Biomolecular Electronics and Nanotechnology

Chandigarh, India

Biomolecular Electronics and Nanotechnology

Chandigarh, India

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Kukkar D.,Biomolecular Electronics and Nanotechnology | Kaur H.,Biomolecular Electronics and Nanotechnology | Kaur I.,Biomolecular Electronics and Nanotechnology | Singh J.,Panjab University | Bharadwaj L.M.,Biomolecular Electronics and Nanotechnology
Advanced Science Letters | Year: 2012

In this study quantum dots encapsulated polystyrene microcapsules were arrayed for multianalyte platform applications. Quantum dots were encapsulated using solvent induced annealing of hollow polystyrene particles prepared by liquid nitrogen freezing and drying under vacuum. The microcapsules were characterized by field emission scanning electron microscopy, transmission electron microscopy, dynamic light scattering, photoluminescence spectroscopy and confocal laser scanning microscopy. Average size of microcapsules was 1.8365 μm with polydispersity index of 0.562. Electron microscopic analysis revealed presence of quantum dots inside the void of individual microcapsules. Z-stacking and intensity profiling with confocal microscopy established encapsulation of quantum dots in majority of the capsules. The fluorescent capsules were covalently immobilized on succinimidyl trans-4(maleimidyl methyl)cyclohexane 1-carboxylate/thioglycolic acid treated aminated patterns created on glass substrate. These arrayed capsules have potential applications for sensing of multiple analytes. © 2012 American Scientific Publishers. All rights reserved.


Kukkar D.,Biomolecular Electronics and Nanotechnology | Kaur I.,Biomolecular Electronics and Nanotechnology | Singh J.,Panjab University | Bharadwaj L.M.,Biomolecular Electronics and Nanotechnology
World Academy of Science, Engineering and Technology | Year: 2011

Polymeric microreactors have emerged as a new generation of carriers that hold tremendous promise in the areas of cancer therapy, controlled delivery of drugs, for removal of pollutants etc. Present work reports a simple and convenient methodology for synthesis of polystyrene and poly caprolactone microreactors. An aqueous suspension of carboxylated (1μm) polystyrene latex particles was mixed with toluene solution followed by freezing with liquid nitrogen. Freezed particles were incubated at -20°C and characterized for formation of voids on the surface of polymer microspheres by Field Emission Scanning Electron Microscope. The hollow particles were then overnight incubated at 40°C with unfunctionalized quantum dots (QDs) in 5:1 ratio. QDs Encapsulated polystyrene microcapsules were characterized by fluorescence microscopy. Likewise Poly ε-caprolactone microreactors were prepared by micro-volcanic rupture of freeze dried microspheres synthesized using emulsification of polymer with aqueous Poly vinyl alcohol and freezed with liquid nitrogen. Microreactors were examined with Field Emission Scanning Electron Microscope for size and morphology. Current study is an attempt to create hollow polymer particles which can be employed for microencapsulation of nanoparticles and drug molecules.


Kumar S.,Biomolecular Electronics and Nanotechnology | Kaur H.,Biomolecular Electronics and Nanotechnology | Kaur I.,Biomolecular Electronics and Nanotechnology | Dharamvir K.,Panjab University | Bharadwaj L.M.,Biomolecular Electronics and Nanotechnology
Journal of Materials Science | Year: 2012

Low intensity magnetic fields (22mT) rendered by a pair of bar magnets have been used to achieve in situ precise orientation of multiwalled carbon nanotubes (MWCNTs) and their directional deposition on solid substrates. The nanotubes were imparted magnetic characteristics through Fe 3O 4 (magnetite) nanoparticles covalently attached to their surface. The side walls of nanotubes were first acid oxidized with H 2SO 4/HNO 3 (3:1 v/v) mixture and amine-functionalized magnetic nanoparticles were then interfaced to ends and side walls of the nanotubes through covalent linkages in the presence of a zero length cross linker, 1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide. Fourier transformed infrared spectroscopic investigations affirmed the functionalization of nanostructures and formation of a magnetic nanohybrid. Transmission electron microscopy results revealed the attachment of nanoparticles along the side walls of MWCNTs. A flow cell was utilized to orient magnetic nanohybrid in the desired direction and also to create thin films of aligned MWCNTs. Further, directional assembly of magnetic MWCNTs at different orientation angles on solid substrates was studied by field emission scanning electron microscopy and optical microscopy. The procedure can be scaled to align CNTs on large surface areas for numerous applications, e.g., nanosensors, field emitters, and composites. © 2011 Springer Science+Business Media, LLC.

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