Method and system for self-sustained fluctuation of light-driven artificial muscle and application
An artificial muscle and light-driven technology, applied in manufacturing tools, program-controlled manipulators, manipulators, etc., can solve problems such as the inability to realize independent wave propagation, failure to reach living bodies, and limited applications
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preparation example Construction
[0041] The preparation method of the artificial muscle provided by this program is as follows:
[0042] Use a mold to preliminarily shape the liquid crystal elastomer oligomer doped with a light absorber to obtain a sheet-like film precursor, uniaxially stretch the sheet-like film precursor and then continue to perform a cross-linking reaction to obtain a film, and cut the film into a certain size. A strip-shaped film can be used to obtain artificial muscles.
[0043] The sheet-like film precursor has a weakly cross-linked network formed by a chemical cross-linking reaction, and the formed incompletely cross-linked sheet-like film precursor is taken out from the mold, and then the sheet-like film precursor is subjected to uniaxial tensile strain. After the tensile strain is fixed, the stretched sheet-like film is induced and fixed by continuing the chemical cross-linking reaction, and an artificial muscle with multiple degrees of freedom contraction, expansion and deformation ...
preparation Embodiment 1
[0064] Preparation of artificial muscles:
[0065] According to RM82: the molar ratio of ketoacid cyanine dye is 9:1, the molar ratio of DODT:PETMP is 3:1, the molar ratio of reactant thiol group:acrylate group is 1:1, and the organic solvent is selected as dichloromethane, Shake for 30s and mix well. Add 4wt% DPA to the mixed solution as a catalyst. After shaking and dissolving, pour the precursor solution into a 3cm◇3cm◇0.5cm square mold. After reacting at room temperature for 3h, carefully peel off the mold to obtain Incompletely cross-linked film precursor; the prepared incompletely cross-linked film is stretched by 50% and fixed for 24h to make the thiol group and the acrylate group completely react and cross-link to cure to obtain a monodomain oriented liquid crystal elasticity body film. Finally, a strip-shaped rectangular structure was cut with a blade parallel to the orientation direction to serve as an artificial muscle.
Embodiment 1
[0067] A method for light-driven artificial muscles to generate torsional waves from continuous fluctuations:
[0068] The artificial muscle obtained in Preparation Example 1 is 15mm in length, 3mm in width, 0.12mm in thickness, and has a fixed distance of 12mm at both ends, as shown in figure 2 The artificial muscle is irradiated with a near-infrared light source, wherein the spot size of the near-infrared light source is 15mm × 15mm, and the light intensity is ~0.15W cm -2 , the incident angle is 20°, and the structured light spot is as image 3 shown.
[0069] Result: as Figure 4 As shown, after turning on the near-infrared light source, the artificial muscle produced a continuous torsional wave motion behavior with a frequency and amplitude of 0.7 Hz and 1.7 mm, respectively. Figure 4 The lower graph illustrates the periodic variation in amplitude and frequency of the torsional wave motion.
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