An inorganic anionic polymer filter disc: direct crystallization of a layered silicate nanosheet on a glass fiber filter

Okada, Tomohiko; Shimizu, K.; Yamakami, Tomohiko

doi:10.1039/c5ra25626g

Cited by 17 publications

(11 citation statements)

References 51 publications

(65 reference statements)

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“…These behaviors might be ascribed to the enhanced bonding ability between WPCBP and the PP matrix due to the in-situ hybridization of SiO 2 . On the other hand, with ammonia as promoter during the complexing reaction, the content of transition metals in the resultant TSW powder was low, which can also increase the OIT values of modified PP/TSW composites [24,25]. These findings are also consistent with the color change results in the hybrids filler solution and the XRF analysis of the hybrids.…”

Section: Oxidation Induction Time Of Pp Compositesupporting

confidence: 76%

Fabrication and Mechanical Properties of High-Durability Polypropylene Composites via Reutilization of SiO2 In-Situ-Synthesized Waste Printed Circuit Board Powder

Tian

et al. 2022

Polymers

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This paper focuses on the characterization of the physico-chemical properties, surface modification, residual copper content and in situ hybrid inorganic particle modification of polypropylene (PP) composites reinforced by waste printed circuit board powder (WPCBP). A series of WPCBP/SiO2 hybrids (TSW) were prepared by a sol–gel method at different pH values. Characterization results revealed the in situ generation of SiO2 on the surface of WPCBP, and showed that with an increase in pH value, the size of SiO2 particles increased gradually and the copper content decreased in the TSW powder. The mechanical properties, oxidation induction time (OIT) and thermal properties of PP composites were improved by reinforcement with TSW, which might be ascribed to the formation of serrated interfaces. This work not only develops a powerful method to enhance the properties of PP/WPCBP composites, but also provides an environmentally sustainable approach to the high-added-value reutilization of WPCBP.

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Section: Oxidation Induction Time Of Pp Compositesupporting

confidence: 76%

Fabrication and Mechanical Properties of High-Durability Polypropylene Composites via Reutilization of SiO2 In-Situ-Synthesized Waste Printed Circuit Board Powder

Tian

et al. 2022

Polymers

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“…A glass fiber filter disc has been applicable to the in situ crystallization of Hect by immersing the filter disc in an aqueous solution containing LiF, MgCl 2 , and urea at 373 K for 48 h . We demonstrated the cation‐exchange ability from Eu 3+ adsorption, because the quantitative ion‐exchange has been reported in related layered silicates .…”

Section: Direct (In Situ) Crystallization Of Layered Silicates On Amomentioning

confidence: 84%

“…The layered silicate was firmly glued onto the silica particles because the Hect with MB did not flake off from the product . Firm immobilization of Hect on the fiber silica was also confirmed by immersing in aqueous LiCl solution for a long period . A sheet of the filter disc sample (Figure d ) was immersed in LiCl aqueous solution (12 mM) for 3 weeks at room temperature.…”

Section: Direct (In Situ) Crystallization Of Layered Silicates On Amomentioning

confidence: 89%

“…We have expertise in the crystal growth of Hect on silica using the silica fiber filter disc by changing the molar LiF : MgCl 2 : urea : SiO 2 ratio for discussing 1) Hect amount on silica, 2) negative layer charge density of Hect, and 3) dissolution of the silica substrate (mechanical strength of the fibers) . The results corresponding the aspects are 1) the Hect on the fibers became thick on adding increasing amounts of LiF and MgCl 2 ; 2) by increasing the molar LiF/MgCl 2 ratio, the negative charge density of Hect increased, following the trend of caffeine adsorption in water; 3) the amount of urea added to the starting solution affected to prevent a loss in the mechanical strength of the fibers (e. g., fracture due to unnecessary dissolution of the silica fiber as shown in Figure a) and emerging side‐reactions (e. g., polymerization of silica sol to yield spherical silica particles as shown in a SEM image of Figure b and schematically represented in Figure c).…”

Section: Direct (In Situ) Crystallization Of Layered Silicates On Amomentioning

confidence: 99%

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Direct Crystallization of Layered Silicates on the Surface of Amorphous Silica

Okada

2017

The Chemical Record

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We overview the entire surface coverage of amorphous silica with layered silicates (smectite-like) using the direct crystallization technique under hydrothermal conditions. Various shapes (e. g., microspheres, fibers, microcapsules) have been available as the silica substrates, which involve partial dissolution triggered by the hydrolysis of urea for supplying a source of the layered silicates. Other sources (e. g., Li , Mg , Al ) have been supplied from aqueous solutions, participating the heterogeneous nucleation of the layered silicates. Because of partial dissolution of the silica substrates, the original shape has been preserved after the hydrothermal reactions. Cation exchange reactions, usually observed for conventional smectite systems, occurred by replacing the interlayer cations in the silicates with metal (a rare-earth ion) and organic (a quaternary long-chain alkylammonium, methylene blue, and a tris-chelated complex) cations. We have discussed the mechanism of the crystallization and displayed some applications of the hybrids (e. g., chiral discrimination, filtering, and magnetic recovery).

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“…A procedure was reported that has been described in the previous paper. 38 Each of the hydrothermal products (1.0 g) was immersed into a 100 mL solution of 12 mM LiCl inside a glass vessel and magnetically stirred for 24 h at room temperature. Once a precipitate formed, this was separated out using centrifugation at 1400g for 10 min.…”

Section: ■ Introductionmentioning

confidence: 99%

Hydrated Silicate Layer Formation on Mica-Type Crystals

Sugiura

Sueyoshi²,

Seike³

et al. 2020

Langmuir

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This study aims to investigate the growth of a cation-exchangeable hydrated layer on the surface of mica-type silicates based on a synthetic fluorophlogopite and a natural muscovite. Through the reaction of a synthetic fluorophlogopite using LiF, MgCl2, and a silica sol in water at 373 K for 48 h in the presence of urea, a hydrated phyllosilicate was formed on the fluoromica. As a result of examining the reaction in the alkali solution in the absence of Mg2+, the uptake of the silica sol would be included as a chemical process to begin the crystallization on fluorophlogopite because the lithium and ammonium ions (generated by urea hydrolysis) are known to contribute to enhanced adsorption. We found that the urea hydrolysis increased the pH, which, in turn, assisted the formation of magnesium hydroxide after the isomorphic substitution of Li+ for Mg2+. Bridging tetrahedral SiO4 with a magnesium–lithium double hydroxide afforded a 1 nm silicate layer. This facilitated the hectorite-like hydrated silicate layer to adhere closely to both the crystal edge and the cleaved face of the synthetic mica, which was found to coat the surface homogeneously. Only surface crystals were found to form through this process. The layered silicates included exchangeable hydrated cations for the cation-exchange reactions to expand the interlayer space by a cationic surfactant, dimethyldistearylammonium. The layered silicate also adsorbed methylene blue as a cationic dye in the aqueous phase. Apart from fluoromica, the natural muscovite also provided the surface to grow hydrated silicate layers, as a crystal turned dense blue when reacted with methylene blue.

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An inorganic anionic polymer filter disc: direct crystallization of a layered silicate nanosheet on a glass fiber filter

Abstract: Cation-exchangeable layered silicate nanosheet fine crystals covered thoroughly a commercially available silica fiber filter paper through hydrothermal reactions with LiF, MgCl2 and urea.

Cited by 17 publications

References 51 publications

Fabrication and Mechanical Properties of High-Durability Polypropylene Composites via Reutilization of SiO2 In-Situ-Synthesized Waste Printed Circuit Board Powder

Fabrication and Mechanical Properties of High-Durability Polypropylene Composites via Reutilization of SiO2 In-Situ-Synthesized Waste Printed Circuit Board Powder

Direct Crystallization of Layered Silicates on the Surface of Amorphous Silica

Hydrated Silicate Layer Formation on Mica-Type Crystals

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