Dehydroplycondensation of acetylene

Kudryavtsev, Yu. P.

doi:10.1007/978-94-011-4742-2_5

Cited by 3 publications

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Carbyne‐Containing Surface Coatings

Demyashev

Taube

2006

Wiley Encyclopedia of Biomedical Engineering

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Synthesis of carbyne‐containing surface coatings for a variety of biomedical applications is a matter of a great importance. Carbynes with a one‐dimensional chain‐like molecular structure that were discovered a few decades ago represent a basic allotropic form of carbon equally with diamond and graphite. Carbynes appear as quasi‐crystalline structures of carbon‐chains with double (CC) n and alternating single/triple (–CC–) n covalent bonds. The aim of this article is to summarize existing information about carbyne‐containing surface coatings for biomedical applications and to outline novel approaches for synthesis of such functional biomaterials in the form of coatings. The first research and development of carbyne‐containing materials demonstrated their great potential for biomedical applications. Carbynes possess a high biocompatibility, low litho‐ and thrombogenic activity, high resistance to chemically aggressive biological liquids, antibacterial and antifungal activities, and so on. Equally with the state‐of‐the‐art biomaterials in question, three novel carbyne‐containing surface coatings are here highlighted: (1) carbynes‐W 3 C composite coatings chemically vapor‐deposited, (2) carbyne‐containing layers formed by electropolishing of the surface of transition metal carbides, and (3) microwave‐induced defluorination of polytetrafluoroethylene (PTFE or Teflon) on the interface of “PTFE‐Water” at ∼95°C. This article demonstrates opportunities to synthesize the carbyne‐containing surface coatings that can be practically realized for biomedical applications. The three coating processes afford the opportunity to modify the surfaces of the basic artificial implants; i.e., metallic/ceramic artificial implants can be coated by the Carbynes‐W 3 C composite; artificial implants manufactured from transition metal alloys can be electrochemically modified by carbyne‐containing coating; and PTFE‐implants can be modified by microwave‐induced surface defluorination leading to the formation of a carbyne‐containing surface layer.

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Carbyne‐Containing Surface Coatings

Demyashev

Taube

2006

Wiley Encyclopedia of Biomedical Engineering

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Impact of Halogen Termination and Chain Length on π-Electron Conjugation and Vibrational Properties of Halogen-Terminated Polyynes

Melesi,

Marabotti,

Milani

et al. 2024

J. Phys. Chem. A

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We explored the optoelectronic and vibrational properties of a new class of halogen-terminated carbon atomic wires in the form of polyynes using UV−vis, infrared absorption, Raman spectroscopy, X-ray single-crystal diffraction, and DFT calculations. These polyynes terminate on one side with a cyanophenyl group and on the other side, with a halogen atom X (X = Cl, Br, I). We focus on the effect of different halogen terminations and increasing lengths (i.e., 4, 6, and 8 sp-carbon atoms) on the π-electron conjugation and the electronic structure of these systems. The variation in the sp-carbon chain length is more effective in tuning these features than changing the halogen end group, which instead leads to a variety of solid-state architectures. Shifts between the vibrational frequencies of samples in crystalline powders and in solution reflect intermolecular interactions. In particular, the presence of head-to-tail dimers in the crystals is responsible for the modulation of the charge density associated with the π-electron system, and this phenomenon is particularly important when strong I••• N halogen bonds occur.

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