Comparative study on physicochemical and mechanical characterization of newnanocarbon-based hydroxyapatite nanocomposites

Abstract

This study evaluated the effect of different additives such as nanocarbon compounds (0.5, 1.0, and 2.0 wt.%) with different morphologies and gelatin (Gel) (10 wt.%) on the mechanical properties of hydroxyapatite (Hap)based nanocomposites (NCs). The NCs were prepared using the innovation process "SmartBox" based on the Internet of things (IoT), which provides process control and reproducibility, and they were characterized by X-ray diffraction, particle size distribution, transmission electron microscopy, Fourier transform infrared spectroscopy, and thermal analysis. The compressive strength tests demonstrated that the use of grapheme oxide (Hap_GO_2.0-133 N/mm 2) , and/or Gel (Hap_Gel-152 N/mm 2) as additives to reinforce Hap (106 N/mm 2) is more appropriate than the use of single functionalized multiwalled carbon nanotubes (Hap_fMWCNT_1.0-110 N/mm 2) and fullerene (Hap_Ful_0.5-106 N/mm 2) .

Hydroxyapatite and Silicon-Modified Hydroxyapatite as Drug Carriers for 4-Aminopyridine

“…The particles were concisely arranged and were elongated and rounded in shape. This property is characteristic of HAP-based materials prepared by the precipitation method [51]. No increase in particle size was observed after 4AP adsorption, and the main diameter values were similar for HAP and HAP_4AP_25 and Si-HAP_4AP_25, respectively.…”

“…The results of thermogravimetry (TG) and differential thermal analysis (DTA) of carriers (HAP, Si-HAP), drug-loaded carriers (HAP_4AP_25 and Si-HAP_4AP_25), and drugs (4AP) are illustrated in Figure 2, and the most representative data are shown in Table 1. The decomposition mechanisms of 4AP and HAP have been interpreted based on the literature data [50][51][52]. In the case of 4AP, no modification in mass was observed up to 120 °C, and the melting processes started between 120-180 °C [50].…”

Magnetic interactions in graphene decorated with iron oxide nanoparticles

“…Moreover, the introduction of inorganic components to Nanotechnology Nanotechnology 32 (2021) 305703 (13pp) https://doi.org/10.1088/1361-6528/abf3ef organic matrix ensures outstanding biocompatibility [9]. In particular carbon nanostructures combined with hydroxyapatite shows excellent compatibility to bone tissue and collagen fibrils [10][11][12]. Another route for functionalization of carbon nanostructures is related to improvements in the efficient decoration of the graphene surface with magnetic nanoparticles, one of the major subjects of interest in recent years due to the high specific surface area of graphene [13].…”

Quantitative characterization of dielectric properties of polymer fibers and polymer composites using electrostatic force microscopy

“…Composites comprising insulating polymers with conductive fillers form very promising materials that can be used in many distinct fields in the modern world [1][2][3][4]. A special category is the polymer-based nanocomposite which can be formed by embedding nanoscale conducting materials, such as graphene or carbon nanotubes, into the polymer matrix [3,[5][6][7][8][9][10][11]. Carbon nanotubes (CNT) play a very special role as nano-inclusions, due to their fascinating thermal, electrical, optical and mechanical properties [12][13][14][15].…”

“…Polymer-CNT nanocomposites are used in a wide range of applications such as pressure sensors [14,16], electromagnetic interference shielding [17], chemical sensors [18][19][20], and coatings by electrodeposition [21]. Addition of CNTs into the polymer matrix improves the composite mechanical and electrical properties [5,7,14,20,22,23]. Electrical conductivity of the polymer increases dramatically at a critical filler concentration, called the percolation threshold [14,20,24,25].…”