A Voltage-Responsive Free-Blockage Controlled-Release System Based on Hydrophobicity Switching.

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Mesoporous silica nanomaterials (MSNs) show promise for controlled release but often suffer from poor sealing and biocompatibility.
• Existing physical blocking units on MSNs have limitations in sealing ability, biocompatibility, and closure.
• There is a need for advanced controlled-release systems with improved responsiveness and reliability.

Purpose of the Study:

• To develop a voltage-responsive controlled-release system using ferrocene-functionalized MSNs.
• To engineer a system capable of free-blockage and pulsatile release of encapsulated cargoes.
• To overcome the limitations of traditional physical blocking units in MSN-based delivery systems.

Main Methods:

• Functionalization of mesoporous silica nanomaterial (MSN) nanopores with ferrocene.
• Utilizing the hydrophobic-to-hydrophilic transition of ferrocene upon voltage application to control cargo release.
• Implementing a pulsatile release mechanism triggered by electrical stimuli.

Main Results:

• A voltage-responsive controlled-release system based on ferrocene-functionalized MSNs was successfully constructed.
• The system demonstrated effective blockage of cargo release in the absence of voltage due to hydrophobic nanopores.
• Upon application of a suitable voltage, nanopores became hydrophilic, enabling solution invasion and cargo release in a pulsatile manner.

Conclusions:

• The developed ferrocene-functionalized MSNs provide a highly effective blockage mechanism for controlled release applications.
• The voltage-responsive and pulsatile release capabilities offer advantages over existing MSN-based systems.
• This system holds potential for applications in electrical stimulation combination therapy and bioelectricity-responsive release.