JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 8
·
IF 1.395
Caina Min,Qun Pu,Liu Yang,Hong Fan
A novel polysiloxane bearing dodecyl and epoxy side groups (DESO) was synthesized as an intermediate through hydrosilylation of polymethylhydrosiloxane with allyl glycidyl ether and 1-dodecene. Then, dodecyl/piperazine functional polysiloxane (DPSO) was prepared through the reaction of N -aminoethylpiperazine with DESO. The chemical structure of DPSO was characterized with FTIR and 1 H-NMR spectroscopy and its application performance on cotton fabrics was studied. DPSO with dodecyl side groups gifted the treated fabrics with good wettability and whiteness compared with piperazine functional polysiloxane, while with a slightly reduced softness as well as thickening handle. Film morphology, orientation, and performance on cotton substrates of DPSO were investigated by scanning electron microscope, atomic force microscopy, X-ray photoelectron microscope, and so on. Affected by the dodecyl side groups, DPSO formed relatively hydrophilic, macroscopically smooth but actually uneven films with many dodecyl side chain pillars on the treated substrate surfaces. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40186.
研究领域:
高分子化学
·
纺织化学与染整工程
·
材料表面科学
·
功能材料
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2018
·
IF 2.377
Yuqing Ma,Yuyang Zhang,Lin Kong,Jiaxiang Yang
Five quinoline derivatives containing different alkyl chains ( QLACn , n = 2, 4, 6, 8, 12) were synthesized to investigate the effect of alkyl chains on their photophysical properties. The fluorescent properties of the QLACn were affected by the alkyl chains, which indicated obvious blue-shifting trend and fluorescence emission are alkyl chains length-dependent by grinding-induced spectral shifts (Δλ MFC ). Longer alkyl-length revealed larger Δλ MFC . Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) measurements indicated that the transformation between microcrystalline and amorphous states upon external stimuli should be responsible for the observed reversible MFC behavior.
研究领域:
材料科学
·
光物理学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Zhilin Xi,Zhenya Feng,Ang Li
For the control of pulverized coal, we propose a dust suppressant by applying a blend of mixed polyethylene oxide (g-PEO) and sodium dodecyl sulfate ( SDS ). In our experimental study, the thermal characteristics, critical micelle concentration ( CMC ), wettability and adhesion of the dust suppressant are investigated. It was found that g-PEO had a low fusing temperature and its combustion temperature was close to that of coal, thus, the solution containing g-PEO applied coal dust control did not affect the use of the coal. Based on steady-state fluorescence using pyrene as a fluorescent label, quantitative analysis revealed that the CMC s of g-PEO and SDS were 1 and 20 g/L in g-PEO& SDS solution, respectively. The solution containing SDS had the best wettability, but it only had a short-term effect. The solution containing g-PEO showed negligible wetting ability to wet coal dust. The solution containing g-PEO& SDS had better wetting ability and adhesion. Scanning electron microscopy showed that the coal dust covered by g-PEO& SDS on its surface could form a thin layer of armor by holding the particles together after air-drying. It was concluded that the g-PEO& SDS solution containing g-PEO for 1 g/L and SDS for 20 g/L could suppress coal dust and maintain a long-term effect.
研究领域:
环境工程
·
矿业安全
·
颗粒物控制
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表面化学
·
燃烧科学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2018
·Vol. 39
·期 11
·1800048
·
IF 4.441
Shuang Pan,Mingjing Zhu,Luze He,Hongdong Zhang,Feng Qiu,Zhiqun Lin,Juan Peng
An intriguing morphological transition from poly(3-hexylthiophene) (P3HT) 1D nanofibers to 2D nanoribbons enabled by the addition of a series of alkylthiols is reported. First, P3HT 1D nanofibers are formed due to strong anisotropic π–π stacking between planar rigid backbones. Upon the addition of alkylthiols, P3HT nanofibers are transformed into nanoribbons associated with the crystallographic transition from edge-on orientation to flat-on orientation. The content of alkylthiols has a great influence on the P3HT morphology in the solution. The mechanism of such a morphological transformation is discussed based on the interaction between alkylthiols and P3HT chains. This work offers an effective strategy to tailor the crystal morphology and dimension of P3HT, which not only improves the understanding of P3HT crystallization but also may enable such discovery into conjugated polymer-based optoelectronic devices.
研究领域:
高分子化学
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材料科学
·
凝聚态物理
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纳米科技
·
有机电子学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·Vol. 36
·期 10
·1726-1732
·
IF 1.964
Huanhui Chen,Xiaoci Li,Guoqing Zhao,Hongbo Gu,Zhirong Zhu
The side-chain alkylation of toluene represents a novel, environmentally friendly, and low cost route for the production of styrene . However, the yield of styrene produced in this way is currently low, and the mechanism responsible for the side-chain alkylation of toluene is poorly understood. Furthermore, the reason for the higher catalytic efficiency of CsX over NaX and KX remains unclear. In this work, the free radical mechanism of the side-chain alkylation of toluene over basic zeolite X has been elucidated using quantum chemical calculations , together with isotope tracing experiments and the reaction between p -nitrotoluene and methanol. The adsorption isotherm of methanol showed that Cs + ions could block methanol from accessing the β-cage, which is where the side-chain alkylation reaction occurred. Furthermore, the H–D exchange results between toluene and deuterated toluene (C 6 D 5 CD 3 ) showed that CsX was more efficient as a catalyst than KX for the conversion of toluene to the corresponding benzyl radical (C 6 H 5 CH 2 • ). These two results therefore explain the higher catalytic activity of CsX towards side-chain alkylation than KX. Based on the free radical mechanism, the selectivity of styrene could be increased from 17.4% to 59.4% using CO 2 as carrier gas instead of N 2 .
研究领域:
物理化学
·
催化化学
·
材料化学
·
反应机理
·
理论化学
·
能源化学
·
环境化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2011
·Vol. 29
·期 9
·1906-1910
·
IF 0.773
Lin Yan,Wenguo Yang,Lixin Li,Yang Shen,Zhiyong Jiang
A mild and facile Wittig reaction between N -substituted maleimides and aldehydes has been developed. Various synthetically valuable alkylidenesuccinimides were obtained from this one-pot reaction in high yields (up to 99%). The product was obtained by simple filtration and no extra purification was necessary. Ethanol, an environment-benign solvent, was found to be a suitable reaction medium.
研究领域:
有机化学
·
药物化学
·
绿色化学
·
合成方法学
·
medicinal chemistry
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 6
·5842-5847
·
IF 2.986
Lirong Yang,Chunmei Wang,Zhigang Liu,Xiaoyu Liu,Yang Song,Xiaoxin Feng,Baoqiang Zhang
Anatase TiO 2 coatings prepared by solvothermal process in a neutral ethanol solution of isopropyl titanate at 160 °C have been grown on slag wool fibers (SWF) which were modified by hexadecyltrimethylammonium bromide (CTAB) in advance. X-ray diffraction patterns confirmed the coatings are of a nanocrystalline anatase structure, and scanning electron microscopy observations and energy-dispersive X-ray spectrum revealed a continuous coverage of TiO 2 formed on the fiber surfaces. The photocatalytic activity of the samples was tested by the photocatalytic degradation of methylene blue (MB) solution. The results show that CTAB modified slag wool fibers (CMSWF) are not a suitable adsorbent for MB due to their weaker negative surface charges. Anatase TiO 2 coated CMSWF display higher photocatalyst activity than anatase TiO 2 coated SWF without CTAB modification, and Anatase TiO 2 coated CMSWF are relatively stable under UV-light irradiation.
研究领域:
材料科学
·
环境功能材料
·
表面改性
·
光催化
·
纳米涂层
✓ 已验证
DOI
高影响因子
TRIBOLOGY LETTERS
·
2019
·Vol. 67
·期 2
·58
·
IF 2.235
Jin Yongliang,Duan Haitao,Cheng Bingxue,Wei Lei,Tu Jiesong,Liu Jianfang,Li Jian
In this study, a multi-phenol antioxidant 2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenylthio)-1,3,5-triazine (THA) was synthesized. The thermal stability of THA and its oxidation resistance in triisodecyl trimellitate (TDTM) ester oil were evaluated compared with several commercial phenol antioxidants. Further investigations on the oxidation resistance and tribological performance of THA with dinonyl diphenylamine (Am) and ZDDP composites were conducted to determine the additive compatibility in TDTM. The results indicate that the THA possesses higher thermal stability and more effectiveness of oxidation resistance than the commercial phenol antioxidants. The synergistic anti-oxidative effect is confirmed for the THA/Am mixtures in TDTM ester oil. However, the addition of THA alone or THA/Am mixtures shows no improvement for the tribological performance of TDTM. Excitingly, the THA/Am/ZDDP composite additives not only have the superior oxidation resistance, but exhibit the effective friction and wear reductions. It suggests the excellent compatibility of the synthesized THA antioxidant with Am and ZDDP additives in TDTM ester oil.
研究领域:
材料化学
·
润滑材料
·
应用化学
·
高分子化学
·
表面科学
·
机械工程
·
石油化学
·
摩擦学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Bo Lin,Jian Chen,Zeng-Tian Li,Fu-An He,De-Hao Li
In this work, the fluoroalkylsilane-modified SiO 2 nanoparticles (NPs) were immobilized on the polyurethane sponges by a highly efficient drop-coating method using different polymers including poly(vinylidene fluoride), poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene), polystyrene , and polyurethane as the adhesives to achieve the superhydrophobic modification of the polyurethane sponges for oil-water separation. The successful fluoroalkylsilane modification for the SiO 2 NPs was confirmed by TEM, SEM , FITR, XPS, and TGA. Furthermore, the surface-modified polyurethane sponges were investigated by SEM and two-dimensional EDS mapping. The contact angles of the surface-modified polyurethane sponges were in the range of 151.6°–154.3°, which confirmed the realization of the superhydrophobic modification for the polyurethane sponges. The demonstration experiments showed that the resulting surface-modified polyurethane sponge could effectively remove oil from the oil-water mixture by direct absorption or gravity-driven filtration. Moreover, the surface-modified polyurethane sponges possessed not only high absorption capability for different oils including peanut oil, pump oil, and silicone oil but also good reusability . We believe that such novel surface-modified polyurethane sponges might be potential candidates for the oil-water separation.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
表面化学
·
分离科学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Zhilin Xi,Shuhui Zhou,Longzhe Jin
In this work, a self-hardening foam-sol (SHF) is proposed to control the diffusion of static coal dust. The SHF was mainly synthesized by a foaming solution (composed of 1 g/L polyethylene oxide (PEO), 25 g/L sodium dodecyl sulfate (SDS), 100 g/L sodium silicate and 874 g/L water) and organic acid with a concentration range of 10 to 13 g/L. Based on fluorescence spectrophotometry , drop shape analysis, X-ray photoelectron spectroscopy and scanning electron microscopy, several conclusions could be found. The critical micelle concentration of SDS was 25 g/L, when most of the pyrene pendants were solubilized into the SDS micelles to form the hydrophobic mixed micelles, and excimer formation began to reach a maximum. The SHF had optimal wetting ability with the smallest contact angle of 17 o , due to PEO-bonded water and SDS forming hydrogen and a dual adsorption layer, which could enhance the wetting ability of the SHF on coal dust surfaces. The SHF had the best accepted loss of liquidity time (180–86 s) and self-hardening time (236–121 s) via the reaction of sodium silicate and organic acid. The pores and cracks among dust particles could be linked closely by SHF via the solid bridge force. The primary components were silica and sodium carbonate with crystal water and hydrophilic C O and C O or O–C–O functional groups. Based on the dust suppression experiment, the dust suppression efficiency was almost 100% at airflow speeds below 12 m/s. Obviously, the dust particles could be controlled via their surfaces being covered by a layer of SHF, since the SHF has strong hydrophilic properties and the solid bridge force. In addition, vehicle-mounted SHF preparation equipment was designed.
研究领域:
环境工程
·
矿业安全
·
胶体与界面化学
·
职业健康
·
颗粒物控制
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 36
·16907-16918
·
IF 6.97
Hong Lin,Jian Mao,Minchao Qin,Zhilong Song,Wanjian Yin,Xinhui Lu,Wallace C. H. Choy
While red is one of the primary colors for display applications, the investigation of visible red emitting perovskites, particularly 2D perovskites, is relatively limited. In this work, we demonstrate a single-phase Ruddlesden–Popper quasi-2D (C3H7NH3)2CsPb2I7 perovskite for red color LEDs. Through increasing the annealing temperature of (C3H7NH3)2CsPb2I7 perovskite thin films, we have successfully achieved tunable emission wavelengths from 654 to 691 nm. Equally important, for all the quasi-2D perovskite LEDs, once the annealing temperature is fixed, the emission spectrum is independent of bias voltages, which is very important for their use in lighting and displays. With the analysis of the crystallinity, morphology, and thermodynamic stability of the quasi-2D perovskite, we find that the obtained (C3H7NH3)2CsPb2I7 perovskite is a single-phase quasi-2D perovskite with only n = 2 phase. Besides, we found that the red shifting of emission wavelength is caused by the increase of perovskite crystal size while increasing the annealing temperature. Our results also show that the temperature-induced color tunability can be applied to a series of quasi-2D perovskites with different alkylammonium cations. Importantly, we find that short alkylammonium spacers offer better electrical properties for efficient current transport and high performance in LED applications. This work contributes to controlling the optoelectronic properties of quasi-2D perovskites via controlling their crystal growth as well as paves the way to realize practical lighting and display applications of perovskite LEDs.
研究领域:
材料科学
·
光电功能材料
·
半导体器件
·
纳米结构材料
·
固态照明
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Kelei Zhuo,Yujing Wei,Jingjing Ma,Yujuan Chen,Guangyue Bai
Several alkylmethylimidazolium tetraphenylborates (C n mim-TPB, n = 2–10) were synthesized and explored as ion exchangers in plasticized PVC membranes with very attractive sensing behaviors. And then a series of ion-selective electrodes (ISEs) were prepared and their potentiometric properties were investigated. The proposed electrodes exhibited Nernstian responses to alkylmethylimidazolium-based ionic liquid cations [C n mim] + . These electrodes were successfully applied in the determination of thermodynamic parameters of ionic liquids in aqueous solutions and in the detection of [C n mim] + in tap water and distilled water with satisfactory results. For the as-prepared ISEs, one special and important relationship was observed between the selectivity coefficients and the length of alkyl side chains of interfering cations [C n mim] + . The proper understanding of this relationship should facilitate the development of new method for the determination of ionic liquids using ISEs.
研究领域:
分析化学
·
电化学
·
环境监测
·
离子传感
·
药物分析
·
水处理
·
生物传感器
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）