CO2-controllable smart nanostructured fluids in a pseudo Gemini surfactant system

Zhao, Guang; Wu, Xuepeng; Luan, Rizhong; Shaikh, Azizullah; Fan, Haiming; Dai, Caili

doi:10.1016/j.molliq.2018.10.144

Cited by 23 publications

(7 citation statements)

References 25 publications

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“…Stimuli-responsive self-assemblies formed by surfactants or amphiphilic polymers in solutions have engaged wide interests primarily because their macroscopic physicochemical properties and microstructures have momentary and great changes in response to various stimuli including light, , redox reaction, , magnetic field, , temperature, , sound, , pH change, − or combined stimuli. , Self-assemblies with controllable responsivity have potential applications in various fields including hydrogel materials, , catalysis, drug delivery, − biosensors, perfume in personal care products, and especially soft templates with controllable structures for the synthesis of nanometer materials with various morphologies . Among them, the applications of stimuli-responsive vesicles and wormlike micelles were most widely studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Substituent Position on the Phase Behavior and Photoresponsive Dynamic Behavior of Mixed Systems of a Gemini Surfactant and trans-Methoxy Sodium Cinnamates

Shang

Chen

et al. 2021

Langmuir

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Mixed systems of the Gemini cationic surfactant trimethylene-1,3-bis (dodecyldimethylammonium bromide) (12-3-12·2Br–) and the photosensitive additives trans-methoxy sodium cinnamates with different substituent positions (trans-ortho-methoxy cinnamate, trans-OMCA; trans-meta-methoxy cinnamate, trans-MMCA; and trans-para-methoxy cinnamate, trans-PMCA) were selected for investigating the effects of the substituting position of methoxy on the system phase diagram and UV light-responsive behavior of the wormlike micelles. The differences in phase behaviors of the selected systems were analyzed by calculating the potential distribution, molecular volume, and free energy of solvation of cinnamates and the binding energies between photosensitive additives and the surfactant. The photoresponsive behaviors of wormlike micelle solutions formed in the selected systems were studied by the rheological method and UV–vis and H nuclear magnetic resonance (1H NMR) spectroscopy; the kinetics of photoisomerization of trans-OMCA, trans-MMCA, and trans-PMCA were studied by first-order derivative spectrophotometry. The results reveal that the methoxy substituent position has a great influence on the phase behavior and photosensitivity of the studied systems. In addition, the photoisomerization of the studied cinnamates follows the first-order opposite reaction laws; the different reaction rates play the decisive role in the photosensitivity of the wormlike micelles. This paper would afford a deeper understanding of the UV light-responsive mechanism at the molecular level and provide essential guidance in preparing smart materials with adjustable light sensitivity.

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Section: Introductionmentioning

confidence: 99%

Effect of the Substituent Position on the Phase Behavior and Photoresponsive Dynamic Behavior of Mixed Systems of a Gemini Surfactant and trans-Methoxy Sodium Cinnamates

Shang

Chen

et al. 2021

Langmuir

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“…More interestingly, WLMs can be made responsive to external stimuli such as light, − temperature, ,, pH, ,− CO 2 , ,− redox reaction, , and even a combination of stimuli. ,, These systems, called “smart” WLMs, have a common feature in that the stimulus causes a drastic change in the size (contour length) of the WLM chains. In turn, the rheological properties of the WLM solution such as its zero-shear viscosity (η 0 ) or its relaxation time (τ R ) can be varied by orders of magnitude.…”

Section: Introductionmentioning

confidence: 99%

“…There are several studies describing smart WLMs that are responsive to pH. The various strategies in these studies include the use of a pH-responsive surfactant, ,, the combination of a conventional surfactant and a pH-responsive organic compound such as oxalic acid, hydroxycinnamic acid, or benzenedioic acid, and the incorporation of CO 2 . ,− It is possible to formulate pH-responsive WLMs that can be triggered over any pH rangeacidic, , neutral, or basic. , WLMs that are responsive under acidic conditions are particularly attractive as they could have an important application in oil recovery (acid diversion in carbonate rocks). , …”

Section: Introductionmentioning

confidence: 99%

Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

2020

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“Smart” fluids displaying large changes in their rheological properties in response to external stimuli have been of great interest in recent years. For example, “smart” wormlike micelles (WLMs) that respond to pH can be readily formulated by combining a cationic surfactant such as cetyltrimethylammonium bromide (CTAB) with an aromatic compound such as 1,2-dihydroxybenzene (DHB). Here, we show that a pH-responsive aqueous formulation as mentioned above can be simultaneously made responsive to ultraviolet (UV) light by incorporating a photoacid generator (PAG) into the system. A commercially available PAG, diphenyliodonium-2-carboxylate, is used here. Upon exposure to UV light, this PAG irreversibly photolyzes into iodobenzene (IB) and benzoic acid (BA), with the formation of BA, leading to a drop in pH. WLMs formed by mixtures of CTAB, DHB, and the PAG are systematically characterized before and after UV irradiation. As the PAG photolyzes, an increase in the viscosity of WLMs occurs by a factor of 1000. We show that the ratio of the zero-shear viscosity η0 (after UV/before UV) depends on the initial pH of the sample. The UV-induced increase in η0 can be attributed to the growth of WLMs in solution, which in turn is influenced by both the ionization state of DHB and the presence of IB and BA.

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“…Recently, various stimuli-responsive Gemini surfactants have been successfully synthesized by introducing functional groups, which are sensitive to temperature, pH, light, and CO 2 . However, no Gemini surfactants capable of responding to external magnetic fields have yet obtained.…”

Section: Introductionmentioning

confidence: 99%

“…11,12 Recently, various stimuli-responsive Gemini surfactants have been successfully synthesized by introducing functional groups, which are sensitive to temperature, 13 pH, 14 light, 15 and CO 2 . 16 However, no Gemini surfactants capable of responding to external magnetic fields have yet obtained. As far as we know, the first magnetic cationic surfactants were synthesized using appropriate cationic surfactants and magneto-active metal halides containing Fe 3+ -, Gd 3+ -, and Ho 3+ -based counterions by Eastoe et al in 2012.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Gemini Surfactants

Huang

Hao

2019

Langmuir

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A homologous series of Gemini surfactants, dimethylene-1,2-bis(alkyldimethyl-ammonium bromide) (referred to as n-2-n·2Br, n = 14, 16, and 18) and Fe- or lanthanide metal-based magnetic Gemini surfactants (abbreviated as n-2-n·2X, X = Fe, Ce, and Gd), were first synthesized. Measurements of surface tension and electrical conductivity determine the physical quantities related to the surface activities of n-2-n·2Br and n-2-n·2X, and the magnetic behaviors of n-2-n·2X are elucidated by superconducting quantum interference device magnetometry. Thermogravimetric analysis and differential scanning calorimetry have been used to investigate thermotropic liquid crystalline properties of all aforementioned surfactants, and the liquid crystal textures were further observed via polarizing optical microscopy. These results reveal that for magneto-responsive Gemini surfactants, both magnetic counterions and alkyl chain lengths have certain effect on surface activities, magnetism, and thermotropic phase behavior. We summed up these changes and discussed the causes, which could provide a new insight into controlling the properties of magnetic surfactants.

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CO2-controllable smart nanostructured fluids in a pseudo Gemini surfactant system

Cited by 23 publications

References 25 publications

Effect of the Substituent Position on the Phase Behavior and Photoresponsive Dynamic Behavior of Mixed Systems of a Gemini Surfactant and trans-Methoxy Sodium Cinnamates

Effect of the Substituent Position on the Phase Behavior and Photoresponsive Dynamic Behavior of Mixed Systems of a Gemini Surfactant and trans-Methoxy Sodium Cinnamates

Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

Magnetic Gemini Surfactants

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