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関連する概念動画

Mortar01:29

Mortar

Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
Accelerators01:17

Accelerators

Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
Retarders01:19

Retarders

Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
Superplasticizers01:30

Superplasticizers

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,...
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...

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構造を指示する液体添加物を用いたゼオリティクイミダゾラートフレームワークの機械化学的固体スクリーニング

Ivana Brekalo1,2,3, Katarina Lisac1, Joseph R Ramirez2

  • 1Division of Physical Chemistry, Ruđer Bošković Institute, Zagreb 10000, Croatia.

Journal of the American Chemical Society
|July 24, 2025
PubMed
まとめ

機械化学的液体補助研磨 (LAG) で,亜鉛イミダゾラート (ZnIm2) 形態の検査が成功しました. この方法により8つの新しいトポロジック形式が発見され,金属有機構造の発見が加速された.

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Last Updated: May 11, 2026

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科学分野:

  • 材料科学
  • 化学について
  • クリスタルグラフィー

背景:

  • 亜鉛イミダゾラート (ZnIm2) は,最も単純なゼオリスイイミダゾラートフレームワーク (ZIF) 材料である.
  • ZnIm2の新しい形態の発見は,金属有機フレームワーク (MOF) の理解に不可欠です.
  • 既存の合成方法は,様々なMOF構造を探求する上で限界があります.

研究 の 目的:

  • 液体補助研磨 (LAG) をZnIm2型をスクリーニングするために体系的に適用する.
  • 異なる液体添加物のZnIm2合成への影響を調査する.
  • 新しいトポロジカルと結晶学的に異なる ZnIm2 の形を発見する.

主な方法:

  • 機械化学的液体補助研磨 (LAG) を用いた45の液体添加物の体系的なスクリーニング.
  • 分散修正周期密度関数理論 (DFT) の計算を用いた計算探索.
  • 結晶学的分析を含む合成された ZnIm2 形態の特徴化.

主要な成果:

  • crb (BCT) トポロジーの2つの新しい形式を含む8つの異なるZnIm2トポロジーを特定した.
  • 結晶学的に異なる13の固体形態,無形相,そして中断されたmoc-Zn4Im8HImを合成した.
  • LAGは合成を加速し,トポロジ的に異なるMOFの形成を指揮しました.

結論:

  • LAGは新しい金属有機物質を発見するための強力な機械化学ツールです.
  • 液体添加物は,MOF合成に大きく影響し,直接的に作用する.
  • この研究は,添加物指向のMOF合成を予測するLAGの可能性を実証しています.