Wetting dynamics and contact angles of powders studied through capillary rise experiments

Depalo, Andrea; Santomaso, Andrea C.

doi:10.1016/j.colsurfa.2013.06.040

Cited by 49 publications

(25 citation statements)

References 15 publications

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“…11 apresenta a relação entre o ângulo de contato em água e a porosidade do sistema para f) 11 que os valores calculados de ângulo de contato em água para a série de combinações com o Procarb 5 e a medida de Profine 1 apresentaram molhagem espontânea do pó (<90º). Exceto a combinação 1 da série, os demais valores situaram-se dentro da faixa encontrada na literatura de 30<θ<80º [13,20,34]. No entanto, considerando todos os valores, desse estudo e da literatura, observa-se ampla variação desses valores para o que nominalmente é o mesmo material, carbonato de cálcio.…”

Section: Resultsunclassified

“…11), diâmetros médios variando de 5 a 130 μm, não exibiram significativa relação entre ângulo de contato (59,7 a 77,1º) e porosidade (44 a 56%). Depalo e Santomaso [34] investigaram uma configuração experimental baseada no método modificado de Washburn, no qual acompanha-se o incremento de pressão. Dentre os materiais estão dois carbonatos de cálcio (quadrados na Fig.…”

Section: Resultsunclassified

“…-For each combination of sample packing method for Procarb 5: mean geometric constant C, mean water penetration rate, standard deviation (σ), cosine, contact angle and porosity.] Figura 11: Ângulo de contato em água vs. porosidade de carbonatos de cálcio: série de combinações de preparo do Procarb 5, presente estudo (losangos abertos), destaque para a combinação 5 (losango fechado), Profine 1 na combinação 5 (triângulo), Galet et al[13] (círculos), Depalo e Santomaso[34] (quadrados).…”

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“…carbonatos de cálcio da série de combinações de preparação de amostras de Procarb 5 (Procarb 5 -série), para o carbonato de cálcio Profine 1 preparado segundo a combinação 5 e dados de autores que, do mesmo modo, analisaram carbonatos de cálcio pelo método de Washburn[13,34]. As linhas tracejadas correspondem aos valores de porosidades nominais do Procarb 5 e Profine 1, respectivamente, 11,8% e 15,6%.…”

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Aplicabilidade do método modificado de Washburn para medidas de ângulo de contato de carbonato de cálcio

Valencia

Pileggi

2018

Cerâmica

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Resumo Dispersões cerâmicas apresentam propriedades físicas e químicas fortemente influenciadas por forças superficiais entre partículas e o líquido. Como estratégia para diminuir impactos ambientais, dispersões cerâmicas estão tornando-se mais concentradas, resultando em sistemas mais complexos e mais susceptíveis às forças superficiais. Caracterizar a molhabilidade das partículas pelo líquido é uma forma de determinar o efeito dessas forças. Molhabilidade representa a grandeza de um líquido se espalhar sobre um sólido, descrita pelo ângulo de contato. Para pós, é recomendado o método modificado de Washburn, baseado na ascensão capilar do líquido em um tubo contendo o pó. Nesse trabalho objetivou-se medir valores de ângulo de contato de carbonato de cálcio em duas granulometrias com o propósito de avaliar a aplicabilidade do método modificado de Washburn para medidas de ângulo de contato de pós cerâmicos. As medidas de ângulo de contato utilizando aparato simplificado mostraram-se adequadas e sensíveis à granulometria, preparação da amostra e porosidade do sistema. Quanto menor a porosidade do sistema, menores foram os ângulos de contato calculados. Contudo, a variação dos valores calculados e da literatura sugere que os ângulos de contato calculados pelo método modificado de Washburn sejam comparativos, desde que se respeite a mesma configuração e preparação de amostra.

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Aplicabilidade do método modificado de Washburn para medidas de ângulo de contato de carbonato de cálcio

Valencia

Pileggi

2018

Cerâmica

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“…It is evident that, a higher inlet temperature and lower vacuum pressure attribute to large particle formation. Hence, it increases particle size and lower the clumping incidence, by allowing particles or agglomerates to interact with water, and thus lowers the wetting angle and increases wettability (Depalo & Santomaso, ; Seth, Mishra, & Deka, ; Fitzpatrick et al, ; Nishad, Selvan, Ahmad Mir, & Don Bosco, ). An increase in the MD concentration is accompanied by an increase in wetting angle.…”

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Experimental optimization of chicory root (Cichorium intybus L.) aqueous extracts formulation by novel approach of ongoing ultrasonic vacuum spray drying using response surface methodology

Namavar

Chayjan

Parian

et al. 2018

J Food Process Engineering

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In the present study, we performed a simultaneous optimization of various inlet temperatures, vacuum pressures, and maltodextrin concentrations to produce chicory root inulin extract powder by the novel approach of ongoing ultrasonic vacuum spray drying. To obtain the optimum conditions, we used a central composite face‐centered design of response surface methodology (RSM). Performing this drying approach in a vacuumed drying chamber required lower temperatures compared to the conventional dryers. We used 4–6% (wt/vol) maltodextrin concentrations at inlet temperatures of 50, 65, and 80 °C and vacuum pressures of 20, 35, and 50 kPa and evaluated the following responses: total phenolic content (TPC), total flavonoids concentration (TFC), DPPH radical scavenging capacity, moisture content, bulk density, wettability, and solubility. We found that the highest desirability (0.646) was achieved at an inlet temperature, vacuum pressure, and maltodextrin concentration of 50 °C, 20 kPa, and 4.7%, respectively. Practical applications In this research, we developed an ultrasonic vacuum spray dryer (UVSD) that performs spray drying in a vacuum chamber at lower temperatures than the conventional spray drying. This procedure can be considered as a novel technique to produce powder from the Chicory Root (Cichorium intybus L.) Aqueous Extract. Minimization of the oxidative and thermal stresses during the drying is the main advantage of this process. Drying conditions were optimized by using a central composite face‐centered design of response surface methodology (RSM) to improve the chemical and physical properties of the produced powder. Nutritional and pharmaceutical properties of the chicory root are associated with their special chemical composition such as high levels of polyphenolic compounds. Drying temperature was reduced via controlling the vacuum condition in the drying chamber of the UVSD such that to continuously obtain a powder rich in heat‐sensitive ingredients.

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Superhydrophobic Nanoparticles: An Efficiently Selective Adsorbent for Surfactant‐Like Contaminants from Complex Wastewater Matrices

Zhang,

Tang,

Tang

et al. 2023

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Surfactant‐like contaminants (SLCs) with distinctive amphiphilic structures have become a global concern in wastewater due to their toxicity and persistency. Despite extensive efforts, achieving efficient and selective SLCs removal remains challenging because of their wide range of molecular weights and complex functional group compositions. Superhydrophobic nanoparticles can potentially tackle this challenge by targeting the long oleophilic chains of SLCs. However, conventional contact angle measurements hinder hydrophobicity characterization and corresponding selectivity research because of the powder morphology of nanoparticles. Herein, the authors offered information regarding the distribution of water molecular probes in surfaces and proposed a quantitative characterization approach based on low‐field nuclear magnetic resonance. Through synthesizing superhydrophobic and hydrophilic polydopamine nanospheres with similar morphologies, the selective adsorption potential of superhydrophobic nanoparticles for SLCs is systematically demonstrated. As revealed by the interaction mechanisms, the superhydrophobic surface of nanospheres increased its affinity and selectivity for SLCs adsorption by enhancing hydrophobic interactions. Superhydrophobic modification achieved ten times the adsorption capacity of sodium dodecyl benzene sulfonate, an exemplified surfactant, compared with pristine nanoparticles. By regulated self‐polymerization, the superhydrophobic nanospheres are coated onto the surface of a 3D sponge and enable efficient selective SLCs adsorption from highly polluted leachate matrices with long‐term stability and reusability.

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Wetting dynamics and contact angles of powders studied through capillary rise experiments

Cited by 49 publications

References 15 publications

Aplicabilidade do método modificado de Washburn para medidas de ângulo de contato de carbonato de cálcio

Aplicabilidade do método modificado de Washburn para medidas de ângulo de contato de carbonato de cálcio

Experimental optimization of chicory root (Cichorium intybus L.) aqueous extracts formulation by novel approach of ongoing ultrasonic vacuum spray drying using response surface methodology

Superhydrophobic Nanoparticles: An Efficiently Selective Adsorbent for Surfactant‐Like Contaminants from Complex Wastewater Matrices

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