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関連する概念動画

Long-patch Base Excision Repair01:02

Long-patch Base Excision Repair

Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
Ferrocement01:30

Ferrocement

Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
Mass Concreting01:22

Mass Concreting

Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...

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Updated: Jul 12, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
07:32

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Published on: April 10, 2017

熱的に修復可能なクロスリンクされたポリメリック材料.

Xiangxu Chen1, Matheus A Dam, Kanji Ono

  • 1Exotic Materials Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)
|March 2, 2002
PubMed
まとめ

この研究では,軽度な条件下で何度も自己治癒できる新しい透明なポリマーを導入しています. この材料は,エポキシ樹脂に匹敵する堅固な機械的性質を備えており,材料の修復のための持続可能なソリューションを提供します.

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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Last Updated: Jul 12, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
07:32

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Published on: April 10, 2017

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11:09

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科学分野:

  • ポリマーサイエンスの科学
  • 材料科学 材料科学とは
  • 有機化学 オーガニック・ケミストリー

背景:

  • 伝統的なポリマーはしばしば自己修復能力が欠如し,材料の浪費と交換につながります.
  • 自己修復材料の開発は,製品の寿命と持続可能性を高めるために非常に重要です.

研究 の 目的:

  • 透明で自己治癒する有機ポリマー材料を開発する.
  • 材料の自己治癒特性のメカニズムと可逆性を調査する.
  • セルフヒーリングポリマーの機械性能を評価するために.

主な方法:

  • 透明な有機ポリマーの合成.
  • 室温および高温での機械試験.
  • 固体核磁共振スペクトロスコーピー (NMR) で,モノマー間の結合を分析する.
  • 軽度の条件下で骨折と自己治癒の実験を行いました.

主要な成果:

  • 開発されたポリマーは透明であり,商業用エポキシ樹脂に匹敵する機械的性質を持っています.
  • 120°C以上では,約30%のインターモノマー結合が,冷却時に可逆的に断つと再接続します.
  • 材料は,触媒,追加のモノマー,または特殊な表面処理なしで繰り返し治癒することができます.
  • セルフヒーリングは,ポリマーの破裂した部分を複数回修復します.

結論:

  • 新しい,透明で自己治癒するポリマーが成功裏に開発されました.
  • 材料の自己治癒メカニズムは,可逆性結合解離と再構成に依存しています.
  • この自己治癒ポリマーは,様々な用途で従来の材料に持続可能で効率的な代替品を提供します.