01704nas a2200157   4500008004100000022001400041245014800055210006900203260007100272300001600343490000700359520100500366100002101371700003001392856012401422       2014                        eng d  a0743-746300aTime and temperature effects on the digestive ripening of gold nanoparticles: is there a crossover from digestive ripening to ostwald ripening?0 aTime and temperature effects on the digestive ripening of gold n  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP  a10143-101500 v303 a<p>The effects of time and temperature on the gold nanoparticle sizes obtained by digestive ripening have been investigated. In digestive ripening, a polydisperse colloid, upon refluxing with a surface-active ligand in a solvent, gets converted to a nearly monodisperse one. In this study, a polydisperse gold nanoparticle system was heated in 4-tert-butyltoluene with hexadecanethiol at different temperatures, viz., 60, 90, 120, 150, and 180 degrees C for different time periods, and the trends in particle size variations were recorded. At lower temperatures such as 60 and 90 degrees C, after the initial narrowing of the size distribution, the particle sizes remain constant even though the refluxing step is continued for 24 h, substantiating the prevalence of the digestive ripening process. However, at elevated temperatures (120, 150, and 180 degrees C) particle sizes grow continuously, indicating a deviation from the digestive ripening behavior to an Ostwald ripening-type phenomenon.</p>1 aSahu, Puspanjali1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/time-and-temperature-effects-digestive-ripening-gold-nanoparticles-there-crossover-0