Ultrasound-induced controllable morphology and growth dimension in a dihydrazide-based self-assembly system

Zhang, Yan; Ding, Hao; Wu, Yuehong; Zhang, Chunxue; Bai, Binglian; Wang, Haitao; Li, Min

doi:10.1039/c4sm01331j

Cited by 27 publications

(24 citation statements)

References 42 publications

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“…453 Adopting a fluorescence-based approach, Zhang et al likewise demonstrated that an ethanol sonogel of 45, with a typical Df of 1.88, is more highly branched than a comparable thermal material, with Df in the range 0.99-1.15. 452 Interestingly, despite their superior connectivity, the sonogels are significantly less stable to both heat and mechanical stress, displaying lower values of Gʹ and Tgel than the materials.…”

Section: Multiaddressable Systemsmentioning

confidence: 99%

“…48). 452 In this case, however, differences in microstructure and molecular packing may be eliminated by conducting the sonication treatment at higher temperatures or for shorter periods of time. Sonication at 35 o C gave rise to a 37% monoclinic sonogel with a contact angle of 146.7 o in the xerogel state, whilst treatment at 60 o C produced no detectable monoclinic component and a contact angle of 111.2 o , approaching the value of 122.1 o measured in the absence of ultrasound.…”

Section: Multiaddressable Systemsmentioning

confidence: 99%

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Gels with sense: supramolecular materials that respond to heat, light and sound

2016

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. (2016) 'Gels with sense : supramolecular materials that respond to heat, light and sound.', Chemical society reviews., 45 (23). pp. 6546-6596. Further information on publisher's website:https://doi.org/10.1039/C6CS00435KPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Advances in the field of supramolecular chemistry have made it possible, in many situations, to reliably engineer soft materials to address a specific technological problem. Particularly exciting are "smart" gels that undergo reversible physical changes on exposure to remote, non-invasive environmental stimuli. This review explores the development of gels which are transformed by heat, light and ultrasound, as well as other mechanical inputs, applied voltages and magnetic fields. Focusing on small-molecule gelators, but with reference to organic polymers and metal-organic systems, we examine how the structures of gelator assemblies influence the physical and chemical mechanisms leading to thermo-, photo-and mechano-switchable behaviour. In addition, we evaluate how the unique and versatile properties of smart materials may be exploited in a wide range of applications, including catalysis, crystal growth, ion sensing, drug delivery, data storage and biomaterial replacement.

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Section: Multiaddressable Systemsmentioning

confidence: 99%

Section: Multiaddressable Systemsmentioning

confidence: 99%

Gels with sense: supramolecular materials that respond to heat, light and sound

2016

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“…Note that at early stage of gelation, the initial fluorescences ilence was observed (< 1.8 min) andt hen, fluorescence emission intensity increased drastically and finally reached am aximum value. [44] The above resultsp roved furthert hat the p-p interactions is athe main drivingf orce.…”

Section: Fluorescence Properties Of the Gelsmentioning

confidence: 73%

Poly(aryl ether) Dendrons with Monopyrrolotetrathiafulvalene Unit‐Based Organogels exhibiting Gel‐Induced Enhanced Emission (GIEE)

Liu

Lei

Chen

et al. 2015

Chemistry A European J

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A series of poly(aryl ether) dendrons with a monopyrrolo-tetrathiafulvalene unit linked through an acyl hydrazone linkage were designed and synthesized as low molecular mass organogelators (LMOGs). Two of the dendrons could gelate the aromatic solvents and some solvent mixtures, but the others could not gel all solvents tested except for n-pentanol. A subtle change on the molecular structure produces a great influence on the gelation behavior. Note that the dendrons could form the stable gel in the DMSO/water mixture without thermal treatment and could also form the binary gel with fullerene (C60 ) in toluene. The formed gels undergo a reversible gel-sol phase transition upon exposure to external stimuli, such as temperature and chemical oxidation/reduction. A number of experiments (SEM, FTIR spectroscopy, (1) H NMR spectroscopy, and UV/Vis absorption spectroscopy, and XRD) revealed that these dendritic molecules self-assembled into elastically interpenetrating one-dimensional fibrillar aggregates and maintain rectangular molecular-packing mode in organogels. The hydrogen bonding, π-π, and donor-acceptor interactions were found to be the main driving forces for formation of the gels. Moreover, the gel system exhibited gel-induced enhanced emission (GIEE) property in the visible region in spite of the absence of a conventional fluorophore unit and the fluorescence was effectively quenched by introduction of C60 .

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“…The frequency sweep test [Figure (b)] shows that initially both G ′ and G ″ were very small indicating a low viscosity, but after the intersection point, that is, the conversion from solid‐like to liquid‐like phase, both G ′ and G ″ increased and at the equilibrium G ′ value was much larger than G ″ . This confirms the predominance of elastic behavior over viscous effect at high temperature.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of ethylene and butyl methacrylate‐based copolymer by emulsion polymerization

Borphukan

Saikia

Baruah

et al. 2019

J of Applied Polymer Sci

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The emulsion copolymerization of ethylene with butyl methacrylate (BMA) was carried out in an aqueous medium at 60 °C under moderate reaction conditions. The polymer system is well controlled with a linear increase in the molecular weight (Mn) versus ethylene feed pressure and narrow molecular weight distributions (>1.36) were observed throughout the copolymerization reaction. The spectroscopic analyses confirm the presence of acrylate functional as well as methylene group in the synthesized poly(ethylene‐co‐BMA) copolymer. Morphological behavior of poly(ethylene‐co‐BMA) has been studied using SEM and TEM analyses. Thermal stability of the copolymers was investigated by thermogravimetric analysis and it was observed that the copolymer is stable up to 380 °C. X‐ray diffraction analysis confirmed the amorphous behavior of poly(ethylene‐co‐BMA). Dynamic light scattering measurement confirms the formation of poly(ethylene‐co‐BMA) nanoparticles. The particle size of copolymer nanoparticles were in the range of 85–108 nm with low polydispersity indexes (>0.2). The viscous and the elastic property of the copolymer were investigated and established that at high temperature elastic behavior predominant over viscous effect. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47994.

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Ultrasound-induced controllable morphology and growth dimension in a dihydrazide-based self-assembly system

Cited by 27 publications

References 42 publications

Gels with sense: supramolecular materials that respond to heat, light and sound

Gels with sense: supramolecular materials that respond to heat, light and sound

Poly(aryl ether) Dendrons with Monopyrrolotetrathiafulvalene Unit‐Based Organogels exhibiting Gel‐Induced Enhanced Emission (GIEE)

Synthesis of ethylene and butyl methacrylate‐based copolymer by emulsion polymerization

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