توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱the cationic conventional surfactants effect on the properties of monolayer and micellar phases in cationic gemini surfactants aqueous solution
نویسنده(ها): ، ،
اطلاعات انتشار: دومین همایش علوم و فناوری مواد فعال سطحی و صنایع شوینده، سال
تعداد صفحات: ۶
the adsorption behavior at the liquid –air interface and aggregation characteristics were investigated in gemini surfactants in aqueous media containing different concentrations of conventional ionic surfactants by surface tension and conductometry measurements. also the effects of cationic conventional surfactants CCS were studied on the size and phase transition in these systems . the free energy of the mixed micellization DGmic was obtained from the critical micelle concentration CMC and degree of counter ion dissociation a values. the differences in the free energies of micellization of gemini surfactants between pure state and gemini –CCS mixtures were calculated to monitor the influence of CCS on the micellization process.<\div>

۲THE investigation of nanostructures and microstructures properties in surfactants catanionic mixture in mixed solvents containing dilute electrolyte solutions
نویسنده(ها): ، ،
اطلاعات انتشار: دومین همایش علوم و فناوری مواد فعال سطحی و صنایع شوینده، سال
تعداد صفحات: ۷
Our investigation show that the attrative interaction in the mixed micelle is lower that in the mixed monolayer at the air\water interface. Also transition from nanostructures mixed micelles to microstructures vesicles and vice versa is determined by conductometry method . in present work the adsorption behavior at the liquid –air interface and aggregation characteristics are investigated in binary ionic \ ionic surfactant mixtures cetyltrimethylammonium bromide CTAB and sodium dodecyl sulfate SDS and ethylene glycol as co–solvent at different concentrations of NaBr by surface tension and conductometry measurements . minimum surface tension at cmc gcmc,maximum surface excess concentration Gmax,the minimum area per molecule at the aqueous solution\ air interface Amin , and the effectiveness of surface tension reduction Pcmc are determined in the various percentages of EG in the constant electrolye concentration.<\div>

۳Surfactant–Carbon Nanotube Self–Assembly in Aqueous Solution
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش علوم و فناوری مواد فعال سطحی و صنایع شوینده، سال
تعداد صفحات: ۶
The discovery of carbon nanotubes offeers exciting opportunities for the development of novel high property materials. However, disaggregation and formation of the Uniform suspensions are critical challenges that must be met to successfully produce such high property materials, since carbon nanotubes tend to self–associate into micro–scale aggregates. Recent advances indicate that ultrasonicating carbon nanotube dispersions stabilized by surfactants is an effective way to produce uniform suspensions. For further perfecting this procedure it is essential to know how surfactants adsorb on nanotube surfaces. Here we report an atomic–level molecular dynamics (MD)simulation for the self–assembly of Dodecyltrimethylammonium bromide (DTAB) surfactant on single–walled carbon nanotube (SWNT) surfaces at room conditions. We make an effort to clarify the role of the surfactant concentration on the morphology of aggregate formed.<\div>

۴The effect of surfactant structure on the dispersion of MWCNT
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش علوم و فناوری مواد فعال سطحی و صنایع شوینده، سال
تعداد صفحات: ۴
The discovery of carbon nanotubes In water is a challenging task for their unique applications. Dispersion of multi walled carbon nanotubes (NWCNT) have been tested with different surfactants. Herein, we investigated a novel method to prepare highly dispersed MWCNTs using the mixtures of cationic surfactant CTAB and anionic surfactant SDS. Stable dispersion were obtained at low total surfactant concentration as compares to their concentration where used alone and also e investigated that rich cationic mixtures disperse MWNTS better than anionic mixtures.<\div>

۵The investigation of adsorpation SDS, SDBS, DTAB, CTAB and Triton X–100 monomers on multiwall carbon nanotrbe
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش علوم و فناوری مواد فعال سطحی و صنایع شوینده، سال
تعداد صفحات: ۴
In this work pure surfactant And mixture of 0.01 wt% and 0.02 wt% NWCNT with SDS, CTAB, DTAB, SDBS, Triton X–100 surfactant were prepared and the conductivity of all solution were measured. The conductivity of surfactant mixture with NWCNT was more than the pure system in the same concentration. In addition the conductivity of solution was depended on the amount of MWCNT.<\div>

۶Effect of deposition time on physical properties of ZnS thin films; prepared at a new condition
نویسنده(ها): ، ،
اطلاعات انتشار: اولین همایش ملی تکنیک های نوین در تجهیزات و مواد آزمایشگاهی صنعت نفت ایران، سال
تعداد صفحات: ۴
High quality ZnS thin films were deposited on glass substrates by a simple chemical solution method using tri sodium citrate as a new as well as nontoxic complexing agent for Zn2+ions. The effect of deposition time on thickness, morphology, compactness, particle size, transmittance values in the visible region and band gap energy of ZnS thin films were studied by scanning electron microscopy (SEM) and ultraviolet–visible (UV–vis) spectroscopy. The thickness of the prepared ZnS films could be controlled from 25 nm to 100 nm by changing deposition time from 2h to 6 hours.<\div>

۷Preparation of nanostructured ZnS thin films on polymeric substrate using an environmetal friendly– CBD method
نویسنده(ها): ، ،
اطلاعات انتشار: اولین همایش ملی تکنیک های نوین در تجهیزات و مواد آزمایشگاهی صنعت نفت ایران، سال
تعداد صفحات: ۴
Dense and uniform nanostructured ZnS thin films were deposited on polystyrene (PS) substrate using an environmetal friendly chemical bath deposition (CBD) method from an aqueoussolution containing nontoxic reagents. The effect of polymeric substrate on the morphology and compactness of the particle as well as optical properties of the ZnS thin films were examined byscanning electron microscopy (SEM) and ultraviolet–visible (UV–vis) spectroscopy. UV–visspectroscopy data revealed the obtained ZnS films to have an optical band gap ranging from 3.4 to3.55 eV for ZnS thin films deposited on polystyrene substrates. These amounts of Eg are larger than Eg of bulk ZnS (Eg= 3.37 eV), showing quantum confinement effects<\div>

۸Investigation on the physical properties of as–deposited and the annealed ZnS thin films for solar cell applications
نویسنده(ها): ، ،
اطلاعات انتشار: سومین همایش ملی تکنولوژی های نوین در شیمی، پتروشیمی و نانو ایران، سال
تعداد صفحات: ۴
Nanostructured ZnS thin films were obtained by an environmental friendly CBD method using the nontoxic materials for 4h deposition time. ZnS thin films were investigated in terms of morphology, particle size and compactness by scanning electron microscopy (SEM). The transmittance of the films in the visible region as well as roughness of the films was studied by the ultraviolet–visible (UV–vis) spectroscopy and the atomic force microscopy (AFM), respectively. The annealing effect in air atmosphere on the morphology, compactness, particle size, band gap energy and transmittance of the ZnS thin films were also investigated.<\div>
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