Transition Metal Based Magneto Caloric Materials for Energy Efficient Heat Pumps

2016 ◽  
Vol 257 ◽  
pp. 129-134 ◽  
Author(s):  
Ekkes Brück ◽  
Hargen Yibole ◽  
Van Thang Nguyen ◽  
Xue Fei Miao ◽  
Maurits Boeije ◽  
...  
Keyword(s):  
Transition Metal ◽  
Real World ◽  
Energy Efficient ◽  
Room Temperature ◽  
Heat Pumps ◽  
Environmentally Benign ◽  
Ferromagnetic Transition ◽  
Metal Compounds ◽  
Real World Applications ◽  
Cooling Technology

Magnetic refrigeration near room temperature is considered as an environmentally benign alternative for the current compressor-based cooling technology. Two materials that are based on ferromagnetic transition metal compounds are considered as the most promising candidates to be used in real world applications. Here we discuss the main features of these materials.

scholarly journals Electronic Phenomena of Transition Metal Oxides

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 256
Author(s):  
Christian Rodenbücher ◽  
Kristof Szot
Keyword(s):  
Solid State ◽  
Transition Metal ◽  
Metal Oxides ◽  
Real World ◽  
Transition Metal Oxides ◽  
Major Research ◽  
Research Fields ◽  
Real World Applications

Transition metal oxides with ABO3 or BO2 structures have become one of the major research fields in solid state science, as they exhibit an impressive variety of unusual and exotic phenomena with potential for their exploitation in real-world applications [...]

Flexible, low-cost and scalable, nanostructured conductive paper-based, efficient hygroelectric generator

2021 ◽  
Author(s):  
Kelly S. Moreira ◽  
Diana Lermen ◽  
Leandra P. dos Santos ◽  
Fernando Galembeck ◽  
Thiago A. L. Burgo
Keyword(s):  
Real World ◽  
Energy Efficient ◽  
Low Cost ◽  
Electrical Energy ◽  
Conductive Paper ◽  
Real World Applications

Converting humidity into useful electrical energy was only recently demonstrated and the improvements presented in this work are not only highly energy efficient, but also contributes to the development of scalable, real-world applications.

An Efficient One Pot, Multicomponent Synthesis of 1, 3-Thiazolidin-4-Ones Using L-Proline as Catalyst in Water

2021 ◽  
Vol 18 ◽  
Author(s):  
Yatin U. Gadkari ◽  
Rajesh D. Shanbhag ◽  
Vikas N. Telvekar
Keyword(s):  
Energy Efficient ◽  
Room Temperature ◽  
Thioglycolic Acid ◽  
Current Approach ◽  
Environmentally Benign ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
The One ◽  
Aqueous Conditions ◽  
Aromatic Heterocyclic

: An efficient methodology for the synthesis of 1,3-thiazolidin-4-ones using L-Proline as catalyst under aqueous conditions has been developed. The one-pot, multicomponent reaction of aromatic/heterocyclic aldehyde, aromatic amine and thioglycolic acid at room temperature give 1,3-thiazolidin-4-ones in moderate to good yields. Further, the current approach is notably greener than traditional methods with E-factor of 3.1 and the eco scale score of 96. The developed protocol offers several features, such as being simple, environmentally benign, energy-efficient, economical, mild conditions, shorter reaction time.

The Effect of Fe Substitutions on the Microstructure of Gd5Si2Ge2

2007 ◽  
Vol 1032 ◽  
Author(s):  
Benjamin Podmiljsak ◽  
Paul McGuiness ◽  
Spomenka Kobe ◽  
Irena Skulj
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Transmission Electron Microscope ◽  
Real World ◽  
Room Temperature ◽  
Microstructural Investigation ◽  
Transmission Electron ◽  
Real World Applications ◽  
Giant Magnetocaloric Effect ◽  
Scanning Electron

AbstractGd5Si2Ge2 exhibits the so-called giant magnetocaloric effect, making it a potential material for next-generation near-room-temperature permanent-magnet-based refrigeration devices. In the as-cast form this material is relatively complicated in terms of its structure and its metallurgy.Recent reports have suggested that small additions of iron can substantially improve the problems associated with hysteresis losses, so enhancing the material's potential for real-world applications. We have looked at iron substitutions in the range X=0 to X=1 for Gd5Si2-XGe2 to investigate the macrostructures and microstructures of cast and homogenized materials, with particular emphasis on the amount of iron substituting for silicon in the Gd5(SiGe)4 phase and the effect of the substituting iron on the Ge/Si ratio. The larger iron substitutions were found to eliminate the unusual macrostructures, and conventional ingots with smooth surfaces were the result. The iron was also found to dissolve at levels of 1-3% in the Gd5(SiGe)4 phase and encourage the formation of the Gd5(SiGe)3 phase at the expense of the magnetocaloric Gd5(SiGe)4 phase. A substitution of X=1 was found to be sufficient to produce as-cast microstructures consisting almost entirely of the Gd5(SiGe)3 phase.With a scanning electron microscope (Jeol 840A) and an analytical transmission electron microscope (Jeol 2010 F with a field-emission gun) and an EDXS system from Oxford Instruments (Link Isis 300) we performed a detailed microstructural investigation of the processed materials. Special emphasis was placed on the intergrain regions and an assessment of the amount of Fe substituting in the main magnetocaloric phase.

A Facile Synthesis of 2-Aminobenzoxazines Based on Iodine­Catalyzed Desulfurative Cyclization

Synthesis ◽  
2021 ◽  
Author(s):  
Shinji Tanimori ◽  
Asuka Fuchiya ◽  
Takuya Miyamura ◽  
Haruna Nariki ◽  
Shizuki Noda ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Transition Metal ◽  
Room Temperature ◽  
Catalytic Amount ◽  
Molecular Iodine ◽  
Environmentally Benign ◽  
Facile Synthesis ◽  
Metal Free ◽  
Catalytic Transformations

AbstractA facile and environmentally benign access to N-aryl/alkyl-4H-benzoxazin-2-amines is achieved from 1-[2-(hydroxymethyl)phenyl/alkyl]-3-phenylthioureas under transition-metal-free conditions. The conversions occur smoothly in the presence of a catalytic amount of molecular iodine and hydrogen peroxide as the oxidant in tetrahydrofuran at room temperature to afford moderate to good yields (28–90%) of the desired products within 2 hours. This method reports the first examples of the catalytic transformations of 1-[2-(hydroxymethyl)phenyl/alkyl]-3-phenylthioureas into N-aryl/alkyl-4H-benzoxazin-2-amines based on desulfurative cyclization.

scholarly journals Thermoelectricity in transition metal compounds: the role of spin disorder

2016 ◽  
Vol 18 (46) ◽  
pp. 31777-31786 ◽  
Author(s):  
Prashun Gorai ◽  
Eric S. Toberer ◽  
Vladan Stevanović
Keyword(s):  
Low Temperature ◽  
Transition Metal ◽  
Electronic Properties ◽  
Magnetic Materials ◽  
Room Temperature ◽  
Paramagnetic State ◽  
Transition Metal Compounds ◽  
Metal Compounds ◽  
Spin Disorder

At room temperature and above, most magnetic materials adopt a spin-disordered (paramagnetic) state whose electronic properties can differ significantly from their low-temperature, spin-ordered counterparts.

scholarly journals Room-Temperature Magneto-Optics of Ferromagnetic Transition-Metal-Doped ZnO Thin Films

2006 ◽  
Vol 96 (19) ◽  
Author(s):  
J. R. Neal ◽  
A. J. Behan ◽  
R. M. Ibrahim ◽  
H. J. Blythe ◽  
M. Ziese ◽  
...  
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Room Temperature ◽  
Zno Thin Films ◽  
Ferromagnetic Transition ◽  
Doped Zno ◽  
Metal Doped
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