ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Guoan Lin,Xiaoxiang Xu
LaTiO2N has been considered as one of the most promising photocatalysts for solar energy conversion. Nevertheless, it generally has a poor photocatalytic activity under normal conditions, probably linked to severe structural distortions and various types of defects within this compound. Herein, we modified LaTiO2N by introducing Ba into its A site, that is, La0.8Ba0.2TiO2.2N0.8. The presence of Ba at the A site of LaTiO2N not only relaxes the structural distortions but also effectively inhibits defect formation (e.g. Ti3+ species) in LaTiO2N. Moreover, surface hydrophilicity of LaTiO2N is also improved by Ba modification. Photoelectrochemical analysis suggests that charge separation and transferring situation are ameliorated in Ba-modified LaTiO2N, and the valence band edge position is positively shifted. These factors are likely the reasons for the improved photocatalytic activity of La0.8Ba0.2TiO2.2N0.8 in water oxidation reactions.
研究领域:
材料科学
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光化学
·
太阳能转换
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Yue Xu,Hang Gao,Yan Shen,Shigan Chai,Jinzhi Zhang,Qichao Zou
Novel Gemini quaternary ammonium salts (GQASs) with ester groups were synthesized. Cationic poly(styrene- co -butyl acrylate) (P(St- co -BA)) nanolatex was synthesized in the presence of GQASs as emulsifier. The structures of GQASs were characterized with Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy; the property of P(St- co -BA) nanolatex was characterized with dynamic light scattering. The results indicated that GQASs and P(St- co -BA) nanolatex with GQASs were successfully synthesized. GQASs, nanolatex, and the polymer films exhibited excellent antibacterial activities against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli . The GQASs performed even better than the corresponding single-stranded quaternary ammoniums. The antibacterial mechanism was also preliminarily studied, and longer, softer hydrophobic chains of GQAS had stronger antibacterial activity. The work provided a novel, simple approach for developing high-efficiency antibacterial polymer material with a low cost, which has broad biomaterial applications.
研究领域:
材料科学
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生物学
·
医学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 10
·5875-5884
·
IF 10.7
Hui Guo,Yifeng Li,Lulu Jiang,Yenan Sha,Shihang Guo,Donglin Han
Proton conducting oxides are attracting increasing attention due to their promising application as electrolytes in solid-state electrochemical devices for energy conversion and chemical production, including protonic ceramic fuel cells, electrolyzers and membrane reactors. BaZrO3 and Ba(Zr,Ce)O3 substituted by acceptor dopants are currently the most promising proton conductors. In principle, replacing Zr or Ce with one kind of trivalent element (e.g., Y or Yb) can generate oxygen vacancies, which are necessary for the hydration reaction to introduce charge carriers of protons. However, it is commonly recognized that substituting Zr or Ce with Y and Yb simultaneously leads to high performance of the devices, but the reason is not clear. In this work, we studied the transport properties of four different compositional classes: BaZr0.8−xCexY0.2O3−δ (BZCY20), BaZr0.8Y0.2−xYbxO3−δ (BZYYb), BaZr0.1Ce0.7Y0.2−xYbxO3−δ (BZCYYb) and BaCe0.8Y0.2−xYbxO3−δ (BCYYb), at 600, 650 and 700 °C. For BZCY20, the ionic conductivity decreases on replacing Zr in BZY20 with x = 0.1 of Ce, increases with increasing Ce content within x = 0.1–0.5, and decreases on further increasing Ce content from x = 0.5 to 0.8. The ionic transport number increases with increasing Ce content. The ionic conductivity, partial conductivity of oxide ions and hole conductivity of BZCYYb and BCYYb increase with increasing Yb content. Since the increment of hole conductivity is larger, the ionic transport number decreases. For BZYYb, the ionic conductivity decreases and the hole conductivity increases with increasing Yb content, leading to decreasing ionic transport number. Both the high ionic conductivity and transport number are vital factors governing the performance of protonic ceramic cells (PCCs). Therefore, the improved performance of PCCs by adding both Y and Yb into the electrolyte cannot be explained from the viewpoint of electrical properties of the electrolytes. Thereby, we summarized our recent series of studies on the chemical compatibility between the electrolyte and NiO negatrode substrate, and suggested that the loss of dopant was suppressed by partly replacing Y with Yb. The high ionic conduction of the electrolyte can be maintained after co-sintering at high temperature to fabricate PCCs. This might be the real reason for the high performance of the devices using Y and Yb co-substituted electrolytes, prepared by the co-sintering method.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 22
·5451
·
IF 4.2
Sidra Chaudhary,Qin Pan,Yong Wu,Zainab Bibi,Xiaoyong Li,Qinxiang Jia,Yang Sun
A series of Fe–Ba mixed oxides, including a pure Fe-containing sample as a reference, have been synthesized via a sol–gel process using Fe3+or Fe2+salts and BaSO4as raw materials, with Pluronic P123 serving as a template. These oxides have been thoroughly characterized and subsequently utilized as catalysts for the chlorination of various organic molecules. Commercial hydrochloric acid, known for its relative safety, and environmentally friendly aqueous hydrogen peroxide were employed as the chlorine source and oxidant, respectively. The pure Fe-containing catalyst displays excellent thermal stability between 600 and 800 °C and exhibited moderate to high conversions in the chlorination of toluene, benzene, andtert-butyl hydroperoxide, with remarkableortho-selectivity in chlorination of toluene. The combination of Fe3+salt with BaSO4in the sol–gel process results in a Fe–Ba mixed oxide catalyst composed of BaO2, BaFe4O7, and Fe2O3, significantly enhancing the chlorination activity compared to that displayed by the pure Fe catalyst. Notably, the chlorination oftert-butyl hydroperoxide (TBHP) does not require additional oxidants such as H2O2, and involves both electrophilic substitution and nucleophilic addition. Notably, the chlorination of bromobenzene yields chlorobenzene as the sole product, a transformation that has not been previously reported. Overall, this catalytic chlorination system holds promise for advancing the chlorination industry and enhancing pharmaceutical production.
研究领域:
化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Chuan Yu,Shenyu Lan,Sentai Cheng,Lixi Zeng,Mingshan Zhu
Removal of pharmaceuticals and personal care products (PPCPs) from water by mechanical energy-driven piezocatalysis is a promising technology for environmental remediation that highly depends on the design of efficient piezocatalyst. In this study, Ba-substituted SrTiO 3 piezoelectric materials were constructed and used for piezocatalytic degradation of carbamazepine (CBZ) from water. The Ba 0.5 Sr 0.5 TiO 3 (BSTO-2) achieved the optimal performance, exhibiting 94.5% removal efficiency for CBZ (10 mg/L) after 30 min in the presence of BSTO-2 (0.5 g/L) and ultrasonic vibration (40 kHz, 100 W) with the minimal energy consumption. The kinetic rate constant was up to 0.106 min −1 , which were 1.86 and 2.08 times as high as that of pure SrTiO 3 and BaTiO 3 , respectively. The enhanced piezocatalytic activity was attributed to its distorted structure and modified conductivity, resulting in a higher piezoelectric response and faster interfacial charge transfer. The involved reactive species, the effects of operational condition (catalyst dosage, CBZ concentration, solution pH, anions, water matrices and different pollutants), and the possible degradation products and their toxicity were discussed in detail. The work is of great significance to develop highly efficient piezocatalysts and highlights the potential of piezocatalysis in water remediation .
研究领域:
环境科学
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材料科学
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水处理技术
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Hao Li,Fei Liu,Lijin Cheng,Jiarui Huang,Shaojun Liu
Complex perovskite-structured Ba(Zn 1/3 Nb 2/3 )O 3 (BZN) ceramics with high B-site 1:2 ordering degree and excellent dielectric properties were successfully fabricated using digital light processing (DLP). BZN ceramic slurry with 82 wt. % solid loading, low viscosity, and high curing properties was used to prepare green bodies. The samples were exposed to debinding process in vacuum and then sintered at 1350–1450 ℃ for 4 h. The as-sintered BZN ceramics with disordered B-site structure exhibited significantly low dielectric properties. However, the BZN ceramics annealed at 1300 ℃ for 24 h with high B-site 1:2 ordering degree exhibited excellent dielectric properties ( ε r = 38.9, Q × f = 89,600 GHz, and τ f = 22 ppm/℃) that were identical to those of dry-pressed ceramics. Furthermore, a DLP-fabricated cylindrical BZN dielectric resonator antenna exhibited a >90% radiation efficiency and resonant frequency of 7.10 GHz ( S 11 = -29.94 dB), which is consistent with the simulation results.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Haoyun Deng,Zhixiong Yang,Mengzhen Zhou,Encai Ou,Yanbing Lu,Qiulan Zhou,Kun Liu,Weijian Xu
( Z )-1,3-pentadiene (Zp) exhibits a rigid planar molecular structure and is known for the typical 1,5-sigmatropic hydrogen shift, while it is commonly considered an inert monomer during polymerization. Herein, by utilizing the steric effect of the terminal methyl in Zp, the high trans -1,4-polypentadiene (HTPD) with highly ordered microstructure and well-defined sequence are successfully synthesized using barium dithymol/ tert- butyllithium/ tri -ethylaluminum trimetallic initiators based on anionic polymerization. The significant dependence of polymerization rate and trans -1,4-selectivity on ratio of Ba/Al/Li is demonstrated. The modification in microstructure ( trans -1,4 content ranging from 75 % to 92 %) and stereo-regularity (isotactic triad mm % > 65 %) are confirmed by nuclear magnetic resonance (NMR). Compared with the poly(( Z )-1,3-pentadiene) (PZp) prepared by n -BuLi containing σ -ligand modifiers, the strategy using a large steric initiator to achieve regular insertion of Zp into polymer chains is proved to be effective. Kinetics studies demonstrated that Ba–Al–Li system is characterized by retarded anionic polymerization (RAP), yet it shows a quasi-living process and enabling the preparation of stereometric block polymers such as polyisoprene- b -HTPD (PI- b -HTPD). Thermal performance analysis indicates that the obtained highly ordered polymers show superior thermoplastic properties ( T m = 77.4 °C) with crystallinity as an elastomer. Furthermore, reasonable interpretations for the structure formation, sequence, and rate reduction effected by the Ba/Al/Li trimetallic initiator are proposed.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Chendong Yang,Entao Li,Xiaoping Guo,Wenyu Xie,Yuanzhan Wang,Xuefei Huang,Sandra Chiu,Xuanjun Wu
Over the past 3 years, SARS-CoV-2 Omicron has been circulating globally with the emergence of multiple subvariants, including BA.5, BA.5.2, XBB, XBB.1, EG.5.1, HK.3, BA.2.86, JN.1, and KP.2. To combat these Omicron subvariants, several vaccines based on receptor-binding domain (RBD) dimers have been developed; however, RBD dimer vaccines require frequent updates to cope with the emergence of new variants. In contrast, the development of a safe, effective, and broad-spectrum vaccine against multiple Omicron subvariants, including the latest JN.1 and KP.2, would be a one-size-fits-all solution. Here, we designed BA.4/5 RBD-PC7A conjugate micelles by displaying the BA.4/5 RBD in PC7A micelles. Remarkably, the micelles elicited potent neutralizing antibodies (NAbs) in rabbits, effectively neutralizing BA.5.2, XBB.1.18, and HK.3 infections. Moreover, the micelles alone were able to induce NAbs in mice against the BA.5 variant. When a cytosine-phosphate-guanine (CpG) adjuvant was added and electrostatically adsorbed to the micelles, there was a significant increase in the antibody titers of IgG1, IgG2b, and IgG2c. This enhancement facilitated the broad neutralization of various strains, including BA.5.2, XBB.1.18, HK.3, JN.1, and KP.2. Furthermore, the micelles adsorbed with CpG protected golden hamsters from infection with the BA.5.2 strain. This study presents a potent and broadly neutralizing nanovaccine that includes the BA.4/5 RBD antigen and a CpG adjuvant. It demonstrates efficacy against multiple Omicron subvariants, including BA.5, BA.5.2, XBB.1.18, HK.3, JN.1, and KP.2, highlighting its potential for clinical translation.
研究领域:
免疫学
·
病毒学
·
疫苗学
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产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2024
·
IF 3.8
Shang Xiujuan,Wang Hongdong,Yu Yongbo,Gu Jin,Zeng Jian,Hou Sinan
Antimicrobial photodynamic therapy (aPDT) has emerged as a highly promising strategy for non-antibiotic treatment of infections due to its unique advantages in efficient bactericidal action and reduction of drug resistance. The natural photosensitizing properties of curcumin (Cur) are widely acknowledged; however, its limited bioavailability has impeded its practical application. In this study, we developed a nanomaterial called Cur@ZIF-8@BA by encapsulating Cur within ZIF-8 and modifying the surface with boric acid (BA). The Cur@ZIF-8@BA exhibits pH-responsive properties and enhances bacterial binding, thereby effectively promoting photodynamic therapy. Moreover, its antibacterial activity against E. coli, Staphylococcus aureus and A. baumannii is significantly increased in the presence of light compared to a dark environment. The mechanism behind this may be that BA increases the affinity of Cur@ZIF-8@BA towards bacteria, and making released Zn2+ and BA from the nanomaterial increase bacterial cell membrane permeability. This facilitates efficient delivery of Cur into bacterial cells, resulting in generation of abundant reactive oxygen species (ROS) and subsequent bactericidal activity. In conclusion, our prepared Cur@ZIF-8@BA holds great promise as a photodynamically mediated antimicrobial strategy.
研究领域:
纳米技术
·
药学
·
微生物学
·
治疗学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 72
·42335-42342
·
IF 3.049
Bo Huang,Xinxin Luo,Qichao Zou,Suxiao Wang,Jinzhi Zhang
We reported an innovative transparent, elastic and flexible conductive composite materials P(SSNa-BA-St)/PEDOT/graphene which were prepared by using P(SSNa-BA-St) latex as template for PEDOT polymerization and graphene doping. This P(SSNa-BA-St)/PEDOT/graphene film exhibited highly transparent, good water resistance, low moisture adsorption, highly elastic and highly conductive properties, which can serve as a practical approach to fabricate the flexible, conductive and transparent films for wearable and implantable electronic devices, and photovoltaic cells.
研究领域:
材料科学
·
纳米技术
·
电气工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Xiaoke Zheng,Shanling Wang,Lan Wu,Xiandeng Hou
It is appealing to develop a facile way to prepare a binary CT contrast agent with good biocompatibility and CT contrast efficiency for potential clinical applications. In this work, a novel binary CT contrast agent based on the biocompatible nano-hydroxyapatite (nHAp, the main inorganic component of human bone and teeth) was prepared facilely and rapidly through doping two kinds of CT contrast ions (Ba 2+ and Ho 3+ ) into the nHAp host via microwave-assisted synthesis. The Ba/Ho co-doped nHAp with pure nHAp phase composition and good mono-dispersion was obtained simply with microwave heating for 30 min. The as prepared CT contrast agent is very promising as a novel binary CT contrast agent for CT imaging.
研究领域:
材料科学
·
纳米技术
·
医学成像
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yuqi Yang,Longlong Zeng,Xiaoyan Li,Zaisheng Cai
Glasses such as automobile windshields, mirrors, and lampshades are prone to fogging due to temperature changes, which affects the process of use and even jeopardizes safety. Hydrophilic films can prevent the glass surface from fogging by absorbing condensation droplets. However, the anti-fog film only lasts for a short period because it will gradually dissolve with the moisture increasing, which leads to image distortion. Herein, we propose a hydrophilic/hydrophobic coating to achieve longer anti-fog persistence. The strong interface bonding of the polymer is the key to improving the durability performance of the coating. It prevents interfacial failure and folding caused by fogging conditions. In this paper, a multifunctional coating with good anti-fog and anti-frost properties was prepared using butyl acrylate (BA), acrylic acid (AA) and 4-benzoylphenyl acrylate (BPA) as the polymer monomers . The light transmission of coated glass is up to 90 % even under harsh fogging conditions. The poly(AA- co -BA-co-BPA) can be firmly bonded with the plasma-treated glass plate, which greatly enhances the durability and water resistance of the coating. After being immersed in deionized water for 60 h at room temperature, the coated glass still has a certain anti-fog effect and the light transmittance is maintained at about 85 %. In addition, the anti-fog coating has excellent self-healing properties due to the fact that the carboxyl group in AA can generate hydrogen bonding , so that it can be healed within 15 s with the help of hot water after physical damage. This anti-fog coating has great potential for application in construction, shipbuilding and other industries.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）