TY - JOUR
T1 - Towards a phenomenological definition of the term 'gel'
AU - Almdal, K.
AU - Dyre, J.
AU - Hvidt, S.
AU - Kramer, O.
PY - 1993
Y1 - 1993
N2 - The term ‘gel’ is used so indiscriminately that it has become ambiguous. Existing definitions are reviewed, examples of unfortunate uses of the term are discussed, and important phenomenological characteristics of gels are identified. We propose that the term ‘gel’ should be limited to systems which fulfil the following phenomenological characteristics: (a) they consist of two or more components one of which is a liquid, present in substantial quantity and (b) they are soft, solid, or solid-like materials. We further propose a definition of the solid-like characteristics of gels in terms of the dynamic mechanical properties, viz. a storage modulus, G′(ω), which exhibits a pronounced plateau extending to times at least of the order of seconds and a loss modulus, G″(ω), which is considerably smaller thatn the storage modulus in the plateau region.
AB - The term ‘gel’ is used so indiscriminately that it has become ambiguous. Existing definitions are reviewed, examples of unfortunate uses of the term are discussed, and important phenomenological characteristics of gels are identified. We propose that the term ‘gel’ should be limited to systems which fulfil the following phenomenological characteristics: (a) they consist of two or more components one of which is a liquid, present in substantial quantity and (b) they are soft, solid, or solid-like materials. We further propose a definition of the solid-like characteristics of gels in terms of the dynamic mechanical properties, viz. a storage modulus, G′(ω), which exhibits a pronounced plateau extending to times at least of the order of seconds and a loss modulus, G″(ω), which is considerably smaller thatn the storage modulus in the plateau region.
KW - Materialer med særlige fysiske og kemiske egenskaber
U2 - 10.1016/0966-7822(93)90020-I
DO - 10.1016/0966-7822(93)90020-I
M3 - Journal article
SN - 0966-7822
VL - 1
SP - 5
EP - 17
JO - Polymer Gels and Networks
JF - Polymer Gels and Networks
IS - 1
ER -