Swelling mechanism in smart polymers responsive to mechano-chemical stimuli

Brighenti, Roberto; Cosma, Mattia Pancrazio

doi:10.1016/j.jmps.2020.104011

Cited by 24 publications

(12 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, although our poro-hyperelastic model is able to couple large deformation and fluid flow, more advanced models considering the full coupling between the solvent diffusion and tissue swelling might be required, e.g. Hong et al (2008); Bouklas et al (2015a); Chen et al (2020); Brighenti and Cosma (2020). This would also allow us to implement a modified definition of the J -integral proposed for swelling materials, which is path-independent and computes the transient energy energy release rate by separating the energy lost in diffusion from the energy available to drive crack growth (Yang et al, 2006;Bouklas et al, 2015b).…”

Section: Discussionmentioning

confidence: 99%

Fluid-solid interaction in the rate-dependent failure of brain tissue and biomimicking gels

Terzano¹,

Spagnoli²,

Dini³

et al. 2021

Preprint

View full text Add to dashboard Cite

Brain tissue is a heterogeneous material, constituted by a soft matrix filled with cerebrospinal fluid.The interactions between, and the complexity of each of these components are responsible for the nonlinear rate-dependent behaviour that characterizes what is one of the most complex tissue in nature.Here, we investigate the influence of the cutting rate on the fracture properties of brain, through wire cutting experiments. We also present a model for the rate-dependent behaviour of fracture propagation in soft materials, which comprises the effects of fluid interaction through a poro-hyperelastic formulation.The method is developed in the framework of finite strain continuum mechanics, implemented in a commercial finite element code, and applied to the case of an edge-crack remotely loaded by a controlled displacement. Experimental and numerical results both show a toughening effect with increasing rates, which is linked to the energy dissipated by the fluid-solid interactions in the process zone ahead of the crack.

show abstract

Section: Discussionmentioning

confidence: 99%

Fluid-solid interaction in the rate-dependent failure of brain tissue and biomimicking gels

Terzano¹,

Spagnoli²,

Dini³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…To investigate the pH impact of initial salt solution on the adsorption of Cu(II) by hydrogels, solutions of Cu(OAc)2.H2O (10 ppm) with different pH values (2, 4, 6, 8, 10, 12 and 14) were prepared. Hydrogel (V) (0.01 g) was added to the aqueous solution of Cu(OAc)2.H2O (2 mL, 10 mg L -1 ) of varied pH values (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) and shacked for 24 h in order to achieve adsorption equilibrium at room temperature. Hydrogels were isolated by filtration and the filtrates were analyzed by ICP to determine the equilibrium concentration (Ce).…”

Section: Investigating the Effect Of Ph Of The Medium On The Adsorptionmentioning

confidence: 99%

“…Stimuli-responsive or smart polymers undergo an abrupt change in their physical or chemical properties concerning to small external stimuli like temperature [1], pH [2], magnetic or electric field [3], light intensity [4], biological molecules [5] and ionic strength [6]. These environmental stimuli produce a significant macroscopic and reversible alteration in the structure of smart polymers which include change in physical state, solubility, shape, conductivity, solvent interactions, variation of the hydrophilic-lipophilic balance and delivery of therapeutic agents [7][8][9]. Hydrogels are one type of these intelligent polymers which can be described as a cross linked 3-D network of hydrophilic synthetic or natural polymers.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Equilibrium Function and Switchable Catalytic Activity of Some Thermo-Responsive Hydrogel Metal Absorbents Based on Modified PNIPAM

Ghasemi

Owrang

Javaheri

2022

Preprint

View full text Add to dashboard Cite

Synthesis and identification of some thermo-responsive hydrogel metal absorbents based on Schiff base modified PNIPAM is described. PNIPAM hydrogel is produced through conventional free-radical polymerization method. The hydrogel is amino modified with different amines and then treated with various aldehydes to make polymeric Schiff-bases supposing to utilize as an absorbent for Cu salt. Characterization of the as-prepared hydrogels was performed properly and confirmed the corresponding structures. Kinetic and equilibrium function of the absorbents and the effect of distinct variables like pH, adsorbent amount and contact time in the absorption process are investigated in detail. Kinetic and adsorption isotherm data agreed with pseudo-second order model and Langmuir isotherm, respectively. The maximum value of adsorption capacity of the prepared adsorbent was around 8550 mg g-1. In addition, the corresponding switchable catalytic activity using one of the thermo-responsive hydrogel metal absorbents in the reduction of 4-nitro phenol to 4-amino phenol in the role of model reaction is examined.

show abstract

“…[1][2][3][4][5][6][7][8][9][10] Along with the development of stimulus-responsive smart materials, actuators with a dissipative structure can harvest energy and information from the external stimulus. Various types of stimulation modalities, i.e., electrical, [11] thermal, [12] optical, [13] magnetic, [14] and chemical stimulation [15] have been successfully applied to actuate the microstructures of intelligent devices. In particular, the actuation schemes that conform to the contactless driving strategy have received extensive attention due to their obvious advantages: i) omitting the electrical part to satisfy the requirements of lightweight and miniaturization of the actuator; ii) not requiring complex coupling, which allows a higher degree of freedom in manipulation, and iii) free of contacted energy source that may damage the microstructure and/or cause unreversible degradation.…”

Section: Introductionmentioning

confidence: 99%

Graphene Implanted Shape Memory Polymers with Dielectric Gene Dominated Highly Efficient Microwave Drive

Wang

Shu

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

Microwave‐driven strategy shows many advantages including selective energization, uniform heating, and high penetration depth, which is a hot topic in wireless actuators. Understanding microwave stimulus‐response mechanisms is the key to developing universal construction strategies for advanced microwave‐driven actuators. Herein, reduced graphene oxide (rGO) with specified dielectric genes and thermal properties is implanted into the shape memory polymer, liquid crystal elastomer (LCE) as an example, to construct soft, reversible, and sensitive microwave actuators. Based on the analysis of microstructure and dielectric properties, LCE‐rGO composites exhibit excellent polarization relaxation‐dominated dielectric loss and electromagnetic (EM) energy conversion ability. The maximum dielectric loss factor (ε″) and loss tangent (tan δe) of LCE‐rGO are dramatically increased by 216% and 87.5% compared to pure LCE, respectively, and the optimum apparent energy harvest efficiency is 19.4 times higher than that of LCE. In addition, the implantation of rGO significantly lowers the microwave actuation threshold of LCE‐rGO composites and reinforces their stimulus‐response capacity. Response time under 750 W microwave irradiation of LCE‐rGO is shortened to <10s. These findings can provide a solid basis for the design and fabrication of highly efficient microwave stimuli‐responsive polymers and enlighten a new approach to wireless actuated smart devices.

show abstract

Swelling mechanism in smart polymers responsive to mechano-chemical stimuli

Cited by 24 publications

References 44 publications

Fluid-solid interaction in the rate-dependent failure of brain tissue and biomimicking gels

Fluid-solid interaction in the rate-dependent failure of brain tissue and biomimicking gels

Kinetic and Equilibrium Function and Switchable Catalytic Activity of Some Thermo-Responsive Hydrogel Metal Absorbents Based on Modified PNIPAM

Graphene Implanted Shape Memory Polymers with Dielectric Gene Dominated Highly Efficient Microwave Drive

Contact Info

Product

Resources

About