01458nas a2200157   4500008004100000022001400041245012600055210006900181260007100250300001400321490000700335520077200342100002401114700003001138856013201168       2010                        eng d  a0897-475600aMelting characteristics of superlattices of alkanethiol-capped gold nanoparticles: the ``excluded'' story of excess thiol0 aMelting characteristics of superlattices of alkanethiolcapped go  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR  a1680-16850 v223 a<p>Melting characteristics of gold nanoparticle superlattices obtained from nanoparticles capped by alkanethiols of different chain lengths (octane, dodecane and hexadecane) have been investigated. The alkanethrol capped nanoparticles were synthesized by the well-established digestive ripening method It is observed that as the chain length Of the thiol increases, the propensity to form superlattices decreases and the melting of the superlattice is observed at lower temperature However, the Formation of the 3D superlattice is critically dependent on the presence of ``excess'' thiol as determined from thermogravimetric and transmission electron microscope analysis. In the absence of ``excess'' thiol, only 2D hexagonally close-packed arrangements were seen</p>1 aSidhaye, Deepti, S.1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/melting-characteristics-superlattices-alkanethiol-capped-gold-nanoparticles-excluded-story-001737nas a2200157   4500008004100000022001400041245009500055210006900150260011000219300001200329490000700341520105000348100002401398700003001422856012701452       2011                        eng d  a1144-054600aMany manifestations of digestive ripening: monodispersity, superlattices and nanomachining0 aMany manifestations of digestive ripening monodispersity superla  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN  a755-7630 v353 a<p>Digestive ripening has now been established as a very convenient route to obtain monodisperse nanoparticles from polydisperse ones by refluxing the latter in the presence of an excess ligand. Many ligands including long chain thiols, amines, or phosphines have been shown to be effective digestive ripening agents. It is hypothesized that the surface active groups of such digestive ripening agents bind and remove reactive surface atoms/clusters from big nanoparticles and redeposit them on smaller nanoparticles. In this way, large particles become smaller, while small particles become larger, and eventually, an equilibrium size is obtained that is specific to each of the digestive ripening agents used. Herein, the digestive ripening procedure is reviewed, discussed and its utility spanning the preparation of monodispersed metal nanoparticles, alloy nanoparticles, superlattice structures and the most interesting nano-machining (wherein the monodisperse particles can be reverted back to the polydisperse system) is demonstrated.</p>1 aSidhaye, Deepti, S.1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/many-manifestations-digestive-ripening-monodispersity-superlattices-and-nanomachining-0