| Supramolecular gels possess the feature of structural diversity and multiple responsive, such unique features endow it a broad spectrum of applications prospect in biological medicine, template materials and drug carriers. However, a lack of mechanical strength restricts it's application greatly. Therefore, development the supramolecular gels which have good mechanical strength and more special responsive ha ve great significance.A series of supramolecular gels with good mechanical strength were prepared by mixed solvent or adding inorganic nanomaterials halloysite. By endow added inorganic nanomaterials magnetic responsiveness, magnetic supramolecular gels were prepared, and probed the application prospect for dye adsorption.1,3,2,4-(4-methyl benzyl fork) 2-D-sorbitol(MDBS) was used as gelator, quinoline and 2-chlorophenol were used as solvent, a series of gels were prepared by changing the proportion of quinoline and 2-chlorophenol. Through the compression stress-strain curve test found that as two kinds of solvent ratio changed the compressive strength of the gel changed as well. When the proportion of solvent suitable, maximum compressive strength of the gels significantly bigger than the gels with sole solvent. UV- vis characterization found that electron transfer occres between this two kinds of solvents, and preliminary inference that the interaction between the two kinds of solvents affects the gelator-solvent effect, then affects the process of gel self-assembly, eventually makes the gel's mechanical properties changed.Using the different nature of halloysite nanotubes inside and outside, hydrophobic surface modification of magnetic halloysite was prepared. By FT-IR, XRD and FE-SEM, found that magnetic particles were mainly distributed in the inner cavity of halloysite, only a small amount distributed in the outside surface. VSM characterization indicated that it was a typical paramagnetic materials and saturated magnetic was between 7~8 emu/g. The compressive stress-strain curves and rheological test of MDBS gels and magnetic MDBS gels showed that the strength of magnetic MDBS gel obvious increased compare to MDBS gel, the maximum compressive strength increased 44%. FI-IR analysis concluded that the cause of the enhancement is that hydrogen bonding formed between halloysite and MDBS, make the halloysite as a supporter to the network structure.Halloysite- metallogel was prepared by adding surface hydrophilic modified halloysite to melamine-iron metallogel. The test of sol- gel phase transition temperature shows that after joining halloysite the phase transition temperature increased, the gel with SDS/HN Ts and NaCH3COO/HNTs increased more obviously, from 48 ? to 64 ?. Rheological test also shows that after joining halloysite the energy storage modulus and loss modulus of the gels increased obviously. FE-SEM image see that SDS/HNTs evenly distributed in the gels system, and combined closely with gels fiber. FT-IR spectrum of dry metallogel proved that hydrogen bonds was formed between HN Ts and melamine, on the other side,UV-vis showed halloysite has certain adsorption to iron ions, which indicate that may be these two forces make the gel strength has certain increase.1,3,2,4-benzyl-D-sorbitol(DBS) as gelator, water and ethanol as solvent, DBS gels and magnetic DBS gels were prepared and have been used for adsorption of dye molecules.UV-vis test of dye solution before and after adsorption indicate that both DBS gels and magnetic DBS gels have certain adsorption effect for congo red, methyl orange and malachite green, but the magnetic DBS gels is better than DBS gels. Compression stress-strain test showed that higher strength of the magnetic DBS gel which declared by compression stress-strain test makes gel not easy to be destroyed in the adsorption and recovery process.In addition, it's magnetic responsiveness makes it easier for separation recycling. |
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