Polymer Particle Topology Control via Emulsifier Tuning
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Solution Overview
Problem
Current methods for forming polymeric particles, such as those used in drug delivery, struggle to consistently control the surface characteristics and topology, particularly when incorporating drugs, leading to unintended consequences and inefficient release profiles.
Innovation Solution
A method involving an emulsion/condensation process is developed, where the concentration of a second emulsifier in the organic phase is modified to control the topology of polymeric particles, allowing for the formation of particles with predetermined morphologies and topologies, including high surface area or smooth surfaces, by adjusting the solubility and miscibility of solvents and emulsifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emulsion/condensation methods are used to form polymeric particles, then particles can be formed in a relatively consistent fashion, but the surface characteristics and topology cannot be consistently controlled
Solution Approach 1:
The patent applies parameter changes by systematically varying the concentration of the second emulsifier in the organic phase to control particle topology. By adjusting this specific parameter (emulsifier concentration), the method achieves consistent control over surface characteristics while maintaining reliable particle formation through the emulsion/condensation process.
Solution Approach 2:
The second emulsifier acts as an intermediary substance that mediates between the organic phase and aqueous phase, influencing the particle formation process. This intermediary component specifically controls the topology and surface characteristics of the resulting polymeric particles without compromising the overall formation consistency.
2Adaptability or versatility
If materials are added to the formation process to deliver drugs, then drug delivery functionality is achieved, but unintended consequences occur on particle morphology and topology
Solution Approach 1:
The second emulsifier serves as an intermediary that allows drug materials to be incorporated into the particle formation process without causing unintended morphological changes. It mediates the interaction between the drug-containing organic phase and the aqueous phase, maintaining precise control over particle topology even when drug delivery materials are present.
Solution Approach 2:
The method applies local quality by specifically controlling the distribution and concentration of the second emulsifier within the organic phase to achieve uniform particle topology. This localized control ensures that drug delivery functionality is achieved without compromising the uniformity and precision of particle morphology.
3Area of stationary object
If the concentration of the second emulsifier is increased to achieve high surface area topology, then particle surface area increases, but the complexity of the formation process increases
Solution Approach 1:
The patent resolves this contradiction by changing a single key parameter - the concentration of the second emulsifier in the organic phase. By adjusting this one parameter, the method achieves high surface area topology without requiring complex formation processes, as the emulsifier concentration change directly influences particle morphology through the emulsion/condensation mechanism.
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 approach enables the production of particles with controlled morphology and topology, enhancing drug loading and release characteristics, as well as cell and tissue interactions, resulting in improved targeted delivery and reduced off-target effects.
Implementation Method 1
combining an aqueous phase with an organic phase to form an emulsion that includes droplets of the organic phase dispersed in the aqueous phase
Implementation Method 2
The aqueous phase can include water and a first emulsifier. The organic phase can include a first solvent, a second solvent, a polymer, and a second emulsifier
Implementation Method 3
removing at least a portion of the first solvent from the organic phase, upon which the polymer can solidify to form polymeric particles
Implementation Method 4
emulsion/condensation approach in which a two-phase emulsion is formed with the polymer contained in the dispersed phase. As solvent is removed from the dispersed phase, the polymer solidifies
Data Source
AI summary
Methods for forming polymeric particles with a predetermined, controlled morphology, and methods for tuning the topology of polymeric particles through modification of components utilized in the formation process are described. An emulsion/condensation technique is used, including a first emulsifier in the aqueous phase and an organic phase that includes first and second solvents, a second emulsifier, and a polymer. The polymer is more soluble in the first solvent than the second solvent, and the second emulsifier is more soluble in the second solvent than the first solvent. Through modification of the relative amounts of the emulsifiers and solvents, particles with either smooth or rough surfaces can be formed. Particles are particularly useful as drug depots with controlled-release profiles.