Vertically aligned carbon nanotubes (VACNT) surfaces coated with polyethylene for enhanced dew harvesting

Autor(es)

Pinheiro, Romario Araujo ^[1] ; Rosa, Filipe Menezes ^{[1, 2]} ; Volu, Rene Martins ^{[1, 3]} ; de Vasconcelos, Getulio ^[3] ; Trava-Airoldi, Vladimir Jesus ^{[1, 2]} ; Corat, Evaldo Jose ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais LABAS INPE, Lab Associado Sensores & Mat, Sao Jose Dos Campos, SP - Brazil

^[2] de Vasconcelos, Getulio, Inst Estudos Avancados, Dept Ciencia \& Tecnol Aerosp IEAv DCTA, Sao Jose Dos Campos, SP, Brazil.Pinheiro, Romario Araujo, Inst Nacl Pesquisas Espaciais LABAS INPE, Lab Associado Sensores & Mat, Sao Jose Dos Campos, SP - Brazil

^[3] Inst Estudos Avancados, Dept Ciencia & Tecnol Aerosp IEAv DCTA, Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: DIAMOND AND RELATED MATERIALS; v. 107, AUG 2020.
• Citações Web of Science: 0

Resumo

In this work we prepared vertically aligned carbon nanotubes (VACNT) based super-hydrophobic surfaces with enhanced dew condensation. Coating these VACNT with a nanometric polyethylene (PE) layer preserved morphology, but normalized surface energy increasing its super-hydrophobicity. Samples of as grown VACNT with the PE coating (VACNT-PE samples) and VACNT samples treated by CO2 laser and with PE coating (VACNT/laser-PE samples) show a much higher condensation for low surface temperatures (T-s < 288 K). M this low temperature, it changes from a low adhesion Cassie Baxter wetting state to a more adhesive one. Despite this larger adhesion, water collection enlarges instead of decreasing. Hierarchical condensation is the most likely effect contributing for this further increase. The cage-like morphology left by laser tracks on VACNT/laser-PE sustain larger droplets that removes all water underneath and neighbor regions while moving. In these conditions the volume collection is over 30 times larger than at dew point, with a high volumetric efficiency. (AU)

• Processo FAPESP: 12/15857-1 - Estudos científicos e aplicações inovadoras em diamante-CVD, Diamond-Like Carbon (DLC) e carbono nanoestruturado, obtidos por deposição química na fase vapor
• Beneficiário: Vladimir Jesus Trava-Airoldi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/07912-3 - Desenvolvimento de sistema microfluídico à base de nanocompósito diamante/nanotubos de carbono para coleta de água da atmosfera
• Beneficiário: Romário Araújo Pinheiro
• Modalidade de apoio: Bolsas no Brasil - Doutorado