Composite Particle Surface Modification for Stable Emulsions
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Solution Overview
Problem
Existing methods for preparing amphiphilic particles for stabilizing oil/water interfaces, such as Pickering emulsions, face challenges including instability of surface active properties over time, difficulty in controlling and measuring surface modification, and the need for harmful reagents and purification processes.
Innovation Solution
A composite particle comprising a hydrophilic cellulose core and hydrophobic shell particles, where the surface of the core is discontinuously covered by the shell particles, is prepared using a mechanochemical fusion process, allowing for stable and controlled surface active properties without the need for harmful reagents or purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adsorption of small molecules or polymer chains is used for surface treatment, then amphiphilic particles can be prepared, but the adsorbed molecules tend to detach from the surface over time and surface active properties are lost
Solution Approach 1:
The hydrophobic particles are pre-synthesized with specific surface properties before being combined with hydrophilic core particles. This preliminary preparation ensures that the hydrophobic surface is already formed and stable, eliminating the need for subsequent adsorption that would lead to detachment over time.
Solution Approach 2:
The invention uses a composite structure combining hydrophilic core particles with hydrophobic shell particles. This composite approach creates a stable amphiphilic particle where the hydrophobic surface is an integral part of the structure rather than a loosely adsorbed layer, preventing detachment and maintaining surface active properties long-term.
2Adaptability or versatility
If covalent bonding of small molecules is used for surface treatment, then the surface can be controlled to be between hydrophilic and hydrophobic, but the surface active properties may be insufficient and harmful reagents are required
Solution Approach 1:
The invention replaces harmful covalent bonding reagents with a physical particle assembly approach using hydrophobic particles. This substitution eliminates the need for toxic chemicals while maintaining surface property control, as the hydrophobic particles can be easily attached and adjusted without harmful agents.
Solution Approach 2:
The hydrophobic particles serve as intermediaries between the hydrophilic core and the external environment. Instead of using harmful covalent reagents to modify the core surface, the hydrophobic particles mediate the surface properties through physical attachment, providing the desired amphiphilic character without toxic substances.
3Productivity
If pulverizing or grinding is used to prepare amphiphilic particles, then particles can be produced, but it is difficult to precisely control the amphiphilic properties
Solution Approach 1:
The amphiphilic particle is segmented into distinct hydrophilic core and hydrophobic shell components. This segmentation allows independent optimization and control of each part's properties before assembly, enabling precise control of overall amphiphilic characteristics while maintaining high production efficiency through modular preparation.
Solution Approach 2:
Both the hydrophilic core particles and hydrophobic shell particles are prepared in advance with controlled properties. This preliminary action allows precise control of each component's characteristics before assembly, ensuring the final composite particle has the desired amphiphilic properties without requiring post-processing adjustments.
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 composite particle maintains sufficient surface active properties for long-term stabilization of Pickering emulsions, enabling stable oil-in-water emulsions and providing enhanced cosmetic and UV shielding effects without the drawbacks of traditional methods.
Implementation Method 1
a composite particle comprising: at least one hydrophilic core particle comprising at least one cellulose or derivative thereof chosen from cellulose esters and ethers; and a plurality of hydrophobic particles
Implementation Method 2
Amphiphilic particles tend to aggregate at the interface between oil and water. Recently, several types of amphiphilic particles (surface active particles) are used for the stabilization of oil/water interfaces. Emulsions with the oil/water interface stabilized by amphiphilic particles are called 'Pickering emulsions'.
Data Source
AI summary
The present invention relates to a composite particle comprising: at least one hydrophilic core particle; and a plurality of hydrophobic particles, wherein the surface of the hydrophilic core particle is substantially discontinuously covered by the hydrophobic particles. The novel composite particle according to the present invention can have surface active properties sufficient to prepare stable Pickering emulsions, and can maintain the surface active properties over a long period of time. The present invention also relates to a method for preparing the above composite particle.