One‐step in situ growth of magnesium ferrite nanorods on graphene and their microwave‐absorbing properties

2017 ◽  
Vol 32 (2) ◽  
Author(s):  
Wei Chen ◽  
Qingyun Liu ◽  
Xixi Zhu ◽  
Min Fu
Keyword(s):  
In Situ Growth ◽  
Magnesium Ferrite ◽  
Microwave Absorbing Properties ◽  
One Step ◽  
Microwave Absorbing

One-step in situ growth of high-density POMOFs films on carbon cloth for the electrochemical detection of bromate

2020 ◽  
Vol 861 ◽  
pp. 113939 ◽  
Author(s):  
Yanan Zhang ◽  
Yu Zhang ◽  
Lei Li ◽  
Junlei Chen ◽  
Peizhi Li ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
High Density ◽  
Carbon Cloth ◽  
In Situ Growth ◽  
One Step

One-Step In Situ Growth of Iron-Nickel Sulfide Nanosheets on FeNi Alloy Foils: High-Performance and Self-Supported Electrodes for Water Oxidation

Small ◽  
2017 ◽  
Vol 13 (18) ◽  
pp. 1604161 ◽  
Author(s):  
Cheng-Zong Yuan ◽  
Zhong-Ti Sun ◽  
Yi-Fan Jiang ◽  
Zheng-Kun Yang ◽  
Nan Jiang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Performance ◽  
Nickel Sulfide ◽  
In Situ Growth ◽  
Iron Nickel ◽  
One Step ◽  
Feni Alloy

scholarly journals In situ regulation of microstructure and microwave-absorbing properties of FeSiAl through HNO3 oxidation

2021 ◽  
Vol 11 (1) ◽  
pp. 147-157
Author(s):  
Yang Guo ◽  
Liwen Zhang ◽  
Haipeng Lu ◽  
Xian Jian
Keyword(s):  
Oxide Layer ◽  
High Performance ◽  
Competitive Growth ◽  
Microwave Absorbing Properties ◽  
Negative Change ◽  
The Matrix ◽  
Strong Adhesion ◽  
Microwave Absorbing ◽  
Minimum Reflection Loss

Abstract Wrapping insulation of coatings is effective for enhancing the microwave-absorbing properties (MAPs) of ferromagnetic absorbents (FMAs). However, the process is still limited by the low bonding strength with the matrix. Herein, an in situ regulation strategy based on the preparation of thin thickness and strong adhesion insulating layers through HNO3 oxidation was developed to address the limitations. The oxidation process of FeSiAl (FSA) powders was carried out by HNO3 following three main steps. First, the original oxide layer first reacted with HNO3 to form Fe3+ and Al3+. Second, the oxide layer composed of Al2O3 and Fe3O4 was preferentially formed due to the negative change in Gibbs free energy. Finally, the oxide and pigment-deposition layers were subjected to competitive growth and dissolution accompanied by the dissolution of Fe and Al atoms. Oxidation time up to 10 min resulted in the formation of a bilayer structure with a thickness of ∼50 nm on the FSA surface, as well as an outer layer crammed of Al(OH)3 and Fe(OH)3, and an inner layer containing mixed Fe2O3, Fe3O4, Al2O3, and SiO2. The MAPs of as-treated FSA achieved minimum reflection loss (RL) of −25.90 dB at 13.36 GHz, as well as absorption bandwidth of 5.61 GHz (RL < −10 dB) at 10.13–15.74 GHz and thickness of 2.5 mm. In sum, the developed route looks promising for the preparation of high-performance FMAs.

IN SITU POLYMERIZATION OF FE3O4/POLYURETHANE NANOCOMPOSITES WITH HIGH PERFORMANCE

2016 ◽  
Vol 89 (4) ◽  
pp. 573-587 ◽  
Author(s):  
Junru Yao ◽  
Chunling Hou ◽  
Hailin Yu ◽  
Youyi Sun ◽  
Li Gao ◽  
...  
Keyword(s):  
High Performance ◽  
In Situ Polymerization ◽  
Magnetorheological Fluids ◽  
Synthesis Process ◽  
Polyurethane Elastomers ◽  
Microwave Absorbing Properties ◽  
Wide Range ◽  
Microwave Absorbing ◽  
Polyurethane Nanocomposites

ABSTRACT The stable Fe3O4 magnetorheological fluids were first prepared by coprecipitation method without using any surfactants and characterized by X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The polyurethane elastomers were further polymerized in the presence of stable Fe3O4 magnetorheological fluids. Furthermore, the effect of Fe3O4 loading on mechanical, magnetic, thermal, electrical, and microwave-absorbing properties of the polyurethane elastomers were systematically investigated. The results indicated that the synthesis process and Fe3O4 loading had great effects on the properties of polyurethane elastomers. A synthesis-based in situ polymerization method using Fe3O4 magnetorheological fluids instead of dry powder could improve the dispersion of Fe3O4 nanoparticles in the polyurethane matrix. The Fe3O4/polyurethane nanocomposites showed high mechanical, magnetic, thermal, electrical, and microwave-absorbing properties at a low loading of 2 wt%, and could potentially be used for a wide range of applications.

Flame-retardant and smoke-suppressing wood obtained by the in situ growth of a hydrotalcite-like compound on the inner surfaces of vessels

2019 ◽  
Vol 43 (41) ◽  
pp. 16359-16366 ◽  
Author(s):  
Shuai Lv ◽  
Xianggui Kong ◽  
Liren Wang ◽  
Fazhi Zhang ◽  
Xiaodong Lei
Keyword(s):  
Flame Retardant ◽  
Hydrothermal Process ◽  
Smoke Suppression ◽  
In Situ Growth ◽  
One Step

MgAl-CO32−-LDH was directly grown on the inner surfaces of wood vessels via a one-step hydrothermal process, which greatly enhanced the flame retardant and smoke suppression properties of the wood.

Fabrication of Carbon Nanofiber and Silicon Carbonitride Ceramic Nanomposites by In Situ Growth during Ceramic Formation

2014 ◽  
Vol 602-603 ◽  
pp. 221-225
Author(s):  
Meng Ying Liu ◽  
Ya Li Li ◽  
Sheng Xiang Qu ◽  
Shuai Shuai Han ◽  
Si Hui Wang
Keyword(s):  
Carbon Nanofiber ◽  
Ceramic Body ◽  
Sem Analysis ◽  
Silicon Carbonitride ◽  
Metal Particles ◽  
Metal Catalyst ◽  
Ceramic Surface ◽  
In Situ Growth ◽  
One Step

Carbon nanofiber (CNF) and silicon carbonitride (SiCN) ceramic nanocomposites (SiCN/CNF) are fabricated by in-situ growth of CNFs in SiCN ceramics during ceramic transformation of polymeric precursors of polysilazanes (PSZ). Metal catalyst precursors are mixed into the polysilazane liquid forming metal particles from decomposition under heating during the pyrolysis. At certain temperatures, ethylene was introduced as a carbon source to induce the growth of CNFs over the metal particles in the ceramic body followed by heating to higher temperatures to complete the pyrolysis. In this way, bulk nanocomposites of SiCN/CNF are obtained as crack-free bodies although some pores are left in the sample. Scanning electron microscopy (SEM) analysis performed on the cross-section of nanocomposites revealed the distribution of needle-like nanofibers of diameter ~ 200 nm and exposed length of ~ 2 μm. The CNFs exhibited the unique multiscale nanostructure in micron hollow tubes with branched nanofiber walls. Energy dispersive X-ray spectrometer (EDX) detected carbon as the major element from the nanofibers confirming the formation of carbon nanofibers. Moreover, clusters of nanoparticles are formed on the ceramic surface from carbon depositions. The in-situ growth of CNFs in SiCN ceramics provides a one-step process potentially to be developed for fabrication of structural and functional SiCN/CNF nanocomposites.

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