论文标题
水溶液中胶体颗粒的电荷调节
Charge regulation of colloidal particles in aqueous solutions
论文作者
论文摘要
我们研究水溶液溶液中胶体颗粒的电荷调节。为了稳定胶体悬浮液防止降水，胶体颗粒的表面与酸性或碱性基团合成。与水接触，这些表面组经历质子转移反应，导致胶体表面电荷。电荷取决于溶液内部和胶体表面之间的氢化氢离子之间的局部化学平衡状况。我们使用百特粘性球模型来明确计算平衡分离常数，并构建能够定量预测胶体颗粒与酸性或基本表面基团的有效电荷的理论。该理论对模型的预测与蒙特卡洛模拟的结果非常吻合。该理论进一步扩展到与酸性和碱性表面基团的混合物处理胶体颗粒。
We study charge regulation of colloidal particles inside aqueous electrolyte solutions. To stabilize colloidal suspension against precipitation, colloidal particles are synthesized with either acidic or basic groups on their surface. In contact with water these surface groups undergo proton transfer reaction, resulting in colloidal surface charge. The charge is determined by the condition of local chemical equilibrium between hydronium ions inside the solution and at the colloidal surface. We use a model of Baxter sticky spheres to explicitly calculate the equilibrium dissociation constants and to construct a theory which is able to quantitatively predict the effective charge of colloidal particles with either acidic or basic surface groups. The predictions of the theory for the model are found to be in excellent agreement with the results of Monte Carlo simulations. The theory is further extended to treat colloidal particles with a mixture of both acidic and basic surface groups.
