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Hydration of Cement01:24

Hydration of Cement

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
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Precise control of the interlayer spacing between graphene sheets by hydrated cations.

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Highly efficient ion rejection is achieved using hydrated cations to control graphene oxide membrane spacing. This method precisely tunes interlayer distances for effective ion sieving, enhancing membrane performance.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Graphene oxide (GO) membranes show potential for efficient ion rejection.
  • Controlling interlayer spacing is crucial for selective ion transport.

Purpose of the Study:

  • To investigate the use of hydrated cations for precise control of interlayer spacing in graphene oxide membranes.
  • To elucidate the mechanism behind cation-controlled ion sieving.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • Analysis of charge transfer and orbital interactions was performed.

Main Results:

  • Hydrated cations (Li+, Na+, K+) precisely controlled graphene sheet interlayer spacing (9.35, 8.96, 8.82 Å).
  • Graphene membranes controlled by hydrated K+ excluded larger hydrated cations (Na+, Li+).
  • Strong hydrated cation-π interactions were identified as the control mechanism.

Conclusions:

  • Hydrated cations offer a precise method for tuning graphene membrane interlayer spacing for ion sieving.
  • Cation-π interactions are key to this control mechanism.
  • Graphene membranes form intercalation compounds with Na+ and Li+, but not K+.