Supramolecular Coating for Stable Fluid Self-Assembly of Micro Devices
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Solution Overview
Problem
Existing fluid self-assembly technologies face issues such as insufficient assembly force between micro devices and the assembly substrate, complex preparation processes due to three-dimensional structures, difficulty in achieving surface selectivity and post-repair, and challenges in simultaneously assembling multiple types of micro devices.
Innovation Solution
A low-modulus supramolecular coating with complementary supramolecular functional groups applied to micro devices and assembly substrates, utilizing orthogonal and complementary supramolecular interactions for oriented assembly, followed by stimulus-induced bonding and repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If shape matching or capillary force is used for assembly, then micro devices can be assembled on the substrate, but the assembly force is insufficient and micro devices may disengage due to fluid flow
Solution Approach 1:
The patent introduces a supramolecular coating as an intermediary layer between the micro device and the substrate. This coating contains supramolecular functional groups that form strong interactions with complementary groups on the substrate, providing sufficient assembly force to resist fluid flow while maintaining stable assembly.
Solution Approach 2:
The patent uses composite supramolecular functional groups that combine multiple interaction mechanisms (hydrogen bonding, pi-pi stacking, metal coordination) to create a coating with enhanced assembly force and stability, overcoming the limitations of single-mechanism assembly methods.
2Manufacturing precision
If three-dimensional structures such as grooves or protrusions are provided on the assembly substrate, then oriented assembly can be achieved, but the preparation process becomes complex involving lithography and microfabrication
Solution Approach 1:
The patent replaces the mechanical three-dimensional structure system (grooves, protrusions) with a chemical supramolecular interaction system. The substrate surface is modified with supramolecular functional groups that provide orientation through chemical recognition, eliminating the need for complex mechanical structures and their associated fabrication processes.
Solution Approach 2:
The patent changes the assembly mechanism from physical shape matching to chemical supramolecular interaction. By modifying the surface chemistry of the substrate with supramolecular functional groups, the system achieves oriented assembly through chemical parameters rather than mechanical geometric parameters.
3Manufacturing precision
If additional structures are added to micro devices to achieve surface selectivity, then assembly specificity can be improved, but the complexity of device preparation increases
Solution Approach 1:
The patent applies supramolecular functional groups locally on the specific surfaces of micro devices that require assembly. This localized modification provides surface selectivity without requiring complex additional structures throughout the entire device, maintaining simplicity while achieving precise assembly control.
4Strength
If soldering or other fixation methods are used after assembly, then micro devices can be fixed on the substrate, but post-repair becomes difficult as the fixation cannot be selectively removed
Solution Approach 1:
The patent employs dynamic supramolecular interactions that can be reversibly activated and deactivated through external stimuli such as temperature, pH, or light. This dynamic特性 allows the assembly to be strongly fixed during operation but easily removed for repair when needed, overcoming the irreversibility of traditional soldering methods.
Solution Approach 2:
The supramolecular coating can be selectively removed from failed micro devices while leaving the substrate intact, enabling easy replacement of defective components. The coating acts as a temporary, removable layer that facilitates both strong assembly and simple disassembly for repair purposes.
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
Enhances assembly stability, simplifies preparation processes, achieves high-precision surface-selectivity, and facilitates simultaneous assembly of multiple device types without additional structures, reducing post-repair complexity.
Implementation Method 1
the low-modulus supramolecular coating applied to the surfaces of the micro devices and the low-modulus supramolecular coating applied to assembly positions on the assembly substrate contain complementary supramolecular functional groups
Implementation Method 2
Fluid self-assembly, as one of the most promising mass transfer technologies, has received widespread attentions
Data Source
AI summary
The present application provides a low-modulus supramolecular coating and a fluid self-assembly method, which are applied to micro devices and assembly substrate. The modulus of the low-modulus supramolecular coating is 10 MPa or less, and the surface thereof has fluidity; and the low-modulus supramolecular coating is applied to the surfaces of micro devices and the surface of an assembly substrate, and the low-modulus supramolecular coating applied to the surfaces of the micro devices and the low-modulus supramolecular coating applied to assembly positions on the assembly substrate contain complementary supramolecular functional groups. The present application solves the problems in existing fluid self-assemble whereby the transfer efficiency is low, the structure of an assembly substrate is complex, subsequent repairing is difficult, and it is difficult to realize simultaneous classification and assembly of various micro devices.