Journal of Materials Chemistry B
·
2013
·Vol. 2
·期 10
·1344-1353
·
IF 0
Dongsheng Tan,Zhen Li,Xuelin Yao,Chunlan Xiang,Hong Tan,Qiang Fu
To study the influence of fluorinated surfaces and biomimetic surfaces on the improvement of the blood compatibility of polymers, three monomers containing a fluorinated tail and/or phosphorylcholine groups were designed and synthesized, and were then introduced into polyurethanes based on 4,4′-diphenylmethane diisocyanate (MDI), poly(tetramethylene glycol) (PTMG) and 1,4-butanediol (BDO) via end-capping. The bulk and surface characterization of the polyurethanes was carried out by dynamic mechanical analysis (DMA), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopic analysis (XPS), atomic force microscope (AFM), and water contact angle measurements. The results indicate that the fluorocarbon chains can drive the phosphorylcholine groups to aggregate at the surface of polyurethane, and the two components show spontaneous arrangement to adapt to the environment when in contact with water. The preliminary evaluation of hemocompatibility was carried out via fibrinogen adsorption and platelet adhesion. The fluorocarbon chains and phosphorylcholine groups showed a synergistic effect on the improvement of hemocompatibility.
研究领域:
生物材料学
·
医学工程
✓ 已验证
DOI
PubMed
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Jiahang Liu,Jian He,Pan Wu,Chao Yang,Wei Jiang
The preparation of superhydrophobic metal surfaces by one-step immersion in fatty acid solutions is simple and convenient, but the effect of the fatty acid type has not been investigated. In this work, Cu meshes were soaked in ethanol solutions of fatty acids with different carbon chain lengths to obtain surfaces with different wettabilities , which varied from superhydrophilicity to superhydrophobicity. The results showed that the contact angle of the surfaces gradually increased from 2.7 ° for the sample prepared with formic acid to 151.8 ° for the sample prepared with myristic acid. The maximum apparent surface energy and solubility parameter were 82.33 mN/m and 65.79 J 1/2 /cm 3/2 for the C 1 -Cu surface, and the lowest were only 6.3 mN/m and 19.91 J 1/2 /cm 3/2 , respectively, for C 14 -Cu. A simulation confirmed that as the carbon chain length of the fatty acid increased, the solubility parameter decreased, and the hydrophobicity increased. One-step immersion enables facile, inexpensive one-step preparation of membrane surfaces with controllable superhydrophobicity for large-scale industrial applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 96
·93539-93545
·
IF 3.289
Ye Zhu,Hai-Bo Zhang,Lian-Jun Ding,Zheng Chen,Da-Ye Sun,Zhen-Hua Jiang
Perfluorocarbon groups or related compounds are usually used to modify polymer materials because of their low surface energy properties. In this paper, a novel perfluorocarbon-containing compound was synthesized and used as a capping agent for the preparation of perfluorocarbon chain terminated poly(ether sulfone). The regulation of the fluorine content was achieved by controlling the molecular weight. FTIR and 1H NMR spectra were used to confirm the existence of perfluorocarbon terminated groups in the polymer chains. In addition, the ratios of F/C were acquired by integral area calculation from the 1H NMR spectrum. XPS characterization showed that the surface migration phenomenon of fluorine became apparent along with the increase of the F/C ratio. Further testing found that the introduction of perfluorinated end groups into the PES chains had little influence on the polymers' mechanical and thermal performance, by contrast, their surface energy decreased efficiently from approximately 40 mJ m−2 to 16 mJ m−2 with the F/C ratio on the surface increased from 0 to 0.556, which could develop PES as a low surface energy material for industrial applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jun Gao,Yiming Liu,Ya Zhong,Qi You,Yi Lin,Sheng Cui,Xiaodong Shen
Since the lotus effect was reported by Barthlott and Neinhuis in 1997, superhydrophobic and superoleophobic materials have received much attention due to special rough morphology and great potential applications in self-cleaning, anti-fouling, corrosion-resistance, and other fields. However, the conventional preparation process of superamphiphobic materials is complicated, including pre- and post-treatments which are used to achieve micro-nano hierarchical structures and low surface energy. In this study, we used methyltrimethoxysilane (MTMS) and 1,1,2,2- tetrahydroperfluorodecyltrimethoxysilane (FAS-17) as precursors and successfully prepared superamphiphobic FAS-17/MTMS composite aerogel via facile sol-gel method. Three-dimensional networks and long fluorocarbon chains formed micro-nano hierarchical structures. As-prepared aerogels had water contact angle (WCA) of 153.68°, oil contact angle (OCA) of 156.28°, water sliding angle (WSA) of 3.32° and oil sliding angle (OSA) of 4.57°, suggesting excellent superamphiphobic performance. Besides external superamphiphobicity, the cross section of sample also exhibited great liquid-repellency with WCA of 160.43° and OCA of 153.43°. Moreover, although cracked into powders with particle size of 0.1 mm, aerogel sample still retained its liquid-repellency with WCA of 122.85° and OCA of 128.01°, respectively. After thermal treatment under 200 ℃ for 2 h, the aerogel sample had WCA of 152.45° and OCA of 135.67°, showing excellent thermal stability. Taking advantage of low thermal conductivity and superamphiphobic properties, superamphiphobic aerogel has potential for fabricating self-cleaning and thermal insulating materials .
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Junhui Liu,Guanghui Zhang,Xiao Jiang,Junhu Wang,Chunshan Song,Xinwen Guo
Iron-based catalysts have been widely used to synthesize value-added hydrocarbons through CO 2 hydrogenation. Fe carbide, Fe 5 C 2 , was proposed as the active phase responsible for C C coupling during the chain growth. However, the reaction mechanism over iron-based catalysts is still under debate due to the presence of multiple phases of Fe species. In this work, Fe 5 C 2 and K-modified Fe 5 C 2 were prepared and used to study the relationship between the Fe phase, catalytic performance and reaction pathways. CH 4 and CO selectivities of 46.1 C-mol% and 2.8 C-mol% were obtained on Fe 5 C 2 at a CO 2 conversion of 49.8 %, with the main hydrocarbon products being alkanes. With the addition of the promoter K, the C 2 -C 4 = selectivity increased to above 38.0 C-mol%, and the selectivity to C 5+ hydrocarbons increased to 23.9 C-mol% at a similar CO 2 conversion. CH 4 and C 2+ hydrocarbons formed through the CO 2 →CO→hydrocarbons (indirect) route over K-modified Fe 5 C 2 , whereas the direct hydrogenation route occurred on unmodified Fe 5 C 2 in addition to the indirect route of CO 2 to CO to hydrocarbons through Fischer-Tropsch synthesis (FTS) processes. This work offers insights in direct CO 2 hydrogenation over Fe 5 C 2 and Fe 3 O 4 -Fe 5 C 2 catalysts, which advances the understanding of the functions of active phases and reaction pathways of CO 2 hydrogenation over iron-based catalysts.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 9
·3911
·
IF 4.6
Saizhen Jin,Qing Shi,Leming Ou
This work investigated the hydrophobic flocculation of cassiterite using four alkyl hydroxamic acids with varying carbon chain lengths, i.e., hexyl hydroxamate (C6), octyl hydroxamate (C8), decyl hydroxamate (C10) and dodecyl hydroxamate (C12), as collectors. Microflotation tests were performed to investigate the flotation behaviour of cassiterite in the presence of the four alkyl hydroxamic acids. Focused beam reflectance measurement (FBRM) and a particle video microscope (PVM) were used to analyse and monitor the real-time evolution of the particle size distribution of cassiterite and the images of flocs during flocculation. The extended DLVO theory interaction energies between the cassiterite particles were calculated on the basis of the measured contact angle and the zeta potential of cassiterite to determine the aggregation and dispersion behaviour of the cassiterite particles. The microflotation test results suggested that the floatability of cassiterite improved with the increase in the carbon chain length of hydroxamates. FBRM, PVM images and extended DLVO theory calculation results indicated that when C6was used as the collector, the cassiterite particles could not form hydrophobic flocs because the total potential energy between them was repulsive. When C8, C10and C12were used as collectors, the energy barrier amongst particles decreased with increasing hydroxamate concentration. The lowest concentrations of C8, C10and C12that could cause the hydrophobic aggregation of cassiterite were approximately 1 × 10−3, 1 × 10−4and 2 × 10−5mol/L, respectively. The aggregation growth rate and apparent floc size increased with an increasing collector concentration. Hydroxamic acid with a longer carbon chain could induce the cassiterite particles to form larger flocs at a lower concentration in a shorter time.Keywords:fine cassiterite;alkyl hydroxamates;hydrophobic flocculation;carbon chain length
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 8
·2677-2687
·
IF 6.177
Yunlei An,Tiejun Lin,Fei Yu,Kun Gong,Xinxing Wang,Xinzhen Qi,Dong Lv,Yuhan Sun,Liangshu Zhong
The effects of various alkaline-earth metals (Mg, Ca and Ba) on CoMn nanocatalysts for the Fischer–Tropsch synthesis to olefins (FTO) were investigated. Methane formation and second hydrogenation of olefins were suppressed effectively by the addition of alkaline-earth metals, while the olefin formation was enhanced. In addition, alkaline-earth metals can promote the carbon chain propagation to form higher hydrocarbon products, especially for long-chain olefins. Structure characterization results suggested that alkaline-earth metals with higher surface basicity would benefit the carburization of CoMn to form more Co2C nanoprisms for olefin formation.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaoli Yang,Yalan Wang,Haoxi Ben,Jia Yang,Wei Jiang,Anders Holmen,Yanqiang Huang,De Chen
Fischer–Tropsch synthesis over CoMn oxides is a surface-catalyzed structure-sensitive reaction. Active site changes greatly alter product distribution. The dynamics and essence of the changes in Co species during the reaction have seldom been explored. Herein, multiple characterizations were applied to confirm that two types of active sites, i.e., Co and Co 2 C, coexist on CoMnO x under the reaction conditions. Apart from the direct participation of carbon species in the reaction, the steady-state isotopic transient kinetic analysis also suggested the mutual transformation of carbon species in Co 2 C. The ratio of the two paths altered with the temperature, thus leading to Co 2 C-rich and Co-rich surfaces at intermediate and high temperatures, respectively. Kinetic calculations and microkinetic modeling showed that Co 2 C-rich surfaces facilitated CO adsorption and suppressed hydrogen adsorption. This gave high carbon-chain growth activity. The Co-rich surfaces showed high vacancy and hydrogen coverages, lowering the CO activation and CH 4 formation energies.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yuyang Di,Yilei Lu,Xianliang Li,Zhihao Chen,Wenzhong Yang
In this paper, two imidazoline derivatives, N 1 -(2-aminoethyl)- N 2 -(2-((2-(2-heptyl-4,5-dihydro-1 H -imidazol-1-yl)ethyl)amino)ethyl)ethane-1,2-diamine (HEIM) and N 1 -(2-aminoethyl)- N 2 -(2-((2-(2-(perfluoroheptyl)-4,5-dihydro-1 H -imidazol-1-yl)ethyl)amino)ethyl)ethane-1,2-diamine (PFIM), have been used as corrosion inhibitors of carbon steels in 1 M HCl at elevated temperatures. Two inhibitors are confirmed by 1 H NMR, 13 C NMR, high-resolution mass spectra and FT-IR tools. Electrochemical and immersion tests indicate that the PFIM displays a stable protection performance at different temperatures, with an inhibition efficiency value around 95%. Moreover, scanning Electron Microscopy (SEM), energy dispersive X-ray (EDX) analysis, atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS) indicates that the PFIM inhibitor film shows high hydrophobicity and stability at 363 K. Theoretical calculations suggest that the adsorption of PFIM is mainly through the bonding of the F of fluorocarbon chain on the Fe surface. This study helps us further explore the inhibition mechanisms of fluorocarbon chain-based imidazoline derivatives at high temperatures.
研究领域:
材料科学
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电化学
·
表面科学
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产品关联
DOI
高影响因子
Biomaterials Science
·
2021
·Vol. 10
·期 4
·1008-1017
·
IF 6.843
Xuan Chao,Chu Zhang,Xiaodan Li,Hongqian Lv,Guixia Ling,Peng Zhang
The prevention of bacterial infection is becoming more and more important in clinical medicine. Ionic liquids (ILs) can change the structure in an almost infinite way to actively antagonize pathogenic microorganism strains. The current biological materials of skin dressings inevitably have the shortcomings of single drug delivery form and low drug loading, which limit the practical application of skin dressings. Therefore, it is particularly important to develop drug delivery forms that can meet different conditions. The addition of ILs into crosslinked microneedle (MN) patches is a novel design scheme of MNs. The broad-spectrum antibacterial properties of imidazolium salt ILs ensure that the wound skin is sterile after the use of MN patches on the skin to open channels for drug delivery. In this study, imidazole IL monomers with different carbon chain lengths and the corresponding IL-MN patches were designed and synthesized. By comparing the antibacterial properties of four imidazolium salt IL monomers with different carbon chain lengths and the corresponding ionic liquid microneedle patches, we found that the antibacterial properties of IL monomers and IL-MN patches increased with the increase of substituent carbon chain lengths. Imidazole IL monomers have excellent antibacterial properties, which may be caused by the electrostatic interaction between the cations in the IL monomers and the anions in the bacterial membrane and the hydrophilic and hydrophobic interactions between the IL monomers.
研究领域:
生物材料学
·
医学工程
·
药剂学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 5
·736-743
·
IF 5.582
Enjie He,Kai Tu,Jiannan Cheng,Huanjun Lu,Lifen Zhang,Zhenping Cheng,Xiulin Zhu
Main-chain liquid crystalline polymers seldom develop into a columnar phase, let alone mesophase transitions between the columnar phase and other phases as the temperature changes. Herein, we present a new series of main-chain liquid crystalline copolymers which consist of strictly alternating rod-like aryl ester core, alkyl chain and perfluoroalkyl segments synthesized by photoinduced step transfer-addition and radical-termination (START) polymerization. The mesophases can be adjusted by changing the length of alkyl chains or perfluoroalkyl segments, which have been fully investigated and simulated in terms of molecular arrangements of molecules. Importantly the resultant liquid crystalline copolymers can present rare reversible phase transitions from a hexagonal columnar phase to a rectangular columnar phase and finally to a smectic phase with temperature increasing.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Minxian Wu,Li Wang,Shiying Wang,Jie Wei,Wenchang Wang,Xiaohui Chen,Naotoshi Mitsuzaki,Zhidong Chen
Diamond-like carbon films can be electrodeposited from organic acids in aqueous solutions. Chlorinated carboxylic acids with different chain lengths, ie. chloroacetic acid , 3-chloropropionic acid, 4-chlorobutyric acid and 5-chlorovaleric acid, were used as the carbon sources in the electrolytes. It showed an interesting even-odd effect of carbon chain length on the surface morphology of the electrodeposited carbon films. The odd carbon-numbered chlorinated carboxylic acids lead to smooth carbon films whose morphologies were insensitive to the deposition parameters. On the contrary, the morphologies of the films obtained from the even carbon-numbered chlorinated carboxylic acids were island-like and dependent on the film thickness. Fourier transform infrared and Raman analysis indicated that the electrodeposited diamond-like carbon films were hydrogenated and contaminated by oxygen.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）