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Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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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 soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
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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.
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Drying Shrinkage01:21

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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
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The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
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Fabrication and Characterization of Optical Tissue Phantoms Containing Macrostructure
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Simulating ceramic-filled vat photopolymerization resins using Monte Carlo ray tracing.

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    This study introduces a Monte Carlo ray-tracing simulation to predict light scattering in ceramic resins for vat photopolymerization (VP). The simulation accurately predicts photocured shapes, improving resolution in 3D ceramic printing.

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    Area of Science:

    • Materials Science
    • Additive Manufacturing
    • Photochemistry

    Background:

    • Vat photopolymerization (VP) of ceramic suspensions faces resolution limitations due to light scattering by ceramic particles.
    • Scattered light alters UV intensity distribution, affecting cure depth and width, crucial for part accuracy.

    Purpose of the Study:

    • To develop a predictive Monte Carlo ray-tracing (MCRT) simulation for light scattering and UV energy absorption in particle-filled resins.
    • To accurately model the impact of particle size distribution and refractive index on light propagation within ceramic suspensions for VP.

    Main Methods:

    • Developed an MCRT simulation incorporating volume-dependent light scattering physics for polydisperse particle sizes.
    • Utilized experimentally acquired parameters: refractive index, particle size distribution, light source intensity, and critical exposure.
    • Simulated and experimentally validated cure profiles for zinc oxide (ZnO)-filled polyester acrylate resin (refractive index 2.2) at varying ZnO loadings (1-5 vol%).

    Main Results:

    • The MCRT simulation accurately predicted experimental cure profile shapes.
    • Simulated cure depths were within 10% (20 µm) of experimental values.
    • Simulated cure widths were within 30% (15 µm) of experimental values.

    Conclusions:

    • The developed MCRT simulation provides a highly accurate method for predicting photocured profiles in ceramic-loaded resins.
    • This predictive capability can enhance resolution and control in vat photopolymerization of composite and ceramic parts.
    • The simulation's reliance on experimentally acquired parameters makes it broadly applicable for optimizing VP processes.