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RISS 인기검색어
- 검색키워드
- 저자 : Cersosimo, Maurizio (검색결과 3 건)
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In situ restoring of aged thermally rearranged gas separation membranes
Brunetti, Adele,Cersosimo, Maurizio,Dong, Guangxi,Woo, Kyung Take,Lee, Jongmyeong,Kim, Ju Sung,Lee, Young Moo,Drioli, Enrico,Barbieri, Giuseppe Elsevier 2016 Journal of membrane science Vol.520 No.-
<P><B>Abstract</B></P> <P>Physical aging in high free-volume polymer membranes is one of the main hurdles limiting their application in gas separation. The recovery of membrane separation properties without the need to disassemble the module, although challenging, would provide significant advantages for applications in various fields. In this work, an in situ restoring procedure for the recovery of mass transport in aged membrane modules made of thermally rearranged polymer membranes was developed in which the modules were exposed to methanol at 80°C. The thermally rearranged hollow fiber membrane modules were subjected to long-time operation to investigate their aging: the CO<SUB>2</SUB> and N<SUB>2</SUB> permeances were monitored at different temperatures, pressures, and feed compositions over a total period of 727 days with two long-time runs of 185 and 263 days, interspersed by a stand-by period of 240 days, and with each run followed by a restoring. In both long-time runs, CO<SUB>2</SUB> and N<SUB>2</SUB> permeance dropped as a result of aging, whereas the selectivity remained nearly constant. The permeances were fully recovered after the proposed restoring procedure was applied, demonstrating its efficacy and repeatability for membrane aging recovery, even for an extremely aged membrane exposed to various conditions for nearly two years.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In-situ restoring of mass transport in aged membranes. </LI> <LI> Thermally rearranged polymer membranes. </LI> <LI> Periodic measures over years on thermally rearranged polymer membranes. </LI> <LI> Repeatability of in-situ restoring showing full permeation properties recovery. </LI> </UL> </P>
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Thermally rearranged mixed matrix membranes for CO<sub>2</sub> separation: An aging study
Brunetti, Adele,Cersosimo, Maurizio,Kim, Ju Sung,Dong, Guangxi,Fontananova, Enrica,Lee, Young Moo,Drioli, Enrico,Barbieri, Giuseppe Elsevier 2017 INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL Vol.61 No.-
<P><B>Abstract</B></P> <P>In this work, the aging behavior of a thermally rearranged polybenzoxazole-co-imide (TR-PBOI) mixed matrix membrane loaded with 0.5wt.% of oxidized multi-wall carbon nanotubes (MWCNT) was evaluated and then compared to a pure TR polymeric membrane prepared from the same precursor. To the best of authors knowledge, this is the first report of a mixed matrix membrane being prepared through the dispersion of MWCNTs within a thermally rearranged polymer matrix for CO<SUB>2</SUB> separation. Microporous structures were created in both membranes when thermally rearranged at 375°C, facilitating fast mass transfer ideal for membrane gas separation. The TR mixed matrix membrane with oxidized CNTs demonstrated improved separation properties with regard to both permeability and selectivity compared to the pure TR polymeric membrane due to a greater degree of thermal rearrangement (11.3%) than what was exhibited by the TR membrane (6.7%). Moreover, the high CO<SUB>2</SUB> solubility typical of TR polymers coupled with diffusivity enhancements improved the CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity. The addition of oxidized CNTs to the TR-PBOI polymer did not significantly influence the aging behavior of the mixed matrix membrane. Both pure TR-PBOI and mixed matrix membranes exhibited an increase in CO<SUB>2</SUB> selectivity due to physical aging. The improved separation properties in conjunction with an unchanged membrane stability over time suggested that the addition of CNTs to pure TR membranes could be an excellent approach toward improving the performance of thermally rearranged membranes applied toward gas separation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Separation properties of a pure TR and a TR+CNTs mixed matrix membranes. </LI> <LI> Aging behavior of a pure TR and a TR+CNTs mixed matrix membranes. </LI> <LI> No significant difference observed in aging behavior of TR+CNT membrane with respect to pure TR membrane. </LI> <LI> TR+CNTs mixed matrix membrane more permeable and selective than pure TR membrane. </LI> </UL> </P>
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Handwriting Rehabilitation in Parkinson Disease: A Pilot Study
Adriana Ziliotto,Maria G. Cersosimo,Federico E. Micheli 대한재활의학회 2015 Annals of Rehabilitation Medicine Vol.39 No.4
Objective To assess the utility of handwriting rehabilitation (HR) in Parkinson disease (PD) patients who experienced difficulties with handwriting and signing.Methods Sixty PD patients were prospectively studied with graphological evaluations. Thirty PD patients were assigned to HR for 9 weeks. At the end of this training, all patients were evaluated again and results of basal vs. final evaluations were compared.Results At final evaluation, the group assigned to HR showed significantly larger amplitude of the first ‘e’ in the phrase, larger signature surface area, and superior margin. A trend of increase in letter size was also observed. Handwriting with progressively decreasing size of letters and ascending direction with respect to the horizontal were prominent findings in both groups of patients and they did not change after HR.Conclusion Rehabilitation programs for handwriting problems in PD patients are likely to be helpful. Larger randomized studies are needed to confirm these results.
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