... agriculture and soils in general and herbicides specifically ( Boyd and Jaynes 1994 ). Tetra-alkylammonium (e.g. tetramethylammonium) salts have been used to produce organoclays in the last few decades, acting as surfactants with polar features (ammonium groups) and an apolar moiety (alkyl groups...

...Fethi Kooli; Jacques Plevert; Yan Liu; Kais Hbaieb; Rawan Al-Faze Abstract A synthetic protonic magadiite was used as a silica source to prepare zeolitic material (PLS-1) in the presence of tetramethylammonium hydroxide and water. The conversion of the protonic magadiite to the PLS-1 phase...

...Figure 2. Sorption isotherms of naphthalene by smectite (SWy-2) saturated with ammonium, tetramethylammonium (TMA), trimethylphenylammonium (TMPA) or hexadecyltrimethylammonium (HDTMA). ...

... with tetramethylammonium hydroxide coupled to gas chromatography and mass spectrometry (THM-GC–MS). The results were compared with previous data acquired on the same samples using ultraviolet spectroscopy and the stable C isotope ratio. The correlation between molecular markers and bulk-scale descriptors validated the use...

...Candice A. Johns; Rubén Martos-Villa; Stephen Guggenheim; C. Ignacio Sainz-Díaz Abstract The structure of trimethylsulfoxonium-exchanged vermiculite has been examined to compare it with other onium-exchanged structures, such as tetramethylammonium- and tetramethylphosphonium-exchanged vermiculite...

... was excellent using H + /TMA + -clays derived from SWy-2, STx-1 and Sap-Ca. The relatively low activity of H + -SAz-1 was reduced significantly upon incorporation of tetramethylammonium (TMA + ) cations, as it was by the incorporation of polycations ( Breen & Watson, 1998 ). This behaviour was attributed...

... with organic salts: tetramethylammonium (TMA) chloride, octyltrimethylammonium (OTMA) bromide, and octadecyltrimethylammonium (ODTMA) bromide. Physico-chemical characterizations of the organo-clays used as fillers in rubber nanocomposites and their mechanical properties were measured using Fourier transform...

... is a relatively new phenomenon. The purpose of this study was to use NIR spectroscopy to investigate the effect of alkylammonium cations on the acid dissolution of a high-charge montmorillonite (SAz-1). Detailed analysis of the spectra of Li + -, TMA + - (tetramethylammonium), and HDTMA...

... microscopy (FE-SEM) techniques. Tetramethylammonium hydroxide was used as a precipitating agent. The precipitates were collected after heating of the precipitation systems at 160°C for 2 h. The XRD results showed the formation of goethite structure as a single phase up to r = 6.98 (where r = 100·[Co]/([Co...

.... Both the siloxane surfaces and TAA ions contributed to the overall sorption, with their relative contributions dependent on the TAA interionic distances and the basal spacings of TAA-SACs. High benzene sorption by small TAA-SAC (tetramethylammonium (TMA)-SAC) was attributed to the strong interactions...