期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 47, 期 21, 页码 2982-2990出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2010.07.001
关键词
Adipose tissue; Foams; Micromechanics; Rheology
类别
资金
- EPSRC
- Novo Nordisk A/S, Denmark
- Cambridge University Multi-imaging centre
The microstructure of porcine adipose tissue is examined, and a micromechanical model is proposed for the dependence of overall effective modulus upon the moduli of the constituent microstructural units. Scanning electron microscopy and confocal microscopy reveal that the woven collagen network surrounding each adipocyte resembles a closed cell foam of relative density (rho) over bar (m) = 0.1, while the collagen interlobular septa behave as an open cell foam of relative density (rho) over bar (s) = 3 x 10(-4). The measured viscosity of the lipid within the adipocytes is eta = 36.8 mPa s at 37 degrees C: this is sufficiently small for the lipid to be idealised as an incompressible inviscid fluid. It is argued that the modulus of adipose tissue is dictated by the collagen network that surrounds the adipocytes. The volume fraction of the interlobular septa is sufficiently low that it provides a negligible contribution to the macroscopic modulus. (C) 2010 Elsevier Ltd. All rights reserved.
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