Effects of Polypropylene Glycol at Very Low Concentrations on Rheological Properties at the Air–Water Interface and Foam Stability of Sodium Bis(2-ethylhexyl)sulfosuccinate Aqueous Solutions

Langmuir ◽  
2020 ◽  
Vol 36 (34) ◽  
pp. 10043-10050
Author(s):  
Keita Aono ◽  
Furitsu Suzuki ◽  
Yoshihiro Yomogida ◽  
Motomitsu Hasumi ◽  
Shinpei Kado ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Foam Stability ◽  
Polypropylene Glycol ◽  
Water Interface ◽  
Low Concentrations ◽  
Air Water Interface

scholarly journals The interfacial structure and Young's modulus of peptide films having switchable mechanical properties

2007 ◽  
Vol 5 (18) ◽  
pp. 47-54 ◽  
Author(s):  
A.P.J Middelberg ◽  
L He ◽  
A.F Dexter ◽  
H.-H Shen ◽  
S.A Holt ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Self Assembly ◽  
Molecular Design ◽  
Foam Stability ◽  
Young's Modulus ◽  
Interfacial Structure ◽  
Water Interface ◽  
Air Water Interface ◽  
Peptide Dissociation

We report the structure and Young's modulus of switchable films formed by peptide self-assembly at the air–water interface. Peptide surfactant AM1 forms an interfacial film that can be switched, reversibly, from a high- to low-elasticity state, with rapid loss of emulsion and foam stability. Using neutron reflectometry, we find that the AM1 film comprises a thin (approx. 15 Å) layer of ordered peptide in both states, confirming that it is possible to drastically alter the mechanical properties of an interfacial ensemble without significantly altering its concentration or macromolecular organization. We also report the first experimentally determined Young's modulus of a peptide film self-assembled at the air–water interface ( E =80 MPa for AM1, switching to E <20 MPa). These findings suggest a fundamental link between E and the macroscopic stability of peptide-containing foam. Finally, we report studies of a designed peptide surfactant, Lac21E, which we find forms a stronger switchable film than AM1 ( E =335 MPa switching to E <4 MPa). In contrast to AM1, Lac21E switching is caused by peptide dissociation from the interface (i.e. by self-disassembly). This research confirms that small changes in molecular design can lead to similar macroscopic behaviour via surprisingly different mechanisms.

Rheological Properties of Lipopolymer−Phospholipid Mixtures at the Air−Water Interface:  A Novel Form of Two-Dimensional Physical Gelation

2001 ◽  
Vol 34 (9) ◽  
pp. 3024-3032 ◽  
Author(s):  
C. A. Naumann ◽  
C. F. Brooks ◽  
W. Wiyatno ◽  
W. Knoll ◽  
G. G. Fuller ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Water Interface ◽  
Two Dimensional ◽  
Air Water Interface ◽  
Physical Gelation

Shear and dilatational rheological properties of vegetable proteins at the air/water interface

2021 ◽  
pp. 107472
Author(s):  
Olga Mileti ◽  
Noemi Baldino ◽  
Jose Antonio Carmona ◽  
Francesca Romana Lupi ◽  
Jose Muñoz ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Water Interface ◽  
Vegetable Proteins ◽  
Air Water Interface

Surface rheological properties of hydroxypropyl cellulose at air–water interface

2007 ◽  
Vol 21 (5-6) ◽  
pp. 776-781 ◽  
Author(s):  
S MEZDOUR ◽  
G CUVELIER ◽  
M CASH ◽  
C MICHON
Keyword(s):  
Rheological Properties ◽  
Hydroxypropyl Cellulose ◽  
Water Interface ◽  
Air Water Interface
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