JP2007210092A - ナノ粒子を製造する方法及びシステム - Google Patents
ナノ粒子を製造する方法及びシステム Download PDFInfo
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- JP2007210092A JP2007210092A JP2006349439A JP2006349439A JP2007210092A JP 2007210092 A JP2007210092 A JP 2007210092A JP 2006349439 A JP2006349439 A JP 2006349439A JP 2006349439 A JP2006349439 A JP 2006349439A JP 2007210092 A JP2007210092 A JP 2007210092A
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Classifications
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Abstract
【解決手段】本方法及びシステムは、高温かつ高圧に維持した少なくとも1つのCSTR又はPRR(102)内部において及びその内部で1つ又はそれ以上の触媒基板に反応溶液を適用することができる処理容器内において水熱プロセスを用いて無機前駆体化合物からナノ粒子を生成するようにする。作動中、反応溶液は、CSTR内において、例えば10nm未満の所望の平均粒径を有するナノ粒子の形成及び/又は堆積を得るのに十分な反応時間の間における実質的に一定の濃度及び反応温度範囲内に維持することができる。基本的方法及びシステムの変形形態により、例えば複雑な粒度分布プロフィールの生成、及び単一基板上での選択的な多峰性粒度分布の堆積を得ることができる。
【選択図】 図1
Description
図2に示す例示的な実施形態にほぼ対応する反応システムにおいて465ppb(全重量基準で)のPt濃度のNa2Pt(OH)6の水性Pt反応溶液を使用して、白金ナノ粒子を生成した。当業者には分かるように、化学種の濃度範囲は通常、大きな困難性なしに、所望の平均粒径及び所望の粒度分布の両方に応じて例えば約1ppbから数ppmまで制御することができる。
102 主反応容器
104 ジャケットヒータ
106 再循環ポンプ
108 再循環ループ
110a 弁
110b 弁
112a 処理容器
112b 処理容器
113 弁
113a 弁
113b 弁
114 弁
114a 弁
114b 弁
116 装置
116 装置
117 弁
118 供給源
120 ポンプ
122 容器
122a 容器
122b 容器
124 ポンプ
124a ポンプ
124b ポンプ
126 制御弁
126a 弁
126b 弁
129 装置
130 ポンプ
200 システム
300 システム
Claims (10)
- ナノ粒子を製造する方法であって、
目標元素を含む無機前駆体化合物の水性反応溶液を形成する段階と、
高温かつ高圧で前記前駆体化合物を加水分解して、20nm未満の平均粒径を有する前記目標元素のナノ粒子を前記反応溶液内に形成する段階と、
を含むことを特徴とする方法。 - 前記ナノ粒子が、10nm未満の平均粒径を有することを特徴とする請求項1記載の方法。
- 前記高温が、少なくとも38℃であり、また前記高圧が、少なくとも1.4MPaであることを特徴とする請求項1又は請求項2記載の方法。
- 前記高温が、少なくとも282℃であり、また前記高圧が、少なくとも8.3MPaであることを特徴とする請求項1又は請求項2記載の方法。
- 前記目標元素のナノ粒子を処理して、該目標元素の酸化物、窒化物及び炭化物からなる群から選択された二次ナノ粒子を生成する段階をさらに含むことを特徴とする請求項1から請求項4のいずれか1項記載の方法。
- 前記ナノ粒子上に共通表面電荷を誘起するのに十分な目標pHを前記反応溶液内で維持する段階をさらに含むことを特徴とする請求項1から請求項5のいずれか1項記載の方法。
- 触媒基板上に前記反応溶液から前記ナノ粒子の一部分を堆積させる段階をさらに含むことを特徴とする請求項1から請求項6のいずれか1項記載の方法。
- 前記触媒基板上に共通電荷を形成して、前記触媒基板の表面上への前記ナノ粒子の堆積を誘起する段階をさらに含むことを特徴とする請求項7記載の方法。
- 請求項1から請求項8のいずれか1項記載の方法によりナノ粒子を生成しかつ堆積させるためのシステムであって、
連続撹拌式タンク反応器(CSTR)(102)と、
前記CSTRに作動可能に結合され、前駆体化合物の反応溶液を該反応溶液内に分散したナノ粒子を生成するのに十分な条件下で前記CSTRを通して繰り返し通過させるように構成された再循環システム(106、108)と、
前記反応溶液内に第1の前駆体化合物濃度を維持するための第1の比率で前記再循環システム内に前駆体溶液を注入するように構成された前駆体溶液タンク(122)と、
システムボリュームを維持するために前記再循環システム内に水を注入するように構成された補給水容器(118)と、
触媒基板を保持しかつ前記触媒基板を前記反応溶液に曝すように構成された少なくとも1つの処理容器(112a、112b)と、
を含むシステム。 - 前記反応溶液の一部分を除去するように前記再循環システムに結合された清浄化ポート(117)をさらに含むことを特徴とする請求項9記載のシステム。
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