Adhesion / desorption control structure and method for interface reconstruction

Abstract

The invention discloses an adhesion / desorption control structure and method for interface reconstruction. The control structure comprises a two-layer structure, wherein the top layer is a dry adhesion structure layer; the bottom layer is an artificial muscle regulation layer, comprising an artificial muscle structure and a support structure; the dry adhesion structure layer is supported on the top of the artificial muscle structure and the support structure, and the bottom of the artificial muscle structure and the support structure are connected to a substrate; the method comprises the following steps: through the action of an external field, the artificial muscle structure contracts and deforms, resulting in reconstruction of the adhesion interface, so that the adhesion interface changes from a high-intensity adhesion state to a low-intensity adhesion state; in the low-intensity adhesion state, the adhesion / desorption structure with interface reconstruction is pulled to separate the dry adhesion structure layer from the adhesion interface of the adhered object, so as to achieve a controllable desorption effect; when the external field is removed, the artificial muscle structure restores its original morphology under the action of elasticity, and the dry adhesion structure layer is restored; the invention realizes flexible regulation of the contact area, thereby achieving high-intensity adhesion and controllable desorption.

Description

Technical Field

[0001] The invention belongs to the technical field of micro-nano engineering bionic design, and in particular relates to an adhesion / desorption control structure and method for interface reconstruction. Background Art

[0002] In the application process of dry adhesion structure surface, how to achieve high-strength adhesion and controllable desorption is an important aspect in the field of dry adhesion research. Del Campo et al. from the Max Planck Institute in Germany found that mushroom-shaped structures can achieve high-strength adhesion characteristics, but due to the symmetry of the morphology, the mushroom-shaped array structure shows equal adhesion strength in all directions and cannot achieve effective and controllable desorption; Professor Mentin Sitti of Carnegie Mellon University, Professor Jacob N. Israelachvili of the University of California, Santa Barbara, and others studied anisotropic structural functional surfaces based on tilted microstructure arrays, which can achieve controllable desorption of dry adhesion surfaces, but the premise is at the expense of adhesion strength.

[0003] Under the premise of ensuring the adhesion strength, regulating the contact area is also an effective way to achieve desorption. However, how to flexibly regulate the contact area is a difficult problem currently faced. Therefore, the flexible regulation of the contact area is a technical difficulty in achieving high-strength adhesion and controllable desorption. Summary of the invention

[0004] In order to solve the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an adhesion / desorption control structure and method for interface reconstruction, so as to realize flexible regulation of the contact area, thereby achieving high-strength adhesion and controllable desorption.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An interface reconstructed adhesion / desorption control structure comprises a two-layer structure, wherein the top layer is a dry adhesion structure layer 2; the bottom layer is an artificial muscle regulation layer, comprising an artificial muscle structure 3 and a support structure 4; the dry adhesion structure layer 2 is supported on the top of the artificial muscle structure 3 and the support structure 4, and the bottom of the artificial muscle structure 3 and the support structure 4 are connected to a substrate 5.

[0007] The dry adhesion structure layer 2 is a mushroom-shaped array structure.

[0008] The dry adhesion structure layer 2 is made of elastomeric material; the artificial muscle structure 3 is made of columnar flexible intelligent material, and the flexible intelligent material is embedded with heating wires; the support structure 4 is made of a columnar structure of a high elastic modulus material.

[0009] The elastic material is polydimethylsiloxane (PDMS), the flexible intelligent material is liquid crystal elastic polymer (LCE), and the high elastic modulus material is Teflon.

[0010] A method for controlling an adhesion / desorption structure using an interface reconstruction comprises the following steps:

[0011] In the first step, without the action of an external field, the artificial muscle structure 3 maintains the initial morphology, and the adhesion interface between the dry adhesion structure layer 2 and the adhered object 1 is in a high-strength adhesion state;

[0012] In the second step, an external field is added. The heat generated by the electric heating wire causes the artificial muscle structure 3 to undergo thermal contraction deformation, resulting in reconstruction of the adhesion interface between the dry adhesion structure layer 2 and the adhered object 1. The contact area between the top dry adhesion region and the adhered object 1 gradually decreases, causing the adhesion interface to change from a high-strength adhesion state to a low-strength adhesion state.

[0013] The third step is to pull the adhesion / desorption structure reconstructed at the interface under the low-strength adhesion state, so that the adhesion interface between the dry adhesion structure layer 2 and the adhered object 1 is separated to achieve a controllable desorption effect;

[0014] In the fourth step, the external field is removed, the artificial muscle structure 3 recovers its original shape under the action of elasticity, and the dry adhesion structure layer 2 is restored.

[0015] The beneficial effects of the present invention are as follows: the present invention can regulate the artificial muscle structure through an external field while maintaining the high adhesion strength of the dry adhesion structure, resulting in reconstruction of the adhesion interface and flexible regulation of the contact area, thereby achieving high-strength adhesion and controllable desorption; the control method of the present invention can be widely used in technical fields such as drone hosting, robot enhanced operation, and medical assistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the control structure in a high-strength adhesion state when no external field is applied.

[0017] Figure 2 Schematic diagram of the control structure in the low-strength adhesion state when an external field is applied.

[0018] Figure 3 Schematic diagram of interface separation in a low-strength adhesion state when an external field is applied to the control structure.

[0019] Figure 4 Schematic diagram of the restoration of the dry adhesion structure layer when the external field is removed from the control structure. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings.

[0021] Reference Figure 1-Figure 4, an interface reconstructed adhesion / desorption control structure, comprising a two-layer structure, the top layer is a dry adhesion structure layer 2, the dry adhesion structure layer 2 is a mushroom-shaped array structure; the bottom layer is an artificial muscle regulation layer, including an artificial muscle structure 3 and a support structure 4; the dry adhesion structure layer 2 is supported on the top of the artificial muscle structure 3 and the support structure 4, and the bottom of the artificial muscle structure 3 and the support structure 4 are connected to the substrate 5.

[0022] The dry adhesion structure layer 2 is made of elastomeric materials such as polydimethylsiloxane (PDMS); the artificial muscle structure 3 is made of flexible intelligent materials such as columnar liquid crystal elastic polymer (LCE), and the flexible intelligent materials are embedded with heating wires; the support structure 4 is made of a columnar structure made of high elastic modulus materials such as Teflon.

[0023] A method for controlling an adhesion / desorption structure using an interface reconstruction comprises the following steps:

[0024] In the first step, without the action of an external field, the artificial muscle structure 3 maintains its initial shape and does not shrink or deform, and the adhesion interface between the dry adhesion structure layer 2 and the adhered object 1 is in a high-strength adhesion state, such as Figure 1 As shown;

[0025] The second step is to add an external field. In this embodiment, an electric field is used. The electric heating wire generates an electrothermal effect under the action of the external electric field. The heat generated causes the artificial muscle structure 3 to shrink and deform due to heat, resulting in the reconstruction of the adhesion interface between the dry adhesion structure layer 2 and the adhered object 1. The contact area between the top dry adhesion area and the adhered object 1 is gradually reduced, so that the adhesion interface is changed from a high-strength adhesion state to a low-strength adhesion state. Figure 2 As shown;

[0026] In the third step, under the low-strength adhesion state, the adhesion / desorption structure reconstructed at the interface is gently pulled to separate the adhesion interface between the dry adhesion structure layer 2 and the adhered object 1, thereby achieving a controllable desorption effect, such as Figure 3 As shown;

[0027] In the fourth step, the external field is removed, and the artificial muscle structure 3 recovers its original shape under the action of elasticity, and the dry adhesion structure layer 2 is restored, as shown in FIG. Figure 4 shown.

[0028] The present invention regulates the artificial muscle structure through an external field, resulting in reconstruction of the adhesion interface, and realizing flexible regulation of the contact area, thereby achieving high-strength adhesion and controllable desorption.

Claims

1. An adhesion / desorption control structure for interface reconstruction, characterized in that: The invention comprises a two-layer structure, wherein the top layer is a dry adhesion structure layer (2); the bottom layer is an artificial muscle regulation layer, which comprises an artificial muscle structure (3) and a support structure (4); the dry adhesion structure layer (2) is supported on the top of the artificial muscle structure (3) and the support structure (4), and the bottom of the artificial muscle structure (3) and the support structure (4) are connected to a substrate (5); The dry adhesive structure layer (2) is made of an elastomeric material; The artificial muscle structure (3) uses a columnar flexible smart material, and the flexible smart material is embedded with an electric heating wire; The supporting structure (4) adopts a columnar structure made of a material with a high elastic modulus; The elastic material is polydimethylsiloxane (PDMS), the flexible intelligent material is liquid crystal elastic polymer (LCE), and the high elastic modulus material is Teflon.

2. The adhesion / desorption control structure of interface reconstruction according to claim 1, characterized in that: The dry adhesion structure layer (2) is a mushroom-shaped array structure.

3. A method for utilizing the adhesion / desorption control structure of interface reconstruction according to claim 1, comprising the following steps: In the first step, without the action of an external field, the artificial muscle structure (3) maintains the initial morphology, and the adhesion interface between the dry adhesion structure layer (2) and the adhered object (1) is in a high-strength adhesion state; In the second step, an external field is added, and the heat generated by the electric heating wire causes the artificial muscle structure (3) to undergo thermal contraction deformation, resulting in reconstruction of the adhesion interface between the dry adhesion structure layer (2) and the adhered object (1), and the contact area between the top dry adhesion region and the adhered object (1) is gradually reduced, so that the adhesion interface is transformed from a high-strength adhesion state to a low-strength adhesion state; The third step is to pull the adhesion / desorption structure reconstructed at the interface under the low-strength adhesion state, so that the adhesion interface between the dry adhesion structure layer (2) and the adhered object (1) is separated, thereby achieving a controllable desorption effect; In the fourth step, the external field is removed, and the artificial muscle structure (3) recovers its original shape under the action of elasticity, and the dry adhesion structure layer (2) is restored.

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