Search

Your search keyword '"Endo, Morinobu"' showing total 204 results
Start Over Author "Endo, Morinobu" Publisher elsevier b.v.
204 results on '"Endo, Morinobu"'

42. Preparation of polysulfone support for higher-performance reverse osmosis membranes.

Author

Takeuchi, Kenji, Cruz-Silva, Rodolfo, Fujishige, Masatsugu, Yanagisawa, Naomi, Kitazawa, Hidenori, Maeda, Jun, and Endo, Morinobu

Subjects
REVERSE osmosis, ARAMID fibers, CARBON nanotubes, DIMETHYLFORMAMIDE, PERMEABILITY
Abstract

We prepared a polysulfone (PSU) support by applying a coating of a PSU-N,N-dimethylformamide (DMF) solution on 91 µm thick nonwoven and then set it in water (the phase inversion process). The prepared PSU-substrate sheet was 280 mm wide and 10 m long. We then investigated the effects of the preparation conditions (i.e., the concentration of the PSU-DMF solution and the coating thickness) on the water permeability of the resulting PSU support. The thickness of the PSU layer increased almost linearly with the increase in the coating thickness, and the water permeability decreased monotonically with the increase in the PSU layer's thickness. A bubble point analysis revealed that the pore size dia. of the membranes was approx. 20–60 nm, depending on the PSU-DMF solution's concentration. Using these PSU membranes as the support, we prepared a reverse-osmosis (RO) membrane, the active layer of which consisted of aromatic polyamide (PA) that contained carbon nanotubes. The salt rejection rate 99.7% and water permeability at 0.56 L m−2 h−1 bar−1 were achieved at 5.5 MPa for a 3.2% NaCl solution with the RO membrane, the support of which was prepared from a 17.0% PSU-DMF solution. [Display omitted] • Investigated the effect of the PSU concentration in a PSU-DMF solution. • The effect of the coating thickness on the water permeability. • The salt rejection rate 99.7% was achieved at 17.0% PSU-DMF solution. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

43. CO2 adsorption on crystalline graphitic nanostructures.

Author

Casco, Mirian Elizabeth, Morelos-G¢mez, Aar¢n, Vega-D¡az, Sofia Magdalena, Cruz-Silva, Rodolfo, Trist n-L¢pez, Ferdinando, Muramatsu, Hiroyuki, Hayashi, Takuya, Mart¡nez-Escandell, Manuel, Terrones, Mauricio, Endo, Morinobu, Rodr¡guez-Reinoso, Francisco, and Silvestre-Albero, Joaqu¡n

Subjects
ADSORPTION (Chemistry), GRAPHENE, NANORIBBONS, NANOSTRUCTURED materials, FUNCTIONAL groups, CARBON
Abstract

Abstract: CO2 adsorption has been measured in different types of graphitic nanostructures (MWCNTs, acid treated MWCNTs, graphene nanoribbons and pure graphene) in order to evaluate the effect of the different defective regions/conformations in the adsorption process, i.e., sp3 hybridized carbon, curved regions, edge defects, etc. This analysis has been performed both in pure carbon and nitrogen-doped nanostructures in order to monitor the effect of surface functional groups on surface created after using different treatments (i.e., acid treatment and thermal expansion of the MWCNTs), and study their adsorption properties. Interestingly, the presence of exposed defective regions in the acid treated nanostructures (e.g., uncapped nanotubes) gives rise to an improvement in the amount of CO2 adsorbed; the adsorption process being completely reversible. For N-doped nanostructures, the adsorption capacity is further enhanced when compared to the pure carbon nanotubes after the tubes were unzipped. The larger proportion of defect sites and curved regions together with the presence of stronger adsorbent–adsorbate interactions, through the nitrogen surface groups, explains their larger adsorption capacity. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results