PMID- 12733889
OWN - NASA
STAT- MEDLINE
DCOM- 20030702
LR  - 20081121
IS  - 0002-7863 (Print)
IS  - 0002-7863 (Linking)
VI  - 125
IP  - 19
DP  - 2003 May 14
TI  - Self-assembly of an environmentally responsive polymer/silica nanocomposite.
PG  - 5626-7
AB  - Thermoresponsive nanocomposite thin films composed of alternating layers of 
      silica and polymerized N-isopropylacrylamide (NIPAM) or NIPAM plus dodecyl 
      methacrylate (DM) hydrogels were prepared by surfactant-directed 
      evaporation-induced self-assembly (EISA). During EISA, the organic monomers 
      partition within the hydrophobic domains of a lamellar mesophase. In-situ 
      polymerization via a free radical process results in a 1-2 nm thick hydrogel 
      phase sandwiched between layers of silica oriented parallel to the substrate 
      surface. The thermoresponsiveness of PNIPAM is preserved in this confined 
      environment, and the polymeric layers reversibly swell and deswell by a factor of 
      2 in water upon temperature changes around the transition temperature of PNIPAM 
      (32 degrees C). The composition, mesostructure, and environmental response were 
      studied by detailed NMR, TGA, and SAXS analyses.
FAU - Garnweitner, Georg
AU  - Garnweitner G
AD  - Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, New 
      Mexico 87131, USA.
FAU - Smarsly, Bernd
AU  - Smarsly B
FAU - Assink, Roger
AU  - Assink R
FAU - Ruland, Wilhelm
AU  - Ruland W
FAU - Bond, Evelyn
AU  - Bond E
FAU - Brinker, C Jeffrey
AU  - Brinker CJ
LA  - eng
PT  - Journal Article
PT  - Research Support, U.S. Gov't, Non-P.H.S.
PL  - United States
TA  - J Am Chem Soc
JT  - Journal of the American Chemical Society
JID - 7503056
RN  - 0 (Acrylic Resins)
RN  - 0 (Methacrylates)
RN  - 0 (Polymers)
RN  - 0 (Surface-Active Agents)
RN  - 0 (dodecyl methacrylate)
RN  - 1343-98-2 (Silicic Acid)
RN  - 25189-55-3 (poly-N-isopropylacrylamide)
MH  - Acrylic Resins/*chemistry
MH  - Hot Temperature
MH  - Hydrogen-Ion Concentration
MH  - Methacrylates/*chemistry
MH  - *Nanotechnology
MH  - Polymers/*chemical synthesis/chemistry
MH  - Silicic Acid/*chemistry
MH  - Surface-Active Agents/chemistry
OID - NASA: 00030509
GN  - NASA: Grant numbers: DOE DE-AC04-94AL85000, DOD MURI 318651.
EDAT- 2003/05/08 05:00
MHDA- 2003/05/08 05:01
CRDT- 2003/05/08 05:00
PHST- 2003/05/08 05:00 [pubmed]
PHST- 2003/05/08 05:01 [medline]
PHST- 2003/05/08 05:00 [entrez]
AID - 10.1021/ja0342648 [doi]
PST - ppublish
SO  - J Am Chem Soc. 2003 May 14;125(19):5626-7. doi: 10.1021/ja0342648.