01598nas a2200253 4500008004100000022001400041245014700055210006900202260007100271300001600342490000600358520064800364653002001012653001401032653002501046653001901071100002201090700002001112700002701132700002101159700002101180700001801201856012501219 2013 eng d a1944-824400aSelective imaging of quorum sensing receptors in bacteria using fluorescent Au nanocluster probes surface functionalized with signal molecules0 aSelective imaging of quorum sensing receptors in bacteria using  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcDEC a13076-130810 v53 a

Fluorescent ultrasmall gold clusters decorated with bacterial quorum sensing signal molecules, acyl homoserine lactone, are synthesized. These fluorescent probes are found to have emission in the near-infrared spectral region advantageous for bioimaging. Imaging studies using different. strains of bacteria with and without acyl homoserine lactone receptors with the aid of confocal microscopy have shown that the probe interacts preferentially with cells possessing these receptors. This indicates that, with appropriate surface functionalization, the Au clusters can be used for receptor specific detection with enhanced selectivity.

10aAu nanoclusters10aBiosensor10afluorescence imaging10aquorum sensing1 aMukherji, Ruchira1 aSamanta, Anupam1 aIllathvalappil, Rajith1 aChowdhury, Somak1 aPrabhune, Asmita1 aDevi, Nandini uhttp://library.ncl.res.in/content/selective-imaging-quorum-sensing-receptors-bacteria-using-fluorescent-au-nanocluster-002122nas a2200193 4500008004100000022001400041245011800055210006900173260011000242300001400352490000600366520130200372100002501674700002001699700002701719700002801746700002401774856013001798 2015 eng d a2050-748800aSurface-modified single wall carbon nanohorn as an effective electrocatalyst for platinum-free fuel cell cathodes0 aSurfacemodified single wall carbon nanohorn as an effective elec aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN a4361-43670 v33 a

Platinum (Pt) and its alloys are routinely used in the cathodes of polymer electrolyte membrane fuel cells (PEMFCs) due to their high electrocatalytic activity in oxygen reduction reactions (ORRs). A variety of alternative materials have been examined as alternatives to Pt, but most of these had low activity and their performance deteriorated even further in use. In the present study an alternate electrocatalyst has been examined, obtained by a simple surface modification of single-walled carbon nanohorns by simultaneous doping with Fe and N at 900 degrees C (FeNCNH-900). This had an ORR activity superior to that of 40 wt% Pt on carbon (Pt/C). Compared to Pt/C, FeNCNH-900 gave a 30 mV improvement in onset potential and a 20 mV gain in half-wave potential in an ORR. Its high activity is the result of the simultaneous modulation achieved by the high surface area and the microporosity of carbon nanohorns, together with the establishment of the desired nitrogen-iron coordinated pyrrolic active centres. The catalyst showed excellent electrochemical stability and, most notably, its ORR activity was still increasing after 1000 cycles. Single-cell fuel cell performance using FeNCNH-900 as cathode catalyst showed a maximum power density of 35 mW cm(-2) under alkaline conditions.

1 aUnni, SreeKuttan, M.1 aRamadas, Sarath1 aIllathvalappil, Rajith1 aBhange, Siddheshwar, N.1 aKurungot, Sreekumar uhttp://library.ncl.res.in/content/surface-modified-single-wall-carbon-nanohorn-effective-electrocatalyst-platinum-free-fuel-002252nas a2200253 4500008004100000022001400041245011800055210006900173260000900242300001200251490000800263520137900271653002701650653002301677653001401700653002401714653002401738100001901762700002101781700002701802700002401829700001401853856013101867 2019 eng d a0013-468600aStudies on nano composites of SPEEK/ethylene glycol/cellulose nanocrystals as promising proton exchange membranes0 aStudies on nano composites of SPEEKethylene glycolcellulose nano cJAN  a260-2720 v2933 a

The present work deals with fabrication and characterisations of nano-composite membranes composed of sulfonated poly (ether ether ketone) (SPEEK) cross-linked and reinforced with ethylene glycol (EG) and cellulose nanocrystals (CNCs) respectively. The thin films of cross-linked composite membranes were prepared by solvent casting method and further analysed for physicochemical and electrochemical properties to execute their applicability as promising proton exchange membrane (PEM) in fuel cells. The process of cross-linking helps to improve the strength and dimensional stability of bare SPEEK membranes without compromising with conductivity. However, presence of CNCs further improves the strength and provides an effective pathway for the conduction of protons in membranes by interacting through their surface hydroxyl and sulfonic acid groups with ionic moieties of polymer matrix. All prepared composite membranes showed good oxidative and thermal stability along with good proton conductivity. The cross-linked SPEEK membranes with 4 wt% loading of CNCs possess an appreciable proton conductivity of 0.186 S/cm at 95 degrees C and 95% RH which is comparable to Nafion 117. From the view point of above studies, the prepared nano-composite can be described as promising proton exchange membrane for fuel cells. (c) 2018 Elsevier Ltd. All rights reserved.

10aCellulose nanocrystals10aCross-linked SPEEK10afuel cell10aoxidative stability10aproton conductivity1 aBano, Saleheen1 aNegi, Yuvraj, S.1 aIllathvalappil, Rajith1 aKurungot, Sreekumar1 aRamya, K. uhttp://library.ncl.res.in/content/studies-nano-composites-speekethylene-glycolcellulose-nanocrystals-promising-proton-exchange01377nas a2200217 4500008004100000022001400041245012800055210006900183260001100252300001400263490000700277520059000284100001800874700002700892700001900919700001800938700002400956700002400980700002501004856013001029 2022 eng d a1523-706000aSynthesis of a highly electron-deficient, water-stable, large ionic box: multielectron accumulation and proton conductivity0 aSynthesis of a highly electrondeficient waterstable large ionic  cAPR 19 a3038-30420 v243 a

pi-acidic boxes exhibiting electron reservoir and proton conduction are unprecedented because of their instability in water. We present the synthesis of one of the strongest electron-deficient ionic boxes showing e(-) uptake as well as proton conductivity. Two large anions fit in the box to form anion-pi interactions and form infinite anion-solvent wires. The box with NO3-center dot center dot center dot water wires confers high proton conductivity and presents the first example that manifests redox and ionic functionality in an organic electron-deficient macrocycle.

1 aShukla, Jyoti1 aIllathvalappil, Rajith1 aKumar, Sharvan1 aChorol, Sonam1 aPandikassala, Ajmal1 aKurungot, Sreekumar1 aMukhopadhyay, Pritam uhttp://library.ncl.res.in/content/synthesis-highly-electron-deficient-water-stable-large-ionic-box-multielectron-accumulation