P. Arribas - Academia.edu (original) (raw)

Papers by P. Arribas

Research paper thumbnail of Nanostructured, thin film composite and nanocomposite membranes for water treatment

Nanostructured, thin film composite and nanocomposite membranes for water treatment, Nov 6, 2020

Gracias de corazón a Philipp, por recordarme la pasión por la ciencia y la investigación en mis m... more Gracias de corazón a Philipp, por recordarme la pasión por la ciencia y la investigación en mis momentos más difíciles. Gracias por ayudarme a creer de nuevo en mí. Gracias por tu apoyo incondicional, tu valiosa ayuda, tu cariño, tu generosidad y tu tiempo. Soy de las que piensa que la ciencia debe ser interdisciplinar y que el desarrollo humano y tecnológico hacia un mundo mejor es posible cuando se trabaja en equipo y aportando lo mejor de cada uno al conjunto. ¡Gracias a todos por ayudarme a crecer como persona y a ser quien soy! Esta tesis doctoral ha sido realizada gracias a una beca predoctoral, incluyendo una ayuda para la realización de una estancia predoctoral, concedida por el Campus de Excelencia

Research paper thumbnail of I.amAble: aprendizaje e inclusión educativa mediante talleres científicos

I.amAble ha ofrecido a estudiantes universitarios de fisica, quimica, veterinaria, biologia y edu... more I.amAble ha ofrecido a estudiantes universitarios de fisica, quimica, veterinaria, biologia y educacion la oportunidad de complementar su formacion mediante el diseno, la realizacion y la evaluacion de talleres cientificos que faciliten la inclusion de personas con diversidad cognitiva. Los talleres han sido disenados por el alumnado universitario de ciencias y perfilados por estudiantes de educacion para ser llevados a cabo por alumnado preuniversitario en parejas, de forma que un miembro pertenezca a un centro de secundaria ordinario y el otro miembro a un centro de educacion especial. Aquellos talleres que se han considerado mas adecuados por su adaptabilidad se han llevado a la practica guiados por estudiantes de ciencias y de educacion. Los miembros del proyecto, que incluyen representantes de todos los estamentos universitarios, han supervisado todas las tareas descritas anteriormente. Ademas de los miembros de la Universidad Complutense, tambien figuran personas voluntarias d...

Research paper thumbnail of Improved antifouling performance of polyester thin film nanofiber composite membranes prepared by interfacial polymerization

Journal of Membrane Science, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Heat-treated optimized polysulfone electrospun nanofibrous membranes for high performance wastewater microfiltration

Separation and Purification Technology, 2019

The structure and morphology of self-sustained electrospun nanofibrous membranes (ENMs) are key f... more The structure and morphology of self-sustained electrospun nanofibrous membranes (ENMs) are key factors determining membrane performance for filtration applications. In this study, heat post-treatment (HPT) method was applied to modify the structural and morphological properties of polysulfone (PSU) ENMs, to improve their filtration performance and to obtain membranes suitable for wastewater treatment. The influence of the HPT temperature and time on the morphological structure of the PSU ENMs as well as on fouling and filtration performance was investigated. Microfiltration (MF) tests were conducted using humic acid model solutions with a concentration of 15 mg/L at pH 11. Increasing the HPT temperature or time, led to an increase of the mean nanofiber diameter along with a decrease of the mean size of the inter-fiber space, the void volume fraction and the water contact angle of the membranes. ENMs treated with a higher HPT temperature and a longer time exhibited higher nanofibers interconnectivity and a more compact structure with a smaller size of inter-fiber spaces. Under the same MF operating conditions, a commercial polyethersulfone (PES) MF membrane (HPWP, Millipore) had lower filtration performance (i.e. lower performance index, PI, 82 kg/m 2 h) than the treatedoptimized PSU ENMs (i.e. 147 and 133 kg/m 2 h for ENMs 9 and 10, respectively). The obtained results confirm the good performance of the developed PSU ENMs for MF applications.

Research paper thumbnail of Spinning an Optimized Hollow Fiber Membrane for Desalination by Membrane Distillation using Experimental Statistical Designs

Procedia Engineering, 2012

Research paper thumbnail of Hollow fiber spinning experimental design and analysis of defects for fabrication of optimized membranes for membrane distillation

Desalination, 2012

A fractional factorial design and a steepest ascent method were applied for possible fabrication ... more A fractional factorial design and a steepest ascent method were applied for possible fabrication of hollow fibers by the dry/wet spinning technique. Seven spinning factors were taken into account. Different concentrations of the copolymer poly(vinylidene fluoride-co-hexafluoropropylene), PVDF-HFP with 400,000 g/mol molecular weight and the additive polyethylene glycol, PEG with 10,000 g/mol molecular weight were dissolved in N,N-dimethyl acetamide, DMAC. The developed approach permits localization of the region of experimentation, defect-free spinning conditions, to produce hollow fibers. The obtained hollow fiber membranes were characterized by scanning electron microscopy and atomic force microscopy. Penetration liquid in membrane pores and porosity were also determined. Finally the membranes were tested for desalination by direct contact membrane distillation. An optimal hollow fiber membrane was finally fabricated using the determined optimum spinning conditions: a copolymer concentration of 20% w/w, a PEG concentration of 6% w/w, an air gap length of 25 cm, an internal/external coagulation temperature of 37.5°C, an internal coagulant flow rate of 19 ml/min, a pressure of 0.3 bar and free falling. This membrane exhibits the highest performance index and the greatest global desirability (i.e. high permeate flux and salt rejection factor).

Research paper thumbnail of I.amAble: El aprendizaje en ciencias al servicio de la inclusión educativa

I.amAble es un proyecto que nacio con una filosofia centrada en la utilizacion de acciones de sol... more I.amAble es un proyecto que nacio con una filosofia centrada en la utilizacion de acciones de solidaridad como metodo de aprendizaje. Se disenan y organizan talleres cientificos inclusivos para realizarlos en parejas formadas por personas con discapacidad cognitiva y de educacion secundaria ordinaria. Se pretende aprender a la vez que se da un servicio a la universidad y a la sociedad, y ese es el espiritu que se ha seguido manteniendo durante esta tercera edicion del curso 2018-2019.

Research paper thumbnail of Nanostructured, thin film composite and nanocomposite membranes for water treatment

Nanostructured, thin film composite and nanocomposite membranes for water treatment, Nov 6, 2020

Gracias de corazón a Philipp, por recordarme la pasión por la ciencia y la investigación en mis m... more Gracias de corazón a Philipp, por recordarme la pasión por la ciencia y la investigación en mis momentos más difíciles. Gracias por ayudarme a creer de nuevo en mí. Gracias por tu apoyo incondicional, tu valiosa ayuda, tu cariño, tu generosidad y tu tiempo. Soy de las que piensa que la ciencia debe ser interdisciplinar y que el desarrollo humano y tecnológico hacia un mundo mejor es posible cuando se trabaja en equipo y aportando lo mejor de cada uno al conjunto. ¡Gracias a todos por ayudarme a crecer como persona y a ser quien soy! Esta tesis doctoral ha sido realizada gracias a una beca predoctoral, incluyendo una ayuda para la realización de una estancia predoctoral, concedida por el Campus de Excelencia

Research paper thumbnail of I.amAble: aprendizaje e inclusión educativa mediante talleres científicos

I.amAble ha ofrecido a estudiantes universitarios de fisica, quimica, veterinaria, biologia y edu... more I.amAble ha ofrecido a estudiantes universitarios de fisica, quimica, veterinaria, biologia y educacion la oportunidad de complementar su formacion mediante el diseno, la realizacion y la evaluacion de talleres cientificos que faciliten la inclusion de personas con diversidad cognitiva. Los talleres han sido disenados por el alumnado universitario de ciencias y perfilados por estudiantes de educacion para ser llevados a cabo por alumnado preuniversitario en parejas, de forma que un miembro pertenezca a un centro de secundaria ordinario y el otro miembro a un centro de educacion especial. Aquellos talleres que se han considerado mas adecuados por su adaptabilidad se han llevado a la practica guiados por estudiantes de ciencias y de educacion. Los miembros del proyecto, que incluyen representantes de todos los estamentos universitarios, han supervisado todas las tareas descritas anteriormente. Ademas de los miembros de la Universidad Complutense, tambien figuran personas voluntarias d...

Research paper thumbnail of Improved antifouling performance of polyester thin film nanofiber composite membranes prepared by interfacial polymerization

Journal of Membrane Science, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Heat-treated optimized polysulfone electrospun nanofibrous membranes for high performance wastewater microfiltration

Separation and Purification Technology, 2019

The structure and morphology of self-sustained electrospun nanofibrous membranes (ENMs) are key f... more The structure and morphology of self-sustained electrospun nanofibrous membranes (ENMs) are key factors determining membrane performance for filtration applications. In this study, heat post-treatment (HPT) method was applied to modify the structural and morphological properties of polysulfone (PSU) ENMs, to improve their filtration performance and to obtain membranes suitable for wastewater treatment. The influence of the HPT temperature and time on the morphological structure of the PSU ENMs as well as on fouling and filtration performance was investigated. Microfiltration (MF) tests were conducted using humic acid model solutions with a concentration of 15 mg/L at pH 11. Increasing the HPT temperature or time, led to an increase of the mean nanofiber diameter along with a decrease of the mean size of the inter-fiber space, the void volume fraction and the water contact angle of the membranes. ENMs treated with a higher HPT temperature and a longer time exhibited higher nanofibers interconnectivity and a more compact structure with a smaller size of inter-fiber spaces. Under the same MF operating conditions, a commercial polyethersulfone (PES) MF membrane (HPWP, Millipore) had lower filtration performance (i.e. lower performance index, PI, 82 kg/m 2 h) than the treatedoptimized PSU ENMs (i.e. 147 and 133 kg/m 2 h for ENMs 9 and 10, respectively). The obtained results confirm the good performance of the developed PSU ENMs for MF applications.

Research paper thumbnail of Spinning an Optimized Hollow Fiber Membrane for Desalination by Membrane Distillation using Experimental Statistical Designs

Procedia Engineering, 2012

Research paper thumbnail of Hollow fiber spinning experimental design and analysis of defects for fabrication of optimized membranes for membrane distillation

Desalination, 2012

A fractional factorial design and a steepest ascent method were applied for possible fabrication ... more A fractional factorial design and a steepest ascent method were applied for possible fabrication of hollow fibers by the dry/wet spinning technique. Seven spinning factors were taken into account. Different concentrations of the copolymer poly(vinylidene fluoride-co-hexafluoropropylene), PVDF-HFP with 400,000 g/mol molecular weight and the additive polyethylene glycol, PEG with 10,000 g/mol molecular weight were dissolved in N,N-dimethyl acetamide, DMAC. The developed approach permits localization of the region of experimentation, defect-free spinning conditions, to produce hollow fibers. The obtained hollow fiber membranes were characterized by scanning electron microscopy and atomic force microscopy. Penetration liquid in membrane pores and porosity were also determined. Finally the membranes were tested for desalination by direct contact membrane distillation. An optimal hollow fiber membrane was finally fabricated using the determined optimum spinning conditions: a copolymer concentration of 20% w/w, a PEG concentration of 6% w/w, an air gap length of 25 cm, an internal/external coagulation temperature of 37.5°C, an internal coagulant flow rate of 19 ml/min, a pressure of 0.3 bar and free falling. This membrane exhibits the highest performance index and the greatest global desirability (i.e. high permeate flux and salt rejection factor).

Research paper thumbnail of I.amAble: El aprendizaje en ciencias al servicio de la inclusión educativa

I.amAble es un proyecto que nacio con una filosofia centrada en la utilizacion de acciones de sol... more I.amAble es un proyecto que nacio con una filosofia centrada en la utilizacion de acciones de solidaridad como metodo de aprendizaje. Se disenan y organizan talleres cientificos inclusivos para realizarlos en parejas formadas por personas con discapacidad cognitiva y de educacion secundaria ordinaria. Se pretende aprender a la vez que se da un servicio a la universidad y a la sociedad, y ese es el espiritu que se ha seguido manteniendo durante esta tercera edicion del curso 2018-2019.