Dissertation > Excellent graduate degree dissertation topics show

Study on the Surfactant in Aqueous Solutions by Ultramicroelectrode Voltammetry

Author: MengJun
Tutor: LuYao
School: Institute of Physical and Chemical Technology
Course: Applied Chemistry
Keywords: Ultamicroelectrode Addition Alkylbenzene Sulfonate Gemini Surfactant Micelle Diffusion Coefficient Micelle Aggregation Number
CLC: O647.2
Type: Master's thesis
Year: 2009
Downloads: 184
Quote: 0
Read: Download Dissertation

Abstract


Surfactants are widely used in various fields and becoming necessary additive in industrial production and people’s daily life due to their unique properties. In recent years, the new generation of surfactant, Gemini surfactant, is becoming the researching hotspot of relative fields. The Gemini surfactant improves the structure of traditional surfactant and performs better property than the traditional surfactant. The research ranges from its structure design, composition and analysis to interface activity, quality of the congeries, cooperating effect and application, etc. Therefore, it’s importance to develop new researching methods to study the performance, functioning rule and principle of the surfactants.Based on the existing researches, this work enlarges the application of the ultamicroelectrode voltammetry in the surfactant system, mainly its application in research of the quality of traditional surfactants and Gemini surfactant. The ultamicroelectrode voltammetry is used to measure the diffusion coefficient change of micelle, the effect of the additives on the quality of the surfactant solution is specially studied. The study includes interface tension, micelle shape, size, diffuse and interaction, relative rules and mechanism are discussed, and a deeper comprehension of the microcosmic structure change of the congeries and some important property is realized.The main contents and the results are as follows:1. The effects of catechol on the change of cetyltrimethylammonium bromide (CTAB) micelles in aqueous solutions have been studied by Ultramicroelectrode (UME) cyclic voltammetry and Time-Resolved Fluorescence Quenching (TRFQ). It has been shown that the diffusion coefficient decreases and the micelle aggregation number increases with the addition of catechol. In order to analyze the change of the micelles, other micelle parameters like the effective radius (a), surface area of micelle (S), area of single CTAB molecule (A) and packing parameter (P) were calculated. All the results show that catechol can accelerate the increase of the aggregate size and sphere-to-rod morphology change of CTAB micelles even with lower concentration of CTAB.2. The effects of NaCl on the properties of alkylbenzene sulfonate Gemini surfactant have been investigated by spinning drop method and Ultramicroelectrode (UME) cyclic voltammetry. Spinning drop method and UME are used to measure the interfacial tension between Gemini Ia aqueous solution and heptane, the diffusion coefficient of Ia in aqueous solutions. It has been shown that the interfacial tension decreases and the diffusion coefficient increases with the addition of Nacl. This is because that electrostatic force reduces the electrostatic repulsion forces between ionic groups of Ia, which leads to a tighter arrangement of Ia and then reduces the interfacial tension and diminishes the size of micelles; micelles surface charge has been neutralized, so the electrostatic repulsion force between micelles decreases and the mobility of the micelles increases, which shows a larger diffusion coefficient.

Related Dissertations

  1. Identification of Cyto-and Molecular Genetics of Multisomic Addition Line "Nj08-063" in Brassica Napus and Its Agronomical Traits,S565.4
  2. Allocation and Molecular Markers of a Powdery Mildew Resistance Locus to the Chromosome 6R of Secale Cereale L. CV. ’Jingzhouheimai’,S512.1
  3. Ozone pre-oxidation and coagulation combined process of removal of arsenic in drinking water,R123.1
  4. L- proline derivative chiral catalytic acyclic nucleoside and nucleotide compounds asymmetric synthesis,O621.34
  5. Asymmetric Synthesis of α-fluoromethylated α-propargylamines Induced by (S)-tert-butanesulfinamide,O621.34
  6. Membrane chemical reactor to remove As (Ⅲ) and ultra- filtered water membrane treatment pilot study,TU991.2
  7. Studies on Copper-catalyzed Reactions Between Arylboronic Acids and Alddhydes,O621.25
  8. The Research of Settlement Law of Soft Ground Treated with Surcharge Preloading,U416.1
  9. Enhancing L-Phe Production by E. coli WSH-Z06 (pAP-B03) Through Reduction of Acetic Acid Accumulation,TQ922
  10. Synthesis and Fluorescence Behavior of a Thermoresponsive Polymer Ended with Fluorescent Group,O631.3
  11. Synthesis of N-heterocyclic Carbene (NHC)-metal Complexes Derived from Proline and Their Applications,O643.32
  12. Chiral Bis piperidineamide Synthesis and diethyl zinc and α, β- unsaturated aldehydes and ketones Asymmetric Addition Reactions,O621.25
  13. Strategies on the Fermentation of Candida Utilis for Enhanced Production of Glutathione,TQ925
  14. Designing and Synthesis of Chiral Organocatalysts and Their Applications in Asymmetric Michael Addition Reactions,O643.36
  15. Synthesis and Characterization of Well-defined Soluble Mq_n-Functionalized Polymers via RAFT Polymerization,O631.5
  16. Montessori mathematics learning with the operation of child care capacity development of mathematical subtraction,G613.4
  17. Research of Tetrahydrofolate Coenzyme Model’s Synthesis and Function,Q55
  18. The Clinical Observation of Lowering Recurrence Rate of Vulvovaginal Candidiasis Patient with Spleen Deficiency and Wet Heat Treated with Modified Yi Huang Tang,R271.9
  19. Effect of Bimanual Microincisional Cataract Surgery Versus Conventional Coaxial Small-incision Cataract Surgery on Therapeutic Effect:a Meta-analysis,R779.66
  20. Synthesis and Addition Polymerization of Norbornene Derivative with a Pendent Azobenzene Functional Group,TB34
  21. Genetic Analysis of Resistance to Stripe Rust on Wheat Cultivars N.Strampelli and Three Additional Lines Derived from Wheat and Psathyrostachys Huashanica Keng,S512.1

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > The physical chemistry of surface phenomena > Surfactant chemical
© 2012 www.DissertationTopic.Net  Mobile