Rheology and silver nanoparticle templating in a bis(urea) silver metallogel

Piepenbrock, Marc‐Oliver M.; Clarke, Nigel; Steed, Jonathan W.

doi:10.1039/c0sm00647e

Cited by 112 publications

(91 citation statements)

References 41 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…394 For example, Piepenbrock et al observed that weak strain overshoots in silver(I) metallogels of a pyridylfunctionalised bis(urea) correlate with larger Gʹ values, lower yield stresses and higher densities of silver nanoparticles, and may be enhanced by UV irradiation or increased silver loadings. 395 Yu et al, meanwhile, noted that a rise in G″ during the shear-induced collapse of a toluene gel of 39 coincides with the fragmentation of nano-ring structures, which can reassemble on resting to restore the original gel network (Fig. 42).…”

Section: Gels Under Stressmentioning

confidence: 99%

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

2016

Self Cite

View full text Add to dashboard Cite

. (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.

show abstract

Section: Gels Under Stressmentioning

confidence: 99%

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

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…1a). 42, 43 45 Addition of a co-gelator such as a metal ion 38,[44][45][46] or halogen bond donor 47 results in coordination to the pyridyl nitrogen atom hence freeing the urea functionality and switching the system from the urea-pyridyl hydrogen bonding motif to the gel-forming urea -tape. Related work by the Dastidar group has shown that co-gels 55 comprising the simple N,N'-di-(n-pyridyl) urea (n = 3 or 4) in conjunction with carboxylic acids also produces a range of composite materials, some of which form gels and others of which are crystalline.…”

mentioning

confidence: 99%

Triggered formation of thixotropic hydrogels by balancing competitive supramolecular synthons

Liu

Steed

2013

Soft Matter

Self Cite

View full text Add to dashboard Cite

Publisher's copyright statement: 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. Two component hydrogels have been obtained by formation of 1:1 complexes of bis(pyridyl urea)s with a range of dicarboxylic acids. The gels are thixotropic and undergo an assembly process in which short segments can reversibly assemble into an interconnected fibrous network. NMR and IR spectroscopic data suggest that the gelators form neutral gelator-acid complexes rather than salts. The use of dicarboxylic acids to trigger gelation in bis(pyridyl urea)s parallels analogous triggered gelation of metal 10 ions and halogen bond donors in related systems. IntroductionGels derived from low molecular weight gelators (LMWG) have experienced an explosion of interest in recent years. 14 The growing interest in their properties stems from their generally facile synthesis, their synthetic and structural versatility, and the possibility of adaptive or reversible gelation offered by the weak, dynamic supramolecular interactions holding the fibres together. 7 The 25 mechanism of the non-equilibrium self-assembly process involved in gel formation by LMWG is also fascinating from a fundamental viewpoint and is perhaps a more tractable problem in well-defined small molecules than in more conventional silica or biopolymer based hydrogels. Of particular current interest are 30 multicomponent gels. 25These systems may comprise stoichiometric co-gels in which two non-gelator components combine in a well-defined way to produce a gel-forming supermolecule, or they may be blends of LMWG (sometimes termed 'multi-gelator gels') that are individually gelators. 26-32 35 Some metallogels arising from metal cross-linking of gelating ligands, 4,6, 33 or anion influenced gels also fall into the broad category of multicomponent gels. [34][35][36] In previous work we have looked at triggered gelation in 'inhibited gelators', particularly pyridyl ureas. 37,38 Intramolecular CH O interactions coupled 40 with the good hydrogen bond acceptor ability of the pyridyl nitrogen atom make pyridyl ureas particularly poor gelators (Fig. 1b) 37, 39-41 because they cannot effectively form the typical urea -tape motif generally thought to be responsible for onedimensional fibre growth and hence gel formation (Fig. 1a). 42, 43 45 Addition of a co-gelator such as a metal ion 38,[44][45][46] or halogen bond donor 47 results in coordination to the pyridyl nitrogen atom hence freeing the urea functionality and switching the system from the urea-pyridyl hydrogen bonding motif to the ...

show abstract

“…Due to above points, metal-organic gels have amounts of potential applications in catalysis, [11] sensing, [12] anion recognition, [13] photophysics, [14,15] vapor adsorption, [16] separation technologies, electrochemical detection, [17] etc. Conformationally flexible ligands with amide groups [18][19][20] have been often employed to design metal-organic gels because the formed networks are able to trap solvent molecules in their crystal lattices. However, because the structures of most ligands are complex with multi-step procedure, the synthesis and functional researches of metal-organic gels are still rarely reported up to date.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Highly Stable Porous Metal‐Iminodiacetic Acid Gels from A Novel IDA Compound

et al. 2016

View full text Add to dashboard Cite

In this work, a novel and simple flexible aromatic multi-carboxylate compound N,N'-(4,4'-biphenylyl) iminodiacetic acid (BP-IDA) was synthesized, with which two new stable metal-IDA gels (denoted as MIG1 and MIG2) with three-dimensional network structures have been prepared successfully by employing Cr 3＋ and Al 3＋ as the metal ions, respectively. The rheological performance was investigated by means of dynamic rheology measurement. The morphology and microstructure were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction technique. Nitrogen sorption isotherm measurement suggests that the MIG1 aerogel has considerable porosity with the Brunauer-Emmett-Teller specific surface area up to 760 m 2 •g 1 . Owingto easy preparation, good stability, and three-dimensional network structure, the as-prepared metal-organic gels will possess potential applications in separation, catalysis, and drug delivery.

show abstract

Rheology and silver nanoparticle templating in a bis(urea) silver metallogel

Cited by 112 publications

References 41 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

Triggered formation of thixotropic hydrogels by balancing competitive supramolecular synthons

Synthesis of Highly Stable Porous Metal‐Iminodiacetic Acid Gels from A Novel IDA Compound

Contact Info

Product

Resources

About