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COSMO-RS prediction, experimental investigation, and mechanism analysis: A new approach to separating the n-hexane - tert-butanol azeotropic system via liquid-liquid extraction with ionic liquids COSMO-RS 预测、实验研究和机理分析:利用离子液体进行液-液萃取分离正己烷-叔丁醇共沸体系的新方法
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-09 DOI: 10.1016/j.molliq.2024.126455
Yu Sheng, Qinqin Zhang, Hua Xin, Zhifeng Cong, Zhigang Zhang
n-Hexane and tert-Butanol (TBA) are frequently utilized to refine the conditions for Grignard, Wittig, and Friedel-Crafts alkylation reactions. During the synthesis of loratadine, the formation of azeotropic mixtures n-hexane and TBA, which are challenging to separate through conventional distillation, is inevitable. This study utilizes the COSMO-RS model to identify suitable ionic liquids (ILs) for the separation of the n-hexane - TBA azeotropic system. Based on solvent capacity and selectivity, 1-ethyl-3-methylimidazolium trifluoroacetate ([EMIM][TFA]), 1-butyl-3-methylimidazolium trifluoroacetate ([BMIM][TFA]), and 1-hexyl-3-methylimidazolium trifluoroacetate ([HMIM][TFA]) were selected as extractants. The liquid–liquid equilibrium (LLE) data for the n-hexane - TBA - ILs ternary system were measured at 303.15 K and atmospheric pressure. Distribution coefficients and selectivity were calculated to evaluate the performance of the extractants, with the NRTL model used to correlate the experimental LLE data. The consistency of the NRTL model parameters was corroborated through topological analysis associated with the Gibbs tangent principle. Quantum chemical calculations, including interaction energy, ESP analysis, IGMH analysis, and QTAIM topological analysis, were performed to explore the separation mechanism at the molecular level. The results indicated that the interaction energies between the ILs and TBA were higher than those between the ILs and n-hexane, indicating a stronger attraction of ILs to TBA. Consequently, the ILs effectively separated TBA from the n-hexane - TBA azeotropic system, with extraction capacities ranked as [EMIM][TFA] > [BMIM][TFA] > [HMIM][TFA]. The quantum chemical calculations successfully explained the experimental results, aligning with COSMO-RS model predictions and confirming their reliability. IGMH and QTAIM topological analyses systematically explored the types and strengths of interactions, revealing that hydrogen bonds are predominant between the ILs and TBA, with additional contributions from van der Waals forces. Furthermore, the hydrogen bond strengths between TBA and the anions and cations of the ILs are classified as strong and moderate, respectively. This work provides valuable insights into the separation of azeotropic systems using ILs, elucidating the underlying mechanisms behind this process.
正己烷和叔丁醇(TBA)经常被用来完善格氏、维氏和弗里德尔-卡夫斯烷基化反应的条件。在合成氯雷他定的过程中,不可避免地会形成共沸混合物正己烷和叔丁醇,而通过传统蒸馏法分离这两种混合物非常困难。本研究利用 COSMO-RS 模型确定了适合分离正己烷-TBA 共沸体系的离子液体 (IL)。根据溶剂容量和选择性,选择了1-乙基-3-甲基咪唑三氟乙酸盐([EMIM][TFA])、1-丁基-3-甲基咪唑三氟乙酸盐([BMIM][TFA])和1-己基-3-甲基咪唑三氟乙酸盐([HMIM][TFA])作为萃取剂。在 303.15 K 和大气压力下测量了正己烷 - TBA - ILs 三元体系的液液平衡(LLE)数据。通过计算分配系数和选择性来评估萃取剂的性能,并使用 NRTL 模型来关联 LLE 实验数据。通过与吉布斯正切原理相关的拓扑分析,证实了 NRTL 模型参数的一致性。为探索分子水平的分离机制,进行了量子化学计算,包括相互作用能、ESP 分析、IGMH 分析和 QTAIM 拓扑分析。结果表明,ILs 与 TBA 之间的相互作用能高于 ILs 与正己烷之间的相互作用能,这表明 ILs 对 TBA 具有更强的吸引力。因此,ILs能有效地将TBA从正己烷-TBA共沸体系中分离出来,萃取能力依次为[EMIM][TFA] > [BMIM][TFA] > [HMIM][TFA]。量子化学计算成功地解释了实验结果,与 COSMO-RS 模型的预测一致,证实了其可靠性。IGMH 和 QTAIM 拓扑分析系统地探讨了相互作用的类型和强度,揭示了 IL 与 TBA 之间以氢键为主,范德华力也有贡献。此外,TBA 与 IL 的阴离子和阳离子之间的氢键强度分别被划分为强和中等。这项研究为利用 IL 分离共沸体系提供了宝贵的见解,并阐明了这一过程背后的基本机制。
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引用次数: 0
A new semi-empirical correlation for the evaluation of the dynamic viscosity of nanofluids 用于评估纳米流体动态粘度的新半经验相关性
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-09 DOI: 10.1016/j.molliq.2024.126456
Gianluca Coccia, Feliciano Falcone
Thanks to their excellent heat transfer coefficient, nanofluids can be considered as ideal heat transfer fluids for a large number of relevant engineering and scientific applications. Precise assessments of their thermophysical properties are thus essential for reliable calculations. In this work, a new semi-empirical scaled correlation based on 8 parameters (volume fraction, temperature, base fluid critical temperature, base fluid density, base fluid critical density, nanoparticle diameter, base fluid molar mass, nanoparticle density) is introduced to evaluate the dynamic viscosity of nanofluids. The correlation is regressed and evaluated using a dynamic viscosity dataset for 32 nanofluids, including a total of 737 experimental points: 10 nanofluids have water as base fluid (Ag, Al2O3, Al2O3/CuO, C, CuO, diamond, Fe/Si, MWCNT, ND-Ni, TiO2), 6 nanofluids have ethylene glycol (Ag, Al2O3, CeO2, Co3O4, SiC, TiO2/CuO), 11 nanofluids comprise different mixtures of water and ethylene glycol (Al2O3, MWCNT/WO3, CB, fGnP, G/Dp, G/Dr, nD87, nD97, TiO2), 1 nanofluid has propylene glycol (SiC) and 4 nanofluids comprise different mixtures of water and propylene glycol (TiB2, TiB2/B4C, fGnP). The dynamic viscosity dataset was derived from experimental measurements documented in the scientific literature and conducted with samples that were prepared using consistent and reliable methods. The study evaluates the dynamic viscosity of nanofluids using 14 literature equations to verify their accuracy against the proposed correlation. Results show that the correlation has an average absolute relative deviation of 8.16%, which is significantly lower than that of the literature equations. A 4-fold cross-validation also shows that the correlation is resilient and accurate with different regression datasets.
由于具有出色的传热系数,纳米流体可被视为大量相关工程和科学应用的理想传热流体。因此,对其热物理性质的精确评估对于可靠的计算至关重要。在这项工作中,引入了一种基于 8 个参数(体积分数、温度、基流体临界温度、基流体密度、基流体临界密度、纳米粒子直径、基流体摩尔质量、纳米粒子密度)的新的半经验比例相关性,用于评估纳米流体的动态粘度。使用 32 种纳米流体的动态粘度数据集(包括总共 737 个实验点)对相关性进行了回归和评估:10 种纳米流体以水为基液(Ag, Al2O3, Al2O3/CuO, C, CuO, diamond, Fe/Si, MWCNT, ND-Ni, TiO2),6 种纳米流体以乙二醇为基液(Ag, Al2O3, CeO2, Co3O4, SiC, TiO2/CuO),11 种纳米流体由水和乙二醇的不同混合物组成(Al2O3、MWCNT/WO3、CB、fGnP、G/Dp、G/Dr、nD87、nD97、TiO2),1 种纳米流体含有丙二醇(SiC),4 种纳米流体含有水和丙二醇的不同混合物(TiB2、TiB2/B4C、fGnP)。动态粘度数据集来自科学文献中记载的实验测量结果,并使用一致可靠的方法制备样品。研究使用 14 个文献方程对纳米流体的动态粘度进行了评估,以根据所提出的相关性验证其准确性。结果表明,相关性的平均绝对相对偏差为 8.16%,明显低于文献方程。4 倍交叉验证也表明,在不同的回归数据集上,相关性具有弹性和准确性。
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引用次数: 0
New insight into molecular interactions of surface-active ionic liquid (SAIL) with some biomolecules: Experimental and computational approaches 表面活性离子液体 (SAIL) 与某些生物大分子分子相互作用的新见解:实验和计算方法
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-09 DOI: 10.1016/j.molliq.2024.126457
Ravinder Sharma , Pamita Awasthi , Neetika Kumari , Manu Vatsal , Arti Sharma , Ritu , Indra Bahadur , Mwadham M. Kabanda , Faruq Mohammad
Understanding the influence of ionic liquids (ILs) on the solubility of biomolecules in aqueous solutions is crucial for designing and optimizing novel biotechnological processes. However, the molecular-level mechanisms underlying this influence remain inconclusive and not fully elucidated. To contribute toward the understanding of molecular interactions between amino acids and ionic liquid in aqueous media, measurements of the densities and speeds of sound for L-serine and glycyl-L-serine in (0.00, 0.005, 0.01, 0.03, and 0.05) mol·kg−1 aqueous solutions of 1-octyl-3-methylimidazolium bromide were conducted at T = (288.15, 298.15, 308.15, and 318.15) K. From experimental data various thermodynamics paramours such as apparent molar volume (Vϕ), the partial molar volume (Vϕ0), standard partial molar volumes of transfer (ΔVϕ0) partial molar isentropic compression (Kϕ,s) and partial molar isentropic compression of transfer (ΔKϕ,S0) have been examined. Along with experiment results, computational tools were also utilized for a deeper understanding of the molecular changes. From density functional theory (DFT), the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) were calculated and utilized to obtain molecular descriptors such as ionization energy (I), electron affinity (A), hardness (η), softness (S), chemical potential (μ), and electronegativity (χ). Thermochemical properties, including change in enthalpy (ΔH), and change in Gibbs free energy (ΔG), were predicted. Molecular docking studies were used to analysis the molecular interaction of ionic liquid with I-Motif structure and structural changes.
了解离子液体(IL)对水溶液中生物分子溶解度的影响对于设计和优化新型生物技术过程至关重要。然而,这种影响的分子水平机制仍无定论,也未完全阐明。为了帮助理解氨基酸和离子液体在水介质中的分子相互作用,我们在 T = (288.15, 298.15, 309.15, 309.15) 温度下测量了 L-丝氨酸和甘氨酰-L-丝氨酸在 (0.00, 0.005, 0.01, 0.03, 0.05) mol-kg-1 的 1-辛基-3-甲基溴化咪唑水溶液中的密度和声速。根据实验数据研究了各种热力学参数,如表观摩尔体积 (Vϕ)、部分摩尔体积 (Vϕ0)、标准部分摩尔转移体积 (ΔVϕ0)、部分摩尔等熵压缩 (Kϕ,s) 和部分摩尔等熵压缩转移 (ΔKϕ,S0)。除实验结果外,还利用计算工具对分子变化进行了深入了解。通过密度泛函理论(DFT),计算并利用最高占有分子轨道(HOMO)和最低未占有分子轨道(LUMO)获得了分子描述符,如电离能(I)、电子亲和力(A)、硬度(η)、软度(S)、化学势(μ)和电负性(χ)。预测了热化学性质,包括热焓(ΔH)和吉布斯自由能(ΔG)的变化。分子对接研究用于分析离子液体与 I-Motif 结构的分子相互作用及结构变化。
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引用次数: 0
Probing host guest inclusion complex and its applications by biophysical approach subsequently optimized by molecular docking 通过生物物理方法探测主客体包合物及其应用,然后通过分子对接进行优化
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-09 DOI: 10.1016/j.molliq.2024.126464
Biswajit Ghosh , Niloy Roy , Debadrita Roy , Shreya Chakraborty , Archita Paul , Subhajit Debnath , Pranish Bomzan , Vikas Kumar Dakua , Ashutosh Dutta , Biswajit Datta , Biswajit Sinha , Mahendra Nath Roy
Herein, we explored the construction of a supramolecular encapsulated complex between Nile blue (NB) and p-sulfonatothiacalix[4]arene (TSC4X). The developed inclusion complex (NB-TSC4X) was established by fluorescence spectroscopy, TGA, FTIR, 1H NMR, and Docking studies. Benesi-Hildebrand calculation showed a linear plot that indicated a 1:1 stoichiometric ratio having a fairly high stability constant of 2720 M−1 in the solution phase. Docking analysis helps us to find out the optimized structure of the inclusion complex. Finally, the binding interaction of the inclusion complex with bovine serum albumin (BSA) was evaluated. In brief, this work uncloses a new strategy to enhance the performance of fluorescent dye.
在此,我们探索了尼罗蓝(NB)与对磺酰基硫杂[4]炔(TSC4X)之间超分子包合物的构建。通过荧光光谱、TGA、傅立叶变换红外光谱、1H NMR 和 Docking 研究,确定了所开发的包合物(NB-TSC4X)。贝尼尼-希尔德布兰德计算显示出的线性图表明,1:1 的化学计量比在溶液相中具有相当高的稳定性常数(2720 M-1)。Docking 分析有助于我们找到包合物的优化结构。最后,还评估了包合物与牛血清白蛋白(BSA)的结合相互作用。简而言之,这项研究揭示了一种提高荧光染料性能的新策略。
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引用次数: 0
The synergetic collecting effect of N-oleoyl sarcosine (N-OSS) and dodecylamine (DDA) on the selective flotation of spodumene from albite N-油酰基肌氨酸(N-OSS)和十二胺(DDA)对从白云石中选择性浮选黝帘石的协同收集效应
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-08 DOI: 10.1016/j.molliq.2024.126466
Hui Shao , Bingqiao Yang , Huihua Luo , Ruiqi Ge , Jie Wu
In this study, N-OSS combined with DDA was examined as an novel collector. The collecting performances and their synergetic interaction mechanisms were investigated comprehensively. The micro-flotation results illustrated N-OSS/DDA exhibited excellent selectivity on separation without pre-activation. Contact angle tests revealed N-OSS/DDA could selectively enhance the hydrophobicity of spodumene, whereas, they barely affected that of albite. FTIR, SEM-EDS and Zeta potential revealed N-OSS/DDA might co-adsorb on spodumene surface rather than that of albite. XPS analysis and DFT calculations inferred the O1 2p orbitals of -COO- within N-OSS could bond with Al 3s orbitals and the -NH3+ groups of DDA adsorbed onto spodumene surface via hydrogen bonding and electrostatic attraction. Meanwhile, the hydrogen bonding between N-OSS and DDA promoted the co-adsorption on spodumene surface. While N-OSS/DDA weakly adsorbed on albite surface through physical adsorption. N-OSS/DDA exhibited outstanding floatability, which maybe a good substitute for conventional collectors in future.
本研究将 N-OSS 与 DDA 结合作为一种新型收集器进行了研究。研究全面考察了它们的收集性能及其协同作用机制。微浮选结果表明,N-OSS/DDA 无需预活化即可表现出优异的分离选择性。接触角测试表明,N-OSS/DDA 可选择性地增强黝帘石的疏水性,而对白云石的疏水性几乎没有影响。傅立叶变换红外光谱(FTIR)、扫描电子显微镜(SEM-EDS)和 Zeta 电位显示,N-OSS/DDA 可能会共同吸附在刚玉表面,而不是白云石表面。XPS 分析和 DFT 计算推断,N-OSS 中 -COO- 的 O1 2p 轨道可与 Al 3s 轨道结合,DDA 的 -NH3+ 基团通过氢键和静电吸引吸附在白云石表面。同时,N-OSS 和 DDA 之间的氢键作用促进了它们在刚玉表面的共吸附。而 N-OSS/DDA 则通过物理吸附作用弱地吸附在白云石表面。N-OSS/DDA 具有出色的可浮性,也许是未来传统收集器的良好替代品。
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引用次数: 0
Tension ring-functionalized bicyclic ammonium ionic liquids as hypergolic fuels with superior energy density 张力环功能化双环铵离子液体作为高能量密度燃料
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-08 DOI: 10.1016/j.molliq.2024.126445
Tianhao Xie , Yuan Yao , Xiaofang Yang , Long Liu , Peihao Dou , Yanqiang Zhang
Hypergolic ionic liquids are a new type of liquid propellants, and the energy density is critical to propulsion performance. We propose to combine cage structures with tensile rings to design and synthesize new ionic liquid molecules. Cycloalkane-substituted 1-aza-bicyclo[2.2.2]octane and 1,4-diazabicyclo[2.2.2]octane-like ionic liquids were synthesized using dicyanamide root as an anion, and their structure and properties were determined. The obtained ionic liquids possess higher energy density up to 1.87 kJ·mL−1. The three-membered ring substituent can increase the energy density of ionic liquids by 79.8 % and reduce the ignition delay time by 52.5 % than that of straight-chain alkanes. This work provides an important basis for the design and synthesis of the new type of hypergolic ionic liquids.
超醇离子液体是一种新型液体推进剂,其能量密度对推进性能至关重要。我们建议将笼式结构与拉伸环结合起来,设计和合成新型离子液体分子。我们以二氰胺根为阴离子,合成了环烷取代的 1-aza-bicyclo[2.2.2]octane 和 1,4-diazabicyclo[2.2.2]octane 类离子液体,并测定了它们的结构和性质。所获得的离子液体具有较高的能量密度,最高可达 1.87 kJ-mL-1。与直链烷烃相比,三元环取代基可使离子液体的能量密度提高 79.8%,点火延迟时间缩短 52.5%。这项工作为设计和合成新型高庚醇离子液体提供了重要依据。
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引用次数: 0
Hydrogels as versatile colloidal platforms to combat skin cancer – Physicochemical features, strategies and advances 水凝胶作为抗击皮肤癌的多功能胶体平台--物理化学特征、策略和进展
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-08 DOI: 10.1016/j.molliq.2024.126453
Rui L. Machado , Andreia C. Gomes , Eduardo F. Marques
The incidence of skin cancer is rising globally. Hydrogels are among the most extensively studied systems in the plight to combat this disease due to their unique features—such as versatility, biocompatibility, capacity for stimuli-responsiveness, common non-invasiveness, photodynamic therapy capability, and ability to contain smaller delivery structures embedded—and their potential for continuous enhancement. Herein, we review the major strategies and findings concerning the development of hydrogel-based colloidal systems for skin cancer treatment, dividing the literature into three main areas: hydrogels as direct drug delivery systems; hydrogels as scaffolds for drug-loaded nanostructures and sensitizers; and hydrogels in the form of nanogels. Hydrogels have been employed as slow-release drug reservoirs, which can be administered topically or injected directly into the tumor mass, yielding potent anticancer effects. Hydrogel scaffolds embedded with drug-loaded nanostructures—encompassing vesicles, micelles, emulsions or nanocapsules—have emerged as hybrid systems that significantly enhance bioavailability at the tumor site, demonstrating high efficacy against skin cancer. Additionally, solid nanoparticles benefit greatly from the hydrogel network, which serves not only as a scaffold to enhance photothermal therapy but also as a bioactive compound, promoting cancer cell death and wound healing. Finally, nanogels are highly adaptable and effective systems against metastization as they can be administered intravenously. We conclude by presenting perspectives on future directions in this field and challenges yet to be addressed.
全球皮肤癌发病率不断上升。水凝胶因其独特的特性--如多功能性、生物相容性、刺激反应能力、常见的无创伤性、光动力治疗能力和嵌入较小输送结构的能力--及其持续增强的潜力,成为抗击这种疾病的研究最广泛的系统之一。在此,我们回顾了有关开发用于皮肤癌治疗的水凝胶胶体系统的主要策略和研究成果,并将文献分为三个主要领域:作为直接给药系统的水凝胶;作为载药纳米结构和敏化剂支架的水凝胶;以及纳米凝胶形式的水凝胶。水凝胶已被用作缓释药物储库,可局部给药或直接注射到肿瘤组织中,产生强大的抗癌效果。水凝胶支架嵌入了载药纳米结构--包括囊泡、胶束、乳液或纳米胶囊--已成为一种混合系统,可显著提高肿瘤部位的生物利用度,对皮肤癌具有很高的疗效。此外,固体纳米粒子从水凝胶网络中获益匪浅,因为水凝胶网络不仅是加强光热疗法的支架,还是一种生物活性化合物,可促进癌细胞死亡和伤口愈合。最后,纳米凝胶具有很强的适应性,可以静脉注射,是一种有效的抗变态反应系统。最后,我们对这一领域的未来发展方向和有待解决的挑战进行了展望。
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引用次数: 0
Catalytic properties of selenium and phosphorus ionic liquids heterogenized on algae-based biochar 硒和磷离子液体在藻基生物炭上的异质化催化特性
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-08 DOI: 10.1016/j.molliq.2024.126458
Ivaylo Tankov , Lenia Gonsalvesh , Ganka Kolchakova , Zilya Mustafa , Antonia Ilieva , Yancho Hristov
Catalytic performance of pyridinium hydrogen selenate (PHSe) and pyridinium dihydrogen phosphate (PH2P) ionic liquids immobilized on algae-based biochar (AC) was studied for the first time. For that purpose, acetic acid esterification with butanol was used as a test reaction. To investigate the surface effects, textural properties and thermal behavior for PHSe/AC and PH2P/AC, physicochemical methods such as X-ray powder diffraction (XRD), nitrogen adsorption–desorption isotherms (SBET) scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) were applied. In addition, influence of the catalyst content (5–12 wt%) and reaction temperature (60–80 °C) on the butyl acetate yield and rate constant of esterification were evaluated. SBET and SEM measurements revealed that all of the samples (AC, PHSe/AC and PH2P/AC) obtained are mixed microporous-mesoporous materials. XRD and XPS data showed more highly dispersed PH2P particles than PHSe on the carrier surface due to stronger surface ionic liquid-support interaction for PH2P/AC in comparison with PHSe/AC. The latter was responsible for higher thermal stability of PH2P/AC with respect to PHSe/AC. In addition, more obvious PH2P sites (than PHSe) on the biochar surface favored the ester production in the presence of PH2P/AC (77.4 % and 53.26 × 10−4 l/mol × min) more evidently than PHSe/AC (58.1 % and 28.82 × 10−4 l/mol × min).
首次研究了固定在藻基生物炭(AC)上的硒酸吡啶鎓(PHSe)和磷酸二氢吡啶鎓(PH2P)离子液体的催化性能。为此,将乙酸与丁醇的酯化反应作为试验反应。为了研究 PHSe/AC 和 PH2P/AC 的表面效应、质地特性和热行为,应用了 X 射线粉末衍射(XRD)、氮吸附-脱附等温线(SBET)、扫描电子显微镜(SEM)、X 射线光电子能谱(XPS)、热重分析(TGA)和差示扫描量热法(DSC)等理化方法。此外,还评估了催化剂含量(5-12 wt%)和反应温度(60-80 °C)对乙酸丁酯产率和酯化速率常数的影响。SBET 和 SEM 测量显示,获得的所有样品(AC、PHSe/AC 和 PH2P/AC)都是微孔-多孔混合材料。XRD 和 XPS 数据显示,与 PHSe/AC 相比,PH2P/AC 的表面离子液体-支撑相互作用更强,因此载体表面的 PH2P 颗粒比 PHSe 颗粒分散度更高。后者是 PH2P/AC 热稳定性高于 PHSe/AC 的原因。此外,PH2P/AC(77.4% 和 53.26 × 10-4 l/mol × min)比 PHSe/AC (58.1% 和 28.82 × 10-4 l/mol × min)更明显地促进了生物炭表面更明显的 PH2P 位点(而不是 PHSe)。
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引用次数: 0
Electric field stimulation on electronic, electro-optical and non-linear optical properties of some fluoro-isothiocyanate and fluorinated alkyl terphenyl liquid crystals: A comparative DFT approach 电场对某些氟异硫氰酸酯和氟化烷基三联苯液晶的电子、电光和非线性光学特性的影响:DFT 比较方法
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-08 DOI: 10.1016/j.molliq.2024.126452
Sugriva Nath Tiwari , Madan Singh Chauhan , Gargi Tiwari , Dipendra Sharma
Employing density functional theory, electronic, electro-optical, and NLO properties of some fluorinated NCS terphenyl and fluorinated terphenyl liquid crystals have been investigated in the presence of static electric field. Two DFT functionals, in this study, includes M06-2X and ωB97XD combined with 6–311+G(d,p) basis set have been used. All the computations have been performed on Gaussian 16W program and visualized on GaussView 6.0. A comparative analysis of computational outcomes has been done in order to forecast mesogens’ improved electronic characteristics, global descriptors, NLO properties and UV–vis spectra. All of the chosen LC molecules exhibit properties that make them suitable materials for NLO applications.
利用密度泛函理论,研究了一些氟化 NCS 三联苯和氟化三联苯液晶在静态电场存在下的电子、电光和 NLO 特性。本研究使用了两种 DFT 函数,包括 M06-2X 和 ωB97XD 以及 6-311+G(d,p) 基集。所有计算均在高斯 16W 程序上进行,并在 GaussView 6.0 上实现可视化。对计算结果进行了比较分析,以预测介质的改进电子特性、全局描述符、NLO 特性和紫外-可见光谱。所有被选中的低浓分子都表现出了适合 NLO 应用的特性。
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引用次数: 0
Stimulated Pickering emulsion stabilized by binary particles with contrasting wettability and trace surfactant 由具有不同润湿性的二元颗粒和微量表面活性剂稳定的受激皮克林乳液
IF 5.3 2区 化学 Q2 CHEMISTRY, PHYSICAL Pub Date : 2024-11-08 DOI: 10.1016/j.molliq.2024.126429
Yulong Jiang , Xiuping Hu , Danhua Xie, Yuxin Liu, Xinru Chen, Fan Chen, Wenchang Zhao
The investigationof self-assembled particle structures at fluid interfaces has gained considerable interest across various fields. In particular, Pickering emulsions (PEs) stabilized by binary particles co-assembling at these interfaces have attracted even more attention. To explore the self-assembly process of superhydrophobic and superhydrophilic particles at oil–water (O/W) interfaces influenced by a trace amount of surfactant, a series of experiments were conducted. A small quantity (0.01 mmol·L−1) of dodecyltrimethylammonium bromide (DTAB) was introduced, establishing a variable stable emulsion system with high salt tolerance, capable of withstanding up to 6 mol·L−1 NaCl, in synergism with the particles. The DTAB concentration required to stabilize the O/W emulsion with particles was as low as 0.001 mmol·L−1. The stability and type of the resulting emulsion could be adjusted by varying the ratio of hydrophobic to hydrophilic particle (R) or by modifying acid/base conditions. The systems exhibited robust cyclic acid/base regulated demulsification and phase inversion behavior, maintaining stability over at least 10 cycles. Results indicated that the stability and nature of the emulsion were influenced by the curvature of the interface formed by the self-assembled interfacial particle structures, arising from the competitive adsorption of both types of particles and trace surfactant. Further analysis revealed a correlation between interfacial curvature and the surface charges of the particles, which could be modulated through DTAB adsorption. This study elucidated the behavior of hydrophilic and hydrophobic particle self-assembly at interfaces, provided a straightforward strategy for co-preparing switchable emulsions using superhydrophilic and superhydrophobic particles, and expanded the range of amphiphilic particles available for producing PEs. This approach presents significant potential for future research and applications in the field of PEs.
对流体界面自组装颗粒结构的研究在各个领域都引起了相当大的兴趣。特别是由在这些界面上共同组装的二元颗粒稳定的皮克林乳液(PEs)引起了更多的关注。为了探索超疏水和超亲水粒子在油-水(O/W)界面上受微量表面活性剂影响的自组装过程,我们进行了一系列实验。实验中引入了少量(0.01 mmol-L-1)十二烷基三甲基溴化铵(DTAB),在与颗粒的协同作用下建立了一个具有高耐盐性的可变稳定乳液体系,能够承受高达 6 mol-L-1 的 NaCl。稳定含颗粒的 O/W 型乳液所需的 DTAB 浓度低至 0.001 mmol-L-1。可以通过改变疏水粒子与亲水粒子的比例(R)或改变酸碱条件来调整所产生的乳液的稳定性和类型。这些体系表现出强劲的循环酸/碱调节破乳和相反转行为,至少在 10 个循环中保持稳定。结果表明,乳液的稳定性和性质受到自组装界面颗粒结构所形成的界面曲率的影响,这种曲率是由两种类型的颗粒和痕量表面活性剂的竞争性吸附所产生的。进一步的分析表明,界面曲率与颗粒表面电荷之间存在相关性,而颗粒表面电荷可通过 DTAB 吸附进行调节。这项研究阐明了亲水和疏水粒子在界面上的自组装行为,为使用超亲水和超疏水粒子共同制备可切换乳液提供了一种简单易行的策略,并扩大了可用于生产聚乙烯的两亲粒子的范围。这种方法为 PE 领域的未来研究和应用提供了巨大的潜力。
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Journal of Molecular Liquids
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