Cetyl-pyridinium chloride

A surfactant solution is a mixture of DTAC (dodecyltrimethylammonium chloride) and CPC (cetyl pyridinium chloride) the respective CMCs of the pure surfactants are 2 X lO M and 9 x IO M (Ref. 140). Make a plot of the CMC for mixtures of these surfactants versus the mole fraction of DTAC. 

An example of the first type is the emulsion stabiliser as exemplified by sodium oleyl sulphate, cetyl pyridinium chloride and poly(ethylene oxide) derivatives. For a number of applications it is desirable that the latex be thickened before use, in which case thickening agents such as water-soluble cellulose ethers or certain alginates or methacrylates may be employed. Antifoams such as silicone oils are occasionally required. 

A buffer is used with a pH of 8.6 and then titrated with a solution of cetyl-pyridinium chloride (CPC). 

The less important positive CCAs are metal-free cationic molecules, such as the black dye nigrosine and the colorless quaternary compound cetyl pyridinium chloride.35,36... 

Tungsten-based catalysts including POMs show high efficiency of H202 utilization [17,18,78-100]. Ishii and coworkers [18] have reported effective H202-based epoxidation of alkenes catalyzed by H3PW12O40 combined with cetyl pyridinium chloride (CPC) as a phase-transfer agent ... 

Figure 2. Adsorption isotherms of cetyl-pyridinium chloride on Ti02 (1 -r2) and Si02...

A nonpolar solubilizate such as hexane penetrates deeply into such a micelle, and is held in the nonpolar interior hydrocarbon environment, while a solubilizate such as an alcohol, which has both polar and nonpolar ends, usually penetrates less, with its polar end at or near the polar surface of the micelle. The vapor pressure of hexane in aqueous solution is diminished by the presence of sodium oleate m a manner analogous to that cited above for systems in nonpolar solvents. A 5% aqueous solution of potassium oleate dissolves more than twice the volume of propylene at a given pressure than does pure water. Dnnethylaminoazobenzene, a water-insoluble dye, is solubilized to the extent of 125 mg per liter by a 0.05 M aqueous solution of potassium myristate. Bile salts solubilize fatty acids, and this fact is considered important physiologically. Cetyl pyridinium chloride, a cationic salt, is also a solubilizing agent, and 100 ml of its A/10 solution solubilizes about 1 g of methyl ethyl-butyl either m aqueous solution. 

The effect of various surfactants, the cationics-eetyl trimethyl ammonium bromide (CTAB), and cetyl pyridinium chloride (CPC), the anionic-sodium lauryl sulfate (SLS), and the nonionic-polysorbate 80 (Tween 80), on the solubility and ionization constants of some sparingly soluble weak acids of pharmaceutical interest was studied (Gerakis et al., 1993). Benzoic acid (and its 3-methyl-, 3-nitro-, and 4-tert-butyl-derivatives), acetylsalicylic acid, naproxen, and iopanoic acid were chosen as model drugs. The cationics, CTAB and CPC, were found to considerably increase th< ionization constant of the weak acidS Ka ranged from-0.21 to-3.57), while the anionic, SLS, showed a negligible effect and the nonionic, Tween 80, generally decreased the ionization constants Solubility of the acids increased in aqueous micellar and in acidiLed micellar solutions. 

CMCs of these polyfluorinated surfactants are of the order of 10 5 m.47 Plots of the observed H chemical shifts versus surfactant concentration of cetyl trimethyl ammonium chloride, cetyl pyridinium chloride, cetyl dimethyl phenyl ammonium chloride, cetyl dimethyl benzyl ammonium chloride, cetyl dimethy 1-2-phenyl ethyl ammonium chloride, and cetyl dimethyl-3-phenyl propyl ammonium chloride, are sigmoidal and were fitted to a model based on the mass action. The H chemical shift-based CMC values are in excellent agreement with those determined by the surface tension method.48 The micellization processes of dodecyl trimethyl ammonium halides (chloride and bromide) studied by calorimetric titration show different behaviors at 298 K. However, these disappear at 313 K, while the results measured by the chemical shift versus surfactant concentration do not show this difference.49 The CMC of 3-aminopropyl triethoxy silane in toluene is ca. 0.47m, measured by H and l3C chemical shifts.50 The CMC of optically active potassium A -n-dodecanoyl alaminate measured by H and l3C chemical shifts is lower (11-15 him) in D20 than that in a mixed solvent of 1,4-dioxane and D20 (19mM).-51 The H chemical shift shows that the CMC of resorcinol-type calix[4] phosphoric esters having four alkyl side-chains, [4]Ar 5P-R-n, is insensitive to the length of the side-chains, n.52 The CMC values of a family of surfactants, the sodium cyclohexyl alkanoates, with different lengths of the alkanoate side-chains, were obtained from 13C chemical-shift measurements. The results show that these amphiphiles have high CMCs (0.12-1.02 m).-53... 

Polymerized Microemulsion Systems. A microemulsion of styrene and divinylbenzene with CTAB + hexanol may readily be made, and subsequently polymerized to form a polymerized microemulsion (5,6,7). This system exhibits two sites of solubilisation for photosystems such as pyrene, one in the surfactant skin layer, and the other in the polymerized styrene-divinylbenzene core. Photochemical reactions induced in the surfactant skin are very similar to those observed in micelles and are not immediately of concern to us at this stage. However, photochemical reactions induced in the rigid polymerized core are of interest, as they essentially confine reactants to a small region of space where movement is restricted as compared to a fluid non-polymerised microemulsion or a micelle. Thus, diffusion is minimised, and it may be possible to investigate reactions which occur over a distance rather than reactions which occur by diffusion. In order to eliminate reactions in the surfactant skin a microemulsion can be constructed which contains cetyl pyridinium chloride in place of CTAB. The pyrene that resides in the surfactant skin layer is immediately quenched by the pyridinium group following excitation. 

In the Pt-doped hexagonal mesophase formed from CPCI (cetyl pyridinium chloride), platinum ions are adsorbed at the surface of the surfactant cylinders. They are reduced radiolytically into a metal layer as a nanotube of around 10 nm diameter and a few hundred nm long (Fig. 3f). Extraction of all these nanostructures is achieved by dissolution of the soft template using alcohol. This possible easy extraction constitutes a marked advantage over the synthesis in hard templates, such as mesoporous silica or carbon nanotubes, the dissolution of which is more hazardous for the metal nanostructures. 

Chemicals. N,N-dimethyldodecylamine-N-oxide (DDAO) and cetyl trimethyl-ammonium bromide (CTAB) were purchased from Fluka Chemical Corp. Cetyl pyridinium chloride (CPC) and polyoxyethylene nonyl phenyl ether, with an average degree of polymerization of 10 (NP(EO)2q) were obtained from Hexacel Corp. and... 

A comprehensive study of coated anion-exchange resins provides some valuable insights [20]. Of several coating materials tested, cetyl pyridinium chloride (CPI) was found to be the most satisfactory. Static coating was employed with 1-3 x I0 M CPCI in 3 % (v/v) acetonitrile-97 % water. Coating of a polyacrylate resin (Rohm Haas XAD-8) gave sharper chromatographic peaks for anions than the more hydro-phobic PS-DVB resin (Hamilton PRP-1). 

Acetoquat CPC AI3-15070 Aktivex Ammonyx CPC Biosept Caswell No. 166A Ceeprin chloride Ceepryn Ceepryn chloride Cepacol Cepacol chloride Ceprlm Cetamium Cetilpiridinio cloruro Cetyl pyridinium chloride Cetylpyridini chioridum Cetylpyridinium chloride Cetylpyridinium chloride anhydrous Chiorure de... 

Microporous silicas with pore size of 12.2 A were prepared by either S XT or S " pathways at room temperature using dodecyidimethylbenzylammonium chloride (DDBAC) surfactant. The pore size of the synthesized materials could be tuned from microporous to mesoporous range by the crystalline temperature or using mixed surfactants of DDBAC and cetyl-pyridinium chloride. The pore structure can transfer from disordered tubular array to ordered hexagonal phase by the increase of the molar ratio of CPCl to DDBAC. 

Recently, Beletskaya and coworkers reported the use of Pd colloids stabilised by block-copolymer micelles formed by polystyrene-co-poly(ethylene oxide) and cetyl-pyridinium chloride as surfactant [37]. The material exhibited moderate to high activities and high recyclability for the Heck reaction between aryl iodides and acrylates. 

Figure 8 - X-ray Diffraction Pattern of Zirconium Phosphate Seeded with Cetyl Pyridinium Chloride (Zr CPC)...

La Saponara and co-workers have demonstrated that the non-covalent surface treatment of the CNTs using hexamethylene diamine and one of two surfactants, (Triton X-100) or cetyl pyridinium chloride (CPC), enabled the production of reinforced fibreglass-reinforced panels, which were prepared with treated CNT/epoxy by hand lay-up. The surface treatment with diamine/CPC resulted in the most superior composites with improved mechanical performance, higher resistance to fatigue and impact damage (over 30... 

N-Cetylpyridinium bromide. See Cetyl pyridinium bromide Cetyl pyridinium chloride CAS 123-03-5 (anhyd.) 6004-24-6 (monohydrate) EINECS/ELINCS 204-593-9 UN 2811 (DOT)... 

Aluminum bromohydrate Aluminum chloride anhydrous Aluminum chlorohydrate Aluminum citrate Aluminum dichlorohydrate Aluminum phenolsulfonate Aluminum sesquichlorohydrate Aluminum sulfate Aluminum zirconium octachlorohydrate Aluminum zirconium octachlorohydrex GLY Aluminum zirconium pentachlorohydrate Aluminum zirconium pentachlorohydrex GLY Aluminum/zirconium tetrachlorohydrate Aluminum zirconium tetrachlorohydrex GLY Aluminum zirconium trichlorohydrate Aluminum/zirconium trichlorohydrex GLY Ammonium phenolsulfonate Cetyl pyridinium chloride Chlorothymol Cloflucarban Farnesol Lapyrium chloride Lichen (Usnea barbata) extract Linalool Methylbenzethonium chloride Phenethyl alcohol Phenol 2-Phenylethyl acetate Potassium alum anhydrous Quaternium-18 methosulfate Sodium aluminum chlorohydroxy lactate Sodium phenolsulfonate Steapyrium... 

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