JP7372239B2 - 剥離したナノ粒子を製造するための機械化学的プロセス - Google Patents
剥離したナノ粒子を製造するための機械化学的プロセス Download PDFInfo
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- JP7372239B2 JP7372239B2 JP2020523833A JP2020523833A JP7372239B2 JP 7372239 B2 JP7372239 B2 JP 7372239B2 JP 2020523833 A JP2020523833 A JP 2020523833A JP 2020523833 A JP2020523833 A JP 2020523833A JP 7372239 B2 JP7372239 B2 JP 7372239B2
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Description
-炭素質および/または鉱物ベースの材料を含む固体原料を提供するステップと、
-例えば、二酸化炭素流のような酸化ガス流を提供するステップと、
-機械的撹拌ユニットへ固体原料および酸化ガス流を入れるステップと、
-1atm(15psi)より高い圧力で機械的撹拌ユニットにおいて酸化ガスの存在下で固体原料を機械的撹拌操作に付すステップと
を含む。
-ポリマー材料の基剤樹脂の引張強度および/または引張弾性率を増大するため、
-ポリマー材料の基剤樹脂のUV耐性を増大するため、
-ポリマー材料の基剤樹脂の結晶化温度を増大するため、
-ポリマー材料の基剤樹脂の摩擦の係数を増大するため、
-例えば、ポリマー材料の基剤樹脂の表面の親水性に影響を及ぼすことによって、ポリマー材料の基剤樹脂の表面特性、従って、水または他の流体中の湿潤使用におけるポリマー材料の挙動に影響を及ぼすため、
-ポリマー材料の基剤樹脂の熱伝導度に影響を及ぼすため、
-結露、蒸気凝縮の促進および水分の空気濾過の可能性を有するナノ複合材料を製造するため、
-ガスのガス透過性を低下させるため、例えば、メタン、エタン、水素または酸素のガス透過性を低下させるため。
-癌薬物および/または治療的適用のためのRNAをロードするためのプラットフォームとしての、水溶液における長期間分散安定性を有するペプチド官能基を有するグラフェン、
-癌薬物およびRNAの両方をロードするためのプラットフォームとしての酸化グラフェン/ペプチド官能基複合体、
-細胞を成長させ、その生体適合性を研究するための酸化グラフェンベースのスキャフォールド、
-癌細胞の受容体を検出し、抗体の標的化送達を使用するための、生物学的環境における、グラフェン粒子の周囲のタンパク質コロナの同定。
-グラフェンナノ粒子、特に、導電性グラフェンナノ粒子は、水性および非水性リチウム電池システムの正極および負極への添加剤として使用できる、
-グラフェンナノ粒子またはグラフェンコーティングは、活性材料の溶解を抑制するために、ならびに/または水性および非水性リチウム電池システムの正極および負極それぞれにおけるデンドライトの核生成部位を低減するために、電極の表面に適用できる、
-酸化グラフェンフィルムをセパレーターに適用して、負極から正極へのデンドライト増殖に対するその耐性を強化できる、
-グラフェンフィルムを含む導電性集電体を、最終電池の大きさおよび重量を低減するために使用できる。グラフェンフィルムを含む導電性電流を、グラファイトペーパーの厚い部分を含む、または導電性ポリマーフィルムを含む市販の集電体と置き換えることができる。
特に、例えば、金属配合高密度ポリエチレン(HDPE)のようなポリマー材料における増量剤としてのGNP(グラフェンナノプレートレット)およびGO(酸化グラフェン)のナノ粒子の添加の有効性を以下に例示する。GNPの添加を伴うHDPEは、HDPE-GNPと呼ばれ、GOの添加を伴うHDPEは、HDPE-GOと呼ばれる。
Quanta FEG 250 ESEM (FEI)を備えた走査電子顕微鏡(SEM)によって、HDPE-GNPおよびHDPE-GO複合体の形態学的特性決定を実施した。液体窒素破砕によってイメージングのためのきれいな断面図を製造し、続いて、SEMイメージングの際の電荷蓄積を防ぐために白金を用いてスパッタコーティングした。HDPE-GNEおよびHDPE-GO複合体のSEM顕微鏡写真によって、ポリマーマトリックス中の充填剤の分散の程度を確認することが可能であり、凝集体を検出することが可能である。
複合体の機械的特性を、一軸性張力試験および動的機械的試験(DMA)の両方によって試験した。張力試験は、Microtester 5848(Instron)を用い、ASTM D638に従って実施した。インジェクション成形ドッグボーンサンプルは、ASTM標準によって指定されるようなIV型のものとした。次いで、不具合または機械がその物理的限界に達するまで、50mm/分の速度で、サンプルに一軸性張力で負荷をかけた。各組成物について7サンプルを試験し、そのヤング率、ピーク応力、弾性の係数および破壊時の伸長歪みを算出し、分析した。DMA試験は、DMA Q800(TA Instruments)を用いて実施し、これでは、薄い矩形のビームサンプルがデュアルカンチレバー固定具中にロードされ、サイクリック3点曲げ試験に付された。サンプルを、35℃で3つの異なる振動振幅(30、60および120μm)で0から60Hzまで線形周波数掃引で試験した。この試験から、その貯蔵弾性率、損失弾性率および損失正接を得ることができた。
2種の複合体の結晶化および融解特徴を、示差走査熱量測定(DSC)によって調べた。具体的には、DSC Q2000(TA Instruments)を利用し、すべて10℃/分の速度で周囲室温(22℃)から180℃へ、-40℃へ低下させ、180℃に戻す熱-冷-熱サイクルによって複合体サンプルを流した。サンプルは、10~12mgの質量の範囲の複合体の薄片からなっていた。
毒性研究において種々のグラフェン誘導体を比較した。標的細胞としてHCT116、結腸癌細胞系統を選択した。これらの細胞を、種々の濃度のいくつかのグラフェン誘導体、特に、酸化グラフェンナノリボン(GONR)、還元型酸化グラフェン(RGO)、本発明のナノ粒子から製造された(酸処理法を使用して)酸化グラフェン(GO)、10%CO2を取り込んだ製粉グラファイトおよび酸化グラフェンナノキャップ(GONC)とともにインキュベートした。これらの誘導体は、大きさ、構造および表面官能性が異なっている。結果は、すべてのグラフェンサンプルが、細胞培地中のその濃度(μg/mL)を増大することによって、細胞に対してより毒性(より少ない生存率%)になることを示す。しかし、GOサンプルは、極めて高い濃度(400~500μg/mL)で細胞事象に対して最小毒性影響しか示さなかった。文献に報告された通常の酸化グラフェン種は、200μg/mLの低濃度でさえ毒性であると同定されているが、この独特のGOは、最低毒性しか示さず、これは、生物医学的適用にとって多数の可能性を提供する。この独特のGOは、製粉グラファイト(10%)の化学的処理によって得られた。
ゼータ電位は、粒子間の静電的または電荷的反発/誘引の規模の尺度であり、安定性に影響を及ぼすと知られている基本的なパラメータの1つである。実際には、界面から離れたバルク流体中の点に対する滑り面の位置の界面二重層(DL)における電位である。言い換えれば、ゼータ電位は、分散媒と、分散粒子に付着した流体の静止層の間の電位差である。その測定は、分散、凝集または凝結の原因に詳細な考えをもたらし、分散物、エマルジョンおよび懸濁液の形成を改善するために適用できる。以下の表2は、異なる大きさ、構造および官能性を有する広範囲のグラフェン誘導体のゼータ電位値を示す。本発明のナノ粒子から製造した(酸処理プロセスを使用して)GO、酸化グラフェンは、-52mVのゼータ電位を有し、最高分散安定性を有し、RGOは、最低安定性を有し、-22mVのゼータ電位を有する。
Claims (9)
- 剥離したナノ粒子を製造するための機械化学的方法であって、
-炭素質材料、鉱物ベースの材料、および/または、非晶質粉末を含む固体原料を提供するステップと、
-酸化ガス流(ただし、空気を除く。)を提供するステップと、
-機械的撹拌ユニットへ固体原料および前記酸化ガス流(ただし、空気を除く。)を入れるステップと、
-少なくとも1atm(15psi)の圧力で前記機械的撹拌ユニットにおいて前記酸化ガス(ただし、空気を除く。)の存在下で前記固体原料の材料を機械的撹拌操作に付すステップと、を含み、
前記固体原料への触媒の添加をさらに含み、
前記触媒が、金属酸化物を含む、機械化学的方法。 - 前記炭素質材料が、以下の材料、フライアッシュ、ボトムアッシュ、焼却炉灰、グラファイト、石油コークス、無煙炭、瀝青炭、活性炭およびそれらの組合せのうち少なくとも1種を含む、請求項1に記載の機械化学的方法。
- 前記鉱物ベースの材料が、以下の材料、橄欖石、タルク、蛇紋石、およびそれらの組合せのうち少なくとも1種を含む、請求項1に記載の機械化学的方法。
- 前記酸化ガス(ただし、空気を除く。)が、酸素、二酸化硫黄、二酸化窒素、二酸化炭素およびそれらの組合せからなる群から選択されるガスを含む、請求項1に記載の機械化学的方法。
- 前記機械的撹拌操作が、混合、撹拌、剪断、振盪、ブレンドまたは超音波処理を含む、請求項1に記載の機械化学的方法。
- 前記酸化ガス(ただし、空気を除く。)が、二酸化炭素を含む、請求項4に記載の機械化学的方法。
- 前記触媒が、酸化鉄、酸化コバルト、酸化レニウム、酸化チタンおよびそれらの組合せからなる群から選択される金属酸化物を含む、請求項1に記載の機械化学的方法。
- 少なくとも1種の挿入剤を導入するステップをさらに含む、請求項1に記載の機械化学的方法。
- 前記挿入剤が、塩酸、硫酸、硝酸およびそれらの組合せからなる群から選択される酸を含む、請求項8に記載の機械化学的方法。
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JP2020527534A (ja) | 2020-09-10 |
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