Photorheological Effects in Aqueous Micellar Tetramethylammoniumhydrogen-2-dodecyl Malonate via Photodimerization of Acridizinium Bromide

Lehnberger, C.; Wolff, Thomas

doi:10.1006/jcis.1999.6126

Cited by 15 publications

(7 citation statements)

References 18 publications

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“…56 Recently, the same group further compared the rheological response of tetramethylammoniumhydrogen-2-dodecyl malonate (TMHM) solutions in the absence and presence of monomeric and photodimerized acridizinium bromide as solubilizates. 57 WLMs are present in the pure TMHM solutions, as confirmed by rheological measurements. However, after the addition of acridizinium bromide, the viscoelasticity of the initial TMHM WLMs solution was reduced significantly because the acridizinium cations can adsorb strongly at the negatively charged TMHM headgroups and change the overall charge of the micellar surface, and thus affect their aggregation behaviour.…”

Section: Light-responsive Wlmssupporting

confidence: 63%

“…Based on the discussion above, we envision that many of these SWLMs systems have potential as vehicles for controlled and targeted delivery. Other useful triggers reported for smart WLMs include light, 43,49,[52][53][54][55][56][57][59][60][61][62][63][64][65][66] because of the possibility to direct it to specific body compartments. One could also envisage imparting responsiveness to chemical and biological stimuli, such as glucose concentration for the treatment of diabetes 5 or the presence of metabolites.…”

Section: Biomedicinementioning

confidence: 99%

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Smart wormlike micelles

2013

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A major scientific challenge of the past decade pertaining to the field of soft matter has been to craft 'adaptable' materials, inspired by nature, which can dynamically alter their structure and functionality on demand, in response to triggers produced by environmental changes. Amongst these, 'smart' surfactant wormlike micelles, responsive to external stimuli, are a particularly recent area of development, yet highly promising, given the versatility of the materials but simplicity of the design-relying on small amphiphilic molecules and their spontaneous self-assembly. The switching 'on' and 'off' of the micellar assembly structures has been reported using electrical, optical, thermal or pH triggers and is now envisaged for multiple stimuli. The structural changes, in turn, can induce major variations in the macroscopic characteristics, affecting properties such as viscosity and elasticity and sometimes even leading to a spontaneous and effective 'sol-gel' transition. These original smart materials based on wormlike micelles have been successfully used in the oil industry, and offer a significant potential in a wide range of other technological applications, including biomedicine, cleaning processes, drag reduction, template synthesis, to name but a few. This review will report results in this field published over the last few years, describe the potential and practical applications of stimuli-responsive wormlike micelles and point out future challenges.

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Section: Light-responsive Wlmssupporting

confidence: 63%

Section: Biomedicinementioning

confidence: 99%

Smart wormlike micelles

2013

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“…Recently, the same group further compared the rheological response of tetramethylammoniumhydrogen-2-dodecyl malonate (TMHM) solutions in the absence and presence of monomeric and photo-dimerized acridizinium bromide as solubilizates [9]. WLMs were present in pure TMHM solutions, as confirmed by rheological experiments.…”

Section: Monomerization/dimerization Of a Light-sensitive Additivementioning

confidence: 93%

Light-responsive Wormlike Micelles

Feng¹,

Chu

Dreiss

2015

SpringerBriefs in Molecular Science

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UV/Vis light as a trigger displays a set of advantages over other types of stimuli in terms of its "clean" character, low cost, and precise spatial localization, and for these reasons it has been widely exploited in the development of smart materials. Light-responsive wormlike micelles take advantage of light-induced cis-trans isomerization or dimerization of light-sensitive surfactants or additives containing a suitable chromophore. These changes alter the packing of surfactant molecules in the aggregates and drive micellar transitions between wormlike micelles and other structures, thus tuning the viscoelasticity. This chapter summarizes two types of strategies in manipulating light-sensitive wormlike micelleseither to incorporate light-sensitive additives into classical existing wormlike micellar solutions or to directly introduce light-sensitive functional moieties on the surfactant molecules. In both cases, the worms self-assemble or disassemble upon alternate UV/Vis light irradiation.Keywords Photo-switchable · Light-responsive · Wormlike micelles · Azobenzene · Cis-trans isomerization · Photo-rheology UV/Vis light as a trigger displays a set of benefits over other types of stimuli and thus has been widely exploited in the development of smart materials [1][2][3][4]. Light as a stimulus is relevant to many biological processes, in which optical signals are recorded and transduced as sophisticated biochemical events. In addition, in contrast to redox reagents, pH, stress, or salinity, light is an elegant and non-invasive trigger and can be operated in a clean environment, thus avoiding changes in the composition or thermodynamic conditions. It is a cheap and readily available trigger as a mild energy source. Finally, better than ultrasound and electricity, light can be directed at a precise spatial location; this is particularly valuable in nanoscience and nanotechnology and for medical applications.Light has been used as a trigger by exploiting dimerization, cis-trans isomerization, photo-scission, polymerization, or polarity changes in a range of systems [3]. However, quite obviously, not all reported light-sensitive surfactants

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“…8,9 Moreover, light stimulation can also be accurately localized, enabling both temporal and spatial control. 10 Several photosensitive units, such as azobenzene, 11−13 stilbene, 14,15 dithienylcyclopentene, 16 naphthopyran, 6,17 spiropyran, 18,19 trans-2,4,4′-trihydroxychalcone, 20 cinnamic acids, 21,22 coumarins, 23 acridizinium bromide, 24 anthracenes, 25 and merocyanine, 19 show changes in viscosity on exposure to particular wavelengths of electromagnetic radiation. Light-induced molecular conformational changes can be used to switch the rheological behavior of materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Reversible Photorheological Lyotropic Liquid Crystals

et al. 2013

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We describe novel lyotropic liquid-crystalline (LLC) materials based on photoresponsive amphiphiles that exhibit rapid photoswitchable rheological properties of unprecedented magnitude between solidlike and liquidlike states. This was achieved through the synthesis of a novel azobenzene-containing surfactant (azo-surfactant) that actuates the transition between different LLC forms depending on illumination conditions. Initially, the azo-surfactant/water mixtures formed highly ordered and viscous LLC phases at 20-55 wt % water content. Spectroscopic, microscopic, and rheological analysis confirmed that UV irradiation induced the trans to cis isomerization of the azo-surfactant, leading to the disruption of the ordered LLC phases and a dramatic, rapid decrease in the viscosity and modulus resulting in a 3 orders of magnitude change from a solid (20,000 Pa) to a liquid (50 Pa) at rate of 13,500 Pa/s. Subsequent exposure to visible light reverses the transition, returning the viscosity essentially to its initial state. Such large, rapid, and reversible changes in rheological properties within this LLC system may open a door to new applications for photorheological fluids.

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Photorheological Effects in Aqueous Micellar Tetramethylammoniumhydrogen-2-dodecyl Malonate via Photodimerization of Acridizinium Bromide

Cited by 15 publications

References 18 publications

Smart wormlike micelles

Smart wormlike micelles

Light-responsive Wormlike Micelles

Reversible Photorheological Lyotropic Liquid Crystals

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