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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  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
Publication Date:
OSTI Identifier:
1198456
Grant/Contract Number:
AC04-94AL85000
Type:
Published Article
Journal Name:
Journal of Nanomaterials
Additional Journal Information:
Journal Volume: 2011; Related Information: CHORUS Timestamp: 2016-08-04 11:34:33; Journal ID: ISSN 1687-4110
Publisher:
Hindawi Publishing Corporation
Sponsoring Org:
USDOE
Country of Publication:
Egypt
Language:
English