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Preparation of Spherical Bi3.25La0.75Ti3O12 Nanocrystals by a Sol-Gel Inverse Mini-Emulsion Approach
Han Longxiang,Zheng Lingjing,Hu Zhenxing,Yin Shilong,Zeng Yanwei 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
Monodisperse and spherical lanthanum bismuth titanate (Bi3.25La0.75Ti3O12, BLT) nanocrystals with an average size of ~60 nm were synthesized by in situ crystallization of spherical gel particles (~120 nm in diameter) at elevated temperatures in a carbonate environment. The gel particles were obtained by a sol-gel inverse mini-emulsion manipulation and a gelation process at 60°C. X-ray diffraction technique and Raman spectrum measurement were used to trace the formation of crystalline phases in the gel particles during heat treatment, and single-phase BLT nanocrystals were obtained after firing at 500°C for 4 h. The morphology and size of the gel particles and BLT nanocrystals were characterized by field-emission scanning electron microscopy and transmission electron microscopy. The possible mechanism underlying the formation of spherical BLT nanocrystals through a sol-gel inverse mini-emulsion approach was discussed.
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Mechanical Properties and Microstructure of Polypropylene Fiber Reinforced Cement Mortar Soil
Bo Ruan,Hui Ding,Jidong Teng,Wei Deng,Shilong Zheng,Chenxi Ruan 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
A series of unconfined compressive strength tests and flexural strength tests are carried out to evaluate the improved effect of polypropylene fiber on the defects of cement mortar soil. The following factors, including the fiber content, cement content, sand content and curing age, are studied to investigate the influences on the mechanical properties and microstructure of the samples. The results show that the unconfined compressive strength (UCS), residual strength and flexural strength of the fiber reinforced cement mortar soil (FRCMS) substantially increase with increasing fiber content. The peak strain and ratio of the flexural-compression strength (Rfcs) of the FRCMS first increase and then decrease with an increase in fiber content,and the optimal fiber content is 3.5%. The brittleness index of the FRCMS is found to be inversely proportional to fiber content. The results suggest that the addition of an appropriate amount of fibers can substantially improve the plasticity and lateral stress capacity of the FRCMS. The strength of the FRCMS improves with the increase in cement content, sand content and curing age within a certain range. The microstructure of the FRCMS are analyzedby scanning electron microscopy (SEM) tests.
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