01581nas a2200193   4500008004100000022001400041245007100055210006700126260011000193300001400303490000600317520085700323100002301180700001901203700002001222700002201242700003001264856009301294       2013                        eng d  a2046-206900aDevelopment of a multifunctional catalyst for a ``relay'' reaction0 aDevelopment of a multifunctional catalyst for a relay reaction  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC  a2186-21910 v33 a<p>In the area of catalysis, nanoparticles and enzymes are two of the most important systems. By amalgamating the two, we present here proof of the concept that it is possible to prepare a multifunctional catalyst that can carry out a ``relay'' reaction. The catalyst consists of a surface bound enzyme on a metal(core)-silica(shell) nanoparticle architecture. Here the enzyme catalyzes the 1st reaction and the metal nanoparticles act as a catalyst for the 2nd reaction of the product from the 1st reaction. In particular, we have studied the catalytic activity of glucosidase grafted Au@mSiO(2) on 4-nitrophenyl-beta-glucopyranoside, where glucosidase will catalyse the 1st step to generate 4-nitrophenol, which acts as a substrate for the next reduction step which is catalysed by the Au nanoparticles present inside the mesoporous silica shell.</p>1 aGanai, Anal, Kumar1 aShinde, Pravin1 aDhar, Basab, B.1 aGupta, Sayam, Sen1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/development-multifunctional-catalyst-relay-reaction-001170nas a2200181   4500008004100000245007200041210006900113260000800182300001600190490000600206520055800212100001900770700002200789700001900811700002400830700003100854856010300885       2017                        eng d00aAmphi-functional mesoporous silica nanoparticles for dye separation0 aAmphifunctional mesoporous silica nanoparticles for dye separati  cJUL  a14914-149210 v53 aSynthesis of amphi-functional mesoporous silica nanoparticles (similar to 80 nm) by stepwise chemical modifications of outer and inner pore surfaces is reported. These materials display a clear "Janus" like character and are able to selectively and completely separate hydrophobic dyes form a mixture of dyes. Our results clearly suggest a clear partition of more hydrophobic dyes into the pores from a mixture of two dyes. In addition this material displays a remarkable recycling ability for 10 cycles with up to similar to 99% dye removal from water.1 aShinde, Pravin1 aGupta, Sayam, Sen1 aSingh, Baljeet1 aPolshettiwar, Vivek1 aPrasad, Bhagavatula, L. V.  uhttps://library.ncl.res.in/content/amphi-functional-mesoporous-silica-nanoparticles-dye-separation02808nas a2200277   4500008004100000022001400041245012400055210006900179260000900248300001100257490000800268520186200276653002402138653001802162653001802180653001602198653002602214100002102240700002402261700002202285700002302307700001902330700003002349700002002379856013102399       2020                        eng d  a0167-732200aInfluence of gold nanorods on the structure and photonic bandgap in a twist grain boundary phase with smectic C* blocks0 aInfluence of gold nanorods on the structure and photonic bandgap  cFEB   a1121170 v2993 a<p>We describe the first report of the influence of gold nanorods (GNR) on the induced twist grain boundary smectic C* (TGBC*) phase in a binary mixture of achiral bent-core and chiral linear liquid crystals. The GNR concentration-dependent phase diagram of these nanocomposites shows that the thermal range of this twist grain boundary phase having smectic C* blocks phase increases by 50% for an intermediate composition compared to that for the host binary mixture without nanorods. The inclusion of the nanorods is seen to have substantial effect on the structural and photonic bandgap features of the TGBC* phase. For example, the helical periodidty gets altered in all the three dimensions: while those within the block undergo a huge increase, the one which is orthogonal to the blocks, shrinks. The spacing of the square grid pattern arising normal to the TGB helix direction increases for the nanocomposites getting even doubled for a certain composition, a feature evidenced by optical microscopy as well as optical diffraction. Xray diffraction clearly brings out the feature that the presence of GNR alters the thermal character of the transition between the TGBC* and the cholesteric phase. Quantitative analysis of the data indicates that the system would remain in the vicinity of a possible tricritical point, a behavior having wider ramifications to understand the underlying critical phenomenon. Based on the experimental observations, and capturing the essence of the reported adaptive defect core targeting mechanism we propose a model wherein GNRs get confined in the grain boundary region. This feature offers a potential to have periodic and anisotropic plasmonic structure arising out of the synergetic interactions between the metal nanorod and the twisted grain boundary structure. (C) 2019 Elsevier B.V. All rights reserved.</p>
10a3D photonic bandgap10aGold nanorods10aInduced phase10aTGBC* phase10aTricritical phenomena1 aSahoo, Rajalaxmi1 aRao, D., S. Shankar1 aHiremath, Uma, S.1 aYelamaggad, V., C.1 aShinde, Pravin1 aPrasad, Bhagavatula L. V.1 aPrasad, Krishna  uhttps://library.ncl.res.in/content/influence-gold-nanorods-structure-and-photonic-bandgap-twist-grain-boundary-phase-smectic-c01825nas a2200205   4500008004100000022001400041245011600055210006900171260000800240300001200248490000700260520109500267653003001362653002201392653002101414653003001435100001901465700000501484856013001489       2021                        eng d  a0934-086600aAmphifunctional mesoporous silica nanoparticles with ``molecular gates'' for controlled drug uptake and release0 aAmphifunctional mesoporous silica nanoparticles with molecular g  cDEC  a21001850 v383 aIt is demonstrated that the uptake and release of hydrophobic drugs/dyes by mesoporous silica nanoparticles (MSN) is critically dependent on the functional groups present on their outer surfaces. For this, amphifunctional MSNs are synthesized, possessing hydrophobic pores and hydrophilic functional groups on the outer surface. Further, the outer surface is modified with a different chain length of molecules, e.g., propargyl alcohol, triethylene glycol, and PEG (2000) via azide-alkyne click chemistry. The effect of these different surface functional groups on uptake of drug/dye is demonstrated with Nile red, proflavine (free base form), and rhodamine 6G. The uptake of these molecules is found to be inversely proportional to the bulkiness of surface functionality. To counter this effect, an alternate method of loading is proposed and demonstrated. Finally, the effect of these different functional groups on the release of loaded drug proflavine is studied, which supports the hypothesis that bulkier outer surface groups also hinder the release of drugs loaded in the porous MSN.10adrug delivery and release10aMesoporous silica10amolecular gating10asurface functionalization1 aShinde, Pravin1 a  uhttps://library.ncl.res.in/content/amphifunctional-mesoporous-silica-nanoparticles-molecular-gates-controlled-drug-uptake-and