Effects of addition of silica nanospheres on mechanical properties of clay/sodium polyacrylate hydrogels

Takeno, H.; Aoki, Yukinari; Kimura, Kazuhiko

doi:10.1016/j.mtcomm.2021.102710

Cited by 6 publications

(6 citation statements)

References 27 publications

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“…The obtained parameters are summarized in Table 1 . The values of R ave for both gels are close to that of the isolated SiO 2 nanosphere (22.3 Å) evaluated in a previous paper [ 27 ]. This result suggests that the flocculation of the SiO 2 nanospheres did not occur much in the composite gels.…”

Section: Resultssupporting

confidence: 85%

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Mechanical Performance of Corn Starch/Poly(Vinyl Alcohol) Composite Hydrogels Reinforced by Inorganic Nanoparticles and Cellulose Nanofibers

Takeno

Shikano

Kikuchi

2022

Gels

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We investigated the mechanical properties of corn starch (CS)/poly(vinyl alcohol) (PVA)/borax hydrogels reinforced by clay platelets, silica (SiO2) nanospheres, or cellulose nanofibers (CNFs). The effects of these reinforcing agents on the tensile properties of the hydrogels were quite different; the fracture stress of SiO2/CS/PVA/borax composite hydrogels increased with SiO2 concentration, whereas that of clay/CS/PVA/borax composite hydrogels was high at a low clay concentration but low at high clay concentrations; for CNF/CS/PVA/borax composite hydrogels, although the elastic modulus was highly enhanced by adding CNF, the fracture stress was very low because of the stress relaxation during the elongation. This result came from differences in the dispersibility of each filler and the reinforcing ability. These composite hydrogels were constructed by multi-crosslinking, such as hydrogen bonding between CS and PVA, CS and PVA crystals, complexation between borate and PVA (partly CS), and the crosslinking between each filler and polymer. The self-healing ability of SiO2 and clay composite hydrogels was examined. As a result, the SiO2/CS/PVA/borax composite hydrogels possessed an excellent self-healing ability, whereas the clay/CS/PVA/borax composite hydrogels had a poor self-healing ability.

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Section: Resultssupporting

confidence: 85%

“…In addition, we considered the Gauss distribution, with the mean radius R ave and the standard deviation σ sphere for the size heterogeneities of the spheres. The details of the PY equations are described elsewhere [ 27 ]. The upturn of the scattering intensity at low q ’s cannot be expressed by the PY model.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Performance of Corn Starch/Poly(Vinyl Alcohol) Composite Hydrogels Reinforced by Inorganic Nanoparticles and Cellulose Nanofibers

Takeno

Shikano

Kikuchi

2022

Gels

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“…Figure 4 c,d show the FT-IR spectra for the cPVA/ac-SiO 2 and ChsNF/cPVA systems. The characteristic bands observed at 1077 and 791 cm −1 for pure ac-SiO 2 were ascribed to antisymmetric and symmetric Si-O-Si (or Si-O-Al) stretching vibrations [ 13 , 22 , 23 , 24 ]. The characteristic band at 3314 cm −1 for pure cPVA was assigned to the stretching vibration of hydrogen-bonded hydroxyl groups, whereas the band at 1586 cm −1 was assigned to the COO – antisymmetric stretching vibration [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, we adopted the Percus–Yevick (PY) hard-sphere model [ 34 ] to calculate the structure factor S ( q ). The detailed representation of the function was described elsewhere [ 13 , 14 ]; in short, the function can be expressed using parameters of an interaction radius R HS and the volume fraction of spheres ϕ .…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, our previous studies clarified that the molecular mass of the constituent polymer is a key factor in the enhancement of mechanical performance [ 11 , 12 ]. Besides, we recently reported that composite hydrogels using two kinds of reinforcing agents such as clay and silica nanoparticles were robust and highly stretchable [ 13 , 14 ]; two identically charged nanoparticles formed multiple crosslinking and suppressed inhomogeneities in the composite hydrogels [ 13 , 14 ]. Thus, the construction of the gel network by multiple crosslinking was effective in fabricating tough polymer hydrogels.…”

Section: Introductionmentioning

confidence: 99%

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Robust and Highly Stretchable Chitosan Nanofiber/Alumina-Coated Silica/Carboxylated Poly (Vinyl Alcohol)/Borax Composite Hydrogels Constructed by Multiple Crosslinking

Takeno

Suto

2021

Gels

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We investigated the mechanical and structural properties of composite hydrogels composed of chitosan nanofiber (ChsNF), positively charged alumina-coated silica (ac-SiO2) nanoparticles, carboxylated poly (vinyl alcohol) (cPVA), and borax. ChsNF/cPVA/borax hydrogels without ac-SiO2 exhibited high Young’s modulus but poor elongation, whereas cPVA/ac-SiO2/borax hydrogels without ChsNF had moderate Young’s modulus but high elongation. ChsNF/ac-SiO2/cPVA/borax hydrogels using both ChsNF and ac-SiO2 as reinforcement agents exhibited high extensibility (930%) and high Young′s modulus beyond 1 MPa at a high ac-SiO2 concentration. The network was formed by multiple crosslinking such as the complexation between borate and cPVA, the ionic complexation between ac-SiO2 and cPVA, and the hydrogen bond between ChsNF and cPVA. Structural analysis by synchrotron small-angle X-ray scattering revealed that the nanostructural inhomogeneity in ChsNF/ac-SiO2/cPVA/borax hydrogel was suppressed compared to those of the ChsNF/cPVA/borax and cPVA/ac-SiO2/borax hydrogels.

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Quasi‐Liquid Gel Electrolyte for Enhanced Flexible Zn–Air Batteries

Shang

Wang

Wei

et al. 2023

Adv Funct Materials

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Flexible Zn–air batteries (FZABs) have attracted more attention due to their high specific energy, excellent stability, and unique rechargeability. However, these batteries are limited by the low conductivity of the gel electrolytes used. Here a quasi‐liquid gel with ionic conductivity comparable to liquid electrolytes is presented. The gel pore structure is guided and modified in situ with large‐size silica to achieve clear and unbroken pores. The reduced skeleton structure leads to a significant increase in ionic conductivity to 562.6 mS cm−1, enabling a peak power density of 154 mW cm−2 and a cycle life of over 40 h with a low charge–discharge gap. The FZABs also exhibit a high lifetime and potential advantages in 10 mA cm−2 charge/discharge testing, and demonstrate excellent performance in practical applications. This study offers new possibilities for developing high‐performance quasi‐liquid gels and innovative concepts for FZABs.

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Effects of addition of silica nanospheres on mechanical properties of clay/sodium polyacrylate hydrogels

Cited by 6 publications

References 27 publications

Mechanical Performance of Corn Starch/Poly(Vinyl Alcohol) Composite Hydrogels Reinforced by Inorganic Nanoparticles and Cellulose Nanofibers

Mechanical Performance of Corn Starch/Poly(Vinyl Alcohol) Composite Hydrogels Reinforced by Inorganic Nanoparticles and Cellulose Nanofibers

Robust and Highly Stretchable Chitosan Nanofiber/Alumina-Coated Silica/Carboxylated Poly (Vinyl Alcohol)/Borax Composite Hydrogels Constructed by Multiple Crosslinking

Quasi‐Liquid Gel Electrolyte for Enhanced Flexible Zn–Air Batteries

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