shripathi T, Sahadev N, Biswas D, Adhikary G, Maiti K. Virtual Bound State Formation in CuNi Alloys. ACTA ACUST UNITED AC 2014. [DOI: 10.1166/asl.2014.5405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
16
|
Das SC, Majumdar A, Katiyal S, Shripathi T, Hippler R. Development of fast heating electron beam annealing setup for ultra high vacuum chamber. Rev Sci Instrum 2014; 85:025107. [PMID: 24593396 DOI: 10.1063/1.4865458] [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] [Indexed: 06/03/2023]
Abstract
We report the design and development of a simple, electrically low powered and fast heating versatile electron beam annealing setup (up to 1000 °C) working with ultra high vacuum (UHV) chamber for annealing thin films and multilayer structures. The important features of the system are constant temperature control in UHV conditions for the temperature range from room temperature to 1000 ºC with sufficient power of 330 W, at constant vacuum during annealing treatment. It takes approximately 6 min to reach 1000 °C from room temperature (∼10(-6) mbar) and 45 min to cool down without any extra cooling. The annealing setup consists of a UHV chamber, sample holder, heating arrangement mounted on suitable UHV electrical feed-through and electronic control and feedback systems to control the temperature within ±1 ºC of set value. The outside of the vacuum chamber is cooled by cold air of 20 °C of air conditioning machine used for the laboratory, so that chamber temperature does not go beyond 50 °C when target temperature is maximum. The probability of surface oxidation or surface contamination during annealing is examined by means of x-ray photoelectron spectroscopy of virgin Cu sample annealed at 1000 °C.
Collapse
Affiliation(s)
- Sadhan Chandra Das
- UGC-DAE Consortium For Scientific Research, University Campus, Khandwa Road, Indore 452 001, MP, India
| | - Abhijit Majumdar
- Institute of Physics, University of Greifswald, Felix Hausdroff Str. 6, Germany
| | - Sumant Katiyal
- School of Electronics, Devi Ahilya University, Indore 452001, MP, India
| | - T Shripathi
- UGC-DAE Consortium For Scientific Research, University Campus, Khandwa Road, Indore 452 001, MP, India
| | - R Hippler
- Institute of Physics, University of Greifswald, Felix Hausdroff Str. 6, Germany
| |
Collapse
|
17
|
Tripathi J, Tripathi S, Keller J, Das K, Shripathi T. Degradation study on structural and optical properties of annealed Rhodamine B doped poly(vinyl) alcohol films. Polym Degrad Stab 2013. [DOI: 10.1016/j.polymdegradstab.2012.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
18
|
Jacob R, Geethu R, Shripathi T, Ganesan V, Deshpande UP, Tripathi S, Pradeep B, Philip RR. Structural Studies and Valence Band Splitting Parameters in Ordered Vacancy Compound AgGa7Se12. J Inorg Organomet Polym Mater 2012. [DOI: 10.1007/s10904-012-9799-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
19
|
Rijith S, Anirudhan TS, Shripathi T. Evaluation of Iron(III) Chelated Polymer Grafted Lignocellulosics for Arsenic(V) Adsorption in a Batch Reactor System. Ind Eng Chem Res 2012. [DOI: 10.1021/ie300732t] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. Rijith
- Department of Chemistry, University of Kerala, Kariavattom Campus,
Thiruvananthapuram 695 581, India
| | - T. S. Anirudhan
- Department of Chemistry, University of Kerala, Kariavattom Campus,
Thiruvananthapuram 695 581, India
| | - T. Shripathi
- UGC-DAE−CSR,
University Campus, Khandawa Road, Indore-452017, India
| |
Collapse
|
20
|
Das SC, Majumdar A, Shripathi T, Hippler R. Note: development of fast heating inert gas annealing apparatus operated at atmospheric pressure. Rev Sci Instrum 2012; 83:046109. [PMID: 22559595 DOI: 10.1063/1.4704836] [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: 05/31/2023]
Abstract
Here, we report the development of a simple, small, fast heating, and portable, homemade, inert gas (Ar) atmospheric annealing setup. Instead of using a conventional heating element, a commercial soldering rod having an encapsulated fast heating heater is used here. The sample holder is made of a block of stainless steel. It takes 200 s to reach 700 °C, and 10 min to cool down. The probability of oxidation or surface contamination has been examined by means of x ray photoelectron spectroscopy of virgin Cu sample after annealing at 600 °C. In addition, we compare the annealing of a hydrogenated carbon nitride film (HCN(x)) in both a conventional vacuum and our newly developed ambient Ar atmosphere setup.
Collapse
Affiliation(s)
- S C Das
- UGC-DAE Consortium for Scientific Research, Indore 452017, MP, India
| | | | | | | |
Collapse
|
21
|
Tiwari VK, Shripathi T, Lalla NP, Maiti P. Nanoparticle induced piezoelectric, super toughened, radiation resistant, multi-functional nanohybrids. Nanoscale 2012; 4:167-75. [PMID: 22068838 DOI: 10.1039/c1nr11009h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We have developed multifunctional nanohybrids of poly(vinylidene fluoride-co-chlorotrifluoroethylene) (CTFE) with a small percentage of surface modified inorganic layered silicate showing dramatic improvement in toughness, radiation resistant and piezoelectric properties vis-à-vis pristine polymer. Massive intercalation (d(001) 1.8 → 3.9 nm) of polymer inside the nanoclay galleries and unique crystallization behavior of the fluoropolymer on the surface of individual silicate layer has been reported. Toughness in the nanohybrid increases more than three orders of magnitude as compared to pure CTFE. High energy radiation (80 MeV Si(+7)) causes chain session, amorphization and creates olefinic bonds in the pure polymer while the nanohybrids are radiation resistant at a similar dose. Nanoclay induces the metastable piezoelectric β-phase in CTFE, suitable for sensor and actuator application. Molecular level changes after irradiation and controlled morphology for smart membrane have been confirmed by using spectroscopy, sol-gel technique, surface morphology studies and in situ residual gas analysis.
Collapse
Affiliation(s)
- Vimal K Tiwari
- School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
| | | | | | | |
Collapse
|
22
|
Okram GS, Soni A, Adroja DT, Lalla NP, Shripathi T. High coercive field and magnetization reversal in core-shell cum nanotwin driven Ni/NiO nanospheres. J Nanosci Nanotechnol 2011; 11:2632-2635. [PMID: 21449442 DOI: 10.1166/jnn.2011.2696] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report here nanotwin-core-shell Ni(core)NiO(shell) spheres of average size 25 nm prepared through polyol method. They exhibit high coercive field at 2 K, sharp peak at approximately 20 K in magnetization curve and magnetization reversal. Interestingly, exchange bias due to antiferromagnetic NiO shell is absent. Among other possibilities, anisotropy variations due to particle size distribution and twinning associated with disorder appear to play an important role. Further, magnetic interactions of twinned bigger spheres, which may also act as superferrimagnetic-like Ni multilayer cores, with superparamagnetic Ni of smaller spheres, might be the additional causes. These nanostructures therefore seem to have potential interest in memory effect.
Collapse
Affiliation(s)
- Gunadhor S Okram
- UGC-DAE Consortium for Scientific Research, Indore 452001, MP, India
| | | | | | | | | |
Collapse
|
23
|
Yadav R, Dobal P, Shripathi T, Katiyar RS, Srivastava ON. Effect of Growth Temperature on Bamboo-shaped Carbon-Nitrogen (C-N) Nanotubes Synthesized Using Ferrocene Acetonitrile Precursor. Nanoscale Res Lett 2008; 4:197-203. [PMID: 20596277 PMCID: PMC2894332 DOI: 10.1007/s11671-008-9225-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2008] [Accepted: 11/24/2008] [Indexed: 05/06/2023]
Abstract
This investigation deals with the effect of growth temperature on the microstructure, nitrogen content, and crystallinity of C-N nanotubes. The X-ray photoelectron spectroscopic (XPS) study reveals that the atomic percentage of nitrogen content in nanotubes decreases with an increase in growth temperature. Transmission electron microscopic investigations indicate that the bamboo compartment distance increases with an increase in growth temperature. The diameter of the nanotubes also increases with increasing growth temperature. Raman modes sharpen while the normalized intensity of the defect mode decreases almost linearly with increasing growth temperature. These changes are attributed to the reduction of defect concentration due to an increase in crystal planar domain sizes in graphite sheets with increasing temperature. Both XPS and Raman spectral observations indicate that the C-N nanotubes grown at lower temperatures possess higher degree of disorder and higher N incorporation.
Collapse
Affiliation(s)
- RamManohar Yadav
- Department of Physics, Banaras Hindu University, Varanasi, 221005, India
- Department of Physics, VSSD College, Kanpur, 208002, India
| | | | - T Shripathi
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452017, India
| | - RS Katiyar
- Department of Physics, University of Puerto Rico, San Juan, PR, USA
| | - ON Srivastava
- Department of Physics, Banaras Hindu University, Varanasi, 221005, India
| |
Collapse
|
24
|
Brajpuriya R, Tripathi S, Sharma A, Chaudhari SM, Shripathi T. Structural influence on the magnetic and electronic properties of annealed Fe/Al multilayers. J Nanosci Nanotechnol 2008; 8:4116-4120. [PMID: 19049186 DOI: 10.1166/jnn.2008.an47] [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: 05/27/2023]
Abstract
Temperature dependent magnetic and electronic properties of electron beam evaporated Fe/Al multilayer samples (MLS) with an average composition of Fe0.70A1(0.30) (MLS-A) and Fe0.50Al0.50 (MLS-B) have been investigated. A ferromagnetic behaviour in MLS-A and nonmagnetic behaviour in MLS-B is obtained after annealing the multilayers at 400 degrees C. The different magnetic behaviours can be interpreted in terms of constant increase of Fe-3d and Al-3sp hybridization accompanied by an increased de-localization of the d-electrons participating in the strong bonding of Fe with Al leading to formation of different Fe-Al phases (Fe3Al in MLS-A) and (FeAl in MLS-B) as suggested from valence band photoemission and X-ray diffraction measurements.
Collapse
Affiliation(s)
- R Brajpuriya
- University Grant Commission-Department of Atomic Energy Consortium for Scientific research, University Campus, Indore 452017, India
| | | | | | | | | |
Collapse
|
25
|
Tripathi S, Brajpuriya R, Sharma A, Soni A, Okram GS, Chaudhari SM, Shripathi T. Thickness dependent structural, electronic, and optical properties of Ge nanostructures. J Nanosci Nanotechnol 2008; 8:2955-2963. [PMID: 18681031 DOI: 10.1166/jnn.2008.151] [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] [Indexed: 05/26/2023]
Abstract
In the present paper, we have investigated structural, optical as well as electronic properties of electron beam evaporated Ge thin films having layer thicknesses ranging from ultra-thin (5 nm) to thick (200 nm). The Raman spectra show that all peaks are shifted towards lower wave number as compared to their bulk counterparts and are considered as a signature of nanostructure formation and quantum confinement effect. The Raman line exhibits transformation from nanocrystalline to microcrystalline phase with a reduction in blue shift of peak position with increase in Ge film thickness (>5 nm). Similarly, the optical absorption spectra corresponding to these films also show reduction in blue shift effect, although Ge 5 nm film shows the absorption behaviour quite different from higher thickness films. The corresponding band gap values obtained from absorption measurements are much larger than bulk Ge and are mainly attributed to the effect of quantum confinement as expected for small size particles calculated from GIXRD patterns. AFM data in each case are correlated and discussed with structural as well as optical results to support the effect of growth morphology on the above-mentioned observations. The results are further supported by photoelectron spectroscopy (PES), photoluminescence (PL) and resistivity measurements and are interpreted in terms of crystallinity and quantum confinement effect.
Collapse
Affiliation(s)
- S Tripathi
- UGC-DAE Consortium for Scientific Research, University Campus, Indore 452017, India
| | | | | | | | | | | | | |
Collapse
|
26
|
Basavaraja S, Vijayanand H, Venkataraman A, Deshpande UP, Shripathi T. Characterization of γ-Fe2O3 Nanoparticles Synthesized Through Self-Propagating Combustion Route. ACTA ACUST UNITED AC 2007. [DOI: 10.1080/15533170701465861] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
27
|
Sharma A, Tripathi S, Brajpuriya R, Shripathi T, Chaudhari SM. Thickness dependent structural, magnetic and transport properties of nanostructured cobalt thin films. J Nanosci Nanotechnol 2007; 7:2041-5. [PMID: 17654988 DOI: 10.1166/jnn.2007.765] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
This paper presents structural, magnetic, and transport properties measurements carried out on Co thin film as a function of thickness. The structure of the Co thin film changes from amorphous to nano-crystalline with the increase in film thickness. The corresponding magnetic and transport measurements show drastic changes in coercivity, saturation field and resistivity value as a function of Co film thickness. Observed magnetization and resistivity behaviour is mainly attributed to the (i) Change in crystal structure, (ii) stress relaxation, (iii) grain growth as revealed by X-ray diffraction (XRD), and atomic force microscopy (AFM) measurements.
Collapse
Affiliation(s)
- A Sharma
- University Grant Commission - Department of Atomic Energy Consortium for Scientific Research, University Campus, Indore 452017, India
| | | | | | | | | |
Collapse
|
28
|
Yadav RM, Shripathi T, Srivastava A, Srivastava ON. Effect of ferrocene concentration on the synthesis of bamboo-shaped carbon-nitrogen nanotube bundles. J Nanosci Nanotechnol 2005; 5:820-4. [PMID: 16010946 DOI: 10.1166/jnn.2005.102] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We have investigated the effect of ferrocene concentration on the synthesis of carbon-nitrogen (C-N) nanotubes. The bamboo-shaped carbon-nitrogen nanotubes were synthesized by spray pyrolysis of Fe(C5H5)2 and CH3CN solution using argon as a carrier gas at the optimum temperature of approximately 900 degrees C. The effect of ferrocene concentration on the length and concentration of nitrogen in nanotubes was studied. Micro-structural features of the nanotubes were monitored employing scanning and transmission electron microscopic techniques. SEM studies reveal that with decreasing ferrocene concentration from 25 mg ml(-1) to 5 mg ml(-1), the length of the nanotubes vary from 80 microm to 430 microm. A feasible growth model has been described and discussed. X-ray photoelectron spectroscopic studies have confirmed the formation of nitrogen-doped carbon nanotubes. These studies reveal that the nitrogen concentration in the nanotubes decreases with the increase of ferrocene concentration. The present synthesis route also provides means of producing carbon nanotubes with different concentrations of nitrogen.
Collapse
Affiliation(s)
- Ram Manohar Yadav
- Department of Physics, Banaras Hindu University, Varanasi 221005, India
| | | | | | | |
Collapse
|
29
|
|