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Method for preparing a magnetic chain structure

A technology of magnetic chain and shell structure, applied in the preparation of microspheres, assembly of nanostructures, fabrication of nanostructures, etc., can solve problems such as dispersion and transient stability of chain structures

Inactive Publication Date: 2018-01-02
NANYANG TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nonetheless, chain-like structures generated in external fields often suffer from transient stability and often unravel when the field is removed

Method used

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  • Method for preparing a magnetic chain structure
  • Method for preparing a magnetic chain structure
  • Method for preparing a magnetic chain structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Example 1: Materials and Characterization

[0111] Dopamine, ferric chloride hexahydrate (FeCl 3 ·6H 2 O), ferrous chloride (FeCl 2 4H 2 O), ammonium hydroxide, oleic acid, sodium dodecyl sulfate (SDS), styrene, tetradecane, potassium peroxodisulfate (KPS), propidium iodide (PI), 4-nitrophenol ( 4-NPh) and sodium borohydride (NaBH 4 ) were purchased from Sigma Aldrich.

[0112] Tetrachloroauric acid (III) trihydrate (HAuCl 4 ·3H 2 O) From Alfa Aesar. Tris(hydroxymethyl)aminomethane (TRIS) was obtained from J.T. Baker. Methoxypolyethyleneglycolthiol (PEG-SH, 2kDa) was purchased from Laysan Bio Inc.

[0113] SH-MUC1 aptamer sequence 5'SH-TTTTTTTTTTGCAGTTGATCCTTTGGATACCCTGG-3' (35bp) and DNA control sequence: 5'SH-TTTTTTTTTTATACCTGGGGGAGTATATAAT-3' were obtained from Shanghai Sangon Biotechnology Incorporation (Shanghai, China) (31bp).

[0114] Ultrapure water (18.2 MΩ·cm) was purified using a Sartorius AG arium system and used for all experiments.

[0115] Sca...

Embodiment 2

[0122] Example 2: Synthesis of Magnetic Nanoparticles

[0123] Magnetic nanoparticles with 80 nm clustered Fe surrounded by a polystyrene shell were synthesized by miniemulsion polymerization 3 o 4 Cores made of nanocrystals ( image 3 a), and serve as building blocks for nanochains.

[0124] In the experiment, under nitrogen (N 2 ), 80°C under full agitation, the FeCl 3 ·6H 2 O (2.4g) and FeCl 2 4H 2 O (0.982 g) was dissolved in 10 ml deionized (DI) water. Then 5 ml of ammonium hydroxide was added rapidly to the solution. The color of the solution immediately changed to black. After 30 minutes, 3 ml of oleic acid was added and the suspension was maintained at 80°C for 1.5 hours. Gained magnetic nanoparticles in water (H 2 0) and methanol until the pH becomes neutral.

[0125] Magnetic nanoparticles (0.5 g) were added to 12 ml of water containing 10 mg SDS, and the mixture in an ice-water bath was treated with ultrasound for 10 minutes to obtain a microemulsion of ...

Embodiment 3

[0127] Example 3: Polydopamine (PDA) Coated Magnetic Nanoparticles

[0128] 0.2 ml of magnetic nanoparticles were dispersed in 40 ml of TRIS buffer (pH 8.5), followed by the addition of 10 mg of dopamine. The reaction solution was stirred for 4 hours. The dark brown product was purified by centrifugation and magnetic separation.

[0129] Such as transmission electron microscope (TEM) images ( image 3 As shown in (b), the nanoparticles were dispersed in a dopamine solution (0.15 mg / mL) containing Tris buffer (pH 8.5, 10 mM) and agitated for 4 hours to deposit a conformal layer of PDA on the nanoparticles.

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Abstract

A method for preparing a magnetic chain structure is provided. The method comprises providing a plurality of magnetic particles; dispersing the plurality of magnetic particles in a solution comprisinga dopamine-based material to form a reaction mixture; applying a magnetic field across the reaction mixture to align the magnetic particles in the reaction mixture; and polymerizing the dopamine-based material on the aligned magnetic particles to obtain the magnetic chain structure. A magnetic chain structure prepared by the method is also provided.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority from Singapore Patent Application No. 10201407815Q filed on 25 November 2014, the contents of which are hereby incorporated by reference in their entirety into this application for all purposes. technical field [0003] Various embodiments relate to flux linkage structures and methods for making flux linkage structures. Background technique [0004] There is a growing fundamental and practical interest in developing ordered assemblies of metals, semiconductors, and magnetic structures in which tailored interactions of surface plasmons, excitons, or magnetic moments give rise to interactions with individual Building blocks of distinct emerging collective identities. [0005] In a well-defined broad set, one-dimensional (1D) chain-like structures endowed by linear arrangements of functional units with oriented electronic, optical, and / or magnetic properties hold great prom...

Claims

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Application Information

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IPC IPC(8): B82Y25/00B82B1/00B82Y40/00C08G61/12H01F1/11H01F1/36B01J13/14B82Y5/00
CPCB82Y25/00B82Y40/00B82Y30/00B82B3/0052C08G61/124C08G2261/1422C08G2261/3221C08G2261/3241C08G2261/344C08G2261/43C08G2261/94C08G2261/964A61K9/5094H01F1/0054A61K31/713B01J13/14
Inventor 段宏伟周加境林宜昌林俊毓熊齐荣
Owner NANYANG TECH UNIV
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