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Abstract:

We present micro-calorimetric specific heat measurements on different multiwall carbon nanotubes of large outer diameter, as a function of temperature in the range 10-120 K. A clear anomaly at 60 K with the shape of a peak is present in two of the samples, and both the height and the characteristic temperature of the peak are independent of magnetic field and do not exhibit thermal hysteresis, discarding magnetic degrees of freedom related to Fe seeds or contributions from adsorbed gases. These features suggest that the anomaly may be caused by a structural change. As the anomaly is also unaffected by induced intertube disorder, it may be related with a melting of orientational dislocations of individual tubes within multiwall nanotubes, an effect that was theoretically predicted to occur in carbon nanotubes and represents a distinctive feature of asymmetric molecular systems. © 2009 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:A specific heat anomaly in multiwall carbon nanotubes as a possible sign of orientational order-disorder transition
Autor:Jorge, G.A.; Bekeris, V.; Escobar, M.M.; Goyanes, S.; Zilli, D.; Cukierman, A.L.; Candal, R.J.
Filiación:Laboratorio de Bajas Temperaturas, Departamento de Física, FCEyN-UBA, Pab. 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Laboratorio de Polímeros y Materiales Compuestos, Departamento de Física, FCEyN-UBA, Pab. 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Química Inorgánica, Analítica y Química Física, FCEyN-UBA, Pab. 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
PINMATE, Departamento de Industrias, FCEyN-UBA, Pab. Industrias, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Instituto de Fisicoquímica de Materiales, Ambiente y Energía, CONICET-UBA, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Degrees of freedom (mechanics); Order disorder transitions; Specific heat; Thermal variables measurement; Yarn; Adsorbed gas; Characteristic temperature; Molecular systems; Multiwall nanotubes; Orientational orderings; Outer diameters; Thermal hysteresis; Multiwalled carbon nanotubes (MWCN)
Año:2010
Volumen:48
Número:2
Página de inicio:525
Página de fin:530
DOI: http://dx.doi.org/10.1016/j.carbon.2009.09.073
Título revista:Carbon
Título revista abreviado:Carbon
ISSN:00086223
CODEN:CRBNA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086223_v48_n2_p525_Jorge

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Citas:

---------- APA ----------
Jorge, G.A., Bekeris, V., Escobar, M.M., Goyanes, S., Zilli, D., Cukierman, A.L. & Candal, R.J. (2010) . A specific heat anomaly in multiwall carbon nanotubes as a possible sign of orientational order-disorder transition. Carbon, 48(2), 525-530.
http://dx.doi.org/10.1016/j.carbon.2009.09.073
---------- CHICAGO ----------
Jorge, G.A., Bekeris, V., Escobar, M.M., Goyanes, S., Zilli, D., Cukierman, A.L., et al. "A specific heat anomaly in multiwall carbon nanotubes as a possible sign of orientational order-disorder transition" . Carbon 48, no. 2 (2010) : 525-530.
http://dx.doi.org/10.1016/j.carbon.2009.09.073
---------- MLA ----------
Jorge, G.A., Bekeris, V., Escobar, M.M., Goyanes, S., Zilli, D., Cukierman, A.L., et al. "A specific heat anomaly in multiwall carbon nanotubes as a possible sign of orientational order-disorder transition" . Carbon, vol. 48, no. 2, 2010, pp. 525-530.
http://dx.doi.org/10.1016/j.carbon.2009.09.073
---------- VANCOUVER ----------
Jorge, G.A., Bekeris, V., Escobar, M.M., Goyanes, S., Zilli, D., Cukierman, A.L., et al. A specific heat anomaly in multiwall carbon nanotubes as a possible sign of orientational order-disorder transition. Carbon. 2010;48(2):525-530.
http://dx.doi.org/10.1016/j.carbon.2009.09.073