JP2012193349A - コーティングされた磁気ナノ粒子を含む硬化性インク - Google Patents
コーティングされた磁気ナノ粒子を含む硬化性インク Download PDFInfo
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- JP2012193349A JP2012193349A JP2012037249A JP2012037249A JP2012193349A JP 2012193349 A JP2012193349 A JP 2012193349A JP 2012037249 A JP2012037249 A JP 2012037249A JP 2012037249 A JP2012037249 A JP 2012037249A JP 2012193349 A JP2012193349 A JP 2012193349A
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
- H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
- H01F1/0054—Coated nanoparticles, e.g. nanoparticles coated with organic surfactant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
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Abstract
【解決手段】モノマー、光開始剤、任意の硬化性オリゴマー、および1つ以上の任意の添加剤を含む硬化性インクキャリア;コーティングされた磁気ナノ粒子であって、このコーティングされた磁気ナノ粒子が、磁気金属コアおよびこの磁気金属コアに配置された保護コーティングを含むナノ粒子;および任意の着色剤を含むインク。前記磁気金属コアが、Fe、Mn、Co、Ni、FePt、CoPt、MnAlおよびMnBiならびにこれらの混合物からなる群から選択されるインク。
【選択図】なし
Description
炭素コーティングされた磁気ナノ粒子を用いた磁気インク濃縮物の製作
ステンレス・スチール・ショット(1,800g)を充填した磨砕機に、プロポキシル化ネオペンチルジアクリレート硬化性モノマー(SR9003、57.6g、Sartomer Co.Inc.,Exeter,PAから得られた)および27.4gのEFKA4340(以前はCiba、現在はBASFから入手可能なメトキシプロパノール中のアクリルブロックコポリマーからなる分散剤;メトキシプロパノールは使用前に蒸留によって除去された)を添加した。得られた混合物は、200r.p.m.にて撹拌しながら、分散液を50℃未満に維持した。次いで、15gの炭素コーティングされた鉄ナノ粒子(Nanoshel Corporation,Wilmington,DEから得られた、平均粒子直径25nmを有する)を1分間かけて添加した。次いでこの混合物を、20時間撹拌し、次いでステンレス・スチール・ショットを除去するためにふるいにかけ、炭素コーティングされた鉄粒子の濃縮分散液(約15%濃度)を得た。
シリカコーティングされた磁気ナノ粒子を用いた磁気インク濃縮物の製作
平均粒径300nmのシリカコーティングされた鉄ナノ粒子は、FeCl3・6H2OをNaOH/N2H4・H2O還元剤で還元することによって合成する。エタノールで洗浄した後、シリカコーティングをStober方法を用いることによって堆積させる。この手順において、シリカ層は、テトラエチルオルトシリケート前駆体から堆積させ、それをアンモニア/水混合物にてpH8〜9にて40℃で4時間加水分解する。シリカコーティングされた鉄ナノ粒子の製作手順は、Materials Chemistry and Physics 10:206−212(2010)におけるNi et alによって完全に記載される。
炭素コーティングされた鉄ナノ粒子を含有するUV硬化性磁気インクの製作
13重量%の炭素コーティングされた鉄磁気粒子を有する10gのインクは、8.73gの15重量%の磁気鉄ナノ粒子分散液、0.5gのジペンタエリスリトールペンタアクリレート硬化性モノマー(SR399LV、Sartomer Corporationから得られた)、0.3gのIRGACURE379光開始剤(2−(4−メチルベンジル)−2−(ジメチルアミノ)−1−(4−モルホリノフェニル)ブタン−1−オン(BASF Corporation,Wilmington,DEから得られた)、0.1gのIRGACURE819光開始剤(ビス(2,4,6−トリメチルベンゾイル)−フェニルホスフィンオキシド(BASF Corporationから得られた)、0.35gのIRGACURE127光開始剤(2−ヒドロキシ−1−{4−[4−(2−ヒドロキシ−2−メチル−プロピオニル)−ベンジル]−フェニル}−2−メチル−プロパン−1−オン(BASF Corporationから得られた)、および0.02gのIRGASTAB UV10(缶内窒酸化物系安定剤、BASF Corporationから得られた)を混合することによって調製された。得られた混合物を、ガラス瓶中で85℃にて2時間撹拌した。インクを、加熱された1μmのフィルター装置を通して圧力下でろ過し、最終インクを与える。
シリカコーティングされた鉄ナノ粒子を含有するUV硬化性磁気インクの製作
実施例3の手順を、炭素コーティングされた鉄ナノ粒子を含有するインク濃縮物(実施例1から)を、シリカコーティングされた鉄ナノ粒子を含有する8.7gのインク濃縮物(実施例2から)で置換することによって繰り返し、13%のシリカコーティングされた鉄ナノ粒子を含有する10gの硬化性インクを提供する。
UV硬化性磁気インクの製作のための一般的手順
実施例3に記載される手順を、インク構成成分の量を表1に示される範囲内で変更することによって繰り返す。個々のインク構成成分のための具体的な量を選択する場合に、最終インクの構成成分すべての合計は100%になると理解される。
硬化性ゲルUVインクの製作
実施例3からの手順を、同じ量のインク構成成分を用いて繰り返し、これに、米国特許第7,714,040号明細書(その開示が参考として本明細書に完全に組み込まれる)のインク実施例Aに開示されるものと同じ0.57gのアミドゲル化剤を、開始剤がインク組成物に添加されるときに添加する。これにより、約12%の炭素コーティングされた鉄ナノ粒子を含有する10.75gの硬化性ゲルUVインクが得られる。
硬化性ゲルUVインクの製作のための一般的手順
実施例5に記載される手順を、表2に示されるように、インクに5〜10%の割合でアミドゲル化剤を添加することによって繰り返す。
ポリマーコーティングされた磁気ナノ粒子を含有する硬化性磁気インク
ポリスチレンコーティングされたコバルトナノ粒子は、アルゴン下、160℃にて、4:1(w/w)の比にてホスフィンオキシド基で末端処理されたポリスチレンポリマーおよびアミン末端処理されたポリスチレンの存在下、溶媒としてのジクロロベンゼン中のジコバルトオクタカルボニルの30分間の熱分解によって得られる。反応混合物を、ヘキサン中に沈殿させ、さらに洗浄してポリスチレンコーティングされたコバルトナノ粒子を得る。製作プロセスは、US2010/0015472A1(Bradshaw)に記載される。
界面活性剤でコーティングされた磁気ナノ粒子を有する硬化性磁気インク
約10nm(TEMで決定される場合)の平均径の界面活性剤コーティングされたFeCo合金磁気ナノ粒子は、300℃にて、93%のAr+7%H2のガス混合物下、1,2−ヘキサデカンジオール中の界面活性剤の混合物(オレイン酸およびトリオクチルホスフィン)中、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の還元分解によって得られる。実験的手順は、J.Am.Chem.Soc.120:7214−5(2007)に完全に記載されている。濃縮物(実施例1)およびインク(実施例3)の両方のインクの製作手順を、炭素コーティングされた鉄ナノ粒子を、上記のような界面活性剤の混合物でコーティングされたFeCoナノ粒子で置換することによって繰り返す。
実施例3からのインク組成物の液滴をピペットを用いて紙の上に堆積させた。インクコーティングされた紙を、水銀D−バルブを備えた600W Fusion UV Systems,IncのLighthammerランプ下に32フィート/分のベルト速度にて通すことによって液滴を硬化させた。スキン層が、液滴表面に視覚可能であり、硬化が行われたことを示す。
Claims (10)
- モノマー、
光開始剤、
任意の硬化性オリゴマー、および
1つ以上の任意の添加剤を含む硬化性インクキャリア;
コーティングされた磁気ナノ粒子であって、このコーティングされた磁気ナノ粒子が、磁気金属コアおよびこの磁気金属コアに配置された保護コーティングを含むナノ粒子;および
任意の着色剤
を含むインク。 - 前記磁気金属コアが、Fe、Mn、Co、Ni、FePt、CoPt、MnAlおよびMnBiならびにこれらの混合物からなる群から選択される、請求項1に記載のインク。
- 前記保護コーティングが、炭素材料、ポリマー材料、無機酸化物、界面活性剤およびこれらの混合物からなる群から選択される、請求項1に記載のインク。
- 前記保護コーティングが約0.2nm〜約100nmの厚さを有する、請求項1に記載のインク。
- 前記磁気ナノ粒子が、約20emu/グラム〜約100emu/グラムの残留力を有する、請求項1に記載のインク。
- 前記磁気ナノ粒子が、約200エルステッド〜約50,000エルステッドの保磁力を有する、請求項1に記載のインク。
- 前記磁気ナノ粒子が、約20emu/グラム〜約150emu/グラムの磁気飽和モーメントを有する、請求項1に記載のインク。
- 前記ナノ粒子のサイズが、すべての次元で、約3nm〜約300nmである、請求項1に記載のインク。
- 前記磁気金属コアが、約3:2〜約10:1のアスペクト比を有するニードル様形状を有する、請求項1に記載のインク。
- 次からなる群から選択されるゲル化剤をさらに含む、請求項1に記載のインク:
(a)次の一般構造を有するポリアミド:
(c)エステル末端処理されたジアミド化合物;および
(d)トランス−1,2−シクロヘキサン−ビス(尿素−ウレタン)化合物。
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