LOGIN TO YOUR ACCOUNT

Username
Password
Remember Me
Or use your Academic/Social account:

CREATE AN ACCOUNT

Or use your Academic/Social account:

Congratulations!

You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.

Important!

Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message

CREATE AN ACCOUNT

Name:
Username:
Password:
Verify Password:
E-mail:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Mwakibete, HKO
Languages: English
Types: Doctoral thesis
Subjects: QD, other
The effective degree of micellar dissociation of\ud cetyltrimethylammonium bromide (CTAB) micelles has been\ud determined from electrochemical (EMF) measurements using a\ud CTAB selective electrode. Thermodynamic parameters have\ud been determined using the `Ion binding model' and show\ud dominance of hydrophobic interactions in free CTAB\ud micellization. The enthalpy contribution is insignificant.\ud The binding of the surfactant CTAB onto the neutral watersoluble\ud hydrophobic polymers: poly(propylene oxide) (PPO),\ud poly(vinylmethylether) (PVME) and ethyl(hydroxyethyl)\ud cellulose (EHEC) has also been investigated by the EMF\ud technique. In all cases it has been shown that the\ud surfactant binds to the polymer and the bound surfactant\ud exists in the form of small aggregates. The EMF data has\ud been used to investigate the characterization of the\ud binding process.\ud The formation of inclusion complexes between alkylpyridinium\ud bromide (CPyBr) and alkyltrimethylammonium\ud bromide (CIITAB) with a- and ß-cyclodextrins (CDs) have also\ud been investigated by the EMF technique. In addition the\ud thermodynamics of the inclusion on a- and ß-CDs by the\ud surfactants : CTAB, CPyBr, alkylsulfates (COSO3Na) , and\ud alkanesulfonates (CnSO3Na) have been carried out using an\ud Omega isothermal titration calorimeter (ITC). Whereas ß-CD\ud systems form predominantly 1: 1 complexes, a-CD form 1: 1 and a 2: 1 complexes with surfactants having long hydrophobic\ud tails. For both a- and ß-CD the complexation constants\ud increase as the chain length of the surfactant increases,\ud showing that the driving force dominating the formation of\ud these complexes is the hydrophobic effect. The 1: 1 ß-\ud CD/surfactant complexation is accompanied by large increase\ud in entropy. The 1: 1 a-CD/surfactant complexation and all\ud 2: 1 complexation are accompanied by a large increase in\ud enthalpy.
  • No references.
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article