Large magnetic permeability and resonant frequency of CoFe nanofilms electrodeposited via optimizing plating solution parameters based on electrochemistry mechanisms

2014 ◽  
Vol 1708 ◽  
Author(s):  
BaoYu Zong ◽  
YuPing Wu ◽  
Nguyen Nguyen Phuoc ◽  
Pin Ho ◽  
FuSheng Ma
Keyword(s):  
Resonant Frequency ◽  
Magnetic Permeability ◽  
Room Temperature ◽  
Chemical Properties ◽  
Microwave Properties ◽  
Additive Concentration ◽  
Salt Solutions ◽  
Physico Chemical ◽  
Plating Solution ◽  
Solution Parameters

ABSTRACTA simple methodology to electrodeposit thin soft CoFe films with desirable microwave properties from simple salt solutions at room temperature is demonstrated. Plating solution parameters have diverse influences on real potentials of ion reductions and deposition behavior of the FeCo crystals, consequently affecting largely the particle size, crystal structure and chemical composition of the film fabricated. This in turn determines their static magnetism and dynamic microwave properties. Through optimizing solution additive, concentration and temperature from electrodeposition mechanism, the as-prepared nanofilms possess a low coercivity of < 30 Oe, moderate anisotropy of 60-90 Oe, high crystallinity and magnetic moment of ≥ 2.0 T, and hence readily display an ultrahigh magnetic permeability (up to 1128) and resonant frequency (up to 2.1 gigahertz) simultaneously, as well as other desirable physico-chemical properties. Thus the nanofilms can be applied to high gigahertz frequency applications.

15N NMR studies provide insights into physico-chemical properties of room-temperature ionic liquids

2021 ◽  
Author(s):  
Christoph Wiedemann ◽  
David Fushman ◽  
Frank Bordusa
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Chemical Properties ◽  
Room Temperature Ionic Liquids ◽  
15N Nmr ◽  
Nmr Studies ◽  
Physico Chemical ◽  
Alternative Solvents

Ionic liquids (ILs) have gained a lot of attention as alternative solvents in many fields of science in the last two decades. It is known that the type of anion...

Physico-chemical properties and nanoscale morphology in N-alkyl-N-methylmorpholinium dicyanamide room temperature ionic liquids

2013 ◽  
Vol 187 ◽  
pp. 252-259 ◽  
Author(s):  
Olga Russina ◽  
Ruggero Caminiti ◽  
Alessandro Triolo ◽  
Sunita Rajamani ◽  
Bernardo Melai ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Chemical Properties ◽  
Room Temperature Ionic Liquids ◽  
Physico Chemical ◽  
Nanoscale Morphology

scholarly journals Synthesis and investigation of physico-chemical properties of dicationic ionic liquids

2018 ◽  
Vol 5 (12) ◽  
pp. 181230 ◽  
Author(s):  
Yi-Xin Sun ◽  
Ying-Ying Wang ◽  
Bing-Bing Shen ◽  
Bi-Xian Zhang ◽  
Xiao-Mei Hu
Keyword(s):  
Ionic Liquids ◽  
Heterogeneous System ◽  
Room Temperature ◽  
Chemical Properties ◽  
Homogeneous System ◽  
The Other ◽  
Melting Points ◽  
Good Solubility ◽  
Physico Chemical ◽  
Dicationic Ionic Liquids

A series of dicationic ionic liquids (ILs) including [C 4 (MIM) 2 ][PF 6 ] 2 , [C 5 (MIM) 2 ][PF 6 ] 2 , [C 6 (MIM) 2 ][PF 6 ] 2 and [C 4 (PYR) 2 ][PF 6 ] 2 were synthesized. Their thermal stability and melting points were analysed. It was found that dicationic ILs presented important implications in the design of homogeneous and heterogeneous system with water. A homogeneous system of dicationic ILs with water could be formed at a relatively high temperature and then a heterogeneous system was formed when the solution was cooled to a low temperature. The ILs recovered by altering the temperature were obtained in high percentage yields of [C 4 (MIM) 2 ][PF 6 ] 2 (97.6%), [C 5 (MIM) 2 ][PF 6 ] 2 (97.3%), [C 6 (MIM) 2 ][PF 6 ] 2 (98.0%) and [C 4 (PYR) 2 ][PF 6 ] 2 (94.2%). On the other hand, [C 4 (MIM) 2 ][PF 6 ] 2 and [C 5 (MIM) 2 ][PF 6 ] 2 exhibited good solubility in acetonitrile and acetone. A homogeneous system could be achieved with imidazolium-based ILs with a relatively low amount of water and acetonitrile at room temperature. All of the properties of dicationic ILs have a strong correlation with the nature of dications, the linkage chain and the symmetry of dications. Dicationic ILs may provide a new opportunity for some specific applications in order to enable the effective separation and isolation of products.

scholarly journals Effect of Packaging Materials on Storage Quality of Functional Beverage Mix

2021 ◽  
Vol 108 (March) ◽  
pp. 1-6
Author(s):  
Girija J ◽  
◽  
Kamalasundari S ◽  
Keyword(s):  
Polyethylene Terephthalate ◽  
Room Temperature ◽  
Finger Millet ◽  
Chemical Properties ◽  
Packaging Materials ◽  
Physico Chemical ◽  
Ginger Powder ◽  
Polyethylene Terephthalate Bottles ◽  
Green Banana

The present study aimed at development of finger millet-based functional beverage mix with 9% green banana flour and 1% ginger powder. The developed beverage mix was packed by using four different packaging materials i.e., low-density polyethylene (P1), standup pouch (P2), aluminium foil pouch (P3) and polyethylene terephthalate bottles (P4) and stored at room temperature. The changes in the physico-chemical, microbial quality were analyzed for 3 months (90 days). The results revealed that during storage, the moisture content was increased from 6.23 to 6.99%, whereas other chemical properties viz., carbohydrate (CHO), protein, fat, ash and dietary fiber were gradually decreased from 68.62 to 68.48, 15.09 to 14.99, 1.50 to 1.48, 3.74 to 3.73 and 2.78 to 2.77 respectively. There was no signifance change in calcium and phosphorus among the packaging materials during storage. The microbial load was low in P3 and P4 packed beverage mix during storage. The functional beverage mix packed in polyethylene terephthalate bottles was undergone minimum changes in physico-chemical characteristics. Hence, it is concluded that the storage of functional beverage mix in polyethylene terephthalate bottles extended the shelf life of the product and reduced the nutrient losses during storage.

scholarly journals Changes in the physico-chemical properties of spear and pepper mint volatile oils during storage

2019 ◽  
Author(s):  
Tamer Farouk Ahmed El-Moghazy
Keyword(s):  
Room Temperature ◽  
Steam Distillation ◽  
Chemical Properties ◽  
Volatile Oil ◽  
Research Station ◽  
Distillation Method ◽  
Volatile Oils ◽  
Physico Chemical ◽  
Starting Point ◽  
Horticultural Research

The experiment was conducted in Sabahia Horticultural Research Station, Alexandria, Egypt during the period from February 2005 until July 2007. Spear and pepper mint fields were planted late February and harvested in June 2005. The oil from the herbs was extracted by steam distillation method in a private factory in 6-October city. Then, the storage experiment was started in the middle of July 2005 and extended for two years.Dark and clear glasses, 25 ml, were filled with the oils to study the effects of the presence vs. absence of oxygen in the bottle atmosphere (half full vs. full filled bottles), dry oil vs. moisted oil (1% moisture), darkness vs. light (dark vs. clear glasses) and the effect of room temperature vs. low temperature (4oC) on the oils quality during storage. Each treatment was represented by 3 bottles, used once only in each sampling every three months for 9 times lasted for 24 months, June 2007, including the starting point samples. Storing either spear mint volatile oil or pepper mint volatile oil dry, away of air, in dark and placed in a refrigerator is recommended to keep the oils quality in good status. The active compounds will be remained in the acceptable levels and retard it far from spoilage for longer time, it might reach 24 months.

scholarly journals Concentrate development from Litchi Juice and quality evaluation during storage

2021 ◽  
Vol 2070 (1) ◽  
pp. 012072
Author(s):  
Jyoti Rani ◽  
Anil Shelke ◽  
Bharti Bansal ◽  
Vinay Gautam
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Quality Evaluation ◽  
Flow Behavior ◽  
Chemical Properties ◽  
Storage Period ◽  
Sensory Characteristics ◽  
Research Station ◽  
Flow Behavior Index ◽  
Physico Chemical

Abstract An attempt has been made to concentrate Litchi juice using fresh juice, using class-II preservatives via laboratory scale single stage single effect glass evaporator with vacuum in a batch. Two litchi varieties viz. Dehradun and Seedless late were procured from the Regional Fruit Research Station, Gangian (Distt. Hoshiarpur) and processing was done at Food Science and Technology department (Punjab Agricultural University, Ludhiana, Punjab) pilot-plant. The extraction of juice was attempted via screw-based juice extractor with subsequent muslin cloth filtration. The filtered juice was divided into two lots of which one was concentrated via evaporation while another was preserved using 2000 ppm potassium metabisulphite in glass bottles for later on concentration. The juice was concentrated at 50-55oC temperature with a vacuum of 27-30 inches of Hg. The final concentration of juice was maintained at 80 oBrix in all the cases. Product was packed in pearl pet jars and was stored at ambient room temperature (12-38 oC) (RT) and low temperature (LT) i.e., refrigerated (0-4oC) for 6 months periodic quality evaluation like physico-chemical because of storage. Stored product was analyzed at 0, 2, 4 and 6 months interval for various storage physico-chemical changes like TSS, pH, acidity, ascorbic acid, sugars, browning, pectin, viscosity, tannins and sensory quality. The result outcome proposed that seedless variety yield more juice, pulp and less seed in comparison to Dehradun variety while the sensory characteristics were found more acceptable in Dehradun variety rather than Seedless variety. Physico-chemical properties observed in concentrates from both litchi varieties doesn’t show much difference but a clear difference can be seen room temperature stored concentrate to low temperature stored concentrate. The flow behavior for the concentrates was found to be decreasing slightly with storage period as compared to controls. However, considerable decrease in flow behavior index was observed for the concentrates prepared from Dehradun variety stored at low temperature for 6 months to the seedless variety. The consistency index values has shown positive drift with extending storage time especially for those low temperature concentrates. So, it can be said concentrates from both varieties could be commercially produced with acceptable sensory characteristics.

scholarly journals Physico-Chemical Properties of NaV3O8 Prepared by Solid-State Reaction

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6976
Author(s):  
Mariya Shchelkanova ◽  
Georgiy Shekhtman ◽  
Svetlana Pershina ◽  
Emma Vovkotrub
Keyword(s):  
Solid State ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Chemical Properties ◽  
Solid State Method ◽  
X Ray ◽  
Synthesis Conditions ◽  
Optimum Synthesis ◽  
Physico Chemical ◽  
Galvanostatic Conditions

Sodium–vanadium oxide NaV3O8 is synthesized via solid-state method and optimum synthesis conditions are chosen based on the data of DSC and TG analysis. The material synthesized is characterized by X-ray phase analysis, Raman spectroscopy and scanning electron microscopy. The ratio V4+/V5+ in the sample obtained is determined by X-ray photoelectron spectroscopy. Conductivity of the material synthesized was measured by impedance spectroscopy, pulse potentiometry and DC method over the range RT–570 °C. It is shown that NaV3O8 has rather high conductivity essentially electron in type (6.3 × 10−2 at room temperature). AC and DC conductivity measurements are performed and cycling of symmetricNaV3O8|Na3.85Zr1.85Nb0.15Si3O12|NaV3O8 cell in galvanostatic conditions. Thermal stability is studied across 25–570 °C temperature range. The results obtained are compared with the properties of NaV3O8 produced via aqueous solution.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

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