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1.
A. M. Badawi M. A. Mekawi A. S. Mohamed M. Z. Mohamed M. M. Khowdairy 《Journal of surfactants and detergents》2007,10(4):243-255
In this study, steps were taken toward the development of bactericidal and fungicidal synthetic cationic surfactants by reacting
decyl, dodecyl or tetradecyl amine with acetic or hydrochloric acid to produce a series of amine salts which consequently
converted to copper or cobalt cationic complexes via complexing the first series compounds with copper (II) or cobalt (II)
ions. Surface properties such as interfacial tension and emulsifying power of these surfactants were investigated. The surface
parameters including critical micelle concentration (CMC), maximum surface excess (Γmax) and minimum surface area (A
min) were studied. Free energy of micellization (ΔG°mic) and adsorption (ΔG°ads) were calculated. The antimicrobial activity was determined via the inhibition zone diameter of the prepared compounds, which
measured against five strains of a representative group of microorganisms. FTIR spectra, elemental analysis and H1 NMR spectrum were performed to confirm compound structure and purity.
相似文献
M. Z. MohamedEmail: |
2.
《Journal of Industrial and Engineering Chemistry》2014,20(4):1633-1640
Three cationic surfactants were prepared. A condensation reaction between dimethylaminopropylamine (DMAPA) and benzaldehyde was performed. The produced Schiff base was quaternization with three fatty alkyl bromide with different carbon chain length separately to form the desired cationic surfactants. The chemical structure of synthesized cationic surfactants was confirmed by FTIR, 1H NMR and mass spectroscopy. It was found that the chemical structure of prepared compounds has an effect on surface properties, where increasing the hydrophobic chain length decrease the values of CMC, Гmax while Amin value was increased. The thermodynamic parameters showed that adsorption and micellization processes are spontaneous. It is clear that the prepared cationic surfactants at first tend to adsorb at surface, then it aggregate to form micelle. The prepared surfactants showed good biological activity against gram positive and negative bacteria and fungi in the following order of II (C12) > I (C10) > III (C16). The serial dilution method was used to evaluate the inhibiting effect of these compounds on the sulfate reducing bacteria growth. 相似文献
3.
Abdelfattah M. Badawi Mohamed Ahmed Mekawi M. Z. Mohamed A. S. Mohamed M. M. Khowdairy 《Journal of surfactants and detergents》2007,10(4):257-267
In this article we show steps taken toward the development of bactericidal and fungicidal synthetic cationic surfactants by
the reaction of decyl, dodecyl or tetradecyl amine with selenious acid to produce a series of quaternary ammonium salts which
consequently converted to copper and cobalt cationic complexes via complexing them with copper (II) or cobalt (II) ions. Surface
properties of these surfactants were investigated. The surface properties studies included critical micelle concentration
(CMC), maximum surface excess (Γmax) and minimum surface area (A
min). Free energy of micellization (
) and adsorption () were calculated. The antimicrobial activity was determined via the inhibition zone diameter of the prepared compounds measured
against five strains of a representative group of microorganisms. FTIR spectra, elemental analyses and 1 H-NMR spectra were obtained to insure the purity of the prepared compounds
相似文献
M. Z. Mohamed (Corresponding author)Email: |
4.
《Journal of Industrial and Engineering Chemistry》2014,20(6):4194-4201
The chemical structure of the prepared cationic surfactants which formed through condensation reaction between dimethylaminopropylamine (DMAPA) and butyraldehyde then quaternized by three fatty alkyl bromide was confirmed by FTIR, 1HNMR and mass spectroscopy. The chemical structure of prepared compounds has an effect on surface properties. By increasing the hydrophobic chain length, the values of CMC and Гmax decrease while Amin value was increased. The Thermodynamic parameters showed that adsorption and micellization processes are spontaneous. It is clear that the prepared cationic surfactants tend to adsorb at surface, then it aggregate to form micelle. The prepared surfactants showed good biological activity against Gram-positive and negative bacteria and fungi. The prepared cationic surfactant showed aggressive effect on the sulfate reducing bacteria growth. 相似文献
5.
Nabel A. Negm Medhat M. Said Salwa M. I. Morsy 《Journal of surfactants and detergents》2010,13(4):521-528
Five membered heterocyclic cationic 3-pyrazolium surfactants namely: 2-[2-(alkyloxy)-2-oxoethyl]-3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-3-pyrazolium bromide (decyl-; dodecyl-) and their copper and tin complexes were synthesized, their structures were confirmed
using different spectroscopic tools. The IR spectra of the metal complexes showed that these compounds exhibit a tetrahedron
structure with the transition metal ion (M2+) at the center and the cationic ligands arranged in the apexes, while the halide ions in the center. The synthesized compounds
were evaluated as biocides against different types of bacteria and fungi. The biological activity data showed that the cationic
surfactants exhibit moderate to high efficacy against the tested microorganisms (either bacteria or fungi). While, complexation
of these cationic surfactants with Cu (II) and Sn (II) ions the antimicrobial activity was strongly increased. The surface
activity of these compounds were discussed and correlated to their chemical structure and the type of substituents on the
heterocyclic moiety. Meanwhile, the antimicrobial assay was correlated to the surface activities of the synthesized compounds. 相似文献
6.
Ismail Aiad Mohamed M. El-Sukkary Ali El-Deeb Moshira Y. El-Awady Samy M. Shaban 《Journal of surfactants and detergents》2012,15(3):359-366
Novel iminium compounds namely p-benzylidene benzyldodecyl iminium chloride (I), p-benzylidene benzylhexadecyl iminium chloride (II), p-benzylidene benzyloctadecyl iminium chloride (III) were prepared and characterized using FTIR, 1H-NMR and mass spectroscopy. The surface properties such as surface and interfacial tension, and biological activity of these
surfactants were investigated. The surface parameters including critical micelle concentration, maximum surface excess, and
minimum surface area. Efficiency and effectiveness were calculated, as well as free energies of micellization and adsorption.
The prepared cationic surfactants exhibit a better biological activity than the used reference cetyl trimethyl ammonium bromide. 相似文献
7.
Yongbo Song Qiuxiao Li Yunling Li Lifei Zhi 《Journal of surfactants and detergents》2014,17(3):459-464
The biological properties of novel guanidine‐based cationic surfactant including mono‐alkylguanidine (CnG), N,N,N′‐dimethyl alkylguanidine (CnMG), dicephalic guanidine surfactant (CnGQ), heterogemini guanidine surfactant (diCnGQ) were investigated. Antimicrobial activity was determined via the inhibition of cell viability of the prepared compounds, which was measured against three strains of a representative group of microorganisms. The inhibitions of cell viability were basically about 90 % at the concentration of 25 mg L?1 to alkyl guanidium salts (CnG, CnMG), and higher than 95 % at a concentration of 10 mg L?1 to dicephalic guanidine surfactants (CnGQ) and heterogemini guanidine surfactants (diCnGQ). The interactions of bovine serum albumin (BSA) with guanidine surfactants were investigated by fluorescence technology and the effect on BSA conformation follow the order: diC12GQ > C12GQ > C12G > C12MG. At any particular concentration, the biological activity depends on the alkyl chain length to any series of guanidine‐based cationic surfactants. 相似文献
8.
Surface Parameters and Biological Activity of <Emphasis Type="Italic">N</Emphasis>-(3-(Dimethyl Benzyl Ammonio) Propyl) Alkanamide Chloride Cationic Surfactants 下载免费PDF全文
Samy M. Shaban Ismail Aiad Abdallah R. Ismail 《Journal of surfactants and detergents》2016,19(3):501-510
Three cationic surfactants containing amide groups were prepared by quaternization of dimethylaminopropylamine with benzyl chloride. FTIR and 1H-NMR spectroscopy were used to confirm the chemical structure of the prepared cationic surfactants. The surface parameters were estimated using surface tension measurements at three different temperatures. The prepared cationic surfactant showed a lower CMC than conventional cationic surfactants. Thermodynamic parameters of adsorption and micellization depend mainly of alkyl chain length and temperature. The adsorption process is more favorable than micellization. The biological activity of the three surfactants was estimated using inhibition zone showing that amidoamine cationic surfactants have good activity and the surfactants C12Bn is the most effective one. 相似文献
9.
A novel series of neutral and cationic dimeric surfactants were prepared involving ketalization reaction, Williamson etherification, and regioselective oxirane ring opening with primary and tertiary alkyl amines. The critical micelle concentration (CMC), effectiveness of surface tension reduction (gamma(CMC)), surface excess concentration (Gamma), and area per molecule at the interface (A) were determined and values indicate that the cationic series is characterized by good surface-active and self-aggregation properties. For the first time, we reported the antimicrobial activities against representative bacteria and fungi for dimeric compounds. The antimicrobial activity was found to be dependent on the target microorganism (Gram-positive bacteria > fungi > Gram-negative bacteria), as well as both the neutral or ionic nature (cationic > neutral) and alkyl chain length (di-C(12) > di-C(18) > di-C(8)) of the compounds. The cationic di-C(12) derivative was found to have equipotent activity to that of benzalkonium chloride (BAC) used as standard. 相似文献
10.
Nabel A. Negm Ismail A. Aiad Salah M. Tawfik 《Journal of surfactants and detergents》2010,13(4):503-511
Eight novel uracil-based cationic surfactants containing Schiff base species were synthesized and characterized using elemental
analysis, FTIR, 1H-NMR and 13C-NMR spectroscopy. The surface activities of the synthesized Schiff bases and their cationic derivatives were determined
based on interfacial tension measurements and partition coefficient values in water/octanol system. The synthesized Schiff
bases and their cationic derivatives were evaluated as novel biocides against different bacteria and fungi strains. The results
showed that the biocidal activity of the synthesized Schiff bases was considerably increased by quaternization. The influence
of the cationic surfactants as biocides was increased by increasing the hydrophobic chain length and the presence of the methoxy
groups. The biocidal activity was also increased by increasing the partition coefficient in water/octanol system. The structure
and surface activity/biocidal activity of the different compounds were discussed. 相似文献
11.
Synthesis and Characterization of Multifunctional Surfactants in Oil-Field Protection Applications 总被引:1,自引:0,他引:1
A series of cationic surfactants was prepared using economical raw materials. The chemical structures of the prepared compounds
were confirmed using elemental analysis, FTIR and 1H-NMR spectra, and melting point determination. The synthesized surfactants were evaluated as oil-field protective additives.
In this regard, several surface properties of the synthesized surfactants were studied including surface tension, critical
micelle concentration, effectiveness, efficiency, maximum surface excess and minimum surface area. The results obtained from
the surface activity measurements were correlated to their chemical structures. The emulsification power measurements for
solutions of these surfactants showed their low emulsifying tendency towards paraffin and crude oil. The synthesized surfactants
also exhibited high biocidal activity towards gram-positive and gram-negative bacteria and fungi. This activity was increased
by increasing the hydrophobic chain length. The corrosion inhibition measurement of these surfactants for mild steel alloys
in acidic media using a weight loss technique showed good protection of mild steel alloys against acidic environments. These
properties qualify the synthesized compounds as economical oil-field protective additives.
相似文献
Nabel A. NegmEmail: |
12.
M. R. Infante J. Molinero P. Bosch M. R. Juláa P. Erra 《Journal of the American Oil Chemists' Society》1989,66(12):1835-1839
Neutral Nα-lauroyl-dipeptides such as Nα-lauroyl arginylglycine and Nα-lauroyl-arginylphenylalanine as methyl ester (cationic surfactants) and free acid (amphoteric surfactants) derivatives have
been prepared by synthetic methods. Fundamental surfactant properties and antimicrobial activity have been evaluated.
The properties of these compounds have been compared to the properties of the monomer derivatives Nα-lauroyl-arginine methyl ester (cationic) and Nα-lauroyl-arginine (amphoteric). These new molecules are very soluble in water, good surfactants, and exhibit a good antimicrobial
activity, independently of their ionic character. 相似文献
13.
A. Pinazo M. Diz C. Solans M. A. Pés P. Erra M. R. Infante 《Journal of the American Oil Chemists' Society》1993,70(1):37-42
Two new cationic surfactants containing a disulfide bond were synthesized, and the physical chemical characteristics and the
fundamental surface-active properties were determined. These new surfactants have potential applications in the textile and
cosmetic field. These compounds have been prepared by condensation of a commercial Nα,Nα-dimethyl amino betaine with cystine dimethyl ester or cystamine by means of the mixed anhydride method. The study of their
properties revealed that these molecules are soluble in water (stable at pH⩽8) and show surface activity with similar low
critical micelle concentration values. Microscopic examination of water/surfactant systems containing these compounds shows
that they form liquid crystals with patterns corresponding to typical hexagonal and lamellar structures. 相似文献
14.
Synthesis and Evaluation of Bis-quaternary-Based Surfactants as Additives for Water-Based Mud 下载免费PDF全文
Sahar M. Ahmed Mona M. Dardir Dalia E. Mohamed Ashgan I. Awad 《Journal of surfactants and detergents》2016,19(6):1263-1272
Two series of cationic gemini surfactants, alkanediyl-α,ω-bis[N,N-dimethyl alkyl (octyl or dodecyl)ammonium] dibromide (R-s-R; s = 6, 10, 12 and R = 8 and 12) were prepared and evaluated as additives for water-based mud. The chemical structures of the prepared surfactants were confirmed using FTIR and mass spectroscopy. Surface activity of these compounds has been studied and their surface properties including surface tension, emulsification power, critical micelle concentration, effectiveness, maximum surface excess and minimum surface area were determined. The results showed that the prepared compounds have significant surface activity, especially those of longer hydrophobic chain length. The prepared cationic gemini surfactants were evaluated as viscosifiers and filter loss additives for water-based mud formulated from local Na-montmorillonite clay. XRD analysis was carried out to the Na-montmorillonite clay to determine the interaction of the surfactants with inter layers of the clay structure. Rheological properties, gel strength, thixotropy, filtration properties and the effect of temperature on rheological properties of the water-based mud were studied. The results indicated that the gemini surfactants have a positive effect on the rheological and filtration properties of the Na-montmorillonite clay according to American Petroleum Institute specifications. 相似文献
15.
Anant K. Ghumare Balu V. Pawar Sunil S. Bhagwat 《Journal of surfactants and detergents》2013,16(1):85-93
A series of novel cationic gemini surfactants were synthesized from corresponding amido-amines in a single step reaction. The amido-amines were obtained from long chain carboxylic acids and 3-N,N-dimethylamino-1-propyl-amine with excellent isolated yield (up to 95 %). All the synthesized quaternary ammonium compounds (QACs) were further investigated for surface active properties. The critical micelle concentration (CMC) and the effectiveness of surface tension reduction were determined. The surface tension measurements of newly synthesized gemini surfactants showed good water solubility, and low CMC values, had great efficiency in lowering the surface tension and a strong adsorption at the air/water interface than the corresponding monomeric surfactants. Further, the antibacterial activity of the synthesized QACs against both Gram-positive and Gram-negative bacteria was also investigated. 相似文献
16.
Preparation,surface-active properties,and antimicrobial activities of bis-quaternary ammonium salts from amines and epichlorohydrin 总被引:1,自引:1,他引:1
A series of new cationic surfactants, bis-quaternary ammonium salts, were prepared from tert-alkylamine and a product of the reaction of epichlorohydrin with decyl- and dodecylamine, and their surface-active properties
were measured. Specifically, the critical micelle concentration (CMC), effectiveness of surface tension reduction (γCMC), surface excess concentration (Γ), area per molecule at the interface (A), and standard free energies of adsorption (ΔG
ads
o) and of micellization (ΔG
mic
o) were determined. All these surfactants showed good water solubility and low CMC, more than one order of magnitude lower
than those of corresponding mono-alkylammonium salts. They also showed good foaming properties but worse wetting capabilities.
Many of these compounds had antimicrobial activities against gram-positive bacteria (Staphylococcus aureus, Bacillus subtilis) and yeast (Candida albicans), but they were not active against molds. 相似文献
17.
Three fluorinated cationic surfactants were prepared by condensing N-(2-bromoethyl)perfluoroalkylamides with stoichiometric amounts of pyridine, triethanolamine, and triethylamine to produce
three quaternary ammonium salts. The surface and biocidal properties of these surfactants were investigated to find the relation
between the structure of the hydrophilic portion of the compounds and their efficiency as biocides. The properties studied
included critical micelle concentration (CMC), effectiveness (IICMC), surface excess concentration (Tmax), and area occupied by a molecule (Amin). Free energies of micellization (ΔG
mic
o) and adsorption (ΔG
ads
o) of the surfactants in aqueous solution were calculated. The minimal inhibitory concentrations of the prepared compounds
were tested against five strains as representative group of microorganisms. 相似文献
18.
Victoria G. Sánchez Claudio J. Giudici Amilcar R. Bassi Marcelo C. Murguía 《Journal of surfactants and detergents》2012,15(4):463-470
A novel series of cationic dimeric surfactants was prepared involving the ketalization reaction, Williamson etherification, and regioselective oxirane ring opening with tertiary alkyl amines. The synthesized compounds were obtained in high purity by a simple purification procedure using column chromatography. The critical micelle concentration (CMC), effectiveness of surface tension reduction (??CMC), surface excess concentration (??), and area per molecule at the interface (A) were determined and values indicate that the cationic series is characterized by good surface-active and self-aggregation properties. For the first time, we reported the anthelmintic activities against the rodent gastrointestinal nematode Heligmosomoides polygyrus bakeri, in vitro for cationic gemini compounds. In the series of five tested cationic compounds (4a?Ce), three of them (4a, 4b and 4d) were shown to have an excellent anthelmintic activity in vitro at different concentrations. The anthelmintic activity was found to be dependent on the type of cationic compound, concentration and incubation time. The cationic di-C12 (4a) derivate of the series was the best anthelmintic agent, its use was optimal at a minimum concentration of 50?ppm and with 60?min of incubation. 相似文献
19.
M. Z. Mohamed 《Journal of surfactants and detergents》2008,11(2):175-179
Four fluorinated cationic surfactants were prepared by condensing 2,2,3,3, tetrafluoro-1-propyl chloroacetate with stoichiometric
amounts of pyridine, 2-hydroxypyridine, 8-hydroxyquinoline and 8-hydroxyquinaldine to produce four quaternary ammonium salts.
The surface and biocidal properties of these surfactants were investigated. Surface properties of their solutions including
surface tension, critical micelle concentration (CMC), effectiveness (Πcmc), maximum surface excess (Γmax) and minimum surface area (A
min) were investigated with respect to different concentrations at 25 °C. Standard free energies of micellization and adsorption
of the prepared surfactants in the aqueous solution were studied. The biocidal activity was determined via the inhibition
zone diameter of prepared compounds which tested against six strains as a representative group of microorganisms.
相似文献
M. Z. MohamedEmail: |
20.
Preparation,Characterization and Properties of Novel Cationic Gemini Surfactants with Rigid Amido Spacer Groups 下载免费PDF全文
Dongqing Xu Banghua Qi Di Fang Xuemei Zhang Ting Zhang 《Journal of surfactants and detergents》2016,19(1):91-99
A series of novel cationic gemini surfactants with rigid amido groups inserted as the spacers, named C 12 ‐PPDA‐C 12 , C 14 ‐PPDA‐C 14 and C 16 ‐PPDA‐C 16 , were synthesized by a two‐step reaction with dimethyl terephthalate, N,N‐dimethyl propylene diamine and alkyl bromide as raw materials. The chemical structures of the prepared compounds were confirmed by IR, 1H and 13C NMR and element analysis. Surface activity properties of the synthesized compounds were investigated by surface tension, electrical conductivity and fluorescence. Increasing the number of carbon atoms in the hydrophobic alkyl chain, decreased the critical micelle concentration (CMC), surface tension at the CMC and the minimum surface area. Other relevant properties including foaming ability and emulsion stability were investigated. The results indicated that the synthesized gemini surfactants possess good surface properties, emulsifying properties and steady foam properties. 相似文献