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首页> 外文期刊>RSC Advances >Surfactant-free synthesis of hollow mesoporous organosilica nanoparticles with controllable particle sizes and diversified organic moieties
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Surfactant-free synthesis of hollow mesoporous organosilica nanoparticles with controllable particle sizes and diversified organic moieties

机译：无控制粒径和多样化有机部分的中空介孔有机粒子纳米粒子的表面活性剂合成

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Fine control over particle sizes and organic moieties of hollow organosilica nanoparticles is of importance towards practical applications of functional colloids in, for example, catalysis, drug delivery, and coating. Here, we report the versatile synthesis of hollow mesoporous organosilica nanoparticles with controllable particle sizes and diversified organic moieties using silica nanoparticles (SNs) as sacrificial, hard templates, which are removed by dissolution under alkali conditions. The resulting organosilica nanoparticles possessed size-tunable hollow interiors that can be accessed through mesoporous shells. The diameters of such hollow organosilica nanoparticles were easily controlled by altering the diameters of the SN templates, ranging from 12 to 170 nm. Organic moieties in the mesoporous shells can be diversified by changing the organosilica sources, (EtO) _(3) Si–R–Si(OEt) _(3) , where R = methylene, ethylene, and phenylene groups. In addition, it was revealed that there are minimum surface areas of the SN templates in the dispersions required to achieve the monodisperse silica/organosilica core/shell nanoparticles without homogeneous nucleation of organosilica nanoparticles. The nitrogen and argon adsorption–desorption isotherms of the resulting hollow organosilica nanoparticles showed type H5 hysteresis loops, which are derived from the mixed pore system of cage-like pores (hollow spaces) and open pores (interparticular voids between hollow organosilica nanoparticles). Hysteresis scanning measurements and NLDFT pore size distributions revealed the pore structures of the resulting hollow organosilica nanoparticles.
机译：对中空有机粒子纳米粒子的微粒和有机部分对功能性胶体的实际应用，例如催化，药物递送和涂层的实际应用是重要的。在这里，我们报告了使用硅纳米粒子（SNS）的可控粒度和多样化的有机部分作为牺牲的，硬模板的多功能合成，其通过碱条件下通过溶解除去。所得的有机硅纳米颗粒具有可通过介孔壳体进入的尺寸可调中空内饰。通过改变Sn模板的直径，从12至170nm的直径容易地控制这种中空有机纳米颗粒的直径。中孔壳中的有机部分可以通过改变有机硅来源（EtO）_（3）Si-R-Si（OET）_（3）而多样化，其中R =亚甲基，乙烯和亚苯基。另外，揭示了在没有均匀成核的单分散二氧化硅/有机硅酸核/壳纳米颗粒所需的分散体中存在的SN模板的最小表面区域。所得的中空有机碱纳米颗粒的氮和氩气吸附 - 解吸等温度显示H5型滞后环，其衍生自笼状孔（中空空间）的混合孔体系和开口孔（中空有机型纳米颗粒之间的正修孔）。滞后扫描测量和NLDFT孔径分布显示所得中空有机纳米颗粒的孔结构。

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