• Title, Summary, Keyword: Quarternary ammonium salts

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Corrosion Inhibition of Aluminium using 3-Hydroxy flavone in the Presence of Quarternary Ammonium Salts in NaOH Medium

  • Princey, J. Morris;Nagarajan, Prabavathi
    • Journal of the Korean Chemical Society
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    • v.56 no.2
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    • pp.201-206
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    • 2012
  • The anticorrosive effect of 3-Hydroxyflavone (3HF) in combination with quarternary ammonium bromide and iodide salts (QAB and QAI) for aluminium corrosion in NaOH medium was studied at the temperature range of 303K-323K using weight loss study, potentiodynamic polarization study and impedance spectroscopic measurements. The results revealed that the inhibition efficiency increases with the inhibitor concentration and it further increases on the addition of quarternary ammonium bromide and iodide salts. The enhanced inhibition efficiency of the inhibitor in the presence of quarternary ammonium salts may be due to synergistic effect. The adsorption process of 3HF on the aluminium surface obeys Langmuir's adsorption isotherm. The mechanism of adsorption is further supported by Scanning Electron Microscopic study (SEM).

Studies on the Chemical Analysis of the Tertiary Amine Salt and Quaternary Ammonium Salt by Tetrathiocyanatocobaltate[II] (3급 아민염 및 4급 암모늄염의 Tetrathiocyanatocobaltate[II]에 의한 분석화학적 연구)

  • 엄동옥;이윤중
    • YAKHAK HOEJI
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    • v.24 no.3_4
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    • pp.159-165
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    • 1980
  • Tetrathiocyanatocobaltate[II] forms complexes with tertiary amine salts or quarternary ammonium salts which were extractable from aqueous solution by organic solvent. In order to study composition of the complex, the colored crystalline complexes produced were evaluated with elemental analysis, infrared and mass spectra. And also a novel spectrophotometric method for the determination of tertiary amine salt or quarternary ammonium salt with tetrathiocyanatocobaltate[II] was established by organic solvent extraction within coefficient of variation of 1.06-1.35%.

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Modification of Polyacrylonitrile with Quarternary Ammonium Salts (제 4급 암모늄염에 의한 PAN 섬유의 개질)

  • 김호정;박차철;김한도
    • Textile Science and Engineering
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    • v.29 no.10
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    • pp.47-54
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    • 1992
  • To improve the low moisture regain and the static electricity of polyacrylonitrile(PAN) fiber, quacternary ammonium salts such as 3-(trimethoxysilyl) propyl dimethyl octadecylammo-nium chtoride(SAC) and alkylbenzyl dimethylammonium chloride(BAC) were mixed with PAN m DMF. As the increase of content of salts, the moisture regain increased and the static charge decreased significantly. The contact angle of modified PAN decreased with increasing BAC content, however the contact angle increased with increase of SAC content for the water repellent surface property. The results of reduction rates of colonies showed good antimicrobial activity of salts.

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Electrochemical Properties of Buckminsterfullerene ($C_{60}$) in Acetonitrile Containing Quarternary Ammonium Electrolytes

  • Kim, Il Kwang;Kim, Hyun Jin;Oh, Gi Su;Jeon, Il Chol;Ahn, Byoung Joon
    • Analytical Science and Technology
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    • v.8 no.4
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    • pp.675-682
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    • 1995
  • Thin films of buckminsterfullerene($C_{60}$) formed by solution drop casting on Pt foil electrode surfaces were studied by cyclic voltammetry(CV) in acetonitrile(MeCN) containing quaternary ammonium or alkali-metal salts as supporting electrolyte. The electrochemical behaviors of $C_{60}$ films are found to be strongly dependent on the nature of the supporting electrolytes, especially with tetrabutyl ammonium perchlorate (TBAP, $NBu_4ClO_4$), and tetrabutyl ammonium tetrafluoroborate ($TBABF_4$, $NBu_4BF_4$). Reasonably stable films are formed into which electrons can be injected. The interaction of $C_{60}$ film with the quaternary ammonium cation may produce the fulleride salts $(TBA^+)(C{_{60}}^-)$ and $(TBA^+)_2(C{_{60}}^{2-})$. The bulk electroreduction with a controlled potential to generate the soluble $C{_{60}}^{3-}$ anions(dark red-brown color) is followed by electrooxidative deposition to produce a neutral $C_{60}$ film on the surface. The peak currents($I_{pc}$ and $I_{pa}$) of these thin film were dramatically decreased with repetitive potential scanning. These results could be explained by the adsorption-desorption phenomena and ion pairing interaction of reduced species($C{_{60}}^-$, and $C{_{60}}^{2-}$) onto the electrode surface. The peak current changes and peak potential shifts of the thin $C_{60}$ film in cyclic voltammograms formed from solution were observed by varying scan rates.

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The Catalytic Effects of o-Iodosobenzoate Ion on Hydrolysis of p-Nitrophenylvalate in ETAMs Solution (ETAMs 용액내에서 p-Nitrophenylvalate의 가수분해반응에 미치는 o-Iodosobenzoate Ion의 촉매효과)

  • Kim, Jeung-Bea
    • Journal of Environmental Science International
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    • v.20 no.1
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    • pp.119-126
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    • 2011
  • In this study, reaction model and reactions rate accelerated by o-iodosobenzoate ion(IB$^{\ominus}$) on hydrolysis reaction of p-nitrophenyl valate(NPV) using ethyl tri-octyl ammonium mesylate(ETAMs) for quaternary ammonium salts, the phase transfer catalysis(PTC) reagent, were investigated. The effect of IB$^{\ominus}$ on hydrolysis reaction rate constant of NPV was weak without ETAMs solutions. Otherwise, in ETAMs solutions, the hydrolysis reactions exhibit higher first order kinetics with respect to the nucleophile, IB$^{\ominus}$, and ETAMs, suggesting that reactions are occurring in small aggregates of the three species including the substrate(NPV), whereas the reaction of NPV with OH$^{\ominus}$ is not catalyzed by ETAMs. Different concentrations of NPV were tested to measure the change of rate constants to investigate the effect of NPV as substrate and the results showed that the effect was weak. This means the reaction would be the first order kinetics with respect to the nucleophile. This behavior for the drastic rate-enhancement of the hydrolysis is referred as 'Aggregation complex model' for reaction of hydrophobic organic ester with o-iodosobenzoate ion(IB$^{\ominus}$) in hydrophobic quarternary ammonium salt(ETAMs) solutions.

Influence of Suspending Agents on the Bactericidal Action of Cationic Surfactants and Amphoteric Surfactants -Influence on the Bactericidal Action of Codecyl Diaminoethyl Glycine and Benzalkonium Chloride- (분산안정제가 cationic surfactant와 amphoteric surfactant의 살균력에 미치는 영향 Dedecyl Diaminoethyl Glycine 및 Benzalkonium Chloride의 살균력에 미치는 영향)

  • 이진환
    • YAKHAK HOEJI
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    • v.11 no.3_4
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    • pp.17-21
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    • 1967
  • At present, quarternary ammonium salts(cationic surfactant) and Tego compounds (amphoteric surfactant) are used as germicidal agent. In this paper, it was investigated whether their germicidal activities are influenced or not by some suspending agents which are added to them 0.005% benzalkonium chloride aq. solution and 0.05% dodecyl diaminoethyl glycine aq. solution sterilized respectively against Staphylococcus aureus and Escherichia coli within a minute. The solutions aded acacia, carboxymethyl cellulose, sodium alginate solutions to make to 0.005% to above surfactants solution decreased the germicidal activity, not being sterilized bacteria for more than 2 hours however, the solutions decreased the germicidal activity by addition of suspending agents such as acacia, carboxymethyl cellose, sodium alginate and bacteria were survival for more than 2 hrs, 0.05% of benzalkonium chloride and 0.1% dodecyl diaminoethyl glycine respectively would be sterilized within 10 minutes, when added to 5% suspending agents. This result show that bactericidal action of dodecyl diaminoethyl glycine is affected by suspending agents less than that of benzalkonium chloride.

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Synthesis and Reaction of Biheterocyclic Thiazolo[3,2-a]pyrimidinium-betaines

  • Yoo, Kyung-Ho;Park ,Sang-Woo
    • Bulletin of the Korean Chemical Society
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    • v.6 no.5
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    • pp.272-276
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    • 1985
  • Various new kinds of biheterocyclic betaines were prepared by the reaction of 3-substituted-6,7-dihydro-5H-thiazolo[3,2-a]pyrimidine with electrophiles such as isothioyanates, isocyanates in aprotic solvents, respectively. The biheterocyclic betaines containing methyl group at 3-position of thiazole ring were obtained particularly in good yields at room temperature. These betaines were also reacted with alkyl halide to give quarternary ammonium salts. It was found that these betaines are dissociated in polar organic solvents depending on temperature. And new biheterocyclic compounds via ring transformation were prepared by the reaction of 8-phenyl (thiocarbamoyl)-3-phenyl-6,7-dihydro-5H-thiazolo[3 ,2-a]pyrimidinium-betaine with ${\alpha}$-halo kester ${\alpha}-halo$ ester and ${\gamma}-halo$ keto ester.

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Fabrication of Perchlorate Ion Selective PVC Membrane Electrode (과염소산 이온선택성 PVC막전극 제작)

  • 우인성;안형환;강안수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.4
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    • pp.298-305
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    • 1998
  • The PVC membrane electrode for measuring perchlorate ion was developed by incorporating various quaternary ammonium sallts. The effect of chemical structure, the content of active material, the kind of plasticizers, and the membrane thickness on the electrode characteristic such as the linear response range and Nernstian slope of the electrode were studied. It was obtained that the effect of the chemical structure of an active material on the electrode characteristics was improved with increasing the alkyl chain length of the quarternary ammonium salts in the ascending order of Aliquat 336P, TOAP, TDAP, and TDDAP. The optimum membrane composition was 9.09wt% of TDDAP, 30.3wt% of PVC, and 60.6wt% of plasticizer(DBP). And the optimum membrane thickness was 0.45mm at this composition. Under the above condition, the linear response range was $10^{-1}~1.2\times10^{-6}$M, and the detection limit was $5.1\times10^{-7}$M with the Nernstian slope of 57mV/decade of activity of perchlorate ion. The electrode potential was stable within the pH range from 4 to 11. The selectivity coefficient was as shown below: $SCN^->I^-NO_3^->Br^->ClO_3^->F^->Cl^->SO_4^{2-}$

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Perchlorate Ion-Selective PVC Membrane Electrode Based on the Quaternary Ammonium Salts (제4급 암모늄염을 이용한 과염소산 이온선택성 PVC막 전극)

  • 안형환;김용렬;강현춘;이한섭;이병철;강안수
    • Membrane Journal
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    • v.3 no.3
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    • pp.126-135
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    • 1993
  • Perchlorate ion-selective PVC membrane electrode responsive to $10^{-6}M$ was developed by incorporating the ion-pair complex of perchlorate with the quaternary ammonium salts as a active material. The effect of chemical structure, the content of active material, the kinds of plasticizers, and the membrane thickness on the electrode characteristics such as the linear response range and Nernstian slope of the electrode were studied. With the results, the useful pH range and the selectivity coefficients to various interfering anions were compared and investigated. It was obtained that the effect of the chemical structure of an active material on the electrode characteristics was improved with increasing the alkyl chain length of the quarternary ammonium salts in the ascending order of Aliquat 336P, TOAP, TDAP, and TDDAP. The electrode characteristics was improved with the decrease of the active material content below the optimum membrane composition, and DBP was the best as a plasticizer. The optimum membrane composition was 9.09wt% of TDDAP, 30.3wt% of PVC, and 60.6wt% of ptasticizer(DBP). And the optimum membrane thickness was0.45mm at this composition. Under the above condition, thelinear response ranger was $10^{-1}~1.2 {\times} 10^{-6}M$, and the detection limit was $5.1{\times}10^{-7}M$ with the Nernstian slope of 57mV/decade of activity of perchlorate ion. The electrode potential was stable within the pH range from 4 to 11. The selectivity coefficient was as shown below : $SCN^->I^->NO_3^->Br^->ClO_3^->F^->Cl^->SO_4^{2-}$

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