http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Di Nicolo, Rebeca (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
미세다공성 PVDF 분리막의 형성 중 열 유도 상전이 변수들의 영향
왕호현,정준태,김정,Emanuele di Nicolo,Enrico Drioli,이영무 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.11
The thermally induced phase separation(TIPS) method offers higher reproducibility with lower tendency for defect formation and narrower pore size distribution, rendering the method more suitable for microfiltration(MF) and ultrafiltration(UF) applications. PVDF is widely used in membrane technology due to their excellent chemical resistance and strong mechanical properties. In case of MF and UF applications, the stretching method has been applied for increasing the performance of membrane by extending pore size. In this work, the effects of dope and bore flow rates and dope composition on the tensile strength of membranes was investigated. A design of experiment(DOE) analysis was used to understand the effects of the stretching parameters such as temperature, stretching ratio and holding time on the membrane performance.
-
열 유도 상전이와 비 용매 상전이 현상을 이용한 막 형태의 조절
정준태,김정,왕호현,Emanuele di Nicolo,Enrico Drioli,이영무 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.11
Since Loeb and Sourirajan has introduced phase inversion method for membrane fabrication, the phase separation technique became the mainstream of membrane fabrication methods. Phase inversion includes solvent evaporation, vapor induced phase separation, thermally induced phase separation (TIPS) and nonsolvent induced phase separation (NIPS). Among those, NIPS and TIPS process is widely studied and employed for membrane fabrication. Depending on the membrane fabrication processes such as NIPS and TIPS, corresponding morphology differs from macrovoid structure to spherulitic structure, respectively. In this presentation, comparison of NIPS and TIPS effect on the final membrane morphology and controlling the membrane morphology by tuning the NIPS and TIPS effect will be presented.
-
Jung, J.T.,Kim, J.F.,Wang, H.H.,di Nicolo, E.,Drioli, E.,Lee, Y.M. Elsevier Scientific Pub. Co 2016 Journal of membrane science Vol.514 No.-
The thermally induced phase separation (TIPS) method is regaining momentum as a competitive platform to fabricate highly porous microporous membranes. In membrane technology, there has been an active search for more sustainable ways to fabricate polymeric membranes using green solvents. Rhodiasolv PolarClean® is a recently identified environmentally friendly TIPS solvent that shows high potential for the preparation of microporous PVDF membranes. Interestingly, its high miscibility with water induces a nonsolvent-induced phase separation (NIPS) effect on the membrane surface and this simultaneous NIPS-TIPS effect is referred to as the combined NIPS-TIPS (N-TIPS) method. In this work, a thorough investigation was carried out to understand the underlying phenomena in the membrane formation kinetics during the N-TIPS process. It was found that the NIPS and TIPS morphology can be tailored to control the mechanical properties, pore size distribution, and flux of the prepared membranes. For instance, increasing the coagulation bath solvent concentration facilitated the formation of a spherulitic morphology, whereas increasing the bath temperature induced the formation of a bicontinuous morphology free of macrovoids. It was determined that by controlling the phase separation kinetics, the mechanical properties of the prepared PVDF membranes could be remarkably improved from 0.9MPa to 6.1MPa. Several pore-forming additives including polyvinylpyrrolidone, Pluronics F-127, LiCl, and glycerol were employed to induce surface pores and their effects were thoroughly characterized. The membranes prepared with Pluronic additives exhibited high water permeabilities up to 2800Lm<SUP>-2</SUP>h<SUP>-1</SUP>bar<SUP>-1</SUP> with narrow pore size distributions.
-
da Rocha, Daniel Maranha,Tribst, Joao Paulo Mendes,Ausiello, Pietro,Dal Piva, Amanda Maria de Oliveira,Rocha, Milena Cerqueira da,Di Nicolo, Rebeca,Borges, Alexandre Luiz Souto The Korean Academy of Conservative Dentistry 2019 Restorative Dentistry & Endodontics Vol.44 No.3
Objectives: To evaluate the influence of the restorative technique on the mechanical response of endodontically-treated upper premolars with mesio-occluso-distal (MOD) cavity. Materials and Methods: Forty-eight premolars received MOD preparation (4 groups, n = 12) with different restorative techniques: glass ionomer cement + composite resin (the GIC group), a metallic post + composite resin (the MP group), a fiberglass post + composite resin (the FGP group), or no endodontic treatment + restoration with composite resin (the CR group). Cusp strain and load-bearing capacity were evaluated. One-way analysis of variance and the Tukey test were used with ${\alpha}=5%$. Finite element analysis (FEA) was used to calculate displacement and tensile stress for the teeth and restorations. Results: MP showed the highest cusp (p = 0.027) deflection ($24.28{\pm}5.09{\mu}m/{\mu}m$), followed by FGP ($20.61{\pm}5.05{\mu}m/{\mu}m$), CR ($17.62{\pm}7.00{\mu}m/{\mu}m$), and GIC ($17.62{\pm}7.00{\mu}m/{\mu}m$). For load-bearing, CR ($38.89{\pm}3.24N$) showed the highest, followed by GIC ($37.51{\pm}6.69N$), FGP ($29.80{\pm}10.03N$), and MP ($18.41{\pm}4.15N$) (p = 0.001) value. FEA showed similar behavior in the restorations in all groups, while MP showed the highest stress concentration in the tooth and post. Conclusions: There is no mechanical advantage in using intraradicular posts for endodontically-treated premolars requiring MOD restoration. Filling the pulp chamber with GIC and restoring the tooth with only CR showed the most promising results for cusp deflection, failure load, and stress distribution.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
