2013
http://localhost:8080/xmlui/handle/123456789/503
2013 publications2024-03-28T12:34:23ZN‑Heterocyclic Carbene Catalyzed Reaction of Cinnamils Leading to the Formation of 2,3,8-Triaryl Vinyl Fulvenes: An Uncommon Transformation
http://localhost:8080/xmlui/handle/123456789/2609
N‑Heterocyclic Carbene Catalyzed Reaction of Cinnamils Leading to the Formation of 2,3,8-Triaryl Vinyl Fulvenes: An Uncommon Transformation
Sinu, C R; Eringathodi, Suresh; Vijay Nair
In the general context of organocatalysis,1 N-heterocyclic
carbenes (NHCs) occupy a prominent position. NHC
catalysis2 originated as early as 1958 with Breslow’s
demonstration3 that thiazolylidene was involved in the
thiazolium catalyzed benzoin condensation.4 However,
with the exception of its application in benzoin condensation
5 and the Stetter reaction,6 NHC catalysis received
little attention for a long time. A significant change in
this situation occurred in 2004, when Glorius7 and Bode8
2012-02-12T00:00:00ZEffect of precursor particle size distribution on the morphology and low wetting behavior of photocatalytic nanocoatings on glass surfaces
http://localhost:8080/xmlui/handle/123456789/2607
Effect of precursor particle size distribution on the morphology and low wetting behavior of photocatalytic nanocoatings on glass surfaces
Venu Sreekala, Smitha; Petit, Francois; Hareesh, Unnikrishnan Nair Saraswathy; Warrier, Krishna Gopakumar
The effect of particle size distribution of coating precursor on the morphology and low wetting character
of photocatalytic nanocoatings is investigated in the present work. TiO2–SiO2–Al2O3 nanocomposite
coatings containing Al2O3 particles of size in the range 20–200 nm have been prepared on glass
substrates by an aqueous sol–gel process. A composite sol of titanium dioxide containing 30 mol% silica
comprises the matrix sol to which alumina particles (1–10 mol%) having sizes in the range 20 to 200 nm
are introduced as stabilized dispersions and further coated on glass substrates by the dip-coating
method followed by annealing of the coatings at 400 C. A composite coating containing 2 mol%
boehmite derived alumina (TS-B-2) has been found to be more photoactive under visible light and was
low wetting in nature. The higher photocatalytic activity of the TS-B-2 nanocomposite is attributed to
the presence of phase pure anatase with crystallite size of 3.7 nm and high surface area of 315 m2 g 1,
while the low wetting character is attributed to the hierarchical morphology resulting in uniform
surface roughness. The present study significantly highlights the possibility of designing composite
precursors containing desired constituent particle sizes to produce nanocoatings differing in grain sizes,
surface roughness and morphology, resulting in increased self-cleaning and low wetting properties.
2013-08-07T00:00:00ZPreparation and Characterization of Selenium Incorporated Guar Gum Nanoparticle and Its Interaction with H9c2 Cells
http://localhost:8080/xmlui/handle/123456789/2587
Preparation and Characterization of Selenium Incorporated Guar Gum Nanoparticle and Its Interaction with H9c2 Cells
Rema Sreenivasan, Soumya; Vadavanath Prabhakaran, Vineetha; Premachandran Latha, Reshma; Kozhiparambil Gopalan, Raghu
This study deals with the preparation and characterization of selenium incorporated guar gum nanoparticle (SGG), and its
effect on H9c2 cardiomyoblast. Herein, nanoprecipitation techniques had been employed for the preparation of SGG
nanoparticle. The prepared nanoparticle had been subjected to various types of analytical techniques like transmission
electron microscopy (TEM), X-ray diffraction (XRD) and particle size analysis to confirm the characteristics of nanoparticle as
well as for selenium incorporation. Physical characterization of nanoparticle showed that the size of nanoparticles increase
upto ,69–173 nm upon selenium incorporation from ,41–132 nm. Then the prepared nanoparticles were evaluated for its
effect on H9c2 cells. In this regard, the effect of nanoparticle on various vital parameters of H9c2 cells was studied.
Parameters like cell viability, uptake of selenium incorporated guar gum nanoparticle by the cells, effect of SGG on DNA
integrity, apoptosis, reactive oxygen species generation, alteration in transmembrane potential of mitochondria and
cytoskeletal integrity had been investigated. Viability results showed that up to 25 nM of SGG was safe (10.31%) but beyond
that it induces cytotoxicity. Cellular uptake of selenium showed that cell permeability for SGG is significantly high compared
to normal selenium (7.2 nM of selenium for 25 nM SGG compared with 5.2 nM selenium for 25 nM sodium selenite). There
was no apoptosis with SGG and also it protects DNA from hydroxyl radical induced breakage. Likewise no adverse effect on
mitochondria and cytoskeleton was observed for 25 nM of SGG. Overall results reveal that SGG is highly suitable for
biomedical research application.
2013-09-30T00:00:00ZFluorine interaction controlled AIEE phenomenon in an expanded calixbenzophyrin and its vapoluminescent response: turn on emission with volatile ketones and esters
http://localhost:8080/xmlui/handle/123456789/2584
Fluorine interaction controlled AIEE phenomenon in an expanded calixbenzophyrin and its vapoluminescent response: turn on emission with volatile ketones and esters
Salini, P.S; Holaday, M. G. Derry; Reddy, M. L. P; Suresh, C. H.; Srinivasan, A
Fluorine interaction assisted AIEE characteristic in an expanded
calixbenzophyrin is presented by single-crystal X-ray-diffraction analysis
and molecular modelling approaches. Selective exposure to volatile
organic compounds such as ketones and esters results in the breaking
of fluorine interaction, leading to enhanced monomer emission
2013-01-23T00:00:00Z