By Matthias Kind, Wolfgang Peukert, Heinz Rehage, Heike P. Schuchmann
This booklet bargains with colloidal structures in technical techniques and the effect of colloidal structures via technical strategies. It explores how new size functions can provide the potential of a dynamic improvement of clinical and engineering, and examines the foundation of colloidal structures and its use for brand new products.
The destiny demanding situations to colloidal technique engineering are the advance of applicable apparatus and tactics for the creation and obtainment of multi-phase constructions and lively interactions in market-relevant amounts. The ebook explores the appropriate procedures and for managed creation and the way they are often used throughout all scales.
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Additional info for Colloid Process Engineering
Due to the low signal-to-noise ratio of the alkyl chain signal of the gel sample the peak resulting from residual protons in water and a background signal from the Teflon coil support appear enlarged. 6, the chain melting in the gel sample can be clearly detected with the rheoprobe. The very first experiments under shear have not yet shown a change of the NMR spectrum and further investigations at variable temperatures and compositions should be performed. 5 NMR Diffusometry Pulsed field gradient NMR is an established tool for the investigation of self-diffusion, which is very sensitive to the structure of surfactant systems [3, 13, 31, 40].
4 Rheo-NMR Spectroscopy In the dilute region of bilayer-forming systems vesicles are very common, in particular when shear is applied during mixing. Vesicles also exist in the SDS/CA/ water system, cf. 6. In more concentrated systems containing 35–60 wt% surfactant 2H NMR spectroscopy under shear, so-called rheo-NMR [8, 20], has been used to detect vesicles and their formation or destruction in situ [29, 30, 36]. At high water content, as mentioned before, there is neither a resolved splitting (for layered structures) nor a noticeable line-broadening (in the case of vesicles) and 2H rheo-NMR spectroscopy using D2O as probe molecule fails.
On the other hand, 1H NMR was found to be very sensitive to the structures in the dilute SDS/CA/water system and should provide information on the effect of shear in such dilute gel-forming systems. In particular, it should be possible to follow the processes of chain melting and freezing, which depend on the composition of the phases present and therefore on the mixing protocol. As a first step towards such investigations a prototype 1H rheo-probe was built as part of this project . 6 some spectra obtained with the 1H rheo-probe are shown .
Colloid Process Engineering by Matthias Kind, Wolfgang Peukert, Heinz Rehage, Heike P. Schuchmann