Structured Organic Films via Pre-SOF Assembly
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Solution Overview
Problem
Conventional covalent organic frameworks (COFs) lack control over molecular-level structure and patterning, resulting in materials with random organization and limited applications due to their amorphous nature and poor control over macroscopic properties.
Innovation Solution
Structured organic films (SOFs) are developed, which are defect-free, macroscopic covalent organic frameworks with controlled segment and linker combinations, allowing for enhanced properties such as photoconductivity and tailored functionalities by arranging molecular building blocks into specific patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional COF synthesis methods are used, then molecular building blocks can be linked into networks, but the molecular-level structure and patterning remain random and uncontrolled
Solution Approach 1:
The patent applies preliminary action by pre-assembling molecular building blocks into defined structures (such as pre-formed oligomers or structured precursors) before the final network formation step. This pre-organization of components enables controlled molecular-level patterning in the final COF structure, transforming the random assembly process into a directed self-assembly pathway that achieves high manufacturing precision without proportionally increasing process complexity
Solution Approach 2:
The patent utilizes parameter changes by systematically varying synthesis conditions including temperature profiles, solvent compositions, catalyst types and concentrations, and reaction time sequences. These parameter modifications enable transition from random polymerization to controlled crystalline network formation, achieving precise molecular-level structure control through optimized reaction parameters that guide self-assembly into desired patterns
2Adaptability or versatility
If conventional COFs are synthesized as powders with high porosity, then they achieve low density and high gas storage capacity, but they lack macroscopic film structure and have limited practical applications
Solution Approach 1:
The patent applies dimensionality change by transitioning from zero-dimensional powder particles to two-dimensional macroscopic films while preserving the three-dimensional network structure within. This is achieved through directed self-assembly on substrates or between substrates, where molecular building blocks organize into extended planar networks that form continuous films. The resulting SOFs maintain the high porosity and low density of conventional COFs while gaining macroscopic structural definition and mechanical integrity for practical applications
Solution Approach 2:
The patent utilizes the thin film principle by synthesizing covalent organic frameworks as continuous two-dimensional membranes with controlled thickness. These SOFs are formed as free-standing or substrate-supported films that combine the molecular-level porosity of conventional COFs with macroscopic film morphology. The flexible approach allows the framework to maintain its porous structure while achieving the mechanical and structural properties necessary for applications such as separation membranes, coatings, and integrated device components
3Ease of manufacture
If molecular building blocks are arranged randomly in conventional COFs, then synthesis is simpler, but the materials exhibit limited functionality and poor control over macroscopic properties
Solution Approach 1:
The patent applies local quality by incorporating different molecular building blocks with specific functionalities at different locations within the COF network. Through controlled self-assembly, the patent creates regions with distinct properties (such as catalytic sites, chromophores, or functional groups) positioned at specific locations in the framework. This spatial arrangement of functional units enables tailored functionalities while maintaining overall synthesis feasibility through directed self-assembly processes that organize components according to their molecular recognition properties
Data Source
AI summary
A processes for preparing structured organic film (SOF) comprising a plurality of segments and a plurality of linkers arranged as a covalent organic framework, wherein the structured organic film may be a multi-segment thick structured organic film.