Modulation of Viscoelastic Properties of Physical Gels by Nanoparticle Doping: Influence of the Nanoparticle Capping Agent

Bhattacharya, Santanu; Srivastava, Aasheesh; Pal, Asish

doi:10.1002/anie.200504461

Cited by 161 publications

(66 citation statements)

References 50 publications

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“…S14, ESI †) and suggests the formation of a typical 'soft-solid like' gel phase material. 10 It is consistent with the observations made from gel lifting up in the vial upon heating at 75 1C as well as supports the variable temperature fluorescence studies.…”

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confidence: 91%

Li+-induced selective gelation of discrete homochiral structural isomers derived from l-tartaric acid

et al. 2014

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Two chiral structural isomers have been synthesized by molecular engineering of L-tartaric acid. In the presence of LiOH isomer forms a thermally stable, fluorescent gel which exhibits interesting nano-cluster morphology, anomalous optical and rheological properties whilst forms a non-fluorescent solution under similar conditions. The current-voltage (I-V) curve followed a non-linear trend, rationally in close proximity to the diode characteristic curve.

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supporting

confidence: 91%

Li+-induced selective gelation of discrete homochiral structural isomers derived from l-tartaric acid

et al. 2014

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“…The organization and properties of such gels can be modulated by the incorporation of nanoparticles or -tubes. [24][25][26][27] We have reported different instances of the preparation of new gel-nanotube composites from a nonchromophoric organogelator based on fatty acid amides of l-alanine (2) [25] and also a chromophoric organogelator based on a tri-p-phenylenevinylene (TPV; 1) moiety with single-walled carbon nanotubes (SWNTs) [26] and boron nitride nanotubes (BNNTs). [27] These showed the tunability of the nanocomposites in terms of optical, thermal, and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Composites of Graphene and Other Nanocarbons with Organogelators Assembled through Supramolecular Interactions

Samanta

Subrahmanyam

Bhattacharya

et al. 2012

Chemistry A European J

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Carbon nanomaterials (CNMs), such as exfoliated graphene (EG), long-chain functionalized EG, single-walled carbon nanotubes (SWNTs), and fullerene (C(60)), have been investigated for their interaction with two structurally different gelators based on all-trans tri-p-phenylenevinylene bis-aldoxime (1) and n-lauroyl-L-alanine (2) both in solution and in supramolecular organogels. Gelation occurs in toluene through hydrogen bonding and van der Waals interactions for 1 and 2 in addition to π-π stacking specifically in the case of 1. These nanocomposites provide a thorough understanding in terms of molecular-level interactions of dimensionally different CNMs with structurally different gelators. The presence of densely wrapped CNMs encapsulated fibrous network in the resulting composites is evident from various spectroscopic and microscopic studies, indicating the presence of supramolecular interactions. Concentration- and temperature-dependent UV/Vis and fluorescence spectra show that CNMs promote aggregation of the gelator molecules, leading to hypochromism and quenching of the fluorescence intensity. Thermotropic mesophases of 1 are altered by the inclusion of a small amount of CNMs. The gel-CNM composites show increased electrical conductivity compared with that of the native organogel. Rheological studies of the composites demonstrate the formation of rigid and viscoelastic solidlike assembly due to reinforced aggregation of the gelators on CNMs. Synergistic behavior is observed in case of the composite gel of 1, containing a mixture of EG and SWNT, when compared with other mixtures of CNMs in all combinations with EG. This affords new nanocomposites with interesting optical, thermal, electrical, and mechanical properties.

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“…[9] Xu et al has utilized molecular recognition to enhance the elasticity of a small-molecule hydrogel, [9] whereas Bhattacharya et al combined a weak gel with gold nanoparticles to modulate the viscoelastic properties. [10] We know that the elasticity of polymers, [11] cell membranes, [12] and clays [13] can be changed by external pH values. However, little attention has been paid to tuning the viscoelasticity of a small-molecule gel via external stimuli, even though the rheological properties are valuable for achieving practical applications.…”

Section: Introductionmentioning

confidence: 99%

A Smart Supramolecular Hydrogel Exhibiting pH‐Modulated Viscoelastic Properties

Shi

Dong

Yin

et al. 2007

Adv Funct Materials

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The macroscopic viscoelastic properties of a physical hydrogel are reversibly modulated by tuning the microscopic hydrogen‐bonding interactions with pH. The hydrogel forms at a rather low concentration of the multi‐pyridyl‐based gelator, N, N′, N″‐tris(3‐pyridyl)trimesic amide. The yield stress of the hydrogel is greatly enhanced from 10 to 769 Pa by changing the pH from 7.0 to 5.0. At pH 7.0, the amide molecules are assembled into an ordered structure as a result of the hydrogen bonds between the amide N–H bond and the nitrogen on the pyridyl group (N–H…Py). Fourier transform (FT) IR spectroscopy indicates that hydrogen bonds of N–H…Py are partially broken because the pyridyl groups are partly protonated at pH 5.0. This condition leads to a highly branched and homogeneous fibrillar network, which is confirmed by X‐ray diffraction (XRD) measurements and field‐emission scanning electron microscopy (FESEM) images. Highly branched fibrillar networks create more compartments and greatly increase the interfacial tension that is required to hold the solvent in the gel, thereby increasing the yield stress to 769 Pa. By further increasing the acidity of the hydrogel to pH < 3.0, the gel becomes a sol. Both the change in the viscoelastic properties and the sol–gel transition are reversible and controllable in the material.

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Modulation of Viscoelastic Properties of Physical Gels by Nanoparticle Doping: Influence of the Nanoparticle Capping Agent

Cited by 161 publications

References 50 publications

Li+-induced selective gelation of discrete homochiral structural isomers derived from l-tartaric acid

Li+-induced selective gelation of discrete homochiral structural isomers derived from l-tartaric acid

Composites of Graphene and Other Nanocarbons with Organogelators Assembled through Supramolecular Interactions

A Smart Supramolecular Hydrogel Exhibiting pH‐Modulated Viscoelastic Properties

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