JP2012193356A - 界面活性剤被覆磁性ナノ粒子を含む相変化磁気インクおよびその製造プロセス - Google Patents
界面活性剤被覆磁性ナノ粒子を含む相変化磁気インクおよびその製造プロセス Download PDFInfo
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Abstract
【解決手段】相変化インク担体と、任意の着色剤と、任意の分散剤と、任意の相乗剤と、任意の酸化防止剤と、磁気コアおよびその上に配置されたシェルを含む界面活性剤被覆磁性ナノ粒子とを含む相変化磁気インク。
【選択図】なし
Description
1.a.界面活性剤被覆ナノ粒子。300℃にて93%Arと7%H2との気体混合物下で、1,2−ヘキサデカンジオール中界面活性剤(オレイン酸とトリオクチルホスフィン)の混合物中でFe(III)アセチルアセトネートおよびCo(II)アセチルアセトネートを還元分解することによって、(TEMによって測定された)平均粒径が10ナノメートルの界面活性剤被覆FeCo合金磁性ナノ粒子を得る。その実験手順は、J.Am.Chem.Soc.、120、7214〜5(2007)に詳細に記載されている。
未塗布金属ナノ粒子による火災危険の反例。MTI Corp.(米国カリフォルニア州Richmond)の未塗布の鉄ナノ粒子(平均粒径が50ナノメートル)を、安全対策として酸素量および湿分量がそれぞれ5ppm(百万分率)および5ppmになるようにアルゴンで最初に不活性化させたグローブボックス内に広げた。これらの条件下でも、それらのナノ粒子は即座に非常に高温になった。それらは、アルゴンガス中で(それぞれ5ppmの)微量の酸素および水によって迅速に酸化され、それらの磁性残留磁気特性のほとんどを実質的に失った。空気中で広げたとしたら、これらの自然発火性材料が即座に発火したであろう。
Claims (10)
- 相変化インク担体と、任意の着色剤と、任意の分散剤と、任意の相乗剤と、任意の酸化防止剤と、磁気コアおよびその上に配置されたシェルを含む界面活性剤被覆磁性ナノ粒子とを含む相変化磁気インク。
- 前記シェルは、ベータ−ヒドロキシカルボン酸、ベータ−ヒドロキシカルボン酸エステル、ソルビトールエステル、ポリマー化合物、ブロックコポリマー界面活性剤およびそれらの組合せからなる群から選択される界面活性剤を含む請求項1に記載の相変化磁気インク。
- 前記磁性ナノ粒子は、二種金属コアまたは三種金属コアを含む請求項1に記載の相変化磁気インク。
- 前記磁性ナノ粒子は、Fe、Mn、Co、Ni、FePt、CoPt、MnAl、MnBiならびにそれらの混合物および合金からなる群から選択されるコアを含む請求項1に記載の相変化磁気インク。
- 前記磁性ナノ粒子は、0.2ナノメートルから100nmの厚さを有するシェルを含む請求項1に記載の相変化磁気インク。
- 前記磁気コアは、アスペクト比が3:2から10:1未満の針状形を有する請求項1に記載の相変化磁気インク。
- 前記磁性ナノ粒子は、20emu/グラムから150emu/グラムの磁気飽和モーメントを有する請求項1に記載の相変化磁気インク。
- 前記磁性ナノ粒子は、20emu/gから100emu/gの残留磁気を有する請求項1に記載の相変化磁気インク。
- 相変化磁気インクを製造するためのプロセスであって、相変化インク担体と、任意の着色剤と、任意の分散剤と、任意の相乗剤と、任意の酸化防止剤と、磁気コアおよびその上に配置されたシェルを含む界面活性剤被覆磁性ナノ粒子とを混合すること、加熱して、金属ナノ粒子を含む相変化磁気インクを得ること、場合により相変化磁気インクを液体状態のまま濾過すること、および相変化磁気インクを冷却して固体状態にすることを含むプロセス。
- (1)相変化インク担体と、任意の着色剤と、任意の分散剤と、任意の相乗剤と、任意の酸化防止剤と、磁気コアおよびその上に配置されたシェルを含む界面活性剤被覆磁性ナノ粒子とを含む相変化磁気インクをインクジェット印刷装置に取り入れること、(2)インクを溶融させること、および(3)溶融インクの液滴を画像様パターンで基板上に噴射させることを含み、(4)相変化インク担体と、着色剤と、任意の分散剤と、任意の相乗剤と、任意の酸化防止剤とを含む相変化インクをインクジェット印刷装置に取り入れすこと、(5)インクを溶融させること、および(6)(5)の溶融インクの液滴を画像様パターンで基板上に噴射させることであって、該画像様パターンが、(4)のインクをMICR読取可能にするように(3)の画像様パターンを被覆し、該基板が場合により最終画像受取基板であることを場合によりさらに含むプロセス。
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US8646896B2 (en) | 2014-02-11 |
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