Examples of positively charged headgroups are trimethylammonium
propane (TAP) and dioctadecyl ammonium bromide (DA), while negatively charged headgroups are phosphatidylserine (PS), phosphatidylinositol (PI), phosphatidylglycerol (PG), or phosphatidic acid (PA), and finally neutral headgroups are phosphatidylcholine (PC) or phosphatidylethanolamine (PE).
CR-2000 (3-chloro-2-hydroxypropyl trimethylammonium
chloride, CAS number 0003327-22-8) was obtained from Dow Chemical (Midland, MI, USA) and abbreviated as CHPTAC.
Critical micelle concentrations of binary surfactant mixtures (CTAB = cetyl sodium dodecyl sulphate and trimethylammonium
bromide, NaOct = sodium octanoyate SDS Mole SDS/ SDS/ CTAB/ NaOct/ NaOct/ SDS/ fraction CTAB Tween-20 Tween-20 CTAB Tween-20 NaOCt 0 0.98 0.071 0.071 25.0 23.0 8.32 0.17 1.10 0.074 0.081 28.2 27.9 9.75 0.25 1.26 0.090 0.092 30.1 28.6 10.5 0.50 1.60 0.128 0.122 39.6 37.2 15.0 0.75 2.32 0.212 0.236 52.7 56.3 24.4 0.83 3.03 0.296 0.406 62.3 72.3 32.2 0.91 3.67 0.403 - 73.2 76.5 - 1 95.5 0.993 96.7 95.5 97.5 95.5
Ionomycin, 1-(trimethylammoniumphenyl)-6-phenyl-1,3,5-hexatriene p-toluenesulfonate (TMA-DPH), Alexa Fluor 488 Phalloidin Conjugate, and 6-hexadecanoyl2-(((2-(trimethylammonium
)ethyl)methyl)amino)naphthalene chloride (patman) were obtained from Life Technologies (Grand Island, NY, USA).
In this paper, sericite was activated by thermal modification, acid activation, and sodium modification, and the intercalated sericite was prepared by the intercalation of cetyl trimethylammonium
ions ([CTA.sup.+]) into activated sericite.
The method is comprised of attaching a reactive group X--Y to a surface of a pigment; and subsequently displacing Y with an organic substrate N--S--ZM to form a surface-modified pigment having attached X--N--S--ZM; wherein X is a sulfonyl, phosphoryl, or 1,3,5-triazine group; Y is fluorine, chlorine, bromine or iodine; N is an amine, an imine, a pyridine, or a thiol group; S is substituted or unsubstituted alkyls, aryls, or polymer chains having a molecular weight range from approximately 300-8000; Z is a carboxyl, sulfonyl, phenolic, phosphoryl, ammonium, trimethylammonium
, or tri-butylammonium group; and M is a halide, a negatively charged ion, a proton n salt form, or a cation in salt form.
For example, acrylic acid, sodium acrylamidopropane sulfonate, and acryloylethoxyethyl trimethylammonium
chloride were polymerized in the presence of soyamidopropyl dimethylamine, in aqueous solution, to synthesize the desired complex.
Genomic DNA was extracted manually via precipitation with trimethylammonium
bromide salts from leukocytes contained in 450 ul of venous blood using ethylenediaminetetraacetic acid (EDTA) as an anticoagulant.
Reagents (analytical grade): 5,5'-Dithiobis(2-nitrobenzoic acid (DTNB), (2-Mercaptoethyl) trimethylammonium
iodide (thiocholine iodide), 1-chloro-2,4-dinitroben zene (CDNB), reduced glutathione (GSH), Tri chloroacetic acid (TCA), Thiobarbituric acid (TBA), Tris-HCl, Diethylene triamine pentaacetic acid (DTPA), buthylated hydroxytoluene (BHT) dipotassium phosphate and monopotassium phosphate, Bradford reagent and the Bovine g-globulin.
The TMC was characterized by [sup.1]H NMR and the spectrum showed an intense signal at 3.16 ppm corresponding to the trimethylammonium
group in addition to other functional groups (Fig.
Table 2: Surfactants used and their cmc values Systematic name Abbreviation cmc Manufacturer ([mM.sup.6] Sodium dodecyl SDS 8.1 BDH sulfate Octa-ethylene [C.sub.12][E.sub.8] 0.071 Nikkol glycol mono n-dodecyl ether Hexadecyl [C.sub.16]TAB 0.9 Merck trimethylammonium
bromide Polystyrene latex particles with a mean diameter of 350 nm were purchased from Polysciences Inc., USA, and obtained as a stock solution of 2.6 wt%.
Ligands with poly-functional group, such as ethylenediaminetetraacetic acid disodium (EDTA) and Cetyl trimethylammonium
bromide (CTAB), etc., can be used as structure directing agents to control the morphology of nanoparticles, mostly because these "soft-templates" tend to coordinate with several inorganic ions to form multinuclear complexes.