The method is applicable to cationic, anionic, and nonionic surfactants, and it offers a facile, in situ, and sensitive means of detecting micelle formation over a broad range of CMC values larger than 10 −1 mM. It is shown, both experimentally and theoretically, that the CTAX bilayer significantly reduces the refractive index (RI) sensitivity of anisotropic gold nanoparticles such as nanocubes and concave nanocubes, nanorods, and nanoprisms. Measurements of CMC for sodium dodecyl sulfate (8.10 mM), cetyltrimethylammonium chloride (1.58 mM), and Triton X-100 (0.21 mM) were in excellent agreement with values previously reported in the literature. Herein, the influence of CTAX on nanoparticle sensitivity to local dielectric environment changes is reported.
The measurement system provides rapid semiautomatic data collection and analysis, increasing the precision, sensitivity, and range of applicability of the technique while substantially decreasing the amount of manual intervention required. On reaching the surfactant’s CMC value, an abrupt change was observed in the rate of increase of the refractive index with increasing concentration.
The refractive index of an aqueous surfactant solution was monitored as the surfactant concentration was increased using an automated dispensing system. Wavelength dependence of RI from theoretical prediction based on empirical equation was examined for various concentration of CdCl 2 system and the results are reported in the paper.We describe a simple and rapid method for determining the critical micelle concentration (CMC) of surfactants from fiber-optic measurements of refractive index. The correlation on index of refraction between empirical data and theoretical prediction were performed using the concept of molar refraction. The effect of micellar properties such as the critical micelle concentration (cmc) and degree of ionization were systematically studied for aqueous SDS system in the presence of CdCl 2. In our study, a maximum RI enhancement was observed from 6.5 M CdCl 2 in 8.2 mM aqueous SDS solution. The polymers described herein may exhibit self-healing properties, a low dielectric constant, and a low refractive index. However the refractive index tends to increase much more strongly as a function of salt concentration. Abstract: Inorganic siloxane ladder polymers with metal-aza/thio crown complexes, and methods of making and using such siloxane ladder polymers are disclosed. substance name alternate name formula refractive index InChI SMILES d-Amyl acetate: C 7 H 14 O 2: 1.3960: Ethylacetylene: C 2 H 5 CCH: 1.3962: Ethylethylene: C 2 H 5 CHCH 2: 1.3962: Isooctane (CH 3) 2 CH(CH 2) 4 CH 3: 1.3964: sec.-Butyl alcohol: C 2 H 5 CH(OH)CH 3: 1.397: Propyl nitrate: C 3 H 7 ONO 2: 1. Although they are widely used, the refractive index detectors suffer from several disadvantages - lack of high sensitivity, lack of suitability for gradient elution, and the need for strict temperature. The refractive index (RI) was found to be increased in the presence of both anionic and cationic surfactants compared to those of water and also increased as a function of surfactant concentration. Refractive indices of organic substances, part 5, temperature 20☌, 589.29 nm. These bulk property detectors are based on the change of refractive index of the eluant from the column with respect to pure mobile phase. The index of refraction (RI) of both cationic and anionic surfactant systems were examined in the presence of wide range of inorganic salts, and parameters such as size of surfactants, concentrations, and temperature were varied. In order to find new immersion liquids to improve the resolution of 193 nm immersion photolithography, we have attempted to discover aqueous system possessing an index of refraction greater than that of water using aqueous surfactant systems.