Structural changes in liquid crystal polymer vesicles induced by temperature variation and magnetic fields

Hocine, Sabrina; Brûlet, Annie; Jia, Lin; Yang, Jing; Cicco, Aurélie Di; Bouteiller, Laurent; Li, Min-Hui

doi:10.1039/c0sm00751j

Cited by 26 publications

(19 citation statements)

References 48 publications

(70 reference statements)

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“…The applied magnetic field causes the polymer backbone to partially orient. Experiments on another liquid crystalline block copolymer to map out the temperature-magnetic field phase diagram have also been reported [93]. When doped with lanthanides, lipid membranes can also be oriented [94].…”

Section: Electromagnetic Fieldsmentioning

confidence: 95%

Soft Matter Sample Environments for Time-Resolved Small Angle Neutron Scattering Experiments: A Review

et al. 2021

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With the promise of new, more powerful neutron sources in the future, the possibilities for time-resolved neutron scattering experiments will improve and are bound to gain in interest. While there is already a large body of work on the accurate control of temperature, pressure, and magnetic fields for static experiments, this field is less well developed for time-resolved experiments on soft condensed matter and biomaterials. We present here an overview of different sample environments and technique combinations that have been developed so far and which might inspire further developments so that one can take full advantage of both the existing facilities as well as the possibilities that future high intensity neutron sources will offer.

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Section: Electromagnetic Fieldsmentioning

confidence: 95%

Soft Matter Sample Environments for Time-Resolved Small Angle Neutron Scattering Experiments: A Review

et al. 2021

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“…Our group worked on the LC polymersomes PEG-b-PA444 and PEG-bPAazo444 that contain diamagnetic mesogens (Hocine et al 2011). We hoped to achieve the structural changes triggered by magnetic field using the intrinsic positive diamagnetic response of the LC polymers.…”

Section: Polymersomes Responsive To Magnetic Fieldmentioning

confidence: 99%

“…If this responsiveness could be retained in the liquid crystal membrane, we speculated that liquid crystal polymersomes would have potential as multi-responsive, smart polymersomes. Recently, we studied the structural changes in liquid crystal polymersomes triggered by changes in temperature using small angle neutron scattering (SANS), cryo-TEM, SEM and high sensitivity DSC (Hocine et al 2011). PEG-b-PA444 and PEG-b-PMAazo444 (Fig.…”

Section: Temperature Responsive Polymersomesmentioning

confidence: 99%

Stimuli-Responsive Polymersomes

2011

Intracellular Delivery

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Polymer vesicles, commonly called polymersomes, are spherical shell structures in which an aqueous compartment is enclosed by a bilayer membrane made from amphiphilic block copolymers. Compared to liposomes, their low molecular weight analogues, polymersomes have many superior properties (higher toughness, better stability, tailorable membrane properties), which make them attractive candidates for applications including drug delivery, diagnosis, nanoreactors and templates for micro-or nano-structured materials. Many potential applications require the ability to control the release of substances encapsulated in the interior compartment and /or in the hydrophobic core of membrane. To address this goal, polymersomes have been developed in which a specific stimulus destabilises the vesicular structure. The responsiveness is mainly achieved via proper hydrophobic block design. In this chapter we review the most promising approaches to make stimuli-responsive polymersomes that permit the controlled release of encapsulated contents. Chemical stimuli including hydrolysis, oxidation, reduction and pH change, and physical stimuli including temperature, light, magnetic field, electric field, osmotic shock and ultrasonic wave are discussed, on emphasizing their effects on the chemical and physical structure of the amphiphilic copolymers.

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“…59 Furthermore, the thickness of the vesicle membrane was determined from a plot of q 2 I(q) versus q. 60 The first minimum of this plot q corresponds to the first zero of the membrane factor given by: ݀ = ‫ݍ/ߨ2‬ where d is the membrane thickness. Such a plot gave a thickness of 38.3 nm ( Figure S4).…”

Section: Effect Of Solventmentioning

confidence: 99%

Section: Effect Of Solventmentioning

confidence: 99%

RAFT dispersion polymerization: a method to tune the morphology of thymine-containing self-assemblies

et al. 2015

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The synthesis and self-assembly of thymine-containing polymers were performed using RAFT dispersion polymerization. A combination of microscopy and scattering techniques was used to analyze the resultant complex morphologies. The primary observation from this study is that the obtained aggregates induced during the polymerization were well-defined despite the constituent copolymers possessing broad dispersities. Moreover, a variety of parameters, including the choice of polymerization solvent, the degree of polymerization of both blocks and the presence of an adenine-containing mediator, were observed to affect the resultant size and shape of the assembly.

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Structural changes in liquid crystal polymer vesicles induced by temperature variation and magnetic fields

Abstract: International audienceno abstrac

Cited by 26 publications

References 48 publications

Soft Matter Sample Environments for Time-Resolved Small Angle Neutron Scattering Experiments: A Review

Soft Matter Sample Environments for Time-Resolved Small Angle Neutron Scattering Experiments: A Review

Stimuli-Responsive Polymersomes

RAFT dispersion polymerization: a method to tune the morphology of thymine-containing self-assemblies

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