JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Xiaomei Wang,Zhen Liu,Fa Zhou,Jianhan Huang
Imidazolium salt-incorporated postcross-linked porous polymers, namely, IL-PVB-pc-80%, were developed, and they were evaluated for the adsorption of rhodamine B (RB) and Cd2+ from aqueous solution. After N-vinylimidazole and p-dichloroxylene were inserted in the skeletons, IL-PVB-pc-80% contained both ionized imidazole moieties and plentiful mesopores. The adsorption experiments indicated that IL-PVB-pc-80% has excellent adsorption properties with a maximum capacity of 693.5 mg/g for RB and 373.3 mg/g for Cd2+. The adsorption mechanism revealed that the incorporated imidazolium salts were significantly beneficial for the adsorption.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2019
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IF 4.182
Yinpeng Wang,Junqi Nie,Cuifen Lu,Feiyi Wang,Chao Ma,Zuxing Chen,Guichun Yang
Polyimidazolium salts are a class of important catalysts for CO 2 cycloaddition with epoxides. However, initiator like azoisobutyronitrile or metal catalyst is often required to promote their synthetic process. Therefore, developing a clean route to synthesize polyimidazolium salts is still highly desirable. In this study, three crosslinked polymers PIM1, PIM2 and PIM3 containing imidazolium unit were constructed via nucleophilic substitution reaction of 1,3,5,7-tetrakis (4-(imidazole-1-yl)phenyl)adamantane and benzyl bromides. The structure and composition of the polymers were characterized by CP/MAS 13 C NMR, FT-IR and XPS. Different porosities were observed for PIMs, and PIM2 has a larger BET surface are than that of PIM1 and PIM3. Accordingly, the polymeric imidazolium salt PIM2 shows superior activity for catalyzing cyclic addition of CO 2 with a variety of epoxides without any solvent or cocatalyst, giving the cyclic carbonates in excellent yields. In addition, PIM2 shows high stability and easy recyclability.
研究领域:
化学
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材料科学
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DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2018
·Vol. 135
·期 6
·3005-3013
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IF 2.209
Luo Liqiong,Jin Bo,Peng Rufang,Shang Yu,Xiao Lipengcheng,Chu Shijin
A new nitrogen-rich energetic salt of bis-1-methylimidazole 1 H ,1′ H -5,5′-bistetrazole-1,1′-diolate salt, (1- M ) 2 BTO, was synthesized and characterized (FT-IR, 1 H NMR, 13 C NMR, elemental analysis, and X-ray single-crystal diffraction). Results indicated that (1- M ) 2 BTO crystallizes in the triclinic space group P -1. The thermal decomposition behavior of (1- M ) 2 BTO was determined by differential scanning calorimetry (DSC) and thermogravimetric tandem infrared spectroscopy. The decomposition peak temperature of (1- M ) 2 BTO was 530 K, which suggested that the salt is strong heat resistance. The apparent activation energies were 130.56 kJ mol −1 (Kissinger’s method) and 132.50 kJ mol −1 (Ozawa’s method), respectively. The enthalpy of formation for the salt was calculated as 917.3 kJ mol −1 . The detonation velocity and detonation pressure of (1- M ) 2 BTO were 7448 m s −1 and 20.7 GPa, respectively, using the Kamlet-Jacobs equation. Furthermore, the sensitivity test results showed that its impact sensitivity is greater than 50 J and friction sensitivity is 180 N, indicating that it has a lower sensitivity.
研究领域:
化学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2019
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IF 2.29
Pengshuai Zhang,Yameng Wan,Chi Zhang,Rui Zhao,Jiao Sha,Yu Li,Tao Li,Baozeng Ren
The solubility of solid compounds and active pharmaceutical ingredient in different solvents is important for its crystallization and purification industry. In this work, by using a laser dynamic method, the solubility of levamisole hydrochloride in methanol (MT), ethanol (ET), isopropanol (IPA), n-propanol (NPA), n-butanol (NBA), 2-butanol (SBA), isobutanol (IBA), n-pentanol (NPT), 3-methyl-1-butanol (IAA) and n-hexanol (NHA) from (283.15 to 323.15) K, dimethyl sulfoxide (DMSO) from (293.15 to 333.15) K and water from (283.15 to 308.15) K were measured under atmospheric pressure. The measured results showed that the experimental solubility of levamisole hydrochloride increased non-linearly with the temperature in the studied pure solvents. The measured solubility data were all correlated by the Yaws model equation, non-random two liquid (NRTL) model equation, universal quasi chemical (UNIQUAC) model equation, Wilson model equation and λh equation. Besides, the logarithm of activity coefficient of levamisole hydrochloride (lnγ 1 ) were calculated with the NRTL model, Wilson model and UNIQUAC model. The maximum relative average deviation ( ARD ) was 0.2008, the maximum root-mean-square deviation ( RMSD ) was 0.0089. Basically speaking, the measured solubility data in this study can be well correlated with the five thermodynamic models . Based on the solubility data and Wilson model, the mixing entropy, mixing enthalpy and mixing Gibbs energy were evaluated. The logarithm of the solute activity coefficients l n γ 1 in the studied saturated solutions were calculated, The positive values of l n γ 1 means that the repulsive interactions exist between levamisole hydrochloride and the corresponding solvents (NBA, NPA, NHA, IPA, IBA, SBA and IAA), and the solutions system positively deviate from Raoult’s law; The negative values of l n γ 1 means that the attractive interactions exist between levamisole hydrochloride and the corresponding solvents (MT, ET, NPT, DMSO and water), and the solutions system minus deviate from Raoult’s law. This work can give fundamental data for the crystallization and purification of levamisole hydrochloride.
研究领域:
药学
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物理化学
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产品关联
DOI
高影响因子
Small
·
2025
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IF 12.1
Bingqian Zhou,Yihao Fan,Chenyang Kou,Lei Zhang,Dezhong Yin,Baoliang Zhang
Poly-imidazolium salt (PIS) combines the merits of abundant nitrogen sources, excellent chemical and thermal stability and adjustable morphology, making it a promising precursor for Nitrogen-doped (N-doped) carbon material. Herein, multidimensional PIS are synthesized via a facile solvent-induced strategy. Then, PIS are converted into nanofibers, nanoribbons and microspheres composed of N-doped carbon. The effects of microstructure, N-doping degree and defects on microwave absorption properties are investigated in depth. As a result, the 2D nanoribbon CN-2-700 features a high specific surface area, significant N-doping and moderate conductivity, thereby allowing it to sustain perfect conductive networks and the optimal impedance matching at a low filler content (8 wt.%). CN-2-700 demonstrates a minimum reflection loss (RL min ) of −50.15 dB and an effective absorption bandwidth (EAB) of 7.06 GHz (10.44–17.50 GHz). Overall, this work offers a novel path for developing multi-dimensional electromagnetic microwave absorbing materials with a simple process and remarkable performance.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2023
·
IF 11.2
Wenqi Song,Liwei Qian,Zongcheng Miao,Valentin Nica,Yuzhen Zhao,Zemin He,Yanfang Zhu,Jianjing Gao,Xiaorui Li
With the increasing requirements for sustainable development and environmental protection, the design and development of bio-adsorbent based on the widely sourced cellulose have attracted widespread attention. In this study, a polymeric imidazolium satls (PIMS) functionalized cellulose foam (CF@PIMS) was conveniently fabricated. It was then employed to efficiently remove ciprofloxacin (CIP). Three imidazolium salts containing phenyl groups that can lead to multiple interactions with CIP were elaborately designed and then screened through a combination of molecular simulation and removal experiments to acquire the most significant binding ability of CF@PIMS. Besides, the CF@PIMS retained the well-defined 3D network structure as well as high porosity (90.3 %) and total intrusion volume (6.05 mL g −1 ) as the original cellulose foam (CF). Therefore, the adsorption capacity of CF@PIMS reached an astonishing value of 736.9 mg g −1 , nearly 10 times that of the CF. Furthermore, the pH-affected and ionic strength-affected adsorption experiments confirmed that the non-electrostatic interaction took on a critical significance in the adsorption. The reusability experiments showed that the recovery efficiency of CF@PIMS was higher than 75 % after 10 adsorption cycles. Thus, a high-potential method was proposed in terms of the design and preparation of functionalized bio-adsorbent to remove waste matters from samples of the environment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Petroleum Science
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2022
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IF 4.757
Fan Ding,Tao Shen,Shan-Shan Mao,Xin Jin,Mang-Lai Gao
For further understanding the wettability alteration induced by organic salts, series of bis -imidazolium salts (EBMI, TBMI, HBMI, OBMI and DBMI) were employed for investigating their adsorption behavior and wettability alteration on vermiculite (Vt) by experimental and theoretical studies. The characterization results indicated that all bis -imidazolium salts had been loaded on Vts. The adsorption results showed that EBMI, TBMI, HBMI, OBMI and DBMI on Vt reached equilibrium of 0.159, 0.156, 0.145, 0.114 and 0.084 mmol g −1 around 30 min at 25 °C, respectively, which were sensitive to ionic strength and pH. Langmuir, statistical physical modelling and pseudo-second-order models could be well fitted with the adsorption data, and thermodynamic parameters suggested that the adsorption processes of bis -imidazolium salts were endothermic and spontaneous, indicating that the resultant bis -imidazolium salts could be self-assembled onto Vt in the form of the monolayer. Results of molecular dynamic simulation showed that bis -imidazolium salts were adsorbed on Vt with the lying-flat configuration, and the electrostatic interaction acted as the main interaction mechanism, which were consistent with that obtained experimentally. Changes of wettability of Vt induced by bis -imidazolium salts were verified by capillary rise experiments. Interestingly, the wettability of organo-Vts varied with the spacer length and the order was as follows: EBMI-Vt < TBMI-Vt < HBMI-Vt < OBMI-Vt < DBMI-Vt, which could be explained by their arrangements, hydrophobicity as well as the interaction energies. The longer the spacers of bis -imidazolium salts, the greater the absolute values of the interaction energy, the less the adsorbed bis -imidazolium salts, while the more hydrophobic of organo-Vt. This work aimed at revealing the adsorption behavior, mechanism as well as effect of bis -imidazolium salts on wettability alteration of negatively charged mineral surface, providing some information for the selection of flooding agent for enhanced oil recovery and wettability modifier.
研究领域:
化学
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材料科学
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石油工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Chenlu Chen,Yue Xu,Zhiruo Li,Yinxin Yang,Yuxu Tao,Xiaoxuan Wang,Yini Wang,Haikuan Yuan,Lijuan Zhang,Xijian Liu,Jie Lu
In this article, the molar fraction solubility of (R,S)- and (S)-tetramisole hydrochloride in two binary solvents (methanol + ethanol and methanol + toluene) was measured by experiments between 283.15 K and 323.15 K. Then four different equations including Apelblat equation, λh equation, GSM equation, Jouyban-Acree equation were applied to connect the measured solubility data of (R,S)- and (S)-tetramisole hydrochloride, where Apelblat equation had the minimum ARD %. The crystal structures together with intermolecular interactions of (R,S)- and (S)-tetramisole hydrochloride were then analyzed. In addition, the infrared spectra were also simulated using dimer configurations. Furthermore, molecular dynamic simulations including radial distribution function (RDF) combined with solvation free energy were performed to explore solvent–solvent interactions along with solute–solvent interactions. The results showed that there was co-solvency in methanol + toluene binary solvent. According to simulation results, both solvent–solvent interactions and solute–solvent interactions played an important role in affecting the solubilities of (R,S)- and (S)-tetramisole hydrochloride. In the end, combining solid state characterization and ternary phase diagrams, (R,S)-tetramisole hydrochloride was determined to be a racemic compound. All the results in this paper can provide theoretical support for enhancing crystallization resolution techniques for chiral drugs.
研究领域:
药物化学
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物理化学
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产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Jingsheng Wang,Jun Wang,Shuang Yang,Guoping Ding,Renxin Xu,Wei Liu,Jiuxiao Sun,Kaiwen Chen,Liu Duan,Jiaqi Wang,Hao Wang,Siqi Huo
Single-component epoxy resin (EP) is the premix of EP and latent curing agent, which is highly demanded in industries. However, current single-component EPs struggle to balance storage stability with mechanical properties and flame retardancy. To address this issue, three phosphorus-derived imidazolium salts (MPOx, x = 2, 3, 4) were synthesized using 2-ethyl-4-methylimidazole (EMI) and phosphorus-containing acids with different oxidation states (diphenylphosphinic acid, phenyl hydrogen phenylphosphonate, and diphenyl phosphate). The oxidation state of phosphorus significantly influenced thermal latency of MPOx, with higher oxidation states leading to improved latency. EP/MPO4 achieved the longest shelf life of 42 d at 25 °C. EP/MPO3 and EP/MPO4 exhibited enhanced tensile strength, modulus, and impact resistance compared to EP/EMI, but EP/MPO2 showed poor mechanical properties due to phase separation. All EP/MPOx achieved limiting oxygen index (LOI) exceeding 30 %, with EP/MPO3 showing the highest LOI of 34.0 % and significant reductions in heat release and smoke production. Flame-retardant mechanistic studies revealed a shift from gaseous-phase flame inhibition to condensed-phase promoting carbonization with increasing phosphorus oxidation state. Obviously, MPOx provides a tailored balance of latency, mechanical strength, and flame retardancy, making it a promising solution for advanced single-component EPs in aerospace, electronics, and optical applications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Juanjuan Feng,Min Sun,Jubai Li,Xia Liu,Shengxiang Jiang
Physical and chemical properties of ionic liquids (ILs) are significantly affected by types of their cations and anions. In this paper, a novel aromatically functional 1-vinyl-3-octylimidazolium 2-naphthalene-sulfonate salt was synthesized through metathesis reaction between 1-vinyl-3-octylimidazolium bromide and sodium 2-naphthalene-sulfonate, and polymerized onto the stainless steel wire in situ via surface radical chain-transfer reaction. Octanol/water distribution coefficient of the ionic liquid was studied and compared with that of 1-vinyl-3-octylimidazolium hexafluorophosphate. Partition coefficients of polycyclic aromatic hydrocarbons (PAHs) on these two polymeric ionic liquids-coated fibers indicated the enhanced hydrophobicity and aromaticity of the target IL. Analytical parameters exhibited high extraction efficiency of the novel fiber. Calibration ranges for several PAHs were from 0.02 to 200 μg L −1 . Limits of detection (LODs) were ranged from 0.005 to 0.01 μg L −1 . Application reliability of the proposed fiber was also investigated with some phthalate ester plasticizers. LODs were ranged from 0.02 to 0.05 μg L −1 . Hair spray and nail polish were used as real samples, and di-n-butyl phthalate and di-(2-ethyl-hexyl) phthalate were quantified with the established method.
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
You Shu,Zhi-Yong Yang,Wen-Kai Pan,De-Xuan Xiang,Jing-Gao Wu,Lai-Hao Gao,Xu Jiao,Hong He,Zai-Xing Zhang,Gui Chen
Carbon capture, utilization, and storage strategies have emerged as critical and practical solutions for mitigating excessive carbon emissions. This study introduced the synthesis of 1,3-disubstituted imidazolium salt-functionalized hypercrosslinked polymer (HCPs) through Friedel-Crafts alkylation reaction. By manipulating the substituent group structure of the imidazole salts, the materials with a hierarchical pore structure and a moderate specific surface area was obtained, reaching up to 492 m 2 ·g −1 . The catalytic efficacy of HCPs materials in converting CO 2 into cyclic carbonates was evaluated in the absence of metals, solvents, or additives. Among these, HCPs-1 demonstrated exceptional catalytic performance in CO 2 -epoxide cycloaddition reaction, achieving yields as high as 99 % under 1.0 MPa CO 2 at 100°C over 10 h. Additionally, epoxides bearing various substituent groups were converted into cyclic carbonates using HCPs-1. The recyclability tests indicated that HCPs-1 retained its catalytic activity with no significant degradation after 6 cycles. Furthermore, the results of density functional theory (DFT) calculations revealed that benzimidazolium salts enhance the activation of both CO 2 and epoxides through CO 2 -philic N atoms and strong H-bonding interactions, thereby facilitating the cycloaddition process. Consequently, this work introduces a novel approach to the design and synthesis of imidazolium-functionalized heterogeneous catalysts, integrating heteroatoms to enhance catalytic activity.
研究领域:
化学工程
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环境科学
·
催化材料
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产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
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2019
·
IF 2.251
Pengshuai Zhang,Jiao Sha,Yameng Wan,Chi Zhang,Tao Li,Baozeng Ren
The solubility of levamisole hydrochloride (LH) in binary {methanol (MT) + ethanol (EA), methanol (MT) + 2-propanol (IPA)} solvent mixtures from 283.15 K to 323.15 K and dimethyl sulfoxide (DMSO) + ethanol (EA) from 293.15 K to 333.15 K were obtained under the pressure of 0.1MPa by using a dynamic method. Moreover, the experimental solubility results of LH in this work were correlated well with five thermodynamic models namely “Yaws model, van’t Hoff model, Universal Quasi-Chemical (UNIQUAC) model, non-random two liquid (NRTL) model and general single (GSM) model”. The minimum RMSD and ARD are 0.0064 and 0.17 respectively and they are both calculated with the GSM model. Besides, the apparent thermodynamic properties of LH in the selected binary solvent mixtures were discussed. Analysis results showed that enthalpy-favored mechanism plays a major role in the dissolution process of LH.
研究领域:
药物化学
·
物理化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）