两组双对称Gemini咪唑鎓表面活性剂,[C 14 C 4 C m im] Br 2(m = 10、12、14 )和[C m C 4 C n im] Br 2(m + n = 24,m = 12合成了14、16、18)表面活性剂,并通过1 H NMR和ESI-MS光谱确认了其结构。通过表面张力,电导率和稳态荧光探索了它们在空气/水界面的吸附,热力学参数和聚集行为。一系列表面活性参数,包括cmc,γCMC,π CMC,对Ç 20,CMC / Ç 20,Γ最大和甲分钟,从表面张力的测量而获得。结果表明,[C 14 C 4 C m im] Br 2的总疏水链长度(N c)和[C m C 4 C n im] Br 2的不对称性(m / n)对表面活性。cmc值随着N c的增加而降低或m / n。胶束的热力学参数(Δ g ^米θ,Δ ħ米θ,Δ小号米θ)从导电性衍生表明,[C的胶束化过程14 Ç 4
Influence of Glutaraldehyde Cross-Linking Modes on the Recyclability of Immobilized Lipase B from Candida antarctica for Transesterification of Soy Bean Oil
作者:Iago A. Modenez、Diego Sastre、Fernando C. Moraes、Caterina Marques Netto
DOI:10.3390/molecules23092230
日期:——
CAL-B enzyme was not able to catalyze transesterification due to the high methanol concentration; however, the immobilized CAL-B enzyme reached yields from 79.7 to 90% at the same conditions. In addition, the transesterification of lipids isolated from oleaginous yeasts achieved 89% yield, which confirmed the potential of immobilized CAL-B enzyme in microbial production of biodiesel.
Synthesis of Novel Chiral Ionic Liquids and Their Phase Behavior in Mixtures with Smectic and Nematic Liquid Crystals
作者:Martin Tosoni、Sabine Laschat、Angelika Baro
DOI:10.1002/hlca.200490247
日期:2004.11
(3e) and 1-citronellylpyridinium bromide (6) (Table). In binary mixtures with smectic and nematicliquidcrystals 9 and 10, 1-citronellyl-3-methyl-1H-imidazolium bromide (3a) behaved differently. Increasing quantities of 3a cause a decrease of the smectic-phase width for the mixture 3a/9 (Fig. 3), whereas the phase width of the nematicphase for 3a/10 remained nearly constant (Fig. 4).
Symmetrical 1,3‐Dialkylimidazolium Based Ionic Liquid Crystals
作者:Rondla Rohini、Ching‐Kuan Lee、Jung‐Tang Lu、Ivan J. B. Lin
DOI:10.1002/jccs.201200598
日期:2013.7
rod‐like imidazoliumsalts, is assigned. Studies from powder X‐ray diffraction suggest a lamellar structure with noninterdigitated monolayer arrangement for the LC salts in the mesophase. In addition, a short note on the structure and property relationship for rod‐like, disc‐ or fan‐like, and dendritic shaped imidazoliumionicliquid crystals (ImILCs) forming smectic, columnar, and cubic phase is briefly
The use of ionic liquids as functional building blocks based on pyridinium, imidazolium and phosphonium cations to achieve materials combining a structuration at nanoscale with the dramatic mechanical properties of the resulting ionomers has been successfully demonstrated for the first time in a fluorinated matrix.