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FTIR investigation of the interfacial properties and mechanisms of CO_(2) sorption in porous ionic liquids

green Chemical Engineering 2021年第4期2卷 392-401页

作者： Jennifer A.Schott Chi-Linh Do-Thanh Weida Shan nicolette g.puskar Sheng Dai Shannon M.Mahurin Department of Chemistry Joint Institute for Advanced MaterialsUniversity of TennesseeKnoxvilleTN37996USA Chemical Sciences Division Oak Ridge National LaboratoryOak RidgeTN37831USA

Porous liquids,which are liquids with permanent porosity,have received significant attention as a new class of materials with the potential for far-reaching impacts in a variety of applications including gas *** this work,in situ Fourier transform infrared spectroscopy measurements were conducted to investigate the mechanism of carbon dioxide absorption in a porous ionic liquid consisting of ZIF-8 combined with 8,80-(3,6-dioxaoctane-1,8-diyl)bis(1,8-diazabicyclo[5.4.0]undec-7-en-8-ium)bis(trifluoromethanesulfonyl)imide([DBU-PEg][(Tf_(2)N)_(2)]).While the vibrational modes of the pure ionic liquid remain relatively unchanged,the incorporation of carbon dioxide leads to slight structural fluctuations in the ZIF-8 framework whether it is pure solid or as integrated into the porous ionic *** analysis of the vibrational modes of the porous ionic liquid suggests that the interaction of the CO_(2) occurs more strongly with the ring structure of the ZIF-8 *** splitting of the asymmetric stretch of the CO_(2) into multiple peaks upon sorption indicate the presence of multiple environments,which could be a combination of free and physisorbed CO_(2) or simply multiple binding sites within the porous ionic liquid.A better understanding of gas sorption mechanisms in this unique material could lead to new porous ionic liquids with enhanced separations properties.

关键词： Porous ionic liquids CO_(2)separation Infrared spectroscopy gas-liquid interactions

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Motility of Stallion Spermatozoa after Centrifugation and Cooling in INRA96 or Walworth Extender

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Journal of Agricultural Science and Technology(A) 2016年第2期6卷 143-147页

作者： gabrielle nicolette Riccio Robyn Ellienne Ellerbrock Igor Frederico Canisso Robert Victor Knox Kevin Halden Kline Department of Animal Sciences University of Illinois Urbana-Champaign 1207 West Gregory Drive Urbana IL 61801 USA Department of Veterinary Clinical Medicine College of Veterinary Medicine University of Illinois Urbana-Champaign Urbana IL 61801 USA

A total of 18 ejaculates were collected, once per week, from six fertile stallions for three consecutive weeks in October and November, to compare motility over time between extenders using four semen processing treatments. Four total aliquots of semen were used. Two aliquots of each semen collection were extended in either INRA96 or an experimental proprietary milk-based extender Walworth （WW） extender, and each was designed for multi-day storage of fresh chilled semen. Each aliquot was divided again, and either centrifuged at 600 μg for 10 min without cushion, or not centrifuged and extended to a final concentration of 25 × 10^6 spermatozoa/mL. The treatments evaluated were INRA96 without centrifugation （INRA-NC） or with centrifugation （INRA-C）, and Walworth extender without centrifugation （WW-NC） or with centrifugation （WW-C）. Total and progressive motility were measured using Sperm Vision~ CASA at 0, 24, 48 and 72 h post-collection. Samples were stored at 4 ℃. No differences were found between extenders in progressive （P = 0.13） or total motility （P = 0.14） over the four different time points without centrifugation. However, ejaculates processed in INRA-C group had the greater total and progressive motility （P 〈 0.05） over the four time points than ejaculates in the WW-C group. It was found that centrifugation and re-suspension of stallion semen in INRA96 improved the longevity of fresh chilled semen. However, when not using centrifugation, the Walworth extender proved to be as effective for maintaining spermatozoa motility across all time points as 1NRA96 , and may be an alternative for use in the equine breeding industry.

关键词： Stallion semen extender centrifugation fresh chilled.

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