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Superplasticizers01:30

Superplasticizers

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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,...
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Plasticizers01:31

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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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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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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.
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リボフラビンは,ピエゾ電気PLA/BT複合材料の生物分解を促進する二重機能添加物として

Natalia Puszczykowska1, Piotr Rytlewski1, Agnieszka Mirkowska2

  • 1Faculty of Materials Engineering, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland.

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まとめ
この要約は機械生成です。

リボフラビン (RF) は,ポリ乳酸/バリウムチタナート (PLA/BT) のピエゾ電気複合材料の生物分解を促進する. この改変は,電気機械的性質を犠牲にすることなく,生物学的インプラントの微生物の成長と制御された再吸収を促進します.

キーワード:
バチオ3PLA について生物分解ピエゾ電気バイオマテリアルピエゾエレクトリック複合材料リボフラビン

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科学分野:

  • バイオマテリアル科学
  • 材料工学
  • 生物医学工学

背景:

  • ポリ乳酸/バリウムチタネート (PLA/BT) 複合物は,骨組織工学に適したピエゾ電気特性を提供します.
  • PLA/BTの生物分解性が限られているため,生物学的インプラントの再吸収が妨げられます.

研究 の 目的:

  • PLA/BT複合材料の生物分解を促進する二重機能添加物としてのリボフラビン (RF) を調査する.
  • バイオメディカル用途のPLA/BT複合材料の電気機械的特性と再吸収に対するRFの影響を評価する.

主な方法:

  • PLA/BT複合物はリボフラビン (RF) で改造された.
  • 特徴付けには,熱重力測定 (TG),微分スキャニングカロメトリー (DSC),牽引試験,動力機械分析 (DMA),介電性,およびピエゾ電気係数 (d33) の測定が含まれていた.
  • 生物分解は,質量損失とスキャニング電子顕微鏡 (SEM) で微生物の植民と表面の変化を評価した.

主要な成果:

  • 無修正のPLA/BTと比較して,RF添加は微生物のコロニー化と質量損失を著しく増加させた (28日間で16%まで).
  • PLA/BT/RF複合材料は機能的なピエゾ電気性を維持した (d33 ≈ 3.9 pC/N).
  • SEMは,RFで改変したサンプルの生物分解後の微生物の活性化と表面の劣化を確認した.

結論:

  • リボフラビンは,PLA/BTのピエゾ電気複合材料の生物分解を効果的に促進する.
  • 制御された再吸収は,本質的な電機性能を損なうことなく達成できます.
  • これらの発見は,再吸収可能な生体医学的インプラントのためのRF改変PLAベースのピエゾ電気複合材料の使用を支持する.