Structural Transition of Non-ionic Poly(acrylamide) Gel

Mukai, Satoru; Miki, Hirohisa; Garamus, V. M.; Willmeit, Regine; Tokita, Masayuki

doi:10.1007/978-3-642-00865-8_13

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…The particles thus formed in the opaque gels are, therefore, regarded as a hard sphere. In addition to this, the small angle neutron scattering from the opaque gel strongly suggest that gel is a fractal with the fractal dimension of Df≃2.7 [39,40,41,42]. The results suggest that the colloidal particles of AAm and BIS are formed and they aggregate by the process of the diffusion limited aggregation or the cluster-cluster aggregation process.…”

Section: Friction Of Gelmentioning

confidence: 97%

Transport Phenomena in Gel

Tokita

2016

Gels

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Gel becomes an important class of soft materials since it can be seen in a wide variety of the chemical and the biological systems. The unique properties of gel arise from the structure, namely, the three-dimensional polymer network that is swollen by a huge amount of solvent. Despite the small volume fraction of the polymer network, which is usually only a few percent or less, gel shows the typical properties that belong to solids such as the elasticity. Gel is, therefore, regarded as a dilute solid because its elasticity is much smaller than that of typical solids. Because of the diluted structure, small molecules can pass along the open space of the polymer network. In addition to the viscous resistance of gel fluid, however, the substance experiences resistance due to the polymer network of gel during the transport process. It is, therefore, of importance to study the diffusion of the small molecules in gel as well as the flow of gel fluid itself through the polymer network of gel. It may be natural to assume that the effects of the resistance due to the polymer network of gel depends strongly on the network structure. Therefore, detailed study on the transport processes in and through gel may open a new insight into the relationship between the structure and the transport properties of gel. The two typical transport processes in and through gel, that is, the diffusion of small molecules due to the thermal fluctuations and the flow of gel fluid that is caused by the mechanical pressure gradient will be reviewed.

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Section: Friction Of Gelmentioning

confidence: 97%

Transport Phenomena in Gel

Tokita

2016

Gels

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“…The results seem to suggest that the structure of the colloidal gel is formed through the DLA process. See [11]. 18.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

“…In this review, therefore, we present the structural study of an opaque gel by using the confocal laser scanning microscope (CLSM) technique. Then, the frictional property of the opaque gel is discussed in terms of the resolved real-space structure of the gel [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Structure and Frictional Properties of Colloid Gel

Tokita

2014

Polymers

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Abstract:Polymer gels are known to be opaque when the preparation conditions, such as the reaction temperature and the composition, are changed. The increase of the opaqueness of the gel suggests strongly the change of network structure. Here, we are going to review the recent studies on the structure and the frictional study of the opaque poly(acrylamide) gel. The results indicate that the opaque poly(acrylamide) gel consists of the fractal aggregate of the colloidal particles of sub-micrometer in size. The density of the colloid particle is calculated from the structural parameters and is found to be of the order of about 1 g/cm 3 . The results indicate that the main chain component and the cross-linker is densely cross-linked into the particle. The frictional property of poly(acrylamide) gel is analyzed in terms of the structural parameters of the gel. It is found that the frictional property of the opaque gel is well explained in terms of the structural parameters of the opaque gel.Keywords: poly(acrylamide) gel; confocal laser scanning microscope (CLSM); friction coefficient between the solvent and the polymer network of a gel; colloid gel; diffusion limited aggregation (DLA); cluster-cluster aggregation (CCA)

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