JP7070574B2 - 無機構造体、デバイス及び無機構造体の製造方法 - Google Patents
無機構造体、デバイス及び無機構造体の製造方法 Download PDFInfo
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- JP7070574B2 JP7070574B2 JP2019541024A JP2019541024A JP7070574B2 JP 7070574 B2 JP7070574 B2 JP 7070574B2 JP 2019541024 A JP2019541024 A JP 2019541024A JP 2019541024 A JP2019541024 A JP 2019541024A JP 7070574 B2 JP7070574 B2 JP 7070574B2
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Description
ポリマーを含む基材表面に金属及び/又は無機材料を形成することにより、前記基材表面に前記金属及び/又は前記無機材料を含む繊維体及び/又はシェルが3次元的に連結している自立構造を形成する形成工程と、
前記基材の全部又は一部を除去する除去工程と、
を含むものである。
本開示の無機構造体は、金属及び/又は無機材料を含む繊維体及び/又はシェルが3次元的に連結している自立構造を備えている。この無機構造体において、繊維体やシェル(殻)は、金属及び/又は無機材料からなるナノ粒子の凝集体からなるものとしてもよい。また、この無機構造体は、金属及び/又は無機材料からなるナノ粒子の凝集体からなるシェルが3次元的に連結している自立構造を備えた無機ナノ構造ファブリックとしてもよい。ここで、「ナノ粒子」とは、粒径が1nm以上10nm以下である粒子をいう。ナノ粒子は、結晶質であっても良く、あるいは、非晶質であってもよい。このナノ粒子の材料は特に限定されるものではなく、目的に応じて最適な材料を選択することができる。
(b)貴金属、典型金属及び遷移金属のうち少なくとも1以上を含む合金からなる金属ナノ粒子。
(c)金属酸化物、金属硫化物、金属窒化物、金属炭化物、金属リン化物、若しくは、金属ヨウ化物からなる金属化合物ナノ粒子。
(d)カーボンナノ粒子。
ポリマー残存率=(W-Wm)×100/(W0-Wm) ・・・(1)
本開示のデバイスは、上述した無機構造体を触媒層、フィルタ、導電部材、タンパク質回収材及び光熱変換材のうち1以上として用いたものである。このようなデバイスとしては、例えば、
(a)無機構造体を触媒層に用いた固体高分子形燃料電池、
(b)無機構造体を触媒層に用いた水電解装置、
(c)無機構造体をフィルタに用いたろ過装置、
(d)無機構造体を電極部材、集電部材、導電部材に用いた蓄電装置又は駆動装置、
(e)無機構造体をタンパク質を選択的に回収する回収材として用いた分離回収装置、
(f)無機構造体を光を吸収し熱へ変換する光熱変換材として用いた光熱変換装置、
などが挙げられる。
本開示の無機構造体の製造方法は、基材表面に金属及び/又は無機材料の自立構造を形成する形成工程と、基材の全部又は一部を除去する除去工程と、を含む。
この工程では、ポリマーを含む基材表面に金属及び/又は無機材料を形成することにより、基材表面に金属及び/又は無機材料を含む繊維体及び/又はシェルが3次元的に連結している自立構造を形成する。この工程では、基材表面に金属及び/又は無機材料を物理蒸着してもよい。
(a)エレクトロスピニングなどにより作製したナノワイヤー不織布、
(b)曲率半径が20nm以上200nm以下である細孔を備えた多孔膜(いわゆる、「メンブレーンフィルタ」)、
(c)ポリスチレン粒子等からなるオパール構造を持つ多孔膜、
などが挙げられる。
この工程では、基材表面に繊維体及び/又はシェルを形成した後、基材の全部又は一部を除去する処理を行う。基材は、その全部を除去してもよく、あるいは、一部を除去してもよい。基材/ナノ粒子界面の量を低減するためには、基材の全部を除去するのが好ましい。基材の除去方法は、特に限定されるものではなく、基材の種類に応じて最適な方法を選択することができる。例えば、基材として溶媒可溶性のポリマーを用いた場合、溶媒を用いて基材を除去するのが好ましい。各種ポリマーを溶解可能な溶媒としては、例えば、ジメチルホルムアミド(DMF)、N-メチル-2-ピロリドン(NMP)、NaBH4溶液(溶媒:水とエタノールの1対1混合液)、クロロホルム、アセトン、メタノール、エタノール等のアルコール類、水、2-メチルテトラヒドロフラン、ジオキサン、ジメチルスルホキシド、スルホラン、ニトロメタンなどが挙げられる。
[実施例1,2]
PES製のメンブレーンフィルタ(商品名:ミリポアPES)を4cm角に切り出し、その表面に、スパッタ法を用いてPt膜を形成した(形成工程)。スパッタは、HITACHI社製MC1000イオンスパッタ装置を用い、Ar雰囲気中で行った。次いで、DMF及びNMPを用いてPESを除去し(除去工程)、Ptのみからなる自立構造を有する無機構造体を得た。これを実施例1とした。また、基材として、PVDF製のメンブレーンフィルタを用いた以外は、実施例1と同様にして、Ptのみからなる自立構造を有する無機構造体を得た。これを実施例2とした。
図3は、IrO2ナノワイヤー不織布(実施例3)の作製手順を示す説明図である。まず、PVPの8質量%メタノール溶液を1kV/cmで電界紡糸することで、直径が100~200nmのPVPポリマーナノワイヤーからなる不織布を作製した。図3Aは、作製したPVPナノワイヤー不織布の写真である。次に、このPVPナノワイヤー不織布の表面に、スパッタ法を用いてIrO2膜を形成した。IrO2膜は、酸素5%-アルゴン95%雰囲気下において、Irをスパッタすることにより形成した。図3Bは、IrO2をスパッタしたPVPナノワイヤー不織布の写真である。また、図3C及び図3Dは、それぞれ、IrO2膜を形成したPVPナノワイヤーのSEM写真及び模式図である。
PVPの4質量%メタノール溶液を1kV/cmで電界紡糸することで、直径が10~20nmのPVPポリマーナノワイヤーからなる不織布を作製した。以下、このPVPナノワイヤー不織布を基材に用いた以外は実施例3と同様にして、IrO2ナノワイヤー不織布を得た。これを実施例4とした。
作製した実施例1~4の無機構造体に対して、走査型電子顕微鏡(SEM,HITACHI社製FE5500)を用いて微細構造の観察を行った。図4は、実施例1~3の観察結果であり、図4Aが実施例1の低倍率SEM像、図4Bが実施例1の高倍率SEM像である。また、図4Cが実施例2の低倍率SEM像、図4Dが実施例2の高倍率SEM像である。また、図4Eが実施例3の低倍率SEM像、図4Fが実施例3の高倍率SEM像である。図4A~図4Dより、以下のことがわかった。上記作製方法によれば、ポリマーからなるメンブレーンフィルタの細孔構造がそのまま転写され、柔軟性があるPtからなる自立構造を有する無機構造体が得られた。この無機構造体は、直径が3~10nmのPtナノ粒子の凝集体からなっていることがわかった。また、図4E及び図4Fに示すように、上記作製方法によれば、ポリマー製の不織布のナノ構造がそのまま転写され、柔軟性があるIrO2ナノワイヤー不織布が得られることがわかった。また、このIrO2ナノワイヤー不織布構造は、直径が3~10nmのIrO2ナノ粒子の凝集体からなることがわかった。
小型電界紡糸装置を用いてポリマー製不織布を作製し、小型卓上スパッタ装置(HITACHI社製MC1000イオンスパッタ装置)を用いてこのポリマー製不織布の表面に金属の自立構造を形成したのち、ポリマー製不織布を除去し、無機構造体を得た。スパッタには、Pt、Au、Ag、Cu、Sn、Ru、Irの金属ターゲットを用い、得られた無機構造体をそれぞれを実施例5~11とした。テンプレートとして用いた直径100~200nmのPVPナノファイバー不織布は、PVPの10質量%メタノール溶液を1kV/cmで電界紡糸することで作製した。この表面に上記金属ターゲットでスパッタ蒸着したのち、鋳型として用いたPVPナノファイバー不織布を、0.5MのNaBH4溶液(溶媒:水とエタノールの1対1混合液)の中で30分撹拌することで除去した。なお、スパッタは、不活性雰囲気(Arガス)中で行った。
実施例5と同様に、直径100~200nmのPVPナノファイバー不織布の表面に、Niターゲットを用いてNi膜を100nm厚でスパッタ蒸着した。この蒸着体を、水溶液に浸漬することで、ナノワイヤー不織布状のNi構造体(Niナノ構造布)を得た。図9は、実施例12の不織布構造を有する無機構造体の写真であり、図9Aが10mm角のNiナノ構造布を純水に浮かべた写真であり、図9BがNiナノ構造布のSEM写真である。図9に示すように、Niを用いても、柔軟性があり、不織布の自立構造を有する無機構造体を作製することができることがわかった。
実施例12のNiナノ構造布を用いて、タンパク質(ペプチド)の分離回収を行うことを検討した。比較対象として、Niナノ粒子を用いたものを参考例1とした。Hisタグタンパク質は、CuやNi、Zn及びCoなどに吸着される特性を有する。この特性を用い、タンパク質を含む溶液に金属(構造体又は粒子)を加え、金属を除外した状態で溶液を分離することにより、目的のタンパク質を吸着した金属と、目的外タンパク質を含む溶液とを分離することができる。タンパク質の分離回収は、Hisタグを有する目的タンパク質と、Hisタグを有さない目的外タンパク質とを分離する試験を行った。図10は、無機構造体(Niナノ構造布)を用いたタンパク質の回収方法の説明図であり、図10Aがタンパク質を含む溶液中にNiナノ構造布を入れた図、図10BがNiナノ構造布を磁石で吸い寄せた図、図10Cが目的外タンパク質を含む溶液を分離する図、図10DがNiナノ構造布に新たな溶媒を加え目的タンパク質を再溶出する図である。図11は、Niナノ粒子を用いたタンパク質の回収方法の説明図であり、図11Aがタンパク質を含む溶液中にNiナノ粒子を入れた図、図11BがNiナノ粒子を磁石で吸い寄せた図、図11Cが図11Bで分離した溶液の図である。図11に示すように、Niナノ粒子を用いた場合は、目的タンパク質を吸着したNiナノ粒子を磁石を用いて除外し(図11B)、目的タンパク質をNiナノ粒子と共に回収することができる。しかしながら、分離液には、磁石に吸い寄せられないNiナノ粒子や、それに吸着した目的タンパク質も含むため、十分な分離を行うことができなかった。一方、Niナノ構造布を用いた場合は、まず、磁石を用いずにNiナノ構造布を回収することができ、更に、分離液にNiナノ粒子が残存することもなく、より簡便に、より確実に目的タンパク質を回収することができることがわかった。
実施例5と同様に、PVPを含むメタノール溶液を電界紡糸してPVP不織布を作製し、IrO2のターゲットを用いてスパッタ処理を行い、IrO2ナノ構造布を作製した。PVPを8質量%含むメタノール溶液と、PVPを16質量%含むメタノール溶液と、をそれぞれ1kV/cmの電場及び1mL/hの液供給速度で電界紡糸してPVP不織布を得た。得られたIrO2ナノ構造布をそれぞれ実施例13,14とした。図13は、水電解用のPVP8質量%ナノワイヤー不織布の繊維径分布図及びSEM写真である。図14は、水電解用のPVP16質量%ナノワイヤー不織布の繊維径分布図及びSEM写真である。PVPを8質量%含むメタノール溶液では、平均繊維径が約300nmであり、図13に示すファイバー径分布を有する不織布が得られた。また、PVPを16質量%含むメタノール溶液では、平均繊維径が約500nmであり、図14に示すファイバー径分布を有する不織布が得られた。
実施例13、14のIrO2ナノ構造布を用いて、水の電解処理を検討した。比較対象として、バルクのイリジウム金属を比較例1とした。
PVPを8質量%含むメタノール溶液を電界紡糸して作製したPVP不織布を基材として、実施例5と同様に、Cuナノ構造布、Agナノ構造布及びAg-Cuナノ構造布を作製し、それぞれを実施例15~17とした。実施例17では、Agターゲットを用いPVP不織布上にAgを形成したのち、Cuターゲットを用い、先に形成したAg上にCuを形成するという処理を3回行った(3層構造)。
実施例15~17のナノ構造布の光吸収特性を評価した。比較対象として、バルクのAg金属を比較例2とした。島津製作所製、紫外・可視・近赤外分光光度計UV-3600・ISR-3100により、200nm~850nmの波長域にて試料を測定することにより、光吸収特性を評価した。図17は、実施例15~17、比較例2のUV-Visスペクトルである。図17には、各構造布の写真を挿入した。図17に示すように、比較例2のバルクのAg金属に比べ、実施例15~17のナノ構造布は高い吸光度を示し、光吸収特性がより向上することが明らかとなった。なかでも、AgとCuとを積層堆積させて作製した実施例17のAg-Cuナノ構造布では、特に高い吸光度を示した。
次に、実施例15~17、比較例2の吸収した光を熱に変換する光熱変換特性を評価した。実施例15~17のナノ構造布及び比較例2のバルクAgに疑似太陽光を照射したときの温度をK型熱電対を用いて測定することによって、光熱変換特性を評価した。朝日分光製ソーラーシミュレーター(HAL-302)を用い、光強度1kW・m-2にて疑似太陽光照射を行った。図18は、実施例15~17、比較例2の疑似太陽光照射下における温度測定結果である。比較例2の測定結果は30℃であり、実施例15~17の測定結果は、それぞれ55℃、65℃及び73℃であった。図18に示すように、Agナノ構造布、Cuナノ構造布及びAg-Cuナノ構造布では、バルクAgに比べ高い温度を示し、Ag-Cuナノ構造布においては太陽光照射によって73℃まで加熱された。このように、ナノ構造布では、光熱変換特性がより高いことが明らかとなった。
図19に示す水蒸発量測定装置40を用いて水の蒸発速度を測定した。水蒸発量測定装置40は、ナノ構造布41と、支持体42と、収容部43と、天秤44とを備えている。ナノ構造布41は、Ag及びCuのうち1以上を含み、光を吸収し熱へ変換する光熱変換材である。支持体42は、吸水性を有すると共に断熱性を有し、第1面でナノ構造布41と接触すると共に第2面で収容部43に収容された液体と接触する部材である。ここでは、支持体42は、発泡スチロール材とした。収容部43は、上面が開放された容器であり、液体(水)を収容する。天秤44は、収容部43を載置し、収容部43の質量を測定するものである。天秤44は、メトラー・トレド製XSE205DUVとした。この水蒸発量測定装置40のナノ構造布41に光を照射すると、ナノ構造布41が光を熱に変換し、支持体42から供給される水を蒸発させる。水蒸発量測定装置40では、天秤44により経時的に質量を測定することにより、水の蒸発量を測定することができる。図20は、Ag-Cuナノ構造布である実施例17の時間に対する水蒸発量の関係図である。実施例17では、1.4kg・m-2h-1の蒸発速度が得られた。この蒸発速度は、過去に報告された文献(Sci.Adv.08 Apr 2016,Vol.2,No4,e1501227,Nature Communications volume 5, Article number: 4449 (2014),Adv.Energy Materials,Vol.8,Issue 4,Feb.5,2018,1701028,Nature Photonics volume 10, pages 393-398 (2016))による強度1kW・m-2(1sun)の太陽光照射により得られた1kg・m-2h-1の蒸発速度よりも高い値であった。また、照射された太陽光が全て水の蒸発に利用されたと仮定した理論蒸発速度は、1.39~1.47kg・m-2h-1に計算される。Ag-Cuナノ構造布は高い光熱変換特性を有することが明らかとなった。
Claims (12)
- 金属及び/又は無機材料を含む繊維体及び/又はシェルが3次元的に連結している自立構造を備え、
前記自立構造は、半チューブ型のナノワイヤーが3次元的に連結した柔軟性を有する不織布構造であり、
前記自立構造は、Pt、Au、Ag、Ru、Ir、Cu、Sn、Ni、Cr及びZnのうち1以上を含む、無機構造体。 - 前記自立構造は、(a)~(c)のうち1以上を含む、請求項1に記載の無機構造体。(a)貴金属、典型金属及び遷移金属のうちいずれかを含む金属ナノ粒子。
(b)貴金属、典型金属及び遷移金属のうち少なくとも1以上を含む合金からなる金属ナノ粒子。
(c)金属酸化物、金属硫化物、金属窒化物、金属炭化物、金属リン化物、若しくは、金属ヨウ化物からなる金属化合物ナノ粒子。 - 前記自立構造は、表面に直径が3nm以上10nm以下の前記金属及び/又は無機材料の突起構造を備えている、請求項1又は2に記載の無機構造体。
- 請求項1~3のいずれか1項に記載の無機構造体であって、
ポリマーからなり、前記自立構造の少なくとも一部を支持する支持部、を備えた無機構造体。 - 請求項1~4のいずれか1項に記載の無機構造体を触媒層、フィルタ及び導電部材のうち1以上として用いた、デバイス。
- タンパク質を選択的に回収する回収材としての請求項1~4のいずれか1項に記載の無機構造体を備え、前記無機構造体は、Cu、Ni、Zn及びCoのうち1以上を含み、Hisタグタンパク質を選択的に回収する、デバイス。
- 水を電気分解する触媒材としての、請求項1~4のいずれか1項に記載の無機構造体を備え、前記無機構造体は、Ag、Ru及びIrのうち1以上を含み、平均径が200nm以上800nm以下の範囲である、デバイス。
- 光を吸収し熱へ変換する光熱変換材としての請求項1~4のいずれか1項に記載の無機構造体を備え、前記無機構造体は、Ag及びCuのうち1以上を含む、デバイス。
- 金属及び/又は無機材料を含む繊維体及び/又はシェルが3次元的に連結している自立構造を備え、光を吸収し熱へ変換する光熱変換材としての無機構造体と、
吸水性及び断熱性を有し、第1面で前記無機構造体と接触すると共に第2面で液体と接触する支持体と、を備え、
前記無機構造体で変換された熱により前記液体を蒸発させる、デバイス。 - 光を吸収し熱へ変換する光熱変換材としての請求項1~4のいずれか1項に記載の無機構造体と、
吸水性及び断熱性を有し、第1面で前記無機構造体と接触すると共に第2面で液体と接触する支持体と、を備え、
前記無機構造体で変換された熱により前記液体を蒸発させる、デバイス。 - 溶媒に溶解可能なポリマーを含む基材表面にPt、Au、Ag、Ru、Ir、Cu、Sn、Ni、Cr及びZnのうち1以上を含む金属材料を形成することにより、前記基材表面に前記金属材料を含む繊維体及び/又はシェルが3次元的に連結している自立構造を形成する形成工程と、
前記基材の全部又は一部を溶媒に溶解させて除去する除去工程と、を含み、
前記形成工程では、前記ポリマーを含む不織布構造を有する前記基材を用い、前記基材の片面側から前記金属材料を物理蒸着させ、
前記形成工程及び前記除去工程では、前記金属としてCu、Ni、Zn及びCoのうち1以上を用い、Hisタグタンパク質を選択的に回収する前記無機構造体を作製する、
無機構造体の製造方法。 - 前記除去工程では、前記基材の一部を除去することにより、前記金属及び/又は前記無機材料を含む繊維体及び/又はシェルが3次元的に連結している自立構造の少なくとも一部を支持する支持部を形成させる、請求項11に記載の無機構造体の製造方法。
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US20110195860A1 (en) | 2008-05-04 | 2011-08-11 | University Of Maryland, College Park | Fibrous assemblies for antibody presentation, and multiplexed antigenic analysis using same |
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