Cold sintering of diatomaceous earth

Galotta, Anna; Giust, Enrico; Bortolotti, Mauro; Sorarù, Gian Domenico; Biesuz, Mattia

doi:10.1111/jace.17863

Cited by 31 publications

(11 citation statements)

References 63 publications

(128 reference statements)

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“…During the CSP, when suitable liquid aids are selected to dissolve the edges of the particles, the pores between the particles can be eliminated by the evaporation of the solvent and precipitation of the solute [17,18]. So far, many oxide materials including ZrO 2 [19], MgO [20], Bi 2 O 3 [21], CaCO 3 [22], and SiO 2 [23][24][25][26][27], have been successfully prepared by the CSP. However, very few studies related to the CSP-densified glass materials have been demonstrated [28].…”

mentioning

confidence: 99%

Realizing translucency in aluminosilicate glass at ultralow temperature via cold sintering process

Gao

Wang²,

Luo³

et al. 2022

J Adv Ceram

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Glass with high visible-light transparency is widely considered as the most important optical material, which typically requires a processing temperature higher than 1000 °C. Here, we report a translucent aluminosilicate glass that can be prepared by cold sintering process (CSP) at merely 300 °C. After eliminating structural pores in hexagonal faujasite (EMT)-type zeolite by heat treatment, the obtained highly active nanoparticles are consolidated to have nearly full density by adding NaOH solution as liquid aids. However, direct densification of EMT powder cannot remove the structural pores of zeolite completely, leading to an opaque compact after the CSP. It is proved that the chemical reaction between the NaOH- and zeolite-derived powders is highly beneficial to dissolution-precipitation process during sintering, leading to the ultra-low activation energy of 27.13 kJ/mol. Although the addition of 5 M NaOH solution greatly promotes the densification via the reaction with aluminosilicate powder, lower or higher concentration of solvent can deteriorate the transmittance of glass. Additionally, the CSP-prepared glass exhibits a Vickers hardness of 4.3 GPa, reaching 60% of the reported value for spark plasma sintering (SPS)-prepared sample.

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mentioning

confidence: 99%

Realizing translucency in aluminosilicate glass at ultralow temperature via cold sintering process

Gao

Wang²,

Luo³

et al. 2022

J Adv Ceram

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“…The process shares an analogy to a combination of hot pressing and liquid-assisted sintering. [144] During the cold sintering process, a capillary force is formed under the applied uniaxial pressure, and the ratio between the concentration of the transient liquid and the corresponding pressure affects the particle rearrangement, dissolution, and precipitation and hence, the possible grain growth and densification. [147] The detailed cold sintering process can be understood in two stages.…”

Section: Cold Sinteringmentioning

confidence: 99%

Toward Ecofriendly Piezoelectric Ceramics—Reduction of Energy and Environmental Footprint from Conceptualization to Deployment

Anandakrishnan,

Yadav,

Tabeshfar

et al. 2023

Global Challenges

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Piezoelectric materials are widely used in electromechanical coupling components including actuators, kinetic sensors, and transducers, as well as in kinetic energy harvesters that convert mechanical energy into electricity and thus can power wireless sensing networks and the Internet of Things (IoT). Because the number of deployed energy harvesting powered systems is projected to explode, the supply of piezoelectric energy harvesters is also expected to be boosted. However, despite being able to produce green electricity from the ambient environment, high‐performance piezoelectrics (i.e., piezoelectric ceramics) are energy intensive in research and manufacturing. For instance, the design of new piezoceramics relies on experimental trials, which need high process temperatures and thus cause high consumption and waste of energy. Also, the dominant element in high‐performance piezoceramics is hazardous Pb, but substituting Pb with other nonhazardous elements may lead to a compromise of performance, extending the energy payback time and imposing a question of trade‐offs between energy and environmental benefits. Meanwhile, piezoceramics are not well recycled, raising even more issues in terms of energy saving and environmental protection. This paper discusses these issues and then proposes solutions and provides perspectives to the future development of different aspects of piezoceramic research and industry.

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“…Os componentes adicionados têm o papel de garantir que no segundo estágio do processo a composição formada do material depositado devido a evaporação da fase líquida seja similar a composição da matriz cerâmica já consolidada (WANG, 2020). De acordo com Galotta et al (2021), os primeiros materiais feitos por CSP foram principalmente sais e compostos solúveis, mas também foram produzidos materiais ferroelétricos, piezoelétricos, cerâmica magnética, semicondutores, biocerâmicas e condutores iônicos (GALOTTA, 2021). Assim verifica-se um grande rol de cerâmicas que podem ser produzidas pela técnica de CSP, abrangendo um amplo campo de atuação para materiais cerâmicos.…”

Section: Características Dos Processos De Sinterização a Friounclassified

“…O volume de poros e área superficial são parâmetros importantes na compreensão da morfologia interna das cerâmicas e poderão ser avaliados pelos métodos de Adsorção/Dessorção de Nitrogênio e Brunauer-Emmett-Teller (BET). Outras técnicas de espectroscopia poderão ser usadas em casos específicos (GALOTTA, 2021;GIRALDI, 2012;HASHMI, 2016;INDUJA, 2017;NDAYISHIMIYE, 2020;ZAHABI, 2021). Ensaios de caracterização mecânica, térmica e elétrica são também realizados de acordo com as características dos produtos de cada trabalho.…”

Section: Caracterização Dos Produtosunclassified

Engenharia de materiais: materializando o futuro

Lara¹

2022

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Esta obra é licenciada por uma Licença Creative Commons: Atribuição-NãoComercial-SemDerivações 4.0 Internacional -(CC BY-NC-ND 4.0). Os termos desta licença estão disponíveis em: . Direitos para esta edição cedidos à Pimenta Cultural. O conteúdo publicado não representa a posição oficial da Pimenta Cultural.Figura 3 -(a) Macromorfologia e (b) distribuição de tamanho dos poros no scaffold. Fonte: adaptado com permissão de Zhou et al. (2015).

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Cold sintering of diatomaceous earth

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 31 publications

References 63 publications

Realizing translucency in aluminosilicate glass at ultralow temperature via cold sintering process

Realizing translucency in aluminosilicate glass at ultralow temperature via cold sintering process

Toward Ecofriendly Piezoelectric Ceramics—Reduction of Energy and Environmental Footprint from Conceptualization to Deployment

Engenharia de materiais: materializando o futuro

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