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RISS 인기검색어
- 검색키워드
- 저자 : Simar Sethi (검색결과 2 건)
- 무료
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- 유료
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Structure and Thermodynamics of Hybrid Organic-Inorganic Diblock Copolymers with Salt
Sethi, Gurmukh K.,Jung, Ha Young,Loo, Whitney S.,Sawhney, Simar,Park, Moon Jeong,Balsara, Nitash P.,Villaluenga, Irune American Chemical Society 2019 Macromolecules Vol.52 No.9
<P>We examine the phase behavior of a hybrid organic-inorganic diblock copolymer/salt mixtures. The experimental system comprises poly(ethylene oxide)-<I>block</I>-polyhedral oligomeric silsesquioxane (PEO-POSS) mixed with a lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) salt. Although the diblock copolymers without salt exhibit a classical order-to-disorder transition behavior with increasing temperature, the PEO-POSS/salt mixtures exhibit disorder-to-order transitions with increasing temperature. The analysis of a small-angle X-ray scattering data from the disordered state using Leibler’s random phase approximation enables the determination of an effective Flory-Huggins interaction parameter, χ<SUB>eff</SUB>, for the electrolytes. Unlike conventional systems, χ<SUB>eff</SUB> increases with increasing temperature. A simple expression is proposed to describe the dependence of χ<SUB>eff</SUB> on temperature and salt concentration. This enables the calculation of the segregation strength, χ<SUB>eff</SUB><I>N</I>, for both ordered and disordered electrolytes. The composition of the electrolytes is quantified by <I>f</I><SUB>EO/LiTFSI</SUB>, the volume fraction of the salt-containing poly(ethylene oxide)-rich phase. The morphology of electrolytes is presented on a χ<SUB>eff</SUB><I>N</I> versus <I>f</I><SUB>EO/LiTFSI</SUB> phase diagram. Over the values of <I>f</I><SUB>EO/LiTFSI</SUB> studied (0.61-0.91), only two ordered phases were found: lamellae and co-existing lamellae/hexagonally packed cylinders.</P> [FIG OMISSION]</BR>
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Influence of vehicle for calcium hydroxide on postoperative pain: a scoping review
Kritika Aneja,Alpa Gupta,Dax Abraham,Vivek Aggarwal,Simar Sethi,Parul Chauhan,Arundeep Singh,Ansy Hanna Kurian,Sucheta Jala 대한치과마취과학회 2022 Journal of Dental Anesthesia and Pain Medicine Vol.22 No.2
This review aims to identify the influence of the vehicle and its concentration used to carry calcium hydroxide (Ca(OH)2) medicament on postoperative pain. The protocol for this review was registered in the open science framework (Registration DOI-10.17605/OSF.IO/ 4Y8A9) and followed the guidelines provided by the Joanna Briggs Institute. Reporting was based on the preferred reporting items for systematic reviews and meta-analyses extension for scoping reviews (PRISMA-ScR). Literature screening and searches were performed on PubMed/Medline, Scopus, and EBSCO hosts. Furthermore, additional records were manually analyzed using various sources. The selected studies were published in English and included the use of any vehicle adjunct to Ca(OH)2 to evaluate postoperative pain using qualitative and quantitative pain assessment tools. Descriptive analysis was conducted to review the study design, vehicle elements, and their effects. A preliminary search yielded 7584 studies, of which 10 were included. According to the data collected, the most commonly used Ca(OH)2 vehicles were chlorhexidine (CHX), normal saline, and camphorated paramonochlorophenol/glycerine (CPMC/glycerine), which had a significant effect on postoperative pain. Among the included studies, six evaluated the effect of CHX as a vehicle. It was observed that a higher concentration of the vehicle (2%) showed a favorable response in reducing postoperative pain. A majority of studies have validated a positive consequence of using a vehicle on postoperative pain. Although higher vehicle concentrations were found to alter postoperative pain levels, the data were insufficient to draw a firm conclusion. Our scoping review indicates that further clinical studies should focus on using different vehicles at various concentrations and application times to check for feasible and safe exposure in addition to providing pain relief.
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