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Amphiphilic molecular assemblies of ionic liquid structure and applied research

Author: DaiTuoSu
Tutor: DingYuanHua；GuoRong
School: Yangzhou University
Course: Physical and chemical
Keywords: Ionic liquids Amphiphilic block copolymers Lamellar liquid crystal Microemulsion Bovine serum albumin
CLC: O631.3
Type: Master's thesis
Year: 2009
Downloads: 145
Quote: 1
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Abstract


Amphiphilic block copolymers micellar aggregation behavior ionic liquid use rheological methods to study the two block copolymers P123 and F127 in the ionic liquid [Bmim] PF6 aggregation behavior, the results show that they are pseudoplastic fluids, over a certain concentration, the two systems will produce the phenomenon of shear thinning, i.e., the block copolymer segment will produce tangles. For the same concentration of F127 / [BMIM] PF6 solution phase of P123 / [Bmim] PF6 solution easier to produce the phenomenon of shear thinning, i.e. the decrease in viscosity occurs at a relatively lower shear rate. At the same time, we found that as the temperature rises, the F127 / [Bmim] PF6 solution under high shear rate shear thinning phenomenon becomes obvious, but P123 / [Bmim] PF6 solution but showed almost the opposite of the trend in the when the temperature is higher than 30 oC, its viscosity shear thinning point with increasing temperature advance, especially when the temperature is higher than 45 oC not only shear thinning phenomenon is becoming increasingly apparent, even viscosity increase sharply; dynamic flow transformation behavior studies show that with the increase of the concentration of the block copolymer, F127 and of P123 / [bmim] PF6 solution, the storage modulus G 'and loss modulus G \elevated F127 / [Bmim] PF6 solution loss modulus G \modulus G 'with increasing temperature decreased and then an upward trend. [Bmim] PF6/Tween 85 / xylene microemulsion structure and nature study non-ionic surfactant Tween 85 ionic liquids [Bmim] PF6 and xylene build new ionic liquid microemulsion system, measured by electrical conductivity of the system O / IL, bicontinuous, and IL / O microemulsion liquid phase diagram, while taking advantage of the infrared, 1H NMR, UV After a series of research methods, dynamic light scattering study of microemulsion droplets formed within the material interaction characteristics results show that, when added in Tween 85 paraxylene reverse micelle solution [Bmim] PF6, ion imidazole ring with the positively charged molecules of the liquid with the surface active agent molecules with the O atom in the negatively charged OE chain binding, thus weakening the original to the Tween 85 in the molecule of an OE chain end-OH and other OE chain or other Tween The role of hydrogen bonds formed by the oxygen atom in the chain molecules 85 OE, UV research results also show that, in the formation of microemulsion droplets, the ionic liquid is well positioned in the surfactant Tween the molecules 85 OE chain also found , when the ionic liquid and the surfactant molar ratio R increases, the interaction enhanced; dynamic light scattering results show that the microemulsion hydrodynamic radius Rh is increased with increasing the R value of 3. Tween 85 / [ bmim] PF6/H2O Lamellar liquid crystal and lamellar liquid crystal / Ag nanoparticle composite structure of the system and lubricating properties to the ionic liquid [Bmim] PF6, non-ionic surfactant Tween 85 and water together to build the lamellar liquid crystal in the layer Preparation of Ag nanoparticles in the liquid crystal is small amplitude oscillation frequency scan / Nanoparticle Composites viscoelasticity of the lamellar liquid crystal and lamellar liquid crystal, examine the performance of the above system lubrication and wear testing machine with a high-speed ring block results show: Ag nanoparticles prepared in the lamellar liquid crystal is less than 10 nm in diameter, a more uniform distribution of the lamellar liquid crystal structure strength, shear resistance and lubricating properties are enhanced by the increase of the surfactant content, with increasing water content weakened; while [Bmim] PF6 increasing the content also makes the system structural strength, shear resistance weakened, but due to the ionic liquid itself has good lubricating properties, and the lubricating properties of the system is enhanced with the increase in the liquid content of the ion addition, the layer introduction of nanoparticles in a liquid crystal is able to make a better anti-wear and friction reducing interaction of ionic liquids with bovine serum albumin (BSA) by UV - visible spectroscopy, fluorescence spectroscopy, synchronous fluorescence spectra of negatively stained - transmission electron microscopy (TEM), circular dichroism, and other experimental methods of isothermal titration calorimetry (ITC) to investigate the interaction of ionic liquids with bovine serum albumin was found [Bmim] Cl adding BSA UV absorption intensity, but also cause fluorescence quenching, synchronous fluorescence results [Bmim] Cl molecules with the area close to the tryptophan residues in the protein interaction, protein conformation and internal hydrophobic structure changed; negative staining - transmission electron microscopy. visually shows the addition of ionic liquid protein structure changes; BSA α-helix, β-sheet ionic liquid ionic liquid with BSA association process produces a strong impact, causing the protein secondary structure The change; ITC with the surface tension method reveal the interaction between the two.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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