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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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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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