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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

363
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
363
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
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尽量减少在CO2和水中的溶解效应 - - 使用上升悬挂下降方法测量界面张力.

Wei Yu1, Masud Babayev2, Abdullah S Sultan1,2,3

  • 1Center for Integrative Petroleum Research (CIPR), College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.

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概括
此摘要是机器生成的。

我们开发了一种新的悬挂滴技术,用于准确测量二氧化碳 (CO2) 和水之间的界面张力 (IFT). 这种方法提高了碳捕集和气酸盐研究的准确性.

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科学领域:

  • 地质化学 地质化学
  • 物理化学 物理化学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 精确的界面张力 (IFT) 测量对于碳捕集和气酸盐研究至关重要.
  • 使用水在气体配置的常规悬挂滴滴方法由于CO2溶解而遭受密度不准确.
  • 这导致IFT计算值存在重大错误,阻碍了可靠的地下二氧化碳储存评估.

研究的目的:

  • 开发和验证一种新的气体在水中悬挂滴滴技术,用于精确地测量二氧化碳和水之间的IFT测量.
  • 为了克服二氧化碳溶解和密度变化引起的传统方法的局限性.
  • 建立一个可靠的方法来确定CO2/CH4-水IFT在相关的水库条件下.

主要方法:

  • 开发了一种气体在水中的悬挂滴滴技术,使用连续注入来创建稳定的二氧化碳泡.
  • 在水相中最小化CO2溶解,允许使用纯相密度计算IFT.
  • 用CH4水系统验证了该方法,并系统测量了从0-80°C到50MPa的CO2/CH4水IFT.

主要成果:

  • 气体在水中的悬挂滴技术通过避免密度错误,提供精确的IFT测量.
  • 对于CO2/CH4-水系统,IFT值在广泛的温度和压力范围内进行了系统测量.
  • 结果表明,IFT在较低的温度下稳定,压力增加.

结论:

  • 开发的气体在水中悬浮滴滴技术为CO2水系统中准确的IFT测定提供了显著的改进.
  • 基于密度差异和温度的经验相关性有效地模拟了观察到的IFT行为.
  • 这项研究为推进二氧化碳储存和气酸盐形成和解离的研究提供了关键的基础.