Superabsorbent Polymer with High Swelling Ratio, and Temperature-Sensitive and Magnetic Properties Employed as an Efficient Dewatering Medium of Fine Coal

2017 ◽  
Vol 31 (2) ◽  
pp. 1825-1831 ◽  
Author(s):  
Suhong Zhang ◽  
Hangchao Chen ◽  
Shengyu Liu ◽  
Jianying Guo
Keyword(s):  
Magnetic Properties ◽  
Temperature Sensitive ◽  
Superabsorbent Polymer ◽  
Swelling Ratio ◽  
Fine Coal

FeNbVB ALLOY PARTICLES SUSPENDED IN LIQUID GALLIUM: INVESTIGATING THE MAGNETIC PROPERTIES OF THE MR SUSPENSION

2011 ◽  
Vol 25 (07) ◽  
pp. 947-955 ◽  
Author(s):  
GJERGJ DODBIBA ◽  
KENJI ONO ◽  
HYUN SEO PARK ◽  
SEIJI MATSUO ◽  
TOYOHISA FUJITA
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Iron Alloy ◽  
Testing Temperature ◽  
Liquid Gallium ◽  
Temperature Sensitive ◽  
Prepared Powder ◽  
Alloy Particles ◽  
The Magnetic Field

A MR suspension was prepared by dispersing silica-coated iron alloy particles into a liquid gallium. In other words, the iron alloy particles of 30 to 50 nm in diameter were first prepared and then coated with silica. Next, the particles were then suspended in a liquid Ga (assay: 99.9999%). In addition, the magnetic properties of the synthesized particles and suspension under the influence of the magnetic field were investigated. One of the main findings of this study is that the prepared powder showed a temperature sensitive of magnetization within the testing temperature range of 293–353 K. The saturation magnetization of silica-coated FeNbVB particles was about 0.55 T, whereas the saturation magnetization (297 K) of the synthesized MR suspension was 0.019 T.

Development of Stress and Temperature Sensitive Microwires for the Sensor Applications and Tuneable Composite Materials

2008 ◽  
Vol 54 ◽  
pp. 180-186
Author(s):  
Arkadi Zhukov ◽  
V. Zhukova ◽  
J. Gonzalez ◽  
Larissa V. Panina ◽  
J.M. Blanco
Keyword(s):  
Magnetic Properties ◽  
Composite Materials ◽  
High Performance ◽  
Hysteresis Loops ◽  
Transverse Magnetic ◽  
Temperature Sensitive ◽  
Sensor Applications ◽  
Gmi Effect ◽  
Annealing Conditions ◽  
Selection Of

We report on tailoring magnetic properties and giant magneto-impedance GMI in glasscoated microwires fabricated by the Taylor-Ulitovsky method, by means of selection of their alloy composition and/or annealing conditions. Fe-rich microwires subjected to stress annealing show the hysteresis loops of inclined form due to induced transverse magnetic anisotropy, and hence become suitable for GMI. The transverse anisotropy depends on the annealing conditions: temperature, duration and stress. The application of external stress further drastically changes the shape of the hysteresis loops and the GMI spectra. The wires with compositions Co-Fe-Ni-Si-B and Co-Fe-Cr- Si-B are demonstrated to have a low Curie temperature (below 90oC) and pronounced temperaturedependent magnetic properties and GMI effect. Both families of developed microwires are foreseen for applications in high performance stress and temperature sensors as well as in tuneable sensory composite materials. Such composites contain short pieces of microwires embedded into a dielectric matrix and contribute to the effective ac permittivity. The latter depends on the wire magnetic properties through the GMI effect and can be tailored to produce a microwave response sensitive to environment: magnetic field, stress and temperature.

scholarly journals One-Shot Preparation of Polybasic Ternary Hybrid Cryogels Consisting of Halloysite Nanotubes and Tertiary Amine Functional Groups: An Efficient and Convenient Way by Freezing-Induced Gelation

Gels ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 16
Author(s):  
Nur Sena Okten Besli ◽  
Nermin Orakdogen
Keyword(s):  
Functional Groups ◽  
Tertiary Amine ◽  
Current System ◽  
Halloysite Nanotubes ◽  
Mechanical Tests ◽  
Significant Loss ◽  
Temperature Sensitive ◽  
Positive Temperature ◽  
Swelling Ratio ◽  
Hybrid Gels

A convenient method for the preparation of polybasic ternary hybrid cryogels consisting of Halloysite nanotubes (HNTs) and tertiary amine functional groups by freezing-induced gelation is proposed. Ternary hybrid gels were produced via one-shot radical terpolymerization of 2-hydroxyethyl methacrylate (HEMA), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), and DEAEMA in the presence of HNTs. The equilibrium swelling in various swelling media and the mechanical properties of the produced ternary hybrid gels were analyzed to investigate their network structure and determine their final performance. The swelling ratio of HNT-free gels was significantly higher than the ternary hybrid gels composed of high amount of HNTs. The addition of HNTs to terpolymer network did not suppress pH- and temperature-sensitive behavior. While DEAEMA groups were effective for pH-sensitive swelling, it was determined that both HEMA and DEAEMA groups were effective in temperature-sensitive swelling. Ternary hybrid gels simultaneously demonstrated both negative and positive temperature-responsive swelling behavior. The swelling ratio changed considerably according to swelling temperature. Both DEAEMA and HEMA monomers in terpolymer structure were dominant in temperature-sensitive swelling. Mechanical tests in compression of both as-prepared and swollen-state demonstrated that strength and modulus of hybrid cryogels significantly increased with addition of HNTs without significant loss of mechanical strength. Ultimately, the results of the current system can benefit characterization with analysis tools for the application of innovative materials.

Water-Swelling Rubber Containing Small Amount of Nanofillers with Enhanced Water Swelling Durability

2013 ◽  
Vol 774-776 ◽  
pp. 544-547
Author(s):  
Wei Han ◽  
You Hong Tang
Keyword(s):  
Room Temperature ◽  
Superabsorbent Polymer ◽  
Swelling Ratio ◽  
Loss Ratio ◽  
Degree Of Swelling ◽  
Equilibrium Swelling ◽  
Mechanical Behaviours ◽  
Equilibrium Swelling Ratio ◽  
Water Swelling ◽  
Weight Loss Ratio

A series of water-swelling rubbers (WSR) were prepared by directly mixing room temperature vulcanization-2 components silicone rubber (RTV-2 SR) with superabsorbent polymer (SAP) and nanofiller (s) (halloysite nanotube or/and CaCO3). The effects of component on its mechanical behaviours and water-absorbent properties such as degree of swelling, swelling ratio, and weight loss ratio were investigated. The equilibrium swelling ratio increased with increasing amounts of water-absorbent resin. Well-dispersed nanofiller (s) increased the mechanical properties of WSR and prevented SAP breaking off from the elastomer network to effectively enhance the water-swelling durability of WSR.

Temperature-Sensitive Hybrid Microgels with Magnetic Properties

Langmuir ◽  
2004 ◽  
Vol 20 (24) ◽  
pp. 10706-10711 ◽  
Author(s):  
Andrij Pich ◽  
Sanchita Bhattacharya ◽  
Yan Lu ◽  
Volodymyr Boyko ◽  
Hans-Juergen P. Adler
Keyword(s):  
Magnetic Properties ◽  
Temperature Sensitive ◽  
Hybrid Microgels

scholarly journals Structure and magnetic properties of coprecipitated nickel-zinc ferrite doped rare earth elements of Sc, Dy, and Gd

2021 ◽  
Author(s):  
Li Shiwen ◽  
Pan Jiatong ◽  
Gao Feng ◽  
Zeng Deqian ◽  
Feng Qin ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Physical Property Measurement System ◽  
Rare Earth Ions ◽  
Temperature Sensitive ◽  
Basic Study ◽  
Nickel Zinc ◽  
Average Grain Size

Abstract This research is the basic study of temperature-sensitive ferrite characteristics prepared by coprecipitation with doping different typical sizes of rare earth elements. Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 (NZRF) (X = 0.02, 0.05, 0.07 and 0.09) nanoparticles (NPs) doped by Sc, Dy and Gd prepared by chemical coprecipitation method. The structure and properties of Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 were analyzed by various characterization methods. XRD results show that the grain size of Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 is from 10.6 to 12.4 nm, which is close to the average grain size of 13.9 nm observed on TEM images. It is also found that the ferrite particles are spherical and slightly agglomerated in TEM images. FTIR measurements between 400 and 4000 cm -1 have confirmed the intrinsic cation vibration of the spinel structure. The concentrations of nickel, zinc, iron, and rare earth elements have been determined by ICP-AES, and all ions have participated in the reaction. The magnetic properties of Sc, Dy, and Gd 3+ doped NZRF NPs at room temperature are recorded by a physical property measurement system (PPMS-9). It is found that the magnetization can be changed by adding rare-earth ions. When X = 0.07, Gd 3+ doped Ni 0.5 Zn 0.5 Fe 2 O 4 (NZF) exhibits the highest saturation magnetization. The magnetic properties of NZGd 0.07 vary the most with temperature. The thermomagnetic coefficient of NZGd 0.07 nanoparticles stabilized to 0.18 emu/gK at 0-100℃. Hence, NZGd 0.07 with low Curie temperature and the high thermomagnetic coefficient can be used to prepare temperature-sensitive ferrofluid. All the samples exhibit very small coercivity and almost zero remanences, which indicates the superparamagnetism of the synthesized nanoparticles.

scholarly journals In Situ Synthesis of a Silver-Containing Superabsorbent Polymer via a Greener Method Based on Carboxymethyl Celluloses

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2483 ◽  
Author(s):  
Jie Shen ◽  
Chang Cui ◽  
Jian Li ◽  
Lijuan Wang
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Acrylic Acid ◽  
Silver Nitrate ◽  
Photoelectron Spectroscopy ◽  
Three Dimensional ◽  
Antibacterial Properties ◽  
Superabsorbent Polymer ◽  
Swelling Ratio ◽  
Silver Particles

An antibacterial superabsorbent polymer (SAP) was synthesized by grafting acrylic acid (AA) onto carboxymethyl cellulose (CMC) and mixing with silver particles, with N,N′-methylenebisacrylamide used as a crosslinker and potassium persulfate as an initiator. Silver nanoparticles were produced through the reaction between glucose and silver nitrate. The effects of the amount of silver nitrate added in the polymer on the swelling ratio were investigated and the maximum swelling ratio of the SAP loaded with silver particles in distilled water and in a 0.9 wt % NaCl solution reached 840 g/g and 71 g/g, respectively, when the silver nitrate added was 50 mg. The SAP was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, energy dispersive spectrometry, transmission electron microscopy, and thermogravimetric analysis. Through these analysis methods, it could be seen that the acrylic acid was successfully grafted onto CMC, forming a three-dimensional network structure, with the successful production of silver nanoparticles with sizes ranging from 5 nm to 50 nm. Moreover, the antibacterial properties of the SAP loaded with silver nanoparticles against Staphylococcus aureus and Escherichia coli were investigated and the results show that they became more effective with increasing silver nitrate concentration. The obtained SAP can be useful in developing new antibacterial medical and public health supplies.

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