Study on the behavior of a temperature-sensitive hydrogel micro-channel via FSI and non-FSI approaches

Amiri, Arya; Mazaheri, Hashem

doi:10.1007/s00707-020-02673-z

Cited by 10 publications

(7 citation statements)

References 33 publications

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“…This amount of leakage which exists because of the offset in simulation is negligible. It is remarkable that this amount of leakage is originated due to the 5 kPa inlet pressure, which is a larger amount than the ones assumed in several previous studies (Amiri and Mazaheri, 2020;Mazaheri et al, 2018). The lower the inlet pressure is, the smaller amount of leakage the hydrogel valve has.…”

Section: Resultsmentioning

confidence: 61%

“…In other words, not only the resultant fluid pressure is applied to the solid structure, but also regarding the deformation of the solid structure, the fluid domain is updated. Most of the previous FSI analyses have been carried out in the equilibrium states (Amiri and Mazaheri, 2020;Arbabi et al, 2017;Khanjani et al, 2020;Mazaheri et al, 2018;Zhang et al, 2012). However, the transient swelling process of hydrogels cannot be observed in such studies.…”

Section: Introductionmentioning

confidence: 99%

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PH-sensitive hydrogel-based valves: A transient fully-coupled fluid-solid interaction study

Niroumandi

Shojaeifard

Baghani

2021

Journal of Intelligent Material Systems and Structures

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pH-sensitive hydrogels are promising materials to be employed in microfluidic devices, especially microvalves. In this paper, a theory of transient swelling of pH-sensitive micro-valve is presented. A transient constitutive model that captures electrical, chemical, and mechanical fields is considered to model the swelling phenomenon. The diffusion of ions into the hydrogel, the electromigration, and convection are described by implementing the Nernst-Planck equation. Assuming Gent model, hydrogel is considered as a compressible hyperelastic material and osmotic pressure is assumed as an external loading. Due to benefits of in-plane valves, a design of the micro-valve is studied. Design simplicity and great sealing are vital factors which can be considered as an advantage of this valve for fabrication. This design and modeling approach has not been used for pH-sensitive hydrogels in earlier works. Thus, we have studied the transient swelling of pH-sensitive hydrogel microvalve, when effects of fluid-structure-interaction are examined on valve performance. It is noted that in most previous studies, equilibrium conditions have been assumed. While considering transient fully-coupled fluid-structure-interaction is necessary to capture a more realistic modeling. The results illustrate that the microvalve blocks the channel much earlier than reaching the equilibrium-state, which implies importance of the transient behavior of hydrogels.

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Section: Resultsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

PH-sensitive hydrogel-based valves: A transient fully-coupled fluid-solid interaction study

Niroumandi

Shojaeifard

Baghani

2021

Journal of Intelligent Material Systems and Structures

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“…Hydrogels may imbibe solvent molecules in their polymeric chains and then swell upon diffusion of the solvents. This swelling phenomenon brings interesting applications in microfluidic systems (Amiri and Mazaheri, 2020) such as drug delivery systems (Gharehnazifam et al, 2021;Hoare and Kohane, 2008), micro-valves (Ghasemkhani et al, 2021;Mazaheri et al, 2018), micro-pumps (Richter et al, 2009), actuators (Nourian et al, 2020), self-folding devices (Guan et al, 2005), grippers (Yoon, 2019), biosensors (Dolatabadi et al, 2022;Goh et al, 2017Goh et al, , 2019, and cell immobilization (Jen et al, 1996). Depending on different features, hydrogels can be divided into various categories.…”

Section: Introductionmentioning

confidence: 99%

Transient swelling of cylindrical hydrogels under coupled extension-torsion: Analytical and 3D FEM solutions

Amiri

Baniassadi

Bayat

et al. 2022

Journal of Intelligent Material Systems and Structures

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To design more accurate soft sensors and actuators, there is a significant requirement for the application of complicated deformation conditions. Coupled extension-torsion is a type of deformation which may be utilized in the property characterization of materials with complex behavior such as soft hydrogels. Hydrogels with coupled diffusion and large deformation behavior have intricate kinetics which should be studied in detail. In this work, a robust semi-analytical procedure is proposed to capture the transient behavior of cylindrical hydrogels in combined loading of extension and torsion in different conditions. Moreover, the whole problem with the same conditions is simulated in COMSOL-Multiphysics as a verification framework of the proposed semi-analytical procedure, where comparing the results shows a good agreement. The results demonstrate that the transient behavior of the cylindrical hydrogel under coupled extension-torsion is significantly dependent on the rate of the deformation and material properties. Besides, since the hydrogel undergoes a highly nonlinear swelling in this deformation regime, the simulations predict a complicated reaction force and moment. Visualizing the effect of different parameters engaged in the material shows the robust behavior of the proposed semi-analytical procedure, which can be employed in constitutive models’ calibration as well as in the design and optimization of hydrogels structures.

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“…To understand the kinematic performance of a linkage, many scholars have been proposing different theories (McCarthy, 1990;Duffy, 1996;Davidson and Hunt, 2004;Dai, 2014;Zhao et al, 2016;Amiri and Mazaheri, 2020;Faghidian and Mohammad-Sedighi, 2020), methods (Angeles, 1982;Kong et al, 2018;Yang et al, 2018;Kong et al, 2019;Shen et al, 2020), algorithms (García de Jalón and Bayo, 1994;Kong et al, 2016;Saura et al, 2019) and software (Brát and Lederer, 1973;García de Jalón and Bayo, 1994;Wu et al, 2009;Wu et al, 2017). This paper focuses on an algorithm in the screw coordinates to solve the velocity of articulated planar linkage and investigates the displacement and acceleration.…”

Section: Introductionmentioning

confidence: 99%

Kinematics of Articulated Planar Linkages

Zhao

Wei

2021

Front. Mech. Eng.

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This paper proposes a kinematics algorithm in screw coordinates for articulated linkages. As the screw consists of velocity and position variables of a joint, the solutions of the forward and inverse velocities are the functions of position coordinates and their time derivatives. The most prominent merit of this kinematic algorithm is that we only need the first order numerical differential interpolation for computing the acceleration. To calculate the displacement, we also only need the first order numerical integral of the velocity. This benefit stems from the screw the coordinates of which are velocity components. Both the forward and the inverse kinematics have the similar calculation process in this method. Through examples of planar open-chain linkage, single closed-chain linkage and multiple closed-chain linkage, the kinematics algorithm is validated. It is particularly fit for developing numerical programmers for forward and inverse kinematics in the same procedures, including the velocity, displacement and acceleration which provide the fundamental information for dynamics of the linkage.

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Study on the behavior of a temperature-sensitive hydrogel micro-channel via FSI and non-FSI approaches

Cited by 10 publications

References 33 publications

PH-sensitive hydrogel-based valves: A transient fully-coupled fluid-solid interaction study

PH-sensitive hydrogel-based valves: A transient fully-coupled fluid-solid interaction study

Transient swelling of cylindrical hydrogels under coupled extension-torsion: Analytical and 3D FEM solutions

Kinematics of Articulated Planar Linkages

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