Molybdenum disulfide nanosheets embedded with nanodiamond particles: co-dispersion nanostructures as reinforcements for polymer scaffolds
Molybdenum disulfide nanosheets embedded with nanodiamond particles: co-dispersion nanostructures as reinforcements for polymer scaffolds
复制标题
嵌入纳米金刚石颗粒的二硫化钼纳米片：共分散纳米结构作为聚合物支架的增强材料
DOI：
10.1016/j.apmt.2019.08.005
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发表时间：
2019-12-01
影响因子：
8.3
通讯作者：
Shuai, Cijun
中科院分区：
文献类型：
--
作者：
Feng, Pei;Kong, Ye;Shuai, Cijun
低维纳米材料的聚集限制了它们作为聚合物增强体的应用。在这项研究中，共分散纳米结构的构建通过嵌入纳米金刚石（ND）颗粒到二硫化钼（MoS 2）纳米片，然后被纳入到聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）骨支架，通过选择性激光烧结制造。在纳米结构中，八面体ND颗粒被夹在相邻的MoS 2纳米片之间，这抑制了MoS 2纳米片的重新堆叠。此外，二硫化钼纳米片作为空间位阻层，这阻止了八面体ND颗粒的聚集。实验结果表明，当MoS 2和ND的质量分数分别为1%和2%时，MoS 2纳米片和ND粒子在PHBV基体中分散均匀，而单独负载时，则发生团聚。结果，与纯PHBV支架相比，具有MoS 2和ND负载的支架表现出94%的拉伸强度增加和52%的压缩强度增加。主要的强化机制是裂纹偏转、裂纹桥接、裂纹钉扎以及MoS 2纳米片和ND颗粒的拔出。此外，支架表现出良好的细胞相容性，细胞粘附，生长和蔓延，以及积极的活力，细胞增殖。(C)2019爱思唯尔有限公司版权所有。
The aggregation of low-dimensional nanomaterials restricts their use as reinforcements in polymers. In this study, co-dispersion nanostructures were constructed by embedding nanodiamond (ND) particles into molybdenum disulfide (MoS2) nanosheets, and then were incorporated into poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) bone scaffolds that were fabricated via selective laser sintering. In the nanostructures, octahedral ND particles were sandwiched between adjacent MoS2 nanosheets, which restrained the restacking of the MoS2 nanosheets. Additionally, the MoS2 nanosheets acted as steric hindrance layers, which prevented the aggregation of octahedral ND particles. Experimental results demonstrated that the MoS2 nanosheets and ND particles were evenly dispersed in the PHBV matrix when 1 wt% of MoS2 and 2 wt% of ND were loaded at the same time, while the aggregation occurred when they were loaded individually. As a result, the scaffold with MoS2 and ND loading exhibited a 94% increase in tensile strength and 52% increase in compressive strength compared to a pure PHBV scaffold. The main strengthening mechanisms were crack deflection, crack bridging, crack pinning, and pulling out of MoS2 nanosheets and ND particles. In addition, the scaffold exhibited good cytocompatibility for cell adhesion, growth and spreading, as well as positive viability for cell proliferation. (C) 2019 Elsevier Ltd. All rights reserved.