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The inverse microemulsion conductance Its alumina nano particles

Author: HuangZuoZuo
Tutor: SunHongWei
School: Zhengzhou University
Course: Condensed Matter Physics
Keywords: Reverse Microemulsion Conductivity Microstructure Alumina Preparation
CLC: TB383.1
Type: Master's thesis
Year: 2007
Downloads: 240
Quote: 5
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Abstract


In this paper, CTAB / n-butanol / cyclohexane / Al (of NO 3 ) 3 (NH 3 · H 2 O) Microemulsions in solution four components of nano-water nuclear as a template, using microemulsion method successfully prepared has uniform nanoscale particle size, particle size distribution, and good dispersion of spherical Al 2 O 3 particles. This article includes the the Inverse Microemulsion the choice and Al 2 the O 3 Nanoparticles two parts, using a combination of visual and conductance measurements means CTAB / n-butanol / cyclohexane / water, the microscopic structure of the four-component system of a surface-active agent CTAB, the change in the type of cosurfactant used in an amount of n-hexyl alcohol and the dispersed phase of the system is in the structure of the W / O The aqueous phase solubilization capacity and stability of the system, to find the best ratio of suitable the Preparation Al 2 O 3 nanoparticles inverse microemulsion. Then this ratio under the inverse microemulsion as a template, and successfully synthesized by changing the different reaction conditions, different size of Al 2 O 3 nanoparticles. SEM, TG-DSC and XRD testing methods were used to characterize the resulting powder. Concluded the following: (1) by the CTAB CTAB / n-butanol / cyclohexane / water microemulsion investigated the solubilization of water in the oil-in-water structure, found that the content of the anti-surfactant CTAB phase microemulsion stability has a significant impact. Liu CTAB surfactant in the oil phase of cyclohexane concentration less than 0.6mol / L, with increasing CTAB concentration, not only the oil phase, an increase in the number of reverse micelles, and the increase in the aggregation number of single micelles, and thus Inverse Microemulsion maximum solubilization of water increases the stability enhancement. When the surfactant CTAB concentration is greater than 0.6mol / L, since the micelles formed by the CTAB does not change in the oil phase concentration, therefore substantially no change in the maximum water solubilization of the reverse microemulsion, Furthermore, due to excess CTAB was dissolved in the oil phase, the hydrocarbon chains of CTAB intertwined with each other to result in the decreased stability of the microemulsion. (2) of CTAB / n-butanol / cyclohexane / water microemulsion cosurfactant n-butanol content of a very large impact on the strength of the interfacial film. It was found that the n-butanol in the oil phase of cyclohexane concentration of 3.5mol / L, the larger the interface membrane strength of the microemulsion system, better stability. But the size of the content of n-butanol most water solution of the inverse microemulsion little effect. N-butanol when the density value is greater than or less than 3.5mol / L, the stability of the microemulsion system will reduce. (3) For the CTAB / butanol / cyclohexane / water microemulsion, the aqueous phase was replaced with Al (NO 3 ) 3 solution and NH 3 · H 2 O solution, the maximum solubilization capacity of the system as the electrolyte concentration increases and decreases, and the water is deionized water containing less than the aqueous phase water. This is because the ions are added compression of the diffuse double layer of the polar head group of the surfactant, and decreased stability of the microemulsion system, the solubilization ability of the system to the aqueous solution of reducing. (4) microemulsion in the appropriate proportions, with the increase in the amount of water solubilization, CTAB / n-butanol / cyclohexane / water microemulsion After three micro-structure changes continuously, ie oil-in-water (W / O ), oil and water bicontinuous (BC) and an oil in water (O / W) of three types, and when the micro-emulsion is in the structure of water in oil, its conductivity showed typical diafiltration characterized. (5) according to the the microemulsion system's conductivity curve to determine the structure of the microemulsion is feasible, choose the preparation of Al 2 O 3 nanoparticles reverse microemulsion most best prepared as follows: the oil phase volume of cyclohexane is fixed, the surfactant CTAB concentration of 0.6mol / L, cosurfactant butanol concentration to 3.5 mol / L. (6) In the other reaction conditions were the same as in the case of Al 2 O 3 particle size by adjusting the amount of water in the composition of the microemulsion is controlled. Control. The experimental results show that, to Ω 1 : ω 2 : Ω by 3 = 1:2:3 when Al 2 O 3 the particulate in D (ω1), D (Ω2) (D 2 ), J , α3 diameter were 30nm, 40nm and 80nm, particle diameter with the ω increases significantly increased. However, when too much water, the surface active agent can not achieve good water nuclear coated, deterioration of the strength of the interfacial film, water nuclear easily deform, rupture, the ability to control the particle size of weakened, resulting nano particles obtained in not only the particle diameter increases but poor dispersion. (7) In the other reaction conditions were the same as in the case of Al 2 O 3 particle diameter with the micro-emulsion is solubilized in the aqueous core increase in the concentration of reactants is increased . Experimental results show that, Al (NO 3 ) 3 concentration of the solution were 0.1 mol / L, 0.5 mol / L, and 1mol / L, the corresponding Al 2 O 3 particle size is 25nm, 40nm and 50nm. But when the concentration of reactants is too large, resulting in decreased stability of the microemulsion, and cause the generated nano-particles reduced dispersibility. The Al (8) 2 O 3 nanoparticles prepared in this experiment Al SEM, TG-DSC and XRD analysis shows, with Microemulsion Method 2 O 3 precursor at 1150 ℃ complete conversion of α-Al 2 the O 3 , than the traditional preparation method 1200 ° C above the temperature required to be low. The resulting particle size distribution uniform dispersion.

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