Journal of Nanotechnology and Nanomaterials

Research Article Open Access

Theoretical Investigations of Dye-Sensitized Solar Cells

Jing Chen , Andreas L. Vishart , Stephan P. A. Sauer , Kurt V. Mikkelsen

This presentation considers theoretical investigations of dye-sensitized solar cells (DSSC). Theoretical methods were applied to investigate the interactions between titanium dioxide nanoparticles and sensitizers. The ONIOM model was used to obtain the geometries of different conformers of dye molecules with TiO₂ and their binding energies. TD-DFT calculations were carried out to obtain the absorption spectra and the relative orbital energy levels of sensitizers and TiO₂.

Review Article Open Access

Key Features in the Design and Function of Nanocarriers for Intranasal Administration of Gene Therapy in Huntington Disease

Oksana Fihurka , Stephen Aradi , Vasyl Sava , Juan Sanchez-Ramos

A major obstacle to fulfilling the therapeutic promise of gene therapies for hereditary brain diseases, such as Huntington’ Disease (HD), is the requirement for viral vectors and/or an invasive delivery system (stereotaxic injection into brain or infusion into the intrathecal space). HD is an autosomal dominant neurodegenerative disease for which several clinical trials have demonstrated gene-lowering effects following intrathecal administration.

Commentary Open Access

Immobilized Cell Bioreactor Industrialization in the Development of an Innovative Optical Biosensor Technology

Athanasios A. Koutinas , Theano Petsi , Athanasia Panitsa , Maria Kanellaki

This commentary shows the development of a new optical biosensor, based on cell immobilization of Pseudomonas Fluorescens HK44, in nano and micro-tubular cellulose (TC) and a mixture of carbohydrate nanotubes (CHNTs) and carbohydrate micro-tubes (CHMTs). Methodology follows, this biocatalyst can be industrialized with the use of a single tank immobilized cell bioreactor (ICB).

Research Article Open Access

Oxidation and TD-DFT of Toxic Acriflavine Hydrochloride Dye by Potassium Permanganate in Neutral Media: Kinetics and Removal of Dyes from Wastewater

Samia M. Ibrahim , Ahmed F. Al-Hossainy , Hazim M. Ali , Mohamed Abd El Aal , Nasser Farhan

Fabrication of dye thin films is accomplished through physical vapor deposition with a thickness of 150 ± 5 nm. Kinetically, the reduction of permanganate ion as a multi-equivalent oxidant by acriflavine hydrochloride (ACFH) in a neutral medium has been studied spectrophotometrically. In the presence of a pseudo-first-order reaction, the experimental results suggest fractional first-order kinetics in [ACFH] and a first-order dependency in [MnO₄^-]. 

Research Article Open Access

Enhanced Structural and Morphological Properties of Doped Cobalt Zinc Ferrite

Asmaa Reda Abd El-Salam , K. E. Rady , Ezzat A. ELFadaly , Mobarak Hassan Aly

In this study, Mn²⁺ substituted Co0._8−x Mn_x Zn_0.2 (where x = 0.0, 0.1, 0.2, and 0.3) ferrites are prepared by a coprecipitation method to study the effect of Mn²⁺ⁱons on the structural and morphological properties. These ferrites are characterized by X-ray powder diffraction (XRD), and Fourier transform infrared. X-ray diffraction patterns of the prepared samples confirm partial substitution of Mn²⁺ ions that does not change the basic structure of Co_0.8 Zn_0.2 Fe₂O₄.