C2-symmetric cyclohexane-based hydrogels: A rational designed LMWG and its application in dye scavenging

Tang, Yitian; Dou, Xiaoqiu; Ji, Zhi-Ang; Li, Ping; Zhu, Shenmin; Gu, Jiajun; Feng, Chuanliang; Zhang, Di

doi:10.1016/j.molliq.2012.09.008

Cited by 15 publications

(9 citation statements)

References 19 publications

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“…Among all kinds of methods, absorption is more preferred due to its low cost, high efficiency, and easy handling. Supramolecular hydrogels which contain both hydrophilic and hydrophobic groups can absorb a variety of dyes − and may have superiority in the recycle and adsorption rate compared with some traditional methods. As shown in Scheme , Banerjee and co-workers report a phenylalanine-based bolaamphiphile, 493 , containing a centrally located oligomethylene group, which affords a hydrogel at pH 6.5–7.2 in the presence of divalent metal salts (e.g., MnCl 2 , CoCl 2 , CuSO 4 , and NiCl 2 ).…”

Section: Applicationsmentioning

confidence: 99%

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

et al. 2015

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In this review we intend to provide a relatively comprehensive summary of the work of supramolecular hydrogelators after 2004 and to put emphasis particularly on the applications of supramolecular hydrogels/hydrogelators as molecular biomaterials. After a brief introduction of methods for generating supramolecular hydrogels, we discuss supramolecular hydrogelators on the basis of their categories, such as small organic molecules, coordination complexes, peptides, nucleobases, and saccharides. Following molecular design, we focus on various potential applications of supramolecular hydrogels as molecular biomaterials, classified by their applications in cell cultures, tissue engineering, cell behavior, imaging, and unique applications of hydrogelators. Particularly, we discuss the applications of supramolecular hydrogelators after they form supramolecular assemblies but prior to reaching the critical gelation concentration because this subject is less explored but may hold equally great promise for helping address fundamental questions about the mechanisms or the consequences of the self-assembly of molecules, including low molecular weight ones. Finally, we provide a perspective on supramolecular hydrogelators. We hope that this review will serve as an updated introduction and reference for researchers who are interested in exploring supramolecular hydrogelators as molecular biomaterials for addressing the societal needs at various frontiers.

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Section: Applicationsmentioning

confidence: 99%

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

et al. 2015

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“…The elemental analyses were performed with a Perkin Elmer Elemental Analyzer (Series-II, CHNS/O Analyzer-2400). 13 C and 29 Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra were recorded in the solid state using a 500 MHz Bruker Advance II-500NMR spectrometer. FTIR spectra were recorded in solid state (KBr pellet method) using a Model Spectrum 2000 FTIR spectrometer (Perkin Elmer).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Removal of Methylene Blue and Methyl Violet Dyes from Aqueous Solution Using a Nanocomposite of Hydrolyzed Polyacrylamide Grafted Xanthan Gum and Incorporated Nanosilica

Ghorai

Sarkar

Raoufi

et al. 2014

ACS Appl. Mater. Interfaces

468

238

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The synthesis and characterization of a novel nanocomposite is reported that was developed as an efficient adsorbent for the removal of toxic methylene blue (MB) and methyl violet (MV) from aqueous solution. The nanocomposite comprises hydrolyzed polyacrylamide grafted onto xanthan gum as well as incorporated nanosilica. The synthesis exploits the saponification of the grafted polyacrylamide and the in situ formation of nanoscale SiO2 by a sol-gel reaction, in which the biopolymer matrix promotes the silica polymerization and therefore acts as a novel template for nanosilica formation. The detailed investigation of the kinetics and the adsorption isotherms of MB and MV from aqueous solution showed that the dyes adsorb rapidly, in accordance with a pseudo-second-order kinetics and a Langmuir adsorption isotherm. The entropy driven process was furthermore found to strongly depend on the point of zero charge (pzc) of the adsorbent. The remarkably high adsorption capacity of dyes on the nanocomposites (efficiency of MB removal, 99.4%; maximum specific removal Qmax, 497.5 mg g(-1); and efficiency of MV removal, 99.1%; Qmax, 378.8 mg g(-1)) is rationalized on the basis of H-bonding interactions as well as dipole-dipole and electrostatic interactions between anionic adsorbent and cationic dye molecules. Because of the excellent regeneration capacity the nanocomposites are considered interesting materials for the uptake of, for instance, toxic dyes from wastewater.

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“…ATR–FTIR spectroscopy has been used to extract information about the extent of hydrogen bonding in supramolecular gels, ,,− and the difference between N–H stretching peaks in the solid state and gel state will enable elucidation of structural information for the self-assembled hierarchical TAV aggregates. The IR spectra recorded in the gel states indicated a slight broadening of the amide band, and the N–H stretching peaks were shifted toward lower wavenumber for RS -TAV and ( RR + SS )- TAV .…”

Section: Resultsmentioning

confidence: 99%

Unraveling the Self-Assembly Modes in Multicomponent Supramolecular Gels Using Single-Crystal X-ray Diffraction

et al. 2020

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The control and prediction of the self-assembly process in multicomponent supramolecular gels are challenging because the structure and properties rely mostly on the geometry and spatial arrangement of the building blocks. The understanding of noncovalent interactions between the individual gelators at the molecular level will enable us to tune the gelation properties of multicomponent gels. We have studied the self-assembly process of multicomponent gel based on enantiomers and herin we report the first crystallographic evidence of specific co-assembly in mixed enantiomeric gel, which is supported by scanning electron microscopy and atomic force microscopy images. The mode of interactions between the individual gelators from the molecular to macroscopic level, which are responsible for co-assembled fibers, was identified by single-crystal X-ray diffraction. We have proved that specific co-assembly leads to enhanced mechanical and thermal stability in the mixed gel compared to the meso and individual enantiomeric gels.

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C2-symmetric cyclohexane-based hydrogels: A rational designed LMWG and its application in dye scavenging

Cited by 15 publications

References 19 publications

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials

Enhanced Removal of Methylene Blue and Methyl Violet Dyes from Aqueous Solution Using a Nanocomposite of Hydrolyzed Polyacrylamide Grafted Xanthan Gum and Incorporated Nanosilica

Unraveling the Self-Assembly Modes in Multicomponent Supramolecular Gels Using Single-Crystal X-ray Diffraction

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