Structure and Mechanical Properties of Fat Crystal Networks

Abstract

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The Payne effect revisited

“…We had briefly mentioned above that this can be understood on the basis of 'fractal filler flocs' (cf. reference [5]; see also chapter 7 in reference [40]). But aside from the functional dependence of ∆μ′(0,T) on filler volume fraction, a reduction of filler always reduces the number of bonds with the polymer matrix.…”

On the fractional crystallization of palm olein: Solid solutions and eutectic solidification

“…Possibly the most crucial technical issue in industrial oil fractionation is maintaining a moderate viscosity of the crystal suspension while the crystallization degree further increases. It is well documented that rheological properties of fat crystal networks are determined by many factors, and not necessarily proportionally related to its crystallization degree (Braipson-Danthine & Deroanne, 2004;Marangoni & Narine, 2002). The only partial relevance of solid fat to the rheology of the system has also been demonstrated in a fat crystal suspension upon fractional crystallization of palm olein (Calliauw et al, 2007), in fact suggesting a specific fat crystal network build-up, or possibly a gel-phase formation restricting free-flow of the particles in the crystallizer.…”

Aging and Metastability of Monoglycerides in Hydrophobic Solutions

“…1 According to the literature, below the Krafft temperature, T K , the lamellar phase transforms into the alpha-crystalline phase which contained the hexagonal surfactant packing, characterized by a single X-ray short spacing at 4.18Å. 17,18 Results of our recent work 5 indicate that the same structural feature is seen in the inverse-lamellar phase of MG in the oil matrix, where the characteristic 4.17Åspacing arises from the hexagonal ordering of glycerol heads in the tightly compressed mid-bilayer planes (while the aliphatic tails remained disordered, although laterally densely packed). Since the characteristically concentration-independent Krafft point T K involves crystallization on demixing, we are concerned about the structural interpretation of the alpha-phase in aqueous systems -however, this is not the subject of the present article, which deals with purely non-aqueous systems.…”