Study on Oil Absorption Properties of Magnetic Chitosan Stearic Acid Compound

Abstract The magnetic chitosan-stearic acid compound was prepared for using chitosan and stearic acid. The morphology, structure and hydrophobic property of the magnetic chitosan-stearic acid compound were characterized. The influences of oil type and temperature on its oil absorption performance were determined. The results shows that the magnetic chitosan-stearic acid compound has a fluffy structure with a contact angle of 133.65°, indicating that the compound has a good hydrophobic property. Different oils have various impact on the oil absorption performance of the magnetic chitosan-stearic acid compound. The magnetic chitosan-stearic acid compound has the best oil absorption to crude oil, with an oil absorption rate of 4.12 g/g. With the increase of temperature, the oil absorption rate first increases and then decreases. There is an optimal temperature for oil absorption, with a temperature of 40°C.

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Effects of Electroless Nickel on Hydrogen Absorption Properties of Zr-V-Fe Powders

Materials Science Forum ◽

10.4028/www.scientific.net/msf.815.268 ◽

2015 ◽

Vol 815 ◽

pp. 268-275

Author(s):

Hang Cui ◽

Jian Dong Cui ◽

Yao Hua Xu ◽

Hao Zhou ◽

Jun Du

Keyword(s):

Crystalline Phase ◽

Hydrogen Absorption ◽

Absorption Rate ◽

Dynamic Method ◽

Hydrogen Diffusion ◽

Electroless Nickel ◽

Absorption Kinetics ◽

Absorption Properties ◽

Absorption Performance ◽

Kinetics Of

Nickel coated Zr-V-Fe non-evaporable getter (NEG) powders were prepared using electroless plating. The microstructure and composition of the Ni-coated Zr-V-Fe powders were analyzed by XRD, SEM and EDS. The hydrogen absorption performance of Ni-coated Zr-V-Fe powders and as-prepared powders were analyzed by dynamic method after an activation at 300°C for 2 hours. The hydrogen absorption performance of Ni-coated Zr-V-Fe powders and as-prepared powders at 100°C, 200°C, 300°C, 400°C, and 500°C were also analyzed. The results indicated that Ni existed as crystalline phase. The Ni coating played an important role as a catalyst which favored the dissociation of hydrogen on surface and Ni lowers the hydrogen diffusion energy for the Zr-V-Fe powders. The hydrogen absorption kinetics of Ni-coated Zr-V-Fe powders was improved in comparison with that of the as-prepared powders, and a relatively higher absorption rate was exhibited.

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Mechanical and the effect of oil absorption on tribological properties of carbon-based brake pad material

Tribologia - Finnish Journal of Tribology ◽

10.30678/fjt.98392 ◽

2021 ◽

Vol 38 (1−2) ◽

Author(s):

Oluwatoyin Joseph Gbadeyan ◽

T. P. Mohan ◽

K. Kanny

Keyword(s):

Tribological Properties ◽

Absorption Rate ◽

Friction Material ◽

Material System ◽

Oil Absorption ◽

Brake Pad ◽

Wear Properties ◽

Absorption Properties ◽

Brake Pads ◽

Carbon Based

This research focuses on the mechanical and effect of oil absorption on the tribological properties of carbon-based brake pad material (CBP). Carbon-based materials, including those at a nanosize, are combined for developed brake pad material. The mechanical properties related to wear properties such as compression strength, stiffness, hardness, and absorption properties were determined. The effect of oil absorption on the tribological properties of carbon-based materials was investigated. The obtained properties are compared with that of a ceramic-made brake pad (commercial). The experimental results show that the mechanical and absorption properties of the developed brake pad material varied with the combination and quantity of additives used to develop each brake pad material. CBP material offered higher performance than ceramic-made brake pads. The CBP material showed a higher shear strength of about 110%, 51% enhanced compressive strength, 35% greater modulus, comparative statistical hardness, 98% lesser water intake, and 97% oil absorption rate than ceramic made brake pad. The tribological properties of friction material after soaked in oil proved that absorption properties affect tribological properties of brake pads, which can be attributed to the oil content in the material system. The effect of oil uptakes on wear rate and friction of the commercial brake pad was higher than CBP materials, implying that the loading of carbon-based materials is a viable way to reduce absorption rate, which helps in increasing brake pad performance. The improved properties are suggestive of materials combinations that may be used to develop brake pad materials.

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

Materials ◽

10.3390/ma12182921 ◽

2019 ◽

Vol 12 (18) ◽

pp. 2921 ◽

Cited By ~ 1

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.

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Preparation and oil absorption performance of polyacrylonitrile / reduced graphene oxide composite porous material

Journal of Water Process Engineering ◽

10.1016/j.jwpe.2021.102092 ◽

2021 ◽

Vol 41 ◽

pp. 102092

Author(s):

Shuhua Wang ◽

Zeling Wen ◽

Sheng Shi ◽

Wensheng Hou

Keyword(s):

Graphene Oxide ◽

Porous Material ◽

Reduced Graphene Oxide ◽

Oil Absorption ◽

Oxide Composite ◽

Reduced Graphene ◽

Absorption Performance

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Fish bone-derived interconnected carbon nanofibers for efficient and lightweight microwave absorption

SN Applied Sciences ◽

10.1007/s42452-021-04204-4 ◽

2021 ◽

Vol 3 (2) ◽

Author(s):

Yangyang Gu ◽

Peng Dai ◽

Wen Zhang ◽

Zhanwen Su

Keyword(s):

Microwave Absorption ◽

Carbon Nanofibers ◽

Three Dimensional ◽

Fish Bone ◽

Absorption Properties ◽

Simple Method ◽

Microwave Absorption Properties ◽

Absorption Performance ◽

Microwave Absorption Performance ◽

Better Than

AbstractIn this work, we demonstrated a simple method for preparing three-dimensional interconnected carbon nanofibers (ICNF) derived from fish bone as an efficient and lightweight microwave absorber. The as-obtained ICNF exhibits excellent microwave absorption performance with a maximum reflection loss of –59.2 dB at the filler content of 15 wt%. In addition, the effective absorption bandwidth can reach 4.96 GHz at the thickness of 2 mm. The outstanding microwave absorption properties can be mainly ascribed to its well-defined interconnected nanofibers architecture and the doping of nitrogen atoms, which are also better than most of the reported carbon-based absorbents. This work paves an attractive way for the design and fabrication of highly efficient and lightweight electromagnetic wave absorbers.

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Hybrids of cobalt nanochains and polyvinylidene fluoride with enhanced microwave absorption performance

RSC Advances ◽

10.1039/c6ra10722b ◽

2016 ◽

Vol 6 (60) ◽

pp. 55546-55551 ◽

Cited By ~ 6

Author(s):

Shu-Qing Lv ◽

Ya-Fei Pan ◽

Pei-Bo Yang ◽

Guang-Sheng Wang

Keyword(s):

Microwave Absorption ◽

Polyvinylidene Fluoride ◽

Chemical Method ◽

Wet Chemical Method ◽

Absorption Properties ◽

Flexible Film ◽

Absorption Performance ◽

Wet Chemical ◽

Microwave Absorption Performance

By using a simple wet chemical method and hot-molding procedure, a kind of flexible film with enhance absorption properties based on binary cobalt nanochains/polyvinylidene fluoride (PVDF) hybrids has been successfully fabricated.

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