Biocompatible ionic liquids as stabilizers and dispersing solvents of multi-walled carbon nanotubes: A comparable study of stable composites between imidazolium and cholinium

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-05-07 DOI:10.1016/j.molliq.2025.127742

Pannuru Kiran Kumar , Indrani Jha , Ritu Yadav , Anjeeta Rani , Indra Bahadur , Pannuru Venkatesu , Sangeeta Singh , Kaniki Tumba

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Abstract

This research explores the dispersion and stabilization of functionalized multi-walled carbon nanotubes (fCNTs) using ionic liquids (ILs) with varying concentrations of both fCNTs and ILs. In this work imidazolium-based ILs (1-butyl-3-methylimidazolium chloride [Bmim][Cl] and 1-butyl-3-methylimidazolium acetate [Bmim][Ac]) and cholinium-based ILs (choline chloride [Ch][Cl] and choline acetate [Ch][Ac]) were utilized to understand the impact of different ILs molecular structures on MWCNT dispersion. Techniques such as UV–visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and transmission electron microscopy (TEM) were employed to analyze the ILs-MWCNT composites. The results indicate that MWCNT concentration significantly affects their interaction with ILs at 0.025 mg/mL of fCNTs being optimal for imidazolium-based ILs. Higher IL concentrations (0.5 and 1.0 mg/mL) were found to be less effective. Imidazolium-based ILs were more effective than cholinium-based ILs in dispersing of fCNTs, due to cation–π or CH–π interactions between imidazolium cations and the π-electron network of fCNTs. The formation of nano-IL-based composites was confirmed by a new absorption band around 225 nm in the UV–visible spectra. The stability in the absorbance peak suggests that the interaction between the ILs and fCNTs forms a stable complex that does not undergo significant changes or degradation for long-time, which makes them suitable for long-term use in various technological and industrial applications. This finding highlights the robustness of the IL-MWCNT interaction and underscores the potential of these materials for applications requiring stable and durable nanomaterial dispersions. This study sheds light on the mechanisms governing carbon nanotube (CNT) dispersion in aqueous solutions and emphasizes the importance of IL cationic components in optimizing MWCNT dispersion and stabilization.

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生物相容性离子液体作为多壁碳纳米管的稳定剂和分散溶剂：咪唑和胆碱稳定复合材料的比较研究

本研究探讨了功能化多壁碳纳米管（fCNTs）在不同浓度的离子液体（ILs）中的分散和稳定性。本研究利用咪唑基il（1-丁基-3-甲基咪唑氯[Bmim][Cl]和1-丁基-3-甲基咪唑乙酸[Bmim][Ac]）和胆碱基il（氯化胆碱[Ch][Cl]和醋酸胆碱[Ch][Ac]）来研究不同il分子结构对MWCNT分散的影响。采用紫外-可见光谱、傅里叶变换红外光谱（FTIR）、动态光散射（DLS）和透射电子显微镜（TEM）等技术对il - mwcnt复合材料进行了分析。结果表明，MWCNT浓度显著影响其与il的相互作用，0.025 mg/mL的fcnt对咪唑基il最优。较高的IL浓度（0.5和1.0 mg/mL）效果较差。由于咪唑类离子与fCNTs的π电子网络之间存在阳离子-π或CH -π相互作用，咪唑类离子在分散fCNTs方面比胆碱类离子更有效。在紫外可见光谱中发现了225 nm左右的新吸收带，证实了纳米il基复合材料的形成。吸光度峰的稳定性表明，ILs和fCNTs之间的相互作用形成稳定的络合物，在很长时间内不会发生明显的变化或降解，这使得它们适合长期用于各种技术和工业应用。这一发现突出了IL-MWCNT相互作用的稳健性，并强调了这些材料在需要稳定和耐用的纳米材料分散体的应用中的潜力。本研究揭示了碳纳米管（CNT）在水溶液中的分散机制，并强调了IL阳离子组分在优化MWCNT分散和稳定中的重要性。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.