NDLI: Slow dynamics of wormlike micelles

Content Provider	Royal Society of Chemistry (RSC)
Author	Olsson, U. Palazzo, G. Ceglie, A. Börjesson, J. Angelico, R.
Copyright Year	2010
Abstract	We present an extensive rheology study of the wormlike micelle system lecithin-water-cyclohexane. In this system the micelles are really wormlike, meaning that there are no signs of micellar branching, as it has previously been demonstrated by NMR self-diffusion experiments (R. Angelico, U. Olsson, G. Palazzo and A. Ceglie, Phys. Rev. Lett., 1998, 81, 2823). Wormlike micelles break and recombine, processes that are important for the stress relaxation. When branching is highly unfavorable, micelle recombination reactions only involve micelle ends, the concentration of which are very low when the micelles are very long. Hence, the break and recombination kinetics is very slow for true wormlike micelles. In the present system, the stress relaxation times are of the order of an hour. This is about three to four orders of magnitude longer than what commonly is observed in systems claimed to contain wormlike micelles. We conclude that systems with true wormlike micelles are very rare. An exponential stress relaxation is observed except at lower concentrations, where the micellar breaking time appears to exceed the reptation time. Because of the slow dynamics, the linear elastic modulus can be obtained from small rapid shear deformations, for which the system obeys Hooke's law. Larger deformations result in a fracture of the micellar network at a critical strain γ* ∼ ϕ−1, where ϕ is the micelle volume fraction. For γ < γ* we may still obtain fracture, although with a lag time, τ, that decreases with increasing γ, and vanishes when γ = γ. Extrapolating τ* to zero deformation we obtain the estimate ≈250 s at the highest concentration ϕ = 0.29. We interpret this time as the equilibrium micellar breaking time at rest, a quantity not previously measured.
Starting Page	1769
Ending Page	1777
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	6
Issue Number	8
Journal	Soft Matter
DOI	10.1039/b920115g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Palazzo Elastic modulus Rheology Reptation Ceglie Hooke Micelle Angelico Olsson Nuclear magnetic resonance Self-diffusion
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

What can be learnt from the comparison of multiscale brownian dynamics simulations, nuclear magnetic resonance and light scattering experiments on charged micelles?

Flow of wormlike micelles in an expansion-contraction geometry

Shear-banding in surfactant wormlike micelles: elastic instabilities and wall slip

Formation and rheological behavior of wormlike micelles in a catanionic system of fluoroacetic acid and tetradecyldimethylaminoxide

Nuclear Magnetic Resonance Diffusometry of Linear and Branched Wormlike Micelles

Wormlike micelles: where do we stand? Recent developments, linear rheology and scattering techniques

Superposition rheology of shear-banding wormlike micelles

Linear and nonlinear rheology of wormlike micelles

Mesoscopic Tube Model of Fluids Composed of Wormlike Micelles

Slow dynamics of wormlike micelles

Similar Documents

What can be learnt from the comparison of multiscale brownian dynamics simulations, nuclear magnetic resonance and light scattering experiments on charged micelles?

Flow of wormlike micelles in an expansion-contraction geometry

Shear-banding in surfactant wormlike micelles: elastic instabilities and wall slip

Formation and rheological behavior of wormlike micelles in a catanionic system of fluoroacetic acid and tetradecyldimethylaminoxide

Nuclear Magnetic Resonance Diffusometry of Linear and Branched Wormlike Micelles

Wormlike micelles: where do we stand? Recent developments, linear rheology and scattering techniques

Superposition rheology of shear-banding wormlike micelles

Linear and nonlinear rheology of wormlike micelles

Mesoscopic Tube Model of Fluids Composed of Wormlike Micelles

Slow dynamics of wormlike micelles