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Journal articles on the topic 'Micellar catalysi'

Author: Grafiati

Published: 9 March 2023

Last updated: 19 July 2025

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1

Khan, Mohammad Niyaz, and Ibrahim Isah Fagge. "Kinetics and Mechanism of Cationic Micelle/Flexible Nanoparticle Catalysis: A Review." Progress in Reaction Kinetics and Mechanism 43, no. 1 (2018): 1–20. http://dx.doi.org/10.3184/146867818x15066862094905.

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The aqueous surfactant (Surf) solution at [Surf] > cmc (critical micelle concentration) contains flexible micelles/nanoparticles. These particles form a pseudophase of different shapes and sizes where the medium polarity decreases as the distance increases from the exterior region of the interface of the Surf/H2O particle towards its furthest interior region. Flexible nanoparticles (FNs) catalyse a variety of chemical and biochemical reactions. FN catalysis involves both positive catalysis ( i.e. rate increase) and negative catalysis ( i.e. rate decrease). This article describes the mechani

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2

Broxton, Trevor J. "Micellar Catalysis of Organic Reactions. XXXVIII A Study of the Catalytic Effect of Micelles of 3-Hydroxymethyl-1-tetradecylpyridinium Bromide on Amide Hydrolysis and Nucleophilic Aromatic Substitution." Australian Journal of Chemistry 51, no. 7 (1998): 541. http://dx.doi.org/10.1071/c98053.

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The preparation of 3-hydroxymethyl-1-tetradecylpyridinium bromide and its use as a catalyst of nucleophilic aromatic substitution and also amide hydrolysis are reported. It was found that the hydroxydehalogenation of nitro-activated aryl halides was much faster in these micelles than in the presence of cetyl(2-hydroxyethyl)dimethylammonium bromide. It was concluded that the increased catalysis of nucleophilic aromatic substitution by this micelle was due to a faster decomposition of the aryl micellar ether which must occur before the phenolate product is released. No such difference in the two

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3

Cibulka, Radek, Lenka Baxová, Hana Dvořáková, et al. "Catalytic effect of alloxazinium and isoalloxazinium salts on oxidation of sulfides with hydrogen peroxide in micellar media." Collection of Czechoslovak Chemical Communications 74, no. 6 (2009): 973–93. http://dx.doi.org/10.1135/cccc2009030.

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Three novel amphiphilic alloxazinium salts were prepared: 3-dodecyl-5-ethyl-7,8,10-trimethylisoalloxazinium perchlorate (1c), 1-dodecyl-5-ethyl-3-methylalloxazinium perchlorate (2b), and 3-dodecyl-5-ethyl-1-methylalloxazinium perchlorate (2c). Their catalytic activity in thioanisole (3) oxidation with hydrogen peroxide was investigated in micelles of sodium dodecylsulfate (SDS), hexadecyltrimethylammonium nitrate (CTANO3) and Brij 35. Reaction rates were strongly dependent on the catalyst structure, on the type of micelles, and on pH value. Alloxazinium salts 2 were more effective catalysts th

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4

Drennan, Catherine E., Rachelle J. Hughes, Vincent C. Reinsborough, and Oladega O. Soriyan. "Article." Canadian Journal of Chemistry 76, no. 2 (1998): 152–57. http://dx.doi.org/10.1139/v97-226.

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Kinetic studies through stopped-flow spectroscopy were undertaken in the dilute solution range of anionic surfactants where pronounced rate enhancement or inhibition of Ni2+-ligand complexations is often observed at surfactant concentrations much below the critical micelle concentration (CMC). The results are interpreted in terms of Ni-surfactant micelles as the agents responsible for the rate changes in dilute surfactant solution. At higher surfactant concentrations these micelles are transformed into mixed micelles (counterion and size changes), eventually becoming normal surfactant micelles

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5

Broxton, TJ, JR Christie, and RPT Chung. "Micellar Catalysis of Organic Reactions. XXVI. SNAr Reactions of Azide Ions." Australian Journal of Chemistry 42, no. 6 (1989): 855. http://dx.doi.org/10.1071/ch9890855.

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The azidodehalogenation of a number of aromatic compounds has been studied in the presence of micelles of cetyltrimethylammonium bromide (ctab). The variation of the observed rate of reaction with ctab concentration has been treated by using the model of Rodenas and Vera to determine the rate constant for reaction in the micellar pseudo-phase, k2m, the binding constant of the substrate to the micelle, Ks, and the nucleophile-micellar counter ion exchange constant KAzBr :. The ratio of the rate constants in the micellar pseudo-phase and in water varied between 0.9 and 52. For reactions involvin

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6

Steven, Alan. "Micelle-Mediated Chemistry in Water for the Synthesis of Drug Candidates." Synthesis 51, no. 13 (2019): 2632–47. http://dx.doi.org/10.1055/s-0037-1610714.

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Micellar reaction conditions, in a predominantly aqueous medium, have been developed for transformations commonly used by synthetic chemists working in the pharmaceutical industry to discover and develop drug candidates. The reactions covered in this review are the Suzuki–Miyaura, Miyaura borylation, Sonogashira coupling, transition-metal-catalysed CAr–N coupling, SNAr, amidation, and nitro reduction. Pharmaceutically relevant examples of these applications will be used to show how micellar conditions can offer advantages in yield, operational ease, amount of waste generated, transition-metal

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7

Oranli, Levent, Pratap Bahadur, and Gérard Riess. "Hydrodynamic studies on micellar solutions of styrene–butadiene block copolymers in selective solvents." Canadian Journal of Chemistry 63, no. 10 (1985): 2691–96. http://dx.doi.org/10.1139/v85-447.

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Hydrodynamic radius of micelles of several block copolymers in different selective solvents (for both types of blocks) was determined from photon correlation spectroscopy. The boundaries of micellar solutions in heptane (good solvent for polybutadiene block) and dimethylformamide (good solvent for polystyrene block) were established for polymers in terms of their molecular mass and block composition. The photon correlation spectroscopy data in combination with intrinsic viscosities of block copolymers in selective solvents were used to determine micellar molecular mass and aggregation number.

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8

Wasylishen, Roderick E., Jan C. T. Kwak, Zhisheng Gao, Elisabeth Verpoorte, J. Bruce MacDonald, and Ross M. Dickson. "NMR studies of hydrocarbons solubilized in aqueous micellar solutions." Canadian Journal of Chemistry 69, no. 5 (1991): 822–33. http://dx.doi.org/10.1139/v91-122.

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Information concerning the solubilization of hydrocarbons in ionic surfactant micelles was obtained from 2H NMR relaxation, 1H NMR chemical shifts, and 1H NMR paramagnetic relaxation measurements. The rotational motion of deuterated hydrocarbons, which is related to the micellar microviscosity at the location of the hydrocarbons, was probed by 2H NMR relaxation. The relaxation data are interpreted using both the two-step and the single-step models, and the results are discussed in terms of the micellar microviscosity and the location of the hydrocarbons in micelles. The location of the hydroca

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9

KALLOL, K. GHOSH, and K. SAR SANTOSH. "Kinetic Studies of Alkaline Hydrolysis of N-Phenylbenzohydroxamic Acid in the Presence of Micelles." Journal of Indian Chemical Society Vol. 72, Sep 1995 (1995): 597–601. https://doi.org/10.5281/zenodo.5909403.

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School of Studies in Chemistry, Pt. Ravishankar Shukla University. Raipur-492 010 <em>Manuscript received 14 September 1993, revised 4 January 1994, accepted 1 March 1994</em> The alkaline hydrolysis of <em>N</em>-phenylbenzohydroxamic acid has been studied under micellar (<em>k</em><sub>Ψ</sub>) and nonmicellar (<em>k</em><sub>w</sub>) conditions using cationic (cetyltrimethylammonium bromide, cetylpyridinium chloride), anionic (sodium lauryl sulphate), and non-ionic (Triton X-100) micellar agents. The results are explained by the pseudophase ion-exchange model. Both the cationic and anio

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10

Gebicka, Lidia, and Monika Jurgas-Grudzinska. "Activity and Stability of Catalase in Nonionic Micellar and Reverse Micellar Systems." Zeitschrift für Naturforschung C 59, no. 11-12 (2004): 887–91. http://dx.doi.org/10.1515/znc-2004-11-1220.

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Catalase activity and stability in the presence of simple micelles of Brij 35 and entrapped in reverse micelles of Brij 30 have been studied. The enzyme retains full activity in aqueous micellar solution of Brij 35. Catalase exhibits “superactivity” in reverse micelles composed of 0.1 ᴍ Brij 30 in dodecane, n-heptane or isooctane, and significantly lowers the activity in decaline. The incorporation of catalase into Brij 30 reverse micelles enhances its stability at 50 °C. However, the stability of catalase incubated at 37 °C in micellar and reverse micellar solutions is lower than that in homo

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11

Broxton, Trevor J., and Robin A. Coa. "Micellar catalysis of organic reactions. Part 33. Amide hydrolysis in neutral solution in the presence of a copper-containing micelle." Canadian Journal of Chemistry 71, no. 5 (1993): 670–73. http://dx.doi.org/10.1139/v93-090.

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The hydrolysis of 5-nitro-2-(trifluoroacetylamino)benzoic acid (1) has been studied at pH 7 in water and in the presence of micelles of cetyltrimethylammonium bromide (ctab) and of copper-containing micelles formed from the reaction of N,N,N′-trimethyl-N′-hexadecylethylenediamine and cupric chloride. It has been found that the hydrolysis of 1 is inhibited by micelles of ctab but strongly catalysed by the copper-containing micelle at this pH. At a higher pH where the hydroxide ion reaction becomes important the reaction is catalysed by micelles of ctab as well, but the catalysis is stronger by

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12

Venkateswaran, Krishnan, Mary V. Barnabas, Bill W. Ng, and David C. Walker. "Residence-time of muonium at micelles: Effect of added micelles on the reactivity of muonium towards ionic solutes in water." Canadian Journal of Chemistry 66, no. 8 (1988): 1979–83. http://dx.doi.org/10.1139/v88-319.

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The effective rate constant for the reaction of muonium with NO3−, S2O32−, and Tl+ ions in water is altered by the addition of micelles. There is a decrease when the charge on the micelle is the same as that of the solute and an increase when their charges are opposite. From the magnitude of the effect a mean residence-time for muonium of 2 ns has been deduced for dodecyl sulphate micelles. This suggests there is barely any preferred localization, because 2 ns is smaller, even, than the expected diffusion time if the micelle core is as viscous as reported. This use of muonium atoms to probe th

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13

Poša, Mihalj. "Self-Association of the Anion of 7-Oxodeoxycholic Acid (Bile Salt): How Secondary Micelles Are Formed." International Journal of Molecular Sciences 24, no. 14 (2023): 11853. http://dx.doi.org/10.3390/ijms241411853.

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Bile acid anions are steroidal biosurfactants that form primary micelles due to the hydrophobic effect. At higher concentrations of some bile acid anions, secondary micelles are formed; hydrogen bonds connect primary micelles. Monoketo derivatives of cholic acid, which have reduced membrane toxicity, are important for biopharmaceutical examinations. The main goal is to explain why the processes of formation of primary and secondary micelles are separated from each other, i.e., why secondary micelles do not form parallel to primary micelles. The association of the anion of 7-oxodeoxycholic acid

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14

Biasutti, M. A., and Juana J. Silber. "Interaction between tetracyanoethylene and naphthalene in reverse micelles of AOT in n-hexane. The electron-donor properties of AOT." Canadian Journal of Chemistry 74, no. 9 (1996): 1603–8. http://dx.doi.org/10.1139/v96-177.

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The electron donor–acceptor (EDA) interaction between TCNE and naphthalene (Naph) in n-hexane and reverse micelles of AOT in n-hexane was studied by UV–visible spectroscopy with the aim of determining the influence of the micellar media on the EDA interaction. The spectra of the mixtures of TCNE–Naph in n-hexane show two typical maxima at 418 and 534 nm, assigned to the formation of a π–π EDA complex. In the micellar media a new band is observed at 398 nm. When the spectra of TCNE in n-hexane are studied in the presence of AOT two new bands at 398 and 418 nm are detected. These bands are consi

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15

JAMES, Stephen R., Sheila SMITH, Andrew PATERSON, T. Kendall HARDEN та C. Peter DOWNES. "Time-dependent inhibition of phospholipase Cβ-catalysed phosphoinositide hydrolysis: a comparison of different assays". Biochemical Journal 314, № 3 (1996): 917–21. http://dx.doi.org/10.1042/bj3140917.

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The properties of three different β-isoforms of phospholipase C (PLC) were analysed using substrate lipids dispersed in phospholipid vesicles, phospholipid–detergent mixed micelles and phospholipid monolayers spread at an air–water interface. Phosphatidylinositol 4,5-bisphosphate hydrolysis went virtually to completion in monolayers, but inositol trisphosphate production was curtailed prematurely in vesicular and micellar assays. Assays were linear for less than 2 min with vesicles; the linear portion could be significantly extended in micelles by increasing the ratio of micelles to enzyme mol

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16

Favaro, Yvette L., and Vincent C. Reinsborough. "Micellar catalysis in mixed anionic/cationic surfactant systems." Canadian Journal of Chemistry 72, no. 12 (1994): 2443–46. http://dx.doi.org/10.1139/v94-310.

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Dye solubility and stopped-flow kinetic studies were conducted in sodium dodecylsulfate/dodecyltrimethylammonium bromide and sodium dodecylsulfate/decyltrimethylammonium bromide micellar solutions with excess anionic surfactant. The enhanced rate in the presence of anionic micelles of the Ni2+(aq)/pyridine-2-azo-p-dimethylaniline (PADA) complexation reaction was used as a probe of the mixed micellar situation. PADA solubilities and the kinetic parameters derived through the Robinson model for micellar catalysis were consistent with a complete incorporation of the cationic surfactant into the s

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17

MacInnis, Judith A., Greg D. Boucher, R. Palepu, and D. Gerrard Marangoni. "The properties of a family of two-headed surfactant systems: the 4-alkyl-3-sulfosuccinates 2. Surface properties of alkyl sulfosuccinate micelles." Canadian Journal of Chemistry 77, no. 3 (1999): 340–47. http://dx.doi.org/10.1139/v99-008.

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The micellar properties of a family of two-headed surfactants, the alkyl sulfosuccinates, were investigated employing fluorescence, ultra-violet spectroscopy, and acid-base titrations, as a function of the chain length of the surfactant. Polarity of the micellar interior was investigated using pyrene and the ionic probe 8-anilino-1-naphthalensulfonic acid ammonium salt (ANS). Pyrene I1/I3 ratios were used to probe the microenvironment of the probe in the palisade layer of the micelle. The pKa values of both of the anionic head groups were determined using acid-base titrations. Surface potentia

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18

Augustine, Rimesh, Dae-Kyoung Kim, Ho An Kim, Jae Ho Kim, and Il Kim. "Poly(N-isopropylacrylamide)-b-Poly(L-lysine)-b-Poly(L-histidine) Triblock Amphiphilic Copolymer Nanomicelles for Dual-Responsive Anticancer Drug Delivery." Journal of Nanoscience and Nanotechnology 20, no. 11 (2020): 6959–67. http://dx.doi.org/10.1166/jnn.2020.18822.

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A series of ABC triblock poly(N-isopropylacrylamide)75-block-poly(L-lysine)35-block-poly(L-histidine)n (p(NIPAM)75-b-p(Lys)35-b-p(His)N) (N = 35,50,75,100) copolymer bio-conjugates were prepared by combining reversible addition-fragmentation chain transfer polymerization and fast ring-opening polymerization of N-carboxyanhydride a-amino acid using 1,3-dicyclohexylimidazolium hydrogen carbonate as a catalyst. All the resulting triblock copolymers self-assembled into spherical micellar aggregates in aqueous solution, irrespective of the chain length of the histidine block. The micellar aggregate

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19

Connolly, Terrence J., and Vincent C. Reinsborough. "Micellar rate enhancement studies in mixed sodium fluorocarbon/hydrocarbon surfactant solutions." Canadian Journal of Chemistry 70, no. 6 (1992): 1581–85. http://dx.doi.org/10.1139/v92-194.

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Stopped-flow kinetic studies were conducted in mixed micellar solutions of fluorocarbon and hydrocarbon anionic surfactants to determine the prevalent micellar form. The probe reaction was the Niaq2+/pyridine-2-azo-p-dimethylaniline (PADA) complexation, which is many times accelerated in the presence of anionic micelles. Binding constants for Niaq2+ and PADA partitioning between bulk solution and micelles were determined through the murexide technique and solubility measurements respectively and the molar reaction volume was obtained from the Robinson equation. The three binary surfactant syst

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20

Barclay, Lawrence Ross Coates, Steven Jeffrey Locke, and Joseph Mark MacNeil. "Autoxidation in micelles. Synergism of vitamin C with lipid-soluble vitamin E and water-soluble Trolox." Canadian Journal of Chemistry 63, no. 2 (1985): 366–74. http://dx.doi.org/10.1139/v85-062.

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A study was made of the effect of the inhibitors ascorbic acid (C), α-tocopherol (E), and 6-hydroxy-2,5,7,8-tetramethyl-chroman-2-carboxylate (Trolox, T) on the autoxidation of linoleic acid in 0.50 M sodium dodecyl sulfate (SDS) micelles at pH 7.0 in phosphate buffer. Reactions were thermally initiated at 30 °C in the SDS micelles by a micelle-soluble initiator, di-tert-butylhyponitrite (DBHN). Although water-soluble C alone is an inefficient inhibitor, when combined with micelle-soluble E, it acts synergistically with the latter to extend the efficient antioxidant action of E beyond the sum

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21

Tee, Oswald S., and Alexei A. Fedortchenko. "Transition state stabilization by micelles: the hydrolysis of p-nitrophenyl alkanoates in cetyltrimethylammonium bromide micelles." Canadian Journal of Chemistry 75, no. 10 (1997): 1434–38. http://dx.doi.org/10.1139/v97-172.

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The cleavage of p-nitrophenyl alkanoates (acetate to octanoate) at high pH is modestly catalyzed by micelles formed from cetyltrimethylammonium bromide (CTAB) in aqueous solution. Rate constants exhibit saturation behaviour with respect to [CTAB], consistent with substrate binding in the micelles. The strength of substrate binding and transition state binding to the micelles increases monotonically with the acyl chain length, and with exactly the same sensitivity. As a result, the extent of acceleration (or catalytic ratio) is independent of the ester chain. These and earlier results are consi

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22

S., Radjarejesri, and C. Sarada N. "Kinetic studies on the reduction of dithiazone by sulphite ions in micellar media." Journal of Indian Chemical Society Vol. 84, June 2007 (2007): 554–58. https://doi.org/10.5281/zenodo.5820646.

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 Department of Chemistry, Sona College of Technology, Thiagarajar Polytechnic Road, Salem-636 005,  Tamilnadu, India E-mail: uma_vijay@mailcity.com School of Science & Humanities, Chemistry Division, VIT University, Vellore-632 014, Tamilnadu, India Centre for Bioseparation Technology (CBST), VIT University, Vellore-632 014, Tamilnadu, India <em>E-mail</em> : ncsarada@yahoo.com <em>Manuscript received 26 December 2006, accepted 28 March 2007</em> This study reveals the micellar effects on the rate of reduction of dithiazone, an azo compound by sulphite ions in a buffer medium of

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23

MacInnis, Judith A., R. Palepu, and D. Gerrard Marangoni. "A nuclear magnetic resonance investigation of the micellar properties of a series of sodium cyclohexylalkanoates." Canadian Journal of Chemistry 77, no. 11 (1999): 1994–2000. http://dx.doi.org/10.1139/v99-211.

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The micellar properties of a family of surfactants, the sodium cyclohexylalkanoates, have been investigated in aqueous solution using multinuclear NMR spectroscopy. C-13 chemical shift measurements have been used to determine both the cmc values and the micellar aggregation numbers (Ns values) of these surfactants. The cmc values and the degrees of counterion binding were estimated from 23Na chemical shift measurements. The critical micelle concentrations (cmc's) and the aggregation numbers determined from the NMR experiments indicate that these amphiphiles have high cmc's and low aggregation

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24

Greencorn, David J., Victoria M. Sandre, Emily K. Piggott, et al. "Asymmetric cationic gemini surfactants: an improved synthetic procedure and the micellar and surface properties of a homologous series in the presence of simple salts." Canadian Journal of Chemistry 96, no. 7 (2018): 672–80. http://dx.doi.org/10.1139/cjc-2017-0676.

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The micellar and morphological properties of symmetric, cationic gemini surfactants have been well studied in the literature as a function of nature and type of the spacer group and the length and type of hydrophobic chain. In this paper, we have examined the effects of tail asymmetry on the properties of a series of cationic surfactants, the N-alkyl-1-N′-alkyl-2-N,N,N′,N′-tetramethyldiammonium dibromide. A novel synthetic method is used to prepare a series of these surfactants and the consequences of asymmetry on micellar properties are presented. This new method has been shown to be more eff

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25

Stadlbauer, John M., Krishnan Venkateswaran, Hugh A. Gillis, Gerald B. Porter, and David C. Walker. "Micelle-induced change of mechanism in the reaction of muonium with acetone." Canadian Journal of Chemistry 74, no. 11 (1996): 1945–51. http://dx.doi.org/10.1139/v96-221.

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Muonium atoms add to the O atom of the carbonyl group of acetone to give the muonated free radical (CH3)2Ċ-O-Mu when the reaction takes place in water or hydrocarbons, but not when the acetone is localized in micelles. Micelles have no effect on the formation of muonated cyclohexadienyl radicals when muonium reacts with benzene under similar conditions. The addition reaction with acetone appears to have been subsumed by a faster alternative reaction in the micellar environment. Evidence is presented for this interpretation rather than for an inhibition of the radical or for a shift in the muon

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26

Márquez-Villa, José Martín, Juan Carlos Mateos-Díaz, Jorge A. Rodríguez, and Rosa María Camacho-Ruíz. "Lipase B from Candida antarctica in Highly Saline AOT-Water-Isooctane Reverse Micelle Systems for Enhanced Esterification Reaction." Catalysts 13, no. 3 (2023): 492. http://dx.doi.org/10.3390/catal13030492.

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Butyl oleate synthesis by the lipase B from Candida antarctica (CalB) under extreme halophilic conditions was investigated in the present research through the AOT/Water/Isooctane reverse micellar system. The impact of aqueous content (Wo=H2OSurfactant) and NaCl variation on the enzymatic activity of CalB in the butyl oleate reaction in reverse micelles was explored. The results indicated that, based on the increase of NaCl, it is remarkable to achieve higher enzymatic activity up to 444.85 μmolmin at 5 M NaCl and Wo = 10, as the best esterification conditions at pH 7.2 and 30 °C. However, it w

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Dahadha, Adnan A., Mohammed Hassan, Tamara Mfarej, et al. "The Catalytic Influence of Polymers and Surfactants on the Rate Constants of Reaction of Maltose with Cerium (IV) in Acidic Aqueous Medium." Journal of Chemistry 2022 (July 1, 2022): 1–11. http://dx.doi.org/10.1155/2022/2609478.

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Kinetics of the reaction of maltose with cerium ammonium sulfate were analyzed spectrophotometrically by observing the decrease of the absorbance of cerium (IV) at 385 nm in the presence and absence of polyethylene glycols (600, 1500, and 4000) and polyvinylpyrrolidone (PVP), in addition to anionic micelles of sodium dodecyl sulfate (SDS), cationic micelles of cetyltrimethylammonium bromide (CTAB) and non-ionic micelles of Tween 20 surfactants. Generally, there is little literature about using the polymers (PEGs and PVP) as catalysts in the oxidation-reduction reactions. Therefore, the major t

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Hétu, Daniel, and Jacques E. Desnoyers. "Volumes and heat capacities of transfer of ammonium salts from water to aqueous octyldimethylamine oxide at 25 °C." Canadian Journal of Chemistry 66, no. 4 (1988): 767–73. http://dx.doi.org/10.1139/v88-133.

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The effect of an additive on a water–surfactant system can be studied through thermodynamic functions of transfer of the additive from water to aqueous solutions of the surfactant. These thermodynamic functions often go through extrema in the region of the critical micellar concentration (cmc) of the surfactant. As it can be shown with a simple chemical equilibrium model, the general shape of the transfer functions is primarily related to the pair-wise hydrophobic interactions between the additive and the surfactant monomers, to a shift in the monomer–micelle equilibrium and to the distributio

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ul Haq, Naveed, Muhammad Usman, Ajaz Hussain, et al. "Partitioning of reactive yellow 86 between aqueous and micellar media studied by differential absorption spectroscopy." Canadian Journal of Chemistry 95, no. 6 (2017): 697–703. http://dx.doi.org/10.1139/cjc-2016-0442.

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The present study describes the partitioning of a reactive dye, reactive yellow 86, between aqueous and micellar media of a cationic surfactant (cetyltrimethyl ammonium bromide, CTAB), as well as an anionic surfactant (sodium dodecyl sulphate, SDS). In a systematic investigation, we have recorded the UV–vis absorption spectra of the dye as a function of surfactant’s concentration above and below the critical micelle concentration (CMC). Absorption spectra display a red shift in the case of CTAB and a hypochromic shift upon using SDS. The partition coefficient (Kx) was calculated using differen

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Hils, Christian, Ian Manners, Judith Schöbel, and Holger Schmalz. "Patchy Micelles with a Crystalline Core: Self-Assembly Concepts, Properties, and Applications." Polymers 13, no. 9 (2021): 1481. http://dx.doi.org/10.3390/polym13091481.

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Crystallization-driven self-assembly (CDSA) of block copolymers bearing one crystallizable block has emerged to be a powerful and highly relevant method for the production of one- and two-dimensional micellar assemblies with controlled length, shape, and corona chemistries. This gives access to a multitude of potential applications, from hierarchical self-assembly to complex superstructures, catalysis, sensing, nanomedicine, nanoelectronics, and surface functionalization. Related to these applications, patchy crystalline-core micelles, with their unique, nanometer-sized, alternating corona seg

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Mullally, Maria K., and D. Gerrard Marangoni. "Micellar properties of zwitterionic surfactant - alkoxyethanol mixed micelles." Canadian Journal of Chemistry 82, no. 7 (2004): 1223–29. http://dx.doi.org/10.1139/v04-022.

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The micelle formation process for a zwitterionic surfactant, N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (ZW3-12), has been investigated in a series of mixed solvents consisting of different concentrations of ethoxylated alcohols and polymers. The critical micelle concentrations (cmc values) of the aggregates were determined by fluorescence spectroscopy, and the surfactant aggregation numbers were obtained from luminescence probing experiments. The cmc values for ZW3-12 changed very little in the presence of increasing amounts of poly(ethyleneoxide) (PEO) in the mixed solvent. In the c

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Broxton, TJ. "Micellar Catalysis of Organic Reactions. XXXI. A Study of the Effects of Micelles of Cetyltrimethylammonium Bromide on Some SNAr Reactions in Aqueous Binary Mixtures." Australian Journal of Chemistry 44, no. 5 (1991): 667. http://dx.doi.org/10.1071/ch9910667.

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The effect of micelles of cetyltrimethylammonium bromide ( ctab ) on the SNAr reactions of 1-fluoro-2,4-dinitrobenzene (1), 2-fluoro-5-nitrobenzoate (2) and 4-fluoro-3-nitrobenzoate (3) with sodium hydroxide in aqueous binary mixtures with several alcohols has been studied. Two products were detected in all of these reactions: the phenol from reaction with hydroxide ions, and an aryl alkyl ether from reaction with the alkoxide ions. Micelles of ctab increased the percentage yield of the ether product at the expense of the phenol for compounds (1) and (2) in most of the binary mixtures used. Fo

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IONESCU, Lavinel G., Danil A. R. Rubio, and Elizabeth Fatima De Souza. "MICELLAR CATALYZED HYDROLYSIS OF LITHIUM p-NITROPHENYL ETHYL PHOSPHATE (LiPNEF) AND THE PSEUDO PHASE ION EXCHANGE MODEL." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 4, no. 4 (1996): 59–82. http://dx.doi.org/10.48141/sbjchem.v4.n4.1996.61_1996.pdf.

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The hydrolysis of lithium p-nitrophenyl ethyl phosphate (LiPNEF) was studied at 25°, 35°, and 45 °C by spectrophotometric techniques in the presence of micelles of cetyltrimethylammonium bromide (CTAB), sodium hydroxide, and salt. The concentration of NaOH used varied from 0,050 to 5,00 M and the NaCl ranged from 0,0050 to 0,030 M. Pseudo-first order rate constants (kw) and second-order rate constants (k2) and activation parameters such as Ea, ΔH≠, ΔG≠, and ΔS≠ were measured. The system was also studied by tensiometric, viscosity, and quasi-elastic light scattering methods. At low concentratio

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Boucher, Gregory D., Aaron C. MacDonald, Brent E. Hawrylak, and D. Gerrard Marangoni. "Article." Canadian Journal of Chemistry 76, no. 9 (1998): 1266–73. http://dx.doi.org/10.1139/v98-165.

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A family of two-headed surfactants, the disodium 4-alkyl-3-sulfonatosuccinates, has been synthesized by the monoesterification of maleic anhydride and the addition of sodium bisulfite to the corresponding monoester. The properties the micelles formed by these compounds in aqueous solution, and the conformations of the chains comprising the micellar interior, have been investigated using a combination of 1-D nmr experiments and homonuclear and heteronuclear 2-D nmr techniques. The critical micelle concentrations (cmc's) and the aggregation numbers determined from the nmr experiments indicate th

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35

Lunkim, Kimkholhing, M. Niraj Luwang, and Sri K. Srivastava. "Quantitative Analysis of Dye Decolourization Reactions in Mixed Micellar Systems of Sodium Dodecyl Sulfate with Tween-20, Tween-80, and Triton X-100." Australian Journal of Chemistry 65, no. 2 (2012): 153. http://dx.doi.org/10.1071/ch11454.

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The reaction of triphenylmethane dye (ethyl violet) with hydroxyl ion has been investigated in absence and presence of micelles. In micellar solutions, the solubilization of dye carbocation is observed. The reaction rate constant follows pseudo-first order kinetics with respect to the nucleophile. In presence of sodium dodecyl sulfate (SDS) micelles, an inhibitory effect is observed due to repulsion of the nucleophile to the strongly bound dye carbocation in the negatively charged SDS aggregate. The presence of nonionic surfactant reduces the inhibitory effect of the anionic SDS micelles. Quan

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36

Tang, Christina, and Bridget T. McInnes. "Cascade Processes with Micellar Reaction Media: Recent Advances and Future Directions." Molecules 27, no. 17 (2022): 5611. http://dx.doi.org/10.3390/molecules27175611.

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Reducing the use of solvents is an important aim of green chemistry. Using micelles self-assembled from amphiphilic molecules dispersed in water (considered a green solvent) has facilitated reactions of organic compounds. When performing reactions in micelles, the hydrophobic effect can considerably accelerate apparent reaction rates, as well as enhance selectivity. Here, we review micellar reaction media and their potential role in sustainable chemical production. The focus of this review is applications of engineered amphiphilic systems for reactions (surface-active ionic liquids, designer s

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Huang, H., and R. E. Verrall. "Thermodynamics of micellization and solubilization in systems of water – sodium n-alkylcarboxylates – alkoxyethanols at 25 °C." Canadian Journal of Chemistry 75, no. 11 (1997): 1445–62. http://dx.doi.org/10.1139/v97-174.

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The apparent molar volumes and adiabatic compressibilities, [Formula: see text] of carboxylate surfactants, CnNa (n = 8, 10, 12), in aqueous solutions in the absence and presence of medium-chain-length alkoxyethanols, C4EOX (EO = ethylene oxide group, X = 0–4), and of alkoxyethanols, [Formula: see text] in aqueous solutions in the absence and presence of surfactant, were determined at 25 °C from density and sound velocity measurements as a function of both the surfactant and alcohol concentrations. The partial molar volumetric properties of CnNa and the transfer functions of C4EOX from water t

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Kuimov, Vladimir A., Svetlana F. Malysheva, Natalia A. Belogorlova, Ruslan I. Fattakhov, Alexander I. Albanov, and Boris A. Trofimov. "Triton-X-100 as an Organic Catalyst for One-Pot Synthesis of Arylmethyl-H-phosphinic Acids from Red Phosphorus and Arylmethyl Halides in the KOH/H2O/Toluene Multiphase Superbase System." Catalysts 13, no. 4 (2023): 720. http://dx.doi.org/10.3390/catal13040720.

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Triton-X-100, a polyethylene glycol 4-(tert-octyl)phenyl ether, has been found to be an active micellar organic catalyst for the one-pot selective synthesis of arylmethyl-H-phosphinic acids in up to 65% yields by the direct phosphinylation of arylmethyl halides with red phosphorus in the KOH/H2O/toluene multiphase superbase system. The catalyst demonstrates a good recyclability. As a result, an expeditious method for the chemoselective synthesis of arylmethyl-H-phosphinic acids—versatile sought-after organophosphorus compounds—has been developed. The synthesis is implemented via direct alkylat

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Gracie, Kim, Dale Turner, and R. Palepu. "Thermodynamic properties of micellization of sodium dodecyl sulfate in binary mixtures of ethylene glycol with water." Canadian Journal of Chemistry 74, no. 9 (1996): 1616–25. http://dx.doi.org/10.1139/v96-179.

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Micellar properties of sodium dodecyl sulfate (SDS) in aqueous mixtures of ethylene glycol (EG) were determined using techniques such as conductivity, density, EMF, surface tension, viscosity, ultrasonic velocity, and spectroscopy (fluorescence). The effective degree of disssociation of micelles (α) was determined using three different methods. Thermodynamics of micellization were obtained from the temperature dependence of critical micelle concentrations (cmc) values. The difference in Gibbs energies of micellization [Formula: see text] of SDS, between water and mixed solvent systems, was cal

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Cruz Barrios, Eliandreina, Kyra V. Penino, and Onofrio Annunziata. "Diffusiophoresis of a Nonionic Micelle in Salt Gradients; Roles of Preferential Hydration and Salt-Induced Surfactant Aggregation." International Journal of Molecular Sciences 23, no. 22 (2022): 13710. http://dx.doi.org/10.3390/ijms232213710.

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Diffusiophoresis is the migration of a colloidal particle in water driven by concentration gradients of cosolutes such as salts. We have experimentally characterized the diffusiophoresis of tyloxapol micelles in the presence of MgSO4, a strong salting-out agent. Specifically, we determined the multicomponent-diffusion coefficients using Rayleigh interferometry, cloud points, and dynamic-light-scattering diffusion coefficients on the ternary tyloxapol–MgSO4–water system at 25 °C. Our experimental results show that micelle diffusiophoresis occurs from a high to a low salt concentration (positive

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41

Procházka, Karel, Hélène Delcros, and Geneviève Delmas. "A light scattering and calorimetric study of micelle formation by a polystyrene -b-hydrogenated polyisoprene block copolymer in a binary solvent (pentane–cyclopentane)." Canadian Journal of Chemistry 66, no. 4 (1988): 915–18. http://dx.doi.org/10.1139/v88-155.

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A light scattering and calorimetric study was made of micelle formation by a polystyrene-b-hydrogenated polyisoprene in a binary mixture. The polymer 0.42 weight percent PS, is unassociated in cyclopentane (c-C5) but forms micelles with a PS core in n-pentane, a non-solvent for PS. Light scattering measurements and heats of mixing, obtained over the binary composition range at a polymer concentration higher than the c.m.c., show that the solution changes from the unassociated to the micellar state for solutions richer in pentane than 0.4 volume fraction. Using heats of mixing of the correspond

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42

V, TejeswaraRao, Balaji K, Satya guru TVSPV, and Raju S. "Electrophilic Effects of Copper Ions on Kinetics of Dissociation of Tris (1,10- Phenanthroline) Iron (II) in Sodium Dodecyl Sulphate Micellar Medium." DER PHARMA CHEMICA 13, no. 3 (2021): 6. https://doi.org/10.5281/zenodo.11071171.

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Many metal ions have been found to exert electrophilic effects on the dissociation of complexes and it has been proposed that a ternary intermediate is formed involving the complex and metal ion through the severing of one of the metal ligand bonds. To investigate this aspect, the dissociation of Fe (phen)3 2+ and effects of metal ion like Cu2+ in the presence of SDS micelles providing anionic micellar surface. These results confirm that the formation of such a ternary intermediate and marked micellar catalysis of the reaction.

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43

V, TejeswaraRao, Balaji K, Satya guru TVSPV, and Raju S. "Electrophilic Effects of Copper Ions on Kinetics of Dissociation of Tris (1,10- Phenanthroline) Iron (II) in Sodium Dodecyl Sulphate Micellar Medium." Der Pharma Chemica 13, no. 3 (2021): 6. https://doi.org/10.5281/zenodo.14722794.

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Many metal ions have been found to exert electrophilic effects on the dissociation of complexes and it has been proposed that a ternary intermediate is formed involving the complex and metal ion through the severing of one of the metal ligand bonds. To investigate this aspect, the dissociation of Fe (phen)3 2+ and effects of metal ion like Cu2+ in the presence of SDS micelles providing anionic micellar surface. These results confirm that the formation of such a ternary intermediate and marked micellar catalysis of the reaction.

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44

Singh, R. K. London. "Micellar Effects on Nucleophilic Addition Reaction and Applicability of Enzyme Catalysis Model." E-Journal of Chemistry 9, no. 3 (2012): 1181–87. http://dx.doi.org/10.1155/2012/129436.

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This study describes the effect of anionic and cationic micelles on nucleophilic addition reaction of rosaniline hydrochloride (RH) with hydroxide under pseudo-first order condition. Strong inhibitory effect is observed due to SDS micelle, whereas CTAB catalysed the reaction. This is explained on the basis of electrostatic and hydrophobic interactions which are simultaneously operating in the reaction system. The kinetic data obtained is quantitatively analysed by applying the positive cooperativity model of enzyme catalysis. Binding constants and influence of counterions on the reaction have

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45

Ortega, Francisco, and Elvira Rodenas. "Counterion micellar effects upon the reaction of low-spin diimine iron(II) complexes." Canadian Journal of Chemistry 67, no. 2 (1989): 305–9. http://dx.doi.org/10.1139/v89-050.

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The rate of reaction of tris(1,10-phenanthroline)iron(II) ion (1a), tris(3,4,7,8-tetramethyl-1,10-phenanthroline)iron(II) ion (1b), and tris(4,7-diphenhyl-1, 10-phenanthroline)iron(II) ion (1c) with hydroxide ion, in cationic micelles, is strongly affected by the concentration of micellar counterion in solution. The reaction of la in CTACl is modestly speeded up by the addition of added KCl, while the reactions of 1b and 1c are strongly inhibited by the addition of large amounts of KCl and KBr to micellar solutions of CTACl and CTABr, respectively. These rate effects fit the pseudophase-ion ex

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46

Landry, Josette M., D. Gerrard Marangoni, Michael D. Lumsden, and Robert Berno. "1D and 2D NMR investigations of the micelle-formation process in 8-phenyloctanoate micelles." Canadian Journal of Chemistry 85, no. 3 (2007): 202–7. http://dx.doi.org/10.1139/v07-008.

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The micellization process of sodium 8-phenyloctanoate in a deuterated aqueous solution was studied, using 1H NMR spectroscopy and two-dimensional (2D) nuclear Overhauser enhancement spectroscopy (NOESY). 1H NMR spectra, acquired for the sodium 8-phenyloctanoate before and after the critical micelle concentration (CMC) value, showed that large chemical-shift changes were observed for both the aromatic proton peaks and the peaks for the methylene protons near the terminal phenyl group. The plots for the methylene protons near the headgroup do not show these large chemical-shift changes. These ob

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Ilhami, Fasih Bintang, Kai-Chen Peng, Yi-Shiuan Chang, et al. "Photo-Responsive Supramolecular Micelles for Controlled Drug Release and Improved Chemotherapy." International Journal of Molecular Sciences 22, no. 1 (2020): 154. http://dx.doi.org/10.3390/ijms22010154.

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Development of stimuli-responsive supramolecular micelles that enable high levels of well-controlled drug release in cancer cells remains a grand challenge. Here, we encapsulated the antitumor drug doxorubicin (DOX) and pro-photosensitizer 5-aminolevulinic acid (5-ALA) within adenine-functionalized supramolecular micelles (A-PPG), in order to achieve effective drug delivery combined with photo-chemotherapy. The resulting DOX/5-ALA-loaded micelles exhibited excellent light and pH-responsive behavior in aqueous solution and high drug-entrapment stability in serum-rich media. A short duration (1–

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48

Martinek, Karel, Iliya V. Berezin, Yurii L. Khmelnitski, Natalya L. Klyachko, and Andrei V. Levashov. "Micellar enzymology: Potentialities in applied areas (biotechnology)." Collection of Czechoslovak Chemical Communications 52, no. 10 (1987): 2589–602. http://dx.doi.org/10.1135/cccc19872589.

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Micellar enzymology, a new trend in molecular biology, studies the catalysis by enzymes entrapped into hydrated reversed micelles of surfactants (detergents, phospholipids) in organic solvents. The effect of solubilization on enzymatic properties is briefly considered. Applications of such biocatalytic systems in fine organic syntheses, in clinical and chemical analyses, and in medicine, as well as probable future trends in biotechnology are discussed.

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Tee, Oswald S., and Ogaritte J. Yazbeck. "Transition state stabilization by micelles: thiolysis of p-nitrophenyl alkanoates in cetyltrimethylammonium bromide micelles." Canadian Journal of Chemistry 78, no. 8 (2000): 1100–1108. http://dx.doi.org/10.1139/v00-113.

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Thiolysis of p-nitrophenyl esters (acetate to decanoate) by the anion of 2-mercaptoethanol (ME) is catalyzed by micelles of cetyltrimethylammonium bromide (CTAB) in aqueous solution. At fixed [ME], the observed rate constants (kobs) show saturation with respect to added [CTAB], consistent with ester binding in the micelles. Plots of kobs vs. [ME] are linear in the absence and in the presence of the CTAB, and analysis of the slopes of the plots afford rates constants for thiolate ion attack on the esters in the aqueous phase (kN) and in the micellar phase (kcN). The strengths of substrate bindi

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Stavber, Gaj. "The Road to Greener Applied Organic Synthesis: Performing Organic Reactions in Micelle-Based and Host-Guest Aqueous Nanoreactors." Australian Journal of Chemistry 63, no. 5 (2010): 849. http://dx.doi.org/10.1071/ch10051.

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The micellar and supramolecular catalysis of organic reactions in water, utilizing nanometre-sized micelles of ionic, non-ionic amphiphiles or host-guest inclusion complexes using appropriate host macrocyclic molecules able to accommodate a hydrophobic organic substrates are taken under a brief account. A focus on Heck-type C-C couplings, ring closing metathesis, and halo-transformations of organic compounds in aqueous environment, is presented.

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