The composite consisting of a mixture bis-GMA/UDMA/HEMA/TEGDMA monomers forming polymer matrix filled with silanized silica (45 wt%) was modified CTAB or DODAB quaternary ammonium salts (0.5‒2.0 wt%). hardness, flexural strength and diametrical tensile the before after modification were tested. type amount salt affect shrinkage stress, but it does not tested composites.

Quaternary ammonium salts (QAS), both linear and bicyclic, are often utilized to improve the mass spectrometry (MS) analysis of peptides by fixing a permanent positive charge on the analyzed molecule. However, during collision-induced dissociation (CID) experiments, QAS undergo unwanted side reactions-Hofmann elimination as well as a tertiary amine loss- rendering the data interpretation compli...

The germicidal potency of quatemary ammonium compounds is known to depend mainly on the chemical structure of the cation, the nature of the anion having little if any effect (Glassman, 1948). The relation of structure of the cation to bactericidal activity has been studied extensively insofar as chain length of the hydrophobic or hydrocarbon group is concerned. In compounds with only one long c...

N-dodecyl-N,N-dimethyl-N-benzylammonium halides (DBeAX), like many other amphiphilic quaternary ammonium salts, show biological activity. One of these halides is a major component of "benzalkonium chloride", which is widely used as an antiseptic in pharmaceutical preparations. The mechanism responsible for the antimicrobial action of surfactants is not clearly understood, particularly the role ...