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Effect of temperature and chain length of added primary amines on the sphere to rod transition of aqueous ionic micelles

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Title Effect of temperature and chain length of added primary amines on the sphere to rod transition of aqueous ionic micelles
 
Creator Sarma, GVS
Prasad, C Durga
Manohar, K
Babu, BK
Ramesh, KV
 
Subject Aqueous ionic micelles
Critical micellar concentration
Micelle
Surfactant
Sphere-to-rod
 
Description 808-812
The importance of micelles as templates for nanomaterials is growing day by day. This resulted in an increasing interest
for micelles in different sizes and shapes. Addition of n-amines to micellar solutions was found to bring change in the shape
of the micelles from sphere to rod in aqueous ionic micellar solutions. The change in shape is qualitatively obtained from
sudden change in the slope of pH versus amine concentration plots because the degree or protonation of n-alkylamines
depends on the shape of micelles. In the present investigation, pH is measured at different temperatures to elucidate the
influence of addition of n-amines on sphere-to-rod transition in aqueous micellar solutions. The surfactants employed in the
present investigation are cetyltrimethyl ammonium bromide (CTAB), cetylpyridinium chloride (CPC), and sodium dodecyl
sulphate (SDS). As the amine concentration is increased, the pH increases linearly at certain amine concentration and the
slope of the resulting straight line changes on further addition of amine. It is noticed that increasing temperature requires
more amine for structural transition of aqueous ionic micelles. It is also observed that the effectiveness of added amines
leading to shape transition from sphere to rod is in the order of C8NH2>C7NH2> C6NH2.
 
Date 2022-08-23T11:22:51Z
2022-08-23T11:22:51Z
2022-08
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/60344
https://doi.org/10.56042/ijbb.v59i8.64424
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJBB Vol.59(8) [AUGUST 2022]