Recovery of biotechnological products using aqueous two phase systems.

Electrical and magnetic transport properties of Ni–Cu–Mg ferrite nanoparticles prepared by sol–gel method

Structural and electromagnetic properties of yttrium-substituted Ni–Zn ferrites

Ni and NiFe alloys with different compositions have been successfully synthesized using a simple, surfactant-free polyol method. The morphological analysis demonstrated a uniform spherical nature of the alloys, with size range ∼10–30 nm. A very thin oxide layer was found to form over the alloy nanoparticles (NPs) which is weakly visible in TEM and later confirmed by XPS analysis. The magnetic properties of the Ni and NiFe NPs were measured using a vibrating sample magnetometer (VSM) at room temperature. The saturation magnetization value was found to be lowest in Ni and keeps on increasing with increasing Fe content in the composition. The resistivity, as revealed from I–V characteristics, was shown to be lowest for the permalloy (Ni80Fe20) phase, while the values increase with further increment in the Fe content. The microwave shielding properties of the Ni and its Fe alloy NPs were investigated in the Ku band range. The lower EM wave transmittance with good reflection and absorption coefficients is responsible for the high shielding values. All of the alloys tested in this investigation showed excellent microwave shielding properties ranging from −21 to −41 dB in the entire Ku band, for ∼1 mm thick samples. The lowest EMI shielding range (−21 to −29 dB) was noted for Ni NPs while the highest was observed in the case of permalloy (−30 to −41 dB). The rest of the NiFe combinations show intermediate shielding effectiveness as compared to Ni and permalloy. Certainly, all of the NiFe alloy combinations we tested showed excellent EMI shielding above −30 dB, with significant enhancements in the absorption shielding efficiency. These alloys are good candidates for EMI shielding having the ability to attenuate 99.9% of electromagnetic radiation.

Polyol derived Ni and NiFe alloys for effective shielding of electromagnetic interference

Green selective recovery of lanthanum from Ni-MH battery leachate using aqueous two-phase systems

Structural evolution and magnetic properties of nanocrystalline 50 Permalloy powders prepared by mechanical alloying

Structure and magnetic properties of ball-mill prepared nanocrystalline Ni–Zn ferrite powders at elevated temperatures

Measurement of partition coefficients of β-amylase and amyloglucosidase enzymes in aqueous two-phase systems containing poly(ethylene glycol) and Na2SO4/KH2PO4 at different temperatures

Extraction of stevioside using aqueous two-phase systems formed by choline chloride and K3PO4

Saffron stigmas are considered as one of the main sources for crocin extraction. Crocins have many therapeutic properties and applications in different industries such as food and cosmetic in which their extraction and purification will be useful commercially and clinically. This work presents a study on the partitioning of crocin in aqueous two-phase systems (ATPSs) composed of water, deep eutectic solvents (DESs), and acetonitrile (ACN). Two DESs based on choline chloride as the hydrogen bond acceptor (HBA) and urea and ethylene glycol as hydrogen bond donors (HBDs) were synthesized and considered as phase-forming components. Also, the effects of the hydrogen bonding, HBD species, weight percentages of DES, weight percentages of ACN, and temperature were investigated to evaluate the phase-forming ability of the ATPSs and the partitioning of crocin in these systems. It turned out that the choline chloride–urea/ACN system provides higher partition coefficients and a higher extraction efficiency of crocin under optimum conditions (40 wt % of DES, 50 wt % of ACN, and 25 °C). Moreover, the conformation of crocin in the choline chloride–urea/ACN system was explored using a UV–visible spectrophotometer (UV–vis) and Fourier transform infrared spectrometer (FT-IR), and no change was observed during the process. In the end, the UNIFAC model was applied to estimate the equilibrium data of both systems, in which the experimental data of two studied ATPSs were well described. 

Partitioning of Crocin in a Novel Aqueous Two-Phase System Composed of a Deep Eutectic Solvent and Acetonitrile

Sh. Shahriari

Papers

Structural evolution and magnetic properties of nanocrystalline 50 Permalloy powders prepared by mechanical alloying

Structure and magnetic properties of ball-mill prepared nanocrystalline Ni–Zn ferrite powders at elevated temperatures

Measurement of partition coefficients of β-amylase and amyloglucosidase enzymes in aqueous two-phase systems containing poly(ethylene glycol) and Na2SO4/KH2PO4 at different temperatures

Extraction of stevioside using aqueous two-phase systems formed by choline chloride and K3PO4

Partitioning of Crocin in a Novel Aqueous Two-Phase System Composed of a Deep Eutectic Solvent and Acetonitrile