Digestive ripening

Prasad, B. L. V. Stoeva, S. 1. Sorensen, C. M. and Klabimde, K J. (2002). Digestive Ripening of Thiolated Gold Nanoparticles The Effect of Alkyl Chain Length. Langmuir, 28, 7515-7520. 

Digestive Ripening, or Nanomachining, to Achieve Nanocrystal Size Control... 

Figure 5. Synthetic steps for preparation of monodispersed Au nanoparticles by the inverse micelle method and digestive ripening.

Figure 6. TEM micrographs representing the transformations of (a) polydispersed nanoparticles upon (b) alkanethiol addition at room temperature and (c) after digestive ripening (inverse micelle system). (Reprinted with permission from Ref [49], 2002 American Chemical Society.)...

With the groundwork of digestive ripening laid out by the investigations of gold nanoparticles, the need arose to... 

Figure 9. TEM micrographs of nanocrystal superlattices of Au nanoparticles prepared by the inverse micelle method and digestive ripening, (a) and (b) low-magnification images (c (f) regularly-shaped nanocrystal superlattices (g) magnified image of a superlattice edge. Note the perfect arrangement of the Au nanoparticles. (Reprinted with permission from Ref. [30], 2003, American Chemical Society.)...

Figure 11. TEM of SMAD prepared Ag nanoparticles before digestive ripening.

A testament to the lower reactivity of silver compared to gold in digestive ripening is the longer reaction times. For the same concentration of material, it takes several hours to completely ripen the colloid. This may have a lot to do with the greater size of the initial particles provided by the SMAD, compared with gold. In order to... 

Figure 12. TEM micrograph of the Ag colloid in Figure 11 after digestive ripening.

Digestive Ripening as a Route to Create Alloy Nanoparticles Silver-Gold and Copper-Gold [59]... 

We postulate that if a naturally stable alloy exists for a particle, it could be achieved from its precursors under the right conditions from digestive ripening [59]. 

Digestive Ripening of Binuclear Systems, Such As CdSe... 

C12H25LC12X), silanes (Ci8H37SiH3), and simple alkanes (CioH22). The experimental procedure for the digestive ripening process with different ligands is detailed below. 

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