TEXTILE RESEARCH JOURNAL
·
2023
·
IF 2.3
Yanqin Shen,Jinyu Qiao,Hailiang Wu,Yijun Yao
In this work, a series of alkylation starches (St-Cn) with different alkylation degrees was synthesized by introducing alkyl chains (the number of carbon atoms was 3, 8, and 12, respectively) onto starch. The influence of the substitution degree (DS) and length of the alkyl chains on the sizing properties of alkylation starches was studied. Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectra provided evidence for the linkage of alkyl chains onto the starch structure. Benefiting from the flexibility characteristic of the alkyl chain and the weakening hydrogen bonding to starch structure, St-C8 alkylation starch film with a DS of 0.114 exhibited a high elongation break of 4.64%, which is higher than that of the modified starches reported in most of the literature. Moreover, the alkyl chain could reduce the internal stress of the starch adhesive layer among fibers, which improved the adhesion of alkylation starch to cotton fibers. The St-C12 alkylation starch obtained by the longer alkyl chain weakened the adhesion among fibers due to the strong hydrophobic effect. This work provides a new idea to achieve starch plasticization.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2020
·
IF 2.908
Tianwen Fan,Rongxin Shi,Huaying Tang,Hongyu Guo,Fafu Yang
This paper reported not only the first fluorescein liquid crystals but also revealed the influence of peripheral alkyl chains on mesomorphic properties and photophysical properties. Novel fluorescein-triphenylene dimers 4a–4f with different alkyl chains were designed and synthesised in yields of 76–83%. Samples 4a, 4b, 4c and 4d with CH3 and C4H9 exhibited the columnar mesophase but samples 4e and 4f with C8H17 showed no mesophase. The longer alkyl chains on fluorescein units resulted in the lower phase transition temperature. The too long alkyl chain destroyed the liquid crystalline behaviour. Their fluorescence quantum yields were as high as 0.78–0.87 in CH2Cl2 solution and 0.11–0.17 in solid states. The longer alkyl chains leaded to the higher emission efficiencies.
研究领域:
材料化学
·
物理化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Guangzhi Xu,Mingzhen Shi,Hailong Ning,Leizhi Zheng,Zhuoheng Tu,Xiaomin Zhang,Xingbang Hu,Youting Wu
The separation of C 3 H 6 and C 3 H 8 has been a technical challenge owing to their similar physical and chemical properties. The currently used separation technologies still suffer from the low efficiency, high operating cost and volatility of media, which urges researchers to develop greener and more efficient media. To achieve this, a series of protic cuprous-based ionic liquids (PCILs) combining both cuprous site and long alkyl chain were designed in this work for the absorption separation of C 3 H 6 and C 3 H 8 . Surprisingly, the solubility of C 3 H 6 in [TOAH][CuCl 2 ] is as high as 0.238 mol/kg at 313 K and 1.0 bar, which exceeds most of results reported so far. The experimental data and thermodynamic analysis showed that extending alkyl chain of ILs promoted the dissolution of C 3 H 6 and C 3 H 8 , while the introduction of Cu(I) improved the selectivity of C 3 H 6 /C 3 H 8 . In addition, the interaction mechanism of C 3 H 6 and C 3 H 8 with ILs was further clarified by quantum chemical calculations and FT-IR spectroscopy. Furthermore, regeneration of [TOAH][CuCl 2 ] can be easily realized under depressurizing condition without heating and loss in separation performance, and [TOAH][CuCl 2 ] was found very stable to both moisture and oxygen for at least fifteen days. The strategy of combining long-chain alkyl and Cu(I) site in this work may provide an important guideline for enhancing C 3 H 6 /C 3 H 8 selectivity, but more efforts on enhancing Cu(I) activity still need to be made for improving C 3 H 6 /C 3 H 8 selectivity.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 22
·10021-10030
·
IF 3.591
Lan Chen,Chunying He,Dongmei Liu,Yi Zheng,Wanlu Li,Yanli Zu
Increasing the electron density on the phthalocyanine (Pc) ring is an effective approach for ensuring an excellent third-order nonlinear optical (NLO) property. Herein, a series of axially substituted indium Pcs (axial substituent: ethyl, n-propyl, n-butyl, n-pentyl) were synthesized on the basis of tetra-[3-(2-ethoxy)ethoxy] indium phthalocyanine chloride (InClPc). The third-order nonlinear optical properties were investigated by the Z-scan technique at 532 nm with 4 ns laser pulses. All the axially alkyl substituted InPcs showed a better nonlinear absorption response than InClPc. The NLO properties of the axially substituted Pcs got better with the increased length of the alkyl chain. The effect of alkyl chain substituents on the nonlinear absorption of indium phthalocyanine was demonstrated through their optical physical parameters (ΦF, kST, ΦT, and τT).
研究领域:
化学
·
光学材料科学
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产品关联
DOI
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2017
·
IF 0.571
Anna Ruan,Hongyu Guo,Chuang Yang,Fafu Yang
Series of cyclotriveratrylene (CTV) derivatives with triazole ring and three alkyl groups were prepared by one-pot click condensation in yield of 80–88%. The structures and crown conformations were confirmed by NMR and MS. Their liquid crystalline properties were investigated by DSC, POM and XRD analysis. The studies on mesomorphic properties suggested that the CTV derivatives with pentyl, hexyl or dodecyl groups show no mesophase but the one with octadecyl groups possesses ordered hexagonal columnar mesophase. In comparison with the reported columnar CTV liquid crystals with six alkyl chains at least, the CTV columnar CTV liquid crystal with three alkyl chains was reported for the first time. These results suggested a subtle balance between the number and length of alkyl chains for columnar CTV liquid crystalline behavior.
研究领域:
材料科学
·
化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Han Jia,Zhe Wang,Xinbo Geng,Rui Sun,Bowen Wang,Xu Li,Xiaolong Wen,Fangning Fan,Shijie Wen,Qiang Wang
Nowadays, the nanoparticles had attracted tremendous attention in enhanced oil recovery (EOR) due to their ultrasmall size, large specific surface area and unique quantum effect. In this research, the amphiphilic silicon quantum dots (SiQDs) were successfully modified by different alkyl chains through the facile process. The SiQDs were characterized by Fourier transform infrared spectrometer (FT-IR), dynamic light scattering (DLS), transmission electron microscopy (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD) and atomic force microscope (AFM). The water contact angle, interfacial tension (IFT) and expansion modulus were measured to evaluate interfacial properties. Compared with the hexyltrimethoxysilane and octyltrimethoxysilane, the propyltrimethoxysilane with short alkyl chain significantly improved the interfacial activity of the SiQDs@C3–0.3 % to reduce the IFT from 51.0 mN/m to 9.8 mN/m. It was found that both the alkyl chain length of the silane coupling agent and its dosage could significantly affect the amphiphilicity of the SiQDs. Moreover, the optical microscopy, the static multiple light scattering and the rheometer were employed to confirm the remarkable stability and the high viscosity of SiQDs@C3–0.3 % stabilized emulsion, which were attributed to the rigid interfacial film and the three-dimensional interparticle network generated by the SiQDs@C3–0.3 %. Finally, the core-flooding experiments suggested the SiQDs@C3–0.3 % stabilized emulsion enhanced oil recovery by 22.1 %.
研究领域:
材料科学
·
石油工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiang Feng,Mingyan Li,Junyi Yin,Tianyi Cui,Fuxiang Li,Yonghong Cheng,Shujiang Ding,Xin Xu,Jianhua Wang
Amino acids are considered effective additives for regulating the electric double layer (EDL) in zinc-ion battery (ZIB) electrolytes. In comparison to their polar counterparts, nonpolar amino acids have received less attention in research. We demonstrated that isoleucine (ILE), benefiting from its nonpolar alkyl chain, emerges as a highly suitable electrolyte additive for aqueous ZIBs. ILE molecules preferentially adsorb onto the anode surface of zinc metal, subsequently creating a locally hydrophobic EDL facilitated by the alkyl chain. On one hand, this enhances the thermodynamic stability at the anode, while on the other hand, it accelerates the desolvation process of zinc ions, thereby improving the kinetics. Benefiting from the unique properties of ILE molecules, Cu//Zn cells with the ILE additive ultimately achieved an extended cycle life of 2600 cycles with an average coulombic efficiency of 99.695%, significantly outperforming other amino acid additives reported in the literature.
研究领域:
材料科学
·
电化学
·
生物化学
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DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
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
·
材料科学
·
表面工程
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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
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DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 4
·877-885
·
IF 2.557
Dan Liu,Ting Qiao,Haiyan Liu,Xiaoling Wang,Zhi-guo Shi
In the present study, a polar-embedded reversed-phase liquid chromatographic stationary phase that contained internal sulfone groups was prepared. The synthesis involved the “thiol-ene” click chemistry between the vinyl functionalized silica and 1-octadecanethiol, followed by the oxidization of sulfide to sulfone groups. The resulting material simultaneously possessed the alkyl chain, i.e. C18, and the internal sulfone groups. Elemental analysis demonstrates that the element contents of the C18/sulfone silica were C 8.94%, H 1.87% and S 0.66%. Chromatographic evaluations indicate that the C18/sulfone stationary phase exhibited a little less retention than the C18/sulfide one. A comparable chromatographic performance of neutral analytes was obtained on these two columns, but much better chromatographic performance in the case of basic and acid analytes was obtained on C18/sulfone stationary phase with additional features such as lower silanol activity, better stability (stable working conditions of pH 1.0–10.0), and better compatibility with 100% aqueous mobile phases. The batch-to-batch reproducibility was acceptable (the RSDs of retention times for the probes were no higher than 1.73%), demonstrating the suitability of the applied synthetic strategy for the new stationary phase. The C18/sulfone is a promising polar-embedded RPLC stationary phase.
研究领域:
分析化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 7
·3750-3759
·
IF 2.936
Ming Li,Dong Liu,Bin Lou,Yadong Zhang,Shitao Yu,Jnuwei Ding
Naphthene-based aromatic-rich fraction was modified by tetrahydronaphthalene and polyethylene glycol to obtain modified materials which were selected to prepare mesophase pitches by a direct condensation method. The structural composition of modified materials were characterized by simulated distillation (SIMDIS), elemental analysis, Fourier transform infrared spectrometry (FTIR) and 1H nuclear magnetic resonance (1H NMR) spectroscopy. Influences of the naphthenic structures and alkyl chains in modified materials on the formation and development of mesophase structures were investigated by analyzing variations in optical texture, softening point, carbon residue, molecular and microcrystal structure of mesophase pitch. Results showed that the alkyl structures in modified materials treated by tetrahydronaphthalene and polyethylene glycol were mainly naphthenic structures and alkyl chains, respectively. The existence of alkyl structures in modified materials was beneficial for the formation of mesophase with high quality. Moreover, the naphthenic structures had a better improving effect than alkyl chains. Abundant naphthenic structures or an appropriate amount of alkyl chains in feedstock contributed to the preparation of mesophase pitch with large domain structure, low softening point, high carbon residue and ordered microcrystal structure.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）