Endowing catanionic surfactant vesicles with dual responsive abilities via a noncovalent strategy: introduction of a responser, sodium cholate

Jiang, Lingxiang; Wang, Ke; Ke, Fuyou; Liang, Dehai; Huang, Jianbin

doi:10.1039/b813498g

Cited by 52 publications

(40 citation statements)

References 50 publications

(50 reference statements)

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“…The vector approach is, however, by no means limited to directed assembly. It is possible to mix a trace amount of carefully designed pin molecules with a large amount of dummy molecules so that molecular assemblies can be massively produced and be switched between micelles, vesicles and tubes upon simple clicks 28 . Second, chemical fixation of the vector structure is envisioned to be feasible given a number of well-established methods such as sintering, polymer grafting and cross-linking, and capillary condensation 29 30 31 .…”

Section: Discussionmentioning

confidence: 99%

Vector assembly of colloids on monolayer substrates

et al. 2017

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The key to spontaneous and directed assembly is to encode the desired assembly information to building blocks in a programmable and efficient way. In computer graphics, raster graphics encodes images on a single-pixel level, conferring fine details at the expense of large file sizes, whereas vector graphics encrypts shape information into vectors that allow small file sizes and operational transformations. Here, we adapt this raster/vector concept to a 2D colloidal system and realize ‘vector assembly' by manipulating particles on a colloidal monolayer substrate with optical tweezers. In contrast to raster assembly that assigns optical tweezers to each particle, vector assembly requires a minimal number of optical tweezers that allow operations like chain elongation and shortening. This vector approach enables simple uniform particles to form a vast collection of colloidal arenes and colloidenes, the spontaneous dissociation of which is achieved with precision and stage-by-stage complexity by simply removing the optical tweezers.

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Section: Discussionmentioning

confidence: 99%

Vector assembly of colloids on monolayer substrates

et al. 2017

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“…Upon irradiation by UV light, OMCA undergoes a photo-isomerization from cis to trans, altering molecular packing at the interface, thus drastically reducing micellar length and resulting in a viscosity decrease by four orders of magnitude. The strategy proposed by Jiang et al [27] was successfully extended to other surfactants mixtures. It has the obvious advantage of sidestepping difficult synthesis, while the nature of the responser can easily be extended to a range of molecules, as long as they present some hydrophobicity, so that they can spontaneously be incorporated into micellar aggregates: hydrotropes, dyes, light-responsive cinnamic acid, redox-responsive ferrocene carboxylic acid, and pH-responsive malachite green.…”

Section: Multi-stimuli-responsive Wlmsmentioning

confidence: 97%

“…Also relevant to the field of WLMs, because it suggests potential non-covalent routes to impart them, multi-stimuli responsiveness is the work reported by Huang and co-workers [27] on surfactant aggregates. Multi-stimuli responsiveness was imparted to otherwise responsiveness catanionic (mixtures of cationic and anionic) surfactants by the simple addition of a "responser" (a multi-stimuli-responsive molecule) in sodium cholate (SC), which has three temperature-responsive hydroxyl groups, a pH-responsive carboxylate group and a hydrophobic steroid skeleton.…”

Section: Multi-stimuli-responsive Wlmsmentioning

confidence: 97%

Other Types of Smart Wormlike Micelles

Feng¹,

Chu

Dreiss

2015

SpringerBriefs in Molecular Science

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In comparison with the widely reported triggers described in previous chapters-namely temperature, pH, and light-this chapter discusses triggers which have been far less documented: redox potential and hydrocarbons and their use to control the assembly and properties of wormlike micelles. In addition, recent reports of multiple stimuli-responsive wormlike micelles are also described, as well as smart reverse wormlike micelles, to complete this collection of "unconventional" smart wormlike micelles.Keywords Redox-responsive · Hydrocarbon-responsive · Multi-responsive · Smart reverse wormlike micelles Redox-Responsive WLMsThe first redox-sensitive surfactant was reported nearly 30 years ago by Saji et al. [1,2]. They incorporated a ferrocene-based moiety into the surfactant and found that the CMC and micellization behaviour were altered under the stimulus of electron transfer, and they observed that micelles could be broken up into monomers by oxidation and re-formed by reduction. More details on this type of surfactants can be found in recent reviews by Abbott [3] and Eastoe [4].Despite this prior work, the only example of redox-sensitive WLMs, to our knowledge, was reported by Abe et al. [5] in 2004, and motivated by the development of electro-rheological (ER) fluids. ER fluids are colloidal dispersions whose viscosity can be controlled by an applied electric potential and are regarded as versatile materials for building up smart structures and machines. These fluids have applications in valves and clutches for transmission and precise control of mechanical positioning. They are conventionally produced by dispersing solid particles within a liquid. The application of an alternating electric field to the ER dispersions produces a viscosity increase mainly in the direction perpendicular to the field, because the dispersed particles align to form strings in the direction parallel

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“…Except for temperaturecontrolled or salt-induced vesicle-to-micelle transitions in those asymmetric systems explained by ion-pair solubility mismatch, 11,32,54 the transition from vesicles to micelles found in many mixtures of cationic-anionic surfactants with similar chain length inducing by temperature and bio amphiphiles could be well explained by the packing parameter, involving the factors such as the volume of hydrophobic chains, 55 the charge density, 56 and the average headgroup area. 57 As an exception, for the symmetric mixtures of sodium dodecylsulfate (SDS) and dodecyltrimethylammonium bromide (DTAB) whose compositions are far from equimolarity, the vesicle-to-micelle transition by adding 0.1 M NaBr can be rationalized as a consequence of the transition of free monomers into the aggregates as the chemical potential of the surfactant in excess is lowered upon addition of salt. 12 The addition of salts has multiple effects on a surfactant solution, such as a ''salting-out'' effect, and ''screening'' effect on either inter-aggregate or intra-aggregate electrostatic repulsions due to the like-charged headgroups of surfactants.…”

Section: Mechanism From Packing Parametermentioning

confidence: 99%

Anomalous effects of concentrated salts on the equimolarly mixed cationic–anionic surfactant mixtures

et al. 2011

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and CsCl) on the morphology of the aggregates of decyltriethylammonium bromide and sodium decylsulfonate (C 10 NE-C 10 SO 3 ) mixtures with equimolar ratios were studied by static/dynamic light scattering and viscosity measurements. The average hydrodynamic radii of the aggregates, the apparent aggregation number, and the relative viscosity as functions of both the concentrations of surfactants and added salts were investigated, respectively. It showed that the addition of a small amount of NaX (e.g., 0.1 M) had only small effects on the C 10 NE-C 10 SO 3 vesicles. However, striking anion specificity, which differed anomalously with the anions of salts varying from F À to I À , was observed when large amounts of NaX (e.g., 1 M) were added. The size of the C 10 NE-C 10 SO 3 aggregates was normally increased and then a liquid-liquid phase separation occurred with the addition of NaF; meanwhile, the addition of NaCl had little effect on the C 10 NE-C 10 SO 3 aggregates under experimental conditions; however, the size of the C 10 NE-C 10 SO 3 aggregates was abnormally decreased when high concentrations of NaBr or NaI (up to 2 M) were added, implying a vesicle-to-micelle transition which might be due to a decrease in the intramicellar attraction between oppositely charged headgroups by electrical shielding, and the mixtures still remained homogeneous. A cation specificity of added salts was also observed with the increase of the ionic radii from Na + to Cs + . However, it was noted that the influence of increasing the ionic radii of cations on the aggregate size was not as pronounced as that of anions in the presence of high concentrations of salts. The aggregates of C 10 NE-C 10 SO 3 became a little smaller when concentrated alkali metal halides with bigger cations were added into this homogeneous equimolar cationic-anionic surfactant mixture. Both the observed cation and anion specificities were consistent with the Hofmeister series.

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Endowing catanionic surfactant vesicles with dual responsive abilities via a noncovalent strategy: introduction of a responser, sodium cholate

Cited by 52 publications

References 50 publications

Vector assembly of colloids on monolayer substrates

Vector assembly of colloids on monolayer substrates

Other Types of Smart Wormlike Micelles

Anomalous effects of concentrated salts on the equimolarly mixed cationic–anionic surfactant mixtures

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