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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
Published on: March 21, 2014
A light-responsive reversible molecule-gated system using thymine-modified mesoporous silica nanoparticles.
Dinggeng He1, Xiaoxiao He, Kemin Wang
1State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 8, 2012
Summary
This study presents a reversible light-responsive system using mesoporous silica nanoparticles (MSN) and thymine derivatives. The system controls molecule release via UV light, enabling applications like light-switchable oxygen sensing.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Mesoporous silica nanoparticles (MSN) offer high surface area and tunable pore sizes for drug delivery and sensing.
- Light-responsive materials are crucial for controlled release and advanced sensor technologies.
- Thymine derivatives provide a biocompatible platform for light-induced molecular interactions.
Purpose of the Study:
- To design and demonstrate a reversible light-responsive molecule-gated system using MSN functionalized with thymine derivatives.
- To investigate the light-induced mechanism for controlled loading and release of guest molecules.
- To evaluate the system's potential as a light-switchable oxygen sensor.
Main Methods:
- Functionalization of MSN with thymine derivatives.
- UV light irradiation (365 nm and 240 nm) to induce photodimerization and photocleavage of thymine.
- Loading and release studies using Ruthenium(II) tris(bipyridine) ([Ru(bipy)(3)(2+)]) as a model guest molecule.
- Evaluation of the system's reversibility and performance as an oxygen sensor.
Main Results:
- Successful design of a light-responsive gated system based on MSN-thymine.
- UV light (365 nm) induced pore blockage via thymine photodimerization, inhibiting guest molecule diffusion.
- UV light (240 nm) triggered photocleavage, opening pores and releasing guest molecules.
- High loading capacity (53 μmol g(-1) MSN) and controlled release (82% in 24 h) of [Ru(bipy)(3)(2+)].
- Demonstrated good reversibility in loading and release cycles.
- Potential application as a light-switchable oxygen sensor.
Conclusions:
- The developed MSN-thymine system offers a robust and reversible platform for light-controlled molecular release.
- The system exhibits excellent performance in loading capacity and controlled release kinetics.
- The light-responsive gated system holds promise for advanced sensing applications, including light-switchable oxygen sensing.
