Results 41 to 50 of about 476,117 (197)

Tetraalkylammonium and phosphonium salt for asphaltene dispersion; experimental studies on interaction mechanisms

Egyptian Journal of Petroleum, 2022
Asphaltenes deposition is one of the most severe problems in the petroleum industry, imposing high costs on oil producer companies. The use of chemical dispersants reduces the risk of asphaltene deposition.
Shirin Baghersaei, Babak Mokhtari, Nahid Pourreza, Bahram Soltani Soulgani   +3 more
doaj   +1 more source

Structure and mechanical properties of polyamide 6/Brazilian clay nanocomposites

Materials Research, 2009
Recent interest in polymer/organoclays nanocomposites systems is motivated by the possibility of achieving enhanced properties and added functionality at lower clay loading as compared to conventional micron size fillers.
Amanda Melissa Damião Leite, Edcleide Maria Araujo, Rene Anisio da Paz, Osanildo Damião Pereira, Hélio Lucena Lira, Edson Noriyuki Ito   +5 more
doaj   +1 more source

Synthesis and Catalytic Activity of Bifunctional Phase-Transfer Organocatalysts Based on Camphor

Molecules, 2023
Ten novel bifunctional quaternary ammonium salt phase-transfer organocatalysts were synthesized in four steps from (+)-camphor-derived 1,3-diamines. These quaternary ammonium salts contained either (thio)urea or squaramide hydrogen bond donor groups in ...
Luka Ciber, Franc Požgan, Helena Brodnik, Bogdan Štefane, Jurij Svete, Mario Waser, Uroš Grošelj   +6 more
doaj   +1 more source

Synthesis and Characterizaion of Adamantane-Containing Quaternary Ammonium Salts

, 2011
To develop the potential use of adamantane derivatives in surfactant field, the adamantyl residue was introduced into the quaternary ammonium salt. The method involved synthesizing N-(1-adamantyl)-N, N-dimethylamine from 1-adamantine and quaternizing ...
Nian Yun Guan, Le Jie Zhu, Chu Fen Yang, Sa Liu, Jian Wei Guo   +4 more
core   +1 more source

Preparation of a Non-Toxic Bisquaternary Quaternary Ammonium Salt from Rosin and its Application in Crop Protection

Engineered Science
Although quaternary ammonium salts are widely used in plant antifungal agents, their toxicity and renewability remain challenges. In this study, we synthesized three types of rosin-based gemini quaternary ammonium salts (Rbs): ortho- (o-Rbs), meta- (m ...
Chaoji Xiong, Bin Wu, Zhuo Xu, Kun Liang, Jia Deng, Wei Wu, Zefeng Wang, Qian Chen, Xiaoping Rao, Chunhua Wu   +9 more
doaj   +1 more source

Quaternary Ammonium Groups Modified Magnetic Cyclodextrin Polymers for Highly Efficient Dye Removal and Sterilization in Water Purification

Molecules, 2022
Water recovery is a significant proposition for human survival and sustainable development, and we never stop searching for more efficient, easy-operating, low-cost and environmentally friendly methods to decontaminate water bodies.
Bingjie Liu, Shuoxuan Wang, He Wang, Yong Wang, Yin Xiao, Yue Cheng   +5 more
doaj   +1 more source

Synthesis of Quaternary Heterocyclic Salts

Molecules, 2013
The microwave synthesis of twenty quaternary ammonium salts is described. The syntheses feature comparable yields to conventional synthetic methods reported in the current literature with reduced reaction times and the absence of solvent or minimal ...
Angela J. Winstead, Grace Nyambura, Rachael Matthews, Deveine Toney, Stanley Oyaghire   +4 more
doaj   +1 more source

The Phosphorylation of Anti-Adrenergic Quaternary Ammonium Salts Related to Choline

, 1962
Quaternary ammonium salts related to choline with anti-adrenergic properties have been phosphorylated. The resulting betaines were used to investigate a possible means for improving the oral absorption of quaternary ammonium salts.
F C Copp, A McCoubrey, T S G Jones
core   +1 more source

Synthesis and Antifungal Activity of Novel Tetrahydrogeranyl Quaternary Ammonium Salts

Natural Product Communications, 2022
Due to the excessive use of antifungal agents, drug resistance and ecological problems are increasing. Some antifungal agents are difficult to degrade and have high toxicity and several side effects.
Yun Peng, Jiayu Chang, Zhuangquan Xiao, Jiazong Huang, Ting Xu, Shangxing Chen, Guorong Fan, Shengliao Liao, Zongde Wang, Hai Luo   +9 more
doaj   +1 more source

Chemotherapeutic Properties of Some New Quaternary Ammonium Salts: Part I. Chemistry

, 1959
The preparation of a large number of new heterocyclic quaternary ammonium salts for biological screening is described. Certain of the quaternary salts possess amoebicidal, antibacterial, antifilarial and trypanocidal activity.
L H C Lunts, M D Potter, W C Austin, E P Taylor   +3 more
core   +1 more source