Cellulose acetate for a humidity-responsive self-actuator bilayer composite

Khoshtinat, Shiva; Carvelli, Valter; Marano, Claudia

doi:10.1007/s10570-023-05342-1

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Ansys, Comsol and Abaqus are three kinds of widely used commercial FEA tools/software in the fields of engineering and academic research. Many researchers employed Ansys [20][21][22], Comsol [23][24][25][26][27] and Abaqus [28][29][30][31][32][33][34][35][36][37] to study the properties of novel materials and simulate morphing behaviors of various actuators. However, the biaxially anisotropic Young's modulus and CTE of the BAPs cannot be well described in all these FEA software by defining material properties.…”

Section: The Methodology Of Feamentioning

confidence: 99%

The modeling method and simulation study on the biaxially anisotropic polymer films

Li,

2024

Smart Mater. Struct.

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Biaxially anisotropic polymer (BAP) films are very common materials, usually prepared by stretching linear polymers along two orthogonal directions in sequence. Most molecular chains of BAPs are oriented in the two stretching directions with a crossed arrangement, leading to unique properties of BAP films. However, the theoretical and simulation studies on BAPs and BAP-based devices are few until now. Here, we developed entity modeling methods to successfully simulate actual BAPs: through constructing the model of crossed rebars embedded in matrix, which respectively imitate crossed molecular chains and inter-chain van der Waals interactions, the mechanical properties of the BAP films/strips can be reproduced. Different from uniaxially anisotropic polymers, the longitudinal Young’ moduli of BAP strips have two maxima in 0°/90° directions, and their coefficients of thermal expansion (CTEs) also have two maxima in ±45° directions. By introducing asymmetry, the BAP film model becomes from symmetric to moderately asymmetric and then to highly asymmetric: the ratio of two modulus maxima (in 0°/90°) increases (from 1 to 1.13, then to 1.22), and the directions of maximum CTEs also change (from ±45° to ±35°, then to ±27°), making the simulated BAP films closer to reality. Moreover, we systematically studied the helical morphing behaviors of the BAP-based bimorph actuator by finite element simulations. The chirality of this strip actuator is reversed four times, while its cutting angle changes within 180°. Besides, as the asymmetry of BAP film increases, the angle of chirality reversion of the BAP-based actuators changes from ±45° to ±60°, then to ±70°.

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Section: The Methodology Of Feamentioning

confidence: 99%

The modeling method and simulation study on the biaxially anisotropic polymer films

Li,

2024

Smart Mater. Struct.

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“…Discoloration behavior in humidity-responsive CLCPAs can be achieved through bending or swelling caused by uneven humidity or moisture absorption. By capitalizing on the unique properties of CLCPAs, researchers can continue to innovate and develop new technologies that leverage humidity-responsive materials [ 193 , 194 ] for a variety of practical applications. Besides their humidity-responsive behavior, cholesteric liquid crystal photonic actuators (CLCPAs) can also demonstrate responsiveness to magnetic fields, presenting intriguing possibilities for dynamic modulation and control [ 195 ].…”

Section: Dynamically Adjustable Cholesteric Liquid Crystal Structural...mentioning

confidence: 99%

Beyond Color Boundaries: Pioneering Developments in Cholesteric Liquid Crystal Photonic Actuators

Zhang,

Yang

et al. 2024

Micromachines

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Creatures in nature make extensive use of structural color adaptive camouflage to survive. Cholesteric liquid crystals, with nanostructures similar to those of natural organisms, can be combined with actuators to produce bright structural colors in response to a wide range of stimuli. Structural colors modulated by nano-helical structures can continuously and selectively reflect specific wavelengths of light, breaking the limit of colors recognizable by the human eye. In this review, the current state of research on cholesteric liquid crystal photonic actuators and their technological applications is presented. First, the basic concepts of cholesteric liquid crystals and their nanostructural modulation are outlined. Then, the cholesteric liquid crystal photonic actuators responding to different stimuli (mechanical, thermal, electrical, light, humidity, magnetic, pneumatic) are presented. This review describes the practical applications of cholesteric liquid crystal photonic actuators and summarizes the prospects for the development of these advanced structures as well as the challenges and their promising applications.

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Smart Bioinspired Material‐Based Actuators: Current Challenges and Prospects

Palacios,

Chiriatti,

Poppinga

et al. 2024

Advanced Intelligent Systems

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This research review discusses several examples of plant movements, either depending on the direction of the triggering stimuli (tropisms) or not (nastic responses), which have served as inspiration to develop smart biomimetic actuators. In addition, it presents an overview of the multiple approaches for the development of autonomous actuators based on synthetic materials, as well as of their advantages and disadvantages, applicability, and limitations. The classification is based on structural and conformational characteristics (mono‐, bi‐, or multimaterial assemblies, their orientation, chemical structures, and geometrical configurations). Additionally, this review presents an alternative formulation and extension of the pioneering Timoshenko's model, which provides an understanding of the underlying mechanical principle of bilayer bending actuation. Finally, upscaled applications of this actuation principle are described, focusing mainly on biomimetic architecture. Attention is given to previously reported real‐life applications based on bio‐based materials and material systems. Furthermore, this review discusses the multiple challenges for synthetic materials when an upscaling perspective is intended. In this sense, key aspects such as time responsiveness and mechanical amplification, in terms of speed, displacement, and load‐bearing capability, are discussed.

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Cellulose acetate for a humidity-responsive self-actuator bilayer composite

Cited by 6 publications

References 41 publications

The modeling method and simulation study on the biaxially anisotropic polymer films

The modeling method and simulation study on the biaxially anisotropic polymer films

Beyond Color Boundaries: Pioneering Developments in Cholesteric Liquid Crystal Photonic Actuators

Smart Bioinspired Material‐Based Actuators: Current Challenges and Prospects

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