Soft Materials Driven by Photothermal Effect and Their Applications

Bisoyi, Hari Krishna; Urbas, Augustine; Li, Quan

doi:10.1002/9783527816774.ch1

Cited by 16 publications

(14 citation statements)

References 205 publications

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“…As the temperature increases, liquid crystal mesogens transition from the nematic phase to the isotropic phase, leading to a notable and macroscopic deformation in the material. A variety of LCE-based actuating structures have been designed and successfully fabricated, which are often actuated by direct environmental heating (26,27) or by light through photothermal and photochemical effects (28)(29)(30)(31)(32)(33)(34). However, for most practical applications, electronically powered actuators pro-vide notable convenience for system control and integration.…”

Section: Introductionmentioning

confidence: 99%

Electrically controlled liquid crystal elastomer–based soft tubular actuator with multimodal actuation

et al. 2019

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Soft tubular actuators can be widely found both in nature and in engineering applications. The benefits of tubular actuators include (i) multiple actuation modes such as contraction, bending, and expansion; (ii) facile fabrication from a planar sheet; and (iii) a large interior space for accommodating additional components or for transporting fluids. Most recently developed soft tubular actuators are driven by pneumatics, hydraulics, or tendons. Each of these actuation modes has limitations including complex fabrication, integration, and nonuniform strain. Here, we design and construct soft tubular actuators using an emerging artificial muscle material that can be easily patterned with programmable strain: liquid crystal elastomer. Controlled by an externally applied electrical potential, the tubular actuator can exhibit multidirectional bending as well as large (~40%) homogenous contraction. Using multiple tubular actuators, we build a multifunctional soft gripper and an untethered soft robot.

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Section: Introductionmentioning

confidence: 99%

Electrically controlled liquid crystal elastomer–based soft tubular actuator with multimodal actuation

et al. 2019

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“…The photothermal effect refers to the phenomenon in which light energy is converted into thermal energy [ 1 , 2 ]. This effect is utilized in various applications, e.g., for measuring thermal properties [ 3 , 4 , 5 ] and for laser hair removal, scar removal, and anticancer treatment in the medical field [ 6 , 7 , 8 ]. In photothermal therapy, tumor tissue is killed by increasing its temperature using a laser (light energy) in the presence of a photothermal conversion agent.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Photothermal Therapy Treatment Effect under Various Laser Irradiation Conditions

Kim

2022

IJMS

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The photothermal effect refers to a phenomenon in which light energy is converted into heat energy, and in the medical field, therapeutics based on this phenomenon are used for anticancer treatment. A new treatment technique called photothermal therapy kills tumor tissue through a temperature increase and has the advantages of no bleeding and fast recovery. In this study, the results of photothermal therapy for squamous cell carcinoma in the skin layer were analyzed numerically for different laser profiles, intensities, and radii and various concentrations of gold nanoparticles (AuNPs). According to the heat-transfer theory, the temperature distribution in the tissue was calculated for the conditions under which photothermal therapy was performed, and the therapeutic effect was quantitatively confirmed through three apoptotic variables. In addition, the laser intensity and the volume fraction of AuNPs were optimized, and the results provide useful criteria for optimizing the treatment effects in photothermal therapy.

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“…Light is a powerful actuation stimulus due to the possibilities offered for specifying complex spatiotemporal responses through patterning of wavelength, mode, and polarization. [1][2][3] To convert photon energy into mechanical work, photomechanical actuators are typically composed of a photoactive moiety embedded within a solid matrix, wherein a photochemical 4,5 or photothermal 6 effect triggers a macroscopic response. Among the most widely used are azobenzene-based systems, where molecular-scale conformational changes via cis-trans photoisomerization are harnessed to generate mechanical stress.…”

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confidence: 99%

Reversible Actuation via Photoisomerization-Induced Melting of a Semicrystalline Poly(Azobenzene)

et al. 2020

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Photoisomerization of azobenzene in polymer matrices is a powerful method to convert photon energy into mechanical work. While most previous studies have focused on incorporating azobenzene within amorphous or liquid crystalline materials, the limited extents of molecular ordering and correspondingly modest enthalpy changes upon switching in such systems has limited the achievable energy densities. In this work, we introduce a semi-crystalline main-chain poly(azobenzene) where photoisomerization is capable of reversibly triggering melting and re-crystallization under essentially isothermal conditions. These materials can be drawn into aligned fibers, yielding optically-driven two-way shape memory actuators capable of reversible bending. Scheme 1. Preparation of semi-crystalline poly(azobenzene)s ASSOCIATED CONTENT Supporting Information The Supporting Information is available free of charge on the ACS Publications website.

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Soft Materials Driven by Photothermal Effect and Their Applications

Cited by 16 publications

References 205 publications

Electrically controlled liquid crystal elastomer–based soft tubular actuator with multimodal actuation

Electrically controlled liquid crystal elastomer–based soft tubular actuator with multimodal actuation

Optimization of Photothermal Therapy Treatment Effect under Various Laser Irradiation Conditions

Reversible Actuation via Photoisomerization-Induced Melting of a Semicrystalline Poly(Azobenzene)

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