Novel dimeric cholesteryl-based A(LS)2 low-molecular-mass gelators with a benzene ring in the linker

Xue, Min; Liu, Kaiqiang; Peng, Junxia; Zhang, Liqun; Fang, Yu

doi:10.1016/j.jcis.2008.08.012

Cited by 31 publications

(28 citation statements)

References 39 publications

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“…SLB ¼ 0.5 expressed that the liquid and solid parts are equal, known as sol-gel transition point, 0.5 < SLB < 1 expressed the liquid behaviour dominating, and 0 < SLB < 0.5 expressed the solid behaviour dominating, which was gel behaviour. 47 As shown in Fig. 4, SLB curves nally remained below 0.5 and above 0 at 25 C, 45 C, 65 C, 85 C, which declared the solid behaviour dominated.…”

Section: Rheological and Micro-rheological Studiesmentioning

confidence: 67%

Preparation and investigation of temperature-responsive calix[4]arene-based molecular gels

Cai

Rong

et al. 2017

RSC Adv.

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A novel calix [4]arene-based tetracholesteryl derivative was synthesized, and its gelation behaviours in 30 organic solvents were studied. It showed that 1 gelled long chain alkane, some of alcohol, kerosene, ethyl acetate benzene and toluene. Interestingly the gel of 1/kerosene possessed special property, which was that the mixture solution of the compound 1/kerosene heating for a while was put on the flat contact heater and formed a gel film at 25 C and 65 C. Unlike ordinary film, gel film had higher strength and toughness at 65 C, by contrast other was fragile and broken easily at 25 C, this phenomenon was few reported before. In order to explore the phenomenon, the mechanism of the gel of 1/kerosene was discussed by Scanning Electron Microscope (SEM), High Nuclear Magnetic Resonance (H NMR), Fourier Transform Infrared Spectrometer (IR) and micro-rheology. SEM revealed that the xerogel of 1/kerosene assembled network through some long and thick fibers at 65 C, with concentration reducing fibers become thin and its networks were clearly observed. In contrast the morphology of xerogel was porous at low concentration and was a bulk at high temperature system.According to EI data in micro-rheology, the gelation process could be divided into three stages at 65 C and they could be that some cholesterol segments in the gelator interacting with each other formed some small aggregation in the first stage, and other cholesterol section of the gelator sufficiently were cross-linked with time and assembled into large assembly in the second plateau. In the final moment the large assembly build gel network and the system of gel tended to stable. But there are two stages at low temperature and could be some cholesterol segments that didn't take part in assembly, which may be the cause that the performance of gel was fragile.

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Section: Rheological and Micro-rheological Studiesmentioning

confidence: 67%

Preparation and investigation of temperature-responsive calix[4]arene-based molecular gels

Cai

Rong

et al. 2017

RSC Adv.

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“…Interestingly, in addition to the systems discussed above, in which in situ gelation at room temperature was triggered by a chemical reaction, gelation at room temperature by direct addition of some LMMGs was also reported [24][25][26][27][28]. As an example [24], a dicholesteryl derivative with the LS 2 structure (16) gels triethylamine, butyl acetate, n-heptane, n-octane, n-nonane, n-decane, and some commercial oils (e.g.…”

Section: Gelation At Room Temperaturementioning

confidence: 96%

“…Recently, Fang et al synthesized another series of cholesterol-based gelators with the structure of A(LS) 2 , where A stands for a benzene unit [26]. Gelation tests revealed that compound 22 gels xylene at a concentration of 2.5 wt/vol% and at room temperature.…”

Section: Gelation At Room Temperaturementioning

confidence: 99%

“…All the gelators created are cholesterol derivatives [25,26]. As an example, compound 19 possesses a structure of LS 2 type, and displays a remarkable selective gelation of xylene from its mixture with water at room temperature, and neither heating nor addition of co-solvent is necessary.…”

Section: Phase-selective Gelationmentioning

confidence: 99%

“…can also be used to achieve a gelation process [13][14][15][16][17][18][19]. Specifically, some LMMGs can gel some specific solvents rapidly by simply mixing them at room temperature [24][25][26][27][28][29], and others can even selectively gelate certain solvents from their un-miscible mixtures with other solvents at room temperature [25,27]. Furthermore, LMMGs-based gel emulsions and supramolecular gel films have also been reported during the past few years [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Progress in the studies of low-molecular mass gelators with unusual properties

Liu

Fang

2011

Sci. China Chem.

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This article is intended to provide an overview of recent progress in the studies of cholesterol-based low-molecular mass gelators (LMMGs) with unusual properties, in particular, gelation and selective gelation at room temperature, gel emulsions and gel film formation, etc. Potential applications of the LMMGs in spilled oil collection and water purification are briefly presented.gelation at room temperature, selective gelation, gel emulsions, gel films

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