Actuation performances of anisotropic gels

  title={Actuation performances of anisotropic gels},
  author={Paola Nardinocchi and Luciano Teresi},
  journal={Journal of Applied Physics},
We investigated the actuation performances of anisotropic gels driven by mechanical and chemical stimuli, in terms of both deformation processes and stroke–curves, and distinguished between the fast response of gels before diffusion starts and the asymptotic response attained at the steady state. We also showed as the range of forces that an anisotropic hydrogel can exert when constrained is especially wide; indeed, changing fiber orientation allows us to induce shear as well as transversely… 

Swelling-induced wrinkling in layered gel beams

  • P. NardinocchiE. Puntel
  • Engineering
    Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2017
It is observed that surface instability precedes and envelopes wrinkling modes of finite wavelength and the effect of changes in stiffness and of the Flory–Huggins parameters χ on the size of the wrinkling domain is discussed.

Transient instabilities in the swelling dynamics of a hydrogel sphere

We investigate the swelling dynamics driven by solvent absorption in a hydrogel sphere immersed in a solvent bath, through a computational model and a numerical study. We extensively describe the

Swelling and shrinking in prestressed polymer gels: an incremental stress–diffusion analysis

A nonlinear stress–diffusion model is employed to investigate the stress and the deformation state arising in hydrated constrained polymer gels when subject to a varying chemical potential.

Swelling and growth: a constitutive framework for active solids

We aim at coupling the theory of swelling, describing the effects of solvent uptake in polymeric solids, with that of growing, describing the change of the relaxed state in a continuum body. Basing

Modeling liquid migration in active swollen gel spheres

Liquid migration in active soft solids is a very common phenomenon in Nature at different scales: from cells to leaves. It can be caused by mechanical as well as chemical actions. The work focuses on

Under Diffusion Control: from Structuring Matter to Directional Motion

The concept of dynamic instability is introduced and illustrated as an additional tool for the design of smart materials and actuators, with emphasis on the realization of motion even at the macroscopic scale.

Modeling solvent dynamics in polymers with solvent-filled cavities

Dynamics of solvent release from polymer gels with small solvent-filled cavities is investigated starting from a thermodynamically consistent and enriched multiphysics stress-diffusion model. Indeed,



Steady and transient analysis of anisotropic swelling in fibered gels

The swelling–induced mechanical response of homogeneous anisotropic gels under free conditions and uniaxial loading is investigated. Semi–analytical and numerical analyses show that fibers hamper

Force and stroke of a hydrogel actuator

Hydrogels that undergo a volume phase transition in response to an external stimulus are of great interest because of their possible use as actuator materials. The performance of an actuator material

Volume of polymer gels coupled to deformation

The experimental and theoretical studies on a rich variety of phenomena caused by the strain-induced volume change under various types of strain and force such as constant uniaxial strain, sinusoidal force, ultraslow stretching and compression, solvent flow, and ultracentrifugal force are summarized.

Thermally responsive rolling of thin gel strips with discrete variations in swelling

The process by which spatial variations in growth transform two-dimensional elastic membranes into three-dimensional shapes is both a fundamentally interesting mechanism of shape selection and a

Morphing of geometric composites via residual swelling.

The controlled growth-like morphing of 2D sheets into 3D shapes by preparing geometric composite structures that deform by residual swelling suggests that the controlled shaping of geometric composites may provide a simple complement to traditional manufacturing techniques.

Reorientation of cellulose nanowhiskers in agarose hydrogels under tensile loading.

Results show that a controlled drying of the hydrogel is essential to establish interactions between the matrix and the cellulose nanowhiskers which allow for a stress transfer during stretching and thereby promote their alignment.

Curled actuated shapes of ionic polymer metal composites strips

The curled actuated shapes of ionic polymer metal composites (IPMCs) are described within a nonlinear physics-based model of IPMC actuators. A key characteristic of the model is the refined, even if

Statistical Mechanics of Cross‐Linked Polymer Networks I. Rubberlike Elasticity

A model is proposed for the structure of a cross‐linked network, such as exists in a vulcanized rubber, which is amenable to statistical treatment. Expressions are derived for the structural entropy

Liquid crystalline inorganic nanosheets for facile synthesis of polymer hydrogels with anisotropies in structure, optical property, swelling/deswelling, and ion transport/fixation.

Macroscopically anisotropic hydrogels were synthesized by hybridization of poly(N-isopropylacrylamide) with liquid crystalline inorganic nanosheets; their anisotropies in the structure and properties