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相关概念视频

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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相关实验视频

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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通过分层的n型聚合物化学电阻进行超敏感的探测.

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
概括

高灵敏度的气传感器对于安全至关重要. 这项研究引入了一种使用合聚合物的新型复合化学电阻,在室温下实现10亿分之一的检测,用于清洁燃料应用.

科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 传感器技术 传感器技术

背景情况:

  • 是一种清洁的燃料,但它的易燃性需要敏感的泄漏检测.
  • 现有的化学电阻在室温下缺乏必要的10亿分之一 (ppb) 灵敏度.

研究的目的:

  • 开发超灵敏的室温气传感器.
  • 为了克服传统化学电阻对泄漏检测的局限性.

主要方法:

  • 复合器件的制造具有分层架构.
  • 使用n型合聚合物作为PdPt和金属氧化物层之间的半导体.
  • 使用空间分离的金属层解兴奋剂和脱兴奋剂过程.

主要成果:

  • 在干燥的空气中,对0.5%的H2达到>4000%的反应.
  • 显示了174ppb的检测极限.
  • 在环境条件下表现出良好的湿度耐受性和ppm以下的灵敏度.

结论:

  • 这种新的复合结构使得超灵敏的探测成为可能.
  • 开发的传感器为安全提供了一个简单,廉价和商业可行的解决方案.
关键词:
化学电阻器 化学电阻器结合聚合物的聚合物.探测气的感应器金属纳米颗粒金属纳米颗粒多孔的聚合物是多孔的.

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Fully Automated Centrifugal Microfluidic Device for Ultrasensitive Protein Detection from Whole Blood
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Fully Automated Centrifugal Microfluidic Device for Ultrasensitive Protein Detection from Whole Blood

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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes

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  • 这种方法显著提升了室温探测能力.