scholarly journals Characteristics, Compression, and Buffering Performance of Pomelo-Like Hierarchical Capsules Containing Shear Thickening Fluid

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1138 ◽  
Author(s):  
Ting-Ting Li ◽  
Junli Huo ◽  
Xing Liu ◽  
Hongyang Wang ◽  
Bing-Chiuan Shiu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Shear Thickening ◽  
Fickian Diffusion ◽  
Processing Temperature ◽  
Environment Friendly ◽  
Shear Thickening Fluid ◽  
Swelling Capacity ◽  
Swelling Coefficient ◽  
Kinetic Release ◽  
Kinetic Diffusion

In this study, a double-walled and pomelo-like hierarchical shear thickening fluid (STF) is successfully encapsulated using the simple and environment-friendly calcium alginate encapsulation technique by instilling STF into sodium alginate (SA) and crosslinking by calcium chloride solution. The encapsulated STF has a pomelo-like structure with a shell thickness of 2.9 μm and core pores with a size of 21.43 μm. The effect of the size of STF capsules (2.10, 1.89, 1.86, 1.83, 1.73, and 1.63 mm) is explored in terms of thermal stability, swelling capacity, mechanical property, and release performance. The buffering performance of different sizes of STF-containing capsules is also investigated. The pomelo-like STF capsules can withstand a processing temperature of 250 °C. With a decrease in particle size, the compression strain energy slowly increases first and then rapidly enhances. The kinetic release of pomelo-like STF capsules conforms to Fickian diffusion. STF-containing capsules with a diameter of 1.83 mm present the greatest thermal stability, the highest STF amount, the maximum swelling coefficient, and the fastest kinetic diffusion. STF-containing capsules also have an improved buffering performance in PU foam. This capsule has the best comprehensive performance and can adapt to diversified applications, such as personnel armor and other protective sports equipment.

A comparative study performance of cationic organic montmorillonite prepared by different methods

2018 ◽  
Vol 25 (1) ◽  
pp. 53-58 ◽  
Author(s):  
Daojin Zhou ◽  
Zepeng Zhang ◽  
Jialun Tang ◽  
Sanqin Wu ◽  
Jiali Zhao
Keyword(s):  
Thermal Stability ◽  
Contact Angle ◽  
Comparative Study ◽  
Environment Friendly ◽  
Organic Montmorillonite ◽  
Loop Area ◽  
Structures And Properties ◽  
Swelling Capacity ◽  
Study Performance

AbstractIn this paper, cationic organic montmorillonites (OMts) were prepared by dry, semi-dry, and wet methods. The structures and properties of these OMts according to the modification methods were studied. By the characterization of XRD, TG-DTA, lipophilicity, and thixotropy, the results showed that cationic OMt prepared by wet method with sufficient surfactants had better properties, including contact angle, swelling capacity, thixotropic loop area, and thermal stability compared with cationic OMt prepared by dry and semi-dry methods. Attention should be paid that with low ratio amount of surfactants used, cationic OMt prepared by the semi-dry method had favorable properties compared with cationic OMt prepared by wet method, and it had the potential to be applied in industrial field due to its environment-friendly and modification efficiency characteristics.

Development of Flexible Extremities Protection utilizing Shear Thickening Fluid/Fabric Composites

2012 ◽  
Author(s):  
Mahesh Hosur ◽  
Norman Wagner ◽  
C. T. Sun ◽  
Vijaya Rangari ◽  
Jack Gillespie ◽  
...  
Keyword(s):  
Shear Thickening ◽  
Shear Thickening Fluid ◽  
Fabric Composites

Dynamic compressive response of 3D GFRP composites with shear thickening fluid (STF) matrix as cushioning materials

2021 ◽  
pp. 002199832098424
Author(s):  
Mohsen Jeddi ◽  
Mojtaba Yazdani
Keyword(s):  
Shear Thickening ◽  
Low Velocity Impact ◽  
Gfrp Composites ◽  
High Concentration ◽  
Low Velocity ◽  
Shear Thickening Fluid ◽  
Compressive Response ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Shear Thickening Fluids

Whereas most previous studies have focused on improving the penetration resistance of Shear Thickening Fluids (STFs) treated composites, in this study, the dynamic compressive response of single and multi-ply 3 D E-Glass Fiber Reinforced Polymer (GFRP) composites with the STF matrix was investigated by using a drop-weight low-velocity impact test. The experimental results revealed the STF improved the compressive and cushioning performance of the composites such that with increasing its concentration, further improvement was observed. The five-ply composite containing the STF of 30 wt% silica nanoparticles and 1 wt% carbon nanotubes (CNTs) reduced the applied peak force by 56% and 26% compared to a steel plate and five-ply neat samples, respectively. A series of repeated impacts was performed, and it was found that the performance of high-concentration composites is further decreased under this type of loading.

Impact resistance of shear thickening fluid/Kevlar composite treated with shear-stiffening gel

2018 ◽  
Vol 106 ◽  
pp. 82-90 ◽  
Author(s):  
Qianyun He ◽  
Saisai Cao ◽  
Yunpeng Wang ◽  
Shouhu Xuan ◽  
Pengfei Wang ◽  
...  
Keyword(s):  
Impact Resistance ◽  
Shear Thickening ◽  
Shear Thickening Fluid

scholarly journals Normal lubrication force between spherical particles immersed in a shear-thickening fluid

2018 ◽  
Vol 30 (12) ◽  
pp. 123102 ◽  
Author(s):  
A. Vázquez-Quesada ◽  
N. J. Wagner ◽  
M. Ellero
Keyword(s):  
Shear Thickening ◽  
Spherical Particles ◽  
Shear Thickening Fluid

scholarly journals The rheological properties of shear thickening fluid reinforced with SiC nanowires

2017 ◽  
Vol 7 ◽  
pp. 3369-3372 ◽  
Author(s):  
Jianhao Ge ◽  
Zhuhua Tan ◽  
Weihua Li ◽  
Hang Zhang
Keyword(s):  
Rheological Properties ◽  
Shear Thickening ◽  
Shear Thickening Fluid ◽  
Sic Nanowires

Confined compression behaviour of a shear thickening fluid with concentrated submicron particles

2018 ◽  
Vol 10 ◽  
pp. 186-189 ◽  
Author(s):  
Kunkun Fu ◽  
Xiaoyu Cui ◽  
Y.X. Zhang ◽  
Lin Ye ◽  
Li Chang ◽  
...  
Keyword(s):  
Shear Thickening ◽  
Submicron Particles ◽  
Confined Compression ◽  
Shear Thickening Fluid ◽  
Compression Behaviour

scholarly journals Effect of nano-solid particles on the mechanical properties of shear thickening fluid (STF) and STF-Kevlar composite fabric

2021 ◽  
Vol 16 ◽  
pp. 155892502110448
Author(s):  
Mingmei Zhao ◽  
Jinqiu Zhang ◽  
Zhizhao Peng ◽  
Jian Zhang
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
Split Hopkinson Pressure Bar ◽  
Tensile Force ◽  
Shear Thickening ◽  
Solid Particles ◽  
Time Range ◽  
Shear Thickening Fluid ◽  
Pull Out ◽  
Diamond Particles

To analyze the effect of nano-solid particles on the mechanical properties of shear thickening fluid (STF) and its Kevlar composite fabric. In this study, nano-silica and polyethylene glycol (PEG 200) were used as dispersed and continuous phases. Nano-graphite and nano-diamond particles were used as additives to prepare STF and Kevlar composite fabric. Study the friction characteristics and rheological characteristics of STF at different temperatures. Explore the STF’s mechanical response under transient high-speed impact conditions through the split Hopkinson pressure bar experiment. The mechanical properties of STF-Kevlar fabric are studied through yarn pull-out test and burst experiments. The experimental results show that the intermolecular repulsive force of STF is enhanced under a high-temperature environment, and shear thickening effect is reduced. Nano-diamond particles strengthen the contact coupling force and contact probability between the particle clusters, so that the maximum viscosity of the system reaches 1679 Pa s, the thickening ratio reaches 318 times, and the rheological properties of the shear thickening fluid are improved. The results of the SHPB experiment show that the STF can complete a dynamic response within a 50–75 µs time range, and the maximum stress can reach 78 MPa. The bullet’s incident kinetic energy is not only transformed into thermal energy and phase change energy of solid-liquid conversion, but also into frictional energy between particles. The mechanical experiments of STF-Kevlar composite fabrics show that the tensile force value of STF5-Kevlar is the largest (10.3 N/13.5 N), and the tensile force of neat Kevlar was the smallest (4.3 N/4.9 N). The maximum bearing capacity (0.3 kN) and absorption energy (51.8 J) of Neat Kevlar are less than those of STF1-Kevlar (3.2 kN, 116.7 J) and STF3-Kevlar (1.9 kN, 88.2 J), and STF5-Kevlar (4.7 kN, 143.3 J). Fabric’s failure mode is converted from partial yarn extraction to overall deformation and rupture of the fabric. Therefore, by changing the solid additives’ parameters, the STF and the composite fabric’s mechanical properties can be effectively controlled, which provides a reference for preparing the STF and fabric composite materials.

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