scholarly journals The impact of solvent tanδ on the magnetic characteristics of nanostructured NiZn-ferrite film deposited by microwave-assisted solvothermal technique

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025003
Author(s):  
R. D. Ralandinliu Kahmei ◽  
Sarath Arackal ◽  
S. A. Shivashankar ◽  
Navakanta Bhat ◽  
Ranajit Sai
Keyword(s):  
Magnetic Characteristics ◽  
Ferrite Film ◽  
Solvothermal Technique ◽  
Microwave Assisted ◽  
The Impact

scholarly journals Effects of Process Parameters on the Color Quality of Anthocyanin-Based Colorants from Conventional and Microwave-Assisted Aqueous Extraction of Sweet Potato (Ipomoea batatas L.) Leaf Varieties

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 103
Author(s):  
Jin Mark D. G. Pagulayan ◽  
Aprille Suzette V. Mendoza ◽  
Fredelyn S. Gascon ◽  
Jan Carlo C. Aningat ◽  
Abigail S. Rustia ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Process Parameters ◽  
Ipomoea Batatas ◽  
Extraction Methods ◽  
Aqueous Extraction ◽  
Potato Leaf ◽  
Microwave Assisted ◽  
Color Quality ◽  
The Impact

The study aimed to evaluate the effects of process parameters (time and raw material weight (RMW)) of conventional (boiling for 10–45 min) and microwave-assisted (2–8 min) aqueous extraction on the color quality (i.e., lightness (L*), chroma (C*), and hue (H°) of anthocyanin –based colorants of red and Inubi sweet potato (Ipomoea batatas L.) leaves. Using response surface methodology, it was found that RMW and boiling time (BT) and microwave time (MT) generally had a significant (p < 0.05) effect on the color quality of the extract from both extraction methods. The effects were found to vary depending on the extraction method and variety of the leaves used. Both extraction methods produced a brown to brick-red extract from the Inubi variety that turned red-violet to pink when acidified. The red sweet potato leaves produced a deep violet colored extract that also turned red-violet when acidified. It is recommended that the anthocyanin content of the extracts be measured to validate the impact of the methods on the active agent. Nevertheless, the outcomes in this study may serve as baseline data for further studies on the potential of sweet potato leaf colorants (SPLC) as a colorant with functional properties.

scholarly journals Freeze versus Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material

2021 ◽  
Author(s):  
Aleksandra A. Jovanović ◽  
Steva M. Lević ◽  
Vladimir B. Pavlovic ◽  
Smilja B. Markovic ◽  
Rada V. Pjanovic ◽  
...  
Keyword(s):  
Spray Drying ◽  
Dry Weight ◽  
Drying Process ◽  
Scanning Calorimetry ◽  
Coating Agent ◽  
Microwave Assisted ◽  
Freeze Dried ◽  
Wild Thyme ◽  
The Impact ◽  
Spray Dried

Freeze drying was compared with spray drying regarding feasibility to process wild thyme drug in order to obtain dry formulations at laboratory scale starting from liquid extracts produced by different extraction methods: maceration, heat-, ultrasound-, and microwave-assisted extractions. Higher powder yield (based on the dry weight prior to extraction) was achieved by freeze than spray drying and lower loss of total polyphenol content (TPC) and total flavonoid content (TFC) due to the drying process. Gelatin as a coating agent (5% w/w) provided better TPC recovery by 70% in case of lyophilization and higher powder yield in case of spray drying by diminishing material deposition on the wall of the drying chamber. The resulting gelatin-free and gelatin-containing powders carried polyphenols in amount ~190 and 53-75 mg gallic acid equivalents GAE/g of powder, respectively. Microwave-assisted extract formulation distinguished from others by higher content of polyphenols, proteins and sugars, higher bulk density and lower solubility. The type of the drying process affected mainly position of the gelatin-derived -OH and amide bands in FTIR spectra. Spray dried formulations compared to freeze dried expressed higher thermal stability as confirmed by differential scanning calorimetry analysis and higher diffusion coefficient; the last feature can be associated with the lower specific surface area of irregularly shaped freeze-dried particles (151-223 &micro;m) compared to small microspheres (~8 &micro;m) in spray-dried powder.

scholarly journals A micromagnetic study: lateral size dependence of the macroscopic properties of rectangular parallelepiped Cobalt-ferrite nanoferromagnetic

2020 ◽  
Vol 4 (1) ◽  
pp. 16
Author(s):  
Nur Aji Wibowo ◽  
Susatyo Pranoto ◽  
Cucun Alep Riyanto ◽  
Andreas Setiawan
Keyword(s):  
Cobalt Ferrite ◽  
Size Dependence ◽  
Rectangular Parallelepiped ◽  
Magnetic Characteristics ◽  
Micromagnetic Simulations ◽  
Barrier Energy ◽  
Reversal Time ◽  
Curve Profile ◽  
20 Nm ◽  
The Impact

<span lang="EN-US">The purpose of this study is to provide systematic information through micromagnetic simulations related to the impact of particle size on the magnetic characteristics of Cobalt-ferrite MNP. The micromagnetic computations performed were based on LLG equation. The MNPs sample was simulated in the form of a rectangular parallelepiped with a thickness of 20 nm and square surface with lateral length varies from 10 to 80 nm at an interval of 10 nm. </span><span lang="EN-ID">The results of this study indicate that the size changes in Cobalt-ferrite MNP have a significant impact on various magnetic properties, such as the magnitude of the barrier energy, coercive and nucleation fields, magnetization rate, magnetization curve profile, and magnetization mode.</span><span lang="EN-ID">Cobalt-ferrite MNP with a size of 10 nm shows a single domain with a relatively short magnetization reversal time and high coercive field.</span>

scholarly journals Earth’s Arth’s Magnetic Field is Factor that Frges Cell Divsion. Reducing Cell’s Magnetic Characteristics Occurs Aging and Death

2020 ◽  
Vol 2 (1) ◽  
pp. 1-7
Author(s):  
Nikola Trifunovic ◽  
Keyword(s):  
Magnetic Field ◽  
Immune System ◽  
Cell Division ◽  
Magnetic Force ◽  
Evolutionary Process ◽  
Magnetic Characteristics ◽  
Crossing Over ◽  
Dna And Rna ◽  
The Impact ◽  
Cancerous Cells

Introduction Despite many studies on cell division, formation and treatment of cancer (Ca), there is not full explication of aging and death of cells. Everything in the Earth’s magnetic field (EMF) has paramagnetic and ferromagnetic characteristics. Hence tissue cells and organs have magnetic characteristics (Mc). This paper shows that EMF is a factor that impacts cell division. Anomalous magnetic fields (AMF) and unnatural EMF contributes to continuous cell division that causes cancer. Moreover, it shows that the magnetic characteristics of the nuclei, organelles and substances are tightly related to the metabolism of the cells. The article also explains when the immune system works the best, why it fails in preventing the formation of cancerous cells, and how aging reduces the defense of the organism against intruders. Results EMF influences all parts of the cells magnetic characteristics, which in turn impact metabolism. The sequences of the nucleotides in the construction of DNA and RNA match only by magnetic code. EMF impacts the process of crossing over which causes polymorphism and contributes to the evolution. A factor that stimulates cell division is EMF which boosts the metabolism and the immune system. All manifestations of aging are clearly explained by magnetic properties of cells. Intermolecular magnetic force (Mf) in cell varies because they depend on the number of divisions and temperature. With each division, telomeres lose 100-200 nucleotides which reduce the nucleus Mf and metabolism in the cells. The immune system weakens, because of the impact of Mf. Conclusion Natural EMF is a factor that infulences cell division. Magnetic characteristics of nuclei, organelles and substances enable metabolism in cell. EMF and magnetic characteristics of cells have a decisive contribution to the world’s evolutionary process. During cell division, Mf are decreasing in nucleus so less water enters the cell, resulting in accumulation of toxins. The functions of organs and particularly hormonal activity are declining, which leads to deposition of calcium salts in cartilage (in and around chondrocytes), and lower function of the immune system. All of the above are a manifestation of aging

scholarly journals Optimization of Commercial Microwave Assisted-Extraction Conditions for Recovery of Phenolics from Lemon-Scented Tee Tree (Leptospermum petersonii) and Comparison with Other Extraction Techniques

Foods ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 50
Author(s):  
Md Saifullah ◽  
Taiwo Olusesan Akanbi ◽  
Rebecca McCullum ◽  
Quan Van Vuong
Keyword(s):  
Solvent Ratio ◽  
Microwave Assisted Extraction ◽  
Plant Materials ◽  
Soaking Time ◽  
Tea Tree ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Irradiation Power ◽  
The Impact ◽  
Radiation Time

The lemon-scented tea tree (LSTT) is an Australian native herb and is a rich source of essential oil and phenolics. The ETHOS X extraction system is known as a commercial microwave-assisted extraction (MAE) system for extracting bioactive compounds from plant materials. This study investigated the influence of soaking time, radiation time, microwave power, and sample to solvent ratio on the extraction efficiency of polyphenols and antioxidant properties from lemon-scented tea tree leaves and optimized the extraction conditions using response surface methodology (RSM). The effectiveness of ETHOS X was further compared with ultrasound-assisted extraction (UAE) and shaking water bath (SWB) techniques. The results revealed that soaking time did not significantly affect the recovery of phenolics from the leaves (p > 0.05). Thus, soaking is not required for the ETHOS X extraction of polyphenols from LSTT leaves. RSM was successfully applied to explore the impact of ETHOS X extraction conditions and optimize the extraction conditions. Radiation time significantly affects the recovery yield of phenolics (p < 0.05) positively, whereas irradiation power and sample to solvent ratio adversely influenced the extraction yields of phenolics. The optimal ETHOS X extraction conditions were: radiation time of 60 min, irradiation power of 600 W, and sample to solvent ratio of 2 g/100 mL. Under these conditions, 119.21 ± 7.09 mg of phenolic, 85.31 ± 4.55 mg of flavonoids, and 137.51 ± 12.52 mg of proanthocyanidins can be extracted from a gram of dried LSTT leaves. In comparison with UAE and SWB, ETHOS X is not more effective for the extraction of phenolics than UAE and SWB. However, this technique can save half of the solvent volume compared to UAE and SWB techniques.

The impact of microwave-assisted thermal sterilization on the morphology, free volume, and gas barrier properties of multilayer polymeric films

2014 ◽  
Vol 131 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sumeet Dhawan ◽  
Christopher Varney ◽  
Gustavo V. Barbosa-Cánovas ◽  
Juming Tang ◽  
Farida Selim ◽  
...  
Keyword(s):  
Free Volume ◽  
Barrier Properties ◽  
Polymeric Films ◽  
Gas Barrier ◽  
Microwave Assisted ◽  
Thermal Sterilization ◽  
The Impact ◽  
Gas Barrier Properties

scholarly journals Magnetic Properties of La0.9A0.1MnO3 (A: Li, Na, K) Nanopowders and Nanoceramics

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1788
Author(s):  
Paweł Głuchowski ◽  
Ruslan Nikonkov ◽  
Robert Tomala ◽  
Wiesław Stręk ◽  
Tatsiana Shulha ◽  
...  
Keyword(s):  
Combustion Method ◽  
Magnetic Characteristics ◽  
X Ray ◽  
Alkali Ions ◽  
Structure And Morphology ◽  
Ceramic Samples ◽  
High Pressure Sintering ◽  
The Impact ◽  
Sintering Method ◽  
Scanning Electron

Nanocrystalline La0.9A0.1MnO3 (where A is Li, Na, K) powders were synthesized by a combustion method. The powders used to prepare nanoceramics were fabricated via a high-temperature sintering method. The structure and morphology of all compounds were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). It was found that the size of the crystallites depended on the type of alkali ions used. The high-pressure sintering method kept the nanosized character of the grains in the ceramics, which had a significant impact on their physical properties. Magnetization studies were performed for both powder and ceramic samples in order to check the impact of the alkali ion dopants as well as the sintering pressure on the magnetization of the compounds. It was found that, by using different dopants, it was possible to strongly change the magnetic characteristics of the manganites.

scholarly journals Determining the influence exerted by the static conditions of final squeezing on the compaction process of iron-based powder materials

2021 ◽  
Vol 1 (1 (109)) ◽  
pp. 63-68
Author(s):  
Anatoly Minitsky ◽  
Nataliya Minitska ◽  
Oleksandr Okhrimenko ◽  
Dmytro Krasnovyd
Keyword(s):  
Stressed State ◽  
Green Compact ◽  
Magnetic Characteristics ◽  
Powder Materials ◽  
Technological Parameters ◽  
The Press ◽  
Sensitive Characteristics ◽  
Static Conditions ◽  
The Impact ◽  
Static Pressing

This paper reports a study into the process of re-compaction of powder briquettes in the conditions of static pressing at a pressure of 800 MPa. The technological parameters of the pressing process have been analyzed, which make it possible to improve the compaction of powder briquettes based on iron. Such parameters are the outer greasing, which reduces friction between a green compact and the walls of the press tool matrix, and the firing, which removes the deformation strengthening of the green compacts and increases their plasticity. The green compacts’ sealing mechanism involved in the final squeezing process has been established, which is associated with the grinding of pre-compressed particles due to the strain in the contact areas. The increase in the stressed state of green compacts following the final squeezing was confirmed by the results of studying the residual micro-strains. The change in the stressed state of iron green compacts has been confirmed by the study into the structurally sensitive characteristics, which include the materials’ magnetic and electrical properties. Determining the magnetic characteristics has shown that final squeezing leads to an increase in coercive force, which can be explained by both the increase in the stressed state and the grinding of grains. Investigating the impact exerted by the annealing environment on the value of magnetic characteristics has demonstrated that annealing in hydrogen is more effective in terms of improving magnetic properties than annealing in a vacuum. This is due to the refining of grain boundaries through the processes of reduction of oxide films. The study of the mechanical characteristics of green compact materials based on iron powder has established that final squeezing leads to an increase in the hardness and strength of materials depending on the conditions of deformation. A significant improvement in the green compacts’ strength (820‒824 MPa) is due to both a decrease in porosity by 8‒10 % and an increase in the contact area as a result of plastic deformation after the annealing

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