dor_id: 4108508

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351.#.#.a: Artículos

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100.1.#.a: Galindo, S.; Urena Nuñez, F.

524.#.#.a: Galindo, S., et al. (2018). Enhanced surface hydrophobicity of poly(lactic acid) by Co60 gamma ray irradiation. Revista Mexicana de Física; Vol 64, No 1 Jan-Feb: 1-7. Recuperado de https://repositorio.unam.mx/contenidos/4108508

245.1.0.a: Enhanced surface hydrophobicity of poly(lactic acid) by Co60 gamma ray irradiation

502.#.#.c: Universidad Nacional Autónoma de México

561.1.#.a: Facultad de Ciencias, UNAM

264.#.0.c: 2018

264.#.1.c: 2018-01-30

653.#.#.a: Poly(lactic acid); wettability; gamma-irradiation; surface morphology; Cassie-Baxter; Wenzel

506.1.#.a: La titularidad de los derechos patrimoniales de esta obra pertenece a las instituciones editoras. Su uso se rige por una licencia Creative Commons BY-NC-ND 4.0 Internacional, https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es, fecha de asignación de la licencia 2018-01-30, para un uso diferente consultar al responsable jurídico del repositorio por medio de rmf@ciencias.unam.mx

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001.#.#.#: oai:ojs.rmf.smf.mx:article/15

041.#.7.h: eng

520.3.#.a: Contact angle measurements were performed on Co60γ-ray irradiated poly(lactic acid) (PLA) samples at several doses, using the sessile drop method. It was found that irradiation alters the wettability of PLA. In particular, PLA wetting behavior changes from moderately hydrophilic at low dose (< 100 kGy), to hydrophobic after the samples were exposed above a threshold dose (\approx 200 kGy). At low doses, wettability follows the Wenzel relation but beyond a threshold dose the Cassie-Baxter regime takes place. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) show that surface roughness of the samples increases as the applied dose increases. PLA wettability changes are mainly a consequence of surface modifications as roughness promotes the formation of air pockets under a drop, which reinforces the hydrophobic nature of is surface. Co60γ ray irradiation can be used to tailor wetting properties of PLA. The method might have also application to produce biphilic PLA. Finally it is very important to remark that reported contact angles values for PLA (by different authors) of untreated samples vary from 60 to 85 degrees. Reasons for this behavior are given in this article.

773.1.#.t: Revista Mexicana de Física; Vol 64, No 1 Jan-Feb (2018): 1-7

773.1.#.o: https://rmf.smf.mx/ojs/rmf/index

046.#.#.j: 2020-11-25 00:00:00.000000

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doi: https://doi.org/10.31349/RevMexFis.64.1

handle: 00a6dd87ef1f45e4

harvesting_date: 2020-09-23 00:00:00.0

856.#.0.q: application/pdf

last_modified: 2020-11-27 00:00:00

license_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es

license_type: by-nc-nd

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Artículo

Enhanced surface hydrophobicity of poly(lactic acid) by Co60 gamma ray irradiation

Galindo, S.; Urena Nuñez, F.

Facultad de Ciencias, UNAM, publicado en Revista Mexicana de Física, y cosechado de Revistas UNAM

Licencia de uso

Procedencia del contenido

Entidad o dependencia
Facultad de Ciencias, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

Cita

Galindo, S., et al. (2018). Enhanced surface hydrophobicity of poly(lactic acid) by Co60 gamma ray irradiation. Revista Mexicana de Física; Vol 64, No 1 Jan-Feb: 1-7. Recuperado de https://repositorio.unam.mx/contenidos/4108508

Descripción del recurso

Autor(es)
Galindo, S.; Urena Nuñez, F.
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Enhanced surface hydrophobicity of poly(lactic acid) by Co60 gamma ray irradiation
Fecha
2018-01-30
Resumen
Contact angle measurements were performed on Co60γ-ray irradiated poly(lactic acid) (PLA) samples at several doses, using the sessile drop method. It was found that irradiation alters the wettability of PLA. In particular, PLA wetting behavior changes from moderately hydrophilic at low dose (< 100 kGy), to hydrophobic after the samples were exposed above a threshold dose (\approx 200 kGy). At low doses, wettability follows the Wenzel relation but beyond a threshold dose the Cassie-Baxter regime takes place. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) show that surface roughness of the samples increases as the applied dose increases. PLA wettability changes are mainly a consequence of surface modifications as roughness promotes the formation of air pockets under a drop, which reinforces the hydrophobic nature of is surface. Co60γ ray irradiation can be used to tailor wetting properties of PLA. The method might have also application to produce biphilic PLA. Finally it is very important to remark that reported contact angles values for PLA (by different authors) of untreated samples vary from 60 to 85 degrees. Reasons for this behavior are given in this article.
Tema
Poly(lactic acid); wettability; gamma-irradiation; surface morphology; Cassie-Baxter; Wenzel
Idioma
eng
ISSN
2683-2224 (digital); 0035-001X (impresa)

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