2020 Photography contest winner

Honeycomb-like microstructured materials for mechanically strong polymer films. Author: Ms. Nerea Jiménez

TEM micrograph of a cross-section of an acrylic polymer film for coatings applications. In the image, the darkest component forms a honeycomb microstructure around the lightest phase. The dark phase was composed of tannic acid, a naturally occurring polyphenol, and the light phase was consisting of poly(N-vinyl pyrrolidone-co-butyl acrylate-co-methyl methacrylate) (P(NVP/BA/MMA) polymer particles produced by seeded semibatch emulsion polymerization. For the preparation of the sample, 5% based on polymer of tannic acid was added as an aqueous solution to the P(NVP/BA/MMA) polymer dispersion. The blend was stirred for 30 minutes, cast into a silicone mould and dried for 7 days at 55 % relative humidity and 25 ºC. The resulting polymer film was cut employing a microtome and stained with ruthenium tetraoxide (RuO4) in order to increase the contrast of the aromatic rings of tannic acid. The staining process allowed the observation of the honeycomb microstructure formed by tannic acid around the polymer particles. The honeycomb microstructure was formed as a result of the strong hydrogen bonds between the aromatic hydroxyl groups of tannic acid and the amide groups of the pyrrolidones present in the polymer, which promoted the homogeneous distribution of tannic acid around the polymer particles. This conclusion was made by comparing the microstructure of the materials prepared without the pyrrolidone: The tannic acid formed aggregates instead of the continuous honeycomb microstructure. The P(NVP/BA/MMA)/tannic acid hydrogen bonded materials presented greater Young’s modulus and yield stress as a result of the hard honeycomb structure. The high stiffness presented by these materials make them excellent candidates for applications that require hard polymer films and opens the way for the complete replacement of solventborne coatings.

CONCURSO DE FOTOGRAFIA CIENTIFICA 2020


¿Quién puede participar?

• Estudiantes de doctorado afiliados a POLYMAT.
• No podrán participar estudiantes que hayan sido ganadores de alguna edición anterior.
• Plazo de entrega: 31 de Enero de 2020.
• Enviar los documentos por mail a: polymat@ehu.eus


Información a enviar


Utilizar el documento Word (Template) modelo que debe incluir:
• Un máximo de 2 fotos detallando el tipo de técnica utilizada (SEM, TEM...) y la escala, así como una descripción de la preparación de la muestra.
• Resumen del proyecto de tesis (200 palabras).
• Título y Descripción de la foto en el contexto de la Tesis o del proyecto en el que se realiza la investigación y descripción detallada de la preparación de la muestra para la obtención de la foto.
• Director(es) de tesis.
• Versión en papel de todo el documento.


Evaluación

  • Relación con la tesis o proyecto e interpretación de la imagen y descripción detallada de la preparación de la muestra para obtener la foto (25%)
  • Estética de la imagen (25%)
  • Calidad de la imagen (25%)
  • Dificultad en la obtención de la foto (25%)

Los dos primeros criterios serán evaluados por el consejo del instituto POLYMAT y el tercero y cuarto serán evaluados por la Dra. Dolores Martin y la Dra. Ana Martínez de los servicios generales (SGIker) de AFM y TEM de la Universidad.


Premio


• Inscripción en un congreso internacional seleccionado de acuerdo con el director(es) de tesis y gastos de viaje y alojamiento hasta un máx. de 1.500 Euros.

2019 Photography contest winner

Tittle:
Description: AFM phase image of a double crystalline PE494.9-b-PEO515.2 diblock copolymer. The long edge on lamellae in the center of the image correspond to the polyethylene block crystals. To the top and the bottom of the image, flat on lamellae can be observed, which can correspond to both PE and PEO block crystals. The thin vertical short lamellae on the middle of the image (looking like fish bones) are most probably poly(ethylene oxide) lamellae. Author: Ms. Eider Matxinandiarena

2018 Photography contest winner

Centipede
2018 Awarded picture: "Centipede" by Mr. Jesus Alvaro Iregui. Description: AFM phase image of an electrospun PCL-DGEBA nanofiber. Due to the spinning process, it is observed a high degree of crystalline orientation

4 ª Edición del Concurso de Fotografía Científica

Awarded picture: AFM phase image of the top surface of a dried film of latex with particles polymerized in presence of cellulose nanocrystals. Ms. Elodie Limousin

3ª Edición del Concurso de fotografía científica

"The eyes": Double crystalline nascent spherulite. AFM micrographs of a PEO-b-PCL diblock copolymer taken at a room temperature. Jordana Palacios.

1ª Edición del Concurso de fotografía científica

Foto ganadora:
Foto ganadora: "SEM micrograph of a dispersion of fluorinated polymer particles" by Ms. Ana B. López

 

 

Fotos presentadas en la  Edición del concurso Versión Pdf