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Lyu X, Seo Y, Han DH, Cho S, Kondo Y, Goto T, Sekino T. Porous Lithium Disilicate Glass-Ceramics Prepared by Cold Sintering Process Associated with Post-Annealing Technique. MATERIALS (BASEL, SWITZERLAND) 2024; 17:381. [PMID: 38255548 PMCID: PMC11154477 DOI: 10.3390/ma17020381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 01/08/2024] [Accepted: 01/10/2024] [Indexed: 01/24/2024]
Abstract
Using melt-derived LD glass powders and 5-20 M NaOH solutions, porous lithium disilicate (Li2Si2O5, LD) glass-ceramics were prepared by the cold sintering process (CSP) associated with the post-annealing technique. In this novel technique, H2O vapor originating from condensation reactions between residual Si-OH groups in cold-sintered LD glasses played the role of a foaming agent. With the increasing concentration of NaOH solutions, many more residual Si-OH groups appeared, and then rising trends in number as well as size were found for spherical pores formed in the resultant porous LD glass-ceramics. Correspondingly, the total porosities and average pore sizes varied from 25.6 ± 1.3% to 48.6 ± 1.9% and from 1.89 ± 0.68 μm to 13.40 ± 10.27 μm, respectively. Meanwhile, both the volume fractions and average aspect ratios of precipitated LD crystals within their pore walls presented progressively increasing tendencies, ranging from 55.75% to 76.85% and from 4.18 to 6.53, respectively. Young's modulus and the hardness of pore walls for resultant porous LD glass-ceramics presented remarkable enhancement from 56.9 ± 2.5 GPa to 79.1 ± 2.1 GPa and from 4.6 ± 0.9 GPa to 8.1 ± 0.8 GPa, whereas their biaxial flexural strengths dropped from 152.0 ± 6.8 MPa to 77.4 ± 5.4 MPa. Using H2O vapor as a foaming agent, this work reveals that CSP associated with the post-annealing technique is a feasible and eco-friendly methodology by which to prepare porous glass-ceramics.
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Affiliation(s)
- Xigeng Lyu
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan; (X.L.); (Y.S.); (D.H.H.); (S.C.); (Y.K.); (T.G.)
| | - Yeongjun Seo
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan; (X.L.); (Y.S.); (D.H.H.); (S.C.); (Y.K.); (T.G.)
| | - Do Hyung Han
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan; (X.L.); (Y.S.); (D.H.H.); (S.C.); (Y.K.); (T.G.)
| | - Sunghun Cho
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan; (X.L.); (Y.S.); (D.H.H.); (S.C.); (Y.K.); (T.G.)
| | - Yoshifumi Kondo
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan; (X.L.); (Y.S.); (D.H.H.); (S.C.); (Y.K.); (T.G.)
| | - Tomoyo Goto
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan; (X.L.); (Y.S.); (D.H.H.); (S.C.); (Y.K.); (T.G.)
- Institute for Advanced Co-Creation Studies, Osaka University, 1-1 Yamadaoka, Suita 565-0871, Osaka, Japan
| | - Tohru Sekino
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan; (X.L.); (Y.S.); (D.H.H.); (S.C.); (Y.K.); (T.G.)
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Sun B, Chen W, Zhang H, Elmarakbi A, Fu YQ. Li2Si2O5 Nano-brush Coated Carbon Cloth as a Potential Solution for Wastewater Treatment. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.123085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Coutino-Gonzalez E, Ávila-Gutiérrez M, Hernández-Palomares A, Olvera LI, Rodríguez-Valadez FJ, Espejel-Ayala F. Biodiesel Production Using Lithium Metasilicate Synthesized from Non-Conventional Sources. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6753. [PMID: 36234094 PMCID: PMC9571811 DOI: 10.3390/ma15196753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/13/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
A facile and versatile process to produce lithium metasilicate (Li2SiO3) from non-conventional silicon sources (two different sand sources from the central area of México) was developed. The synthesis protocol based on a solid-state reaction followed by a hydrothermal treatment resulted in highly pure lithium metasilicate, as corroborated by XRD, SEM-EDS, and XPS analysis. Furthermore, lithium metasilicate was used as a heterogeneous catalyst for biodiesel production from soybean oil, where conversion yields were compared according to the silicon source used (based on chemical purity, stability, and yield efficiency). The best performing metasilicate material displayed a maximum of 95.5% of biodiesel conversion under the following conditions: 180 min, 60 °C, 5% catalyst (wt./wt., catalyst-to-oil), and 18:1 (methanol:oil). This contribution opens up alternatives for the production of lithium metasilicate using non-conventional precursors and its use as an alternative catalyst in biodiesel production, displaying better chemical stability against humidity than conventional heterogeneous catalysts.
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Affiliation(s)
- Eduardo Coutino-Gonzalez
- Centro de Investigaciones en Óptica, A. C. Lomas del Bosque 115, Colonia Lomas del Campestre, León, Guanajuato 37150, Mexico
| | - Mario Ávila-Gutiérrez
- Centro de Investigaciones en Óptica, A. C. Lomas del Bosque 115, Colonia Lomas del Campestre, León, Guanajuato 37150, Mexico
| | - Arnold Hernández-Palomares
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Parque Tecnológico Querétaro, s/n, Pedro Escobedo, Querétaro 76703, Mexico
| | - Lilian I. Olvera
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de Mexico, Apartado Postal 70-360, CU, Coyoacán, Ciudad de México 04510, Mexico
| | - Francisco J. Rodríguez-Valadez
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Parque Tecnológico Querétaro, s/n, Pedro Escobedo, Querétaro 76703, Mexico
| | - Fabricio Espejel-Ayala
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Parque Tecnológico Querétaro, s/n, Pedro Escobedo, Querétaro 76703, Mexico
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