PMID- 24164466
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20150330
LR  - 20201001
IS  - 1530-6992 (Electronic)
IS  - 1530-6984 (Linking)
VI  - 13
IP  - 11
DP  - 2013 Nov 13
TI  - Thermally reversible aggregation of Gold nanoparticles in polymer nanocomposites 
      through hydrogen bonding.
PG  - 5297-302
LID - 10.1021/nl402813q [doi]
AB  - The ability to tune the state of dispersion or aggregation of nanoparticles 
      within polymer-based nanocomposites, through variations in the chemical and 
      physical interactions with the polymer matrix, is desirable for the design of 
      materials with switchable properties. In this study, we introduce a simple and 
      effective means of reversibly controlling the association state of nanoparticles 
      based on the thermal sensitivity of hydrogen bonds between the nanoparticle 
      ligands and the matrix. Strong hydrogen bonding interactions provide excellent 
      dispersion of gold nanoparticles functionalized with 
      poly(styrene-r-2-vinylpyridine) [P(S-r-2VP)] ligands in a poly(styrene-r-4-vinyl 
      phenol) [P(S-r-4VPh)] matrix. However, annealing at higher temperatures 
      diminishes the strength of these hydrogen bonds, driving the nanoparticles to 
      aggregate. This behavior is largely reversible upon annealing at reduced 
      temperature with redispersion occurring on a time-scale of ~30 min for samples 
      annealed 50  degrees C above the glass transition temperature of the matrix. Using 
      ultraviolet-visible absorption spectroscopy (UV-vis) and transmission electron 
      microscopy (TEM), we have established the reversibility of aggregation and 
      redispersion through multiple cycles of heating and cooling.
FAU - Heo, Kyuyoung
AU  - Heo K
AD  - Department of Polymer Science and Engineering, University of Massachusetts , 
      Amherst, Massachusetts 01003, United States.
FAU - Miesch, Caroline
AU  - Miesch C
FAU - Emrick, Todd
AU  - Emrick T
FAU - Hayward, Ryan C
AU  - Hayward RC
LA  - eng
PT  - Journal Article
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20131028
PL  - United States
TA  - Nano Lett
JT  - Nano letters
JID - 101088070
EDAT- 2013/10/30 06:00
MHDA- 2013/10/30 06:01
CRDT- 2013/10/30 06:00
PHST- 2013/10/30 06:00 [entrez]
PHST- 2013/10/30 06:00 [pubmed]
PHST- 2013/10/30 06:01 [medline]
AID - 10.1021/nl402813q [doi]
PST - ppublish
SO  - Nano Lett. 2013 Nov 13;13(11):5297-302. doi: 10.1021/nl402813q. Epub 2013 Oct 28.