PMID- 18444673
OWN - NLM
STAT- MEDLINE
DCOM- 20080805
LR  - 20171116
IS  - 1520-6106 (Print)
IS  - 1520-5207 (Linking)
VI  - 112
IP  - 20
DP  - 2008 May 22
TI  - Unperturbed volume transition of thermosensitive poly-(N-isopropylacrylamide) 
      microgel particles embedded in a hydrogel matrix.
PG  - 6309-14
LID - 10.1021/jp711939v [doi]
AB  - The thermoresponsive behavior of poly-(N-isopropylacrylamide) (PNiPAM) microgels 
      embedded in a covalently cross-linked polyacrylamide hydrogel matrix was 
      investigated using ultraviolet-visible (UV-vis) spectroscopy, small-angle neutron 
      scattering (SANS), and confocal laser scanning microscopy. The hydrogel synthesis 
      was performed at two different temperatures, below and above the volume phase 
      transition temperature of PNiPAM, resulting in highly swollen or fully collapsed 
      PNiPAM microgel particles during the incorporation step. UV-vis spectroscopy 
      experiments verify that the incorporation of thermosensitive microgels leads to 
      temperature-sensitive optical properties of the composite materials. SANS 
      measurements at different temperatures show that the thermosensitive swelling 
      behavior of the PNiPAM microgels is fully retained in the composite material. 
      Volume and structure criteria of the embedded microgel particles are compared to 
      those of the free microgels in acrylamide solution. To visualize the temperature 
      responsive behavior of larger PNiPAM particles, confocal fluorescence microscopy 
      images of PNiPAM beads, of 40-microm size, were taken at two different 
      temperatures. The micrographs also demonstrate the retained temperature 
      sensitivity of the embedded microgels.
FAU - Musch, Judith
AU  - Musch J
AD  - Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52074 
      Aachen, Germany.
FAU - Schneider, Stefanie
AU  - Schneider S
FAU - Lindner, Peter
AU  - Lindner P
FAU - Richtering, Walter
AU  - Richtering W
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20080430
PL  - United States
TA  - J Phys Chem B
JT  - The journal of physical chemistry. B
JID - 101157530
RN  - 0 (Acrylamides)
RN  - 0 (Acrylic Resins)
RN  - 0 (Polymers)
RN  - 25189-55-3 (poly-N-isopropylacrylamide)
RN  - 25852-47-5 (Hydrogel, Polyethylene Glycol Dimethacrylate)
SB  - IM
MH  - Acrylamides/*chemistry
MH  - Acrylic Resins
MH  - *Hydrogel, Polyethylene Glycol Dimethacrylate
MH  - Microscopy, Confocal
MH  - Polymers/*chemistry
MH  - Spectrophotometry, Ultraviolet
MH  - Temperature
EDAT- 2008/05/01 09:00
MHDA- 2008/08/06 09:00
CRDT- 2008/05/01 09:00
PHST- 2008/05/01 09:00 [pubmed]
PHST- 2008/08/06 09:00 [medline]
PHST- 2008/05/01 09:00 [entrez]
AID - 10.1021/jp711939v [doi]
PST - ppublish
SO  - J Phys Chem B. 2008 May 22;112(20):6309-14. doi: 10.1021/jp711939v. Epub 2008 Apr 
      30.