Photoresponsive Release from Azobenzene-Modified Single Cubic Crystal NaCl/Silica Particles

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Journal of Nanomaterials

DOI:https://doi.org/10.1155/2011/439756· OSTI ID:1198456

Jiang, Xingmao ^[1]; Liu, Nanguo ^[2]; Assink, Roger A. ^[3]; Jiang, Yingbing ^[4]; Brinker, C. Jeffrey ^[5]

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1. Department of Chemical and Nuclear Engineering and Center for Micro-Engineered Materials, The University of New Mexico, Albuquerque, NM 87106, USA
2. SCB Innovation Accelerator, Dow Corning Corporation, 2200 W. Salzburg Road, P.O. Box 0994, Midland, MI 48686, USA
3. Advanced Material Laboratory, Sandia National Laboratories, Albuquerque, NM 87185, USA
4. Transmission Electron Microscopy Labs, The University of New Mexico, Albuquerque, NM 87131, USA
5. Department of Chemical and Nuclear Engineering and Center for Micro-Engineered Materials, The University of New Mexico, Albuquerque, NM 87106, USA, Advanced Material Laboratory, Sandia National Laboratories, Albuquerque, NM 87185, USA

Azobenzene ligands were uniformly anchored to the pore surfaces of nanoporous silica particles with single crystal NaCl using 4-(3-triethoxysilylpropylureido)azobenzene (TSUA). The functionalization delayed the release of NaCl significantly. The modified particles demonstrated a photocontrolled release by trans/cis isomerization of azobenzene moieties. The addition of amphiphilic solvents, propylene glycol (PG), propylene glycol propyl ether (PGPE), and dipropylene glycol propyl ether (DPGPE) delayed the release in water, although the wetting behavior was improved and the delay is the most for the block molecules with the longest carbon chain. The speedup by UV irradiation suggests a strong dependence of diffusion on the switchable pore size. TGA, XRD, FTIR, and NMR techniques were used to characterize the structures.

• Sponsoring Organization: USDOE
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1198456
• Journal Information: Journal of Nanomaterials, Journal Name: Journal of Nanomaterials Vol. 2011; ISSN 1687-4110
• Publisher: Hindawi Publishing Corporation
• Country of Publication: Egypt
• Language: English