Role of Zn And Polyaniline In Magnetic Nanocomposites And Enhanced Arsenic Adsorption Capacity In Wastewater

Polyaniline/Fe0.90Zn0.10Fe2O4 (PANI/Zn0.10Fe2.90O4) nanocomposites were synthesized by a chemical method and an onsite polymerization method. XRD patterns showed that the Zn0.10Fe2.90O4 grain size about 12 nm, while TEM image showed grain size from 10 to 20 nm. The results of Raman spectra and DTA analyses showed that PANI participated in part of the PANI/Zn0.10Fe2.90O4 nanocomposite samples. The grain size of PANI/Zn0.10Fe2.90O4 samples measured by SEM was about 35–50 nm. These results demonstrated the shell–core structures of the nanocomposite material. The magnetization measurements at room temperature showed that in 1250 Oe magnetic field, the saturation magnetic moment of PANI/Zn0.10Fe2.90O4 samples decreased from 71.2 to 42.3 emu/g when the PANI concentration increased from 0 % to 15 %. The surface area and porous structure of nanoparticles were investigated by the BET method at 77 K and a relative pressure P/P0 of about 1. The arsenic adsorption capacity of the PANI/Zn0.10Fe2.90O4 sample with the PANI concentration of 5 % was better than that of Fe3O4 and Zn0.10Fe2.90O4 in a solution of pH 7. In the solution with pH P14, the arsenic adsorption of magnetic nanoparticles was insignificant. Due to substitution of Fe ions by Zn transition metal and coating polyaniline, these materials could be reabsorbed and reused.

Synthesis and study of some properties of colloidal quantum dots of indium antimonide

Colloidal quantum dots of indium antimonide have been synthesized by a known technique. The shape and average diameters of quantum dots have been investigated by transmission electron microscopy using a transmission microscope. Controlling the size and shape of colloidal QDs provides information on the formation of the crystal structure of nanoparticles and their possible physical and optical properties. It has been found that InSb quantum dots are characterized by a polygonal shape. The results obtained for QDs correspond to the crystal lattice system of a semiconductor with a cubic crystal lattice structure. Elemental analysis of nanoparticles has been monitored by X-ray microanalysis. The experimental determination error was no more than one percent. The percentages of indium and antimony in QDs according to X-ray microanalysis data corresponded to the theoretical stoichiometry In: Sb = 1:1. Impurities of other elements constituted the level of trace amounts, which confirmed the chemical purity of the synthesized InSb QDs. The fluorescent properties of indium antimonide nanoparticles have been studied. It has been found that the luminescence intensity of InSb nanoparticles at room temperature is insignificant, which is in agreement with the literature data. The quantum yield does not exceed 1%, and the luminescence maximum lies in the range of 1040 nm.

A Newly Synthesized Silver Nanoparticles Mediated Phytomedicine from Linum usitatissimum for Dental Caries

The present study deals with the green synthesis of silver nanoparticles using seed extract of Linum usitatissimum (Flaxseed) with ethanol as solvent and examined for anticariogenic activity using disc diffusion method along with antioxidant activity using DPPH scavenging studies. The ethanolic seed extract revealed the presence of saponins, tannins, alkaloids, glycosides, counarins, anthocyanins, carbohydrates, leucoanthocyanin and xanthoproteins. Characterization of synthesized AgNPs were confirmed by FTIR to confirm the functional group involved in reduction of Ag+ ions, SEM to know the morphology of synthesized nanoparticles and XRD to study the crystallographic structure of nanoparticles. The antioxidant activity of synthesized AgNPs showed that the maximum inhibition of 88.88% for the seed-AgNPs and compared with the standard ascorbic acid (90.74%) was observed at concentration (100 µg/ml). The anticariogenic activity of synthesized AgNPs using the seed of Linum usitatissimum showed the maximum zone of inhibition for Streptococcus salivarius with the radius of 12 mm at a higher concentration of 100 µg/ml. Therefore, it is proposed that the synthesized seed-AgNPs played the efficient role against the antioxidant activity and forms the potential source for anticariogenic activity in dental caries application.

Optimization of Nanoparticles for Smart Drug Delivery: A Review

Nanoparticle delivery systems have good application prospects in the treatment of various diseases, especially in cancer treatment. The effect of drug delivery is regulated by the properties of nanoparticles. There have been many studies focusing on optimizing the structure of nanoparticles in recent years, and a series of achievements have been made. This review summarizes the optimization strategies of nanoparticles from three aspects—improving biocompatibility, increasing the targeting efficiency of nanoparticles, and improving the drug loading rate of nanoparticles—aiming to provide some theoretical reference for the subsequent drug delivery of nanoparticles.

Mechanism studies on the cellular internalization of nanoparticles using computer simulations: A review

Nanomaterial drug delivery systems have become one of the most important targeted therapy technologies. Although great efforts have been made to study the self-assembled mesoscopic structure of nanoparticles and understand drug loading and release mechanisms, the interaction between nanoparticles and cell membranes has not yet been clearly studied. Moreover, the research of experimental methods in this field has been greatly restricted due to its special time-space scale, so it is necessary to apply computer simulations to visualize the cell internalization of the nanoparticle. This review covers modelling methods and the current status and viewpoints of research on the influencing factors of the nanoparticle-biomembrane interaction mechanism. In particular, we discussed in detail the positive and negative effects of various nanoparticle properties. This article may assist researchers in rationally optimize the nanoparticle structure to improve therapeutic efficiency.

Virus Nanoparticles & Different Nanoparticles Affect Lung Cancer- A New Approach

In the past, few decades cancer has become a worldwide problem to mankind. Lung cancer is the most life-threatening among all cancer types. Non-small cell lung cancer (NSCLC) is the main reason for approximately 80% to 90% of deaths. Lack of early detection and incompetent conventional therapies is the leading cause for poor prognosis and overall survival rate of lung cancer patients. Immense progress in the field of nanotechnology and nanomedicine has given inspiration to the development of an alternative strategy in the treatment of lung cancer. The unique physicochemical properties of the nanoparticles likeability to cross the different biological barriers, effectiveness in delivering hydrophobic drugs which are difficult to incorporate in the body, and targeting in the particular disease sites have given rise to enormous advantages for nanoparticulate systems for the early diagnosis and active delivery of drugs for a better treatment for lung cancer. Recently, many formulations of nanocarriers like lipid-based, polymeric and branched polymeric, metal-based, magnetic, and mesoporous silica are being used in this treatment. Innovative strategies have been employed to utilize the multicomponent, three-dimensional structure of nanoparticles and modify it and construct a new structure moiety that has multifunctional capabilities. Developing such designs permits simultaneous drug delivery of chemotherapeutics as well as anticancer gene therapies to site-specific targets. In lung cancer, nanoparticle-based therapeutics is now breaking the ground in the diagnosis, imaging, screening, and treatment of primary and metastatic tumors. This review emphasizes the pathogenesis of lung cancer and its treatment by nanotechnology.

Fe2O3 Nanoparticles Doped with Gd: Phase Transformations as a Result of Thermal Annealing

The aim of this work is to study the effect of the phase composition of the synthesized Fe2O3-Gd2O3 nanoparticles on the efficiency of using magnetic hyperthermia as a basis for experiments. This class of structures is one of the most promising materials for biomedical applications and magnetic resonance imaging. In the course of the study, the dynamics of phase transformations of nanoparticles Fe2O3 → Fe2O3/GdFeO3 → GdFeO3 were established depending on the annealing temperature. It has been determined that the predominance of the GdFeO3 phase in the structure of nanoparticles leads to an increase in their size from 15 to 40 nm. However, during experiments to determine the resistance to degradation and corrosion, it was found that GdFeO3 nanoparticles have the highest corrosion resistance. During the hyperthermal tests, it was found that a change in the phase composition of nanoparticles, as well as their size, leads to an increase in the heating rate of nanoparticles, which can be further used for practical purposes.

Designing Stable Bimetallic Nanoclusters via an Iterative Two-Step Optimization Approach

Determining the energetically most favorable structure of nanoparticles is a fundamentally important task towards understanding their stability. In the case of bimetallic nanoclusters, their vast configurational space makes it especially...