Picture of automobile manufacturing plant

Driving innovations in manufacturing: Open Access research from DMEM

Strathprints makes available Open Access scholarly outputs by Strathclyde's Department of Design, Manufacture & Engineering Management (DMEM).

Centred on the vision of 'Delivering Total Engineering', DMEM is a centre for excellence in the processes, systems and technologies needed to support and enable engineering from concept to remanufacture. From user-centred design to sustainable design, from manufacturing operations to remanufacturing, from advanced materials research to systems engineering.

Explore Open Access research by DMEM...

Formation of valine microcrystals through rapid antisolvent precipitation

Variny, Miroslav and Alvarez de Miguel, Sandra and Moore, Barry D. and Sefcik, Jan (2008) Formation of valine microcrystals through rapid antisolvent precipitation. Journal of Dispersion Science and Technology, 29 (4). pp. 617-620. ISSN 0193-2691

This is the latest version of this item.

[img]
Preview
Text (strathprints015031)
strathprints015031.pdf - Accepted Author Manuscript

Download (88kB) | Preview

Abstract

In this work we have experimentally studied concentration effects on antisolvent precipitation of valine (an amino acid) from aqueous isopropanol solutions. Our experiments showed that the valine precipitation is very sensitive to both the supersaturation and to the water content in the final solution. Results from spectrophotometric measurements and supersaturation analysis showed that the crystal formation kinetics are strongly dependent on both mixing and concentration profiles in the early stages of the process, even though no visible change in the systems occurs immediately upon mixing with the antisolvent or subsequent dilution. Results from small-angle static light scattering measurements showed that the first visible crystals are of micron size and they grow only little over time, while their number increases gradually. Taken together, these experiments point to intermediate phase separation of (possible amorphous) precursors, being either very small nanoparticles or droplets with their refractive index closely matching that of the continuous phase, which subsequently assemble into micron size valine crystals.

Available Versions of this Item

  • Formation of valine microcrystals through rapid antisolvent precipitation. (deposited 19 Feb 2010 14:24) [Currently Displayed]