Sample records for TRIQUITOS (whiskers)
from WorldWideScience.org

Sample records 1 - 11 shown.



1

Whiskers in indium tin oxide films obtained by electron beam evaporation

Castañeda, S. I.; Rueda, F.; Díaz, R.; Ripalda, J. María; Montero Herrero, Isabel
1998-02-15

Digital.CSIC (Spain)

3

Stimulus dependence of barrel cortex directional selectivity

Puccini, Gabriel D.; Compte, Albert; Maravall, Miguel
2006-12-27

Digital.CSIC (Spain)

4

Shifts in coding properties and maintenance of information transmission during adaptation in barrel cortex

Maravall, Miguel; Petersen, Rasmus S.; Fairhall, Adrienne L.; Arabzadeh, Ehsan; Diamond, Mathew E.
2007-01-23

Digital.CSIC (Spain)

5

Genesis of filamentary pyrite associated with calcite crystals.

K. Bonev, Ivan; García Ruiz, Juan Manuel; Atanassova, Radostina; Otalora, Fermín; Petrussenko, Svetoslav
2005-11-01

Digital.CSIC (Spain)

6

Diverse and Temporally Precise Kinetic Feature Selectivity in the VPm Thalamic Nucleus

Petersen, Rasmus S.; Brambilla, Marco; Bale, Michael R.; Alenda, Andrea; Panzeri, Stefano; Montemurro, Marcelo A.; Maravall, Miguel
2008-12-10

Digital.CSIC (Spain)

8

Chiral symmetry breaking and polymorphism in 1,1’-binaphthyl melt crystallization.

Sainz-Díaz, C. Ignacio; Martín-Islán, Africa P.; Cartwright, Julyan H. E.
2005-09-20

Digital.CSIC (Spain)

9

Chiral Symmetry Breaking during Crystallization: An Advection-Mediated Nonlinear Autocatalytic Process

Cartwright, Julyan H. E.; García-Ruiz, Juan Manuel; Piro, Oreste; Sainz-Díaz, C. Ignacio; Tuval, Idan

4 pages, 3 images.-- PACS nrs.: 81.10.Aj, 47.52.+j, 47.55.Kf, 68.70.+w. | When a chiral chemical compound crystallizes from solution or from its melt, stirring often results in the formation of crystals of just one of the two possible enantiomers, while without fluid advection, both enantiomers are ...

DRIVER (Spanish)

10

Chiral Symmetry Breaking during Crystallization: An Advection-Mediated Nonlinear Autocatalytic Process

Cartwright, Julyan H. E.; García Ruiz, Juan Manuel; Piro, Oreste; Sainz-Díaz, C. Ignacio; Tuval, Idan
2004-04-01

Digital.CSIC (Spain)

11

A New Route Towards The Preparation Of A Biodegradable Nanocomposite Based On Chitin Whiskers From Exoskeleton Of Shrimp And Polycaprolacton

Castillo, Verónica; Matos, Mireya; Müller, Alejandro J.
2003-01-01

Resumen en español Una Nueva Ruta Para La Prepararacion De Nanocompuestos Biodegradables Basados En Whiskers De Quitina Extraidos De Exoesqueletos De Camarones Y Policaprolactona El objetivo principal de este trabajo fue explorar la posibilidad de elaborar materiales nanocompuestos utilizando whiskers de a -quitina como agente reforzante y poli( e -caprolactona), PCL, como matriz polimérica. Los whiskers fueron obtenidos a partir de la hidrólisis ácida de quitina purificada extraíd (mas) a a partir del exoesqueleto del camarón. Estos whiskers presentaron un factor de forma igual a 15, con una longitud promedio de 300 nm. Una vez obtenida la suspensión acuosa de whiskers de quitina, se desarrolló un método en nuestro laboratorio para cambiar el solvente (primero a metanol y luego a tolueno), con el fin de incorporar las nanofibras en suspensiones de polímeros no solubles en agua tales como PCL. Se preparó entonces una suspensión no floculante de whiskers de quitina en tolueno mediante la incorporación de un surfactante adecuado. La dispersión de los whiskers fue mejor en medio acuoso que en tolueno, indicando que la dispersión en este último medio podría mejorarse con un surfactante más eficiente que el empleado en este trabajo. Finalmente, experimentos preliminares mostraron que las películas de PCL/whiskers de quitina pueden ser preparadas disolviendo primero la PCL en la suspensión de tolueno y luego evaporando el solvente. Los resultados obtenidos mediante calorimetría diferencial de barrido demostraron el efecto nucleante de los whiskers de quitina en la PCL así como un ligero incremento en la cristalinidad. La eficiencia de los whiskers como agentes de nucleación de la PCL fue estimada mediante la comparación del incremento en la temperatura de cristalización obtenida con la del material autonucleado idealmente. Se encontró un valor de eficiencia cercano a 40% así como un aumento de 20% en la cristalinidad con un 5% de quitina empleado. Resumen en inglés The main objective of this work was to explore the possibility of future preparation of nanocomposites using a-chitin whiskers as a reinforcing agent and poly( e -caprolactone), PCL, as the matrix polymer. Whiskers were successfully obtained as a result of the acid hydrolysis of purified chitin extracted previously from the exoskeleton of shrimp. These whiskers had a form factor of 15, with an average length of 300 nm. Once an aqueous suspension of chitin whiskers was pro (mas) duced, we developed a method in this paper to change the solvent (first to methanol and then to toluene), in order to incorporate the nano-fibers in non-water soluble polymers like PCL. A non flocculating suspension of the whiskers in toluene was prepared by means of the incorporation of a suitable surfactant. The dispersion of the whiskers was better in the aqueous medium than in toluene, indicating that the dispersion in the latter medium could be improved if a more efficient surfactant is found. Finally, preliminary experiments showed that PCL/chitin whiskers films can be prepared by first dissolving the PCL in the toluene suspension and later evaporating the solvent. Differential Scanning Calorimetry experiments demonstrated that a nucleating effect of the whiskers on the PCL was induced as well as a small increase in crystallinity. The efficiency of the chitin whiskers as nucleating agents for PCL was estimated by comparing the increased in crystallization temperature obtained with that of ideally self-nucleated material. When 5% chitin was employed a nucleating efficiency closed to 40% was achieved as well as 20% increase in crystallinity.

Scientific Electronic Library Online (Spanish)