Why only solubility parameters? Liquid-phase exfoliation from the point of view of colloidal chemistry

Autor(es)

Damasceno, Joao Paulo Vita ; Caironi, Mario ; Kubota, Lauro Tatsuo

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS TODAY CHEMISTRY; v. 38, p. 8-pg., 2024-04-12.

Resumo

Liquid-phase exfoliation has been widely used to obtain 2D nanomaterials from layered or non-layered solids. Most reports have focused on exfoliation procedures using aqueous solutions of passivating agents, functionalized materials in water, or pristine materials in 'good' organic solvents. Herein, we highlight the third method applied to carbon nanomaterials because it results in stable and concentrated systems without any other additives, and the deposited materials form conductive patterns after solvent drying without the need for posttreatments like (electro)chemical reduction or removal of passivating agents. Good solvents for exfoliating pristine materials have been ascribed as having the 'correct' match of Hansen solubility parameters. Although this approach successfully enhances the yield in terms of mass concentration, it does not explain the high stability of dispersions prepared in liquids ascribed as 'bad' solvents or some properties observed for exfoliated materials in both 'good' and 'bad' ones, like sedimentation. In this review, we have reinterpreted organic dispersions of pristine carbon materials using concepts of Colloidal Chemistry, which can explain many poorly understood properties and guide new improvements in this area. (AU)

• Processo FAPESP: 22/05053-4 - Preparação de tintas condutoras baseadas em materiais de carbono para dispositivos eletrônicos impressos
• Beneficiário: João Paulo Vita Damasceno
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/22127-2 - Desenvolvimento de novos materiais estratégicos para dispositivos analíticos integrados
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 20/06604-9 - Tintas condutoras à base de nanomateriais carbonáceos para preparação de eletrodos aplicados em dispositivos eletroquímicos
• Beneficiário: João Paulo Vita Damasceno
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado