Irradiation-induced fusion between giant vesicles and photoresponsive large unilamellar vesicles containing malachite green derivative

Uda, Ryoko M.; Yoshikawa, Yuki; Kitaba, Moe; Nishimoto, Noriko

doi:10.1016/j.colsurfb.2018.04.061

Cited by 5 publications

(4 citation statements)

References 49 publications

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“…Self-assembly and disintegration of supramolecular assemblies driven by light is another issue of supramolecular photochemistry. Examples include photoinduced fusion, disintegration, and rearrangement of azopyridine-containing diblock copolymeric vesicles, the fusion of lipid vesicles through the use of a photosensitive surfactant containing an azobenzene moiety, irradiation-induced fusion between giant vesicles and photoresponsive smaller vesicles containing malachite green derivative, etc. Kundu et al reported light-driven self-assembly of gold nanoparticles decorated with photoswitchable azobenzenes and dissolved in a nonpolar solvent of toluene .…”

Section: Current Challenges and Future Directionsmentioning

confidence: 99%

Dynamics of Excitons in Conjugated Molecules and Organic Semiconductor Systems

Dimitriev

2022

Chem. Rev.

108

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The exciton, an excited electron–hole pair bound by Coulomb attraction, plays a key role in photophysics of organic molecules and drives practically important phenomena such as photoinduced mechanical motions of a molecule, photochemical conversions, energy transfer, generation of free charge carriers, etc. Its behavior in extended π-conjugated molecules and disordered organic films is very different and very rich compared with exciton behavior in inorganic semiconductor crystals. Due to the high degree of variability of organic systems themselves, the exciton not only exerts changes on molecules that carry it but undergoes its own changes during all phases of its lifetime, that is, birth, conversion and transport, and decay. The goal of this review is to give a systematic and comprehensive view on exciton behavior in π-conjugated molecules and molecular assemblies at all phases of exciton evolution with emphasis on rates typical for this dynamic picture and various consequences of the above dynamics. To uncover the rich variety of exciton behavior, details of exciton formation, exciton transport, exciton energy conversion, direct and reverse intersystem crossing, and radiative and nonradiative decay are considered in different systems, where these processes lead to or are influenced by static and dynamic disorder, charge distribution symmetry breaking, photoinduced reactions, electron and proton transfer, structural rearrangements, exciton coupling with vibrations and intermediate particles, and exciton dissociation and annihilation as well.

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Section: Current Challenges and Future Directionsmentioning

confidence: 99%

Dynamics of Excitons in Conjugated Molecules and Organic Semiconductor Systems

Dimitriev

2022

Chem. Rev.

108

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“…Similar to electroformation, the concentrations of amphiphiles varies from 1–4 mg mL −1 for lipids and 3–5 mg mL −1 for polymers of M n from 3000 to 8000 g mol −1 or is sometimes not specified. Gel‐assisted hydration is fast, requires up to 1 h, contrasting with electroformation which exhibits greater variation in reported times (5 min to overnight) and generally takes several hours or longer for gentle hydration . Several gel‐assisted hydration protocols even obtain GUVs within 30 min .…”

Section: Methodsmentioning

confidence: 99%

“…The mechanism behind gentle hydration is the entropically favored spontaneously self‐assembly of amphiphiles into GUVs in an aqueous environment (Figure A). This method is however only rarely described, as the formation of GUVs requires long swelling times (typically several hours to days), might not be sufficient for many amphiphiles and forms multilamellar deformed vesicles . In 2005, Rodriguez et al described a successful gentle hydration of the zwitterionic 1,2‐dioleoyl‐sn‐glycero‐3‐phosphocholine (DOPC) from a Teflon surface .…”

Section: Gentle Hydrationmentioning

confidence: 99%

Self‐Assembly of Giant Unilamellar Vesicles by Film Hydration Methodologies

2019

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Self‐assembly of lipids or polymeric amphiphiles into vesicular structures has been achieved by various methods since the first generation of liposomes in the 1960s. Vesicles can be obtained with diameters from the nanometer to the micrometer regime. From the perspective of cell mimicking, vesicles with diameters of several micrometers are most relevant. These vesicles are called giant unilamellar vesicles (GUVs). Commonly used methods to form GUVs are solvent‐displacement techniques, especially since the development of microfluidics. These methodologies however, trap undesirable organic solvents in their membrane as well as other potentially undesired additives (surfactants, polyelectrolytes, polymers, etc.). In contrast to those strategies, summarized herein are solvent‐free approaches as suitable clean alternatives. The vesicles are formed from a dry thin layer of the lipid or amphiphilic polymers and are hydrated in aqueous media using the entropically favored self‐assembly of amphiphiles into GUVs. The rearrangement of the amphiphilic films into vesicular structures is usually aided by shear forces such as an alternative current (electroformation) or the swelling of water‐soluble polymeric supports (gel‐assisted hydration).

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“…[5][6][7] However, obtaining detailed information on the kinetic behavior of molecules on lipids and understanding its influence on the structural evolution of lipid bilayers are challenging. Techniques such as dark-field microscopy, 8,9 cryo-transmission electron microscopy (cryo-TEM), 10 dynamic light scattering (DLS), 11 fluorescence resonance energy transfer (FRET), 12 isothermal titration calorimetry 13 and fluorescence microscopy 14,15 have been applied for investigating the interaction of various molecules with lipid vesicles. For example, Nomura et al investigated the dynamic behavior of vesicles caused by various surfactants using high-intensity dark-field microscopy and found that vesicles exposed to surfactants exhibited unusual behavior, including continuous shrinkage, opening up and inside-out topological inversion.…”

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confidence: 99%