Light-Stimuli Coordination Polymer for Photoactuator Design
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Solution Overview
Problem
Current light-responsive materials face challenges in amplifying photoinduced stress from molecular level to macroscopic deformation, limiting their practical application in photoactuated devices and biomimetic materials due to anisotropic optical-mechanical behavior and crystallinity.
Innovation Solution
A light-stimuli responsive coordination polymer [Zn(tkpvb)(Fb)2]n is synthesized with a simple preparation method and mild reaction conditions, capable of undergoing a [2+2] cycloaddition reaction under 365 nm light irradiation, generating a photoinduced stress that is amplified through a composite film to achieve rapid and accurate mechanical deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If light-responsive molecular moieties are inserted into networks, gels and molecular crystals to achieve fast and reversible light-driven deformation behaviors, then the response speed and reversibility are improved, but the anisotropic optical-mechanical behavior and crystallinity limit the macroscopic deformation and amplify the design complexity
Solution Approach 1:
The patent changes the chemical structure parameters of the ligand (introducing azobenzene groups with specific substituents) and coordination geometry to create a coordination polymer with isotropic optical-mechanical behavior, resolving the anisotropy issue while maintaining fast response speed
Solution Approach 2:
The patent creates a composite structure by coordinating metal ions with organic ligands containing light-responsive moieties, forming a coordination polymer that combines the advantages of both inorganic and organic components to achieve fast response while simplifying the overall design
2Force
If photoinduced stress is generated at the molecular level through chemical reaction of photosensitive molecules in the CP backbone, then the molecular-level stress generation is achieved, but the macroscopic deformation is insufficient and requires stress amplification methods
Solution Approach 1:
The patent segments the stress generation and amplification functions into distinct structural levels: molecular-level photoinduced stress generation through azobenzene isomerization, and macroscopic stress amplification through the coordination polymer's supramolecular structure and composite film architecture
Solution Approach 2:
The patent transitions from molecular-level (nanoscale) photoinduced stress to macroscopic (macroscale) deformation by utilizing the extended supramolecular structure of the coordination polymer and the dimensional amplification provided by the composite film configuration
3Stability of the object's composition
If coordination polymers are used to insert light-responsive molecular moieties into highly ordered and specially arranged CP backbone, then the structural orderliness and periodicity are improved, but the photoinduced stress cannot cause significant macroscopic deformation without amplification methods
Solution Approach 1:
The patent optimizes the coordination geometry and ligand structure parameters to create a coordination polymer with high structural orderliness that simultaneously possesses the capability for significant macroscopic deformation through light-induced structural transitions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coordination polymer enables the development of high-sensitivity photoactuators that can perform various mechanical behaviors under UV light, offering non-contact, non-damage, and precise volume adjustment, suitable for photoactuated devices and biomimetic applications.
Implementation Method 1
capable of undergoing a [2+2] cycloaddition reaction under 365 nm light irradiation, generating a photoinduced stress that is amplified through a composite film to achieve rapid and accurate mechanical deformation
Data Source
AI summary
The invention provides a light-stimuli responsive coordination polymer, and preparation method and use thereof. The coordination polymer has a chemical formula of [Zn(tkpvb) (Fb)2]n1, wherein Fb represents p-fluorobenzoate, tkpvb represents 1,2,4,5-tetrakis((E)-2-(4-pyridyl)vinyl)benzene, and n=3000-60000; and crystallographic parameters of: (1) crystal system: monoclinic system; (2) space group: C2/c; (3) a=28.577(3)Å, b=7.4084(6) Å, c=22.612(3) Å, β=126.771(2)°, and V=3834.8(7) Å3; (4) Z=4; and (5) F(000)=1720, R1=0.0440, wR2=0.1042, and GOF=1.047. The method is simple, and has mild reaction conditions, and fast light conversion rate. The means of light-stimuli responsiveness are non-contact and non-damage type, the volume adjustment is highly accurate, and the whole adjustment process does not require any chemical reagents, and is safe and reliable. Photoactuators can complete a variety of behaviors under the irradiation of ultraviolet light having a wavelength of 365 nm.