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Bio-based castor oil organogels and investigations on their anion-tuning properties
Colloid and Polymer Science ( IF 2.4 ) Pub Date : 2019-11-07 , DOI: 10.1007/s00396-019-04575-6
Hima Bindu , Aruna Palanisamy

We report here bio-based N-(2-hydroxyethyl) ricinoleic amide (NHRA) a derivative of castor oil, as a low molecular weight gelator showing good gelation in organic solvents. NHRA gelator molecules exhibited thermoreversible gelation in specific tested organic solvents such as aniline and 1,4 dioxane. The gelator molecules are self-assembled through intermolecular hydrogen bonding and van der Waals interactions which are the determining factors for the organogel formation as confirmed by FT-IR spectroscopy. Differential scanning calorimetry (DSC) measurements show the phase transition of gels from gel to solution state and strongly depend by varying the concentration of the gelator. The supramolecular aggregation of gelators in the gel state led to viscoelastic nature of the organogels and was studied by rheology. Morphological studies reveal the presence of lamellar fibrous-like structures, which are responsible for the molecules to aggregate into 3D network. The synthesized organogel acts as a host for anions that change the physical state from gel to sol by disruption of intermolecular hydrogen-bonding interactions. The propensity of the material to exhibit anion-responsive behavior is attributed to the presence of amide linkages, under which deprotonation of N–H fragments occur upon the addition of anions, as confirmed by 19F NMR and FT-IR spectroscopy. These results indicate that NHRA gelator can be prospective candidate for sensing applications Graphical abstract Graphical abstract

中文翻译:

生物基蓖麻油有机凝胶及其阴离子调节特性的研究

我们在这里报告了基于生物的 N-(2-羟乙基)蓖麻油酰胺(NHRA),一种蓖麻油衍生物,作为一种低分子量凝胶剂,在有机溶剂中表现出良好的凝胶化。NHRA 凝胶剂分子在特定测试的有机溶剂(如苯胺和 1,4 二恶烷)中表现出热可逆凝胶化。凝胶剂分子通过分子间氢键和范德华相互作用自组装,这是由 FT-IR 光谱证实的有机凝胶形成的决定因素。差示扫描量热法 (DSC) 测量显示凝胶从凝胶状态到溶液状态的相变,并且强烈依赖于凝胶剂浓度的变化。凝胶状态下凝胶剂的超分子聚集导致有机凝胶的粘弹性,并通过流变学进行研究。形态学研究揭示了层状纤维状结构的存在,这是分子聚集成 3D 网络的原因。合成的有机凝胶作为阴离子的宿主,通过破坏分子间氢键相互作用将物理状态从凝胶变为溶胶。材料表现出阴离子响应行为的倾向归因于酰胺键的存在,在酰胺键下,在加入阴离子时发生 N-H 片段的去质子化,如 19F NMR 和 FT-IR 光谱证实。这些结果表明 NHRA 凝胶剂可以成为传感应用的潜在候选者。合成的有机凝胶作为阴离子的宿主,通过破坏分子间氢键相互作用将物理状态从凝胶变为溶胶。材料表现出阴离子响应行为的倾向归因于酰胺键的存在,在酰胺键下,在加入阴离子时发生 N-H 片段的去质子化,如 19F NMR 和 FT-IR 光谱证实。这些结果表明 NHRA 凝胶剂可以成为传感应用的潜在候选者。合成的有机凝胶作为阴离子的宿主,通过破坏分子间氢键相互作用将物理状态从凝胶变为溶胶。材料表现出阴离子响应行为的倾向归因于酰胺键的存在,在酰胺键下,在加入阴离子时发生 N-H 片段的去质子化,如 19F NMR 和 FT-IR 光谱证实。这些结果表明 NHRA 凝胶剂可以成为传感应用的潜在候选者。经 19F NMR 和 FT-IR 光谱证实。这些结果表明 NHRA 凝胶剂可以成为传感应用的潜在候选者。经 19F NMR 和 FT-IR 光谱证实。这些结果表明 NHRA 凝胶剂可以成为传感应用的潜在候选者。
更新日期:2019-11-07
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