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1.
Saliha Alehyen Fatima Bensajjay Mohammed El Achouri Lourdes Pérez Aurora Pinazo María Rosa Infante 《Journal of surfactants and detergents》2010,13(3):339-348
A new oligomeric surfactant: N,N,N′,N″,N″- pentamethyl diethyleneamine—N,N″-di-[tetradecylammonium bromide] referred to as 14-2-N(CH3)-2-14 was synthesized, purified and characterized by Elemental Analysis, 1H and 13C NMR and Electrospray. The micellar properties of this compound were determined by electrical conductivity and surface tension
methods. Optical microscopy was also employed to study the behavior of anhydrous surfactant and the binary water/surfactant
system as a function of temperature. The critical micellar concentration (cmc), degree of counterion binding and thermodynamic
parameters of micellization (standard molar Gibbs energy, enthalpy and entropy of micellization) were determined by electrical
conductivity measurements in the temperature range [24–54 °C]. Surface tension measurements also provide information about
the dependence of the surface tension at the cmc (γcmc), pC20 (negative logarithm of the surfactant’s molar concentration C20, required to reduce the surface tension by 20 mN/m, the surface excess (Γmax) at air/solution interface, the minimum area per surfactant molecule at the air/solution interface (Amin), surface pressure
at the cmc (Пcmc), critical packing parameter(CPP) and the standard free energies of micellization (
\Updelta Gm0\Updelta G_{m}^{0}) and of adsorption (
\Updelta G\textads0 \Updelta G_{\text{ads}}^{0} ). 相似文献
2.
Three fluorinated cationic surfactants were prepared by condensing N-methyl diethanol amine pentafluoro benzoate with stoichiometric amounts of octyl, dodecyl or hexadecyl bromide. The surface
properties and parameters were investigated to find the relationship between the structures of the hydrophobic portion of
such compounds. The properties studied include surface tension, critical micelle concentration (CMC), effectiveness (Πcmc), maximum surface excess (Γmax) and minimum surface area (Amin) 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 values of Γmax, standard free energies of micellization
\Updelta \textG\textmic\texto \Updelta {\text{G}}_{\text{mic}}^{\text{o}} and adsorption
\Updelta \textG\textads\texto \Updelta {\text{G}}_{\text{ads}}^{\text{o}} were found to increase with the chain length, while the cmc and minimum surface area occupied by one molecule Amin were found to decrease. The biocidal activity was determined through the inhibition zone diameter of prepared compounds which
were measured against five strains of a representative group of microorganisms. 相似文献
3.
The micellization of an anionic gemini surfactant, (CH2)2[N(COC11H23)CH(CO2H)CH2(CO2H)]2·2NaOH, abbreviated as GA, having N,N-dialkylamide, carboxyl, and carboxylate groups, in aqueous solutions of NaCl at pH 5.0 was investigated by means of surface
tension and of fluorescence, using pyrene as a probe. The l
1/l
3 vs. log surfactant molar concentration (C) plots showed two values of critical micelle concentration (cmc). Of the two values,
the higher cmc value was close to that measured by the surface tension method, meaning that the lower cmc value may be caused
by the formation of small, non-surface-active soluble premicellar aggregates. Evidence for the existence of these premicellar
aggregates includes the fact that the lower of the two cmc values for GA was not observed in the l
1/l
3 vs. log C plots for (CH2)2[N(COC11H23)CH2CH2CO2Na]2, abbreviated as 212, in 0.001–0.3 M NaCl at pH 11.0, since the only cmc value obtained was close to that from surface tension
data. Plots of log molar concentration of Na+ in the solutions vs. log cmc, or Corrin-Harkins plots, revealed that the lower cmc values decrease with an increase in Na+ concentration, and when [Na+]=1 M, the values reach the decreasing higher cmc value. This means two mechanisms of GA aggregation
occured in at the same aqueous solutions of NaCl. In the first one, “monomeric form” → “micelle I” → “micelle II,” and in
the second, “monomeric form” → premicelle → micelle II.” The degree of micelle ionization, or β, for the higher cmc values
is 0.97 at 10−2 M≦[Na+]≦0.1 M. This large β value indicates that the GA molecules, as a result of the structural characteristic attributable to
the simultaneous presence of N,N-dialkylamide and carboxylate groups in the molecule, may be almost fully dissociated even at the cmc. The β value for the
lower cmc is 0.75. This indicates that the existence of a non-monomeric state at concentrations below the cmc determined from
surface tension data, which is additional evidence for the premicellar aggregation. 相似文献
4.
A novel zwitterionic imidazolium-based ionic liquid (IL) surfactant, 1-carboxymethyl-3-dodecylimidazolium inner salt, was
synthesized. The molecule structure was confirmed by means of electrospray ionization mass spectrometry, 1H nuclear magnetic resonance and elemental analysis. The isoelectric point (pI) is 3.8 ± 0.1 at 35 ± 0.1 °C. The other important
physicochemical parameters such as the critical micelle concentration (CMC), the surface tension at CMC (γCMC), the adsorption efficiency (pC
20), the surface pressure at CMC (ΠCMC), the maximum surface excess (Γm), the minimum molecular cross-sectional area (A
min), the value of CMC/C
20 and the average number of aggregation (N
m) were determined by surface tension and steady-state fluorescence probe methods, respectively. 相似文献
5.
Measurements of the surface tension of aqueous solution of mixtures of sodium dodecyl sulfate (SDDS) with methanol and ethanol
in SDDS concentration range from 10−5 to 10−2 M and mixtures of sodium hexadecyl sulfonate (SHS) with methanol and ethanol at SHS concentration from 10−5 to 8 × 10−4 M and for methanol and ethanol from 0 to 21.1 and, 11.97 M, respectively, were carried out at 293 K. Moreover, the surface
tension of aqueous solution mixtures of SDDS with propanol in the concentration range from 0 to 6.67 M taken from the literature
was also considered. The results obtained indicate that it is possible to describe the relationship between the surface tension
and molar concentration or molar fraction of alcohol by Szyszkowski and Connors equations. However, the Fainerman and Miller
equation allows us to predict the isotherm of the surfactant tension at constant anionic surfactants concentration at which
their molecules are present in the solution in the monomeric form if the molar area of surfactants and alcohols can be determined.
Based on the surface tension isotherms, the Gibbs surface excess of anionic surfactants and alcohols concentration at water–air
interface was determined and then recalculated for Guggenheim-Adam surface excess concentration of these substrates, and next
the molar fraction of alcohols and surfactants in the surface layer was determined. These molar fractions were discussed with
regard to surfactant and alcohol standard free energy of adsorption at the water–air interface determined from Langmuir and
Aronson and Rosen equations. The standard free energy of adsorption determined in these ways was compared to that deduced
on the basis of pC20 and Lifshitz van der Waals-components of the anionic surfactant and alcohol tails. 相似文献
6.
Deepti Tikariha Birendra Kumar Namrata Singh Kallol K. Ghosh Pierluigi Quagliotto 《Journal of surfactants and detergents》2011,14(4):555-562
The micellization behavior of gemini surfactants i.e. alkanediyl-α,ω-bis(cetyldimethylammonium bromide) (C16-s-C16,2Br− where s = 3, 4, 10) in 10% (v/v) ethylene glycol solution was investigated by surface tension and conductometric measurements at
300 K. The critical micelle concentration, degree of micellar ionization, surface excess concentration, minimum surface area
per molecule of surfactant, surface pressure at the CMC and Gibbs energy of adsorption of the dimeric surfactants have also
been determined in the presence of different salts (NaCl, NaBr and NaI). The critical micelle concentration and degree of
micellar ionization values decrease significantly in the presence of sodium halides and follows the sequence NaCl < NaBr < NaI.
The free energy, enthalpy and entropy of micellization of dimeric surfactants in 10% (v/v) ethylene glycol solution were determined
using the temperature dependence of the critical micelle concentration. The standard free energy of micellization was found
to be negative in all the cases. 相似文献
7.
Toshikazu Takata Ichiro Atobe Naoya Kitamura Takeshi Endo 《Journal of the American Oil Chemists' Society》1990,67(11):739-742
Linear alkanes with two pyrrolidone groups in both termini [abbreviation: 1,n-dipyrrolidonyl alkane (1,n-DPA) (n=3, 5, 9,
and 12)] were synthesized. Their surface activities were evaluated in terms of surface tension, and compared with those of
a few kinds of surfactants. Among 1,n-DPAs, 1,3-, 1,5-, and 1,9-DPAs were fully soluble in water and surface-active: especially
1,9-DPA showed a surface tension value of γW/A 32.8 mN/m at 5.9×10−2 mol/L or 1.7 wt% and was suggested as a nonionic surfactant with simple structure and moderate activity. Critical miceller
concentration (CMC) of 1,9-DPA was 1.45×10−2 mol/L. Surface tension values of 1,5- and 1,9-DPAs were lower than those of the corresponding monofunctional pyrrolidones,
N-propyl and N-pentylpyrrolidones. Minimum area per surfactant molecule (Amin) decreased with increase of methylene chain length in the series of 1,n-DPAs. The results suggested that 1,n-DPA favorably
chooses a loop structure at air/water interface. 相似文献
8.
The unrecovered hydraulic fracturing fluid will invade the matrix and induce water blockage, creating formation damage and hindering the oil or gas production rate. First, the synergistic effect of cationic Gemini surfactant (MQAS) and nonionic fluorosurfactant (N-2821) mixtures on reducing the surface tension and wettability alteration was investigated in this paper. The critical micelle concentration (CMC) of the surfactant mixture is one or two orders of magnitude lower than that of N-2821 and MQAS, indicating that the MQAS/N-2821 mixtures exhibit an apparent synergistic effect in reducing surface tension. Moreover, the maximal contact angle of MQAS/N-2821 mixtures reached 83.55° at αN-2821 = 0.5, and the total surfactant concentration of 1 × 10−4 mol/L due to the adsorption of surfactant. The adsorption mechanism of surfactants on the surface of quartz sand was then examined. The adsorption kinetics is consistent with the pseudo-second-order model at different surfactant concentrations, while the Freundlich model is suitable for describing the adsorption behavior of surfactants on the sandstone surface. This finding indicates that surfactant adsorption is multilayered. The MQAS/N-2821 surfactant mixtures have excellent surfactant activity due to the relationship of the capillary pressure to the surface tension, pore radius, and contact angle; thus, the addition of surfactant mixtures can reduce the liquid saturation effectively. Furthermore, the sequential imbibition experiments indicate that MQAS/N-2821 mixtures alter the wettability of the core plug, which results from the adsorption of surfactants. Compared with brine water, the MQAS/N-2821 mixtures decreased the liquid saturation and increased the permeability recovery ratios of the core plug. 相似文献
9.
Synthesis and Characterization of Sodium Nonylphenol Ethoxylate(10) Sulfoitaconate Esters 总被引:1,自引:0,他引:1
Junwei Ding Bin Song Chuanxing Wang Jun Xu Yumin Wu 《Journal of surfactants and detergents》2011,14(1):43-49
Two sodium nonylphenol ethoxylate(10) sulfoitaconate ester surfactants, namely disodium nonylphenol ethoxylate(10) sulfoitaconate
monoester (DNE(10)SIM) and sodium nonylphenol ethoxylate(10) sulfoitaconate diester (SNE(10)SID), were synthesized through
the esterification and sulfonation reactions with nonylphenol ethoxylate(10) ester, itaconic acid and sodium sulfite as the
raw materials. The chemical structures of the prepared surfactants were confirmed by FTIR and 1H NMR. The surface tension of the synthesized surfactants was measured at 25 °C and the surface active properties were characterized.
The DNE(10)SIM had better surface activity. The CMC was 1.77 × 10−6 mol L−1 and γCMC was 35.45 mN m−1. The CMC and γCMC for the SNE(10)SID were 5.42 × 10−5 mol L−1 and 37.67 mN m−1, respectively. Moreover, the emulsification power of SNE(10)SID was better. 相似文献
10.
Pristine activated carbon (AcC) was oxidized by H2O2 under ultrasonic conditions. Compared with pristine AcC, the H2O2-oxidized AC possesses higher accumulation ability to trace levels of Cd2+. Based on this, a highly sensitive, simple and rapid electrochemical method was developed for the determination of Cd2+. In 0.01 mol L−1 HClO4 solution, Cd2+ was effectively accumulated at the surface of H2O2-oxidized AcC modified paste electrode, and then reduced to Cd under −1.10 V. During the following potential sweep from −1.10
to −0.50 V, reduced Cd was oxidized and a sensitive stripping peak appears at −0.77 V. The stripping peak current of Cd2+ changes linearly with concentration over the range 5.0 × 10−8 to 5.0 × 10−6 mol L−1. The limit of detection was found to be 3.0 × 10−8 mol L−1 for 2-min accumulation. Finally, this new sensing method was successfully used to detect Cd2+ in waste water samples. 相似文献
11.
Mohamed Aoudia Zuleihka Al-Harthi Rashid S. Al-Maamari Christie Lee Paul Berger 《Journal of surfactants and detergents》2010,13(3):233-242
The effect of surfactant concentration on the occurrence and detection of transient ultralow interfacial tension (IFT) between
crude oil and formation water at 75 °C has been investigated using a series of novel sodium alkyl ether sulfonates having
various increasing molecular weights and degrees of ethoxylation. All surfactant systems displayed dynamic interfacial tension
(DIT). Transient ultralow DIT (DITmin) were detected only within an intermediate surfactant concentration. This behavior was attributed to an implicit concentration-related
length scale required for the added surfactant to diffuse from the bulk phase to the freshly prepared oil–water interface.
In the high surfactant concentration range, this length scale is relatively short and results in an instantaneous (and undetectable)
occurrence of DITmim in a relatively very short time scale, well beyond the detection limit of the spinning drop tensiometer (~2–3 min). Interestingly,
DITmin were detected only in systems above the surfactant’s critical micelle concentration, suggesting that DITmin occurs as a result of the diffusion (subsequent to the adsorption) of the oil acidic species from the interface to the bulk
phase to form mixed micelles with the added surfactant. Measurements of DITs in the presence of decane showed no evidence
for DITmin, confirming the general belief that DITmin is indeed due to the interaction of the added surfactant with the oil acidic components. Finally, the effect of surfactant
concentration on the equilibrium IFT (γeq) showed evidence for relatively low values (~10−2 mNm−1) for some surfactant systems. 相似文献
12.
A series of cleavable aryl sulfonate anionic surfactants were synthesized from cyanuric chloride, aliphatic amine and H-acid
mono sodium salt. Their structures were identified by 1H NMR, Infrared Spectrum (IR) and Elementary Analysis (EA). Their critical micelle concentrations (CMC) in aqueous solutions
at 25 °C were determined by a steady-state fluorescence probe method and a surface-tension method. With the increasing length
of the carbon chain, the value of their CMCs and surface tensions under CMC (γ
CMC) initially decreased and then reached a minimum (respectively 2.63 × 10−5 mol L−1 and 28.29 mN m−1) when the carbon number was 10. The CMC and γ
CMC then increased when the carbon number was increased to 12. The results showed that, compared with sodium dodecyl benzene
sulfonate (SDBS), such kinds of surfactants have much lower surface adsorption amounts and greater molecular areas on the
aqueous surface.
相似文献
Zhiyong HuEmail: |
13.
Amal A. Hafiz A. M. Badawi F. I. El-Deeb E. A. Soliman M. Y. El-Awady D. E. Mohamed 《Journal of surfactants and detergents》2010,13(2):165-172
A novel series of ferrocenyl surfactants was synthesized by the reaction of ferrocene disulfonic acid with different primary
and tertiary fatty amines to produce the corresponding ammonium salts Fc[SO3
−
+NH3(CH2)
n
CH3]2, where n = 9, 11, or 15 and Fc[SO3− +NH(CH3)2(CH2)
n
CH3]2, where n = 7 or 11, respectively, and where Fc = ferrocene. Chemical structures were confirmed by microelemental analysis, FTIR, and
1H NMR spectroscopy. The critical micelle concentration of each prepared surfactant was determined using equilibrium surface
tension. Furthermore, air/water interface parameters including effectiveness (π
CMC), efficiency (Pc20), maximum surface excess (Гmax), and minimum surface area (A
min) were determined at 30, 40, and 50 °C. Thermodynamic parameters (ΔG°, ΔS°, and ΔH°) for both micellization and adsorption processes were recorded. The new synthesized surfactants were screened as antimicrobial
agents against different bacterial and fungal organisms. 相似文献
14.
Andrzej Piasecki Dorota Piłakowska-Pietras Anna Baran Anna Krasowska 《Journal of surfactants and detergents》2008,11(3):187-194
A homologous series of surface active 2-(alkanoylamino)ethyldimethylamine-N-oxides, EDA-p(O), and 3-(alkanoylamino)propyldimethylamine-N-oxides, PDA-p(O), were synthesized. Their aqueous stock solutions were processed by the automatically operating apparatus to remove surface-active
contamination and provide chemical purity at the air/water interface. In case of 3-(tetradecanoylamino)propyldimethylamine-N-oxide, PDA-14(O), the difference between equilibrium surface tension values of the purified surfactant solutions and the corresponding values
of the solutions prepared from the “as received” compounds amounts to 15 mN m−1. Moreover, in presence of the surface-active contaminants time needed to reach equilibrium surface tension values is over
2 h. For the solution of the “surface-chemically pure” grade the change of the surface tension within adsorption time is negligible
and the equilibrium is reached instantaneously. Physicochemical properties of obtained surface-chemically pure aqueous solutions
of N-oxides of alkylamidoamines and adsorption parameters (standard free energy of adsorption, ΔG°ads, surface excess by saturation surface concentration, Γ∞, minimum surface area demand per molecule adsorbed, A
min) were evaluated from the equilibrium surface tension versus concentration isotherms at the air/water interface using Gibbs’s
equation. The introduction of the CH2 moiety into the intermediate part of molecule causes a slight decrease of the hydrophobic character of surfactant. Also the
minimum surface area demand, A
min, is slightly greater for PDA series than for the corresponding EDA derivatives. Surface potential measurements were performed in addition to surface tension studies. Electric surface potential
versus concentration isotherms was determined. Surface potential increases with increasing surfactant’s bulk concentration
for all investigated compounds. At highest concentrations, where interface is almost saturated, changes of surface potential
become almost negligible.
相似文献
Andrzej PiaseckiEmail: |
15.
Zhongni Wang 《Journal of surfactants and detergents》2010,13(1):97-102
Surface tensions were determined for a mixture of an anionic fluorinated surfactant and a PEO-PPO-PEO triblock copolymer.
The interactions between the two surfactant molecules in the mixed monolayer and the mixed micelle were studied through molecular
interaction parameters (β
σ, β
M) and the molecule exchange energy (ε, ε
m). It was noted that synergism and strong attractive interactions took place between the anionic fluorinated surfactant and
the triblock copolymer molecules in both mixed micelles and mixed monolayers, reflected by the interaction parameter values
of between −10 and −18 for all mixtures investigated. Moreover, it can be seen from the value of (ε − ε
m) that when the mixture has a small amount of triblock copolymer, the formation of mixed micelle results in a greater decrease
in energy than does the formation of a mixed monolayer. With an increase in the mole fraction of the triblock copolymer in
the mixture, in order to obtain the lowest surface energy, surfactants tend to form mixed monolayers first, and then form
mixed micelles. 相似文献
16.
Titanium (IV) Phosphate copper hexacyanoferrate composite (TiPhCuHCF) was prepared using a new methodology for the synthesis.
A preliminary characterization of the precursor and resulting materials was defined using spectroscopic and chemical techniques.
The cyclic voltammogram of the modified electrode containing TiPhCuHCF exhibited two redox couples. The first and second redox
couples present a formal potential (E
θ′) of 0.18 and 0.76 V and were ascribed to the Cu+/Cu2+ (E
θ′)1 and Fe2+(CN)6/Fe3+(CN)6 (E
θ′)2 processes, respectively. In a preliminary study, the peak located at 0.76 V displays a sensitive response to N-acetylcysteine. The modified graphite paste electrode showed a linear range from 1.0 × 10−5 to 7.0 × 10−4 mol L−1 for the determination of N-acetylcysteine with a limit detection of 6.96 × 10−5 mol L−1 and relative standard deviation of ± 5% (n = 3) and amperometric sensitivity of 24.79 × 10−3 A mol L−1. The modified electrode was electrochemically stable and showed good reproducibility. 相似文献
17.
《Journal of Industrial and Engineering Chemistry》2014,20(6):4267-4275
A series of long chain water soluble cationics have been synthesized by using renewable raw materials like fatty alcohols and epichlorohydrin. The surface activity of the molecules has been determined by measurement of their conductance and surface tension in aqueous solution. The dynamics of surface activity of these surfactants have also been investigated in the presence of sodium halides, NaCl and NaBr by surface tension measurement. A series of useful parameters like critical micelle concentration (cmc), surface tension at the cmc (γcmc), adsorption efficiency (pC20), effectiveness of surface tension reduction (Πcmc), Gibbs free energy of the micellization (ΔG0 mic) and Gibbs free energy of adsorption (ΔG0 ads) have been determined from the measurements obtained by surface tension and conductivity method. Further with the application of the Gibbs adsorption isotherm, maximum surface excess concentration (θmax) and minimum surface area/molecule (Amin) at the air–water interface were also estimated. Thermal stability of these long chain cationics has been measured by thermal gravimetric analysis under nitrogen atmosphere. Analysis of thermal stability measurement indicated that the thermal stability of these long chain imidazoliums increase with an increase in chain length. 相似文献
18.
Synthesis and Properties of Novel Double-Tail Trisiloxane Surfactants with High Spreading Ability 总被引:1,自引:0,他引:1
A new type of double-tail trisiloxane surfactants of the general formula R1NR2CH2CH(OH)CH2O(CH2CH2O)xCH3 (x = 8.4, 12.9, 17.5, 22; R
1 = Me3SiOSiMe(CH2)3OSiMe3, R
2 = CH2CH(OH)CH2OR3, R
3 = CH2CH(C2H5)CH2(CH2)2CH3) has been synthesized by reacting single-tail trisiloxane surfactants with 2-ethylhexyl glycidyl ether. Their structures
were characterized with 1H-NMR and 13C-NMR spectroscopy. These double-tail trisiloxane surfactants reduce the surface tension of water to less than 24 mN/m at
a level of 10−5 mol/L. The spreading ability (SA) of the double-tail trisiloxane surfactant solution on Parafilm (or Ficus microcarpa leaf) surfaces is better than that on polyethylene terephthalate surface. The SA of the solution of the double-tail trisiloxane
surfactants 1J with average ethoxy units of 8.4 is far better than the others, and its solution (5.0 × 10−3 mol/L) possesses an SA value of over 15 within 10 min on Parafilm and Ficus microcarpa leaf surfaces. The surface tension values of aqueous solutions (1.0 × 10−3 mol/L) of the double-tail trisiloxane surfactants 1J are still less than 25 mN/m over 21 days in an acidic environment (pH 4.0) and 139 days in an alkaline environment (pH 10.0),
respectively. It is suggested that the SA and hydrolysis resistance of double-tail trisiloxane surfactants are able to be
improved by changing the structure of the hydrophobic group, such as increasing the molar ratio of methyl to methylene. 相似文献
19.
Relationship of structure to properties of surfactants. 16. Linear decyldiphenylether sulfonates 总被引:1,自引:0,他引:1
Milton J. Rosen Zhen Huo Zhu Xi Yuan Hua 《Journal of the American Oil Chemists' Society》1992,69(1):30-33
The properties of some well-characterized sodium linear decyldiphenylether (C10DPE)sulfonates have been studied. Among the properties investigated are dynamic and equilibrium surface tension, critical
micelle concentration (CMC), area per molecule at the aqueous solution/air interface, wetting time by the Draves technique,
foaming by the Ross-Miles method, solubilization, and hydrotropy. The decyldiphenylether moiety appears to be equivalent to
a terminally substituted straight alkyl chain of 16 carbon atoms. The trialkyl- and dialkyl-mono-sulfonates have solubilities
of < 0.01 g/dm3 in water, but are readily soluble in hexane. The didecyldiphenyl ether disulfonate (DADS) has a very low CMC value (1.0 ×
10−5 mol dm−3) in aqueous 0.1 N Na+ solution (NaCl), characteristic of surfactants with two hydrophilic and two hydrophobic groups. It also has a much larger
area per molecule at the aqueous solution/air interface than the monodecyldiphenyl-ether monosulfonate (MAMS) and a much higher
surface tension at the CMC. MAMS has a much lower surface tension at a surface age of 1 second (γ1s) than either DADS or the monodecyldiphenylether disulfonate (MADS). In agreement with γ1s and γeq values, wetting times increase in the order: MAMS < DADS < MADS and initial foam heights decrease in the order: MAMS > DADS
> MADS. Solubilization for three water-insoluble surfactants decreases in the order: DADS > MAMS > MADS, while hydrotropy
is most pronounced with the disulfonates. 相似文献
20.
Two series of quaternary cationic surfactant were synthesized by reaction of 8-hydroxyquinoline and 2-hydroxypyridine with
long chain alkyl halides (dodecyl, tetradecyl- and hexadecyl-bromide). Surface tension was measured in aqueous solution for
different concentrations at 25 °C. Various surface properties of the synthesized surfactants were evaluated, particularly
critical micelle concentration (CMC), efficiency (ΠCMC) as well as maximum surface excess (Γmax) and minimum surface area (A
min). Micellization and adsorption in liquid/air interfaces thermodynamics were investigated. The synthesized cationic surfactants
were evaluated for their biocidal activity. All compounds prepared showed good antibacterial and antifungal activities.
相似文献
Dina A. IsmailEmail: |