Pickering Emulsion Stabilization in SBS Composite Membranes
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Solution Overview
Problem
Incorporating hydrophilic functional agents into a hydrophobic matrix is challenging, as emulsion droplets tend to coalesce and phase separate during the templating process, requiring robust stabilization methods to maintain long-term stability and structure.
Innovation Solution
A controlled release composite membrane is developed using hydrophobic styrene-butadiene-styrene block copolymer as the continuous medium and Pickering emulsion droplets stabilized by hydrophobic silica nanoparticles, allowing for the homogeneous distribution and controlled release of anti-icing agents like potassium formate salt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If emulsion droplets are used as templates in a hydrophobic matrix, then the functional agents can be distributed throughout the matrix, but the emulsion droplets tend to coalesce and phase separate during the templating process
Solution Approach 1:
Hydrophobic silica nanoparticles are introduced as intermediary stabilizers at the interface between the hydrophilic emulsion droplets and the hydrophobic SBS matrix. The nanoparticles partially wet by both phases, anchoring themselves at the interface and preventing droplet coalescence and phase separation during the templating process.
Solution Approach 2:
The system forms a composite structure combining hydrophobic silica nanoparticles with hydrophilic emulsion droplets in a hydrophobic polymer matrix. This composite approach creates a stablePickering emulsion that maintains its structure throughout the templating process, enabling successful incorporation of functional agents.
2Adaptability or versatility
If hydrophilic functional agents are incorporated into a hydrophobic matrix, then the functional properties can be achieved, but the phase separation and coalescence occur
Solution Approach 1:
Hydrophobic silica nanoparticles serve as intermediary agents that enable the incorporation of hydrophilic functional agents into the hydrophobic SBS matrix. The nanoparticles stabilize the interface between immiscible phases, allowing functional agents to be distributed throughout the matrix without causing phase separation.
3Stability of the object's composition
If solid particles are used to stabilize emulsion interfaces instead of surface active molecules, then the emulsion stability is enhanced, but the particle selection and processing complexity increases
Solution Approach 1:
The patent utilizes the hydrophobicity parameter of silica nanoparticles to achieve stabilization. By controlling the hydrophobic character of the particles, the system achieves stablePickering emulsion without requiring complex stabilization mechanisms. The hydrophobic silica nanoparticles naturally affinity to the hydrophobic SBS matrix while still stabilizing the interface.
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 membrane exhibits enhanced mechanical strength and viscoelastic behavior, maintaining stability and controlled release of anti-icing agents, suitable for applications in asphalt surfaces and bitumen modification, while also being environmentally safe.
Implementation Method 1
small solid particles attach at fluid/fluid interfaces of two immiscible mediums when the particles are partially wettable by both mediums. This mechanism for use in emulsion templates due to their strong stability is known as 'Pickering emulsions'.
Implementation Method 2
The composite membrane exhibits enhanced mechanical strength and viscoelastic behavior, maintaining stability and controlled release of anti-icing agents
Data Source
Figure 1(a)~2(d)
Figure 3a~3b
Figure 4a~4b
AI summary
Present invention relates to a controlled released composite membrane comprising hydrophobic styrene-butadiene-styrene block copolymer (2) as hydrophobic continuous medium (5) and hydrophilic functional agents incorporated within silica nanoparticles (8) as hydrophilic dispersed medium (6) and a preparation process of said membrane.