Applied Rheology: Publications
You have network access to this resource: k-mai670 [1758]
Joachim Götz, Hartmut Balzer, Ruth Hinrichs
Characterisation of the Structure and Flow Behaviour of Model Chocolate Systems by Means of NMR and Rheology

Appl. Rheol. 15:2 (2005) 98-111

Abstract: In order to characterise the structure and flow behaviour of model chocolate systems Nuclear Magnetic Resonance (NMR) and rheometry were used to determine the T1 - and T2 - NMR relaxation times and their corresponding flow functions. T1 and T2 characterise the molecular mobility of fluids and correlate with both the zeroshear- rate and infinity viscosity of various chocolate model systems (determined with rotational rheometry and capillary rheometry). Based on this correlation, NMR provides the possibility to determine characteristic viscosities of chocolate masses by means of NMR-relaxation experiments. The viscosities of chocolate masses are important process parameters, as they are used for quality control of the production process. An online process viscosimetry via T2 relaxation would allow the installation of an efficient process control and, thus, a process automation. This NMR application with comparatively short measuring times is especially interesting for disperse systems where the use of conventional rheometric techniques may cause large errors. The only prerequisite for the measurement of the viscosities using NMR is a previous calibration. This was performed with the help of rotational and capillary rheometry. The NMR self-diffusion experiments are especially appropriate to characterise the influence of emulsifiers on the structure and the flow behaviour of chocolate masses. © 2005 Applied Rheology.

DOI 10.3933/ApplRheol-15-98

-- full text PDF available for subscribers --

-- open access PDF extract available for non-subscribers --


You have no password-free access to Applied Rheology Online. If you are a subscriber, enter login details below. For password-free access, we need your IP address. Sample manuscripts for free download can be found here

download to disk (some browsers prefer this option)
login name
password

Purchase this article for 20 € ?

Forgotten your login details? Send an email with subject "AR login" to login@appliedrheology.org


Appl Rheol 15 (2005) issues:

           


© Applied Rheology 2018