AUSTRALIAN JOURNAL OF CHEMISTRY
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2013
·Vol. 66
·期 11
·1361-1369
·
IF 1.869
Yanyan Wang,Libin Liu,Congde Qiao,Tianduo Li
N-Alkyl-substituted polyurethanes with different alkyl chain lengths were prepared from the corresponding bromoalkane (1-bromooctane, 1-bromotetradecane, and 1-bromooctadecane) and polyurethane consisting of poly(propylene glycol) (PPG), 4,4′-diphenylmethane diisocyanate, and 1,4-butanediol. The synthesised materials were characterised by 1H NMR and FTIR spectroscopy and the degrees of substitution were discussed by changing the reaction conditions. Differential scanning calorimetry and X-ray diffraction were used to characterise the thermal properties and crystalline state. Microphase-separated nanostructures, with hard segments (nanofibre-like) embedded into amorphous PPG soft segments, are observed by atomic force microscopy and scanning electron microscopy. A reversible behaviour of the films was revealed by contact angle measurement. Stimuli-responsive films were realised by solvent vapour annealing and heat treatment, and exhibited a reversible switching in surface wettability with a remarkable change in the water contact angle of 21°.
研究领域:
高分子化学
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材料科学
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表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Kun Fan,Jingdong Peng,Huanjun Peng,Zilong Zhang,Jun Chen,Pan Luo,Xiang Wang
The properties of ionic liquids (ILs) greatly influenced the retention of solutes on IL-functionalized stationary phases. In this work, three IL-functionalized stationary phases (Sil-C4Im, Sil-C7Im, and Sil-C10Im) were prepared by modifying silica gel with three ionic liquid silane reagents differing in spacer alkyl chain lengths, which refers to the alkyl chain between the imidazolium and the sulfur atom. The preparation was proved through a range of characterization techniques, including elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA). The effects of chromatographic conditions, such as acetonitrile content, salt concentration, pH, and column temperature, were studied to explore the retention mechanism of three stationary phases, which indicates that three IL-stationary phases provide interactions with solutes in reverse-phase liquid chromatography (RPLC), hydrophilic interaction liquid chromatography (HILIC), and ion exchange chromatography (IEC). The column efficiency is 83,686 plates/m for aminobenzoic acid , and the column also has excellent repeatability of retention time with relative standard deviations (RSDs) between 0.24% and 0.34% ( n = 12). A variety of analytes, including five nucleosides and nucleobases, six alkylbenzenes, two polycyclic aromatic hydrocarbons (PAHs), and four inorganic anions, were separated well on three IL-functionalized stationary phases. It was found that the spacer alkyl chain length influenced selectivity by comparing the retention of the three IL-functionalized stationary phases.
研究领域:
分析化学
·
色谱学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Nan Zhou,Hua Yan,Peibai Wei,Hongyu Guo,Fafu Yang
Although some AIE-based CPL materials had been presented, the design and synthesis novel AIE-based CPL materials and studies on the relationship of structure–property were still a challenging work. Herein, series of novel 1,4-bis(β-cyanostyryl)benzene derivatives 2a , 2b and 2c bearing chiral alkyl chains were prepared, and the influence of length of alkyl chains on CPL properties were investigated for the first time. Samples 2a , 2b and 2c were synthesized by simple procedure with 83–88 % yields. Samples 2b and 2c with longer chains displayed the typical liquid crystalline properties. All of them showed strong fluorescence in both solution and aggregated states. Their chiroptical properties of CD and CPL signals were influenced strongly by the molecular stacking in various states. The self-assembly in mesophase resulted in the best chiroptical properties. The longer alkyl chains contributed to stronger CD and CPL signals. The highest g lum value attained 1.6 × 10 -2 for sample 2c based on the effective chirality transfer and amplification of liquid-crystalline mesophase.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2017
·
IF 2.661
Xi-Dan Han,Xian-Li Tian,Wen-Hao Yu,Shi-Kai Xiang,Ping Hu,Bi-Qin Wang,Ke-Qing Zhao,Xiao-Zhen Chen,Chun Feng
A comparative study of our established synthetic approaches to hexasubsituted triphenylenes 2,3-dicarboxylic esters containing four identical β-alkoxy and two adjacent β-alkoxycarbonyl side chains shows that the phase behaviours of small-sized discotic liquid crystals can be tailored over a wide range by simply varying the length of the peripheral alkyl chains. All the prepared esters in two series were observed to form a single hexagonal columnar phase, except for Tp4-1 having four β-butyloxy and two adjacent β-methoxycarbonyl chains which displays two columnar mesophase behaviours with a transition from the columnar plastic phase to hexagonal columnar phase. A significant difference between the two mesophase was observed in the variable temperature X-ray diffraction studies, and the mesophase assignment was also confirmed by polarising optical microscopy and differential scanning calorimetry. Moreover, the prepared esters in each series display the general trend of decreasing clearing temperature upon increasing alkoxy or alkoxycarbonyl chains length. The intermediate triphenylene 2,3-dicarboxylic acids were also found not only to exhibit columnar hexagonal mesophase over a narrower temperature range by maintaining high melting and clearing points but also to form organogel on mixing with toluene or dichloromethane with the assistance of hydrogen bonding.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Yumiao Lu,Weilu Ding,Kun Li,Yanlei Wang,Bobo Cao,Ruirui He,Hongyan He
Ionic liquids (ILs) are an emerging class of media of fundamental importance for chemical engineering, especially due to their interaction with solid surfaces. Here, we explore the growth phenomenon of surface-confined ILs and reveal a peculiar structural transition behavior from order to disorder above a threshold thickness. This behavior can be explained by the variation of interfacial forces with increasing distance from the solid surface. Direct structural observation of different ILs highlights the influence of the ionic structure on the growth process. Notably, the length of the alkyl chain in the cation is found to be a determining factor for the ordering trend. Also, the thermal stability of surface-confined ILs is investigated in depth by controlling annealing treatments. It is found that the ordered monolayer ILs exhibit high robustness against high temperatures. Our findings provide new perspectives on the properties of surface-confined ILs and open up potential avenues for manipulating the structures of nanometer-thick IL films for various applications.
研究领域:
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jiahai Jia,Jiazhi Han,Mingjie Chen,Qing-Shan Shi,Xiaobao Xie,Yanzhu Guo
Aminoalkyl cellulose derivatives are bioactive polymers that have demonstrated important application as nanomicelles in biomedicines. However, the self-assembly behavior of aminoalkyl cellulose into nano micelles remains unclear. In this study, aminoalkyl cellulose with different degree of substitution (0.12–0.81) and varying alkyl chain lengths (C2-C6) were synthesized using tosylcellulose as an intermediate. The as-prepared aminoalkyl cellulose self-assembled into nanomicelles with particle size ranging from 121 nm to 185 nm, and ζ potential from 37.5 mV to 30.1 mV. Both the particle size and ζ-potential of the aminoalkyl cellulose micelles can be regulated by the degree of substitution, chain length of aminoalkyl groups, solution pH, ion strength, addition of fatty acids, and storage time. These findings shed light on the preparation of nanomicelles from amino cellulose derivatives, which hold important applications as biological materials.
研究领域:
生物材料学
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纳米医学
·
药物递送系统
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高分子化学
·
生物物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Wei Chen,Ying Wei,Xinyi Ge,Shuangqing Li,Xinyuan Zhang,Zhong-Xia Wang,Zheng Xing,Qingguo Zhang,Xiang Liu
Ionic gels as novel conductive components for flexible electronics are key to developing and improving the performance of next-generation electronic devices. Herein, for the first time, the structure-activity relationship of ionic gels based on poly(vinylidene fluoride-hexafluoropropylene) embedded with different alkyl chain lengths of imidazole ionic liquids is reported in detail. Surface morphology, internal structure, mechanical properties, electrochemical properties, and simulations are used to investigate alkyl chain effects on ionic gels. The results show that ionic gels with shorter alkyl chain lengths of imidazole cation have the highest electrochemical performance and porosity, among which the ionic gels based on 1-ethyl-3-methylimidazole tetrafluoroborate ionic liquid have the highest ionic conductivity (5.27 × 10 −3 S cm −1 ), and the assembled flexible capacitors have better specific capacitance with 261 F g −1 and energy density with 36.25 Wh kg −1 . On the contrary, the longer the chain, the better the mechanical properties: the ionic gels prepared with 1-decyl-3-methylimidazole tetrafluoroborate ionic liquid have the best ductility (77.4% deformation) and potential application value in human sensing and monitoring. This work provides a viable idea for the design, development, and application of ionic gels as flexible electronics.
研究领域:
材料科学
·
电化学
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柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Haoxin Li,Yanxi Wang,Wan Aida Wan Mustapha,Xiaoping Zhang,Fankui Zeng,Jia Liu
A fish scale (FS) gelatin-fatty acid conjugate (GFC) with alkyl chain lengths of 8–18 was constructed to increase the aqueous solubility of curcumin. The effect of alkyl chain length on the interaction between GFC and curcumin was characterized by dynamic light scattering (DLS), X -ray photoelectron spectroscopy (XPS), fluorescence spectroscopy (FS), and isothermal titration calorimetry (ITC). The surface hydrophobicity (from 4987 ± 223.79 to 9982 ± 262.78) and curcumin loading capacity (from 8.20 ± 0.54 to 31.18 ± 1.41 μg/mg) of the GFC exhibited significant enhancements through increasing alkyl chain lengths from 8 to 18. This was accompanied by a reduction in particle size (from 661.5 ± 28.9 to 329.7 ± 6.6 nm) and ζ -potential (from −2.7 ± 0.92 to −26.8 ± 0.27). FS and ITC confirmed that GOC shared an optimal binding constant ( K a , 2.40 × 10 8 L·mol −1 and 3.47 × 10 5 M −1 ) and binding site ( n , 1.45 and 2.276) with curcumin among GFCs. Increasing GFC's alkyl chain length also boosted the stability of entrapped curcumin against the thermal environment and ultraviolet radiation. These results could be beneficial for gelatin-based nanocarrier development and application.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Yong Zheng,Jiahuan Luo,Ling Li,Qian Wang,Huichao Lv,Kai Wang,Changwei Lai
In this study, six pure 1-alkyl-2-methylpyrazolium-based ionic liquids (ILs) with methyl sulfate and bis(trifluoromethylsulfonyl)imide anions ([Cnmpz][MeSO4] and [Cnmpz][NTf2], n = 2, 3, and 4) were prepared and characterized. The density, viscosity, and refractive index of these pure ILs were measured from 298.15 to 353.15 K at 101.3 kPa, which fitted well with the corresponding empirical equations. Moreover, the values of the isobaric thermal expansion coefficient were also obtained. The results of experiments and density functional theory calculations indicate that the adjacent positions of two nitrogen atoms in pyrazolium cations lead to the close packing of ions, strong cation–anion interaction, and high molar polarizability per unit volume. The effects of temperature and N-alkyl chain length on the density, viscosity, and refractive index of these ILs are similar to those for imidazolium-based salts. Compared with [Cnmpz][MeSO4], [Cnmpz][NTf2] exhibits a higher density, lower viscosity, and lower refractive index under the same conditions. Moreover, the correlation between density and refractive index was studied, and a new empirical equation was proposed to express this correlation at different temperatures. It is expected that this work will enable deeper insights into the properties, structure, and structure–property relationship of pure pyrazolium-based ILs.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Smart Materials and Structures
·
2022
·Vol. 31
·期 2
·025030
·
IF 4.131
Hanqi Xu,Jinbo Wu,Yaying Hong,Weijia Wen
We demonstrate the impact of diester structure, in particular the alkyl chain length and branching structure, on the giant electrorheological (GER) effect and suspension stability. The existence of oil–particles interaction is of critical importance to induce the GER effect. To quantify GER performance and colloidal stability, we examine the yield stress, current density, field-off viscosity and sedimentation ratio with respect to the variation of chain length and branching structure. The oil–particles interaction is quantitatively analyzed by investigating the cluster size of particles in different diesters by a multiple light scattering analyzer, along with the wettability of different chain lengths of diesters and solid particles by the Washburn method. Our results indicate that long chain lengths favor the formation of particle agglomerates, thereby enhancing the GER effect (such as high yield stress). The attachment of branches on diester causes the formation of electronic correlation between branches and main chain, depending on the position of branches located, and hence results in superior GER performance and favorable suspension stability. An optimal GER fluid constituted by bis(2-ethylhexyl) sebacate is acquired with the achieved yield stress of 113 kPa at electric field strength of 4 kV mm−1 and the prominent integrated GER properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Zihao Feng,Jinshuai Liu,Manru Liu,Juan Wang,Xiuhua Li,Yigang Yu
We successfully prepared a series of highly ionized anion exchange membranes (AEMs) with the equivalent modifications of the linear aliphatic di-cation appending different flexible and hydrophobic alkyl tails (named QPT-Cn, n is the number of carbon atoms in the tails). Due to the synergistic interaction between the domain-limiting of the intermediate unit ethyl group of the di-cation and the hydrophobicity of the tails, QPT-Cn membranes are endowed with different microphase separation structures and exhibit various mechanical and electrochemical properties. The well complement of the C12 tails and the dense di-cations offer QPT-C12 the well-tuned microphase structure, manifesting better mechanical and electrochemical properties at the wet state. Owing to the greatly improve electrochemical properties, QPT-C12 shows the comprehensive ED performances significantly better than those of commercial AMX with an increase of 7.97 % in current efficiency (η), a reduction of 21.70 % in energy consumption, and η remaining rates of more than 98.76 %. The above results confirm that the complementary enhancement strategy of combining appropriately sized hydrophobic alkyl tails with dense linear aliphatic di-cation is an effective method to develop the advanced ED AEMs. The excellent ED performances of QPT-C12 are of competitive in the ED desalination applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Qian Zhang,Xiuhong Wang,Xilian Wei,Jie Liu
The detailed micellization behavior of 3-alkyloxy-2-hydroxypropyl trimethylammonium chloride (RnHTACl, n = 12, 14, 16) in aqueous solution was studied by electric conductivity, steady-state fluorescence, and isothermal titration microcalorimetry (ITC) methods. The critical micelle concentration (CMC) and degree of counterion dissociation (α0) were estimated from conductivity curves in the temperature range of 293.15 K to 323.15 K. Then the thermodynamic parameters of micellization (ΔGm0, ΔHm0, and ΔSm0) were calculated by applying a mass-action model equation. On the basis of the ITC results, the CMCs and thermodynamic parameters were also estimated at 293.15 K, which were basically consistent with the results from the conductivity method. According to the Turro–Yekta method, the micelle aggregation number (Nagg) of RnHTACl was determined through static luminescence quenching, and found that the decreased temperature, the elongation of the alkyl chain length or the increased concentration of RnHTACl could lead to an increase of the Nagg.
研究领域:
物理化学
·
胶体与界面科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）