PMID- 20020723
OWN - NLM
STAT- MEDLINE
DCOM- 20100701
LR  - 20141120
IS  - 1520-5827 (Electronic)
IS  - 0743-7463 (Linking)
VI  - 26
IP  - 8
DP  - 2010 Apr 20
TI  - Pickering emulsions stabilized by a lipophilic surfactant and hydrophilic 
      platelike particles.
PG  - 5397-404
LID - 10.1021/la903817b [doi]
AB  - Liquid paraffin-water emulsions were prepared by homogenizing oil phases 
      containing sorbitan oleate (Span 80) and aqueous phases containing layered double 
      hydroxide (LDH) particles or Laponite particles. While water-in-oil (w/o) 
      emulsions are obtained by combining LDH with Span 80, the emulsions stabilized by 
      Laponite-Span 80 are always o/w types regardless of the Span 80 concentration. 
      Laser-induced fluorescent confocal micrographs indicate that particles are 
      absorbed on the emulsion surfaces, suggesting all the emulsions are stabilized by 
      the particles. The difference of the particle-stabilized emulsion type may be 
      explained by comparing particle contact angles and the oil-water interfacial 
      tensions, indicating that more Span 80 molecules are adsorbed on the LDH 
      particles than on Laponite. Apparently, the LDH particles are rendered more 
      hydrophobic by Span 80, resulting in the formation of w/o emulsions. The 
      long-term stability of the emulsions was also compared. Emulsions stabilized by 
      Span 80 alone completely separate into two bulk phases of oil and water after 3 
      months. However, emulsion stability is greatly enhanced with the addition of LDH 
      or Laponite particles. This synergism was accounted for by an increase of the 
      dilational viscoelasticity modulus of the oil-water interface after particles 
      were added to the aqueous phase. This increase indicates that the gel-like 
      particle layer stays at the oil-water interface and resists emulsion coalescence. 
      Scanning electron microscope (SEM) images display the presence of a firm layer 
      surrounding the emulsion droplets and a three-dimensional particle network which 
      extends into the bulk phase aiding emulsion stability.
FAU - Wang, Jun
AU  - Wang J
AD  - Key Laboratory for Colloid and Interface Chemistry of the Education Ministry, 
      Shandong University, Jinan, Shandong 250100, PR China.
FAU - Yang, Fei
AU  - Yang F
FAU - Tan, Junjun
AU  - Tan J
FAU - Liu, Guopeng
AU  - Liu G
FAU - Xu, Jian
AU  - Xu J
FAU - Sun, Dejun
AU  - Sun D
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
RN  - 0 (Emulsions)
RN  - 0 (Hexoses)
RN  - 0 (Silicates)
RN  - 0 (Surface-Active Agents)
RN  - 059QF0KO0R (Water)
RN  - 06XEA2VD56 (sorbitan monooleate)
RN  - D703131383 (laponite)
SB  - IM
MH  - Emulsions/*chemistry
MH  - Hexoses/*chemistry
MH  - Hydrophobic and Hydrophilic Interactions
MH  - Microscopy, Confocal
MH  - Microscopy, Electron, Scanning
MH  - Molecular Structure
MH  - Silicates/*chemistry
MH  - Surface-Active Agents/chemistry
MH  - Water/*chemistry
EDAT- 2009/12/22 06:00
MHDA- 2010/07/02 06:00
CRDT- 2009/12/22 06:00
PHST- 2009/12/22 06:00 [entrez]
PHST- 2009/12/22 06:00 [pubmed]
PHST- 2010/07/02 06:00 [medline]
AID - 10.1021/la903817b [doi]
PST - ppublish
SO  - Langmuir. 2010 Apr 20;26(8):5397-404. doi: 10.1021/la903817b.