Brandão Ana T S C, Rosoiu Sabrina, Costa Renata, Silva A Fernando, Anicai Liana, Enachescu Marius, Pereira Carlos M
CIQUP-Physical Analytical Chemistry and Electrochemistry Group, Departamento de Química e Bioquimica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169007 Porto, Portugal.
Center for Surface Science and Nanotechnology, University Polytechnica of Bucharest, Splaiul Independentei, 313, 060042 Bucharest, Romania.
Nanomaterials (Basel). 2021 Dec 29;12(1):99. doi: 10.3390/nano12010099.
A suitable dispersion of carbon materials (e.g., carbon nanotubes (CNTs)) in an appropriate dispersant media, is a prerequisite for many technological applications (e.g., additive purposes, functionalization, mechanical reinforced materials for electrolytes and electrodes for energy storage applications, etc.). Deep eutectic solvents (DES) have been considered as a promising "green" alternative, providing a versatile replacement to volatile organic solvents due to their unique physical-chemical properties, being recognized as low-volatility fluids with great dispersant ability. The present work aims to contribute to appraise the effect of the presence of MWCNTs and Ag-functionalized MWCNTs on the physicochemical properties (viscosity, density, conductivity, surface tension and refractive index) of glyceline (choline chloride and glycerol, 1:2), a Type III DES. To benefit from possible synergetic effects, AgMWCNTs were prepared through pulse reverse electrodeposition of Ag nanoparticles into MWCNTs. Pristine MWCNTs were used as reference material and water as reference dispersant media for comparison purposes. The effect of temperature (20 to 60 °C) and concentration on the physicochemical properties of the carbon dispersions (0.2-1.0 mg cm) were assessed. In all assessed physicochemical properties, AgMWCNTs outperformed pristine MWCNTs dispersions. A paradoxical effect was found in the viscosity trend in glyceline media, in which a marked decrease in the viscosity was found for the MWCNTs and AgMWCNTs materials at lower temperatures. All physicochemical parameters were statistically analyzed using a two-way analysis of variance (ANOVA), at a 5% level of significance.
碳材料（如碳纳米管（CNTs））在合适的分散剂介质中的适当分散，是许多技术应用（如添加剂用途、功能化、用于电解质的机械增强材料以及储能应用的电极等）的先决条件。深共熔溶剂（DES）被认为是一种有前景的“绿色”替代品，由于其独特的物理化学性质，可作为挥发性有机溶剂的通用替代品，被认为是具有出色分散能力的低挥发性流体。本工作旨在评估多壁碳纳米管（MWCNTs）和银功能化多壁碳纳米管对甘油（氯化胆碱和甘油，1:2）这种III型DES的物理化学性质（粘度、密度、电导率、表面张力和折射率）的影响。为了利用可能的协同效应，通过将银纳米颗粒脉冲反向电沉积到MWCNTs中来制备银功能化多壁碳纳米管（AgMWCNTs）。使用原始MWCNTs作为参考材料，水作为参考分散剂介质进行比较。评估了温度（20至60°C）和浓度对碳分散体（0.2 - 1.0 mg/cm）物理化学性质的影响。在所有评估的物理化学性质方面，AgMWCNTs的表现优于原始MWCNTs分散体。在甘油介质的粘度趋势中发现了一种矛盾的效应，即MWCNTs和AgMWCNTs材料在较低温度下粘度显著降低。所有物理化学参数均使用双向方差分析（ANOVA）进行统计分析，显著性水平为5%。
