Results 221 to 230 of about 61,390 (300)

Quaternary ammonium salts as thermodynamic hydrate inhibitors in the presence and absence of monoethylene glycol for methane hydrates

, 2020
The thermodynamic hydrate inhibition (THI) effect induced by three different quaternary ammonium salts (QASs) namely tetraethylammonium iodide (TEAI), tetramethylammonium bromide (TMAB) and tetraethylammoniun (TEAB) on the formation of methane gas ...
Ali Qasim, Muhammad Saad Khan, B. Lal, M. Ismail, K. Rostani   +4 more
semanticscholar   +1 more source

Chemical transformations of quaternary ammonium salts via C-N bond cleavage.

Organic and biomolecular chemistry, 2020
Quaternary ammonium salts are readily prepared and show good reactivity in various organic transformations via C-N bond cleavage. In this review we summarize reactions of aryl, benzyl, allyl and propargyl quaternary ammonium salts including cross ...
Zhong‐Xia Wang, Bo Yang
semanticscholar   +1 more source

Thiacalixarene based quaternary ammonium salts as promising antibacterial agents.

Bioorganic & Medicinal Chemistry, 2020
The search for new antibacterial and antiseptic drugs is an urgent problem due to the resistance of microorganisms to existing drugs. In this work, for the first time, the design of antibacterial and bactericidal agents based on quaternary ammonium ...
P. Padnya, O. Terenteva, A. Akhmedov, A. G. Iksanova, N. Shtyrlin, E. Nikitina, Elena S. Krylova, Y. Shtyrlin, I. Stoikov   +8 more
semanticscholar   +1 more source

Enhanced antioxidant and antifungal activity of chitosan derivatives bearing 6-O-imidazole-based quaternary ammonium salts.

Carbohydrate Polymers, 2019
In this paper, a series of 6-O-imidazole-based quaternary ammonium chitosan derivatives via 6-O-chloroacetyl chitosan (CAClC) were successfully designed and synthesized.
Lijie Wei, Qing Li, Yuan Chen, Jingjing Zhang, Yingqi Mi, Fang Dong, Chunqing Lei, Zhanyong Guo   +7 more
semanticscholar   +1 more source

Hydrate Plug Prevention by Quaternary Ammonium Salts

Energy & Fuels, 2005
The use of low-dosage inhibitors is an alternative to thermodynamic inhibitors to prevent gas hydrates from plugging oil production pipelines. In this work, quaternary ammonium salts (QAs) with different structures were tested as hydrate plug inhibitors on model systems containing 1/1/4/X proportions (by weight) of water/THF/oil/QA systems.
Zanota, Marie-Line, Dicharry, Christophe, Graciaa, Alain   +2 more
openaire   +2 more sources

Utilizing dextran to improve hemocompatibility of antimicrobial wound dressings with embedded quaternary ammonium salts.

International Journal of Biological Macromolecules, 2019
Dextran, a polysaccharide with interfering effects on coagulation hemeostasis was utilized to compensate the hostile effects of quaternary ammonium salts (QAS) embed in the backbone of a wound dressing membrane as an antimicrobial agent. Despite the high
Reza Gharibi, S. Kazemi, H. Yeganeh, V. Tafakori   +3 more
semanticscholar   +1 more source

Phase equilibrium measurement and modeling approach to quaternary ammonium salts with and without monoethylene glycol for carbon dioxide hydrates

Journal of Molecular Liquids, 2019
This experimental work evaluates the thermodynamic hydrate inhibition behavior of three quaternary ammonium salts (QAS) namely tetra ethyl ammonium iodide (TEAI), tetra methyl ammonium bromide (TMAB) and tetraethyl ammonium bromide (TEAB) for carbon ...
Ali Qasim, Muhammad Saad Khan, B. Lal, A. Shariff   +3 more
semanticscholar   +1 more source

Anchored quaternary ammonium salts adsorbed on polyurethane film surfaces

, 2020
A flexible, thermoset and transparent polyurethane (PUR) film with high glass transition temperature, has been deployed as a substrate for anchoring anti-bacterial molecular layers.
R. Mathew, R. Cooney, C. Doyle, S. Swift, C. Haessler   +4 more
semanticscholar   +1 more source

The synthesis of quaternary ammonium salts from ammonium salts and dialkyl carbonate

Chemical Communications, 2006
Quaternary ammonium salts were synthesized from ammonium salts and dialkyl carbonates over an ionic liquid catalyst 1-ethyl-3-methylimidazolium bromide.
Zhuoqun, Zheng, Tinghua, Wu, Xiaoping, Zhou   +2 more
openaire   +2 more sources

Polycyclic Quaternary Ammonium Salts.

1954
PhD ; Pharmacology ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/181374/2/0011296 ...
openaire   +2 more sources