Surface-Modified Metal Oxide Particles for Solvent Stability
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Solution Overview
Problem
Existing surface-modified metal oxide and semimetal oxide particles lack stability in large amounts of solvents and surface-active substances, leading to detachment of silicon compounds from the particle surface.
Innovation Solution
A stable mixture of surface-modified particles is achieved by reacting metal oxide or semimetal oxide particles with silicon-comprising compounds and solvents, using specific silicon-based compounds like those of the general formula R1n—Si(OR2)4-n or polysiloxanes, which are then used in systems with high solvent-to-particle mass ratios and agglomeration-deagglomeration cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If metal oxide or semimetal oxide particles are functionalized on the surface by means of silicon-comprising compounds, then hydrophobic modification is achieved, but stability in large amounts of solvents and surface-active substances is insufficient leading to detachment of silicon compounds
Solution Approach 1:
The patent uses composite material structures by combining metal oxide or semimetal oxide particles with silicon-comprising compounds to create surface-modified particles. The silicon compounds form a stable coating layer on the particle surface that provides both hydrophobicity and enhanced stability in solvent environments, preventing detachment of the modifying compounds.
Solution Approach 2:
The patent employs specific silicon-comprising compounds with defined chemical structures (containing Si-O-Si bonds and organic functional groups) to modify the particle surface. By changing the chemical parameters of the surface coating - using compounds with specific bond strengths and molecular structures - the stability in large amounts of solvents and surface-active substances is significantly improved while maintaining hydrophobic properties.
2Stability of the object's composition
If hydrophobic modification is effected by reaction with silanes, then surface hydrophobicity is achieved, but stability in large amounts of solvents is not sufficient
Solution Approach 1:
The patent creates composite surface structures by reacting metal oxide or semimetal oxide particles with silicon-comprising compounds. This composite approach forms a robust silicon-based coating that maintains hydrophobicity while providing exceptional stability even when particles are exposed to large amounts of solvents, addressing the limitation of conventional silane modifications.
Solution Approach 2:
The patent changes the chemical parameters of the surface modification by using silicon-comprising compounds with specific structural characteristics (Si-O-Si bonds, organic functional groups) that provide both hydrophobicity and solvent resistance. This parameter optimization allows the modified particles to maintain their hydrophobic properties stable even in high solvent-to-particle mass ratios exceeding 500.
3Productivity
If particles are used in agglomeration-deagglomeration cycles, then productivity is improved, but repeated use leads to loss of surface modification and detachment of silicon compounds
Solution Approach 1:
The patent employs composite material structures with strongly bonded silicon-comprising compounds on particle surfaces. This composite design ensures that the surface modification remains intact during repeated agglomeration-deagglomeration cycles, enabling the particles to maintain their functionality and hydrophobic properties throughout multiple reuse cycles without significant detachment of silicon compounds.
Solution Approach 2:
The patent optimizes the chemical parameters of the surface coating by using silicon-comprising compounds that form stable bonds with the particle surface. This parameter optimization - specifically the bond strength and molecular structure of the silicon compounds - allows the particles to withstand the mechanical and chemical stresses of repeated agglomeration-deagglomeration cycles, significantly extending their operational lifetime and reusability.
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 modified particles maintain stability and integrity in high solvent concentrations and surface-active environments, allowing for repeated use in processes like agglomeration and deagglomeration without detachment of silicon compounds, enhancing their reuse in applications such as water purification and recycling.
Implementation Method 1
reacting metal oxide or semimetal oxide particles with at least one compound selected from among silicon-comprising compounds bearing one, two or three alkoxy radicals
Implementation Method 2
The modified particles maintain stability and integrity in high solvent concentrations and surface-active environments
Data Source
AI summary
The present invention relates to a stable mixture comprising surface-modified particles which are obtained by reacting metal oxide or semimetal oxide particles with at least one compound selected from among silicon-comprising compounds bearing one, two or three alkoxy radicals and at least one solvent, at least one surface-active substance or a mixture thereof, the use of these particles in systems in which they are brought into contact with at least one solvent, where the mass ratio of solvent to modified particle is greater than 500, and also the use of these particles in agglomeration-deagglomeration cycles.