Gas permeability, diffusivity and solubility of nitrogen, helium, methane, carbon dioxide and formaldehyde in dense polymeric membranes using a new on-line permeation apparatus

Tremblay, Patrice; Savard, Martine M.; Vermette, Jonathan; Paquin, Réal

doi:10.1016/j.memsci.2006.05.030

Cited by 85 publications

(58 citation statements)

References 56 publications

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“…13,15,16 Such devices are generally made from poly-(dimethylsiloxane) (PDMS) or glass, with PDMS being advantageous as it is permeable to gases such as O 2 and CO 2 . 17 Using microfluidic devices, the chemical environment of the cell culture can be manipulated in ways not possible with conventional microwells. 12 Furthermore, high throughput screening of microdroplets at frequencies in excess of 1 kHz is possible using such systems.…”

Section: Insight Innovation Integrationmentioning

confidence: 99%

Quantitative tracking of the growth of individual algal cells in microdroplet compartments

et al. 2011

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In this paper we introduce a simple droplet-based microfluidic system consisting of two separate devices to encapsulate and culture microalgae, in contrast to cultivation in bulk liquid medium. This microdroplet technology has been used to monitor the growth of individual microalgal cells in a constant environment for extended periods of time. Single cells from three species of green microalgae, (two freshwater species Chlamydomonas reinhardtii and Chlorella vulgaris, and one saline species Dunaliella tertiolecta), were encapsulated and incubated in microdroplet compartments of diameter of B80 mm, and their growth analysed over 10 days. In all cases, the doubling time of microalgae grown in microdroplets was similar to growth in bulk. The growth of C. reinhardtii in microdroplets of varying diameters and with different initial cell numbers per droplet was investigated, as well as the effect of varying medium conditions such as pH and nitrogen concentration. This methodology offers the opportunity to study characteristics over time of individual cells and colonies, as well as to screen large numbers of them.

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Section: Insight Innovation Integrationmentioning

confidence: 99%

Quantitative tracking of the growth of individual algal cells in microdroplet compartments

et al. 2011

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“…68 Stronger interactions between a gas and the functional groups of a polymer result in higher solubility of that gas in the polymer. 69 Therefore, C02, which has a quadrupolar moment, is highly soluble in polar polymers. polymers show a high permeability, but a low selectivity, whereas glassy polymers exhibit a low permeability but a high selectivity.…”

Section: Polymeric Membranesmentioning

confidence: 99%

Molecular engineering design of the SAPO-34 and ZIF-8 membranes for CO2 separation from CH4 and N2.

Venna¹

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“…Pequenas quantidades de micro-ou nanocarga, são suficientes para agregar ao polímero uma melhora expressiva em suas propriedades, reduzindo o custo e o peso dos artigos acabados em comparação aos compósitos convencionais [10] . Membranas poliméricas densas têm sido extensivamente estudadas para o emprego em separação de gases, incluindo: o enriquecimento de nitrogênio e de oxigênio; a recuperação de hidrogênio; a remoção de gases ácidos (CO 2 , H 2 S) do gás natural e de voláteis orgânicos; a desidratação de ar e do gás natural, além de outras aplicações, nas áreas química, têxtil, biomédica, petroquímica, farmacêutica e alimentícia [11][12][13][14][15][16][17][18][19][20] . Os poliuretanos (PU) são materiais que têm sido investigados na utilização em membranas densas permeáveis a gases devido à possibilidade de adequação de suas propriedades de transporte através da variação da microestrutura do polímero [15,[21][22][23][24][25][26] .…”

Section: -Avaliação Das Propriedades De Barreira De Membranas Obtidasunclassified

Avaliação das Propriedades de Barreira de Membranas Obtidas a partir de Dispersões Aquosas à Base de Poliuretanos e Argila

Barboza¹,

Delpech²,

Garcia³

et al. 2014

Polímeros

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Resumo: Formulações de aplicação não-poluente à base de poliuretanos em dispersão aquosa (WPUs), com adição de argila montmorilonita hidrofílica (CWPUs), foram sintetizadas. A permeabilidade ao dióxido de carbono (CO 2 ) de membranas densas obtidas a partir do espalhamento das dispersões foi avaliada. Os reagentes empregados na síntese dos materiais foram: poli(glicol proplilênico) (PPG), copolímero em bloco à base de segmentos de poli(glicol etilênico) e poli(glicol propilênico) (EG-b-PG), ácido dimetilolpropiônico (DMPA), diisocianato de isoforona (IPDI) e etilenodiamina (EDA), como extensor de cadeia, levando à formação de ligações de ureia. Diferentes formulações foram obtidas variando-se a proporção de segmentos à base de poli(glicol etilênico) (PEG) e o teor de argila (0,5 e 1 %). As dispersões foram avaliadas em termos de teor de sólidos e viscosidade aparente. As membranas foram caracterizadas por espectrometria na região do infravermelho (FTIR) e permeabilidade ao dióxido de carbono (CO 2 ). A influência nas propriedades de barreira, conferida pela presença da argila e do copolímero em bloco, foi verificada por ensaios de permeabilidade. A permeabilidade ao CO 2 aumentou com o aumento no teor segmentos de PEG e diminuiu com a inserção da argila, uma vez que esta é impermeável a gases, formando caminhos preferenciais na matriz polimérica que retardam a difusão das moléculas de gás. Palavras-chave: Poliuretanos, dispersões aquosas, argila, montmorilonita, membranas, permeabilidade a gases, propriedades de barreira. Evaluation of Carbon Dioxide Gas Barrier Properties of Membranes Obtained from Aqueous Dispersions Based on Polyurethane and ClayAbstract: Non-polluting aqueous polyurethane-based dispersions were synthesized in the presence and absence of montmorillonite hydrophilic clay (WPUs and CWPUs, respectively). The permeability of carbon dioxide (CO 2 ) through dense membranes obtained from the dispersions was evaluated. The reagents used in the synthesis of the materials were: poly(propylene glycol) (PPG), block copolymer of poly(ethylene glycol) and poly(propylene glycol) (EG-b-PG), dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI) and ethylene diamine (EDA) as chain extender, leading to the formation of urea linkages. The proportion of poly(ethylene glycol) (PEG) segments and clay content (0.5 and 1%) was varied in the formulations. The dispersions were evaluated in terms of solids content and apparent viscosity. The membranes were characterized by infrared spectrometry (FTIR) and permeability to carbon dioxide (CO 2 ). The influence on the gas barrier properties, imparted by different contents of PEG segments in polyurethane chains, and by the clay in the formulations was verified. The permeability of CO 2 increased with increasing amounts of PEG segments and decreased with the insertion of clay, since the latter is impermeable to gas and forms, in the polymeric matrix, tortuous pathways that retard gas diffusion.

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Gas permeability, diffusivity and solubility of nitrogen, helium, methane, carbon dioxide and formaldehyde in dense polymeric membranes using a new on-line permeation apparatus

Cited by 85 publications

References 56 publications

Quantitative tracking of the growth of individual algal cells in microdroplet compartments

Quantitative tracking of the growth of individual algal cells in microdroplet compartments

Molecular engineering design of the SAPO-34 and ZIF-8 membranes for CO2 separation from CH4 and N2.

Avaliação das Propriedades de Barreira de Membranas Obtidas a partir de Dispersões Aquosas à Base de Poliuretanos e Argila

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