@article { ISI:000230823200014, title = {Growth of PbS nanopyramidal particulate films for potential applications in quantum-dot photovoltaics and nanoantennas}, journal = {Materials Research Bulletin }, volume = {40}, number = {8}, year = {2005}, month = {AUG}, pages = {1353-1360}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

We report a simple interfacial process called the liquid-liquid interface reaction technique (LLIRT) that leads to the formation of nanosized PbS particulate films with hitherto unreported pyramidal morphology. The resultant PbS films were characterized by transmission electron microscopy (TEM) with selected area electron diffraction (SAED), X-ray diffractometery (XRD), atomic force microscopy (AFM), near field scanning optical microscopy (NSOM) and UV-vis spectroscopy. The pyramidal morphology is speculated to originate from the preferred orientation of the 2 2 0 plane of cubic PbS. Our nanopyramidal PbS particulate films display remarkably sharp excitonic peak centered around 656 nm that accounts for a band gap of 1.8 eV suggesting, in turn, their potential application in QD photovoltaics. Interestingly, the feasibility of such nanopyramids to potentially act as nanoantennas (as revealed by the NSOM) is also suggested. (c) 2005 Elsevier Ltd. All rights reserved.

}, keywords = {Atomic force microscopy, Chemical synthesis, Electron microscopy, Nanostructures, Optical properties}, issn = {0025-5408}, doi = {10.1016/j.materresbull.2005.04.018}, author = {Hawaldar, Ranjit R. and Mulik, Uttam P. and Patil, K. and Pasricha, R. and Sathaye, S. and Lewis, A. and Amalnerkar, Dinesh P.} } @article { ISI:000267662600010, title = {Effect of cultural conditions and media constituents on production of penicillin V acylase and CTAB treatment to enhance whole-cell enzyme activity of rhodotorula aurantiaca (NCIM 3425)}, journal = {Applied Biochemistry and Biotechnology}, volume = {157}, number = {3}, year = {2009}, month = {JUN}, pages = {463-472}, publisher = {HUMANA PRESS INC}, address = {999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA}, abstract = {

Penicillin V acylase (PVA) is a pharmaceutically important enzyme as it plays a vital role in the manufacture of semi-synthetic beta-lactam antibiotics. Rhodotorula aurantiaca (NCIM 3425) produced high levels of intracellular penicillin V acylase after 18 h at pH 8.0 and temperature 27 degrees C. Fructose was the best carbon source for PVA production, whereas tryptone was the best nitrogen source to produce the enzyme up to 170 and 1,088 IU/l of culture, respectively. Additionally, the cell-bound PVA activity was enhanced on treatment with cationic detergent. Whole-cell activity was found to be doubled (204\%) on treatment of 0.01 g dry weight of cells with 50 mu g/ml solution of N-cetyl-N,N,N-trimethylammoniumbromide at pH 8.0 for 1 h at room temperature. Atomic force microscopy images of permeabilized cells show perturbation in the cell wall and offer first-ever visual illustration of surface structure modifications that occur during permeabilization of R. aurantiaca cells leading to enhancement in activity of intracellular enzyme.

}, keywords = {Atomic force microscopy, Intracellular enzyme, Penicillin Vacylase, Permeabilization, Rhodotorula aurantiaca}, issn = {0273-2289}, doi = {10.1007/s12010-008-8294-0}, author = {Kumar, Atul and Singh, Sanjay and Poddar, Pankaj and Prabhune, Asmita and Pundle, Archana} } @article { ISI:000268215200019, title = {Vapour sensing with conductive polymer nanocomposites (CPC): polycarbonate-carbon nanotubes transducers with hierarchical structure processed by spray layer by layer}, journal = {Sensors and Actuators B-Chemical}, volume = {140}, number = {2}, year = {2009}, month = {JUL}, pages = {451-460}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

The development of conductive polymer nanocomposite (CPC) sensors for volatile organic compounds (VOC) detection has been carried out using a spray layer by layer (LbL) process. This technique was successfully used to hierarchically structure polycarbonate-multiwall carbon nanotubes (PC-CNT) solutions into a double percolated architecture as attested by atomic force microscopy (AFM) and optical microscopy (OM). PC-CNT vapour sensing behaviour was investigated as a function of CNT content, films thickness, vapour flow and vapours solubility parameter. The response ranking A(r)(toluene)\>A(r)(methanol)\>A(r)(water)of PC-CNT was found to be coherent with kappa(12) Flory-Huggins interaction parameters provided that signals are normalised by analyte molecules number. Signals shape was interpreted to the light of Langmuir-Henry-Clustering (LHC) model and found to be proportional to vapour content. (C) 2009 Elsevier B.V. All rights reserved.

}, keywords = {Atomic force microscopy, carbon nanotube, Chemo-electrical behaviour, Conductive polymer nanocomposite, Vapour Sensing, Volatile organic compounds}, issn = {0925-4005}, doi = {10.1016/j.snb.2009.05.006}, author = {Lu, Jianbo and Kumar, Bijandra and Castro, Mickael and Feller, Jean-Francois} } @article {47010, title = {Ovalbumin-mediated synthesis and simultaneous functionalization of graphene with increased protein stability}, journal = {Green Chemistry Letters and Reviews}, volume = {13}, year = {2020}, month = {JAN }, pages = {60-67}, type = {Article}, abstract = {

In this article, we have shown an easy, one-step, protein-directed approach for the synthesis of water-soluble and functional graphene using ovalbumin. The obtained ovalbumin functionalized graphene was characterized by UV-visible spectroscopy, X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy. Atomic force microscopy was used to check the attachment/functionalization of ovalbumin on grapheme sheets. It was shown that the functionalization of ovalbumin on grapheme sheets makes the protein more thermally stable compare to free ovalbumin, which has been shown by using sodium dodecyl sulfate polyacrylamide gel electrophoresis.

}, keywords = {Atomic force microscopy, graphene, graphene oxide, Ovalbumin, SDS-PAGE, thermal degradation}, issn = {1751-8253}, doi = {10.1080/17518253.2020.1725150}, author = {Ullah, Riaz and Khan, Shadab Ali and Aladresi, Aref Ali Mohammed and Alharbi, Sulaiman Ali and Chinnathambi, Arunachalam} }