01651nas a2200217 4500008004100000022001400041245011700055210006900172260007100241300001400312490000700326520083500333100002001168700002001188700002101208700002301229700001501252700001901267700001901286856012801305 2005 eng d a0897-475600aPorous gold nanospheres by controlled transmetalation reaction: a novel material for application in cell imaging0 aPorous gold nanospheres by controlled transmetalation reaction a a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcOCT a5000-50050 v173 a

Hollow shell nanostructures have numerous potential applications due to their interesting optical and electronic properties, which can be tuned by varying their shape, size, and shell thickness. In this paper we describe a simple galvanic replacement reaction (transmetalation reaction) involving sacrificial silver nanoparticles and Au(III) ions using a dialysis membrane. The dialysis membrane acts as a partial barrier that provides excellent control over the kinetics of reaction. This process results in the formation of porous gold nanospheres that improve the fluorescence in cell staining by offering an enhanced surface area for binding of the fluorescent dye, propidium iodide (PI). Such porous nanostructures could be ideal candidates for applications such as catalysis, enzyme immobilization, and drug delivery.

1 aShukla, Sourabh1 aPriscilla, Anie1 aBanerjee, Meenal1 aBhonde, Ramesh, R.1 aGhatak, J.1 aSatyam, P., V.1 aSastry, Murali uhttps://library.ncl.res.in/content/porous-gold-nanospheres-controlled-transmetalation-reaction-novel-material-application-001837nas a2200265 4500008004100000022001400041245010700055210006900162260009500231300001400326490000600340520085700346653002501203653003001228653001301258653002501271653002601296653002501322653002101347653002101368100002001389700001901409700001901428856012401447 2009 eng d a1533-488000aPorous anisotropic metal nanostructures through controlled transmetallation across a dialysis membrane0 aPorous anisotropic metal nanostructures through controlled trans a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScNOV a6401-64080 v93 a

Nanostructured metals with hollow interiors are of technological importance due to their unique optoelectronic properties and enhanced surface area. We describe herein, a novel method for the synthesis of anisotropic gold and palladium nanoparticles through a simple galvanic replacement reaction across a semi-permeable dialysis membrane. The control over the reaction kinetics achieved by the presence of membrane enables one to tune the bimetal composition, particle porosity and morphology. Rapid outward diffusion of silver ions generated from the sacrificial silver nanoparticles even at room temperatures prevents the precipitation of high quantities of silver chloride, thereby circumventing the need for product purification. The porous anisotropic nanostructures have potential applications in catalysis, cell imaging and therapeutics.

10aAg/Pd Nanostructures10aAnisotropic Nanoparticles10aDialysis10aGalvanic Replacement10aPorous nanostructures10aSilver Nanotriangles10aSilver Nanowires10aTransmetallation1 aShukla, Sourabh1 aPasricha, Renu1 aSastry, Murali uhttps://library.ncl.res.in/content/porous-anisotropic-metal-nanostructures-through-controlled-transmetallation-across-001712nas a2200157 4500008004100000022001400041245013400055210006900189260011000258300001200368490000600380520100300386100002001389700001901409856012601428 2009 eng d a2040-336400aProbing differential Ag+-nucleobase interactions with isothermal titration calorimetry (ITC): towards patterned DNA metallization0 aProbing differential Agnucleobase interactions with isothermal t aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT a122-1270 v13 a

DNA has been Successfully used as a scaffold for the fabrication of metallic nanowires, primarily based oil the electrostatic complexation and reduction of the metal cations on the negatively charged sugar-phosphate backbone. Here. we probe the differential binding affinities of nucleobases for silver ions using sensitive isothermal titration calorimetry (ITC) measurements of the reaction enthalpies, which go in order: C > G > A >= T. Using the disparity between the interaction of cytosine (strong binding) and thymine (weak binding) with silver ions, we have successfully generated silver nanoparticle doublets and triplets on custom-made oligonucleotides, C-30-T-40-C-30 and C-20-T-20-C-20-T-20-C-20, respectively. Thus, it new and simple method of generating metallized DNA wires is presented, based entirely on the nucleotide sequence of DNA. The concept could be extended to other cations and complex DNA sequences in order to achieve intricately patterned DNA constructs.

1 aShukla, Sourabh1 aSastry, Murali uhttps://library.ncl.res.in/content/probing-differential-ag-nucleobase-interactions-isothermal-titration-calorimetry-itc-0