Gel Dynamics

Doi, Masao

doi:10.1143/jpsj.78.052001

Cited by 303 publications

(338 citation statements)

References 40 publications

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“…Several models have been proposed which aim to couple the diffusion of absorbed solvent throughout the film with the elastic [40,41,42] or viscoelastic [43,44,45,46] response of the polymer network. Simplifications of these models that neglect the detailed mechanics of the polymer matrix have been proposed in the context of drug delivery [47,48,49].…”

Section: Introductionmentioning

confidence: 99%

A minimal model for solvent evaporation and absorption in thin films

Hennessy

Ferretti

Cabral

et al. 2017

Journal of Colloid and Interface Science

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We present a minimal model of solvent evaporation and absorption in thin films consisting of a volatile solvent and nonvolatile solutes. An asymptotic analysis yields expressions that facilitate the extraction of physically significant model parameters from experimental data, namely the mass transfer coefficient and composition-dependent diffusivity. The model can be used to predict the dynamics of drying and film formation, as well as sorption/desorption, over a wide range of experimental conditions. A state diagram is used to understand the experimental conditions that lead to the formation of a solute-rich layer, or "skin", at the evaporating surface during drying. In the case of solvent absorption, the model captures the existence of a saturation front that propagates from the film surface towards the substrate. The theoretical results are found to be in excellent agreement with data produced from dynamic vapour sorption experiments of ternary mixtures comprising an aluminum salt, glycerol, and water. Moreover, the model should be generally applicable to a variety of practical contexts, from paints and coatings, to personal care, packaging, and electronics.

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Section: Introductionmentioning

confidence: 99%

A minimal model for solvent evaporation and absorption in thin films

Hennessy

Ferretti

Cabral

et al. 2017

Journal of Colloid and Interface Science

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“…Considering pure water as solvent and knowing that for equilibrium state the chemical potential is constant and equal to zero, the stress tensor can be obtained as: (8) in which the solvent concentration c , can be eliminated from W by using swelling constraint [28]. Now, if the free energy function is defined properly, the stress field for any boundary value problem will be calculated.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Smart hydrogels composed of covalently cross-linked polymeric network which can response to environmental stimuli such as temperature [1][2][3], pH [4][5][6], mechanical load [7,8], ionic and salt concentration [9,10], light [11][12][13] and electric field [14,15] and can imbibe large amount of water and experience a large deformation. These materials can be used as sensor and actuator simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Study of swelling behavior of temperature sensitive hydrogels considering inextensibility of network

Mazaheri

2018

Scientia Iranica

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In this work, the equilibrium swelling of temperature sensitive hydrogel networks is studied with an emphasis on the chain locking of the network. Using Gent model for elastic part of free energy and modifying the mixing part of the free energy, a continuous model is developed which consider inextensibility of the network chains and has a good agreement with the experimental data particularly for smaller values of crosslinking density of the network and larger values of the swelling ratio. After validating the modified model, it is employed for the studying the inhomogeneous swelling of a spherical shell on a hard core both analytically and numerically.The analytical solution is used for validating the numerical method. Finally, the inhomogeneous swelling of a bilayer beam with an active temperature sensitive hydrogel is investigated and the results are presented. The obtained results show the importance level of considering the chain locking in swelling of the network in the applied problems.

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“…The importance of this phenomenon is explained by the fact that coil-globule transition plays a crucial role in recent technological advances from targeted delivery of drug molecules to their encapsulation in a polymer coil. [1][2][3] On the other hand, understanding the conformational transitions of the single polymer chain in the solution is the basis of understanding the thermodynamic and structural properties of the so-called soft active materials, including dielectric elastomers, 4 elastomeric gels, 5 polyelectrolytes, [6][7][8][9][10][11][12][13][14][15][16][17] copolymers, 18,19 pH-sensitive hydrogels, 20 and temperaturesensitive hydrogels. 21 Today, the great efforts taken to develop a coil-globule transition theory have made a great contribution to understand this phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Communication: Polarizable polymer chain under external electric field in a dilute polymer solution

Budkov

Kolesnikov

Киселев

2015

The Journal of Chemical Physics

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We study the conformational behavior of polarizable polymer chain under an external homogeneous electric field within the Flory type self-consistent field theory. We consider the influence of electric field on the polymer coil as well as on the polymer globule. We show that when the polymer chain conformation is a coil, application of external electric field leads to its additional swelling. However, when the polymer conformation is a globule, a sufficiently strong field can induce a globule-coil transition. We show that such "field-induced" globule-coil transition at the sufficiently small monomer polarizabilities goes quite smoothly. On the contrary, when the monomer polarizability exceeds a certain threshold value, the globule-coil transition occurs as a dramatic expansion in the regime of first-order phase transition. The developed theoretical model can be applied to predicting polymer globule density change under external electric field in order to provide more efficient processes of polymer functionalization, such as sorption, dyeing, and chemical modification C 2015 AIP Publishing LLC. [http://dx

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Gel Dynamics

Cited by 303 publications

References 40 publications

A minimal model for solvent evaporation and absorption in thin films

A minimal model for solvent evaporation and absorption in thin films

Study of swelling behavior of temperature sensitive hydrogels considering inextensibility of network

Communication: Polarizable polymer chain under external electric field in a dilute polymer solution

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