A free-standing, self-healing multi-stimuli responsive gel showing cryogenic magnetic cooling

2020 ◽  
Vol 49 (38) ◽  
pp. 13487-13495
Author(s):  
Amit Adhikary ◽  
Krishna Sundar Das ◽  
Sayan Saha ◽  
Manasi Roy ◽  
Raju Mondal
Keyword(s):  
Magnetocaloric Effect ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Free Standing ◽  
Magnetic Cooling

A novel Fe(iii)-based gel was synthesized where reported gel would be the first reported metallogel showing magnetocaloric effect. The metallogel also revealed outstanding colourimetric NH3 sensing with unique gel-to-gel transformation.

Magnetocaloric and other Properties of Cold Rolled Gd Ribbons

2013 ◽  
Vol 738-739 ◽  
pp. 441-445
Author(s):  
Sergey Taskaev ◽  
Vasiliy D. Buchelnikov ◽  
Anatoliy Pellenen ◽  
Dmitriy Bataev ◽  
Konstantin Skokov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Treatment Procedure ◽  
Magnetic Cooling ◽  
Cooling Devices ◽  
Cold Rolled ◽  
Heat Treatment Procedure

In this work we investigate magnetocaloric effect and heat capacity of Gd cold rolled ribbons. Such materials are easy to produce, they are flexible and convenient for using in magnetic cooling devices. It is shown that the magnetocaloric effect is strongly dependent on thickness of the ribbons. Severely rolled ribbons demonstrate rather a small magnetocaloric effect. However, a special heat treatment procedure makes it possible to enhance the effect up to the value observed in polycrystalline Gd.

scholarly journals Magnetocaloric Effect in Nanosystems Based on Ferromagnets with Different Curie Temperatures

2021 ◽  
Vol 132 (1) ◽  
pp. 79-93
Author(s):  
M. A. Kuznetsov ◽  
A. B. Drovosekov ◽  
A. A. Fraerman
Keyword(s):  
Field Theory ◽  
Magnetocaloric Effect ◽  
Landau Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Maxwell Relation ◽  
Magnetic Cooling ◽  
The Mean ◽  
Curie Temperatures ◽  
Good Agreement

Abstract The magnetocaloric effect in nanosystems based on exchange-coupled ferromagnets with different Curie temperatures is calculated within the mean-field theory. Good agreement between the results of the mean-field theory and the Landau theory, valid near the critical phase transition temperature, is demonstrated for a flat-layered Fe/Gd/Fe structure. We show that a high magnetic cooling efficiency in this system is attainable in principle and prove the validity of the Maxwell relation, enabling an experimental verification of the predictions made. The theory developed for flat-layered structures is generalized to a granular medium.

scholarly journals Aqueous interfacial gels assembled from small molecule supramolecular polymers

2017 ◽  
Vol 8 (2) ◽  
pp. 1350-1355 ◽  
Author(s):  
Alexander S. Groombridge ◽  
Aniello Palma ◽  
Richard M. Parker ◽  
Chris Abell ◽  
Oren A. Scherman
Keyword(s):  
Small Molecules ◽  
Small Molecule ◽  
Self Assembly ◽  
Hyperbranched Polymer ◽  
Soft Matter ◽  
Supramolecular Polymers ◽  
Supramolecular Network ◽  
Self Healing ◽  
Liquid Interfaces ◽  
Stimuli Responsive

The successful self-assembly of a stimuli-responsive aqueous supramolecular hyperbranched polymer from small molecules and the macrocyclic host cucurbit[8]uril (CB[8]) is reported. This self-healing supramolecular network can act as a soft matter barrier at liquid–liquid interfaces.

The Influence of Cold Rolling on Magnetocaloric Properties of Gd100-xYx (x = 0, 5, 10, 15) Alloys

2015 ◽  
Vol 233-234 ◽  
pp. 238-242 ◽  
Author(s):  
Sergey Taskaev ◽  
Konstantin Skokov ◽  
Dmitriy Karpenkov ◽  
Vladimir V. Khovaylo ◽  
Vasiliy D. Buchelnikov ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Magnetocaloric Effect ◽  
High Temperature Heat Treatment ◽  
Magnetic Cooling ◽  
A Value ◽  
Magnetocaloric Properties ◽  
Cooling Devices ◽  
Cold Rolled ◽  
Magnetocaloric Materials ◽  
Temperature Heat Treatment

In this work we report the results of investigation of the magnetocaloric effect in Gd100-xYx (x= 0, 5, 10, 15) cold rolled ribbons. It is shown that the magnetocaloric effect exists within a wide temperature interval 258-295 K and it is comparable with the magnetocaloric effect observed in bulk samples of pure gadolinium. The value of the magnetocaloric effect in the rolled samples is reduced in comparison with the bulk samples and strongly depends on a degree of plastic deformation. High temperature heat treatment can restore a value of the magnetocaloric effect in the cold rolled ribbons up to initial ones. Thus, cold rolling is proposed to be a promising technique for producing thin forms of magnetocaloric materials for heat exchangers of magnetic cooling devices.

Bulk Transition Elements Based Materials for Magnetic Cooling Application

2011 ◽  
Vol 170 ◽  
pp. 248-252 ◽  
Author(s):  
Mohamed Balli ◽  
Osmann Sari ◽  
L. Zamni ◽  
A. Robert ◽  
J. Forchelet ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Composite Material ◽  
Powder Metallurgy ◽  
Magnetocaloric Effect ◽  
Temperature Change ◽  
Room Temperature ◽  
Test Bench ◽  
Transition Elements ◽  
Magnetic Systems ◽  
Magnetic Cooling

In this paper we investigate the performances of two bulk magnetocaloric refrigerants based on La(Fe,Co)13-xSix and prepared by powder metallurgy. Both materials were developed especially for a magnetic cooling machine. We have determined the magnetocaloric effect in term of temperature change under magnetic field using a test-bench with practical running conditions. ΔT was measured under 2 T and close to room temperature range. The obtained results will be compared with those of some reference materials reported in the literature. In addition, a composite material based on La(Fe,Co)13-xSix is proposed for magnetic systems using Ericsson and AMR cycles for refrigeration close to room temperature.

scholarly journals Chemical and photochemical DNA “gears” reversibly control stiffness, shape-memory, self-healing and controlled release properties of polyacrylamide hydrogels

2019 ◽  
Vol 10 (4) ◽  
pp. 1008-1016 ◽  
Author(s):  
Xia Liu ◽  
Junji Zhang ◽  
Michael Fadeev ◽  
Ziyuan Li ◽  
Verena Wulf ◽  
...  
Keyword(s):  
Controlled Release ◽  
Shape Memory ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Polyacrylamide Hydrogels

Stimuli-responsive polyacrylamide hydrogels crosslinked by glucosamine–boronate/G-quadruplexes or azobenzene-functionalized DNA reveal controlled stiffness using chemical or photochemical triggers.

Multi-stimuli responsive free-standing films of DR1- grafted silicones

2020 ◽  
Vol 401 ◽  
pp. 126087
Author(s):  
Carmen Racles ◽  
Cristian Ursu ◽  
Mihaela Dascalu ◽  
Mihai Asandulesa ◽  
Vasile Tiron ◽  
...  
Keyword(s):  
Stimuli Responsive ◽  
Free Standing

Facile access to versatile hydrogels via interface-directed frontal polymerization derived from the magnetocaloric effect

2015 ◽  
Vol 3 (33) ◽  
pp. 17351-17358 ◽  
Author(s):  
Chao Yu ◽  
Cai-Feng Wang ◽  
Su Chen
Keyword(s):  
Magnetocaloric Effect ◽  
Frontal Polymerization ◽  
Self Healing ◽  
Synthetic Pathway ◽  
Shape Changes

An interface-directed synthetic pathway is employed to offer a tractable preparation of versatile hydrogels in minutes. The resultant hydrogels show pH, thermal, electrically and chemically responsive shape changes as well as adjustable self-healing capacity.

A Stimuli-Responsive Supramolecular Hydrogel for Controlled Release of Drug

2017 ◽  
Vol 05 (03) ◽  
pp. 1750011 ◽  
Author(s):  
Subharanjan Biswas ◽  
Lakshmi Priya Datta ◽  
Soumyajit Roy
Keyword(s):  
Hydrogen Bonding ◽  
Controlled Release ◽  
Polyacrylic Acid ◽  
Dynamic Equilibrium ◽  
Guanidine Hydrochloride ◽  
Environmentally Benign ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Interconnected Network ◽  
Supramolecular Hydrogel

An inexpensive, facile, and environmentally benign method has been developed for the preparation of stimuli-responsive and self-healing polyacrylic acid–chitosan-based supramolecular hydrogels. Guanidine hydrochloride is used as the supramolecular crosslinker to form an interconnected network with polyacrylic acid–chitosan complex. Because of the dynamic equilibrium between the hydrogen-bonding sites of the components, the hydrogels were found to be self-healable and sensitive to biochemical-stimulus, such as pH. Controlled loading of drug like doxorubicin and its significant anticancer activity of such hydrogels is worth mentioning.

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