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Yadav, Santosh Kumar,Mahapatra, Sibdas Singha,Yoo, Hye Jin,Cho, Jae Whan Springer 2011 NANOSCALE RESEARCH LETTERS Vol.6 No.1
<P>A new hybrid material consisting of a polyhedral oligomeric silsesquioxane (POSS) and carbon nanotube (CNT) was synthesized by a simple and versatile approach entailing click coupling between azide moiety-functionalized POSS and alkyne-functionalized multi-walled CNTs. This approach provides a simple and convenient route to efficiently functionalize a wide variety of nanoscale nanostructure materials on the surface of CNTs.</P>
Facile and Ecofriendly Fluorination of Graphene Oxide
Yadav, Santosh Kumar,Lee, Jin Hong,Park, Hun,Hong, Soon Man,Han, Tae Hee,Koo, Chong Min Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
A one-pot, facile and ecofriendly approach to the fabrication of covalently fluorinated graphene using mild reaction conditions is reported. This straightforward and efficient strategy allows fluorine groups to be covalently and stably anchored onto graphene to produce single-layer functionalized graphene sheets from a graphene oxide precursor.
Facile and Ecofriendly Fluorination of Graphene Oxide
Santosh Kumar Yadav,Jin Hong Lee,Hun Park,홍순만,한태희,구종민 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
A one-pot, facile and ecofriendly approach to the fabrication of covalently fluorinated graphene using mild reaction conditions is reported. This straightforward and efficient strategy allows fluorine groups to be covalently and stably anchored onto graphene to produce single-layer functionalized graphene sheets from a graphene oxide precursor.
Yadav, Santosh Kumar,Mahapatra, Sibdas Singha,Cho, Jae-Whan,Park, Hoon-Cheol,Lee, Jae-Yeol 한국섬유공학회 2009 FIBERS AND POLYMERS Vol.10 No.6
Multi-walled carbon nanotubes (MWNTs) nanocomposites with the polymer matrix composed of blends of poly(vinylidene fluoride) (PVDF) and polyurethane (PU) were prepared via functionalization of 3,4,5-triflouroaniline (TFA) on MWNTs. The MWNTs/polymer nanocomposites showed a dominantly enhanced elongation due to incorporation of PU molecules in PVDF matrix and the improved MWNTs dispersion in the polymer matrix resulting from functionalization of MWNTs with TFA. The functionalization of TFA on MWNTs was confirmed by the measurements of Raman, FT-IR spectra, SEM, and TEM images. In addition, the dielectric constant of nanocomposites increased with an increase of TFA-functionalized MWNTs in PVDF/PU/MWNTs nanocomposites. The polymer blend nanocomposites incorporating MWNTs may be available as an alternative potential route for the actuator materials.
조재환,Yadav, Santosh Kumar,Mahapatra, Sibdas Singha,Cho, Jae Whan 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.6
A conducting polyaniline-$Fe_3O_4$ nanohybrid was synthesized via click coupling of iron oxide nanoparticles and 2-ethynylaniline. Covalent functionalization of the azide-functionalized iron oxide nanoparticles and the 2-ethynylaniline was confirmed with Fourier transform infrared spectroscopy and x-ray photoelectron spectroscopy, and the coating of polyaniline on iron oxide nanoparticles was confirmed with field-emission scanning electron microscopy. The nanohybrid incorporated into a poly(vinyl alcohol) (PVA) matrix by solution casting showed excellent compatibility with the PVA. Consequently, the mechanical properties and electrical conductivities of the resultant composite films were improved remarkably. This click coupling protocol offers the possibility of completely combining the extraordinary performance of nanohybrids with PVA properties.
Delayed Spontaneous Thrombosis of Neglected Direct Carotid-Cavernous Fistula: A Case Report
Tiwari Sarbesh,Garg Pawan Kumar,Khera Pushpinder Singh,K.B Santosh Babu,Yadav Taruna,Sureka Binit 대한신경중재치료의학회 2020 Neurointervention Vol.15 No.2
Direct carotid-cavernous fistula (CCF) refers to direct communication between the cavernous portion of the internal carotid artery (ICA) and the cavernous sinus due to rent in the ICA, most commonly secondary to trauma. These are generally high-flow fistula and rarely resolve spontaneously. We report a case of a young male who developed features of direct CCF after trauma, was denied any treatment for 4 years, and then presented with spontaneous thrombosis of the fistula and a residual large pseudoaneurysm of the cavernous segment of the right ICA, which was subsequently managed with parent vessel occlusion.
Jo, Wan-Kuen,Kumar, Santosh,Yadav, Poonam,Tonda, Surendar Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.445 No.-
<P><B>Abstract</B></P> <P>Herein, Ag<SUB>2</SUB>O/Ag<SUB>2</SUB>CO<SUB>3</SUB> nanocomposite with unique Janus morphology was synthesized by a facile ion-exchange followed by an in situ phase transformation method with precise control of its nucleation and growth processes. Contrary to conventional synthetic procedures of Janus architectures, the present Janus system was constructed without the need for surfactants or toxic chemicals. Most importantly, the visible-light-absorbing Janus Ag<SUB>2</SUB>O/Ag<SUB>2</SUB>CO<SUB>3</SUB> nanocomposite exhibits a remarkable performance toward the degradation of Rhodamine B and 4-chlorophenol, far superior to that observed for bare Ag<SUB>2</SUB>CO<SUB>3</SUB>. The obvious enhancement of the photocatalytic performance of this nanocomposite is mainly attributed to the intimate Ag<SUB>2</SUB>O/Ag<SUB>2</SUB>CO<SUB>3</SUB> interface created by its exceptional Janus architecture, which in turn allows for rapid charge transfer processes. Additionally, the Janus system exhibited a high photostability during recycling experiments with no significant change in the degradation activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A Janus system was constructed without the need for conventionally used surfactants. </LI> <LI> Facile ion-exchange followed by an in situ phase transformation method was used. </LI> <LI> Rapid charge transfer at Ag<SUB>2</SUB>O/Ag<SUB>2</SUB>CO<SUB>3</SUB> interface contributed to enhanced activity. </LI> <LI> Janus nanocomposite exhibited excellent photostability in recycling experiments. </LI> <LI> Janus system prepared using less harmful chemicals showed high photoactivity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Mahapatra, Sibdas Singha,Yadav, Santosh Kumar,Cho, Jae Whan American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.12
<P>Two types of hyperbranched poly(urea-urethane)-functionalized multi-walled carbon nanotubes (GHPU) have been synthesized in the presence of bis- and tris-hydroxy terminated carbon nanotubes (MWNT-OH). For comparison of the grafting efficiency on carbon nanotubes, pure hyper-branched poly(urea-urethane)s (HPUs) were also synthesized to prepare pristine carbon nanotubes-reinforced nanocomposites (HPNTs). Better MWNT dispersion in the polymer matrix was obtained for GHPU than for HPNT, and the effect was superior in the case of highly branched GHPU from tris-hydroxy-functionalized MWNTs, compared to GHPU from bis-hydroxy-functionalized MWNTs. TEM measurements for GHPUs clearly showed hyperbranched polymer-wrapped MWNT structures. Crystallization of hyperbranched polymers in GHPU was more developed than that of the HPNT nanocomposites, although MWNT-induced crystallization was observed for both the GHPU and HPNT samples. The hyperbranched polymer-grafting effect on MWNTs resulted in greater enhancement of the mechanical properties of GHPU at the same nanotube loading, compared to the case of HPNT nanocomposites. However, a too highly branched structure was found to lower the crystallization and mechanical properties of both the GHPUs and HPNTs.</P>