Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

Yohanes, Yohanes; Sekiguchi, Y.

doi:10.1007/s40870-018-0148-4

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…However, an in vitro study has reported that the bigger nanoparticles promote the cellular uptake of the smaller nanoparticles with a total uptake increase of particles in the cells [ 32 ]. Additionally, some physicochemical properties could have changed when micro-particles mixed with nanoparticles [ 29 , 34 , 54 , 55 ], which may also have affected their toxicities. The increased uptake of the “more-toxic” PS50 and the total particle count may be the cause of the enhanced toxicity in the mixture of PS50 and PS500.…”

Section: Discussionmentioning

confidence: 99%

Underestimated health risks: polystyrene micro- and nanoplastics jointly induce intestinal barrier dysfunction by ROS-mediated epithelial cell apoptosis

et al. 2021

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Background Micro- and nanoplastic pollution has become a global environmental problem. Nanoplastics in the environment are still hard to detect because of analysis technology limitations. It is believed that when microplastics are found in the environment, more undetected nanoplastics are around. The current “microplastic exposure” is in fact the mixture of micro- and nanoplastic exposures. Therefore, the biological interaction between organisms among different sizes of micro- and nanoplastics should not be neglected. Results We measured the biodistribution of three polystyrene (PS) particles (50 nm PS, PS50; 500 nm PS, PS500; 5000 nm PS, PS5000) under single and co-exposure conditions in mice. We explored the underlying mechanisms by investigating the effects on three major components of the intestinal barrier (the mucus layer, tight junctions and the epithelial cells) in four intestine segments (duodenum, jejunum, ileum and colon) of mice. We found that the amounts of both PS500 and PS5000 increased when they were co-exposed with PS50 for 24 h in the mice. These increased amounts were due primarily to the increased permeability in the mouse intestines. We also confirmed there was a combined toxicity of PS50 and PS500 in the mouse intestines. This manifested as the mixture of PS50 and PS500 causing more severe dysfunction of the intestinal barrier than that caused by PS50 or PS500 alone. We found that the combined toxicity of PS micro- and nanoplastics on intestinal barrier dysfunction was caused primarily by reactive oxygen species (ROS)-mediated epithelial cell apoptosis in the mice. These findings were further confirmed by an oxidants or antioxidants pretreatment study. In addition, the combined toxicity of PS micro- and nanoplastics was also found in the mice after a 28-day repeated dose exposure. Conclusions There is a combined toxicity of PS50 and PS500 in the mouse intestines, which was caused primarily by ROS-mediated epithelial cell apoptosis in the mice. Considering that most recent studies on PS micro- and nanoplastics have been conducted using a single particle size, the health risks of exposure to PS micro- and nanoplastics on organisms may be underestimated.

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Section: Discussionmentioning

confidence: 99%

Underestimated health risks: polystyrene micro- and nanoplastics jointly induce intestinal barrier dysfunction by ROS-mediated epithelial cell apoptosis

et al. 2021

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“…In polymer‐based composites, ceramics are selected as fillers because they have properties that can strengthen the polymeric matrix. One such ceramic is silica (SiO 2 ), which is abundant and has a relatively high specific tensile strength . Furthermore, silica has several types of polymorphs, including quartz and cristobalite .…”

Section: Introductionmentioning

confidence: 99%

Dynamic tensile and shear storage moduli of PEG/silica‐polymorph composites

Fauziyah

Hilmi

Fadly

et al. 2018

J of Applied Polymer Sci

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The effect of silica polymorphs on the thermomechanical properties of 0, 5, 10, and 20 wt % silica particles-reinforced-based poly(ethylene glycol) (PEG) composites have been studied as a function of temperature using dynamic mechanical analysis (DMA). The silica polymorphs exhibited quartz (Q), cristobalite (C), and amorphous (A) phases, which were obtained by processing natural silica sand. The DMA thermomechanical properties were determined in tensile (E) and shear (G) modes. The maximum storage moduli (E 0 and G 0 ) were achieved by samples with 20 wt % silica for all type of fillers. These values increased approximately 12 times for PEG/Q, 10 times for PEG/A, and 11 times for PEG/C composites compared to the pure PEG. Furthermore, the Poisson's ratio values of the composites were filler phase dependent, that is, 0.39-0.47 for PEG/Q, 0.15-0.18 for PEG/A, and somewhat anomalous for PEG/C composites.

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“…Therefore, the stress-strain curve shown in Fig. 6 does not show perfectly closed-loop curve as expected from the viscoelasticity effect of the epoxy adhesive [4,16,17]. The remaining strain in the stress-strain diagram does not represent the plastic deformation either.…”

Section: Methodsmentioning

confidence: 84%

“…Utilizing the bulk adhesive of a higher modulus produces stiffer and stronger adhesive joints for a given adherend [1]. Then, some researchers improves the modulus of bulk epoxy adhesives by filling the epoxy adhesive with silica particles [2][3][4]. Adhesive joints also sensitive to the loading rate [5,6].…”

Section: Introductionmentioning

confidence: 99%

Non-Monotonous Effect of Adhesive Thickness on The Dynamic Stiffness of Adhesive Butt Joint

Yohanes

Pramono

Hudayya

2020

KEM

Self Cite

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This research investigated the effect of the thickness of adhesive to the stiffness (Young’s modulus) of adhesive butt joint at high strain rate loading. A split Hopkinson pressure bar (SHPB) test is used to obtain the stress-strain response of join specimen at strain rate of 530±10 s-1. The joint is composed of aluminum adherend bonded by epoxy adhesive with 0.5, 1, 2, and 3 millimeter of thickness variation. The results show that the joint deformed elastically and the stiffness increases with the increase of adhesive thickness. However, the rate at which the stiffness increases with thickness decreases at thick adhesive layer. The facts of this research are important for the improvement of the crashworthiness of structure such as automobile structures.

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Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

Cited by 8 publications

References 32 publications

Underestimated health risks: polystyrene micro- and nanoplastics jointly induce intestinal barrier dysfunction by ROS-mediated epithelial cell apoptosis

Underestimated health risks: polystyrene micro- and nanoplastics jointly induce intestinal barrier dysfunction by ROS-mediated epithelial cell apoptosis

Dynamic tensile and shear storage moduli of PEG/silica‐polymorph composites

Non-Monotonous Effect of Adhesive Thickness on The Dynamic Stiffness of Adhesive Butt Joint

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