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関連する概念動画

Polymers02:34

Polymers

41.0K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
41.0K
Polymers02:34

Polymers

23.3K
23.3K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.6K
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 polymer...
2.6K
Hydrogen Bonds00:26

Hydrogen Bonds

133.9K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
133.9K
Hydrogen Bonds01:04

Hydrogen Bonds

14.7K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
14.7K
Types of Errors: Detection and Minimization01:12

Types of Errors: Detection and Minimization

11.4K
Error is the deviation of the obtained result from the true, expected value or the estimated central value. Errors are expressed in absolute or relative terms.
Absolute error in a measurement is the numerical difference from the true or central value. Relative error is the ratio between absolute error and the true or central value, expressed as a percentage.
Errors can be classified by source, magnitude, and sign. There are three types of errors: systematic, random, and gross.
Systematic or...
11.4K

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関連する実験動画

Updated: Feb 6, 2026

In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure
10:01

In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure

Published on: March 31, 2018

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層状n型ポリマーケミレジスタによる超高感度水素検出

Harrison M Bergman1, Kimberly Hoang1, Thomas N Pioch1

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

Nano letters
|February 4, 2026
PubMed
まとめ

高感度水素センサーは安全のために重要である。この研究は、共役ポリマーを使用した新しい複合ケミレジスタを紹介し、クリーン燃料用途のために室温で十億分率（ppb）レベルの検出を達成する。

科学分野:

  • 材料科学
  • 化学工学
  • センサー技術

背景:

  • 水素はクリーン燃料であるが、その引火性には高感度な漏れ検出が必要である。
  • 既存のケミレジスタは、室温で必要な十億分率（ppb）感度を欠いている。

研究 の 目的:

  • 超高感度室温水素センサーを開発すること。
  • 水素漏れ検出のための従来のケミレジスタの限界を克服すること。

主な方法:

  • 層状構造を持つ複合デバイスの作製。
  • PdPt層と金属酸化物層の間の半導体としてn型共役ポリマーを利用すること。
  • 空間的に分離された金属層を使用してドーピングおよび脱ドーピングプロセスを分離すること。

主要な成果:

  • 乾燥空気中0.5% H2に対して4000%以上の応答を達成した。
  • 174 ppbの検出限界を実証した。
  • 室温条件下でppm以下の感度で良好な湿度耐性を示した。

結論:

  • 新しい複合構造は、超高感度水素検出を可能にする。
キーワード:
ケミレジスタ共役ポリマー水素センシング金属ナノ粒子多孔質ポリマー

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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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  • 開発されたセンサーは、水素安全のためのシンプルで安価で商業的に実行可能なソリューションを提供する。
  • このアプローチは、室温水素センシング能力を大幅に進歩させる。