Controllable synthesis of uniform ZnO nanorods and their enhanced dielectric and absorption properties

2014 ◽  
Vol 2 (23) ◽  
pp. 8644-8651 ◽  
Author(s):  
Guang-Sheng Wang ◽  
Ying-Ying Wu ◽  
Xiao-Juan Zhang ◽  
Yong Li ◽  
Lin Guo ◽  
...  
Keyword(s):  
Percolation Threshold ◽  
Reflection Loss ◽  
Filler Content ◽  
Zno Nanorods ◽  
Dielectric Behavior ◽  
Hot Press ◽  
Controllable Synthesis ◽  
Absorption Properties ◽  
Press Method ◽  
Two Peaks

The PVDF/ZnO composites were prepared by a simple hot-press method. The dielectric behavior of the composites was improved at a lower percolation threshold. For the composites with a filler content of 10 wt%, the reflection loss appears as two peaks that can reach −15.90 dB at 6.60 GHz and −25.44 dB at 16.48 GHz.

scholarly journals Effect of impregnation on hybrid mesoporous silica / kenaf reinforced epoxy composites in term of flexural, compressive and water absorption properties

2020 ◽  
Vol 14 (4) ◽  
pp. 7528-7539
Author(s):  
F. Bajuri ◽  
N. Mazlan ◽  
M. R. Ishak ◽  
M. K. A. Uyup
Keyword(s):  
Mesoporous Silica ◽  
Water Absorption ◽  
Water Uptake ◽  
Silica Content ◽  
Epoxy Composites ◽  
Impregnation Method ◽  
Hot Press ◽  
Compressive Properties ◽  
Absorption Properties ◽  
Press Method

In this work, mesoporous silica with designated amount was added in kenaf/epoxy composites to improve the mechanical properties of the composite and reduce the water uptake of fabricated composites. The composites were fabricated using hot press method (HP) and impregnation method (IMP). For HP specimens, silica was dispersed into epoxy resin using homogenizer before being applied to the kenaf mat and subsequently hot pressed. While for IMP specimens, the kenaf mat was placed inside the silica/epoxy solution under 600 mm Hg impregnation pressure before being hot pressed. The results for flexural properties revealed that IMP specimen with 40 vol% of kenaf fibre and 5 vol% of silica have the highest strength and modulus at 78.6 MPa and 5.11 GPa respectively. Same trend can be seen for compressive properties as the same specimen had the highest compressive strength and modulus at 69.3 MPa and 1.81 GPa respectively. Finally for water absorption properties, IMP specimens had a reduction in water uptake compared to its HP specimen counterparts with the same kenaf and silica content. IMP specimen with 60 vol% kenaf and 5 vol% silica had the lowest water uptake after 90 days of immersion in distilled water at 13.5% increase in weight.

Fabrication of Fe3O4@SiO2@RGO nanocomposites and their excellent absorption properties with low filler content

RSC Advances ◽  
2015 ◽  
Vol 5 (88) ◽  
pp. 71718-71723 ◽  
Author(s):  
Ya-Fei Pan ◽  
Guang-Sheng Wang ◽  
Yong-Hai Yue
Keyword(s):  
Reflection Loss ◽  
Filler Content ◽  
Absorption Properties ◽  
Minimum Reflection Loss

The minimum reflection loss of Fe3O4@SiO2@RGO nanocomposites can reach −26.6 dB at 9.7 GHz with low filler content; the mechanism was also explained.

Hot-Press Method Applied to Anisotropy of Compressed Carbon Product

1968 ◽  
Vol 17 (177) ◽  
pp. 536-539
Author(s):  
Shinichi OTSUKI ◽  
Shoji HORI ◽  
Kanji MATSUO
Keyword(s):  
Hot Press ◽  
Carbon Product ◽  
Press Method

Controllable synthesis and photocatalytic activity of ZnO nanorods

2016 ◽  
Vol 504 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Yimin Wang ◽  
Hongbo Zhang ◽  
Shanshan Qu ◽  
Chunhui Su
Keyword(s):  
Photocatalytic Activity ◽  
Zno Nanorods ◽  
Controllable Synthesis

Enhanced Thermal Conductivity of Composite Materials by Filling Sheet and Fiber Under Effect of Filler Contact

2021 ◽  
Author(s):  
Xiao-jian Wang ◽  
Liang-Bi Wang
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Composite Materials ◽  
Thermal Resistance ◽  
Percolation Threshold ◽  
Filler Content ◽  
Interfacial Thermal Resistance ◽  
Combined Effects ◽  
Enhanced Thermal Conductivity ◽  
The Ideal

Abstract The most common non-granular fillers are sheet and fiber. When they are distributed along the heat flux direction, the thermal conductivity of composite increases greatly. Meanwhile, the filler contact also has large effect on the thermal conductivity. However, the effect of filler contact on the thermal conductivity of composite with directional fillers has not been investigated. In this paper, the combined effects of filler contact, content and orientation are investigated. The results show that the effect of filler orientation on the thermal conductivity is greater than filler contact in low filler content, and exact opposite in high filler content. The effect of filler contact on fibrous and sheet fillers is far greater than cube and sphere fillers. This rule is affected by the filler contact. The filler content of 8% is the ideal percolation threshold of composite with fibrous and sheet filler. It is lower than cube filler and previous reports. The space for thermal conductivity growth of composite with directional filler is still very large. The effect of interfacial thermal resistance should be considered in predicting the thermal conductivity of composite under high Rc (>10-4).

Magnetization and Microwave Absorption Properties of La0.67 Sr0.33 MnO3 with Different Particle Size

2011 ◽  
Vol 374-377 ◽  
pp. 1541-1544 ◽  
Author(s):  
Yu Lan Cheng ◽  
Ping Xia ◽  
Ke Xiang Wei ◽  
Quan Bai
Keyword(s):  
Particle Size ◽  
Sinter Temperature ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Measured Frequency Range ◽  
Maximum Reflection Loss

La 0.67 Sr 0.33 MnO 3 particles with different particle size have been prepared by sol-gel method. The structure, magnetization and microwave absorption properties have been investigated. The results show that the particle size can be controlled by sinter temperature. The peaks of the maximum reflection loss (RL) move to higher frequency regions with increasing particle size. The value of the maximum RL is -32 dB at 10.2GHz with a particle size of 58.5nm. The bandwidth with a RL exceeding -8dB reached 1.6GHz in the whole measured frequency range, suggesting that La 0.67 Sr 0.33 MnO 3 particles are promising for application as a wideband and strong absorption building microwave absorber.

scholarly journals Effect of Glycidyl Methacrylate on Water Absorption Properties of Sago Hampas Biocomposite

2015 ◽  
Vol 6 (2) ◽  
pp. 34-38
Author(s):  
M. S. Jamaludin ◽  
A. Zulkharnain ◽  
A. A. Khan ◽  
N. Wagiman
Keyword(s):  
Water Absorption ◽  
Glycidyl Methacrylate ◽  
Standard Test ◽  
Test Method ◽  
Matrix Composites ◽  
Hot Press ◽  
Absorption Properties ◽  
Average Water ◽  
Absorption Percentage ◽  
Properties Of Composites

 This study examines the water absorption of sago hampas biocomposite utilizing glycidyl methacrylate as its matrix. Composites were fabricated with 25, 30, 40 wt% sago hampas content and another sample of pure sago hampas using hydraulics hot press machine. The water absorption properties of composites with different sago hampas composition were investigated according to Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials of ASTM D570. Water absorption of pure sago hampas composite have the highest average water absorption percentage with 59.1 wt% as compared to the lowest average water absorption percentage recorded for 30 wt% sago hampas content biocomposite with 16.8%. However sago hampas loading was increased resulting in the increased in average water absorption on biocomposite for 40 wt% sago hampas content which is 33.1%.

scholarly journals Preparation of Porous Hydroxyapatite Nanosolid by Solvent Hot Press Method

2004 ◽  
Vol 20 (06) ◽  
pp. 608-611
Author(s):  
Liu Xiu-Lin ◽  
◽  
Xu Hong-Yan ◽  
Meng Xian-Ping ◽  
Li Mei ◽  
...  
Keyword(s):  
Hot Press ◽  
Porous Hydroxyapatite ◽  
Press Method
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