Superparamagnetic Nanoparticles with Mesoporous Structure Prepared through Hydrothermal Technique

2020 ◽  
Vol 1000 ◽  
pp. 203-209
Author(s):  
Ahmad Fadli ◽  
Amun Amri ◽  
Esty Octiana Sari ◽  
Sukoco Sukoco ◽  
Deden Saprudin
Keyword(s):  
Magnetite Nanoparticles ◽  
Sodium Citrate ◽  
Crystal Size ◽  
Mesoporous Structure ◽  
Superparamagnetic Nanoparticles ◽  
Synthesis Time ◽  
Magnetite Nanoparticle ◽  
Black Precipitate ◽  
Crystal Diameter ◽  
Superparamagnetic Properties

Magnetite nanoparticles have been successfully prepared by hydrothermal method from FeCl3 as starting material. The properties and morphology of the products with different synthesis time and FeCl3 concentration were investigated. Firstly, the FeCl3 with concentration of 0.05 – 0.15 M and 0.10 M sodium citrate as well as 0.15 M were mixed with distilled water containing 0.1 g polyethylene glycol. Subsequenly, the solution was transferred into a Teflon-lined autoclave and it heated into an oven at 210°C for 12 hours. The black precipitate that formed was separated by a bar magnet, then washed with water and ethanol, and dried at 60°C overnight. The magnetite formation begun at 3.5 hours synthesis time with crystal diameter in range of 9.4-30 nm. The crystallinity and crystal size of magnetite increased with reaction time and concentration of FeCl3. The magnetite nanoparticles had a mesoporous structure and bigger pores at higher concentration. The saturation magnetization (Ms) of magnetite was in the range of 59 – 81 Emu/g with coercivity value was near to zero showing that magnetite nanoparticle had superparamagnetic properties.

Functional Magnetite Nanoparticle: A Review on the Particles Lysis and Nucleic Acid Separation

2021 ◽  
Vol 33 ◽  
pp. 13-27
Author(s):  
Puspita Nurlilasari ◽  
Camellia Panatarani ◽  
Mia Miranti ◽  
Savira Ekawardhani ◽  
Ferry Faizal ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Magnetite Nanoparticles ◽  
Magnetic Beads ◽  
Functional Materials ◽  
Cell Lysis ◽  
Acid Extraction ◽  
Nucleic Acid Extraction ◽  
Coating Materials ◽  
Magnetite Nanoparticle ◽  
Separation Cell

The functional magnetite nanoparticles are one of the most important functional materials for nucleic acid separation. Cell lysis and magnetic separation are two essential steps involve in optimizing nucleic acid extraction using the magnetic beads method. Many coating materials, coupling agents, chemical cell lysis, and several methods have been proposed to produce the specific desired properties for nucleic acid extraction. The important properties, such as biocompatibility, stability, linking ability, hydrophobicity, and biodegradable, were considered. The appropriate coating material of magnetite core and coupling agent are necessary to give biomolecules a possibility to link with each other through chemical conjugation. In this review, progress in functional magnetite nanoparticles to optimize the high binding performance in nucleic acid extraction is discussed.

scholarly journals Process-Induced Nanostructures on Anatase Single Crystals via Pulsed-Pressure MOCVD

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1668 ◽  
Author(s):  
Rukmini Gorthy ◽  
Susan Krumdieck ◽  
Catherine Bishop
Keyword(s):  
Metalorganic Chemical Vapor Deposition ◽  
Crystal Size ◽  
Chemical Vapor ◽  
Competitive Growth ◽  
Promising Candidate ◽  
Columnar Crystal ◽  
Practical Applications ◽  
Global Pandemic ◽  
Crystal Diameter ◽  
Plate Width

The recent global pandemic of COVID-19 highlights the urgent need for practical applications of anti-microbial coatings on touch-surfaces. Nanostructured TiO2 is a promising candidate for the passive reduction of transmission when applied to handles, push-plates and switches in hospitals. Here we report control of the nanostructure dimension of the mille-feuille crystal plates in anatase columnar crystals as a function of the coating thickness. This nanoplate thickness is key to achieving the large aspect ratio of surface area to migration path length. TiO2 solid coatings were prepared by pulsed-pressure metalorganic chemical vapor deposition (pp-MOCVD) under the same deposition temperature and mass flux, with thickness ranging from 1.3–16 μm, by varying the number of precursor pulses. SEM and STEM were used to measure the mille-feuille plate width which is believed to be a key functional nano-dimension for photocatalytic activity. Competitive growth produces a larger columnar crystal diameter with thickness. The question is if the nano-dimension also increases with columnar crystal size. We report that the nano-dimension increases with the film thickness, ranging from 17–42 nm. The results of this study can be used to design a coating which has co-optimized thickness for durability and nano-dimension for enhanced photocatalytic properties.

White-light-emitting magnetite nanoparticle–polymer composites: photonic reactions of magnetic multi-granule nanoclusters as photothermal agents

Nanoscale ◽  
2016 ◽  
Vol 8 (39) ◽  
pp. 17136-17140 ◽  
Author(s):  
Yu Jin Kim ◽  
Bum Chul Park ◽  
June Park ◽  
Hee-Dae Kim ◽  
Nam Hoon Kim ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Laser Irradiation ◽  
White Light ◽  
Magnetite Nanoparticles ◽  
Light Emission ◽  
White Light Emission ◽  
Magnetite Nanoparticle ◽  
Light Emitting

Magnetite nanoparticles combined with polymers produce white-light emission under multiphoton laser irradiation.

Assessment on the Release of Magnetite Nanoparticles Embedded with PVA Nanofiber in Hydrodynamics

2016 ◽  
Vol 41 ◽  
pp. 31-41
Author(s):  
Vikram Srinivas ◽  
Vasanthakumari Raju
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Polyvinyl Alcohol ◽  
Magnetite Nanoparticles ◽  
Average Diameter ◽  
Spectroscopic Technique ◽  
Release Mechanism ◽  
Static Mode ◽  
Magnetite Nanoparticle ◽  
Polymer Nanofiber

Magnetite nanoparticle with average size 7-10 nm was embedded with biocompatible polyvinyl alcohol nanofiber and the average diameter of nanofiber is 115 nm. The nanofiber was further assembled over polymeric mesh to analyse the release mechanism of nanoparticles from polymer nanofiber. A hydrodynamics setup was constructed to study this system. Prior to hydrodynamics the nanofiber was allowed to react with water in static mode and observed that the magnetite nanoparticles were released from the nanofiber with increase in time. UV-Visible Spectrophotometer is used for analysis of absorbance and transmittance of polyvinyl alcohol-magnetite nanoparticles solution, nanofiber and films. High-resolution scanning electron microscopy is used to analyze the dimension of nanofiber; High-resolution transmission electron microscopy is used to find the size of magnetite nanoparticles. Here, an online spectroscopic technique was used to study the release mechanism of nanoparticles from nanofibers samples of different layers during hydrodynamics. The results reveal that the quantity of magnetite nanoparticles can be controlled by embedding into nanofibers during hydrodynamics. Also, the spectroscopic results indicate the quantity of nanoparticles released from nanofiber. This mechanism can be utilized to control the required quantity of nanoparticles to release at particular location through a polymer mesh assembly.

TiO2-coated magnetite nanoparticle-supported sulfonic acid as a new, efficient, magnetically separable and reusable heterogeneous solid acid catalyst for multicomponent reactions

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 45974-45982 ◽  
Author(s):  
Ali Amoozadeh ◽  
Sanaz Golian ◽  
Salman Rahmani
Keyword(s):  
Magnetite Nanoparticles ◽  
Sulfonic Acid ◽  
Multicomponent Reactions ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Magnetite Nanoparticle ◽  
Magnetically Separable ◽  
Heterogeneous Solid

TiO2-coated magnetite nanoparticles-supported sulfonic acid (nano-Fe3O4–TiO2–SO3H (n-FTSA)) is synthesized by the immobilization of –SO3H groups on the surface of nano-Fe3O4–TiO2.

scholarly journals Potensi Nanopartikel Magnetit Pasir Besi Lampanah Aceh Besar Melalui Studi Kajian Teknik Pengolahan, Sintesis Dan Karakteristik Struktur

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Sri Nengsih
Keyword(s):  
Magnetite Nanoparticles ◽  
Qualitative Method ◽  
Structural Characteristics ◽  
Treatment Temperature ◽  
Synthesis Methods ◽  
Literature Study ◽  
Magnetite Nanoparticle ◽  
Experimental Process ◽  
Co Precipitation ◽  
The Magnetic Field

Research on the sand iron potential in generating magnetite nanoparticles in Lampanah Aceh Besar through a study of techniques processing, synthesis methods and structural characteristics has been completed. The method used in this research is qualitative method in the kind of literature study from the data of Banda Aceh ESDM Ministry. The results of this study indicate that iron sand in Lampanah area has a dominant element which contained Fe3O4. The magnetic separation method is used to separate the iron sand from impurities, while the co-precipitation synthesis of one of the methods chosen in generating the magnetite nanoparticles which due to a simple, economical experimental process and low treatment temperature. Through the XRD test, the cubic iron sand magnetite nanoparticles with a 2 angle are 35,55o, 57,13o and 62,70o with the hkl [311], [511] and [440], while the TEM and SEM tests showed that the dominant particle shape is round and the distribution is tight. Therefore, controlling the size and shape of iron sand magnetite nanoparticles will provide great potential in the magnetic field of magnetism. The conclusions of this study show that the iron sand located in Aceh Besar has the potential to be a magnetite nanoparticle.

scholarly journals Antibacterial Activity of Magnetite Nanoparticles Coated with Bee Pollen Extracts

2018 ◽  
Vol 1 (1) ◽  
pp. 579-585 ◽  
Author(s):  
Roxana Spulber ◽  
Carmen Chifiriuc ◽  
Mădălina Fleancu ◽  
Ovidiu Popa ◽  
Narcisa Băbeanu
Keyword(s):  
Antimicrobial Activity ◽  
Magnetite Nanoparticles ◽  
Pollen Extract ◽  
Biological Applications ◽  
Bioactive Substances ◽  
Antimicrobial Spectrum ◽  
Gram Negative ◽  
Bee Pollen ◽  
Ethanolic Extracts ◽  
Superparamagnetic Properties

Abstract In a nanobiotechnology world with many applications in biomedicine, a novel combination of inorganic-organic materials is needed to prove a novel functionality. Natural compounds from bee pollen extract coated on magnetite nanoparticles could open up a new way in apitherapy field. Iron oxide nanoparticles have proved special requirements for biological applications like superparamagnetic properties, high biocompatibility and nontoxic material. Magnetite nanoparticles functionalized with natural bioactive substances extracted from bee pollen have been characterised and investigated for antimicrobial activity. Previous findings demonstrate that magnetite nanoparticles (MNPs) and pollen ethanolic extracts (PEE) exhibited antimicrobial activity against a large antimicrobial spectrum, including Grampositive, Gram-negative and antifungal microorganisms.

Trace amount determination of Cd(ii), Pb(ii) and Ni(ii) ions in agricultural and seafood samples after magnetic solid phase extraction by MIL-101(Cr)/phenylthiosemicarbazide-functionalized magnetite nanoparticle composite

2018 ◽  
Vol 42 (21) ◽  
pp. 17636-17643 ◽  
Author(s):  
Masoomeh Mehraban ◽  
Mahboobeh Manoochehri ◽  
Faramarz Afshar Taromi
Keyword(s):  
Heavy Metals ◽  
Solid Phase Extraction ◽  
Magnetite Nanoparticles ◽  
Trace Amount ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Phase Extraction ◽  
Magnetite Nanoparticle ◽  
Magnetic Solid

Herein, a novel nanosorbent consisting of phenylthiosemicarbazide magnetite nanoparticles and MIL-101(Cr) was synthesized, characterized and utilized to magnetic solid phase extraction of some heavy metals in various agricultural and seafood samples.

scholarly journals Temperature-induced switchable magnetite nanoparticle superstructures

2020 ◽  
Vol 1 (1) ◽  
pp. 10-13
Author(s):  
Cathrin Kronenbitter ◽  
Hironobu Watanabe ◽  
Sadahito Aoshima ◽  
Helmut Cölfen
Keyword(s):  
Green Synthesis ◽  
Magnetite Nanoparticles ◽  
Room Temperature ◽  
Magnetite Nanoparticle ◽  
Co Precipitation

In this study we describe the green synthesis of temperature-switchable polymer-magnetite nanoparticles (PMNPs) in water at room temperature via an improved co-precipitation pathway for reversible switchable superstructures.

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