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関連する概念動画

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

4.0K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
4.0K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.9K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.9K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.1K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

1.7K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
1.7K
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

535
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
535
Superplasticizers01:30

Superplasticizers

468
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
468

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関連する実験動画

Updated: May 2, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
07:51

Fabrication of Silica Ultra High Quality Factor Microresonators

Published on: July 2, 2012

17.0K

アクセシブル,オールポリマーメタ表面:低労量,高品質の要素

Michael Hirler1, Alexander A Antonov1, Enrico Baù1

  • 1Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-University, 80539 Munich, Germany.

ACS nano
|February 18, 2026
PubMed
まとめ

研究者は,一般的なポリマーを使用して高性能光学メタ表面を作成するためのより単純な方法を開発しました. このブレークスルーにより,高度な光学デバイスは,さまざまなアプリケーションでよりアクセスしやすく,持続可能になります.

キーワード:
連続体における束縛された状態.低インデックスフォトニクスメタス表面はメタス表面である.ナノ製造によるナノ製造です.ポリマー・ポリマーとは

さらに関連する動画

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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関連する実験動画

Last Updated: May 2, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
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Fabrication of Silica Ultra High Quality Factor Microresonators

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Published on: September 25, 2020

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科学分野:

  • ナノフォトニクスとメタ素材
  • ポリマーサイエンスの科学
  • 光学工学は,光学工学である.

背景:

  • 高品質のメタ表面は,高度な光学にとって不可欠ですが,複雑な製造が必要です.
  • 現在の方法には,堆積とエッチングなどの費用がかかり,時間がかかり,多段階のプロセスが含まれています.
  • これらの制限は,アクセシビリティ,スケーラビリティ,および持続可能性を妨げます.

研究 の 目的:

  • 高品質の光学メタ表面のための簡素化され,費用対効果の高い製造方法を開発する.
  • 複合的なエッチングステップを回避して,共振器材料としてポリメチルメタクリlate (PMMA) を再利用する.
  • 強化された光学性能のための2層の独立した膜アプローチを実証するために.

主な方法:

  • 共振器材料としてPMMAを使用した2層のスピンコーティング技術を使用しました.
  • 標準的なフォトリトグラフィー (曝露と展開) を採用し,金属/ダイエレクトリック沈殿やエッチングを施さない.
  • スキャニング電子顕微鏡と原子力顕微鏡のナノインデンテーションを用いて,結果として生じた自立ポリマー膜を特徴付けました.

主要な成果:

  • 可視波長と近赤外線波長で,高品質要素 (最大523) を有する全ポリマーメタ表面を成功裏に製造しました.
  • エッチングによる欠陥を回避することで,高品質のナノパターンを達成しました.
  • 振動線の幅と位置の幾何学ベースのチューニングを実証し,機械的性質 (スプリング定数,プレテンション) を特徴付けました.

結論:

  • この新しい製造方法により,高性能メタ表面のアクセシビリティと持続可能性が著しく向上します.
  • オールポリマーアプローチは,材料混合や機械的共振チューニングなどのユニークなアプリケーションを可能にします.
  • この技術は,費用対効果の高い高性能光学デバイスの道を開く.