JP4385166B2 - 流体の制御方法 - Google Patents
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Description
空気圧でマイクロチャネルを押しつぶすことにより、流れを遮断する方法。この方法は流体の種類によらず適用可能であるが、集積化には不向きである。
マイクロチャネル内に圧力差を設け、流体の流れを制御する方法。この方法はバルブの作製は比較的容易であるが、制御が複雑になる。
ゾル部分を流体中に混入しておき、レーザー光を局所的に照射することによりゲル化させ流れを制御する方法。この方法は複雑な制御は可能であるが、使用流体にゾルを混入しなければならない。
pHに応じて膨張、収縮し体積が変わるゲルを流路中に配置し、流体のpHを変化することにより流れを制御する方法。この方法は異なるpH感受性ゲルの作成が可能であるため複数方向への流れの制御が可能であるが、流体中のpHを制御することが必要になる。
熱感受性樹脂であるポリ(N−イソプロピルアクリルアミド)で処理して、熱を加えることにより表面の対水接触角を制御する方法である。この方法によれば、表面の対水接触角は32〜33℃以上で接触角約30度、それ以下の温度で70度となる。この方法は、熱を制御手段として使えるものであるが、常にその部位を加熱、冷却により温度調整する必要がある。
(1)親水化部位に光を照射してその表面の対水接触角を低下させ(親水化工程)、
(2)対水接触角低下後の親水化部位の対水接触角よりも大きな対水接触角の表面を与える対水接触角増大物質を含む対水接触角制御材料から対水接触角増大物質を放出させ(放出工程)、
(3)放出した対水接触角増大物質を親水化部位の表面に接触させ、該表面に対水接触角増大物質を付着させて親水化部位の対水接触角を増大させる(疎水化工程)
ことを特徴とするマイクロチャネル内の流体制御方法(第3の発明)に関する。
(1)親水化部位に光を照射してその表面の対水接触角を低下させ(親水化工程)、
(2)対水接触角低下後の親水化部位の対水接触角よりも大きな対水接触角の表面を与える対水接触角増大物質を含む対水接触角制御材料から対水接触角増大物質を放出させ(放出工程)、
(3)放出した対水接触角増大物質を親水化部位の表面に接触させ、該表面に対水接触角増大物質を付着させて親水化部位の対水接触角を増大させる(疎水化工程)
ことを特徴とするマイクロチャネル内の流体制御方法に関する。
石英ガラス基板に酸化チタンを厚さ500nmに蒸着して酸化チタンコート石英ガラス基板を作製した。この酸化チタンコート表面の対水接触角は70度であった。ついで、この基板をポリスチレン製のシャーレに封入し、室温(25℃)にて紫外線ランプ(Spectronics corp.製のSpectroline ENF280C)により紫外線(波長254nm光源8Wのブラックライト)を10分間照射し、酸化チタンコート表面の対水接触角を測定したところ、5度以下と大きく対水接触角が低下し、親水性になっていた。
石英ガラス基板に酸化チタンを厚さ500nmに蒸着して酸化チタンコート石英ガラス基板上にマイクロチャネル(幅400μm、深さ32μm)をT字型に形成したPDMSを接着して、図5に示す試験用のマイクロデバイスを作製した。図5は概略平面図であり、流路の全面が疎水性の酸化チタンコートされている。
A−2成分:ジメチルビニル化およびトリメチル化されたシリカ
A−3成分:テトラキス(トリメチルシリルオキシ)シラン
B液:B−1成分:トリメチルシリル基で末端封止されたジメチルシロキサンとメチルハイドロシロキサン共縮合体
B−2成分:2,4,6,8−テトラメチルテトラビニルシクロテトラシロキサン
B−3成分:ジメチルビニル化およびトリメチル化されたシリカ(A−2成分と同じ)
B−4成分:ジメチルビニル基で末端封止されたジメチルシロキサン(A−1成分と同じ)
つぎの4つの基板上にそれぞれ、2mmの距離で紫外線(波長254nm。光源:8Wのブラックライト)を照射した。照射開始から経時的に各基板の表面の対水接触角を測定した。その結果を図6に示す。
基板2:1%Crドープ酸化チタンコート石英ガラス(対水接触角:95度)
基板3:5%Crドープ酸化チタンコート石英ガラス(対水接触角:75度)
基板4:TiO2/SrTiO3(対水接触角:60度)
厚さ3mm、7mmおよび18mmのPDMSシート(実施例2で用いたシリコーンエラストマー組成物をシートにしたもの)を用い、スペーサ(1mm)を介して酸化チタンコート石英ガラス基板上に載置し、PDMSシートに紫外線(波長254nm。光源:8Wのブラックライト)を照射した。照射開始から経時的に各基板の表面の対水接触角を測定した。その結果を図7に示す。
親水性表面を有する板状材料1を直径90mmポリスチレンシャーレに入れ、同じシャーレに対水接触角制御材料(=対水接触角増大物質)が100μl入った小さな容器を配置し、シャーレに蓋をした。このシャーレ全体に室温(25℃)にて紫外線ランプにより紫外線(波長254nm)を30分間照射した後、板状材料を取り出し、上面の対水接触角を接触角計により測定した。結果を表1に示す。
実施例2で作製した図5に示す試験用のマイクロデバイスの図中の斜線の部分を波長325nmの紫外線レーザー光(He−Cdレーザー)で1分間流路に沿って1min./spotの速度で照射し、チャネル4cと4aを親水化した。ついで、チャネル4c側から青色に着色された超純水をマイクロシリンジで50μl/時となるように注入したところ、超純水はチャネル4cからチャネル4aに約8mm/sの流量(VR)で流れ、チャネル4bへの流量(VL)はゼロであった。
Claims (19)
- マイクロチャネル内の流体の流れを制御する方法であって、該マイクロチャネルの表面の少なくとも一部が光照射により対水接触角を低下させる能力を有する物質から構成されている親水化部位を有しており、
(1)該親水化部位に光を照射してその表面の対水接触角を低下させ、
(2)対水接触角低下後の親水化部位の対水接触角よりも大きな対水接触角の表面を与える対水接触角増大物質を含む対水接触角制御材料から対水接触角増大物質を放出させ、
(3)放出した対水接触角増大物質を親水化部位の表面に接触させ、該表面に対水接触角増大物質を付着させて親水化部位の対水接触角を増大させる
ことを特徴とするマイクロチャネル内の流体制御方法。 - 前記(3)に引き続き、(4)対水接触角増大物質が付着した親水化部位に光を照射して該親水化部位表面の対水接触角を再度低下させる請求項1記載の方法。
- 前記(2)〜(4)を繰り返すことによりマイクロチャネル内の流体の流路を交互に切り替える請求項2記載の方法。
- 光照射により対水接触角を低下させる能力を有する物質が光触媒作用を有する物質である請求項1〜3のいずれかに記載の方法。
- 光照射により対水接触角を低下させる能力を有する物質が酸化チタンである請求項1〜4のいずれかに記載の方法。
- 対水接触角制御材料から対水接触角増大物質を放出させる手段が、光照射または加熱である請求項1〜5のいずれかに記載の方法。
- 光の光源が、レーザー発生装置、紫外線ランプまたは水銀ランプである請求項1〜6のいずれかに記載の方法。
- 光を照射する方法が、深度方向に焦点を変え得る照射方法である請求項1〜7のいずれかに記載の方法。
- 対水接触角増大物質を含む対水接触角制御材料が対水接触角増大物質単独またはそれを含む液体または固体である請求項1〜8のいずれかに記載の方法。
- 対水接触角制御材料が対水接触角増大物質であるジメチルシロキサンを放出し得るポリジメチルシロキサンである請求項1〜9のいずれかに記載の方法。
- 対水接触角増大物質が有機ケイ素化合物である請求項1〜10のいずれかに記載の方法。
- マイクロチャネルの親水化部位以外の部分が対水接触角増大物質を含む対水接触角制御材料で作製されている請求項1〜11のいずれかに記載の方法。
- 光遮蔽パターンを介して親水化部位の所定の領域に光を選択的に照射して親水性部位と疎水性部位を選択的に設ける請求項1〜12のいずれかに記載の方法。
- 遮蔽パターンを介して対水接触角制御材料の所定の領域に光または熱を選択的に加えて親水性部位と疎水性部位を選択的に設ける請求項1〜13のいずれかに記載の方法。
- マイクロチャネル内に配設されるバルブであって、疎水性部位と親水化部位とを有し、該疎水性部位が光または熱を作用させることにより対水接触角増大物質を放出しうる対水接触角制御材料で作製されており、該親水化部位が光照射により対水接触角を低下させる能力を有する物質で作製されているマイクロチャネル用バルブ。
- 光照射により対水接触角を低下させる能力を有する物質が、親水性と光触媒作用の両者を発現し得る物質である請求項15記載のバルブ。
- 親水性と光触媒作用の両者を発現し得る物質が、酸化チタンである請求項16記載のバルブ。
- 請求項15〜17のいずれかに記載のバルブを有するマイクロデバイス。
- 請求項15〜17のいずれかに記載のバルブを有するマイクロセンサ。
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PCT/JP2004/014499 WO2005032707A1 (ja) | 2003-10-03 | 2004-10-01 | 流体の制御方法 |
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Cited By (3)
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WO2013077119A1 (ja) * | 2011-11-21 | 2013-05-30 | シャープ株式会社 | 基板およびマイクロチップ並びに基板の製造方法およびマイクロチップの製造方法 |
KR101508317B1 (ko) | 2014-07-24 | 2015-04-07 | 한양대학교 산학협력단 | 소수도 가변재질기반 미세유동채널 및 그 제작방법 |
KR20200068162A (ko) * | 2018-12-04 | 2020-06-15 | 한국기계연구원 | 기상시료의 유해인자 포집장치 |
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JP4361343B2 (ja) * | 2003-10-03 | 2009-11-11 | ダイキン工業株式会社 | 対水接触角の制御方法 |
US20080305278A1 (en) * | 2007-06-05 | 2008-12-11 | Jacobsen Stephen C | Glass coating of polymers |
EP2011629A1 (de) * | 2007-07-03 | 2009-01-07 | F. Hoffman-la Roche AG | Verfahren zur Herstellung eines mikrofluiden Systems auf einer Polymeroberfläche |
KR100912540B1 (ko) | 2007-12-14 | 2009-08-18 | 한국전자통신연구원 | 세척 효과를 개선하기 위한 미세 채널을 형성하는 칩 |
DE102011115622A1 (de) | 2010-12-20 | 2012-06-21 | Technische Universität Ilmenau | Mikropumpe sowie Vorrichtung und Verfahren zur Erzeugung einer Fluidströmung |
US9162226B2 (en) * | 2011-05-12 | 2015-10-20 | The United States Of America, As Represented By The Secretary Of Commerce | Foldable microfluidic devices using double-sided tape |
JP2017080820A (ja) * | 2015-10-22 | 2017-05-18 | 学校法人立命館 | 流体デバイスの製造方法および流体デバイス |
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CN110763670A (zh) * | 2019-11-11 | 2020-02-07 | 山东师范大学 | 自分离多相混合液的拉曼增强活性衬底及制备方法与应用 |
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Cited By (5)
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WO2013077119A1 (ja) * | 2011-11-21 | 2013-05-30 | シャープ株式会社 | 基板およびマイクロチップ並びに基板の製造方法およびマイクロチップの製造方法 |
JP2013108853A (ja) * | 2011-11-21 | 2013-06-06 | Sharp Corp | 基板およびマイクロチップ並びに基板の製造方法およびマイクロチップの製造方法 |
KR101508317B1 (ko) | 2014-07-24 | 2015-04-07 | 한양대학교 산학협력단 | 소수도 가변재질기반 미세유동채널 및 그 제작방법 |
KR20200068162A (ko) * | 2018-12-04 | 2020-06-15 | 한국기계연구원 | 기상시료의 유해인자 포집장치 |
KR102185548B1 (ko) * | 2018-12-04 | 2020-12-03 | 한국기계연구원 | 기상시료의 유해인자 포집장치 |
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EP1683570A4 (en) | 2010-11-10 |
WO2005032707A1 (ja) | 2005-04-14 |
US20070034269A1 (en) | 2007-02-15 |
EP1683570A1 (en) | 2006-07-26 |
JPWO2005032707A1 (ja) | 2007-11-15 |
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