共查询到18条相似文献,搜索用时 328 毫秒
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测定了糖基双子阳离子表面活性剂(SGCS)与十二烷基硫酸钠(K_(12))复配体系的稳定性和表面性能。由实验结果可知,在宽的复配范围内不同碳链长度的SGCS与K_(12)均有良好的复配稳定性;C_(14)-SGCS/K_(12)复配体系表现出明显的协同增效作用,当n(C_(14)-SGCS)∶n(K_(12))为3∶5时复配溶液临界胶束浓度(cmc)、cmc时的表面张力(γ_(cmc))和降低表面张力的效率(pc_(20))分别为1.1×10~(-5) mol/L、23.69 mN/m和5.48,均明显优于C_(14)-SGCS和K_(12)自身的表面性能。 相似文献
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<正>阳离子表面活性剂具有某些特殊的性能(如抗静电、柔软和杀菌等功能),不能被其他类型的表面活性剂所取代,应用领域日趋广泛。进入21世纪,阳离子表面活性剂得到了更快的发展,其产 相似文献
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阳离子表面活性剂与LAS的复配性能研究 总被引:1,自引:0,他引:1
采用新开发的带有乙氧基链的含氮阳离子表面活性剂———十二烷基二甲基羟乙基氯化铵(K3)与LAS进行复配,考察了复配体系的物化性能,如:界面张力、乳化力、润湿力、去污力以及K3对大肠肝菌、金黄色葡萄球菌的杀菌性能等。实验证明K3与阴离子表面活性剂有良好的复配性能与杀菌性能,对洗涤剂配方的改进,产品性能的提高具有指导意义。 相似文献
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旨在筛选具有较好的水溶性、绿色环保、对植物病原菌具有较强杀菌性的杀菌剂。利用琼脂平板稀释法测定不同碳链长度的含吡啶杂环氯化铵(简称C8,C10,C12,C14,C16)阳离子表面活性剂对四种植物病原菌的离体杀菌活性,求出毒力回归方程,并计算有效抑菌浓度EC_(50)值。结果表明:碳链长度为12的含吡啶杂环氯化铵(C12)阳离子表面活性剂对水稻纹枯病原菌的EC_(50)=9.69×10~(-3)?g/L、对照药井岗霉素的EC_(50)=7.02×10~(-2)?g/L;对西瓜枯萎病原菌的EC_(50)=2.93×10~(-2)?g/L、对照药甲基布拖津的EC_(50)=0.506?g/L;对苹果腐烂病原菌的EC_(50)=1.57×10~(-5)?g/L、对照药苯醚甲环唑的EC_(50)=3.50×10~(-4)?g/L;对番茄灰霉病原菌的EC_(50)=1.85×10~(-4)?g/L、对照药菌恶唑的EC_(50)=2.04×10~(-3)?g/L。即C12对四种病原菌的EC_(50)值明显低于对照药剂,具有较好的杀菌活性,具有进一步研究的价值。通过相同试验方法进一步得到C12对四种病原菌的最小抑菌浓度(MIC)分别为0.094,0.091,0.083和0.087?g/L。为含吡啶杂环氯化铵阳离子表面活性剂对植物病原菌的防治研究提供依据。 相似文献
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Shengnan Guo Xiaowen Sun Qichao Zou Jinzhi Zhang Hong Ni 《Journal of surfactants and detergents》2014,17(6):1089-1097
A series of cationic gemini surfactants containing two dimethylalkylammonium chains linked by ethylene glycol bisacetyl spacers were synthesized [Gm‐AnA‐m, G = gemini surfactant, m = 12 (–C12H25), 14 (–C14H29), or 16 (–C16H33), A = acetyl, and n = 2, 3, or 4 is the number of ethylene glycol units in the spacers]. Because of the inductive effect of the oxygen atom in the spacer, acylation can take place using chloroacetyl chloride instead of bromoacetyl bromide which helps to limit the use of environmentally harmful reagents. Critical micelle concentrations were determined using conductivity measurements. The antibacterial activities of the surfactants against Gram‐positive bacterium Staphylococcus aureus and Gram‐negative bacterium Escherichia coli were evaluated from the minimum inhibitory concentration (MIC), minimum bacterial concentration, a time–kill study, and the inhibitory zone. Increasing the length of the spacer did not result in an obvious change of antibacterial activity. However, increasing the length of the alkyl chain apparently increased the antibacterial activity against S. aureus but decreased the antibacterial activity against E. coli. The G12‐A2A‐12 surfactant had the lowest CMC of 1.26 mmol L?1 and exhibited the best antibacterial activity with a MIC of 32 μg mL?1 toward S. aureus and 64 μg mL?1 toward E. coli in the presence of 105 CFU of bacteria. This work indicated that these cationic gemini surfactants have potential applications as antibacterial agents and emulsifiers. 相似文献
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Samy M. Shaban Atef Saied Salah M. Tawfik A. Abd-Elaal Ismail Aiad 《Journal of Industrial and Engineering Chemistry》2013,19(6):2004-2009
The three cationic surfactants based on Schiff base were laboratory prepared, (E)-decyl-4-[(2-hydroxyethylamino) methyl]-N,N-dimethyl benzenaminium bromide (I), (E)-dodecyl-4-[(2-hydroxyethylamino)methyl]-N,N-dimethyl benzenaminium bromide (II) and (E)-hexadecyl-4-[(2-hydroxyethylamino)methyl]-N,N-dimethyl benzenaminium bromide (III) were evaluated as corrosion inhibitors for carbon steel in acid medium and antimicrobial agents against sulfate reducing bacteria, SRB. Three techniques were used for the corrosion inhibition evaluation, namely; weight loss, polarization and electrochemical impedance. The serial dilution method was used to evaluate the inhibiting effect of these compounds on the sulfate reducing bacteria growth. The results showed that the prepared compounds have good antimicrobial activities against the SRB as well as they have high efficiency as corrosion inhibitors for carbon steel in 1 M HCl. 相似文献
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Ahmed Labena Ahmed Hamed Eman H. I. Ismael Samy M. Shaban 《Journal of surfactants and detergents》2020,23(5):991-1004
The Egyptian oil and gas industry is suffering from severe metal corrosion problems, particularly microbial-induced corrosion. There is limited knowledge on the corrosion inhibition of carbon steels in the presence of an acidophilic, iron-oxidizing bacterial species Acidithiobacillus ferrooxidans. Therefore, in this study, novel Gemini cationic surfactants, in three forms depending on variation in alkyl chains of 8, 12, and 16 carbon atoms named FHPAO, FHPAD, and FHPAH, respectively, were synthesized and characterized by Fourier transform infrared and nuclear magnetic resonance spectroscopy. The surface parameters and the thermodynamic of the synthesized surfactants were evaluated at three different temperatures, 20, 40, and 60 °C. The synthesized Gemini cationic surfactants were tested as broad-spectrum antimicrobial, antibacterial and anticandida agents. They evaluated as biocides and corrosion inhibitors against Acidithiobacillus ferrooxidans. FHPAD showed higher adsorption ability at the solution interface and higher affinity to construct micelles than FHPAO and FHPAH. Both adsorption and micellization processes were hydrophobic and temperature dependent. FHPAO, FHPAD and FHPAH exhibited wide-spectrum antimicrobial activities, and the highest activity and the lowest minimum bactericidal/fungicidal inhibitory concentrations were attributed to FHPAD. Furthermore, synthesized FHPAD demonstrated the highest metal corrosion inhibition efficiency of 95.5% at 5 mM in comparison to 87.5% and 81.7% for FHPAO and FHPAH, respectively. In conclusion, this study provides novel synthesized cationic surfactants with many applications in the oil and gas industry, such as broad-spectrum antimicrobial, biocides, and corrosion inhibitors for acidophilic, iron-oxidizing bacterial species Acidithiobacillus ferrooxidans. 相似文献
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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
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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
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A series of novel cationic gemini surfactants [CnH2n+1–O–CH2–CH(OH)–CH2–N+(CH3)2–(CH2)2]2·2Br? [ 3a (n = 12), 3b (n = 14) and 3c (n = 16)] having a 2‐hydroxy‐1,3‐oxypropylene group [?CH2–CH(OH)–CH2–O–] in the hydrophobic chain have been synthesized and characterized. Their water solubility, surface activity, foaming properties, and antibacterial activity have been examined. The critical micelle concentration (CMC) values of the novel cationic gemini surfactants are one to two orders of magnitude smaller than those of the corresponding monomeric surfactants. Furthermore, the novel cationic gemini surfactants have better water solubility and surface activity than the comparable [CnH2n+1–N+(CH3)2–(CH2)2]2·2Br? (n‐4‐n) geminis. The novel cationic gemini surfactants 3a and 3b also exhibit good foaming properties and show good antibacterial and antifungal activities. 相似文献
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Synthesis,Characterization, Surface and Biological Activity of Diquaternary Cationic Surfactants Containing Ester Linkage 下载免费PDF全文
M. A. Migahed N. A. Negm M. M. Shaban T. A. Ali A. A. Fadda 《Journal of surfactants and detergents》2016,19(1):119-128
Two series of diquaternary cationic surfactants designated as E9Nm and E11Nm having two different alkyl chains in their chemical structure were synthesized. The chemical structures of these surfactants were confirmed using elemental analysis, FTIR and 1H‐NMR spectra. The surface activities of the different surfactants were determined using surface and interfacial tension at 25 °C. The surface parameters including: critical micelle concentration, effectiveness, efficiency, maximum surface excess and minimum surface area were determined. The surface activities of the cationic surfactants were correlated with their chemical structure. The surface activities of the surfactants increased with increasing the hydrophobic chain length. The adsorption and micellization tendencies of the surfactants in solution were determined using the free energies of adsorption and micellization. The synthesized surfactants were evaluated as biocides against bacteria and fungi. Biocidal activity data showed that a gradual increase in the hydrophobic chain length of the surfactant molecules gradually increases the efficiency of these surfactants as biocides. 相似文献
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Ruijuan Wang Ruihua WanYan Shuo Yang Dong Wang Zhigang Yin 《Journal of surfactants and detergents》2020,23(4):697-703
A novel sugar-based Gemini surfactant with a N,N′-acetylethylenediamine spacer (N,N′ (N-dodecyl-2-D-glucosaminyl acetyl) ethylenediamine, Glu(12)-(AA)-Glu(12)), was synthesized with D-(+)-Glucono-1,5-lactone as starting material in three steps. The surfactant's structure was confirmed using 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and electrospray ionization mass spectrometry (ESI-MS). The aggregation behavior of Glu(12)-(AA)-Glu(12) in aqueous solution at pH 4.0, 7.0, and 10.0 was investigated by surface tension, dynamic light scattering (DLS), and cryogenic transmission electron microscopic (Cryo-TEM) measurements. The surface tension measurement shows that the critical micelle concentration (CMC) of Glu(12)-(AA)-Glu(12) is at the concentration level of 10−5 mol·L−1 at 25 °C, which is significantly lower than that of corresponding monomeric sugar-based surfactants. Compared with such sugar-based Gemini surfactants with similar hydrophilic spacers, Glu(12)-(AA)-Glu(12) demonstrated similar or slightly lower surface activity. The CMC value of Glu(12)-(AA)-Glu(12) underwent a slight decrease with the increase of pH. DLS and Cryo-TEM measurements reveal that Glu(12)-(AA)-Glu(12) forms micelles at acidic pH (pH 4.0) and the micelles are transformed into vesicles at neutral or high pH (pH 7.0, 10.0). The microstructural transformation of Glu(12)-(AA)-Glu(12) aggregates is related to the protonation state of its two tertiary amines in the head groups versus pH. 相似文献