Humic Acid-Derived Conductive Foam Production
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Solution Overview
Problem
Current methods for producing graphene and graphene foams are inefficient, requiring large amounts of undesirable chemicals, high energy, and generating significant waste, with resulting products being expensive, brittle, and unsuitable for mass production due to limitations in control over porosity and scalability.
Innovation Solution
A humic acid-derived foam is developed, which can be converted into a foamed structure with high structural integrity, offering thermal and electrical conductivity comparable to graphite foams, through a process involving heat treatment and optional use of a blowing agent, allowing for flexible design and control of porosity and pore sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (chemical formation and reduction of graphene oxide) are used to produce graphene and graphene foams, then graphene-like materials can be obtained, but the process requires large amounts of undesirable chemicals, high energy consumption, and generates significant waste
Solution Approach 1:
The patent converts the harmful chemical oxidation process into a beneficial approach by using natural humic acid as a precursor that contains pre-formed graphene-like structures. Instead of creating graphene oxide through harsh chemical oxidation and then reducing it, the invention directly uses humic acid's inherent graphene-like architecture, eliminating the need for toxic oxidants and reductants while maintaining the desired conductive properties
Solution Approach 2:
The patent replaces expensive, complex multi-step chemical processes with a simple, direct thermal decomposition method. By using humic acid as a cheap, readily available precursor and applying straightforward heat treatment, the invention eliminates the need for costly chemicals and complex processing equipment, making the production process economically viable and environmentally friendly
2Reliability
If conventional methods are used to produce graphene foams, then conductive materials can be obtained, but the resulting products are expensive and brittle, unsuitable for mass production
Solution Approach 1:
The patent changes the fundamental parameter of the precursor material from chemically synthesized graphene oxide to naturally derived humic acid. This parameter change enables the use of simple thermal processing instead of complex chemical synthesis, allowing for scalable manufacturing while maintaining the conductive properties needed for electronic applications
Solution Approach 2:
The patent extracts and utilizes the pre-existing graphene-like structures within humic acid molecules, eliminating the need for complex chemical formation processes. By taking out the valuable graphene-like architecture from the natural humic acid precursor and preserving it through simple thermal treatment, the invention achieves both scalability and maintained conductivity without expensive processing
3Reliability
If conventional methods are used to produce graphene foams, then materials can be obtained, but control over porosity and pore sizes is limited
Solution Approach 1:
The patent introduces dynamic control mechanisms during the thermal processing stage, where parameters such as heating rate, temperature profile, and atmosphere can be adjusted to dynamically control the formation and size of pores. This dynamic approach allows precise control over porosity and pore size distribution, enabling optimization for specific applications while maintaining scalable production
4Reliability
If carbon nano-tubes are used as conductive materials, then unique mechanical, electrical and chemical properties are achieved, but they are difficult to produce, extremely expensive, and difficult to disperse in solvent or water
Solution Approach 1:
The patent creates a simplified copy of the desirable properties of carbon nano-tubes and graphene by using humic acid as a precursor that naturally contains graphene-like structures. Instead of attempting to produce pure carbon nano-tubes or graphene through difficult processes, the invention uses humic acid's inherent architecture as a template, achieving similar conductive and mechanical properties through a much simpler, more scalable process that also provides better dispersibility
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 humic acid-derived foam achieves high thermal and electrical conductivity, mechanical robustness, and scalability, overcoming the limitations of existing methods by reducing chemical usage, energy consumption, and environmental impact, while enabling mass production of conductive and flexible graphene-like materials.
Implementation Method 1
heat treating the dried layer of humic acid at a first heat treatment temperature from 80° C. to 3,200° C. at a desired heating rate sufficient to induce formation and releasing of volatile gas molecules from the non-carbon elements
Implementation Method 2
heat treating the dried layer of humic acid at a first heat treatment temperature from 80° C. to 3,200° C. at a desired heating rate sufficient to activate the blowing agent for producing humic acid-derived foam
Data Source
AI summary
A process for producing a humic acid (HA)-derived foam, comprising: (a) preparing a HA dispersion having multiple HA molecules and an optional blowing agent dispersed in a liquid medium having a blowing agent-to-HA weight ratio from 0/1.0 to 1.0/1.0; (b) dispensing and depositing the HA dispersion onto a surface of a supporting substrate to form a wet HA layer; (c) partially or completely removing liquid medium from the wet HA layer to form a dried HA layer; and (d) heat treating the dried HA layer at a first heat treatment temperature from 80° C. to 3,200° C. at a desired heating rate sufficient to induce volatile gas molecules from the non-carbon elements or to activate the blowing agent for producing the HA-derived foam.