Materials
·
2025
·Vol. 18
·期 4
·744
·
IF 3.2
Ya-Long Wang,Guo-Hua Zhang
Submicron-sized TiB2powders (300 nm–1 μm) were prepared by the reaction of TiC, B4C, and Ca assisted by molten CaCl2. The optimal reaction procedure (1200 °C and 25 wt.% CaCl2+ 25 wt.% Ca) was obtained by exploring the effects of the boronization reaction temperature and the addition of an amount of CaCl2. It was found that the introduction of CaCl2not only promoted the reaction but also effectively inhibited the volatilization of excess Ca. Furthermore, SEM images of the products showed that the morphology and particle size of TiB2were inherited from the carbothermal reduction product TiC, which was dominated by the “template/growth” mechanism. The process of the boronization reaction was that B atoms migrated from B4C and replaced the C atoms in the lattice of TiC.
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
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Junqian Zhao,Huaina Yu,Shusheng Pan,Shang Zhou,Li Zhong,Hua Wang,Yuan Yuan Luo,SiuFung Yu,Guanghai Li
CsPbI 3 sub-micrometer wires were synthesized by one-pot solution method at near room temperature . The wires are single crystalline with [100] orientation. An strong emission band centered at 470 nm was observed under ultraviolet excitation, and the emission intensity and bandwidth are dependent on the molar ratio of CsI/PbI 2 in the wires. A bright green emission with a lifetime of several tens ns was observed when excited with a soft X-ray, and the spectral response range can be modulated by the molar ratio of CsI/PbI 2 in the wires. The growth mechanism of the wires was discussed, and the influences of the cycling strain and X-ray irrigation time on the X-ray excited optical luminescence of the CsI/PbI 2 wires/PET film were analyzed and discussed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yifei Chen,Meng Li,Qin Zhu,Wei Bai,Xiaofang Liu,Mingwu Xiang,Junming Guo,Jintao Liu
The Jahn-Teller effect and Mn dissolution always restrict the practical electrochemical properties of spinel LiMn 2 O 4 cathode material. Herein, a low-temperature solid-state combustion method is employed to synthesize various truncated octahedral LiZn 0.03 Al x Mn 1.97- x O 4 ( x ≤ 0.08) with submicron structure. The Zn/Al dual-doping is conducive to forming {110} and {100} planes, and is also beneficial to the crystal development of LiMn 2 O 4 . It is found that as the amount of Al doping increases, the average particle size gradually decreases from 188 nm to 113 nm. In addition, the Zn/Al co-doping integrated with small particles can improve the high-rate performance. The optimal LiZn 0.03 Al 0.03 Mn 1.94 O 4 exhibits submicron truncated octahedral morphology, high crystallinity , and good particles dispersibility . Benefiting from these structure merits, the LiZn 0.03 Al 0.03 Mn 1.94 O 4 delivers the first discharge capacity of 113.1 mAh⋅g −1 and low capacity fade of 9.9 % after 300 cycles at 1C. It also shows the high first discharge capacity of 86.6 mAh⋅g −1 at 10C and the high capacity retention of 72.1 % after 2000 cycles. Even at ultrahigh current density of 15C and 20C, the ultralong cycling lifespans over 2000 cycles are also achieved in LiZn 0.03 Al 0.03 Mn 1.94 O 4 cathode material. The excellent electrochemical properties are ascribed to its relatively high Li + diffusion coefficient (1.60 × 10 −11 cm 2 ⋅s −1 ) and low apparent activation energy (25.45 kJ⋅mol −1 ) during the de-intercalation process. The Zn/Al dual-doping and submicron truncated octahedron designs of the LiMn 2 O 4 provide a scientific reference to prepare high-performance cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 28
·285705
·
IF 3.953
Yu Zhang,Qiang Liu,Yu Liu,Jin Tong,Zhongwei Huang,Song Wu,Peilin Liang,Guannan Yang,Chengqiang Cui
A green method for the synthesis of in situ Cu paste is developed. Cu particles are prepared through chemical reduction by selecting a special copper source, reducing agent, and solvent. Then the reaction solution is directly concentrated to obtain an in situ Cu paste. The synthesis of Cu particles and the preparation of Cu paste are conducted simultaneously, and the process of separation, purification, drying, storage, and re-dispersion of powder are reduced. Particles are not directly exposed to air, thus the oxidation of micro/submicron -Cu is effectively prevented, and the agglomeration of particles caused by drying and dispersion operations is simultaneously reduced. Furthermore, the proposed method has a certain universality, and different types of Cu sources can be used to prepare in situ paste with different sizes and morphologies. The entire preparation process is simple, efficient, green, and the yield can reach 99.99%, which breaks through the bottleneck of the application of traditional micro/submicron-Cu materials. Copper acetate-based in situ paste is sintered for 30 min at 260 °C and 2 MPa in a reducing atmosphere. The shear strength, resistivity, and thermal conductivity reach 55.26 MPa, 4.01 × 10–8 Ω·m, and 92.75 W/(m·K), respectively, which could meet the interconnection application of power semiconductor devices.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 8
·1421
·
IF 2.467
Baosheng Ge,Yanyan Xu,Haoru Zhao,Haixiang Sun,Yaoli Guo,Wenguang Wang
Mixed matrix membranes (MMMs) attract great attention due to their outstanding gas separation performance. The compatibility between the fillers and the polymer matrix is one of the key points for the preparation of high-performance MMMs. In this work, MMMs consisting of metal-organic frameworks (MOFs) of amine-modified Cu-BTC (NH2-Cu-BTC; BTC = 1,3,5-benzenetricarboxylic acid) and submicrometer-sized amine-modified Cu-BTC (sub-NH2-Cu-BTC) incorporated into a Pebax-1657 polymer were fabricated for the gas separation. The SEM image and Fourier transform infrared spectroscopy (FTIR) spectra showed an increase in the surface roughness of MOFs and the presence of amino groups on the surface of Cu-BTC after the amination modification, and a decrease in the size of MOFs crystals after the submicrometer-sized aminated modification. Gas adsorption analysis indicated that NH2-Cu-BTC and sub-NH2-Cu-BTC had a higher gas adsorption capacity for CO2compared to the unmodified Cu-BTC. The scanning electron microscopy (SEM) image showed that NH2-Cu-BTC and sub-NH2-Cu-BTC, especially sub-NH2-Cu-BTC, had a better compatibility with a polyether-block-amide (Pebax) matrix in the MMMs. The gas separation performance indicated that the Pebax/sub-NH2-Cu-BTC MMMs evidently improved the CO2/N2and CO2/CH4selectivity at the expense of a slight CO2permeability. The results reveal that modified MOF-filled MMMs possess great potential for applications in the CO2separation field.Keywords:mixed matrix membranes;metal–organic framework;gas separation;amination;submicron
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Jie Chen,Ye Sheng,Xiuqing Zhou,Fei Gao,Chunming Lin,Zhan Shi,Xuechun Xu,Haifeng Zou
SiO 2 and Eu 3+ -doped SiO 2 submicron rods were conveniently fabricated via a sol–gel process at room temperature. In this process, citric acid served as a unique structural modifier through hydrolysis of TEOS at alkaline condition to obtain the silica submicron rods. The morphology of the products was sensitive to the conditions, such as stirring, gelation time and the dropping speed of NH 4 OH. By sampling the products at different reaction times, we discussed the formation and growing mechanism of SiO 2 :Eu 3+ submicron rods in detail. The weak interactions between ammonium citrate crystals and silica species may be the reasons of the rods formation. The obtained silica submicron rods were 5–6 μm in length and 650–750 nm in width and there was no obvious change after doping. Under UV light excitation, the undoped silica submicron rods exhibited blue emission, which may be associated with defect centers in the structures of the products. The Eu 3+ -doped silica submicron rods exhibited red emission, which was due to the 4f→4f transition of Eu 3+ . The effect of different doping concentrations of Eu 3+ ions on the luminescence was investigated. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), Thermo-gravimetry Analysis (TGA), Scanning electron microscope (SEM), Transmission electron microscope (TEM), Energy-dispersive spectroscopy (EDS) and Photoluminescence spectrum.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Bingqi Li,Shengping You,Wei Qi,Yuefei Wang,Rongxin Su,Zhimin He
Lignin sub-micro spheres have drawn wide attention because of their biodegradable, biocompatible and large surface area. However, the formation of stable and tunable lignin micro/nanospheres are limited by lignin source, preparation method and aggregation characteristics. Amphiphilic lignin tends to form aggregates in water under two tunable forces, including hydrophobic and hydrophilic interactions. Herein, we rationally modify the amphiphilic interface of corncob lignin (CL) with the chemical modification of four types of n-alkane to tune its amphiphilicity. Four alkylated CLs with similar chemical properties, but different interfacial interactions have been successfully synthesized. We find that n-alkane and aromatic skeleton contribute to the hydrophobic interactions to induce the aggregation of CL. The results show that modulating the hydrophobic and hydrophilic interactions can successfully promote the formation of CL sub-micro spheres (CLS) with tunable surface properties. The higher hydrophobic interactions and longer alkyl chain, the smaller size of CLS. The average diameters of CLS can be reduced from 400 nm to 100 nm by increasing the length of alkyl chain. What’s more, CLS can disperse stably in water for 60 days and in acid-base environment at pH 4–10 for 30 days.
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
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2017
·
IF 1.873
Shuanglei Peng,Guancheng Jiang,Xinliang Li,Lili Yang,Fan Liu,Yinbo He
During the process of recirculating drilling fluids, the removal of useless solids, especially submicron particles, in drilling fluids is the most problematic issue in drilling operations. The cost and efficiency of currently used technologies are the two issues that have to be addressed urgently. In this study, the novel flocculant CMC- g -DMDAAC was synthesized by grafting diallyl dimethyl ammonium chloride (DMDAAC) onto carboxymethyl chitosan (CMC). The physicochemical structure of the CMC- g -DMDAAC product was characterized by Fourier-transform infrared (FT-IR) spectroscopy, proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, and determination of the ζ-potential. A kaolinite suspension, a bentonite suspension, and drilling fluids from an oilfield were selected to evaluate the flocculation performance of CMC- g -DMDAAC by testing the products’ turbidities and particle size distributions. In comparison, the flocculation performances of chitosan, CMC, and commercial hydrolyzed polyacrylamide (HPAM) were also tested under the same conditions. The results showed that CMC- g -DMDAAC exhibited steady flocculation performances for all clay suspensions and drilling fluids at all pH ranges at low dosage. The scavenging capacity of submicron particles in drilling fluids was also excellent for the tested product.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Ling Cai,Guangxue Chen,Junfei Tian,Bin Su,Minghui He
Ionic skin with a high performance has been extensively explored due to its ability to convert external stimuli into obvious electrical signals for wearable electronics and intelligent detection. However, due to the unmatched Young’s moduli between the elastic substrate and the conductive layer, rapidly manufacturing durable ionic skin with ultrasensitivity over a wide range of pressures is still a great challenge. Here, we report a new strategy of 3D printing polymerizable deep eutectic solvent (PDES) for the manufacture of highly sensitive bioinspired ionic skin over a wide range of pressures via photopolymerization shrinkage formed submicrometer-scale protrusions on bioinspired skin structures. The 3D patterned poly(PDES) ionic skin (interlocked pyramid type with submicrometer protrusions) can realize “all-in-one” ability with high transparency, compressibility, and intrinsic conductivity, displaying ultrabroad range pressures (0.6 Pa–2 MPa) with superhigh sensitivity (348.28 KPa–1) and high electrical durability (at 0.35 MPa for 45 000 cycles). Furthermore, these excellent abilities allow as-prepared ionic skins to serve as visually detected pressure sensors for precision instruments, providing great potential in flexible wearable monitoring equipment and human-computer interaction.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 43
·22678-22687
·
IF 3.708
Qing Hu,Yuli Li,Guohou Miao,Naru Zhao,Xiaofeng Chen
We report a facile method for fabricating monodispersed mesoporous bioactive glass sub-micron spheres (MBGS) using dodecylamine (DDA) as a catalyst and template agent in a sol–gel process by self-assembly between a neutral organic surfactant and neutral inorganic precursor (S0I0). Moreover, we investigate the effect of sub-micron particle size on the physicochemical properties, apatite-forming ability, and biocompatibility of MBGS. Results showed that all samples exhibited regular spherical morphology and favorable mono-dispersibility. The average particle diameters of MBGS (200–800 nm) were controlled by adjusting the concentration of DDA. All samples induced the formation of rod-like apatite precipitates, which closely resembled the natural nanoscale apatite crystal, showing their high apatite-forming ability. Furthermore, MBGS surfaces also supported the attachment and promoted proliferation of alkaline phosphatase (ALP) activity of MG-63 cells, showing the good biocompatibility of MBGS. MBGS-1 had the smallest particle size and it was found that it could significantly enhance MG-63 proliferation and differentiation because of the smaller particle size and higher specific surface area. It is hoped that this study may motivate the development and applications of submicron biomaterials for bone repair applications.
研究领域:
材料科学
·
生物医学工程
·
骨组织工程
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Zhonghua Bao,Ke Li,Shuo Wang,Kai Gao,Dongliang Zhang,Mei Li
Submicron-cerium oxide particles were synthesized by applying hypergravity using ammonium bicarbonate (precipitant) and cerium nitrate hexahydrate (precursor). The influence of the concentration, pH, dispersant loading, flow rate, rotation speed of the hypergravity rotating bed, calcination temperature, and time on the cerium oxide particle size were examined by zeta potential, solid–liquid contact angle, thermo-gravimetry–differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, and transmission electron microscopy. The cerium oxide particles were highly dispersed, with an average particle size of 200 nm. Calcining at 650 °C for 1.5 h afforded the smallest particles. The crystallite size and fraction crystallinity increased with prolonged calcination. Crystalline cerium dioxide grew along three crystal planes, forming a complete face-centered cube, affording high hardness and activity of the polishing powder. The optimal conditions were: cerium nitrate concentration: 0.7 mol/L, cerium nitrate/ammonium bicarbonate molar ratio: 1:3, dispersant mass fraction: 3%, cerium nitrate initial pH: 4–5; the precursor solution was adjusted to pH 9 with ammonia water. Hypergravity coprecipitation with 1.5 h calcination afforded submicron-sized cerium oxide with a uniform size distribution using ammonium bicarbonate in an industrially viable process. The simple and low-cost manufacturing process may enable the development of hypergravity-assisted chemical synthesis technology.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 7
·2101908
·
IF 6.389
Meng Miao,Zhipeng Wang,Zhiming Guo,Jinfeng Xing
A quasi solid–liquid reaction strategy is proposed that is based on the instantaneous transformation of structured solid ligand aggregation into insoluble Cu 3 (HITP) 2 metal–organic framework (MOF) aggregation without morphologic change (HITP = 2,3,6,7,10,11-hexaiminotriphenylene). The initial 3D ordered submicron macropores (TOM) in ligand aggregation can be maintained during the transformation due to the extremely rapid rate of coordination reaction. In this case, the in situ synthesis of the Cu 3 (HITP) 2 MOF film with large-scale TOM structure (TOM-Cu 3 (HITP) 2 film) on ceramic-based gold interdigital electrode (IDE) is achieved. Scanning electron microscope is used to confirm the morphology in each stage of synthetic process. Spectroscopic characterizations prove that there is no essential difference between TOM-Cu 3 (HITP) 2 film and ordinary Cu 3 (HITP) 2 MOF, except for slight differences in the contents of individual surface functional group and integral crystallinities, respectively. Notably, TOM structure endows the TOM-Cu 3 (HITP) 2 film with a dramatic promotion in sensitivity to H 2 S gas. The resistive response of the IDE loaded with TOM-Cu 3 (HITP) 2 film to the 80 ppm H 2 S gas reaches 78.5 at room temperature, which is 6.7× more than that of the Cu 3 (HITP) 2 film without TOM structure. The method of obvious universality allows the authors to perform in situ synthesis directly on the desired substrate without transfer process.
研究领域:
材料科学
·
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）