Dual-component cholesterol-based gelators bearing complementary hydrogen-bonding sites

Jeong, Sang Won; Murata, Kazutaka; Shinkai, Seiji

doi:10.1016/0968-5677(96)00021-1

Cited by 67 publications

(48 citation statements)

References 23 publications

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“…at 35.5 K, an unprecedented temperature for an organic radical. [7] Our oriented thin films were obtained by evaporating the a-, b-, and g-phase of the p-NPNN radical [8] in vacuum using glass and cleaved NaCl(001) as substrates, which are held at room temperature. [9] Figure 1 shows a standard Xray diffraction (XRD) pattern of a~2 mm thick film grown from a g-phase precursor on a cleaved NaCl(001) substrate.…”

Section: Methodsmentioning

confidence: 99%

Gelation of Room-Temperature Liquid Crystals by the Association of atrans-1,2-Bis(amino)cyclohexane Derivative

Kato¹,

et al. 1998

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holding ratio of TFT (thin film transistor) LC mixtures. For this reason and because of their low birefringence and favorable mesogenic properties, these new substances are quite attractive as a polar component of liquid-crystal mixtures for active matrix displays with shorter switching times and lower power consumption. [12] T NI,extr , De, Dn, and g 1 were determined by linear extrapolation from a 10 wt.-% solution in the commercially available Merck mixture ZLI-4792 (T NI = 92.8 C, e = 5.27, Dn = 0.0964) as a standard host. For the pure substances the mesophases were identified by optical microscopy, and the phase transition temperatures by differential scanning calorimetry (DSC).

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Section: Methodsmentioning

confidence: 99%

Gelation of Room-Temperature Liquid Crystals by the Association of atrans-1,2-Bis(amino)cyclohexane Derivative

Kato¹,

et al. 1998

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“…Increasing attention has been paid to low molecular-mass compounds that can gelatinize various organic solvents efficiently. [1][2][3][4][5][6][7][8][9][10][11] These phenomena are interesting in that the fibrous aggregates formed by non-covalent interactions are responsible for the gelation. In particular, cholesterol-based gelators, which can form stable gels using only non-hydrogen-bonding interactions, show an excellent gelation ability towards a wide variety of organic solvents at sufficiently low concentrations.…”

mentioning

confidence: 99%

Organic gels are useful as a template for the preparation of hollow fiber silica

et al. 1998

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“…More recently, various LMOGs tripeptoids with glucosamine, cyclohexyl, ethyl glycine and 1deoxyglucose functional structures were distinctly studied for their gelation versatility [22][23][24][25][26][27][28]. Among various supramolecular gelators, cholesterol-based organogelators are remarkably attractive due to their synthetic tunability and gelation ability [29][30][31][32][33]. Kawano et al developed pyridinecontaining cholesterol compounds, and explored their gelation ability in various organic solvents, claiming that pyridine shows versatile solubility in both protic and aprotic solvents (including water and cyclohexane).…”

Section: Introductionmentioning

confidence: 99%

Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction

2020

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Two xerogels made of 4-pyridyl cholesterol (PC) and silver-nanocomposites (SNCs) thereof have been studied for their efficient reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of aqueous sodium borohydride. Since in-situ silver doping will be effective in ethanol and acetone solvents with a PC gelator, two silver-loaded PC xerogels were prepared and successive SNCs were achieved by using an environmentally benign trisodium citrate dehydrate reducing agent. The formed PC xerogels and their SNCs were comprehensively investigated using different physico-chemical techniques, such as field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), powdered X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-Vis). The FE-SEM results confirm that the shape of xerogel-covered silver nanoparticles (SNPs) are roughly spherical, with an average size in the range of 30–80 nm. Thermal degradation studies were analyzed via the sensitive graphical Broido’s method using a TGA technique. Both SNC-PC (SNC-PC-X1 and SNC-PC-X2) xerogels showed remarkable catalytic performances, with recyclable conversion efficiency of around 82% after the fourth consecutive run. The apparent rate constant (kapp) of SNC-PC-X1 and SNC-PC-X2 were found to be 6.120 × 10-3 sec-1 and 3.758 × 10-3 sec-1, respectively, at an ambient temperature.

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Dual-component cholesterol-based gelators bearing complementary hydrogen-bonding sites

Cited by 67 publications

References 23 publications

Gelation of Room-Temperature Liquid Crystals by the Association of atrans-1,2-Bis(amino)cyclohexane Derivative

Gelation of Room-Temperature Liquid Crystals by the Association of atrans-1,2-Bis(amino)cyclohexane Derivative

Organic gels are useful as a template for the preparation of hollow fiber silica

Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction

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