Effect of microstructural damage on the mechanical properties of silica nanoparticle-reinforced silicone rubber composites

Chen, Jinhan; Liu, Jian; Yao, Yin; Chen, Shaohua

doi:10.1016/j.engfracmech.2020.107195

Cited by 39 publications

(21 citation statements)

References 61 publications

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“…As for gecko adhesion in real-world conditions, the sizes of dust particles and other contaminants on the real surfaces are usually on the micrometer or submicrometer scale because nanoscale dust aggregates and forms clusters on the scale of micrometers owing to the strong surface effect of nanoscale particles. 39 The size of the gecko spatula is approximately 200 nm 2 . Therefore, the dust attached to the gecko spatula is similar to the case of large microparticles on our fabricated micropillararrayed surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Self-Cleaning Performance of the Micropillar-Arrayed Surface and Its Micro-Scale Mechanical Mechanism

Wang

et al. 2021

Langmuir

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The exceptional adhesive ability of geckos remains almost uninfluenced by contaminated surfaces, showing that the adhesion system of geckos has self-cleaning properties. Although there have been several studies on the self-cleaning performance of geckos and gecko-inspired synthetic adhesives, the microscale mechanical mechanism of self-cleaning is still unclear. In the present study, a micropillar-arrayed surface is fabricated using a template molding method to investigate its self-cleaning performance in a load-pull contact process. The effects of preload, microparticle size on self-cleaning properties are studied. The self-cleaning efficiency of the micropillar-arrayed surface is found to increase with an increase in the microparticle size. For large and small microparticles, self-cleaning efficiency increases with an increase in the preload. For medium microparticles, self-cleaning efficiency first increases and then decreases as the preload increases. The mechanical mechanism underlying such self-cleaning performance is further elucidated; it is mainly attributed to the competition among the elastic energy stored in the micropillars induced by the bending deformation, the interfacial adhesion energy between the microparticles and the deformed micropillars, and the interfacial adhesion energy between the microparticles and substrate, as well as the varying contact states between the microparticles and the deformed micropillars. The preload can not only change the contact states between the microparticles and the micropillar-arrayed surface but also influence the bending elastic energy stored in the micropillars. The results obtained in the present study can help deeply understand the self-cleaning mechanism of micropillar-arrayed surfaces as well as provide a guideline for designing functional surfaces with high self-cleaning efficiency.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Self-Cleaning Performance of the Micropillar-Arrayed Surface and Its Micro-Scale Mechanical Mechanism

Wang

et al. 2021

Langmuir

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“…Some of the most used materials for flexible dielectrics are polysiloxanes, such as poly(dimethylsiloxane) (PDMS), which are characterized by a fully saturated backbone of alternating silicon and oxygen atoms. This structure results in excellent properties, such as a high elasticity even at low-temperature, high-temperature resistance, resistance to radiation, chemicals and climatic constraints, easy processability and biocompatibility [ 10 , 11 , 12 , 13 , 14 , 15 ]. However, the mechanical properties, and especially the stiffness, of unfilled polysiloxanes are poor.…”

Section: Introductionmentioning

confidence: 99%

“…Nanosilica has commonly been used to modify the mechanical properties of polysiloxanes due to its good price–performance ratio [ 13 , 14 ]. The size of the silica particles has a strong influence on the mechanical properties of polysiloxane composites; in one study, a monotonic increase of the tensile and tear strengths along with fracture toughness of polysiloxane composites was observed when the size of silica particles decreased from 500 to 20 nm [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…The size of the silica particles has a strong influence on the mechanical properties of polysiloxane composites; in one study, a monotonic increase of the tensile and tear strengths along with fracture toughness of polysiloxane composites was observed when the size of silica particles decreased from 500 to 20 nm [ 2 ]. The nanosilica can bond to the polysiloxane chains through physical (van der Waals and hydrogen bonding) or chemical bonds, resulting a complex network [ 2 , 13 , 21 ]. Although polysiloxanes have a very low surface energy and weak adhesion properties, the interfacial interactions between PDMS and silica may determine a better effect of this filler compared to other inorganic particles.…”

Section: Introductionmentioning

confidence: 99%

“…Pioneering work has shown a broad distribution of particle sizes in silica-reinforced silicone rubber and the presence of large aggregates, 20–30 µm in size [ 23 ]. Several routes were tested to improve the dispersion of micro- and nanosilica particles in polysiloxanes, such as: (i) mechanical blending of nanosilica with PDMS suspension followed by crosslinking [ 24 ]; (ii) in situ sol–gel process for the generation of silica particles in the polysiloxane [ 25 , 26 ]; (iii) ultrasonication and miniemulsion polymerization with core–shell silica nanoparticles encapsulated by PDMS [ 27 ]; (iv) surface modification of nanosilica by grafting silane coupling agents [ 2 , 13 ] or other modifiers, such as fatty alcohols [ 28 ], and then blending with the silicon rubber; (v) addition of a silicone oil to decrease filler–filler interactions and irradiation crosslinking [ 29 ]; (vi) anionic ring-opening polymerization of dimethylcyclosiloxane and nanosilica addition followed by crosslinking [ 21 ]; or (vii) addition of an adhesion promoter and surface modified silica nanoparticles in the silicone rubber for improving compatibility and mechanical properties [ 30 ]. However, all these methods were not able to completely eliminate the large nanoparticle aggregates [ 24 , 25 , 26 ] or control the crosslink density and the size of silica microdomains [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices

et al. 2021

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Polymer nanodielectrics characterized by good flexibility, processability, low dielectric loss and high dielectric permittivity are materials of interest for wearable electronic devices and intelligent textiles, and are highly in demand in robotics. In this study, an easily scalable and environmentally friendly method was applied to obtain polysiloxane/nanosilica nanocomposites with a large content of nanofiller, of up to 30% by weight. Nanosilica was dispersed both as individual particles and as agglomerates; in nanocomposites with a lower amount of filler, the former prevailed, and at over 20 wt% nanosilica the agglomerates predominated. An improvement of both the tensile strength and modulus was observed for nanocomposites with 5–15 wt% nanosilica, and a strong increase of the storage modulus was observed with the increase of nanofiller concentration. Furthermore, an increase of the storage modulus of up to seven times was observed in the nanocomposites with 30 wt% nanosilica. The tensile modulus was well fitted by models that consider the aggregation of nanoparticles and the role of the interface. The dielectric spectra showed an increase of the real part of the complex relative permittivity with 33% for 30 wt% nanosilica in nanocomposites at a frequency of 1 KHz, whereas the loss tangent values were lower than 0.02 for all tested nanodielectrics in the radio frequency range between 1 KHz and 1 MHz. The polysiloxane–nanosilica nanocomposites developed in this work showed good flexibility; however, they also showed increased stiffness along with a stronger dielectric response than the unfilled polysiloxane, which recommends them as dielectric substrates for wearable electronic devices.

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Construction of Multifunctional Composites for Electromagnetic Shielding and Infrared Stealth Based on Magnetic Phase Change Capsules and Silicone Rubber Foam

Zhang

Liu

Yang

et al. 2023

Adv Materials Technologies

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Functionalization of phase change capsules is recognized as one of the promising technologies to improve energy efficiency and promote their versatile application. Herein, a new magnetic phase change capsule (NiFe 2 O 4 -encapsulated phase change material (EPCM)) composed of paraffin wax core and SiO 2 -NiFe 2 O 4 double-layer shell is designed. The prepared NiFe 2 O 4 -EPCMs possess sensitive magnetic response, excellent thermal management performance, and enhanced thermal stability. In particular, the representative NiFe 2 O 4 -EPCM-4 has the highest saturation magnetization (8.41 emu • g −1 ) and high enthalpy of 131.2 J • g −1 . Subsequently, NiFe 2 O 4 -EPCM-4 is introduced into silicone rubber foam (SRF) matrix and magnetic composite SRFs (MSRFs) are prepared. The latent heat of MSRF-3 containing 30% NiFe 2 O 4 -EPCM-4 can reach 28.9 J g −1 and there is almost no change even after 200 cycles. In comparison with pure SRF, the tensile strength and compressive strength of MSRF-3 are increased by 167.7% and 941.8%, respectively. Importantly, the electromagnetic interference shielding effectiveness of MSRF-3 is significantly improved from 15.9 to 30.6 dB. Besides, the MSR-3 can achieve an intriguing infrared stealth function for targets both in human body temperature and high temperature environment. Therefore, this work might stimulate people's interest and inspiration in the design and preparation of multifunctional phase change capsules.

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Effect of microstructural damage on the mechanical properties of silica nanoparticle-reinforced silicone rubber composites

Cited by 39 publications

References 61 publications

Self-Cleaning Performance of the Micropillar-Arrayed Surface and Its Micro-Scale Mechanical Mechanism

Self-Cleaning Performance of the Micropillar-Arrayed Surface and Its Micro-Scale Mechanical Mechanism

Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices

Construction of Multifunctional Composites for Electromagnetic Shielding and Infrared Stealth Based on Magnetic Phase Change Capsules and Silicone Rubber Foam

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