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Phuc Nguyen Thien,Giang Nguyen Thi Huong,An Vu Nguyen Thien Truong,Nam Nguyen Thanh Hoai,Anh Ly Duc,Nguyen Huynh Cam,An Hoang,Phong Mai Thanh,Hieu Nguyen Huu 한국탄소학회 2023 Carbon Letters Vol.33 No.2
In this study, graphene oxide (GO) was synthesized by the improved Hummers’ method. The degree of oxidation from graphite (Gi) to GO was determined through interlayer spacing calculated from X–ray diffraction. Besides, the effect of KMnO4:Gi ratios (X1), H2SO4 volume (X2), oxidation temperature (X3), oxidation time of stage 1 (X4), and oxidation time of stage 2 (X5) was screened by the Plackett–Burman model. The simultaneous impact of three factors that influenced the degree of oxidation (X1, X2, and X3) was studied by the Box–Behnken experimental model of response surface methodology to achieve suitable conditions for the GO synthesis process. The characterization of GO product was investigated via the modern analytical methods: X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, UV–Vis spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. In addition, the study was also carried out on a pilot scale for orientation in industrial application with the yield of 14 g/batch.
Port logistics service quality and customer satisfaction: Empirical evidence from Vietnam
Le Duc Nha,Nguyen Hong Thi,Hoang Truong Phuc 한국해운물류학회 2020 The Asian journal of shipping and Logistics Vol.36 No.2
This paper aims to validate five determinants of service quality and to examine the service qualitycustomer satisfaction link in the port logistics service industry of a developing and transitional economy. First,the research reviews literature pertinentto service quality and customer satisfaction. Second, it uses both qualitative and quantitative methods through focus group discussion and directinterviews with 212 respondents who are the employees of firms that have been using port logistics service provided by Cat Lai Port, Ho Chi Minh City, Vietnam. Finally, the multivariate analysis is subsequently employed to analyze data obtained from surveys by structural equation modeling (SEM) technique. Findings indicate that port logistics service quality is positively determined by five factors including responsiveness, assurance, reliability, tangibles and empathy. In addition, port logistics service quality exerts positive influence on customer satisfaction. Most noticeably, as embedded in the tangibles component, technological advancements appear to enhance service quality which ultimately satisfies customers in the port logistics service industry.