Electrical Conductivity and Compressive Strength of Cement Paste with Multiwalled Carbon Nanotubes and Graphene Nanoplatelets

Abstract

Many studies have been conducted using carbon-based nanomaterials (CBNs) for improving the electrical conductivity and mechanical properties of cementitious composites, but their practical use is yet to be achieved. Several methods have been attempted to secure the dispersibility in the cementitious composite matrix of CBNs, such as multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs). In this study, MWCNTs and GNPs were noncovalently functionalized using melamine, a low-cost chemical, and ball milling, a simple process commonly used in industrial fields. Additionally, MWCNTs and GNPs having one- and two-dimensional shapes were mixed with the cement paste to examine their effect on electrical conductivity and compressive strength. Following the experiment, it was shown that the electrical conductivity was improved via the noncovalent functionalization of MWCNT and GNP. The compressive strength increased up to approximately 0.30–0.60% of the CBNs content; however, for CBN content higher than 0.60%, the compressive strength decreased. The hybrid MWCNT and GNP mixture had a negligible effect on the electrical conductivity and compressive strength.

Dendrimers: Advancements and Potential Applications in Cancer Diagnosis and Treatment—An Overview

“…Polymeric nanoparticles -efficient for targeted drug distribution -possibility to modify shape, composition, size, and surface characteristics -stability -high therapeutic efficiency -large encapsulation capacity -toxic degradation -difficult encapsulation for hydrophilic drugs [33][34][35][36][37] Carbon nanotubes -cylindrical shape with a closed end, suitable for antimicrobial agents and gene delivery -electrical conductivity -resistance -high specific surface area -insoluble in aqueous and organic solvents [14,33,36,38] Liposomes -externally formed from a double hydrophobic phospholipid bilayer that can be modified to reduce side effects, while the interior is represented by an aqueous core in which drugs, proteins, genes, or peptides can be encapsulated -specific drug transport without degradation -high biocompatibility -high permeability of drug distribution -sensitivity to extrinsic and intrinsic stimuli [14,33,36,[39][40][41][42] Gold nanoparticles -exhibit unique optical properties and have the ability to conjugate with antibodies -water solubility -extremely stable -low toxicity -biological stability may decrease in vivo [33,36,[43][44][45] Figure 1. Advantages of nano systems in medicine [18,[29][30][31].…”

Electrical Properties of the Carbon Nanotube-Reinforced Geopolymer Studied by Impedance Spectroscopy

“…These works were developed by many research groups, e.g., [ 4 , 5 , 6 , 7 ], which were looking for more effective ways to use carbon-based conductive materials in Structural Health Monitoring (SHM). With the appearance of carbon nanomaterials, they have led to attempts to use mainly CNT [ 8 , 9 ] and graphene [ 10 , 11 ] to monitor and protect various types of building structures, not just concrete structures [ 12 ].…”