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Applications of Urea in the Surfactant Systems

Author: Lou Aihua
Tutor: Guo Rong
School: Yangzhou University
Course: Physical Chemistry
Keywords: Urea molecules Lamellar liquid crystal Cationic surfactant Micellar system Bicontinuous Solubilization effect Surfactant SDS Surfactant system Triton Solubilization
CLC: O647.2
Type: Master's thesis
Year: 2001
Downloads: 19
Quote: 0
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Abstract


1. Urea in the surfactant system in the dimerization of urea molecules to the monomer and dimer forms in aqueous systems coexist. Micellar system of cationic surfactant cetyltrimethylammonium bromide (CTAB) , urea molecule located in the micelle palisade layer makes the CTAB micelle system conducive urea dimerization . The anionic surfactant SDS and the nonionic surface active agent of Triton X - 100 micelles system Dimerization of urea does not have a significant impact , which is related to the interaction between the urea molecules and surfactants . Above conclusions energy calculation results coincide . 2. Urea surfactant CTAB can enhance the role of urea in the CTAB / nC 5 < / sub > H 11 OH / H 2 O system solubilization - solubilization nC 5 H 11 OH in the O / W microemulsion in the solubilization and water in W / O and can simultaneously improve a solubility in water , having a solubilizing effect; solubilization capacity of the microemulsion , O / W and W / O microemulsion region while expanding solubilization - solubilization effect . The positioning of the urea molecule in the lamellar liquid crystal reduces the stability of the lamellar liquid crystal , resulting in a lamellar liquid crystal opposite the microemulsion Bicontinuous conversion as well as isotropic area increases . Urea in CTAB / nC 5 H 11 < / sub> OH / H 2 O system solubilization - solubilization mechanism : O / W W / O microemulsion stability while increasing stability decreases and the conversion of the lamellar liquid crystal microemulsion bicontinuous lamellar liquid crystal . 3. The variability of the α-helix structure of the bovine serum albumin (BSA) in the urea solution and restore circular dichroism (CD) of determination that a small amount of sodium oleate was beneficial urea destruction BSA α - helix structure of the recovery, this result Since oleic acid ion through crosslinking with BSA different rings non-polar group and the electropositive group interactions. However, due to the cationic surfactant CTAB can interact with the anionic surfactant sodium oleate , the non-ionic surface active agent Triton X - 100 and bovine serum albumin (BSA) in a hydrophobic group interaction, so the above system, the surface-active agent CTAB and Triton X-100 added in turn makes the recovery of BSA variation .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > The physical chemistry of surface phenomena > Surfactant chemical
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