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Tuning the Size of Gold Nanoparticles with Repetitive Oxidation-reduction Cycles

1Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA

American Journal of Nanomaterials. 2015, 3(1), 15-21
doi: 10.12691/ajn-3-1-2
Copyright © 2015 Science and Education Publishing

Cite this paper:
Steve Y. Rhieu, Vytas Reipa. Tuning the Size of Gold Nanoparticles with Repetitive Oxidation-reduction Cycles. American Journal of Nanomaterials. 2015; 3(1):15-21. doi: 10.12691/ajn-3-1-2.

Correspondence to: Vytas  Reipa, Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. Email:;


A simple method to control the size of gold nanoparticles (AuNP) using repetitive oxidation-reduction cycles is described. First, AuNP are shown to be readily immobilized onto an indium-doped tin oxide coated glass surface using cyclic voltammetry nanoparticle containing citrate buffer. Subsequently, the attached AuNPsize can be reduced to a desired level by potential cyclingin the range from 0 V to +1.1 V (vs. Ag/AgCl).Gradual AuNPdiameter decrease was attributed to the formation of gold oxide upon anodic potential sweep and the partial solubilization of the Au(III) species during subsequent reduction of gold oxide in the absence of gold chelator (e.g.,Cl-, Br-, or CN-) normally necessary for anodic gold dissolution.



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Morphological and Chemical Composition Characterization of Commercial Sepia Melanin

1UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies,

2University of South Africa, Pretoria-South Africa

3Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Cape Town, South Africa

4Laboratoire de Photonique et de nanofablication, Groupe de Physique du Solide et des Science matériaux (GPSSM), Faculté de Science et Techniques, Université Cheikh Anta Diop de Dakar(UCAD), Dakar, Sénégal

5CSIR- National Centre for Nano-Structured Materials, Pretoria, South Africa

6University of South Africa, Pretoria-South Africa;Department of Physics, Florida Research Centre, University of South Africa, Florida-South Africa

American Journal of Nanomaterials. 2015, 3(1), 22-27
doi: 10.12691/ajn-3-1-3
Copyright © 2015 Science and Education Publishing

Cite this paper:
Agnes Mbonyiryivuze, Z. Y. Nuru, Balla Diop Ngom, Bonex Mwakikunga, Simon Mokhotjwa Dhlamini, Eugene Park, Malik Maaza. Morphological and Chemical Composition Characterization of Commercial Sepia Melanin. American Journal of Nanomaterials. 2015; 3(1):22-27. doi: 10.12691/ajn-3-1-3.

Correspondence to: Agnes  Mbonyiryivuze, UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies,. Email:


Melanins are difficult to characterize because of their intractable chemical properties and the heterogeneity in their structural features. Melanin pigments, in fact, are composed of many different types of monomeric units that are connected through strong carbon-carbon bonds. Its high insolubility and undefined chemical entities are two obstacles in its complete characterization. The morphological characterization and particle size distribution for sepia melanin by Scanning Electron Microscopy (SEM) on surface structure and Transmission Electron Microscopy (TEM) to confirm the morphology obtained from SEM was done. Both results show that Sepia melanin is formed by many aggregates agglomerated together. These aggregates are formed also by small spherical granules with different size distributions that have been determined using image-J software. The small granule diameter obtained from different TEM and SEM micrographs were 100-200nm. EDS reveals that C and O were the most abundant in sepia melanin with concentration average concentrations of about 57% and 24% respectively. The major compositions of sepia melanin are C, O, Na, Cl, while the minor are Mg, Ca, K, S and N. From TEM micrograph at high resolution, it was possible to measure the distance between polymers layers of sepia melanin using image-J software and it was 0.323 nm = 3.23 Å.



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Synthesis and Mechanical Characterisation of Aluminium-Copper-Alumina Nano Composites Powder Embedded in Glass/Epoxy Laminates

1Department of Aeronautical Engineering, IARE, Hyderabad, Telangana

2Metallurgy & Material Sciences Department, IIT Madras, Chennai, TamilNadu

3Geetam University, Hyderabad, Telangana

American Journal of Nanomaterials. 2015, 3(1), 28-39
doi: 10.12691/ajn-3-1-4
Copyright © 2015 Science and Education Publishing

Cite this paper:
P K Dash, Prof. B. S. Murty, R B Karthik Aamanchi. Synthesis and Mechanical Characterisation of Aluminium-Copper-Alumina Nano Composites Powder Embedded in Glass/Epoxy Laminates. American Journal of Nanomaterials. 2015; 3(1):28-39. doi: 10.12691/ajn-3-1-4.

Correspondence to: P  K Dash, Department of Aeronautical Engineering, IARE, Hyderabad, Telangana. Email:


This paper presents the synthesis and mechanical properties study of Aluminum-Copper nanocomposite powders with variation in volume percentages of alumina. The powders were synthesized using mechanical alloying (high energy ball milling technique). Samples of size 2010 mm were produced from nanocomposite powders by spark plasma sintering technique and conventional sintering method. The microstructural verifications were carried out using X-ray diffraction. Transition electron microscopy were used to determine the phases formed and size of the particles. Thermal analysis and hardness of these samples were measured by conducting DSC and Vickers’s Hardness Test. Also, the powders of ACANC were embedded into Glass/Epoxy laminates for further identification of NC powders effects on mechanical properties like tensile and compressive strength. The samples prepared using conventional sintering technique had gone through two different types of annealing before sintering and shown enhanced hardness, yield strength and increment in density. The nanocomposite embedded laminates have shown improved tensile, compression and hardness values in compare to virgin specimens.



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