scholarly journals Partitioning of reactive yellow 86 between aqueous and micellar media studied by differential absorption spectroscopy

2017 ◽  
Vol 95 (6) ◽  
pp. 697-703 ◽  
Author(s):  
Naveed ul Haq ◽  
Muhammad Usman ◽  
Ajaz Hussain ◽  
Zahoor Hussain Farooqi ◽  
Muhammad Saeed ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Sodium Dodecyl ◽  
Reactive Dye ◽  
Systematic Investigation ◽  
Ammonium Bromide ◽  
Micellar Media ◽  
Differential Absorption ◽  
Absorption Data ◽  
Sds Micelles ◽  
Cetyltrimethyl Ammonium

The present study describes the partitioning of a reactive dye, reactive yellow 86, between aqueous and micellar media of a cationic surfactant (cetyltrimethyl ammonium bromide, CTAB), as well as an anionic surfactant (sodium dodecyl sulphate, SDS). In a systematic investigation, we have recorded the UV–vis absorption spectra of the dye as a function of surfactant’s concentration above and below the critical micelle concentration (CMC). Absorption spectra display a red shift in the case of CTAB and a hypochromic shift upon using SDS. The partition coefficient (Kx) was calculated using differential absorption data, and the value of free energy of partition (ΔGp) was calculated using this Kx value. The results revealed that the dye is solubilized in CTAB micelles to a greater extent than in SDS micelles.

Modification of Ultraviolet Spectrophotometry Representational Method in Graphene Nanoplates Dispersion

2020 ◽  
Vol 20 (7) ◽  
pp. 4015-4022
Author(s):  
Baomin Wang ◽  
Shuang Deng ◽  
Lu Zhao
Keyword(s):  
Carbon Nanomaterials ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Dimensional Structure ◽  
Ammonium Bromide ◽  
Uv Spectrophotometry ◽  
Characteristic Wavelength ◽  
Chaotic Distribution ◽  
Cetyltrimethyl Ammonium ◽  
Graphene Nanoplates

Graphene nanoplates (GNPs) are carbon nanomaterials with two-dimensional structure which is easy to reunite and their dispersion is necessary before using. The existing methods for dispersion characterization mainly include UV spectrophotometry, scanning electron microscope (SEM), transmission electron microscopy (TEM) and Atomic Force Microscopy (AFM). In this research study, sodium dodecyl benzene sulfonate (SDBS), polyoxyethylene (40) nonylphenyl ether, branched (CO890), polyvinyl pyrrolidone (PVP) and cetyltrimethyl ammonium bromide (CTAB) were used as dispersants, and ultrasonic treatment was employed as dispersion method. Ultraviolet spectrum for GNPs showed that some errors were attained, resulting from dispersant at 274 nm characteristic wavelength of GNPs dispersions with deionized water as controlled sample. The errors could be eliminated if dispersant solution was used as controlled sample. The microstructures of dispersed GNPs observed by SEM, TEM and AFM suggested that the GNPs were dispersed uniformly with 2.5 g/L SDBS, which showed the best dispersion effect. Raman spectrum indicated that more chaotic distribution and edge structures were achieved after dispersion.

The Mechanical Properties of the Cell Surface

1956 ◽  
Vol 33 (3) ◽  
pp. 524-532
Author(s):  
J. M. MITCHISON
Keyword(s):  
Mechanical Properties ◽  
Calcium Ions ◽  
Sodium Dodecyl ◽  
The Other ◽  
Ammonium Bromide ◽  
Zinc Ions ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Respiratory Inhibitors ◽  
Membrane Rigidity ◽  
Cetyltrimethyl Ammonium

Measurements were made with the cell elastimeter on the effect of a number of reagents and of changes in pH on the rigidity of the cell membrane of unfertilized sea-urchin eggs. The membrane rigidity was increased by dithiopropanol, thioglycollate, chloracetophenone, a polyethanoxide and zinc ions. It was lowered by trypsin, cetyltrimethyl ammonium bromide and sodium dodecyl sulphate. Most of the other reagents, including respiratory inhibitors and calcium ions, had no effect. The membrane has a minimum rigidity at a pH of about 5.7.

Surfactant Assisted Hydrothermal Synthesis of Nano-Microsphere Titania

2014 ◽  
Vol 722 ◽  
pp. 38-41 ◽  
Author(s):  
Yun Fei Zhuang ◽  
Ya Lan Bian ◽  
Lin Jing Zhang
Keyword(s):  
Sodium Dodecyl ◽  
Rutile Phase ◽  
Ammonium Bromide ◽  
Titanium Oxides ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
X Ray ◽  
Titanium Trichloride ◽  
Cetyltrimethyl Ammonium ◽  
Surfactant Assisted

Using titanium trichloride (TiCl3) as the precursor, cetyltrimethyl ammonium bromide (CTAB), polyvinyl pyrrolidone (PVP), sodium dodecyl sulfate (SDS) as the surfactants, sodium chloride (NaCl) as the mineralizer, titanium oxides (TiO2) nanomicrospheres were synthesized at 170 °C for 24 h via hydrothermal method. Use x-ray diffraction (XRD) and scanning electron microscopy (SEM) to characterize the crystal structure and morphology of the microspheres. The results show that pure rutile phase TiO2 microspheres can be prepared with the assist of surfactant by hydrothermal treatment. The spheres were composed of radial aligned nanorods. The diameters of the rods were about 40 nm and the lengths were about 500 nm. The diameters of the TiO2 microspheres prepared using CTAB, PVP, SDS as the surfactant were among 1μm~2μm, 5μm~10μm, and 2μm~5μm, respectively.

scholarly journals Incorporation of Ag Nanoparticles Into Micelles. Stability Studies of Self-Organized Nanoparticlesmicelles Structures

2016 ◽  
Vol 39 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Przemysław Siejak ◽  
Krzysztof Polewski
Keyword(s):  
Ag Nanoparticles ◽  
Biological Membrane ◽  
Sodium Dodecyl ◽  
Ammonium Bromide ◽  
Physical Parameters ◽  
Aqueous Environment ◽  
Self Organized ◽  
Sds Micelles ◽  
Triton X ◽  
Kinetics Of

Abstract In this paper we present the results of measured physical parameters of self-organized structures consisting of hydrophobic functionalized silver nanoparticles and amphiphilic molecules capable of micelles formation. Those systems may be considered as simple models for transfer of nanoparticles through the biological membrane. Three different surfactants were used: negatively charged sodium dodecyl sulphite, SDS, neutral Triton X-100 and positively charged tetredodecyltrimethyl ammonium bromide, TTABr. We have found that hydrophobic functionalized Ag nanoparticles are encapsulated in neutral Triton X-100 micelles with a diameter of 10 nm without significant change in the size of the micelles. The efficiency of encapsulation of Ag by SDS micelles is lower compared to Triron X-100 and no incorporation of Ag nanoparticles into TTABr occurs. Obtained results indicate that in aqueous environment ionic properties of molecules creating micelles and concentration ratios between components determine the efficiency and kinetics of two competitive processes association or aggregation of nanoparticles and encapsulation of Ag nanoparticles within micelles.

Spectroscopic Effects of Organized Media on a Cyanine Dye/Phenanthrene Derivative

1992 ◽  
Vol 46 (11) ◽  
pp. 1724-1728 ◽  
Author(s):  
Michael D. Green ◽  
Gabor Patonay ◽  
Thilivhali Ndou ◽  
Isiah M. Warner
Keyword(s):  
Sodium Dodecyl ◽  
Cyanine Dye ◽  
Ammonium Bromide ◽  
Dimerization Constant ◽  
Cyclodextrin Complex ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Fluorescence Characteristics ◽  
Organized Media ◽  
Cetyltrimethyl Ammonium ◽  
Apparent Association

Absorbance and fluorescence characteristics of a cyanine dye/phenanthrene derivative are studied in the presence of β- and γ-cyclodextrin, Brij 35, cetyltrimethyl ammonium bromide (CTAB), and sodium dodecyl sulfate (SDS). The apparent association constant for the dye cyclodextrin complex is estimated with the use of Benesi-Hildebrand equations. Absorbance measurements are used to estimate the dimerization constant of the dye in aqueous solution.

scholarly journals Thermodynamic and Spectroscopic Investigation of Interactions between Reactive Red 223 and Reactive Orange 122 Anionic Dyes and Cetyltrimethyl Ammonium Bromide (CTAB) Cationic Surfactant in Aqueous Solution

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Muhammad Irfan ◽  
Muhammad Usman ◽  
Asim Mansha ◽  
Nasir Rasool ◽  
Muhammad Ibrahim ◽  
...  
Keyword(s):  
Cationic Surfactant ◽  
Systematic Investigation ◽  
Strong Interactions ◽  
Ammonium Bromide ◽  
Thermodynamic Quantities ◽  
Anionic Dyes ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Cetyltrimethyl Ammonium ◽  
Reactive Orange ◽  
High Degree

The present study describes the conductometric and spectroscopic study of the interaction of reactive anionic dyes, namely, reactive red 223 and reactive orange 122 with the cationic surfactant cetyltrimethyl ammonium bromide (CTAB). In a systematic investigation, the electrical conductivity data was used to calculate various thermodynamic parameters such as free energy(ΔG), enthalpy(ΔH), and the entropy(ΔS)of solubilization. The trend of change in these thermodynamic quantities indicates toward the entropy driven solubilization process. Moreover, the results from spectroscopic data reveal high degree of solubilization, with strong interactions observed in the cases of both dyes and the CTAB. The spontaneous nature of solubilization and binding was evident from the observed negative values of free energies (ΔGpandΔGb).

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