ADNR

ADNR, Aggregated diamond nanorods (zagregowane nanopręty diamentowe) – alotropowa odmiana węgla, najtwardszy i najmniej ściśliwy materiał znany obecnie ludzkości.

Współczynnik sprężystości objętościowej ADNR wynosi 491 GPa, podczas gdy dla diamentu wynosi on 442 GPa[1]. ADNR jest o 0,3% gęstszy od diamentu i twardszy zarówno od diamentu typu IIa, jak i fulerytu.

Wytworzenie ADNR wymaga sprasowania fulerenów w prasie diamentowej pod ciśnieniem 2-20 GPa w temperaturze 300-2500 K[2][3][4][5]. Powstała struktura składa się z posczepianych diamentowych prętów o średnicy 5-20 nm i długości rzędu 1 μm.

Przypisy

  1. ↑ Aggregated Diamond Nanorods, the Densest and Least Compressible Form of Carbon. [dostęp 2009-04-14]. [zarchiwizowane z tego adresu (2009-03-25)].
  2. ↑ M.E. Kozlov, M. Hirabayashi, K. Nozaki, M. Tokumoto i inni. Superhard form of carbon obtained from C_{60} at moderate previous termpressure. „Synthetic Metals”. 70 (1–3), s. 1411–1412, 15 March 1995. Elsevier. DOI: 10.1016/0379-6779(94)02900-J. 
  3. ↑ V.D. Blank et al. „Ultrahard and superhard carbon phases produced from C60 by heating at high previous termpressure: structural and Raman studies” Physics Letters A 205 (1995) 20.
  4. ↑ H. Szwarc et al. „Chemical modifications of C60 under the influence of pressure and temperature: from cubic C60 to diamond” Synthetic Metals 77 (1996) 26.
  5. ↑ V. D. Blank et al. „Phase transformations in solid C60 at high-pressure-high-temperature treatment and the structure of 3D polymerized fullerites” Physics Letters A 220 (1996) 149.

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