PMID- 15875836
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20060803
LR  - 20191026
IS  - 0743-7463 (Print)
IS  - 0743-7463 (Linking)
VI  - 20
IP  - 8
DP  - 2004 Apr 13
TI  - Effect of added surfactant on temperature-induced gelation of emulsions.
PG  - 3107-13
AB  - This paper involves an investigation of the effect of added ionic surfactant on 
      the temperature-induced gelation of oil-in-water (O/W) emulsions stabilized by a 
      responsive copolymer. The oil phase used in this study is 1-bromohexadecane. The 
      copolymer is poly(NIPAM-co-PEGMa) (NIPAM and PEGMa are N-isopropylacrylamide and 
      poly(ethylene glycol) methacrylate, respectively). The lower critical solution 
      temperature for the copolymer was 39.5 degrees C. The ionic surfactant used in 
      this work was sodium dodecylbenzenesulfonate (NaDBS). The critical association 
      concentration for NaDBS and poly(NIPAM-co-PEGMa) was measured at 0.30 mM using 
      fluorescence measurements (pyrene was the probe molecule). Gelation temperatures 
      were measured for the O/W emulsions to establish the effect of added NaDBS and 
      copolymer concentration (Cp) on the gelation temperature (Tgel). The strength of 
      the gels was measured using dynamic oscillatory measurements. These measurements 
      allowed the shear modulus of the gel at Tgel to be estimated as 100 Pa. A 
      theoretical model based on transient network theory was developed that predicts 
      the dependence of Tgel on Cp. The study revealed that NaDBS has two effects on 
      the overall cross-link density of the emulsion gels: it contributes a source of 
      cross-linking via micellar cross-links and also decreases the proportion of 
      transient cross-links due to electrostatic repulsion.
FAU - Alava, Cristina
AU  - Alava C
AD  - Manchester Materials Science Centre, UMIST and the University of Manchester, 
      Manchester M1 7HS, UK.
FAU - Saunders, Brian R
AU  - Saunders BR
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
EDAT- 2005/05/07 09:00
MHDA- 2005/05/07 09:01
CRDT- 2005/05/07 09:00
PHST- 2005/05/07 09:00 [pubmed]
PHST- 2005/05/07 09:01 [medline]
PHST- 2005/05/07 09:00 [entrez]
AID - 10.1021/la036371l [doi]
PST - ppublish
SO  - Langmuir. 2004 Apr 13;20(8):3107-13. doi: 10.1021/la036371l.