scholarly journals Magnetic composite biomaterials for tissue engineering

2014 ◽  
Vol 2 (6) ◽  
pp. 812-818 ◽  
Author(s):  
Sara Gil ◽  
João F. Mano
Keyword(s):  
Tissue Engineering ◽  
Magnetic Particles ◽  
Magnetic Composite ◽  
Composite Biomaterials

We overview the latest developments of polymeric/ceramic scaffolds and hydrogels that contain magnetic particles for the improvement of tissue engineering strategies.

Core-Shell Structured Fe3O4/PPy Microspheres with High Magnetization for Purification of Plasmid DNA

2013 ◽  
Vol 716 ◽  
pp. 314-319 ◽  
Author(s):  
Hai Hui Jiang ◽  
Yan Zhou ◽  
Xiao Yun Han ◽  
Xin Cheng Chen ◽  
Yun Hua Hou ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Drug Delivery ◽  
Plasmid Dna ◽  
Magnetic Particles ◽  
Interfacial Polymerization ◽  
Core Shell ◽  
Magnetic Composite ◽  
Amino Group ◽  
High Quality ◽  
E Coli

Amino group-functionalized magnetic particles have wide applications in enzyme immobilization, DNA extraction, drug delivery, water purification, catalysis, and sensor. In this paper, Fe3O4/PPy microspheres with a well-defined coreshell structure have been prepared through an interfacial polymerization approach without surfactant. The magnetic composite spheres were characterized with XRD, FTIR, SEM, TEM, and magnetometry techniques, and further tested as the adsorbent to isolate plasmid DNA from Escherichia coli (E. coli) DH5α cells. The magnetic separation yields high-quality plasmid DNA in satisfying productivity as compared to the conventional phenolchloroform extraction.

Synthesis of Loaded Silver 4A Zeolite Molecular Sieve with Magnetic Cores of SiO2/(γ-Fe2O3- SiO2) for Demercuration

2014 ◽  
Vol 881-883 ◽  
pp. 1144-1148
Author(s):  
Yue Qin Qiu ◽  
Lei Jia
Keyword(s):  
Key Words ◽  
Molecular Sieve ◽  
Absorption Rate ◽  
Magnetic Particles ◽  
Composite Particles ◽  
Magnetic Composite ◽  
Effective Solution ◽  
The Core ◽  
Magnetic Cores ◽  
4A Zeolite

It is an effective solution to the problem of agglomeration using the magnetic composite SiO2/(γ-Fe2O3- SiO2) instead of traditional magnetic particles Fe3O4as the core of molecular sieve. The traditional hydrothermal method was utilized by means of adding the magnetic composite particles SiO2/(γ-Fe2O3- SiO2) into the pre-made crystallization liquid. Then, a series of magnetic 4A zeolites with varying contents of SiO2/(γ-Fe2O3- SiO2) were synthesized under the condition of ultrasonic crystallization for 6 hours with the power of 100W and temperature of 70 °C . Afterwards, the characterization tests such as XRD,SEM,TG,IR were carried out; the final result showed that the performance of 4A zeolite molecular sieve with SiO2/(γ-Fe2O3- SiO2) is basically identical with the pure 4A zeolite molecular sieve. The absorption rate was 13.5927μg/g by using the 4A zeolite molecular sieve with SiO2/(γ-Fe2O3- SiO2) for the absorption of mercury. Key words: 4A zeolite molecular sieve; magnetic composite; silver loaded;Demercuration

Degradation of MTBE by Using a Novel Magnetic Composite TiO2/Fe3O4 Photoreactor Design

2009 ◽  
Vol 79-82 ◽  
pp. 321-324 ◽  
Author(s):  
Chih Hsiu Shen ◽  
Shang Lien Lo ◽  
Chen Yu Chang
Keyword(s):  
Photocatalytic Degradation ◽  
Environmental Protection Agency ◽  
Magnetic Particles ◽  
Water Solubility ◽  
Sol Gel ◽  
Methyl Tert Butyl Ether ◽  
Magnetic Composite ◽  
Recycled Water ◽  
Butyl Ether ◽  
Simple Method

Methyl tert-butyl ether (MTBE) is the most prevalent contaminant found in soil and groundwater and classified as a suspect carcinogen by Environmental Protection Agency (USEPA). Due to high water solubility, MTBE is not easy to be removed from contaminated groundwater. This study aimed to develop a novel and simple method to coat TiO2 photocatalyst on magnetic particles, evaluate its photocatalytic degradation effect on MTBE irradiated under visible (λ= 419 nm), and recollect easily from hydroponic systems with magnet. Iron nanoparticles are synthesized and added to TiO2 sol-gel followed by 500 oC calcinations. The results showed that the novel magnetic composite TiO2/Fe3O4 had significantly efficiency of photocatalytic degradation (91.6 %) for 10 ppm of MTBE under visible light irradiation and the recovery rate was relatively high as we recollected easily from recycled water using magnet.

Microwave Absorbing Properties of Polymer Composites Containing High-Permeability Magnetic Flake Particles in Quasi-Microwave Frequency Band

2013 ◽  
Vol 646 ◽  
pp. 14-17 ◽  
Author(s):  
Sung Soo Kim
Keyword(s):  
Frequency Band ◽  
Magnetic Permeability ◽  
Magnetic Particles ◽  
Impedance Matching ◽  
Microwave Frequency ◽  
Rubber Matrix ◽  
Al Alloy ◽  
Magnetic Composite ◽  
Microwave Absorbing Properties ◽  
Microwave Absorbing

This study investigates high-frequency magnetic, dielectric, and microwave absorbing properties of Sendust (Fe-Si-Al alloy) flake particles dispersed in rubber matrix for the design of thin microwave absorbers in quasi-microwave frequency band. At high particle loading (92% in weight) in the magnetic composite, reflection loss of -9 dB was obtained at 2 GHz with a small thickness of 1 mm. The result is attributed to the high values of magnetic permeability and dielectric constant of the composites resulting from a low eddy current loss (increase of permeability) of the flake particles and enhancement of space charge polarization (increase of permittivity) between the metallic particles. However, the investigation of impedance matching reveals that the magnetic permeability is still small to satisfy the zero-reflected condition at the quasi-microwave frequency band of 1-2 GHz with a composite thickness smaller than 1 mm. It is suggested that greater magnetic permeability (by control of composition and shape of magnetic particles) is required for more improved microwave absorbance at a quasi-microwave frequency.

Green Magnetic Composite Sheet from Durian Shell and Nano-Magnetite Particles

2015 ◽  
Vol 761 ◽  
pp. 515-519 ◽  
Author(s):  
Mohd Khairul Shahril ◽  
Rose Farahiyan Munawar ◽  
Muhd Hafez Mohamed ◽  
Afraha Baiti Arif ◽  
Noraiham Mohamad ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Added Value ◽  
Precipitation Method ◽  
Magnetic Composite ◽  
Great Success ◽  
Composite Sheet ◽  
Biomass Waste ◽  
Co Precipitation

Biomass-derived materials such as kenaf pulp and wood chips are a perfect candidate to produce magnetic paper. Furthermore, by using biomass waste, such as paddy straw, sugarcane, bagasse and durian shell, the cost of producing magnetic paper can be further reduced while giving added value to the waste. This paper investigates the potential of producing magnetic sheet from durian shell. Initially, durian shells were dried before undergoing the pulping process. The resulted sheet was then combined with magnetic particles, the nanomagnetite using either lumen loading or in-situ co-precipitation to produce a magnetic composite sheet. After being loaded with magnetic particles, the composite sheets were tested in terms of the homogeneity of the magnetic particles in the samples, degree of loading of the magnetic particles and the magnetic properties of the samples. Results obtained show a great success in producing the magnetic sheet from durian shell waste and nanomagnetite particles. It was also found that the lumen loading method gives better magnetic properties compared to the in-situ co-precipitation method.

scholarly journals Enhancing the Low-Frequency Induction Heating Effect of Magnetic Composites for Medical Applications

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 386 ◽  
Author(s):  
Ziyin Xiang ◽  
Khao-Iam Jakkpat ◽  
Benjamin Ducharne ◽  
Jean-Fabien Capsal ◽  
Jean-François Mogniotte ◽  
...  
Keyword(s):  
Induction Heating ◽  
Magnetic Particles ◽  
Varicose Veins ◽  
Local Heating ◽  
Low Frequency ◽  
Experimental Tests ◽  
Medical Applications ◽  
Magnetic Composite ◽  
Magnetic Composites ◽  
Frequency Excitation

This study aims to enhance the low-frequency induction heating (LFIH) effect in a thermoplastic polymer doped with iron oxide magnetic particles, which are promising candidates for several medical applications thanks to their confirmed biocompatibility. Two main approaches were proposed to successfully boost the heating ability; i.e., improving the magnetic concentration of the composite with higher filler content of 30 wt %, and doubling the frequency excitation after optimization of the inductor design. To test the magnetic properties of the ferromagnetic composite, a measurement of permeability as a function of temperature, frequency, and particle content was carried out. Thermal transfer based COMSOL simulations together with experimental tests have been performed, demonstrating feasibility of the proposed approach to significantly enhance the target temperature in a magnetic composite. These results are encouraging and confirmed that IH can be exploited in medical applications, especially for the treatment of varicose veins where local heating remains a true challenge.

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