Cover Picture: Sugar‐Derived Phase‐Selective Molecular Gelators as Model Solidifiers for Oil Spills (Angew. Chem. Int. Ed. 42/2010)

Jadhav, Swapnil R.; Vemula, Praveen Kumar; Kumar, Rakesh; Raghavan, Srinivasa R.; John, George

doi:10.1002/anie.201004589

Cited by 41 publications

(49 citation statements)

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“…[1][2][3][4][5][6][7][8][9][10][11][12] Among the ve nucleosides, guanosine-based self-assembly into a G-quadruplex has been exploited in areas as diverse as supramolecular chemistry and nanobiotechnology. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] Although metal ion induced guanosine-based G-quadruplex and hydrogel formation has been rst reported in the early 1960s, only a small number of metal ions (Na + , K + and Ag + ) are known to contribute to gel formation with guanosine (or guanosine analogues) via G-quadruplex formation.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of guanosine and deoxy-guanosine into hydrogels: monovalent cation guided modulation of gelation, morphology and self-healing properties

2014

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+ on the stimulation of purine nucleosides guanosine (G) and deoxy-guanosine (dG) to self-assemble into hydrogels. The gelation properties in terms of gel crystallization, lifetime stability, thermo-reversibility, minimum gelation concentration, gel melting temperature, thixotropic property and others were thoroughly investigated and compared not only between two nucleosides but also among different metal ions. A few metal ions were found to induce G/dG to form gels with much improved lifetime stability. The results revealed that dG is a much better gelator than G for introduction of a thixotropic property. Interestingly, morphological, fluorescence and rheological (thixotropic) properties of the gels were found to modulate significantly by changing the metal ions. In the presence of K + ions, G produces a self supporting tight gel but it has poor lifetime stability. In contrast, the presence of K + ions stimulates dG to form a very loose gel but with excellent lifetime stability and thixotropic property. In this context, we have successfully engineered a self-supporting stable co-gel using a simple co-gelation method by mixing an equimolar amount of K + induced G and dG gels and this co-gel shows long lifetime stability, self-healing and injectable properties which may allow for a broad range of biological applications.Furthermore, an Ag + induced G gel was exploited for the light triggered in situ fabrication of uniform AgNPs within a gel to make a nano-bio hybrid material.

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Section: Introductionmentioning

confidence: 99%

Self-assembly of guanosine and deoxy-guanosine into hydrogels: monovalent cation guided modulation of gelation, morphology and self-healing properties

2014

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“…John's group synthesized phase-selective gelators via an environmentally benign method (enzymatic reaction) using sugars and fatty acid vinyl esters, which are inexpensive ingredients. [13] These LMWGs 10a, 10b formed molecular gels even in two-phase mixtures of oil and sea water. Furthermore, John's group achieved the gelation of an oil-water mixture at room temperature by adding an aliquot of a high concentration gelator in ethanol (as a water-miscible cosolvent).…”

Section: Lmwgs For Oil Solidificationmentioning

confidence: 99%

“…[13,14] First, the gelators must selectively form organogels in the presence of water to enable easy collection and recovery of the spilled oil. Preparation of the LMWGs must also be possible using inexpensive, readily available ingredients and a simple, inexpensive synthetic process.…”

Section: Lmwgs For Oil Solidificationmentioning

confidence: 99%

Low-molecular-weight organogelators as functional materials for oil spill remediation

Ohsedo

2015

Polym. Adv. Technol.

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Oil spills from tankers are one of the major types of man-made disasters that impact the marine environment, and they have been shown to have long-lasting effects. On prevention of the spread of oil through rapid cleanup of spills, low-molecular-weight organogelators have received much attention because of their ability to tune their properties through rational design. In this mini-review, I present a brief summary of studies focused on the remediation of oil spills via a chemical method, which involves the use of low-molecular-weight organogelators that form organogels with fuel oils or organic solvents. Moreover, recent attempts to create new improved molecular organogels composed of commercially available simple organogelators via a mixing induced enhancement method for solidifying oil are also discussed. In addition, polymer organogelators for oil spills are discussed in relation to low-molecular weight gelators.

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“…For instance, booms do not necessarily remove the oil, high-pressure hot water disrupts the microbial populations, burning may be impossible in bad weathers or when too close to the shoreline, and polymeric solidifiers are generally derived from non-renewable resources and difficult in terms of recovering the crude oil from the resulting gel. 11,12 …”

Section: Introductionmentioning

confidence: 99%

Sugar based amphiphiles: easily accessible and efficient crude oil spill thickening agents

et al. 2016

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In this work, we demonstrate the use of biomass for the catalytic production of phase-selective gelators (PSGs) as a cost-effective, environmentally benign and ideal method for crude oil spill remediation, as well as execute the study exclusively in crude oil. The use of PSGs has recently provided great promise relative to that of their traditional counterparts. However, the use of PSGs with crude oil is much more complicated due to its complex composition. All of the current PSG methods are demonstrated with refined oils or do not employ eco-friendly methods like enzymatic synthesis. Our current project entails studying sugar alcohol-derived amphiphiles for their phase-selective gelation in crude oil; the PSGs are derived from renewable, benign materials and synthesized via a simple, single-step, enzymatic catalysis that required no purification. The results showed that, after a rigorous and systematic testing, the mannitol-derived amphiphile using 8-carbon alkyl chain length (M-8) turned out to be the best crude oil PSG among the studied amphiphiles. M-8 demonstrated a versatility towards thickening of different crude oil types, an efficient ability towards selective gelation of the oil (forming crude oil gel that is over sixty-one-times its mass and stable up to 109.7 °C) in a crude oil/water mixture, and an ability to form gel under practical situations such as seawater conditions. These qualities, in addition to the use of a simple and environmentally benign method to synthesize the structuring agents, make this amphiphile very practical in real life application.

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Cover Picture: Sugar‐Derived Phase‐Selective Molecular Gelators as Model Solidifiers for Oil Spills (Angew. Chem. Int. Ed. 42/2010)

Cited by 41 publications

References 0 publications

Self-assembly of guanosine and deoxy-guanosine into hydrogels: monovalent cation guided modulation of gelation, morphology and self-healing properties

Self-assembly of guanosine and deoxy-guanosine into hydrogels: monovalent cation guided modulation of gelation, morphology and self-healing properties

Low-molecular-weight organogelators as functional materials for oil spill remediation

Sugar based amphiphiles: easily accessible and efficient crude oil spill thickening agents

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