Calorimetric study on interaction of water-soluble copolymers with ionic surfactant

Yan, Hu; Kawamitsu, Hiroka; Kushi, Yoshinori; Kuwajima, Teruaki; Ishii, K.; Toshima, Naoki

doi:10.1016/j.jcis.2007.06.061

Cited by 6 publications

(5 citation statements)

References 21 publications

(41 reference statements)

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“…Thereafter, the height of the endothermic peaks declined. Earlier investigations using ITC that examined the titration curves of ionic surfactants in buffered solutions suggested that the titration curves consist of three regions, i.e., region I: complete demicellization of ionic surfactants from the micellar state of the injectant to the critical micelle concentration (CMC); region II: a distinct point at the maximum of the titration curve that corresponds to the transition concentration from monomers to micelles; and region III: simple dilution of the surfactant micelles of the injectant (Wangsakan, Chinachoti, & McClements, 2001;Wangsakan et al, 2004;Yan et al, 2007). Similar regions of the titration curves were observed in our study.…”

Section: Influence Of Surfactant Types On Surfactant-ca Interactionsmentioning

confidence: 99%

“…With this in mind, an improved understanding of the nature of the interactions between CAs and guest materials may lead to the development of functional ingredients with enhanced or unique properties. Therefore, in this study we investigated the characteristics of inclusion complexes of CAs formed with surfactants by isothermal titration calorimetry (ITC), which is a powerful technique to study these types of interactions (Fox, Bloor, Holzwarth, & Wyn-Jones, 1998;Ollila et al, 2001;Seng & Tam, 2000;Yan et al, 2007). Surfactants were chosen as a guest material because they may bind and incorporate their non-polar tails into helical regions of polymer chains of cyclodextrins, oligosaccharides, and polysaccharides.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of inclusion complexes of cycloamylose with surfactants by isothermal titration calorimetry

Mun

Rho

Kim

2009

Carbohydrate Polymers

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Section: Influence Of Surfactant Types On Surfactant-ca Interactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of inclusion complexes of cycloamylose with surfactants by isothermal titration calorimetry

Mun

Rho

Kim

2009

Carbohydrate Polymers

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“…Isothermal titration calorimetry (ITC) and proton nuclear magnetic resonance ( 1 H NMR) and two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY) are powerful techniques used to study the interactions of mixed surfactant systems. − ITC is employed to measure the binding thermodynamic of polymer–surfactant complexation, hydrogel formation, polymer aggregation, micellization, and guest–host complexation. Additionally, it can also be used to study the dissociation of micelles into monomers or the formation of micelles with increasing surfactant concentration.…”

Section: Introductionmentioning

confidence: 99%

Strong Synergistic Molecular Interaction in Catanionic Surfactant Mixtures: Unravelling the Role of the Benzene Ring

Wang,

Xiao,

et al. 2023

Langmuir

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Noncovalent interactions play a crucial role in driving the formation of diverse self-assembled structures in surfactant systems. Surfactants containing a benzene ring structure are an important subset of surfactants. These surfactants exhibit unique colloid and interfacial properties, which give rise to fascinating transformations in the aggregate structures. These transformations are directly influenced by specific noncovalent interactions facilitated by the benzene ring structure including cation−π and π−π interactions. Investigating catanionic surfactant systems that incorporate benzene ring structures provides valuable insights into the distinct noncovalent interactions observed in mixed surfactant systems. Our approach involved studying the enthalpy change ΔH during the titration process, utilizing isothermal titration calorimetry (ITC). Simultaneously, we employed cryogenic transmission electron microscopy (cryo-TEM) to observe the corresponding self-assembly structures. To gain further insight, we delved into the noncovalent interactions of the mixed systems by analyzing the molecular environments variations through chemical shifts of the aggregates using proton magnetic resonance ( 1 H NMR). The intermolecular interaction was also confirmed by the two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY). We conducted a systematic study of the effects of NaCl concentrations, molar ratios, and molecular structures of surfactants on aggregate structures. The existence forms of surfactants are closely linked to the shape of the titration curve and the transition of the aggregate structures. When cationic surfactants were titrated into sodium dodecylbenzenesulfonate (SDBS) micelle solutions, the dominant cation−π interaction leads to the direct formation of vesicle structures. Conversely, when the SDBS system is titrated into benzyldimethyldodecylammonium chloride (DDBAC) micelles, a delicate balance of multiple noncovalent interactions, including cation−π, π−π, hydrophobic, and electrostatic forces, results in a range of aggregate structure transformations such as worm-like micelles and vesicular structures.

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“…[13][14][15][16][17][18] For example, the interaction of poly(ethylene glycol) (PEG or PEO) with ionic surfactants such as sodium dodecyl sulfate (SDS), cesium perfluorooctanoate (CsPFO), and lithium perfluoronctanoate (LiPFO) has been investigated. 14, [19][20][21] And the results indicate that the addition of PEG induces the surfactants to aggregate, and that the structure of the surface/PEG complexes depends on the concentration and molecular weight of PEG and on the hydrophobic segments of surfactants.…”

Section: Introductionmentioning

confidence: 99%

“…In surfactant systems, the interaction between water-soluble polymers and surfactants has received enormous attention, because the addition of polymer to the surfactant system would improve the properties, such as stability, dispersity, rheology. – For example, the interaction of poly(ethylene glycol) (PEG or PEO) with ionic surfactants such as sodium dodecyl sulfate (SDS), cesium perfluorooctanoate (CsPFO), and lithium perfluoronctanoate (LiPFO) has been investigated. ,– And the results indicate that the addition of PEG induces the surfactants to aggregate, and that the structure of the surface/PEG complexes depends on the concentration and molecular weight of PEG and on the hydrophobic segments of surfactants. Much research also proves that nonionic surfactants can interact with neutral polymer and form new aggregates. – However, the interaction of PEO/nonionic surfactants does not involve the same type of specificity in the binding of surfactant micelles to the polymer chain as that of PEO/ionic surfactants: nonionic surfactants have the same value for the critical micelle concentration (cmc) in the presence of the polymer as in water, in contrast to the considerably lower critical aggregation concentration (cac) when ionic surfactants interact with uncharged polymer .…”

Section: Introductionmentioning

confidence: 99%

Binding Characteristics between Poly(ethylene glycol) and Hydrophilic Modified Ibuprofen in Aqueous Solution

Wei

Guo

2010

J. Phys. Chem. B

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The solubility of ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID), is enhanced by synthesizing ibuprofen ester with a water-soluble polymer, poly(ethylene glycol) (PEG), and the product obtained functions as a nonionic surfactant (IBF-PEG800, IP800). The morphology and aggregation behavior of IP800 micelles and IP800/PEG complexes in aqueous solution are investigated by (1)H NMR technology, dynamic light scattering (DLS), isothermal titration calorimetry (ITC), and fluorescence resonance energy transfer (FRET). The microstructure of IP800 micelles is strongly related to the concentration of IP800. IP800 monomers can form looser micelles at relatively low concentrations and much tighter micelles at high concentrations. And the binding model of PEG with looser IP800 micelles dramatically depends on the molecular weight and concentration of PEG: PEG with lower molecular weight (MW < or = 2000 Da) inserts to the interface of the hydrophilic corona and hydrophobic core of IP800 micelles; PEG with higher molecular weight (MW > 2000 Da) binds to the surface of IP800 micelles, and one long PEG chain (6000 < MW < or = 20000 Da) wraps several IP800 micelles. Besides, the ratio of short chain PEG400 to IP800 micelles of the IP800/PEG complex is about 15:1 at a fixed concentration of IP800 (0.05 mM), and for the long chain PEG20000 it is 1:3-1:4.

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Calorimetric study on interaction of water-soluble copolymers with ionic surfactant

Cited by 6 publications

References 21 publications

Study of inclusion complexes of cycloamylose with surfactants by isothermal titration calorimetry

Study of inclusion complexes of cycloamylose with surfactants by isothermal titration calorimetry

Strong Synergistic Molecular Interaction in Catanionic Surfactant Mixtures: Unravelling the Role of the Benzene Ring

Binding Characteristics between Poly(ethylene glycol) and Hydrophilic Modified Ibuprofen in Aqueous Solution

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