Nupur Biswas
Saha Institute of Nuclear Physics
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Publication
Featured researches published by Nupur Biswas.
RSC Advances | 2013
Srabanti Ghosh; Aparna Datta; Nupur Biswas; Alokmay Datta; Abhijit Saha
We demonstrate a unique single-pot synthesis of self-organized structures of CdS/dendrimer nanocomposites having long-range correlation by adopting a radiation-induced technique. The present method has been able to produce long-range chain-like networks of CdS nanoparticles of high stability within the dendrimer matrix with particle size monodispersity ∼6%, as visualized with atomic force microscopy, while individual particles are characterized by transmission electron microscopy, photoluminescence, absorption spectroscopy and dynamic light scattering. Results point to a possible mechanism of long-range self-organization from the nanometer to micrometer length scales, where the self-organization is controlled by surface functionality of the dendrimer molecule, solvent and crystal phase of the CdS nanocrystals. The present investigation opens up new potential routes to manipulate semiconductor nanocomposites for optical diagnostics and for applications that require dendrimer nanocomposites with a long-range order.
SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012 | 2013
Nupur Biswas; Alokmay Datta
Dried droplets of polymer solutions carries the self-assembly behavior of polymer molecules by forming various patterns. Pattern formation is a consequence of deposition of molecules depending on motion of the contact line during the drying process. The contact line motion depends on initial polymer concentrations and hence entanglement. Thus depending on entanglement the patterns represent the ‘particle’ like or ‘collective’ behavior of polymer molecules.
Beilstein Journal of Nanotechnology | 2016
Nupur Biswas; Sreeja Chakraborty; Alokmay Datta; Munna Sarkar; Mrinmay K. Mukhopadhyay; Mrinal K. Bera; Hideki Seto
Summary We have explored morphology of DNA molecules bound with Cu complexes of piroxicam (a non-steroidal anti-inflammatory drug) molecules under one-dimensional confinement of thin films and have studied the effect of counterions present in a buffer. X-ray reflectivity at and away from the Cu K absorption edge and atomic force microscopy studies reveal that confinement segregates the drug molecules preferentially in a top layer of the DNA film, and counterions enhance this segregation.
SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011 | 2012
Nupur Biswas; Sreeja Chakraborty; Alokmay Datta; Munna Sarkar; Mrinmay K. Mukhopadhyay; Mrinal K. Bera; Hideki Seto
Molecules of natural polyelectrolyte DNA, fully neutralized in brine water, show formation of well defined thin films under nano-confinement. The X-ray scattering studies reveal film thickness ∼ 1.5 times of DNA chain width, indicating lateral entanglement whereas the film has self-affine correlation in plane when probing scale is small (with Atomic Force Microscopy) but when probed at large length scale (with diffuse X-ray scattering) they show liquid like correlation due to quasi-equilibrium condition.
Chemical Physics Letters | 2012
Nupur Biswas; Masatoshi Ichikawa; Alokmay Datta; Yuko Sato; Miho Yanagisawa; Kenichi Yoshikawa
Chemical Physics Letters | 2012
Nupur Biswas; Alokmay Datta
Journal of Nanoscience and Nanotechnology | 2009
Ayesha Rahman; Nupur Biswas; Christian Ulrichs; Carmen Büttner; Ratan Lal Bramhachary; Arunava Goswami; Alokmay Datta
Journal of Nanoscience and Nanotechnology | 2010
Nupur Biswas; Ayesha Rahman; Alokmay Datta; Arunava Goswami; Ratan Lal Bramhachary
Journal of Biological Physics | 2013
Sumistha Das; Alokmay Datta; Smita Mukherjee; Nupur Biswas; Arunava Goswami
arXiv: Soft Condensed Matter | 2014
Nupur Biswas; Alokmay Datta