Diamond Particle Cluster Separation via Surface Functionalization
Solution Overview
Problem
Existing methods for separating diamond particle clusters, such as wet-stirred-media-milling and chemical functionalization, fail to produce well-dispersed diamond particles in both solution and dry powder form, as the particles tend to re-aggregate after drying, limiting their applications and end uses.
Innovation Solution
A method involving the combination of diamond particle clusters with organic or inorganic compounds in a solvent to react with dangling bonds on the surface, followed by mechanical means like shaking or ultrasonication to break clusters into discrete particles, preventing re-aggregation by saturating the surface bonds with the added compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If wet-stirred-media-milling is used to separate diamond particle clusters, then the clusters are broken up and dispersed in water, but the nanodiamonds re-agglomerate after drying
Solution Approach 1:
The patent applies preliminary action by treating the diamond particle clusters with a liquid phase compound containing reactive groups (such as carboxylic acid, hydroxyl, or amine groups) before mechanical separation. This pre-treatment modifies the surface chemistry of the diamond particles, creating functional groups that prevent re-aggregation during and after the separation process. The reactive groups on the particle surface interact with the liquid phase compound to form a protective layer that maintains dispersion stability.
Solution Approach 2:
The patent changes the chemical parameters of the diamond particle surface by introducing functional groups through reaction with liquid phase compounds. This modification alters the surface energy and chemical properties of the particles, transforming them from hydrophobic to hydrophilic or chemically active surfaces that resist agglomeration. The parameter change involves modifying the surface chemistry from pure carbon to functionalized surfaces with specific chemical groups.
2Stability of the object's composition
If acid treatment is used to de-aggregate nanodiamond particles, then carboxylic acid groups are formed on the surface, but the particles still re-aggregate after drying
Solution Approach 1:
The patent uses liquid phase compounds containing reactive groups as intermediaries between the diamond particle surface and the dispersion medium. These intermediaries (such as compounds with carboxylic acid, hydroxyl, or amine groups) react with the diamond surface to form a protective functional layer that mediates the interaction between particles and the surrounding environment, preventing direct particle-particle contact and re-aggregation.
Solution Approach 2:
The patent creates composite structures at the particle surface by combining diamond cores with functionalized surface layers. The resulting particles have a composite nature where the diamond core maintains the original properties while the surface layer provides functional groups that prevent agglomeration. This composite approach integrates the benefits of both the diamond material and the functional coating.
3Stability of the object's composition
If metal hydroxide is used to disperse nanodiamonds in solution, then electrical repulsion between particles is increased, but the nanodiamonds re-aggregate after drying
Solution Approach 1:
The patent replaces the mechanical/physical mechanism of metal hydroxide dispersion with a chemical functionalization approach. Instead of relying on ionic repulsion from metal hydroxide to maintain dispersion, the patent uses chemical reactions to introduce functional groups on the particle surface that provide steric and chemical stability. This substitution of mechanism allows the particles to remain dispersed without requiring the presence of metal ions that would cause re-aggregation upon drying.
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
This method effectively separates diamond particle clusters into discrete, well-dispersed particles in both dry powder and solution forms, enhancing their usability and stability by preventing re-aggregation through surface functionalization.
Implementation Method 1
the at least one organic or inorganic compound reacts with dangling-bonds present on the diamond particle surface
Implementation Method 2
using mechanical means to break up the diamond particle clusters into discrete diamond particles
Implementation Method 3
The invention also relates to a process for the functionalization of separated diamond particles
Data Source
AI summary
A method for the separation of diamond particle clusters into discrete diamond particles and/or into smaller diamond particle clusters comprising fewer diamond particles is disclosed.The diamond particle clusters are combined with at least one liquid phase organic or inorganic compound, or with a solution of at least one organic or inorganic compound in at least one solvent to form a reaction mixture. Mechanical means are then used to separate the diamond particle clusters into discrete diamond particles and/or into smaller clusters within the reaction mixture producing diamond particles with dangling bonds or free bonding sites on the surface of the diamond particles. The at least one organic or inorganic compound then reacts with these dangling bonds present on the diamond particle surface. The surfaces of the diamond particles are functionalized by the reaction with the organic or inorganic compounds and the diamond particles and/or smaller clusters produced are well dispersed in dry powder form, as well as in solution.