CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Cheng Zhang,Runping Li,Jianhua Liu,Guo Chen,Shenghui Guo,Lei Xu,Shijie Xiao,Zhigang Shen
The effects of modification temperature and time on polyacrylonitrile (PAN) fibers under various concentrations of KMnO 4 were studied. Wettability , colouration, chemical structure (Fourier transform infrared spectroscopy), crystal structure (X-ray diffraction), stack domains (D), interlayer spacing (d), microscopic structure (Scanning electron microscopy) and elemental content (energy dispersive spectroscopy) were analysed. Aside from its good hydrophilicity, KMnO 4 at 2 and 4 wt% are beneficial to the modification of PAN fibers. The colouration of the fiber at 80 °C is the most obvious. The clear peak of the pre-oxidised fibers at 2340 cm −1 corresponds to the conjugated structure of MnO 4 –C N. At 4 wt%, the degree of pre-oxidation is too high and the main infrared peak disappears. M 2, 30 has a minimum D of 9.320 nm and 8.258 nm at 2θ = 16.883° and 2θ = 29.673°, respectively, and the fiber crystals are the finest. At a content of 4 wt%, the fibers are axially cracked and crystals appear on the surface. M 2, 30 and M 2, 60 have a close percentage of C element, whereas M 2, 30 has a lower percentage of Mn element. The best modification conditions of KMnO 4 are 2 wt%, 80 °C and 30 min.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yaqun Han,Jingyuan Hu,Jie Ren,Shufen Zhang,Suli Wu
Introducing structured color-generating microstructures on leather instead of dyestuffs is expected to be an effective solution to achieve high-performance colorful leather without harmful effluent. Here, based on the disordered thin-layer Cu2O or ZnS microstructure, we obtained a series of colorful leathers with both sparkling brilliant structural colors and excellent color durability, using polyurethane and polyacrylate as linkers. The brilliant colors were generated by Mie resonance of ZnS or Cu2O nanospheres, while the polymer binders provided color stability and unique high gloss. The brilliant color has a unique sparkling effect under light, and the structural color can be adjusted by the sizes of the Cu2O or ZnS spheres. The colorful leather has superior rubbing fastness (4–5 grades) and superior light fastness (5–6 grades) to maintain color stability. Additionally, multiple color patterns and large-area colorful leather can also be produced, displaying great potential in the sustainable development of the leather industry.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
·
2017
·
IF 0.736
Hongcheng Peng,Weihong Qi,Wenhai Ji,Siqi Li,Jieting He
Combining the bond-energy model and Debye theory, we generalized the Gibbs free energy model for Cu–Pt nanoparticles (NPs) by introducing a shape factor considering the shape effect. We studied the structural stability of the Cu–Pt NPs and plotted the corresponding composition-, shape- and size-dependent phase diagrams. It is shown that the Cu–Pt NPs can form alloyed structure in a large size range. But when the particle size continues to decrease, the NPs will form the core–shell structure due to surface segregation. Meanwhile, the composition segregation could make the atoms of less-content element to gather in the surface. The predictions from the present calculated phase diagrams are consistent with a series of experimental results in literatures. To further prove the efficiency of the phase diagrams, we synthesized the alloyed Cu–Pt NPs of 4–15 nm by a co-reduction method, which is in agreement with the predictions from the phase diagrams.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-9
·
IF 3.125
Tan Xianhua,Shi Tielin,Lin Jianbin,Sun Bo,Tang Zirong,Liao Guanglan
We propose a novel one-step exposure method for fabricating three-dimensional (3D) suspended structures, utilizing the diffraction of mask patterns with small line width. An optical model of the exposure process is built, and the 3D light intensity distribution in the photoresist is calculated based on Fresnel-Kirchhoff diffraction formulation. Several 3D suspended photoresist structures have been achieved, such as beams, meshes, word patterns, and multilayer structures. After the pyrolysis of SU-8 structures, suspended and free-standing 3D carbon structures are further obtained, which show great potential in the application of transparent electrode, semitransparent solar cells, and energy storage devices.
研究领域:
材料科学
·
光学工程
·
微纳制造
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Wei Fan,Yu Bai,Yanfen Liu,Taotao Li,Binmao Li,Lei Zhang,Chenmin Gao,Shiyu Shan,Haocen Han
Dual-phase rare-earth-zirconate high-entropy ceramics have gained significant research interest recently. However, the large composition complexity and serious lattice distortion from multi-components doping increase the uncertainty of their crystal structures. In this work, a series of dual-phase rare-earth-zirconate medium- and high-entropy ceramics are successfully fabricated. Results of this study indicate that these dual-phase ceramics are composed of pyrochlore and fluorite structures. Simultaneously, a principal element design criterion of the pyrochlore-fluorite dual-phase medium- and high-entropy ceramics is proposed. The phase structures of pyrochlore-fluorite dual-phase samples are co-determined by the average ionic radius ratio and the size disorder parameter. When the average ionic radius ratio is in the range of 1.4 to 1.5 and the size disorder parameter is larger than 5%, it is more inclined to form pyrochlore-fluorite dual-phase structure. This work has an important guiding significance to the composition design of pyrochlore-fluorite dual-phase medium- and high-entropy ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2015
·
IF 4.457
Jinyan Gu,Xiaomei Wang,Lei Tian,Lei Feng,Jiayan Qu,Pange Liu,Xu Zhang
We present a facile strategy to prepare grape-like silica-based hierarchical porous interlocked microcapsules (HPIMs) by polystyrene colloidal crystals templates, whose structure is the subtle integration of open mouthed structure, hierarchical porous nanostructure and interlocked architecture. HPIMs are fabricated by replicating colloidal crystals templates that have a hexagonal close-packed structure; thus, theoretically, each microcapsule has 12 open mouths, and these open mouths with mesoporous microcapsule wall construct the hierarchical porous structure. Furthermore, the interlocked architecture of the microcapsules can endow HPIMs with excellent mechanical stability and recyclability. By adjusting sulfonation time, the morphology, shell thickness, and even mesporous size of the HPIMs can be precisely controlled. In addition, HPIMs with various compositions are obtained via this method, such as silica and aminopropyl polysilsesquioxane (APSQ). All these unique features derived from a readily available method will give products with a broader range of applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Yuhao Zhang,Haoran Gao,Mengxuan Wang,Liang Zhao,Jinsen Gao,Chunming Xu
Recent studies have investigated the separation of olefins from fluid catalytic cracking naphtha by solvent treatment to produce motor gasoline. This study explored the effect of the structure and group of six solvents on the separation of the 1-hexene–benzene and 1-hexene–thiophene systems. Solvents with a chain structure, such as N-methyl diethanolamine (MDEA) and tetraethylene glycol, showed satisfactory separation performance for olefins but poor performance for benzene and thiophene. This result can be ascribed to the weak polarity of the chain structure for the low solubility of benzene and thiophene. By contrast, solvents with a ring structure separated 1-hexene by enhancing the solubility of the mixture for the solvent, especially the dissolution of benzene and thiophene. The selective dissolution of benzene and thiophene by the solvent containing a ring structure was generally greater than that by the solvent containing a chain structure. At the highest 1-hexene content, the solubility of N-methyl diethanolamine for benzene and thiophene was higher than 11, whereas that of MDEA with the chain structure was only 7. The highly electronegative sulfoxide group improved the selectivity for olefins. The selectivity θ of 1-hexene by sulfolane and dimethyl sulfoxide in separating 1-hexene from benzene or thiophene was about 2–14 times that of alcohol amine solvents. Therefore, the ring structure primarily enhanced the processing capacity of the solvents in the separation of the olefins–aromatics/sulfide system, whereas the sulfoxide group improved the selectivity of the solvents in the separation of olefins.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 31
·13805-13813
·
IF 2.7
Lei Huai,Wenlong Liu,Bei-Bei Zhang,Ru-Ling Tang,Yi-Lei Lv,Yue-Qi Wei,Sheng-Ping Guo
Borate crystals have gathered widespread focus due to their rich chemical structures and unique properties. Four centric Ag–borates, Ag7B9O16(OH)2(1), Ag8B8O15Cl2(2), Ag8B8O15(OH)Br (3), and Ag11B8O16I3(4), with diverse B–O anion groups and frameworks have been successfully obtained by the mild hydrothermal methods. (1) and (4) have one-dimensional structures and contain {[B11O24(OH)2]17−}∞ and {[B9O20]13−}∞ anion chains, respectively. (2) is 2D borate chloride with unprecedented [B9O21] (9B: 9 : 3[(3 : Δ + 2□)) fundamental building blocks. (3) is the first hydroxy-silver borate bromide and has novel B8O19(OH)] (8B: 3Δ5□ (2(3 : Δ + 2□) + (3□) + 1 : Δ)) fundamental building blocks. (2) and (3) possess the involuted 2D B–O framework with three types of channels, namely, 12-, 16- and 20-membered-ring (MR) channels. (4) represents the first one-dimensional structure in Ag–borate iodides. Complete experimental characterizations, structural features, optical properties, and theoretical calculation analyses of (1) to (4) are presented in this work. This work provided a reference for the syntheses of new borates with diverse boron–oxygen blocks.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Yanqing Gao,Jin Hao,Jian Li,Zhanqian Song,Shibin Shang
For the purpose of chiral pesticide development, the natural chiral structure of turpentine should be applied rationally. Two series of amide derivatives were prepared to study the effect of chiral center retention on the fungicidal activity. The investigation of fungicidal activity against three pathogenic microbes was carried out extensively. Some satisfactory conclusions were obtained from the activity evaluation. Above all, compounds (5′a-l) derived from cis-myrtlecanic acid (a chiral compound obtained from β-pinene) exhibited better activity than compounds (5a-l) derived from dehydrocumic acid (achiral compound obtained from β-pinene). The overall effect was good, and it was remarkable that compounds 5′d (substitute with N-(4-(trifluoromethyl)phenyl), 5′e (substitute with N-(4-fluorophenyl)), and 5′f (substitute with N-(4-chlorophenyl)) demonstrated extremely excellent activity, with EC50 values of 1.604, 1.822, and 2.296 μg/mL against Valsa mali. The above three compounds also showed a good control effect against V. mali in vitro on an apple branch. Treatment with 5′d, 5′e, and 5′f against V. mali resulted in significantly influenced physiological and biochemical indices, as well as markedly reduced pectinase activity in comparison with untreated controls. The preliminary structure–activity relationship (SAR) was summarized, showing that compounds obtained with chiral centers, a halogen atom, and small steric hindrance showed better performance. At the same time, the quantitative structure–activity relationship (QSAR) model (R2 = 0.9288, F = 62.01, S2 = 0.0138) was obtained, and two most important structural features were maximum net atomic charge for a F atom and shadow indices. Guided by this study, the highly efficient, low-toxicity, and environmentally friendly fungicide can be prepared through reasonable modification of terpene.
研究领域:
农药学
·
有机化学
·
植物保护
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·323
·
IF 5.3
Yang Chen,Ziqing Li,Nianjing Ji,Chenxi Wei,Xiulan Duan,Huaidong Jiang
Rare-earth-doped mixed crystals have demonstrated tunable optical properties, and it is of great importance to study the structural characteristics of the mixed-crystal hosts. Herein, LuxGd1-xVO4(0 ≤x≤ 1) solid solution nanocrystals were synthesized by a modified sol–gel method, with a pure crystalline phase and element composition. The X-ray diffraction (XRD) and Rietveld refinement results showed that LuxGd1−xVO4nanocrystals are continuous solid solutions with a tetragonal zircon phase (space groupI41/amd) and the lattice parameters strictly follow Vegard’s law. The detailed local structures were studied by extended X-ray absorption fine structure (EXAFS) spectra, which revealed that the average bond length of Gd-O fluctuates and decreases, while the average bond length of Lu-O gradually decreases with the increase in Lu content. Furthermore, the binding energy differences of core levels indicate that the covalent V-O bond is relatively stable, while the ionicity of the Lu-O bond decreases with the increasingxvalue, and the ionicity of the Gd-O bond fluctuates with small amplitude. The valence band structures were further confirmed by the first-principles calculations, indicating that the valence band is contributed to by the O 2pnonbonding state, localized Gd 4fand Lu 4fstates, and the hybridized states between the bonding O 2pand V 3d. The binding energies of the Lu core and the valence levels tend to decrease gradually with the increase in Lu content. This work provides insight into the structural features of mixed-crystal hosts, which have been developed in recent years to improve laser performance by providing different positions for active ions to obtain inhomogeneous broadening spectra.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Mengshi Chen,Zihan Kang,Jingjing Ning,Ni Qin,Dinghua Bao
A novel method was established to create ZnO/ZIF-8 core/shell heterostructured film piezo-photocatalysts for highly efficient removal of pollutants from water. This method was inspired by distinctive pore structure of ZIF-8 and has the advantage of simple and quick synthesis. In this work, ZnO/ZIF-8 heterostructure thin films were created by growing ZIF-8 metal organic framework in-situ on inverse opal structure ZnO films, which also served as the porous template and zinc source of ZIF-8 simultaneously. Thus, the ZnO/ZIF-8 core/shell heterostructure is composed of ZnO core and ZIF-8 shell. The inverse opal structure enhances the process of light absorption, and the heterostructure is crucial for enhancing the carrier concentration. The ZnO/ZIF-8 heterostructure films exhibit significant degradation capacity towards Rhodamine B (RhB) and tetracycline (TC). Under UV light and ultrasound, the degradation efficiency of ZnO/ZIF-8 heterostructure is much higher than that of ZnO film and ZIF-8 film for RhB solution, indicating that the heterostructure films have a great potential for use in the field of water pollution prevention. This study not only presents an effective method for quickly creating heterostructures, but also demonstrates a path for improving the piezo-photocatalytic efficiency by manipulating the morphology and structure of ZnO/ZIF-8.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
THIN SOLID FILMS
·
2024
·
IF 2
Chenliang Huo
Recent advances in chemical etching of silicon have allowed its widespread use in the fabrication of microelectronic devices and energy converters, in which shaped silicon exhibits outstanding properties and functions. The texturing process used to fabricate light-trapping structures on silicon surfaces is an indispensable step in preparing solar cells. Here, this manuscript describes the use of a one-step wet chemical etching method with copper as a catalyst to manufacture different structures, including inverted pyramid structures and upright pyramid structures, on silicon surfaces, which can be easily controlled by varying the solution composition and etching time. Moreover, this manuscript demonstrates an exciting method for fabricating random inverted pyramid and random upright pyramid arrays of silicon. The findings provide important contributions that can help improve the fabrication methods for silicon-based solar cell devices and optimize the light trapping structure on the cell surface.
研究领域:
材料科学
·
微电子学
·
太阳能技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）