Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Danfeng Cao,Yingchao Zhang,Zhanchen Cui,Yuanyuan Du,Zuosen Shi
In order to obtain an ideal material using for artificial corneal skirt, a porous polymer hydrogel containing 2-hydroxyethyl methacrylate (HEMA), trimethylolpropane triacrylate (TMPTA) and butyl acrylate was prepared through one-step radical polymerization method and the usage of CaCO 3 whisker as porogen. The physical-chemical properties of the fabricated polymer hydrogel can be adjusted by CaCO 3 whisker content, such as pore size, porosity, water content of materials and surface topography. Then a series of cell biology experiments of human corneal fibroblasts (HCFs) were carried out to evaluate its properties as an artificial corneal skirt, such as the adhesion of cells on the materials with different pore size and porosity, the apoptosis on materials with different characteristics, the distribution of the cells on the material surface. The results revealed that high porosity not only could improve water content of hydrogel, but also strengthen the adhesion of HCFs on hydrogel. In addition, high porosity hydrogel with the whisker shape of pores showed much elongate spindle-like morphology than those low porosity hydrogels. MTT assay certified that the resulted polymer hydrogel material possessed excellent biocompatibility and was suitable for HCFs growing, making it promising for being developed as artificial corneal skirt.
研究领域:
材料科学
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组织工程
·
眼科
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Jin-Hong Guo,Yi-Jiang Zeng,Jia-Le Chen,Sheng-Guo Lu
Barium zirconate titanate (BZT) (Ba(ZrxTi1–x)O3) ceramics with Zr4+ contents of x = 5, 10, 15, 20, 25, and 30 mol % were prepared using a solid-state reaction approach. The microstructures, morphologies, and electric properties were characterized using X-ray diffraction, scanning electron microscopy, and impedance analysis methods, respectively. The dielectric analyses indicate that the BZT bulk ceramics show characteristics of phase transition from a normal ferroelectric to a relaxor ferroelectric with the increasing Zr4+ ionic content. The electrocaloric effect adiabatic temperature change decreases with the increasing Zr4+ content. The highest adiabatic temperature change obtained is 2.4 K for BZT ceramics with a 5 mol % of Zr4+ ionic content.
研究领域:
材料科学
·
物理学
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70351
·
IF 3.8
Lulu Jiang,Wenqi Lei,Zhiming Zhao,Kejia Chen,Chuangchang Lei,Donglin Han
Ba 3 MoNbO 8.5 is a recently emerging hexagonal perovskite-derivative oxide with high oxide ion conductivity. Mo and Nb-sites were commonly doped with acceptor dopants to regulate the transport properties. In this work, Ba-site was introduced with cation deficiency and doped with K. The tolerance of Ba-deficiency ( x ) in Ba 3‒ x MoNbO 8.5‒ x is within 0.03–0.06, and the solubility of K ( x ) in Ba 3‒ x K x MoNbO 8.5‒ x /2 is higher than 0.3. Although forming Ba-deficiency of x = 0.03 does not influence the conductivity significantly, doping K to x = 0.15 and 0.3 decreases the bulk conductivity obviously. Furthermore, even though these samples can be hydrated, H 2 O/D 2 O isotope effect was not observed, indicating that there is no or negligibly small proton conduction, and hydration even decreases the bulk conductivity. Interestingly, doping K reduces the difference in conductivity between the measurements in the dry and wet atmospheres. By annealing in a wet atmosphere for 90 h, the Ba 2.7 K 0.3 MoNbO 8.35 composition is unstable at 400°C, but shows good chemical stability at 600°C.
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Nature Communications
·
2026
·
IF 18.1
Wang Wei,Tang Yonghua,Su ZhuiZhui,Liu Huanmin,Liu You-Nian,Tang Dingguo,Zhou Peng
Photocatalytic carbon–carbon coupling offers a route for converting plastic-derived chemicals into valuable multi-carbon products, yet uncontrolled coupling of intermediate limits efficiency and selectivity. Here, we report atomically dispersed barium species on titanium dioxide that act as frustrated Lewis pairs, enabling efficient and selective generation intermediates during the co-oxidation of ethylene glycol and methanol toward lactic acid. The barium species create interstitial states near the Fermi level, enhancing charge separation and surface redox activity. Meanwhile, barium sites promote the formation of transient •CHOHCH 2 OH radicals from ethylene glycol, while lattice O generates stable *CH 3 intermediates from methanol. Their directed cross-coupling yields lactic acid at rate of 2.04 ± 0.08 mmol g –1 h –1 with 81.8 ± 2.4 % carbon selectivity, alongside H 2 evolution at 5.85 ± 0.23 mmol g –1 h –1 . In this work, we show an alkaline-earth frustrated Lewis pairs for selective solar-driven cross-coupling reaction.
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高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Leilei Li,Jie Xu,Shuyao Cao,Qian Chen,Junting Liu,Emilia Pawlikowska,Mikołaj Szafran,Feng Gao
B-site complex perovskite Ba(Zr 0.1 Ti 0.9 )O 3 microcrystals at micron size with a plate-like shape was successfully synthesized using topochemical microcrystal conversion and molten salt method. A plate-like Bi 4 (Zr 0.1 Ti 0.9 ) 3 O 12 precursor was first synthesized by Zr 4+ substitution of Ti 4+ using molten salt. Then plate-like 4–9 μm Ba(Zr 0.1 Ti 0.9 )O 3 microcrystals with an average thickness <500 nm were synthesized by mixing BaCO 3 , Bi 4 (Zr 0.1 Ti 0.9 ) 3 O 12 , and KCl molten salt at 800 °C. Finally, the topochemical microcrystal conversion reaction between BaCO 3 and Bi 4 (Zr 0.1 Ti 0.9 ) 3 O 12 precursor was carried out. The results pave the way for fabricating plate-like B-site complex perovskite microcrystals.
研究领域:
材料科学
·
无机化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiao-Dong Jian,Biao Lu,Dan-Dan Li,Ying-Bang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
Barium zirconate titanate (Ba(Zr x Ti 1-x )O 3 ) thick film ceramics were prepared using a tape-casting method. Their structures, morphologies, and electric properties were characterized using XRD , SEM and impedance analysis approaches, respectively. The electrocaloric effects (ECE), i.e., isothermal entropy changes and adiabatic temperature changes, were calculated using a Maxwell relation. It was confirmed by XRD and SEM that the obtained thick film ceramics are pure and dense perovskite structures. The dielectric analyses indicate that the Ba(Zr x Ti 1-x )O 3 thick film ceramics show characteristics of transition from normal to relaxor ferroelectrics with the increasing Zr 4+ ionic content. The polarization – electric field (P-E) hysteresis loops reveal larger polarizations and the ceramics can withstand an electric field as high as 12 MV/m. The adiabatic temperature changes ΔT calculated via the Maxwell relation and the polarization as a function of temperature, which is extracted from the P-E hysteresis loops measured at 12 MV m −1 are from 3.7 to 0.28 K with the increasing Zr 4+ ionic content.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
POLYMER BULLETIN
·
2024
·
IF 3.1
Gong Zheqing,Chen Lijun
Butyl acrylate, methyl methacrylate, vinyl acetate and tertiary vinyl carbonate (VeoVa10) are the main monomers, and alkyl alcohol polyether sulfosuccinate monoester sodium salt (A-6820) and alkyl alcohol polyoxyethylene ether (EFS-900) are used as the emulsifiers. Vinyl triethoxysilane is used as the modified monomers. Potassium persulfate is the initiator. The silicon-modified polymer latex is prepared via the semi-continuous seeded emulsion polymerization. The structure of the latex film is characterized by Fourier transform infrared spectroscopy. Latex films are tested by the thermogravimetric analysis, differential scanning calorimetry and contact angle. The particle size of the latex is measured with the zetatrac dynamic light scattering instrument. The conditions for preparing the resultant latex is optimized and obtained as follows: the amount of emulsifier is 6 wt%; the amount of initiator is 0.4 wt% and the amount of VETS is 4 wt%. The appearance of the resultant latex is translucent and blue, and the average particle size of the polymer latex and its distribution is small. The water contact angle increased from 68.07 to 91.00 °. Thermal decomposition temperature of the film of the silicone-modified polymer latex is 16.17 °C higher than that of the film of conventional polymer latex.
研究领域:
材料科学
·
化学工程
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高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Dilare Halmurat,Xinyu Zhang,Litipu Aihaiti,Rong-Jun Xie
Eu 2+ -doped phosphors show broadband absorption, tunable emission and high quantum efficiency due to the parity-allowed 5d→4f transitions, allowing them to be used in solid-state lighting. To expand their applications in other fields such as detection and sensing technologies, the Eu 2+ emission needs to be tuned into the near-infrared region, but it is a big challenge to obtain Eu 2+ near-infrared region emitters due to the absence of host compounds with extremely large crystal-field splitting. In this work, we chose M 4 Li(BN 2 ) 3 (M = Ca, Sr, Ba) as a host and realize the near-infrared region emission of Eu 2+ in it. Among these phosphors, Ba 4 Li(BN 2 ) 3 :Eu 2+ exhibits the longest emission of 880 nm and the largest full-width at half maximum of 276 nm under 450 nm excitation, while Ca 4 Li(BN 2 ) 3 :Eu 2+ and Sr 4 Li(BN 2 ) 3 :Eu 2+ emit at 740 and 680 nm, respectively. We observe an interesting phenomenon that the energy shift of emission is linearly related to the radius difference between the alkaline earth cation and the activator Eu 2+ in this system.
研究领域:
材料科学
·
光学
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 28
·19165-19172
·
IF 4.449
Lihong Bao,Xiaoping Qi,Tana,Lumen Chao,O. Tegus
Multiple nanocrystalline rare-earth hexaborides La1−xBaxB6 have been synthesized via a single step solid-state reaction. The Ba doping effects on crystal structure, grain morphology, magnetic and optical absorption properties were investigated using XRD, FESEM, HRTEM, SQUID magnetometry and optical measurements. The results show that all the Ba-doped hexaborides crystallize in the CsCl-type single phase, indicating the Ba atoms occupied the lattice sites of LaB6. The optical absorption results indicate that the absorption valleys of LaB6 are red-shifted from 622 nm to 780 nm when the Ba doping content increases to x = 0.8. The first-principle calculation results reveal that Ba doping reduces the total kinetic energy of the electrons of LaB6, which lead to the absorption valleys moving toward a higher wavelength. Meanwhile, the band gap of BaB6 obtained from optical absorption is in good agreement with the theoretical calculation results. The magnetic measurements results showed that Ba doping lead to room-temperature ferromagnetism of LaB6 due to the different ionic radii of La3+ and Ba2+ causing intrinsic crystal defects, which is directly observed experimentally by HRTEM. This is the first time that we have found the tunable optical and ferromagnetic behavior of Ba doped nanocrystalline LaB6. Thus, nanocrystalline La1−xBaxB6, as multi-functional materials, should open up a new route to extend the optical and magnetic applications of LaB6 nanopowder.
研究领域:
材料科学
·
凝聚态物理
·
纳米材料
·
功能材料
·
磁学
·
光学材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Shuaihang Qiu,Mingliang Li,Gang Shao,Hailong Wang,Jinpeng Zhu,Wen Liu,Bingbing Fan,Hongliang Xu,Hongxia Lu,Yanchun Zhou,Rui Zhang
A novel entropy-stabilized (ES) (Ca,Sr,Ba)ZrO 3 ceramic has been designed and synthesized by pressureless sintering of CaZrO 3 , SrZrO 3 and BaZrO 3 powders mixtures at 1450 °C, 1500 °C and 1550 °C for 3 h. X-ray diffraction, scanning electron microscopy and transmission electron microscopy analyses collectively indicate that a single solid solution is formed with a homogeneous distribution of metal elements after sintering at 1550 °C. The relative density and hardness of the ES (Ca,Sr,Ba)ZrO 3 ceramic sintered at 1550 °C are 97.79 % and 10.84 ± 0.33 GPa, respectively. This ES (Ca,Sr,Ba)ZrO 3 exhibits lower thermal conductivity from 373 K to 1073 K than their constituting zirconates , CaZrO 3 , SrZrO 3 and BaZrO 3 . Most importantly, the ES (Ca,Sr,Ba)ZrO 3 ceramic possesses good corrosion resistance to TiNi alloy melt and no distinct reaction layer exists between TiNi alloy and ES (Ca,Sr,Ba)ZrO 3 ceramic in the contact region. The combination of these properties indicates that ES (Ca,Sr,Ba)ZrO 3 ceramic is promising for use as a novel crucible material for the melting of titanium alloys .
研究领域:
材料科学
·
陶瓷
·
冶金学
·
热工工程
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DOI
高影响因子
Science China-Physics Mechanics & Astronomy
·
2018
·Vol. 61
·期 9
·1-4
·
IF 2.754
Zhang Yue,Liu Wenhao,Si Jin,Zhu Xiyu,He Chengping,Zhao Haonan,Wen Hai-Hu
Superconductivity is observed in a new nontoxic cuprate system Ga-Ba-Ca-Cu-O, with T c = 82 K for GaBa 2 Ca 5 Cu 6 O 14 + δ ( 5 (Ga-1256) and T c = 116 K probably for GaBa 2 Ca 3 Cu 4 O 10+δ (Ga-1234) or GaBa 2 Ca 2 Cu 3 O 8+δ (Ga-1223), respectively. All compounds are fabricated by solid state reaction method under high pressure and high temperature. Samples are characterized by resistivity, magnetization and X-ray diffraction (XRD) measurements. The temperature dependence of magnetization measured in both zero-field-cooled and field-cooled processes on one sample (S1) shows two superconducting transitions at about 82 K and 113 K. The estimated shielding fraction for the phase with T c of 82 K is about 67%, while the fraction for another phase with T c of 113 K is quite small. The XRD Rietveld refinement for S1 indicates two main phases existing in the sample, Ga-1256 with fraction of about 58% and non-superconducting Ca 0.85 CuO 2 with fraction of about 42% respectively. Thus, we can conclude the superconducting phase with transition temperature of 82 K is due to Ga-1256. The resistivity measurement also confirms the superconductivity for S1, and the resistivity reaches zero at about 82 K. The temperature dependence of magnetization for another sample (S2) shows much higher superconducting shielding fraction for the phase with T c of 116 K, which may be a promising prospective for the synthesis of Ga-1234 or Ga-1223 phase.
研究领域:
凝聚态物理
·
超导物理
·
材料科学
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Yuchun Ren,Xixi Zhang,Chaoxin Yang,Zixiao Li,Yanghua Luo,Shengjun Sun,Fatma A. Ibrahim,Mohamed S. Hamdy,Imran Shakir,Guanwei Cui,Xuefei Liu,Xuping Sun,Bo Tang
Direct seawater electrolysis is promising for green hydrogen production from earth’s most abundant water resource, but its anode suffers from chloride-induced corrosion. Herein, Ba-doped NiFe layered double hydroxide supported on Ni foam (Ba-NiFe LDH/NF) is demonstrated as a high-performance anode for durable alkaline seawater oxidation. Such Ba-NiFe LDH/NF needs only an overpotential of 342 mV to achieve 1000 mA cm–2 and operates stably for 1500 h with negligible degradation and minimal active chlorine generation. Ba doping not only accelerates catalyst surface reconstruction but also favors the selective adsorption of OH– vs Cl– over the anode. The membrane electrode assembly electrolyzer composed of Ba-NiFe LDH/NF and Pt/C/NF demonstrates stable operation at 1000 mA cm–2 for 500 h.
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