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Effects of formulation and processing conditions on the physical properties of fat crystal networks

Asadipour Farsani, Benyamin (2014)
M.Res. thesis, University of Birmingham.

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Abstract

This thesis investigates the effects of formulation and processing conditions on the material properties of fat crystal networks. A scraped surface heat exchanger was used to control crystallisation and to produce fat crystal networks. Experiments were conducted to study the effects of formulation (solid fat composition) and processing conditions (scraped surface heat exchanger's mixing speed, coolant temperature, and throughput). Rheological studies were conducted to characterise the material properties of the fat systems. Viscosity measurements were carried out to study the effects of processing conditions on the material behaviour whilst oscillatory rheology was used to study the viscoelastic behaviour of the fat systems. Amplitude sweeps and oscillation tests (small scale rheological analysis) were conducted to study the viscous modulus (G”) and the elastic modulus (G') of the system which is an indicator of the macroscopic consistency of the network. Polarised light microscopy (PLM) was employed to observe the microstructure of the crystallised system. These images were used alongside image analysis software, ImageJ, to quantify the complexity of the microstructural level of the fat crystal networks by calculating their box-counting fractal dimensions (D\(_b\)). The thermal behaviour of fat systems was studied using differential scanning calorimetry (DSC).

Type of Work:M.Res. thesis.
Supervisor(s):Spyropoulos, Fotis and Norton, Ian
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemical Engineering
Subjects:TP Chemical technology
Institution:University of Birmingham
ID Code:4879
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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