Silica-alginate microgel capsules for tunable hydrophobic delivery
Innovative microgel capsules utilizing silica-alginate shells encapsulate oil-in-water nanoemulsions for controlled hydrophobic delivery. These capsules offer tunable release through adjustable alginate crosslinking, ideal for pharmaceuticals and cosmetics.
Overview
The proposed solution involves the development of silica-alginate microgel capsules designed for the tunable delivery of hydrophobic compounds. These capsules encapsulate oil-in-water nanoemulsions within a silica-reinforced alginate shell, allowing for precise control over the release of active ingredients. This technology is particularly beneficial for applications in pharmaceuticals and cosmetics, where controlled release and stability of hydrophobic actives are critical.
Technical specifications
- Capsule Structure: Composed of 5 to 15 um diameter alginate microspheres with a silica shell.
- Tunable Delivery: The nanoemulsion concentration and the alginate crosslinking serve as independent tuning mechanisms, allowing for controlled diffusion of active ingredients.
- Encapsulation Process: Utilizes acoustic extrusion to form calcium alginate beads, which are then coated with a silica shell through silanization.
- Material Compatibility: Capable of incorporating various surfactants, oils, and hydrophobic ingredients.
- Dynamic Control: Viscosity and mesh size of the alginate can be adjusted by modulating sodium and calcium ion ratios.
Technology readiness level
Currently at TRL 3, this technology is in the experimental proof of concept stage, with ongoing validations to optimize the synthesis process and evaluate release profiles using UV-vis spectroscopy.
About North Carolina State University
North Carolina State University is a large, comprehensive public land‑grant research university in Raleigh. Its on‑campus research and technology park co‑locates corporate R&D groups, government partners, and faculty labs, enabling shared facilities, prototyping, and agile contracting. Located in North Carolina’s Research Triangle, partners tap a dense regional ecosystem while engaging through a statewide extension network and a mature co‑op program that deliver field deployment and workforce pipelines. Multiple pilot and demonstration facilities support scale‑up and validation toward pre‑commercial readiness. Research is supported by competitive funding from major federal agencies, including NSF, USDA, DOE, and DOD, and a dedicated technology transfer office with clear IP pathways helps accelerate commercialization.
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