Mingguo MA
,
Yingjie ZHU
,
Guofeng CHENG
,
Yuehong HUANG
材料科学技术（英文）
Boehmite nanorods were synthesized by a solvothermal method using AlCl3•6H2O in mixed solvents of water and aniline. The solvothermal time, heating temperature and the concentration of aniline have effects on the morphology of boehmite. γ-alumina nanorods were prepared by a simple thermal transformation of boehmite nanorods. A rational mechanism based on the oriented attachment is proposed for the formation of boehmite nanorods. The products were characterized by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Photoluminescence (PL) spectrum of the boehmite nanorods was also investigated.
关键词:
Boehmite
,
γ-Alumina
,
Nanorods
,
Solvotherma
Xu Shao
,
Zhou Zhiyu
,
Gao Manman
,
Zou Changye
,
Che Yinglin
,
Cody Bünger
,
Zou Xuenong
,
Zhou Lei
材料科学技术（英文）
doi:10.1016/j.jmst.2016.08.009
Titanium (Ti) nanorods fabricated using selective corrosion of Ti substrate by anodic technology show better biocompatibility with pre-osteoblast cells. The current study investigated the response of the murine pre-osteoblast cell MC3T3-E1 on Ti nanorod topography and untreated Ti surfaces by means of examination of the morphology and osteogenic differentiation responsible for the pre-osteoblast reaction. The morphology of MC3T3-E1 cells was observed using scanning electron microscopy, and alkaline phosphatase (ALP) activity was measured using a colorimetric assay after incubation for 7, 14, and 21 days. The expression of three osteogenic differentiation markers including ALP, osteocalcin (OCN), and collagen type 1A1 (COL1A1) and two transcription factors including runt related transcription factor 2 (Runx2) and osterix (Osx) at different time points was detected using real-time polymerase chain reaction analysis in both groups. Osx was used to confirm the protein level. The results showed that Ti nanorod surfaces provided prolonged higher levels of ALP activity compared with unmodified Ti surface on the 14th and 21st days. Gene expression analysis of ALP, OCN, and COL1A1 showed significant upregulation with modified nanorod topography after incubation for 14 and 21 days. Osteogenic transcription factors of Runx2 and Osx exhibited changes consistent with the osteogenic differentiation markers, and this may contribute to the persistently active differentiation of MC3T3-E1 cells in the Ti nanorod group. These results demonstrated that the current nanostructured surface may be considered bioadaptive topography to control cellular behaviors and osteoblast differentiation. The in vivo performance and applicability are further required to investigate osseointegration between implant and host bone in the early stages for prevention of aseptic implant loosening.
关键词:
Titanium
,
Nanorods
,
Osteointegration
,
Osteoblast differentiation
Chun-wen WANG
,
Jr-hau HE
材料科学技术（英文）
Vertically aligned ZnO nanorods were synthesized on a-plane sapphire via a metal catalyzed vapor phase transport and condensation process in a two-zone vacuum furnace. Planar-tip and tapered-tip ZnO nanorods were successfully synthesized by utilizing different source materials under the same growth conditions. The growth mechanisms were proposed to be vapor-liquid-solid (VLS) process for planar-tip ZnO nanorods and a combination of VLS and self-catalyzed processes for tapered-tip ZnO nanorods. From cathodoluminescence (CL) measurements, tapered-tip ZnO nanorods have more intense green emission than planar-tip ZnO nanorods, and therefore possess higher oxygen vacancy concentration than planar-tip ZnO nanorods. From CL characteristics, well-aligned planar-tip ZnO nanorods shall serve effectively as laser source, while well-aligned tapered-tip ZnO nanorods are suitable for direction-related optical applications.
关键词:
ZnO
,
well-aligned
,
nanorods
,
cathodolumines
任鹏飞
,
邹小平
,
程进
,
张红丹
,
李飞
,
朱光
,
王茂发
材料科学与工程学报
doi:10.3969/j.issn.1673-2812.2007.06.024
本文介绍一种用电化学还原法制备氧化铅纳米棒的简单方法.实验中所用的电解液是混有氧氯化锆和三氯化钛的硝酸铅溶液,采用不锈钢片作为阴极和基底.在室温下,由直流电源供电,通过控制输出电流的大小在不锈钢片基底上沉积产物.氧化铅纳米棒的产生与电流密度有关,通过讨论,得出生成氧化铅纳米棒的最佳电流密度大小.用SEM、TEM、EDS和XRD对产物进行了表征.研究结果表明,所制备的氧化铅纳米棒是单晶结构.
关键词:
氧化铅
,
纳米棒
,
电化学还原
,
电流密度
