著者らは、Rutgers大学のThomas J. Emge博士とWei Liu博士に、小角X線回折と粉末X線回折の分析と専門知識について高く評価しています。さらに、著者らは、N 2吸着実験でのHao Wangの支持について認めている。

1.Al（OH） 3ナノ粒子合成<ol><li> 1.40gの塩化アルミニウム六水和物を5.822gの脱イオン水に溶解する。 </li><li>磁気撹拌しながら、2.778gのL-アルギニンを塩化アルミニウム水溶液に添加する。添加されたアルギニンが溶解し、大きな塊または塊を形成しないように、L-アルギニンをゆっくりと添加する。さらに、ゆっくりと添加すると、局所的なアルカリ濃度が低下し、より制御しやすい加水分解のための条件が提供される。 </li><li>すべてのアルギニンが溶液に溶解したら、溶液を50℃で72時間加熱します。この時点で、ソリューションは曇ったサスペンションとして表示されることがあります。 </li></ol> 2.Al（OH） 3をNaClで析出させる<ol><li>直径49インチ、長さ1.125のGPCカラムを準備する。ゲルを添加し、水をカラムに通して適切な充填を確実にするために、ゲルビーズ間の空間を最小限にして、ゲルを連続的にパックする。パックゲルからカラムの約80％まで;パックされたゲルの量は毎回変化し、分離した種の保持時間にのみ影響する。 </li><li> 10mL注入器ループを備えたHPLCポンプを用いて、10mLの合成されたままのAl（OH） 3ナノ粒子懸濁液（ステップ1.3で調製）をカラムに導入する。チューブの外径が約0.125インチで、注入されたサンプルを10mL送達するように校正されたチューブを使用してインジェクタループをカスタム化します。 </li><li> dRIのピーク位置に相関する間隔でカラム溶出を収集する。 GPC出力を示差屈折率（dRI）検出器の入力に接続します。 注：分離された種はGPCから出てくるので、ピークとしてdRI検出器に現れ、その後125mLボトルに集められます。 GPCカラムは、2つのよく分離されたピークを生成し、それらは両方とも集められ、サイズ排除クロマトグラフィー（SEC）および元素分析（EA）によって分析され、アルギニンをアルミニウムスピンから区別するcies。収集される全容積は、GPCカラムのサイズ、使用される充填材料の総量、およびカラムを溶出するために使用される脱イオン水の流速に依存する。 <ol><li> 0.2mL /分の流速で100分かけてピーク1画分の大部分を集める。 </li><li> GPCカラムのRI検出器にピークが現れたら、30分間隔で溶離液を集める。 注：間隔の範囲を変更すると、結果として得られる精製されたピーク1物質の濃度と純度が変わります。最初にピークの小さな間隔を収集して、特定のカラムについてピーク1種の最高濃度と純度を含む部分を決定する方が良いです。 </li></ol></li><li> 1重量％のNaClを調製する。 </li><li>調製したNaCl溶液を10mLの精製Al（OH） 3ナノ粒子に滴下して加える。 NaCl沈殿を用いて調製した材料は、さらなる実験に使用しない。 </li></ol> Al-MCM-41の調製<ol><li> Ac約1.0gのMCM-41を真空オーブン中で120℃、3時間真空下で揺動させる。 </li><li> 9.6926gのAlCl 3・6H 2 Oを40.3074gの脱イオン水と混合することにより50.0gの塩化アルミニウム溶液を調製する。 </li><li> 0.7gの活性化MCM-41を50.0gの塩化アルミニウム溶液（工程3.2で調製）に加える。 </li><li> MCM-41チャンネル全体に拡散したAlCl 3の均質性を確実にするために、適切な混合時間（1時間）を与えます。 </li><li>磁気撹拌下で、L-アルギニンを2.75のArg / Alモル比に異種混合物に添加する。工程1.2と同様に、瞬時に形成された凝集物を再溶解させ、添加を続ける前にアルギニンの凝集を減少させるのに十分なほどゆっくりとアルギニンを添加する。 </li><li>均質になったら、混合物を50℃で72時間加熱する。 </li><li>得られた不均質溶液をブフナー漏斗を用いて真空下で濾過し、定性的な90mm濾紙円（または任意の他の適切なろ紙）。 </li><li>ろ過した白色粉末を過剰の脱イオン水で洗浄して、生成したAl-MCM-41材料から未反応の塩化アルミニウム、アルギニンまたは水溶性副生成物を確実に除去する。 </li></ol>

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著者は何も開示することはない。

塩化アルミニウム水溶液の調製には、塩化アルミニウムの結晶六水和物塩の使用が必要であった。無水形態も使用することができるが、重要な吸湿特性のために好ましくない。そのため、アルミニウムの濃度を制御したり、アルミニウムの濃度を制御することが困難になる。時間の経過とともに、[Al（H 2 O） 6 ] 3+アクア酸が加水分解して最終的に全体の収率および最?...

水酸化アルミニウムで作られた材料は、触媒、医薬品、水処理、化粧品を含む様々な産業用途の有望な候補である。 1,2,3,4 高温では、水酸化アルミニウムは分解中に相当量の熱を吸収してアルミナ（Al 2 O 3 ）を生成し、それを有用な難燃剤にする。水酸化アルミニウムの4つの既知の多形体（ すなわち 、ギブサイト、バイエライト、ノードストランダイト、およびドイライト）は、それらの形成および構造に関する我々の理解を改善するために、計算および実験技術を用いて研究されている6 。ナノスケールの粒子の調製は、量子効果およびそれらの特性とは異なる特性を示す可能性があるため、特に重要であるrバルクカウンターパート。 100nmのオーダの寸法を有するナノギブサイト粒子は、様々な条件7,8,9,10,11,12,13,14で容易に調製される。 粒径をさらに小さくすることに伴う固有の課題を克服することはさらに困難である。したがって、ナノギブサイト粒子が50nm程度の寸法を有する場合はごくわずかである。私たちの知る限りでは、50nmより小さいナノギブサイトの報告はありませんでした。部分的には、これは、ナノ粒子が静電的不安定性のために凝集する傾向があるという事実に起因するコロイド粒子間、特に極性プロトン性溶媒中での水素結合の形成の可能性が高い。私たちの目的は、安全な成分と前駆物質だけを使って小さなAl（OH） 3ナノ粒子を合成することでした。現在の研究では、緩衝液および安定剤としてアミノ酸（ すなわち 、L-アルギニン）を組み込むことによって、水性粒子凝集が阻害された。さらに、グアニジニウム含有アルギニンは水酸化アルミニウム粒子の成長および凝集を防止し、平均粒径が10〜30nmのコロイド懸濁液を生成することが報告されている。ここでアルギニンの両性および双性イオン性の性質は、30nmを超える粒子成長を不快にする穏やかな加水分解の間に水酸化アルミニウムナノ粒子の表面電荷を緩和することが提案されている。アルギニンは10nm未満の粒子サイズを減少させることができなかったが、このような粒子は、「ケージ」閉じ込め効果を利用して達成されたMCM-41のメソ細孔内に存在する。 Al-MCM-41複合材料のキャラクタリゼーションは、平均孔径2.7nmを有するメソポーラスシリカ内の超微細水酸化アルミニウムナノ粒子を明らかにした。

<table><tbody><tr><td>aluminum chloride hexahydrate</td><td>Alfa Aesar</td><td>12297</td><td></td></tr><tr><td>L-arginine</td><td>BioKyowa</td><td>N/A</td><td></td></tr><tr><td>aluminum hydroxide</td><td>Sigma Aldrich</td><td>239186</td><td></td></tr><tr><td>Bio-Gel P-4 Gel</td><td>Bio-Rad</td><td>150-4128</td><td></td></tr><tr><td>Mesoporous siica (MCM-41 type)</td><td>Sigma Aldrich</td><td>643645</td><td></td></tr></tbody></table>

facile preparation of ultrafine aluminum hydroxide particles with or without mesoporous mcm-41 in ambient environments

ナノギブサイトの水性懸濁液を、L-アルギニンとpH6.6のアルミニウムアクア酸[Al（H 2 O） 6 ] 3+の滴定によって合成した。水性アルミニウム塩の加水分解は広範囲のサイズ分布を有する幅広い製品を生成することが知られているので、種々の最先端装置（ すなわち 27 Al / 1 H NMR、FTIR、ICP-OES 、TEM-EDX、XPS、XRD、およびBET）を使用して、合成生成物および副産物の同定を特徴付けた。ゲル透過クロマトグラフィー（GPC）カラム技術を用いてナノ粒子（10〜30nm）からなる生成物を単離した。フーリエ変換赤外（FTIR）分光法および粉末X線回折（PXRD）は、精製材料を水酸化アルミニウムのギブサイト多形体であると同定した。無機塩（ 例えば 、NaCl）の添加は、懸濁液の静電的不安定化を誘導し、それによってナノ粒子を凝集させて大粒径のAl（OH） 3沈殿物。本明細書に記載の新規な合成方法を利用することにより、Al（OH） 3は、MCM-41の高度に秩序化されたメソポーラス骨格内部に部分的に充填され、平均孔寸法は2.7nmであり、八面体および四面体Al（Oh / T d = 1.4）。エネルギー分散型X線分光分析（EDX）を用いて測定した総Al含有量は11％w / wであり、Si / Alモル比は2.9であった。バルクEDXと表面X線光電子分光法（XPS）元素分析とを比較することにより、アルミノケイ酸塩材料内のAlの分布についての洞察が得られた。さらに、バルク（2.9）と比較して、Si / Alの高い比が外部表面（3.6）で観察された。 O / Al比の近似は、それぞれコアおよび外部表面近くのAl（O） 3およびAl（O） 4基のより高い濃度を示唆している。新たに開発されたAl-MCM-41の合成は、Al 2 O 3ナノ粒子が有利である用途に使用することができる。

Nanogibbsite Synthesis ナノギブサイトは、AlCl 3・6H 2 O（14重量％）をL-アルギニンで滴定し、最終Arg / Alモル比が2.75になるように調製した。ナノギブサイト粒子の合成は、部分的に加水分解された塩化アルミニウム溶液のために広く使用されている分析技術であるSECを介してモニターされ、ピーク1,2,3,4およ...

Watch this Scientific Journal Video about Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments at JoVE.com

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

超微細水酸化アルミニウムナノ粒子懸濁液を、MCM-41のメソポーラスチャンネル内にケージ効果閉じ込めを伴うかまたは伴わないで、L-アルギニンを用いた[Al（H 2 O）] 3+の pHを4.6に制御滴定することによって調製した。

周囲環境におけるメソ多孔性MCM-41を有するまたは含まない超微粒水酸化アルミニウム粒子の容易な調製

An aqueous suspension of nanogibbsite was synthesized via the titration of aluminum aqua acid [Al(H2O)6]3+ with L-arginine to pH 4.6. Since the hydrolysis ...

facile-preparation-ultrafine-aluminum-hydroxide-particles-with-or

Universidad de Cartagena UDEC

Research

JoVE Journal

Chemistry

10.8K ビュー.  Colgate-Palmolive Company. 超微細水酸化アルミニウムナノ粒子懸濁液を、MCM-41のメソポーラスチャンネル内にケージ効果閉じ込めを伴うかまたは伴わないで、L-アルギニンを用いた[Al（H 2 O）] 3+の pHを4.6に制御滴定することによって調製した。 

ビデオ: Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Preparation of Silica Nanoparticles Through Microwave-assisted Acid-catalysis

Microwave-assisted synthetic techniques were used to quickly and reproducibly produce silica nanoparticle sols using an acid catalyst with nanoparticle diameters ranging from 30-250 nm by varying the reaction conditions. Through the selection of a microwave compatible solvent, silicic acid precursor, catalyst, and microwave irradiation time, these microwave-assisted methods were capable of overcoming the previously reported shortcomings associated with synthesis of silica nanoparticles using microwave reactors. The siloxane precursor was hydrolyzed using the acid catalyst, HCl. Acetone, a low-tan &#948; solvent, mediates the condensation reactions and has minimal interaction with the electromagnetic field. Condensation reactions begin when the silicic acid precursor couples with the microwave radiation, leading to silica nanoparticle sol formation. The silica nanoparticles were characterized by dynamic light scattering data and scanning electron microscopy, which show the materials&#39; morphology and size to be dependent on the reaction conditions. Microwave-assisted reactions produce silica nanoparticles with roughened textured surfaces that are atypical for silica sols produced by St&#246;ber&#39;s methods, which have smooth surfaces.

Silica nanoparticles were prepared using acid-catalysis of a siloxane precursor and microwave-assisted synthetic techniques resulting in the controlled growth of nanomaterials ranging from 30-250 nm in diameter. The growth dynamics can be controlled by varying the initial silicic acid concentration, time of the reaction, and temperature of reaction.

マイクロ波支援酸 - 触媒反応によりシリカナノ粒子の調製

Microwave-assisted synthetic techniques were used to quickly and reproducibly produce silica nanoparticle sols using an acid catalyst with nanoparticle ...

化学

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

Plasma enhanced chemical vapor deposition (PECVD) of perfluoroalkanes has long been studied for tuning the wetting properties of surfaces. For high surface area microporous materials, such as metal-organic frameworks (MOFs), unique challenges present themselves for PECVD treatments. Herein the protocol for development of a MOF that was previously unstable to humid conditions is presented. The protocol describes the synthesis of Cu-BTC (also known as HKUST-1), the treatment of Cu-BTC with PECVD of perfluoroalkanes, the aging of materials under humid conditions, and the subsequent ammonia microbreakthrough experiments on milligram quantities of microporous materials. Cu-BTC has an extremely high surface area (~1,800 m2/g) when compared to most materials or surfaces that have been previously treated by PECVD methods. Parameters such as chamber pressure and treatment time are extremely important to ensure the perfluoroalkane plasma penetrates to and reacts with the inner MOF surfaces. Furthermore, the protocol for ammonia microbreakthrough experiments set forth here can be utilized for a variety of test gases and microporous materials.

Herein the procedures for plasma enhanced chemical vapor deposition of perfluoroalkanes on microporous materials such as metal-organic frameworks to enhance their stability and hydrophobicity are described. Furthermore, breakthrough testing of milligram quantities of samples is described in detail.

プラズマを介した疎水性有機金属フレームワークの製造は、アンモニアの除去のためにペルフルオロアルカンの化学的気相成長法を強化

Plasma enhanced chemical vapor deposition (PECVD) of perfluoroalkanes has long been studied for tuning the wetting properties of surfaces. For high ...

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

In recent years &pi;-conjugated organic semiconductors have emerged as the active material in a number of diverse applications including large-area, low-cost displays, photovoltaics, printable and flexible electronics and organic spin valves. Organics allow (a) low-cost, low-temperature processing and (b) molecular-level design of electronic, optical and spin transport characteristics. Such features are not readily available for mainstream inorganic semiconductors, which have enabled organics to carve a niche in the silicon-dominated electronics market. The first generation of organic-based devices has focused on thin film geometries, grown by physical vapor deposition or solution processing. However, it has been realized that organic nanostructures can be used to enhance performance of above-mentioned applications and significant effort has been invested in exploring methods for organic nanostructure fabrication.	
A particularly interesting class of organic nanostructures is the one in which vertically oriented organic nanowires, nanorods or nanotubes are organized in a well-regimented, high-density array. Such structures are highly versatile and are ideal morphological architectures for various applications such as chemical sensors, split-dipole nanoantennas, photovoltaic devices with radially heterostructured "core-shell" nanowires, and memory devices with a cross-point geometry. Such architecture is generally realized by a template-directed approach. In the past this method has been used to grow metal and inorganic semiconductor nanowire arrays. More recently &pi;-conjugated polymer nanowires have been grown within nanoporous templates. However, these approaches have had limited success in growing nanowires of technologically important &pi;-conjugated small molecular weight organics, such as tris-8-hydroxyquinoline aluminum (Alq3), rubrene and methanofullerenes, which are commonly used in diverse areas including organic displays, photovoltaics, thin film transistors and spintronics.	
Recently we have been able to address the above-mentioned issue by employing a novel "centrifugation-assisted" approach. This method therefore broadens the spectrum of organic materials that can be patterned in a vertically ordered nanowire array. Due to the technological importance of Alq3, rubrene and methanofullerenes, our method can be used to explore how the nanostructuring of these materials affects the performance of aforementioned organic devices. The purpose of this article is to describe the technical details of the above-mentioned protocol, demonstrate how this process can be extended to grow small-molecular organic nanowires on arbitrary substrates and finally, to discuss the critical steps, limitations, possible modifications, trouble-shooting and future applications.

We report a simple method for fabricating an ultrahigh density array of vertically ordered small-molecular organic nanowires. This method allows for synthesis of complex heterostructured hybrid nanowire geometries, which can be inexpensively grown on arbitrary substrates. These structures have potential applications in organic electronics, optoelectronics, chemical sensing, photovoltaics and spintronics.

任意の基板上の垂直配向小分子有機ナノワイヤーの超高密度アレイ

In  recent years &pi;-conjugated  organic semiconductors have emerged as the active material in a number of  diverse applications including large-area, ...

工学

Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

A reverse microemulsion is used to encapsulate monometallic or bimetallic early transition metal oxide nanoparticles in microporous silica shells. The silica-encapsulated metal oxide nanoparticles are then carburized in a methane/hydrogen atmosphere at temperatures over 800 &#176;C to form silica-encapsulated early transition metal carbide nanoparticles. During the carburization process, the silica shells prevent the sintering of adjacent carbide nanoparticles while also preventing the deposition of excess surface carbon. Alternatively, the silica-encapsulated metal oxide nanoparticles can be nitridized in an ammonia atmosphere at temperatures over 800 &#176;C to form silica-encapsulated early transition metal nitride nanoparticles. By adjusting the reverse microemulsion parameters, the thickness of the silica shells, and the carburization/nitridation conditions, the transition metal carbide or nitride nanoparticles can be tuned to various sizes, compositions, and crystal phases. After carburization or nitridation, the silica shells are then removed using either a room-temperature aqueous ammonium bifluoride solution or a 0.1 to 0.5 M NaOH solution at 40-60 &#176;C. While the silica shells are dissolving, a high surface area support, such as carbon black, can be added to these solutions to obtain supported early transition metal carbide or nitride nanoparticles. If no high surface area support is added, then the nanoparticles can be stored as a nanodispersion or centrifuged to obtain a nanopowder.

A &#8220;removable ceramic coating method&#8221; is presented in visual format for the synthesis of non-sintered and metal-terminated monometallic and bimetallic early transition metal carbide and nitride nanoparticles with tunable sizes and crystal structures.

モノとバイメタル早期遷移金属炭化物と窒化物ナノ粒子の逆マイクロエマルジョン媒介合成

A reverse microemulsion is used to encapsulate monometallic or bimetallic early transition metal oxide nanoparticles in microporous silica shells. The ...

Experimental Protocol to Investigate Particle Aerosolization of a Product Under Abrasion and Under Environmental Weathering

The present article presents an experimental protocol to investigate particle aerosolization of a product under abrasion and under environmental weathering, which is a fundamental element to the approach of nanosafety-by-design of nanostructured products for their durable development. This approach is basically a preemptive one in which the focus is put on minimizing the emission of engineered nanomaterials' aerosols during the usage phase of the product's life cycle. This can be attained by altering its material properties during its design phase without compromising with any of its added benefits. In this article, an experimental protocol is presented to investigate the nanosafety-by-design of three commercial nanostructured products with respect to their mechanical solicitation and environmental weathering. The means chosen for applying the mechanical solicitation is an abrasion process and for the environmental weathering, it is an accelerated UV exposure in the presence of humidity and heat. The eventual emission of engineered nanomaterials is studied in terms of their number concentration, size distribution, morphology and chemical composition. The purpose of the protocol is to study the emission for test samples and experimental conditions which are corresponding to real life situations. It was found that the application of the mechanical stresses alone emits the engineered nanomaterials' aerosols in which the engineered nanomaterial is always embedded inside the product matrix, thus, a representative product element. In such a case, the emitted aerosols comprise of both nanoparticles as well as microparticles. But if the mechanical stresses are coupled with the environmental weathering, the experimental protocol reveals then the eventual deterioration of the product, after a certain weathering duration, may lead to the emission of the free engineered nanomaterial aerosols too.

In this article, an experimental protocol to investigate particle aerosolization of a product under abrasion and under environmental weathering is presented. Results on the emission of engineered nanomaterials, in the form of aerosols are presented. The specific experimental set-up is described in detail.

摩耗の下で環境風化の下で製品の粒子エアロゾル化を調査するための実験プロトコール

The present article presents an experimental protocol to investigate particle aerosolization of a product under abrasion and under environmental ...

Nanothermite with Meringue-like Morphology: From Loose Powder to Ultra-porous Objects

The goal of the protocol described in this article is to prepare aluminothermic compositions (nanothermites) in the form of porous, monolithic objects. Nanothermites are combustible materials made up of inorganic fuel and an oxidizer. In nanothermite foams, aluminum is the fuel and aluminum phosphate and tungsten trioxide are the oxidizing moieties. The highest flame propagation velocities (FPVs) in nanothermites are observed in loose powders and FPVs are strongly decreased by pelletizing nanothermite powders. From a physical standpoint, nanothermite loose powders are metastable systems. Their properties can be altered by unintentional compaction induced by shocks or vibrations or by the segregation of particles over time by settling phenomena, which originates from the density differences of their components. Moving from a powder to an object is the challenge that must be overcome to integrate nanothermites in pyrotechnic systems. Nanothermite objects must have both a high open porosity and good mechanical strength. Nanothermite foams meet both of these criteria, and they are prepared by dispersing a nano-sized aluminothermic mixture (Al/WO3) in orthophosphoric acid. The reaction of aluminum with the acid solution gives the AlPO4 &#34;cement&#34; in which Al and WO3 nanoparticles are embedded. In nanothermite foams, aluminum phosphate plays the dual role of binder and oxidizer. This method can be used with tungsten trioxide, which is not altered by the preparation process. It could probably be extended to some oxides, which are commonly used for the preparation of high performance nanothermites. The WO3-based nanothermite foams described in this article are particularly insensitive to impact and friction, which makes them far safer to handle than loose Al/WO3 powder. The fast combustion of these materials has interesting applications in pyrotechnic igniters. Their use in detonators as primers would require the incorporation of a secondary explosive in their composition.

This manuscript describes the synthesis of combustible aluminophosphate matrices by the reaction of orthophosphoric acid (H3PO4) with aluminum nanopowder. When this reaction is carried out with excess aluminum in the presence of tungsten trioxide nanopowder, it leads to a solid, porous nanothermite foam.

メレンゲのような形態と Nanothermite: 超多孔質オブジェクトにルース パウダーから

The goal of the protocol described in this article is to prepare aluminothermic compositions (nanothermites) in the form of porous, monolithic objects. ...

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

After reporting on the two-step anodization, nanoporous anodic aluminum oxides (AAOs) have been widely utilized in the versatile fields of fundamental sciences and industrial applications owing to their periodic arrangement of nanopores with relatively high aspect ratio. However, the techniques reported so far, which could be only valid for mono-surface anodization, show critical disadvantages, i.e., time-consuming as well as complicated procedures, requiring toxic chemicals, and wasting valuable natural resources. In this paper, we demonstrate a facile, efficient, and environmentally clean method to fabricate nanoporous AAOs in sulfuric and oxalic acid electrolytes, which can overcome the limitations that result from conventional AAO fabricating methods. First, plural AAOs are produced at one time through simultaneous multi-surfaces anodization (SMSA), indicating mass-producibility of the AAOs with comparable qualities. Second, those AAOs can be separated from the aluminum (Al) substrate by applying stair-like reverse biases (SRBs) in the same electrolyte used for the SMSAs, implying simplicity and green technological characteristics. Finally, a unit sequence consisting of the SMSAs sequentially combined with SRBs-based detachment can be applied repeatedly to the same Al substrate, which reinforces the advantages of this strategy and also guarantees the efficient usage of natural resources.

A protocol for fabricating nanoporous anodic aluminum oxides via simultaneous multi-surfaces anodization followed by stair-like reverse biases detachments is presented. It can be applied repeatedly to the same aluminum substrate, exhibiting a facile, high-yield, and environmentally clean strategy.

同時マルチ表面 Anodizations、階段のような逆バイアスで硫酸陽極酸化アルミニウムとシュウ酸電解質の剥離

After reporting on the two-step anodization, nanoporous anodic aluminum oxides (AAOs) have been widely utilized in the versatile fields of fundamental ...

Fabrication and Testing of Catalytic Aerogels Prepared Via Rapid Supercritical Extraction

Protocols for preparing and testing catalytic aerogels by incorporating metal species into silica and alumina aerogel platforms are presented. Three preparation methods are described: (a) the incorporation of metal salts into silica or alumina wet gels using an impregnation method; (b) the incorporation of metal salts into alumina wet gels using a co-precursor method; and (c) the addition of metal nanoparticles directly into a silica aerogel precursor mixture. The methods utilize a hydraulic hot press, which allows for rapid (&#60;6 h) supercritical extraction and results in aerogels of low density (0.10 g/mL) and high surface area (200-800 m2/g). While the work presented here focuses on the use of copper salts and copper nanoparticles, the approach can be implemented using other metal salts and nanoparticles. A protocol for testing the three-way catalytic ability of these aerogels for automotive pollution mitigation is also presented. This technique uses custom-built equipment, the Union Catalytic Testbed (UCAT), in which a simulated exhaust mixture is passed over an aerogel sample at a controlled temperature and flow rate. The system is capable of measuring the ability of the catalytic aerogels, under both oxidizing and reducing conditions, to convert CO, NO and unburned hydrocarbons (HCs) to less harmful species (CO2, H2O and N2). Example catalytic results are presented for the aerogels described.

Here we present protocols for preparing and testing catalytic aerogels by incorporating metal species into silica and alumina aerogel platforms. Methods for preparing materials using copper salts and copper-containing nanoparticles are featured. Catalytic testing protocols demonstrate the effectiveness of these aerogels for three-way catalysis applications.

急速な超臨界抽出法によって作製した触媒のエアロゲルの作製と試験

Protocols for preparing and testing catalytic aerogels by incorporating metal species into silica and alumina aerogel platforms are presented. Three ...

Solvothermal Synthesis of MIL-96 and UiO-66-NH2 on Atomic Layer Deposited Metal Oxide Coatings on Fiber Mats

Metal-organic frameworks (MOFs), which contain reactive metal clusters and organic ligands allowing for large porosities and surface areas, have proven effective in gas adsorption, separations, and catalysis. MOFs are most commonly synthesized as bulk powder, requiring additional processes to adhere them to functional devices and fabrics that risk decreasing the powder porosity and adsorption capacity. Here, we demonstrate a method of first coating fabrics with metal oxide films using atomic layer deposition (ALD). This process creates conformal films of controllable thickness on each fiber, while providing a more reactive surface for MOF nucleation. By submerging the ALD coated fabric in solution during solvothermal MOF synthesis, the MOFs create a conformal, well-adhered coating on the fibers, resulting in a MOF-functionalized fabric, without additional adhesion materials that may block MOF pores and functional sites. Here we demonstrate two solvothermal synthesis methods. First, we form a MIL-96(Al) layer on polypropylene fibers using synthetic conditions that convert the metal oxide to MOF. Using initial inorganic films of varying thicknesses, diffusion of the organic linker into the inorganic allows us to control the extent of MOF loading on the fabric. Second, we perform a solvothermal synthesis of UiO-66-NH2 in which the MOF nucleates on the conformal metal oxide coating on polyamide-6 (PA-6) fibers, thereby producing a uniform and conformal thin film of MOF on the fabric. The resulting materials can be directly incorporated into filter devices or protective clothing and eliminate the maladroit qualities of loose powder.

Solvothermal Synthesis of MIL-96 and UiO-66-NH2 on Atomic Layer Deposited Metal Oxide Coatings on Fiber Mats

Metal-organic frameworks are effective in gas storage and heterogeneous catalysis, but typical synthesis methods result in loose powders that are difficult to incorporate into smart materials. We demonstrate a method of first coating fabrics with ALD metal oxides, resulting in conformal films of MOF on the fabrics during solvothermal synthesis.

ミル-96、UiO-66-NH2原子層のソルボサーマル合成繊維のマット上金属酸化皮膜に堆積

Metal-organic frameworks (MOFs), which contain reactive metal clusters and organic ligands allowing for large porosities and surface areas, have proven ...

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

We report the synthesis of thin, highly intergrown, polycrystalline metal-organic framework (MOF) membranes on a wide range of unmodified porous and non-porous supports (polymer, ceramic, metal, carbon, and graphene). We developed a novel crystallization technique, which is termed the ENACT approach: the electrophoretic nuclei assembly for the crystallization of highly intergrown thin films (ENACT). This approach allows for a high density of heterogeneous nucleation of MOFs on a chosen substrate via the electrophoretic deposition (EPD) directly from the precursor sol. The growth of well-packed MOF nuclei leads to a highly intergrown polycrystalline MOF film. We show that this simple approach can be used for the synthesis of thin, intergrown zeolite imidazole framework (ZIF)-7 and ZIF-8 films. The resulting 500 nm-thick ZIF-8 membranes show a considerably high H2 permeance (8.3 x 10-6 mol m-2 s-1 Pa-1) and ideal gas selectivities (7.3 for H2/CO2, 15.5 for H2/N2, 16.2 for H2/CH4, and 2655 for H2/C3H8). An attractive performance for C3H6/C3H8 separation is also achieved (a C3H6 permeance of 9.9 x 10-8 mol m-2 s-1 Pa-1 and a C3H6/C3H8 ideal selectivity of 31.6 at 25 &#176;C). Overall, the ENACT process, owing to its simplicity, can be extended to synthesize intergrown thin films of a wide range of nanoporous crystalline materials.

A simple, reproducible, and versatile approach for the synthesis of intergrown, polycrystalline metal-organic framework membranes on a wide range of unmodified porous and non-porous supports is presented.

極薄高性能金属有機性フレームワーク膜の電気泳動の結晶化

We report the synthesis of thin, highly intergrown, polycrystalline metal-organic framework (MOF) membranes on a wide range of unmodified porous and ...

周囲環境におけるメソ多孔性MCM-41を有するまたは含まない超微粒水酸化アルミニウム粒子の容易な調製

要約

さらに動画を探す

この動画の章

マイクロ波支援酸 - 触媒反応によりシリカナノ粒子の調製

プラズマを介した疎水性有機金属フレームワークの製造は、アンモニアの除去のためにペルフルオロアルカンの化学的気相成長法を強化

任意の基板上の垂直配向小分子有機ナノワイヤーの超高密度アレイ

モノとバイメタル早期遷移金属炭化物と窒化物ナノ粒子の逆マイクロエマルジョン媒介合成

摩耗の下で環境風化の下で製品の粒子エアロゾル化を調査するための実験プロトコール

メレンゲのような形態と Nanothermite: 超多孔質オブジェクトにルースパウダーから

同時マルチ表面 Anodizations、階段のような逆バイアスで硫酸陽極酸化アルミニウムとシュウ酸電解質の剥離

急速な超臨界抽出法によって作製した触媒のエアロゲルの作製と試験

ミル-96、UiO-66-NH₂原子層のソルボサーマル合成繊維のマット上金属酸化皮膜に堆積

極薄高性能金属有機性フレームワーク膜の電気泳動の結晶化

周囲環境におけるメソ多孔性MCM-41を有するまたは含まない超微粒水酸化アルミニウム粒子の容易な調製

要約

さらに動画を探す

この動画の章

マイクロ波支援酸 - 触媒反応によりシリカナノ粒子の調製

プラズマを介した疎水性有機金属フレームワークの製造は、アンモニアの除去のためにペルフルオロアルカンの化学的気相成長法を強化

任意の基板上の垂直配向小分子有機ナノワイヤーの超高密度アレイ

モノとバイメタル早期遷移金属炭化物と窒化物ナノ粒子の逆マイクロエマルジョン媒介合成

摩耗の下で環境風化の下で製品の粒子エアロゾル化を調査するための実験プロトコール

メレンゲのような形態と Nanothermite: 超多孔質オブジェクトにルース パウダーから

同時マルチ表面 Anodizations、階段のような逆バイアスで硫酸陽極酸化アルミニウムとシュウ酸電解質の剥離

急速な超臨界抽出法によって作製した触媒のエアロゲルの作製と試験

ミル-96、UiO-66-NH2原子層のソルボサーマル合成繊維のマット上金属酸化皮膜に堆積

極薄高性能金属有機性フレームワーク膜の電気泳動の結晶化

メレンゲのような形態と Nanothermite: 超多孔質オブジェクトにルースパウダーから

ミル-96、UiO-66-NH₂原子層のソルボサーマル合成繊維のマット上金属酸化皮膜に堆積