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J.H. Kim and J.-H. Lee

Abstract

In order to fabricate graphite nanosheets from graphite flakes, edge-functionalized graphite nanosheets were prepared by a functionalization method using phthalic acid as the molecule to be grafted. A polyphosphoric acid/P2O5 solution containing graphite and phthalic acid were heated at different temperatures for 72 h in a nitrogen atmosphere. It was confirmed by transmission electron microscopy and atomic force microscopy that the resultant phthalic acid-functionalized graphite nanosheets had a large surface area of 20.69 μm2 in average and an average thickness of 1.39 nm. It was also found by X-ray diffractometry and Fourier transform infrared spectroscopy (FT-IR) analysis that the functionalization caused the formation of C=O bonds at the edges of the graphite nanosheets. The yield from this functionalization method was found to be dependent on the reaction temperature, only when it is between 70 and 130°C, because of the dehydration of phthalic acid at higher temperatures. This was confirmed by FT-IR analysis and the observation of low thermal energies at low temperatures.

Open access

K. Lee and G. Shin

Abstract

Hydroxyapatite (HA) is a material with outstanding biocompatibility. It is chemically similar to natural bone tissue, and has therefore been favored for use as a coating material for dental and orthopedic implants. In this study, RF magnetron sputtering was applied for HA coating. And Alkali treatment was performed in a 5 M NaOH solution at 60°C. The coated HA thin film was heat-treated at a range of temperatures from 300 to 600°C. The morphological characterization and crystal structures of the coated specimens were then obtained via FE-SEM, XRD, and FT-IR. The amorphous thin film obtained on hydrothermally treated nanorods transformed into a crystalline thin film after the heat treatment. The change in the phase transformation, with an enhanced crystallinity, showed a reduced wettability. The hydrothermally treated nanorods with an amorphous thin film, on the other hand, showed an outstanding wettability. The HA thin film perpendicularly coated the nanorods in the upper and inner parts via RF magnetron sputtering, and the FT-IR results confirmed that the molecular bonding of the coated film had an HA structure.

Open access

K. Mitura, M. Jedrzejewska-Szczerska, P. Ceynowa, M. Dudek, M. Cicha, I. Kotela and S. Mitura

Abstract

The purpose of this paper is to present the innovative design of microwave plasma system for modification of detonation nanodiamond particles (DNP) using a special rotating drum placed inside the reactor. Nanodiamond particles manufactured by detonation method reveal the biological activity depending on surface functionalization. Plasmachemical modification of detonation nanodiamond particles gives the possibility of controlling surface of nanodiamonds particles in biological tests. In this paper we would like to compare detonation nanodiamond (the grain sizes from 2 to 5 nm) with modified detonation nanodiamond in rotary reactor chamber, by microwave plasma activated chemical vapour deposition (MW PACVD) method in materials research (Raman and FT-IR spectroscopy) and in vitro examinations with full of human blood. The results indicate haemocompatibility of non-modified detonation nanodiamond and modified nanodiamond by MW PACVD method in rotary reactor chamber (modified ND-3) and the presence of haemolysis in commercial detonation nanodiamond.

Open access

A. Sobczak-Kupiec, B. Tyliszczak, K. Krupa-Żuczek, D. Malina, M. Piątkowski and Z. Wzorek

Abstract

Much effort has been invested in the development of biomaterials for the repair or replacement of hard tissue. The synthesis of composites based on mineral and organic constituents is nowadays extremely important for the development of materials for biomedical applications. In this paper we report the preparation and characterization of ceramic-polymer composites doped with gold nanoparticles. Properties and applications in medicine and dentistry of colloidal gold nanoparticles depends upon their size and shape. The influence of the presence of the metallic nanoparticles on the degradation process was investigated by pH and conductivity analyses of water filtrates. The nanocomposites were characterized with the use of X-ray Diffaction (XRD) and Fourier Transformed Infrared Spectroscopy (FT-IR) methods.

The results of in vitro tests confirmed that it is possible to produce hydroxyapatite/polymer (HA/polymer) composites doped with gold nanoparticles (AuNPs) for medical applications. Tests proved that content of gold nanoparticles in composites had influence on degradation behaviour of HA/Polymer/AuNPs in water environment.

Open access

M. Akbarzadeh, M. Zandrahimi and E. Moradpour

. Tsyganenko, FT-IR study of surface properties of unsupported MoS2, Catal. Today 70, 271-284 (2001). [16] L.Q. Mai, B. Hu, W. Chen, Y. Qi, C. Lao, R. Yang, Y. Dai, Z.L. Wang, Lithiated MoO3 nanobelts with greatly improved performance for lithium batteries, Advanced Materials 19, 3712-3716 (2007). [17] K. Miyoshi, Y. Chung, Surface diagnostics in tribology: Fundamental principles and applications, World scientific, 1993.

Open access

K. Bohács, J. Faitli, L. Bokányi and G. Mucsi

.1016/S1387-1811(98)00131-0. [26] D.W. Breck, Zeolite molecular sieves: structure, chemistry, and use, Wiley, 1973. https://books.google.co.in/books?id=aY0vAQAAIAAJ . [27] W. Mozgawa, M. Król, K. Barczyk, FT-IR studies of zeolites from different structural groups, Chemik. 65 , 671-674 (2011). [28] W. Mozgawa, The relation between structure and vibrational spectra of natural zeolites, J. Mol. Struct. 596 , 129-137 (2001). doi:10.1016/S0022-2860(01)00741-4. [29] D. Panias, I.P. Giannopoulou, T. Perraki, Effect of synthesis parameters on the