Porous carbon nanotubes/cobalt nanoparticles (CNTs/Co) composite with dodecahedron morphology was synthesized by in situ pyrolysis of the Co-based zeolitic imidazolate framework a reducing atmosphere. The and microstructure can be well tuned controlling conditions. At lower temperature, CNTs/Co is composed well-dispersed Co short CNT clusters low graphitic degree. increase temperature/time promotes growth graphitization CNTs leads to aggregation nanoparticles. optimized exhibits strong...

Developing lightweight and highly efficient electromagnetic wave (EMW) absorbing materials is crucial but challenging for anti-electromagnetic irradiation interference. Herein, we used multiwalled carbon nanotubes (MWCNTs) as templates growth of Co-based zeolitic imidazolate frameworks (ZIFs) obtained a Co–C/MWCNTs composite by postpyrolysis. The MWCNTs interconnected the ZIF-derived Co–C porous particles, constructing conductive network electron hopping migration. Moreover, was aligned in...

Abstract Anisotropic Fe 3 O 4 nanoparticle and a series of its graphene composites have been successfully prepared as high-frequency absorbers. The crystal structure, morphology magnetic property the samples were detailed characterized through X-ray diffractometer (XRD), transmission electron microscopy (TEM) vibrating sample magnetometer (VSM). absorbing performance is evaluated within 2.0–18.0 GHz. Combining reduced oxide (RGO) to helps adjust permittivity permeability composite, balance...

Magnetic oxides are widely used as electromagnetic (EM) wave absorbers. To promote the absorption efficiency, tremendous efforts have been contributed to adjusting composite, structure, and size of magnetic loss materials. Employing carbon materials (CNTs, CF, graphene, PANI) is an efficient way improve dielectric matrix. Anchoring tiny‐monodispersed Fe 3 O 4 nanoparticles (NPs) onto lightweight multi − walled nanotubes (MWCNTs) leads impedance matching characteristic. NPs along...

Flower-like BaTiO3/Fe3O4 hierarchically structured particles composed of nano-scale structures on micro-scale materials were synthesized by a simple solvothermal approach and characterized the means X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM), magnetic testing rotary viscometer. The influences morphology structure times, type amount surfactant, EG : H2O ratio, etc. studied. Magnetic results show that samples have strong magnetism they exhibit...

A simple, one-pot solvothermal method has been demonstrated for the preparation of bifunctional Fe3O4@titanium oxide core/shell nanoparticles. In a typical procedure, tetraalkoxyl titanium Ti(OC4H9)4 and FeCl3 as precursors were added into ethylene glycol further treatment was used to synthesize particles. The particles characterized by scanning electron microscopy (SEM), transmission (TEM), X-ray diffraction (XRD), SQUID MPMS rheometry. morphological results showed nanorods with 100–200 nm...

Simultaneous thermal analysis and Fourier transform infrared spectroscopy in situ diffuse reflection technology were used to quantitatively study the quality functional groups of lignite during oxidation process according temperature. The Kubelka-Munk equation Starink method calculate kinetics for first time. results show that heating varies stages, including a water evaporation desorption stage, an oxygen absorption weight gain stage decomposition stage. main coal include -OH, C = O,...

ABSTRACT A novel polyaniline nanofiber/kaolinite nanoplatelet hybrid nanocomposite was synthesized by means of rapidly mixed in situ polymerization. The resultant polyaniline/kaolinite characterized via different techniques, such as X‐ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission microscopy. results show that 2D clay nanoplatelets are coated the 1D nanofibers. nanoclay platelets can improve thermal...

Abstract A modified interfacial polymerization was used to prepare polyaniline (PANI) nanohybrids. The influence of the synthetic route, amounts bentonite, and surfactant on structure, morphology, optical properties as‐synthesized nanocomposite were investigated. These materials characterized by field emission scanning electron microscopy (SEM), transmission (TEM), X‐ray diffraction, ultraviolet–visible spectroscopy, thermogravimetric analysis, rheometer. results show that PANI could be...

This study investigates changes in the concentration and types of free radicals process coal heating, first rising then falling. Hailar lignite, Panjiang bituminous coal, Yangquan anthracite were selected as test samples. The results show that lignite's radical during heating is greater than or anthracite. It clearly shows lignite more prone to spontaneous combustion. In cooling portion experiment, was much at same temperature process. These obtained from this research can provide a...

Coal spontaneous combustion can cause serious coal mine fire and gas explosion. In order to overcome the problem that effect of existing materials inhibit is reduced at high temperature some environmental protection problems materials, this study developed an effective, green antioxidant foamed gel (AFG). Modified sodium polyacrylate, konjac glucomannan, dodecyl sulfate, alpha-olefin sulfonate, modified silicone polyether microemulsion, montmorillonite, tert-butyl hydroquinone were selected...

Considering disadvantages such as the low thermal stability and environmental pollution of existing gel inhibitors, a green stable intumescent nanoinhibitor (INI) was prepared tested. First, polyacrylamide (PAM), nano-silica, flame retardant (IFR) were selected raw materials. The INI by nanoparticle modification cross-linking polymerization. Then, structure physical properties tested Fourier transform infrared spectroscopy, scanning electron microscopy, rheological experiments. Meanwhile,...

In order to study the change laws of free radicals and functional groups during low-temperature coal oxidation, three samples with different metamorphic degrees were selected for ESR FTIR analysis. The results showed that concentration increased as temperature increased; meanwhile, types changed constantly, radical variation range decreased increase in metamorphism. side chains aliphatic hydrocarbons a low degree by varying amounts initial heating stage. -OH content bituminous lignite first...

In order to improve efficiency when preventing and controlling spontaneous combustion of coal, a type compound inhibitor with tea polyphenol vitamin E as the chemical inhibitor, grafted on copolymer hydrogel, was prepared. The oxidation resistance coal analyzed by thermogravimetric test, Fourier infrared spectroscopy, quantum chemistry theory. experiment results showed that: optimum ratio polyphenols 1:0.05; inhibited capturing decomposition products hydroperoxides finally forming stable...

Abstract α‐Fe 2 O 3 @TiO core–shell nanoparticles were prepared through a combination of reflux and hydrolysis methods. Firstly, spindle‐like monodispersed nanorod core was fabricated by using method. In the second step, an amorphous TiO shell coated onto surface nonspherical with uniform thickness means controlled The morphology, structure, electrorheological (ER) activity determined X‐ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM), magnetic testing,...

The anisotropic spindle-like Fe 3 O 4 hybrid nanocomposites blended with multi-wall carbon nanotubes (MWCNTs) have been prepared to function as an ideal lightweight candidate for electromagnetic (EM) wave absorption decent performance in high frequency. microstructure, morphology, magnetic properties, charge-transfer behavior and EM absorbing characterized by powder X-ray diffractometer, transmission electron microscope, vibrating sample magnetometer, Raman spectrometer vector network...