International Journal Of Bio-Inorganic Hybrid Nanomaterials
Volume:6 Issue: 3, Autumn 2017

Detecting is the most important section in all kinds of sensors. In this regard, the amplification of surface plasmon resonance intensity of gold colloids nanoparticles (GNPs) was studied in the presence of several ions. GNPs were synthesized and then capped by thiocyanate and characterized via DLS and TEM image. In the next step the effect of different concentrations of ions such as iron, copper and iodide, for the suitable amplification of surface plasmon resonance intensity of GNPs, were investigated. This amplification studies were followed by UV-Vis and fluorescence spectroscopy. The results also could be observed by the naked eye. It was showed that iron ions were the best amplifier for the surface plasmon resonance of GNPs. The results lead to an extraordinary change signals of GNP peaks and developed a simple and new probe for tracking immunosensor system. This process seems to promote the sensitivity and selectivity of colorimetric biosensors rather than the previous method.

Optically active bionanocomposite membranes composed of polyester(PE) and cellulose /silica bionanocomposite (BNCs) are a novel method to enhance gas separation performance. Commercially available silica nanoparticles were modified with biodegradable nanocellulose through ultrasonic irradiation technique. Transmission electron microscopy (TEM) analyses showed that the cellulose/silica composites were well dispersed in the polymer matrix on a nanometer scale.The tensile stress–strain of the hybrids was investigated, and the resulting nanocomposites showed good mechanical properties.Thermo gravimetric analysis (TGA) data indicated an increase thermal stability of the PE/BNCs in comparison with the pure polymer. The permeability and selectivity of the PE/BNCs membranes as a function of the BNCs weight percentage were studied and the results obtained from gas permeation experiments showed that adding BNCs to the PE membrane structure increased the permeability of the membranes. Increasing the cellulose/silica mass fraction in the membrane increased the diffusion coeffificients of gases considered in the current study. Further, antimicrobial test against pathogenic bacteria was carried out.

Biocompatible materials used for the fabrication of dental crowns were studied. Patients were treated with Gold, Porcelain and Zirconia crowns. Dental crowns were selected according to patient’s clinical status and needs. We found that Gold crowns had low patient acceptance because of poor aesthetics and high cost. Gold crowns could not be used opposite to amalgam restorations for the fear of galvanic shock. Porcelain crowns were extremely aesthetic and did not cause galvanic shock. Porcelain crowns however could not be used in patients with habitual clenching of teeth condition called as Bruxism. Zirconia was found to be the most aesthetic and the most biocompatible with high mechanical strength.

A simple, highly sensitive, accurate and selective method for determination of trace amounts of Ni2 in water samples. In this paper, Dioctylphthalate (DOP) was used to encapsulate nano-Fe3O4 and produce a nano-Fe3O4-DOP sorbent based new sorbent was prepared. This was treated with ethylenediamine (ED) in another solvent-free procedure for the formation of a novel nano-Fe3O4-DOP-ED. Flame atomic absorption spectrometer was utilized for determination of Ni2. Some of the important parameters on the preconcentration and complex formation were selected and optimized. Under the optimized conditions the limit of detection (LOD) and limit of quantification (LOQ) were 0.25, 0.883 and the proposed method has a good reproducibility 0.88% (RSD %). The enrichment factor was 200 and the percentage of recovery was in the range of 95-100%. The method was successfully applied to the recovery of Ni2 in different type of water samples. Graphene oxide and its derivate such as magnetic nano- Fe3O4 -DOP- ED in this study is full of potential to use as an excellent adsorbent in the extraction method like solid phase extraction (SPE) and solid phase micro extraction (SPME).

A superhydrophobic surface is coated on the surface of a cloth by MTCS (methyltrichlorosilane) nanoparticles and then, it is modified by SiO2–m–FTCS (1H,1H,2H,2H-Perfluorododecyltrichlorosilane) nanoparticles. This surface is characterized by SEM(scanning electron microscopy), and FT-IR (Fourier transform-infrared microscopy) and also its contact angle is investigated in various conditions and an optimized condition is identified for industrial utilization.

In this study interaction of phenothiazine sulfur dye with (5, 5) armchair open-end boron nitride nanotubes (BNNTs) in interaction (with a length of 7 Å) was investigated. The impacts of the estereoelectronic effect associated with donor-acceptor electron delocalizations, dipole-dipole interactions and total steric exchange energies on the structural and electronic properties and reactivity of semiconductors of (5, 5) armchair open-end boron nitride nanotube (BNNT) in interaction with 7-hydroxy phenothiyazine 3-one sulphure dye was studied based on the Density Functional Theory (DFT) calculations by using the B3LYP/6-31G* level of theory in gas phase and water solution. Delocalization of charge density between the bonding or lone pair and antibonding orbitals calculated by NBO (natural bond orbital) analysis. These methods are used as a tool to determine structural characterization BNNTs during the adsorption reactions in the gas phase. In order to investigate of conductivity and electronic properties of (5, 5) open-end boron nitride nanotube (BNNT) in the reaction with 7-hydroxy phenothiyazine 3-one sulphure dye, the thermodynamic functions, the total electronic energy, dipole moment, orbital energies, charge density, density of state (DOS), LUMO-HOMO energy bond gaps, Adsorption energies (EAd) were calculated. The calculated LUMO-HOMO energy bond gap show that charge density transfer occurs within the molecules and the semi-conductivity of BNNTs could be justified.

The improvement of medication techniques that causes the reduction of toxicity and enhancement of drug effectiveness enjoys a special significance. Hence, in this research, many attempts have been made to use factored-in carbon nanotube for measurement and determination of the dose of anti-anxiety disorder drugs in human body’s liquids. In the first place, in order to possess more active sites, the multi-walled carbon nanotube (MWCNT) was factored-in by cyanuric chloride. Then, p-amino acetanilide was placed on the absorbent, as a ligand that has an exclusive suitable interaction with the buspirone drug. In order to confirm the synthesized nanostructure, different techniques, including infrared spectrometry (FT-IR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and energy dispersive spectroscopy (EDAX) were used and the results were analyzed. In order to determine the optimum conditions, the absorption of the drug under pH conditions and optimum time was studied. Finally, under optimum conditions, the absorption of the drug in blood plasma and urine were carried out by high performance liquid chromatography (HPLC).

Density functional theory calculations were carried out to study the interaction of heroin molecule with pristine and N-dopedTiO2 anatase nanoparticles. The oxygen atom of heroin molecule was found to be the binding site on the heroin molecule. In contrast, the binding site of TiO2 nanoparticle was positioned over the fivefold coordinated titanium atoms. The results showed that the adsorption energies of heroin on the considered nanoparticles followed the order N-doped TiO2> pristine (undoped) TiO2. The N-doped TiO2 nanoparticle was strongly favored with high sensitivity to heroin detection. Thus, the adsorption of heroin on the N-doped nanoparticle is more favorable in energy than the adsorption on the pristine one.The charge transfers were predicted based on Mulliken population analysis. The electron transfer from heroin to the TiO2 particles was in the order N-doped TiO2> pristine (undoped) TiO2.The significant overlaps in the PDOS spectra of the oxygen atom of heroin and titanium atom of TiO2 indicate that chemical bond was formed between adsorbate and nanoparticle. After the adsorption process, the electronic density in the highest occupied molecular orbitals was strongly distributed over the adsorbed heroin molecule.These processes eventually lead to the adsorption of heroin on the TiO2 particles.