Continuous Disc Stack Centrifuge for Graphene Separation
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Solution Overview
Problem
Current methods for producing atomically thin 2-dimensional materials like graphene are inefficient, requiring lengthy centrifugation processes and resulting in low graphene concentrations, making them unsuitable for industrial-scale production.
Innovation Solution
A continuous disc stack centrifuge process is developed to efficiently separate submicron thickness laminar solid particles from a suspension, using a conical plate centrifuge with optimized parameters such as disc angle, number of discs, and rotational speed to achieve efficient separation of nano-platelets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional centrifugation methods are used to separate graphene platelets, then separation is achieved, but the process requires extremely long centrifugation times (45 minutes or more) and results in low graphene concentrations
Solution Approach 1:
The centrifuge is divided into multiple disc stacks arranged in series, creating multiple separation stages within a single continuous process. Each disc stack performs a portion of the separation task, and the suspension progresses through each stage sequentially, achieving complete separation much faster than a single centrifugation step
Solution Approach 2:
The process converts batch centrifugation into continuous flow centrifugation. The suspension continuously flows through the disc stack centrifuge, undergoing separation without interruption. This eliminates the idle time between batch cycles and maintains constant separation action throughout the process
2Manufacturing precision
If repeated centrifugation is performed to select graphene nano-platelets with few atomic layers, then thickness selection is achieved, but the process becomes extremely time-consuming and low-yielding
Solution Approach 1:
The thickness selection process is segmented into multiple disc stacks, each optimized for specific thickness ranges. The suspension passes through each stack in sequence, with each stack removing a specific fraction of platelet thicknesses, achieving precise thickness selection in a single continuous pass rather than repeated cycles
Solution Approach 2:
The process transitions from temporal repetition (multiple sequential centrifugation cycles) to spatial parallelism (multiple disc stacks arranged in series within one continuous flow path). This dimensional change allows simultaneous processing of different thickness fractions without time loss
3Measurement precision
If laboratory-scale centrifuges are used for graphene separation, then separation is achieved, but the method is not suitable for industrial-scale production
Solution Approach 1:
The disc stack centrifuge design serves multiple functions: it performs separation, concentration, and thickness selection all in one continuous process. The system can handle various suspensions and operate at different throughput rates, making it universally applicable from laboratory to industrial scale
Solution Approach 2:
The process parameters (flow rate, disc stack configuration, rotational speed) can be adjusted to match different production scales. The same fundamental design principles apply whether processing small laboratory samples or large industrial volumes, enabling seamless scaling
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 process enables rapid, scalable, and energy-efficient separation of nano-platelets, achieving high concentrations and improving productivity compared to traditional methods, with demonstrated effectiveness in separating graphene, boron nitride, and molybdenum disulphide nano-platelets.
Implementation Method 1
separating the solid suspension in the apparatus; wherein the solid suspension comprises the submicron thickness laminar solid particles in a liquid continuous phase
Data Source
AI summary
A system and a method of continuously separating submicron thickness laminar solid particles from a solid suspension, segregating the suspension into a submicron thickness particle fraction suspension and a residual particle fraction suspension, the method comprising the steps of; providing a continuous centrifuge apparatus; providing a suspension of submicron thickness laminar solid particles in a solid suspension; wherein the solid suspension comprises the submicron thickness solid particles in a liquid continuous phase; separating the solid suspension in the apparatus.