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Synthesis of CeO2 Nanoparticles Derived by Urea Condensation for Chemical Mechanical Polishing
Zhenyang Wang,Tongqing Wang,Lifei Zhang,Xinchun Lu 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.6
The synthesis of CeO2 nanoparticles for CeO2 based slurry gains continuous emphasis on improving its performance in the chemical mechanical polishing of dielectric materials. Urea was selected to dominate the growth and morphology during the calcination process. Thermogravimetry experiments were used to analyze the the decomposition behavior. Particle morphology and size were analyzed. Crystalline phase information and surface valence were used to compare the differences in surface physical and chemical properties of ceria by different synthesis process. The CeO2 nanoparticles synthesized with urea were dispersed in water as slurry. The particle sizes of CeO2 were measured by dynamic light scattering. The Zeta potential of CeO2 dispersion were measured to show dispersing performance. The CeO2 nanoparticles synthesized with urea condensation show good monodisperse properties. The material removal rate of silicon oxide and surface quality after chemical mechanical polishing were selected to evaluate the chemical mechanical polishing performance. The CeO2 nanoparticles synthesized with urea condensation not only yielded better surface quality results than the commercial slurry but also showed a 153% (pH = 4) and 100% (pH = 10) increase in the material removal rate of silicon oxide compared to commercial.
Li Liao,Miao Changfeng,Peng Shayong,Jiang Yu,Lu Xinchun 대한독성 유전단백체 학회 2022 Molecular & cellular toxicology Vol.18 No.2
Background Circular RNAs (CircRNAs) play vital roles in the pathogenesis of hepatocellular carcinoma (HCC). However, the exact role and detailed mechanism of hsa_circ_0001964 during HCC carcinogenesis remains unknown. Objective To explore the expression, role and mechanism of hsa_circ_0001964 in HCC. Result The results indicated that the mRNA expression of hsa_circ_0001964 was upregulated in HCC cell lines and tissues, respectively, and hsa_circ_0001964 knockdown inhibited HCC cell proliferation in vitro. Western blot analysis showed that hsa_circ_0001964 knockdown suppressed the activation of the PI3K/AKT signaling pathway and its downstream factors (including c-Jun, c-Myc, and CCND1). Conclusion The results of the present study suggested that hsa_circ_0001964 may correlate with HBV infection, and it promotes HCC carcinogenesis via the PI3K/AKT signaling pathway. The findings of the present study provide important insights into the molecular mechanisms of HCC initiation, which may help to develop new treatment strategies against HCC.