scholarly journals Facile fabrication of ultra-light and highly resilient PU/RGO foams for microwave absorption

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41321-41329 ◽  
Author(s):  
Chunmei Zhang ◽  
Hua Li ◽  
Zhangzhi Zhuo ◽  
Roberto Dugnani ◽  
Chongyang Sun ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Dip Coating ◽  
Composite Foams ◽  
Coating Method ◽  
Facile Fabrication ◽  
Absorption Performance ◽  
Microwave Absorbing ◽  
Dip Coating Method ◽  
Microwave Absorption Performance

Ultra-light and highly resilient PU/RGO foams are fabricated by a simple dip-coating method. The composite foams exhibit excellent microwave absorption performance and can be used as good microwave absorbing commercial cladding materials.

A simple hydrothermal process to grow MoS2 nanosheets with excellent dielectric loss and microwave absorption performance

2016 ◽  
Vol 4 (28) ◽  
pp. 6816-6821 ◽  
Author(s):  
Xiaohui Liang ◽  
Xingmiao Zhang ◽  
Wei Liu ◽  
Dongming Tang ◽  
Baoshan Zhang ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Hydrothermal Method ◽  
Microwave Absorption ◽  
Hydrothermal Process ◽  
Two Dimensional ◽  
Mos2 Nanosheets ◽  
Absorption Performance ◽  
Microwave Absorbing ◽  
Microwave Absorption Performance ◽  
Simple Hydrothermal Process

In this study, two-dimensional MoS2 nanosheets synthesized by a hydrothermal method were firstly investigated for microwave absorbing performance.

Air@rGO€Fe3O4 microspheres with spongy shells: self-assembly and microwave absorption performance

2016 ◽  
Vol 4 (44) ◽  
pp. 10518-10528 ◽  
Author(s):  
Qiang Zeng ◽  
Xu-hai Xiong ◽  
Ping Chen ◽  
Qi Yu ◽  
Qi Wang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Microwave Absorption ◽  
Self Assembly ◽  
Calcination Process ◽  
Emulsion Technique ◽  
Microwave Absorbing Properties ◽  
Absorption Performance ◽  
Microwave Absorbing ◽  
Fe3o4 Microspheres ◽  
Microwave Absorption Performance

Novel Air@rGO€Fe3O4 microspheres with excellent microwave absorbing properties and corrosion resistance were synthesized by a W/O emulsion technique followed by a calcination process.

A novel sponge-like 2D Ni/derivative heterostructure to strengthen microwave absorption performance

2018 ◽  
Vol 20 (45) ◽  
pp. 28623-28633 ◽  
Author(s):  
Biao Zhao ◽  
Xi Zhang ◽  
Jiushuai Deng ◽  
Zhongyi Bai ◽  
Luyang Liang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Microwave Absorption ◽  
Complex Permeability ◽  
Two Dimensional ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Absorption Performance ◽  
Microwave Absorbing ◽  
Microwave Absorption Performance

One of the major hurdles of Ni-based microwave absorbing materials is the preparation of two-dimensional (2D) Ni flakes that can improve magnetic anisotropy to tune complex permeability.

scholarly journals Conductive, Superhydrophobic, and Microwave-Absorbing Cotton Fabric by Dip-Coating of Aqueous Silk Nanofibers Stabilized MWCNTs and Octadecanoyl Chain Bonding

2021 ◽  
Author(s):  
Ling Liu ◽  
Mingyuan Wu ◽  
Qingyun Wu ◽  
Jiuyi Liu ◽  
Jianjun Yang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Microwave Absorption ◽  
Cotton Fabric ◽  
Active Sites ◽  
Dip Coating ◽  
Transmission Electron Microscopy Micrographs ◽  
Coating Adhesion ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Abstract A facile dip-coating method to endow cotton fabric (CF) with satisfactory conductivity, superhydrophobicity and microwave absorption performance was proposed based on the combination of multi-walled carbon nanotubes (MWCNTs) incorporation and hydrophobic octadecanoyl chain bonding. The entanglement and bundling of MWCNTs induced by the particularly high aspect ratio and high interaction energy renders homogeneous dispersion of MWCNTs a challenging. The durable coating adhesion of MWCNTs on hydrophilic CF remains the other challenge due to the absence of strong interactions with intrinsic hydrophobic MWCNTs. In this work, silk nanofibers (SNFs) were synthesized by degrading silk at high temperature, which was adopted as dispersant to prepare individually dispersed MWCNTs via ultrasonication and homogenization processes. The coating adhesion of MWCNTs to CF (MWCNTs-CF) was enhanced via dipping coating and thermal treatment induced chemical immobilization cycles. Octadecanoyl chain-tethered MWCNTs-CF (C18-MWCNTs-CF) was manufactured by further treatment with stearoyl chloride to achieve superhydrophobicity. The scanning and transmission electron microscopy micrographs demonstrated that the aggregates of MWCNTs were successfully de-bundled into individually dispersed nanotubes by taking advantages of the high π-π interaction and electrostatic repulsive interactions between MWCNTs and SNFs. SNFs has the superiority of chemical bonding with CF at high temperature and providing active sites for subsequent hydrophobic treatment. The electrical conductivity, surface properties, thermal stability, mechanical properties, and microwave absorption performance of the CF samples were evaluated systematically. Compared with pristine CF (1.04🞩1010 Ω), the C18-MWCNTs-CF exhibited excellent conductive property with surface resistance reaching 55 Ω when the loaded MWCNTs on CF were 247.5 mg/g in the case of 3 dipping-drying cycles and possessed a relatively greater microwave absorption performance of -36.08 dB at 9.28 GHz with merely 2.7 mm thickness. Compared with pristine CF, C18-MWCNTs-CF exhibited superhydrophobicity with the WCA increasing from 26° to 150° even after 20 scratching cycles due to the combination of facile octadecanoyl group tethering and the increased surface roughness. The biodegradable and recyclable C18-MWCNTs-CF exhibited reasonable electrical conductivity, superhydrophobicity and microwave absorption that promises an ideal application prospect in the field of smart textile and wearable electronic devices.

Porous Gel Coatings Obtained by Phase Separation in ORMOSIL System

2000 ◽  
Vol 628 ◽  
Author(s):  
Kazuki Nakanishi ◽  
Souichi Kumon ◽  
Kazuyuki Hirao ◽  
Hiroshi Jinnai
Keyword(s):  
Phase Separation ◽  
Reaction Time ◽  
Volume Fraction ◽  
Sol Gel ◽  
Reaction Times ◽  
Dip Coating ◽  
Coating Solution ◽  
Coating Method ◽  
Gel Phase ◽  
Dip Coating Method

ABSTRACTMacroporous silicate thick films were prepared by a sol-gel dip-coating method accompanied by the phase separation using methyl-trimethoxysilane (MTMS), nitric acid and dimethylformamide (DMF) as starting components. The morphology of the film varied to a large extent depending on the time elapsed after the hydrolysis until the dipping of the coating solution. On a glass substrate, the films prepared by early dipping had inhomogeneous submicrometer-sized pores on the surface of the film. At increased reaction times, relatively narrow sized isolated macropores were observed and their size gradually decreased with the increase of reaction time. On a polyester substrate, in contrast, micrometer-sized isolated spherical gel domains were homogeneously deposited by earlier dippings. With an increase of reaction time, the volume fraction of the gel phase increased, then the morphology of the coating transformed into co-continuous gel domains and macropores, and finally inverted into the continuous gel domains with isolated macropores. The overall morphological variation with the reaction time was explained in terms of the phase separation and the structure freezing by the forced gelation, both of which were induced by the evaporation of methanol during the dipping operation.

scholarly journals Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2921 ◽  
Author(s):  
Wei Huang ◽  
Yujiang Wang ◽  
Shicheng Wei ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Microwave Absorption ◽  
Ostwald Ripening ◽  
Impedance Matching ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Magnetic Structures ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

scholarly journals Preparation of Polypropylene/PVDF Composite Membrane by Dip-Coating Method

2021 ◽  
Vol 1115 (1) ◽  
pp. 012028
Author(s):  
P T P Aryanti ◽  
G Trilaksono ◽  
A Hotmaida ◽  
M A Afifah ◽  
F P Pratiwi ◽  
...  
Keyword(s):  
Composite Membrane ◽  
Dip Coating ◽  
Coating Method ◽  
Dip Coating Method

Characterization of UHMWPE- HAp coating produced by dip coating method on Ti6Al4V alloy

2021 ◽  
pp. 127091
Author(s):  
Gözde Çelebi Efe ◽  
Elif Yenilmez ◽  
İbrahim Altinsoy ◽  
Serbülent Türk ◽  
Cuma Bindal
Keyword(s):  
Dip Coating ◽  
Ti6al4v Alloy ◽  
Coating Method ◽  
Dip Coating Method
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