ダイナミックな自己組み立てキャリアは,弱い磁石によって二磁性粒子の誘導を可能にします
Olga Chovnik1, Renata Balgley, Joel R Goldman
1Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel.
Journal of the American Chemical Society
|November 28, 2012
まとめ
研究者は,光交換可能な超パラ磁性ナノ粒子を用いて,ダイア磁性粒子を遠隔操作した. これらのナノ粒子は二磁性粒子に逆帰的に結合し,光と熱で標的の配送と放出を可能にします.
科学分野:
- 材料科学 材料科学とは
- ナノテクノロジー ナノテクノロジー
- マグネティズム (磁気) とは
背景:
- ダイア磁性材料は,通常,磁場によって抵抗されます.
- マイクロ/ナノ粒子の遠隔操作は,標的の配送と組み立てに不可欠です.
- ナノスケールでの粒子の相互作用を制御するには,高度な反応性のある材料が必要です.
研究 の 目的:
- ダイア磁性粒子の遠隔操作のための方法を開発する.
- 制御された粒子の組立と分解のために二重反応性ナノ粒子を利用する.
- 光と磁場を使用して,ダイア磁性粒子の標的の配送と放出を実証する.
主な方法:
- 光交換性および超パラマグネット性を持つ二重反応性ナノ粒子の合成.
- 紫外線で誘発された二磁性粒子表面への反転性ナノ粒子吸収の実証.
- ナノ粒子の吸収を解消するために,熱または環境光を活用します.
- ナノ粒子フィルムのダイナミックな自己組み立てによる魅力的な相互作用を誘導する.
- 磁気誘導と機能化された二磁性粒子のリモート配信.
主要な成果:
- 外部磁石を用いたダイア磁性粒子の遠隔操作に成功しました.
- UVと可視光を用いた反転可能なナノ粒子アドソルプション/デソルプションが実証されています.
- ナノ粒子層の分解のための熱と環境光の可逆性を示した.
- 二重反応性ナノ粒子の触媒量は,粒子誘導に十分であった.
- ダイア磁性粒子の標的の配達と制御された放出が達成されました.
結論:
- 二重反応性ナノ粒子は,ダイア磁性粒子の効果的な遠隔磁気操作を可能にします.
- ライトトリガーの可逆組立/分解は,粒子の相互作用と位置付けの正確な制御を提供します.
- このテクニックは,さまざまな分野におけるターゲティング・デリバリーおよびコントロール・リリースのアプリケーションのための新しいプラットフォームを提供します.
関連する概念動画
01:26Diamagnetism
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
01:14Diamagnetic Shielding of Nuclei: Local Diamagnetic Current
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
01:17Magnetic Damping
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
01:18Other Unique Bacteria
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...
01:25Magnetic Force On A Current-Carrying Conductor
Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...