Nanocarbon-Coated Porous Anodic Alumina for Bionic Devices

Abstract

A highly-stable and biocompatible nanoporous electrode is demonstrated herein. The electrode is based on a porous anodic alumina which is conformally coated with an ultra-thin layer of diamond-like carbon. The nanocarbon coating plays an essential role for the chemical stability and biocompatibility of the electrodes; thus, the coated electrodes are ideally suited for biomedical applications. The corrosion resistance of the proposed electrodes was tested under extreme chemical conditions, such as in boiling acidic/alkali environments. The nanostructured morphology and the surface chemistry of the electrodes were maintained after wet/dry chemical corrosion tests. The non-cytotoxicity of the electrodes was tested by standard toxicity tests using mouse fibroblasts and cortical neurons. Furthermore, the cell–electrode interaction of cortical neurons with nanocarbon coated nanoporous anodic alumina was studied in vitro. Cortical neurons were found to attach and spread to the nanocarbon coated electrodes without using additional biomolecules, whilst no cell attachment was observed on the surface of the bare anodic alumina. Neurite growth appeared to be sensitive to nanotopographical features of the electrodes. The proposed electrodes show a great promise for practical applications such as retinal prostheses and bionic implants in general.

Self-ordered Porous Alumina Fabricated via Phosphonic Acid Anodizing

“…At the end of the 1990s, the self-ordering behavior of porous alumina was reported via anodizing under optimal electrochemical conditions, including the anodizing voltage, temperature, and solution concentration, due to the rearrangement of the porous alumina during long-term anodizing [5][6][7][8]. High-aspect-ratio and highly ordered porous alumina with an ideal honeycomb structure can be easily fabricated via self-ordered anodizing and has been widely used by many researchers as a template and membrane for various nanotechnologies [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Engineering of the structural and morphological characteristics of MWCNTs employing a nano-dimensional binary oxide coating with enhanced thermal oxidation resistance properties for the tailoring of their reinforcement potential

“…3d), thereby clearly supporting the attachment of the MgAl-binary oxide spinel structure to active sites of the carboxylic-acid-treated CNT network and relating well to obtained structural results for nano-hybrid structures. 68,70,72…”

“…66 The spectrum also provides an exciting result, revealing three additional weak peaks at 289.76 eV, 283.2 eV, and 281.79 eV, which are strongly suggestive of the existence of surface carbonate (O-CQO), C-Mg, and C-Al bonds, respectively. 67,68 For the O 1s spectrum, three peaks were clearly identified at 530.68 eV, 532.21 eV, and 533.85 eV, where the first peak might arise from the combined effects of O-C bonds and O sites of the spinel lattice, and the second and third peaks might evolve due to the combined existence of metal-oxygen bonds, OQC linkages, and oxygen in the associative ring structure. 66,[69][70][71] Detailed analysis of the Al 2p and Mg 1s peaks strongly highlights the existence of Al-O and very weak Al-OH bonds at 74.88 eV and 75.79 eV, respectively, and Mg-O bonds at 1304 eV, which is in line with the results obtained from the FTIR spectra of both the heat-treated MgAl 2 O 4 spinel phase (Fig.…”

“…3d), thereby clearly supporting the attachment of the MgAlbinary oxide spinel structure to active sites of the carboxylic-acidtreated CNT network and relating well to obtained structural results for nano-hybrid structures. 68,70,72 3.3.3 TEM, HRTEM, and SAED analysis of MgAl-binaryoxide-coated MWCNTs. Importantly, herein TEM imaging provides another method to elucidate the actual role of functionalized surface chemistry in controlling the morphological integrity of the optimized oxide-loaded nanohybrid architecture after exposure to thermal treatment.…”

Особенности Взаимодействия Гидроксиапатита Кальция И Углеродных Нанотрубок При Осаждении Из Водных Растворов

“…Негативное воздействие ультрадисперсных частиц, загрязняющих окружающую среду (угольная и кварцевая пыль, сварочные пары, асбест и искусственные волокна), на организм человека достаточно интенсивно исследуется в последнее время [2][3][4][5]. Химическая реактивность и биологическая активность наноматериалов часто в значительной степени превышают аналогичные характеристики крупноразмерных материалов [6][7][8][9] 1, c, d). ИК-спектры (спектрометр Nexus Nicolet, диапазон 4000−400 cm −1 ) продуктов синтеза (исходного ГА и ГА в составе КМ ГА/УНТ) были типичны для стехиометрического ГА с характерными полосами поглощения, обусловленными основными структурными группировками ГА [10].…”