论文标题
铁矿纳米颗粒夹在剪切诱导的多层囊泡中
Ferrihydrite nanoparticles entrapped in shear-induced multilamellar vesicles
论文作者
论文摘要
假设铁硫酸盐（FH）纳米颗粒由于其较大的反应性表面积，晶体结构和纳米颗粒形态而受到了相当大的科学兴趣。它们在生物地球化学过程中非常重要，并且具有隔离危险和有毒物质的能力。在这里，工作假设是在剪切诱导的多层囊泡（MLV）状态下，使用40 wt的多层状囊泡（MLV）状态下，旋转的半径为6.2 nm，旋转的半径为6.2 nm，旋转的半径为6.2 nm，并且是半径为0.8 nm的主要构建块。实验小和宽角X射线散射显示了非离子平面层状相的平衡状态，FH色散及其混合物。通过在节理仪的泰勒 - 库特几何形状中使用剪切流诱导MLV状态。发现非离子表面活性剂最初表现出层状凝胶相，两个不同的D间距为11.0和9.7 nm，在剪切流下塌陷到MLV状态中。 FH纳米颗粒通过抑制层状层的起伏而诱导双层吸引力，从而减少D间距。这些结果有助于理解纳米颗粒大小与纳米颗粒 - 双层相互作用之间的关系，并在动力学稳定的MLVS状态下提供了有关FH封装的见解。
Hypothesis Ferrihydrite (Fh) nanoparticles are receiving considerable scientific interest due to their large reactive surface areas, crystalline structures, and nanoparticle morphology. They are of great importance in biogeochemical processes and have the ability to sequester hazardous and toxic substances. Here, the working hypothesis was to entrap fractal-like Fh nanoparticles, with a radius of gyration of 6.2 nm and a primary building block of polydisperse spheres with a radius of 0.8 nm, in a shear-induced multilamellar vesicle (MLV) state using a 40 wt.% polyethylene glycol dodecyl ether surfactant. Experiments Small- and Wide- Angle X-ray scattering revealed the equilibrium state of the non-ionic planar lamellar phase, the Fh dispersion, and their mixture. The MLV state was induced by using a shear flow in a Taylor-Couette geometry of a rheometer. Findings The nonionic surfactant initially exhibited a lamellar gel phase with two distinct d-spacings of 11.0 and 9.7 nm, which collapsed into the MLV state under shear flow. The Fh nanoparticles induced bilayer attraction by suppressing lamellar layer undulations, decreasing the d-spacing. These results are helpful in the understanding of the relationship between nanoparticle size and nanoparticle-bilayers interactions and provides insight on Fh encapsulations in a kinetically stable MLVs state.
