ACS Omega
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2026
·
IF 5.2
Panpan Xu,Xiaole Qiu,Bing Sun,Li Sun,Ensi Cao,Wentao Hao
Abstract Colossal permittivity (In,Nb) codoped TiO2 ceramics are promising for microelectronic applications but suffer from high low-frequency dielectric loss primarily due to leakage currents across grain boundaries. This work demonstrates that Zr4+ doping at Ti-sites in (In0.5Nb0.5)0.05Ti0.95O2 effectively mitigates this issue. A series of (In0.5Nb0.5)0.05Ti0.95-xZrxO2 (x = 0–0.20) ceramics were synthesized via solid-state reaction. Zr4+ incorporation refines grain size from ∼56.1 μm (undoped) to ∼2.5 μm (x = 0.20) and promotes the precipitation of an insulating ZrTiO4 secondary phase at grain boundaries for compositions with x ≥ 0.10. These microstructural modifications synergistically enhance the grain boundary resistance, which peaks at 10.50 × 106 Ω·cm for the x = 0.10 composition, nearly an order of magnitude higher than the undoped ceramic. Consequently, the low-frequency dielectric loss is significantly reduced, with the x = 0.10 composition sintered at 1450 °C exhibiting a minimal loss tangent. Complex impedance analysis reveals the introduction of a new interfacial polarization associated with the ZrTiO4/INTO phase boundaries. XPS analysis confirms that Zr doping suppresses oxygen vacancy concentration without altering the Ti3+/Ti4+ ratio crucial for electron-pinned defect dipoles. The optimized composition (x = 0.10) also shows improved nonlinear coefficient (α = 2.8) and breakdown field (Eb = 530 V/cm), alongside stable low loss (tanδ < 0.05) over a broad temperature range at 1 kHz. This study presents a viable defect-engineering strategy utilizing Zr4+ doping to achieve low-loss colossal permittivity in (In,Nb) codoped TiO2-based ceramics for practical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
·
IF 9.6
Mengxiang Liu,Kaifu Yang,Jiale Fan,Kaibo Yu,Zihan Kong,Tao Zhang,Xiaoxiao Huang
Al 2 O 3 -mediated interface engineering builds multifunctional MXene composites. • Heterogeneous interfaces regulate dielectric response and thermal insulation. • Optimized composite achieves −62.76 dB RL min with excellent thermal insulation. Developing lightweight multifunctional materials that integrate efficient microwave absorption and thermal insulation remains a significant challenge for advanced electromagnetic protection applications. Herein, Al 2 O 3 -mediated MXene-derived TiO 2 /N-doped carbon composites (AMNC) were engineered via a facile freeze-drying/thermal treatment strategy. During fabrication, in situ generated Al 2 O 3 nanorods established abundant heterogeneous interfaces with MXene-derived TiO 2 and the N-doped carbon framework, constructing a hierarchical interface architecture that effectively regulated dielectric behavior. The synergistic effects of enhanced interfacial polarization, optimized conductive networks, and improved impedance matching endowed the AMNC composites with superior electromagnetic wave attenuation capability. The optimized AMNC-1 achieved a minimum reflection loss (RL min ) of −62.76 dB at a thickness of 2.43 mm and a maximum effective absorption bandwidth (EAB max ) of 5.12 GHz at only 1.88 mm. The corresponding specific reflection loss values (SRL l and SRL lt ) reached 313.80 and 129.14, respectively, demonstrating excellent lightweight microwave absorption capability. Furthermore, CST simulations revealed a radar cross-section reduction of 34.62 dB m 2 under normal incidence, indicating promising radar stealth capability. Owing to the interconnected porous structure and Al 2 O 3 -mediated heterogeneous interface architecture, AMNC-1 exhibited excellent thermal insulation performance, maintaining a surface temperature of only 51.5 °C after heating on a 100 °C hot plate for 30 min. This work highlights the critical role of Al 2 O 3 -mediated heterogeneous interfaces in tailoring dielectric response and thermal insulation behavior, providing a rational strategy for designing lightweight multifunctional composites with synergistic electromagnetic absorption and thermal insulation performance. Download: Download high-res image (204KB) Download: Download full-size image
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Bin Xu,Maohua Hou,Qinqin Xu,Jieying Su,Haitao Zhang,Xiaohui Lu,Zhongjin Ni
In recent years, artificial amorphous photonic structure (APS) materials with high color saturation and angle independence have been competitively reported. However, there is a lack of research into their functionalization and application in practical environments. Here, with practical applications in mind, we prepared APS pigments based on CB@SiO2@TiO2 core–bishell nanospheres and demonstrated high color saturation, enhanced color stability, and excellent photocatalytic activity. SiO2 effectively protected the carbon black particles from ablation during the calcination process. Paints composed of ethanol, ethyl cellulose (EC), and pigments could be spray-coated on any substrate to prepare a structurally colored coating without limitation. The coatings show good mechanical stability and photothermal stability. The color of the structurally colored pigments can be easily changed by adjusting the sizes of the CB@SiO2@TiO2 nanospheres. The photocatalytic activity of the pigments on formaldehyde (HCHO) and methylene blue (MB) solution and reaction kinetics of their degradation were studied by experiment. The results showed that the photocatalytic activity of the pigments increased with the increase of the TiO2 loading, and the degradation rate of HCHO reached 96.7% for 3 h and that of MB reached 97.9% for 60 min when the TiO2 shell thickness was 40 nm. The structurally colored pigments based on CB@SiO2@TiO2 nanospheres effectively solve the environmental problems caused by the application of pigments and have a promising future in the fields of color decoration, display, and painting.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Huan Cheng,Kuang Luo,Xiaojun Wen,Jie Yang,Jumei Li
The development of sensitive, reliable, and robust substrates for surface-enhanced Raman spectroscopy (SERS) heavily relies on the creation of numerous hot spots. In this study, we propose a simple approach to fabricate core-satellite composites composed of AgTNP@TiO 2 @Ag, where Ag triangular nanoplates (AgTNPs) act as the cores, TiO 2 serves as the interlayer, and Ag nanoparticles are deposited around them to form Ag satellites. By adjusting the amount of AgNO 3 , we precisely control the coverage of Ag nanoparticles on AgTNP@TiO 2 @Ag, thus fine-tuning their SERS sensitivity. Various characterization techniques were employed to examine their composition, morphology, and crystal structure. Thanks to the abundant hot spots created by the Ag satellites, these composites exhibit significantly enhanced SERS sensitivity and they demonstrate the capability to detect methylene blue (MB) at a concentration of 10 −10 M by portable Raman spectrometer. Moreover, the AgTNP@TiO 2 @Ag composites effectively enable in situ SERS monitoring of the photodegradation reaction of MB. Overall, the novel AgTNP@TiO 2 @Ag composites prepared in this study exhibit high SERS sensitivity and excellent photocatalytic performance, making them highly valuable for environmental detection and ecological restoration purposes.
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Polymers
·
2023
·Vol. 15
·期 21
·4308
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IF 5
Kai Jiang,Jiang Li,Margaret Brennan,Charles Brennan,Haiyan Chen,Yuyue Qin,Mingwei Yuan
The aim of this study was to prepare a novel pH-sensitive smart film based on the addition of purple garlic peel extract (PGE) and TiO2nanoparticles in a sodium alginate (SA)/polyvinyl alcohol (PVA) matrix to monitor the freshness of beef. FT-IR spectroscopy revealed the formation of stronger interaction forces between PVA/SA, PGE, and TiO2nanoparticles, which showed good compatibility. In addition, the addition of PGE improved the tensile strength and elongation at break of the composite film, especially in different pH environments, and the color response was obvious. The addition of 1% TiO2nanoparticles significantly improved the mechanical properties of the film, as well as the light barrier properties of the film. PGE could effectively be uniformly dispersed into the composite film, but it also had a certain slow-release effect on the release of PGE. PGE had high sensitivity under different pH conditions with rich color changes, and the color showed a clear color change from red to yellow-green when the pH increased from 1 to 14. The same change was observed when it was added to the film. In particular, by applying this film to the process of beef preservation, we judged the freshness of beef by monitoring the changes in the TVB-N value and pH value during the storage process of beef and found that the film showed obvious color changes during the storage process of beef, from blue (indicating freshness) to red (indicating non-freshness), and finally to yellow-green (indicating deterioration), which indicated that the color change of the film and the freshness of the beef maintained a highly consistent.Keywords:smart packaging;anthocyanins;color response;beef freshness;indicator film
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DESALINATION
·
2023
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IF 9.9
Jing Song,Yihan Li,Shihan Wang,Rui Han,Yu Ba,Ying Liu,Shengqiang Fan
Membrane Electro-Bioreactor (MEBR), with dual function of electrochemical in-situ membrane fouling mitigation and pollutants removal by chlorine evolution reaction (CIER), has emerged as a promising technology of treating mariculture wastewater. However, the fouling control mechanism regarding extracellular polymeric substance (EPS) variations and related microbial community is still unclear. In this study, MEBR was developed with conducting anode-membrane modified by CNTs-TiO 2 -PEDOT for fouling resistant and ammonia/nitrite removal. The CIER electroactivity was enhanced that onset potential negatively shifted from 1.12 to 0.98 V vs. SCE (saturated calomel electrode). Ammonia removal rate (71.49 mgN/(L·day)) was 176.8 % higher and nitrite was significantly reduced in MEBR than MBR at HRT of 45 min. Membrane fouling was mitigated in MEBR that operation duration was extended by 40 % compared with MBR. The EPS of cake layer on the membrane surface rather than the biofilters was found the main fouling contributor. The significant reduction in LB-EPSp (65.4 %) in MEBR (33.8 % in MBR) was the dominant factor contributing to membrane fouling alleviation, which highly depended on the relative abundance of Hyphomonas and Hirschia . This study will be beneficial for fouling control in seawater treatment.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
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IF 4.2
Haihong Wang,Huiyan Ma,Yan Li,Lin Cheng,Jucai Yang,Juming Liu
Efficient, low-cost, and easily scalable wide-spectral-responsive TiO2 photocatalysts are still extremely desired in driving photocatalytic degradation toward practical applications. In this work, a modified TiO2 with a narrow band gap and low valence band (VB) (CC-OV-TiO2) was successfully synthesized based on a facile sol–gel and low-temperature carbonization process, which can be used for the photocatalytic degradation and mineralization of a wide range of phenols. The results show that the interstitial doping of carbonates and the modification of surface oxygen vacancy (OV) defects together contribute to the formation of the VB tail states, which substantially narrow the band gap of TiO2 and widen the photoresponse range. Meanwhile, the carboxylated carbon species induce a substantial downward shift of the VB edge through coordination of the electron-withdrawing carboxyl groups, which further enhances the oxidation ability of the photogenerated holes. Accordingly, CC-OV-TiO2 with a narrow band gap and low VB exhibits superior and stable photocatalytic performance.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Jiasheng Wang,Qingrong Wang,Mengdi Zhao,Ming Bao
Toluene gas-phase oxidation is a green, chlorine-free production process for benzaldehyde but its conversion efficiency is still unsatisfying due to the lack of highly efficient catalyst. Here the selective oxidation of toluene to benzaldehyde over V-Ag-Ce/TiO 2 under an air atmosphere was investigated. The catalyst was prepared by impregnation and characterized by scanning electron microscope (SEM), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Electron paramagnetic resonance (EPR), H 2 temperature programmed reduction (H 2 -TPR), O 2 temperature programmed desorption (O 2 -TPD), and NH 3 temperature programmed desorption (NH 3 -TPD). The amount of oxygen vacancy and acid of the catalyst can be tuned through adjusting the V:Ag:Ce ratio. Over the optimum catalyst (V:Ag:Ce = 4:2:1, molar ratio), 92% benzaldehyde selectivity with a 27% toluene conversion can be obtained at 550 °C. Medium amounts of oxygen vacancy (0.43) and acidity (0.10 mmol/g) are found to be conducive to the conversion of toluene to benzaldehyde. This study has important theoretical guiding significance for improving conversion efficiency from toluene to benzaldehyde by gas-phase aerobic oxidation.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Jialin Jia,Stefanos Giannakis,Dong Li,Boyin Yan,Tao Lin
A novel catalytic system for effective photocatalytic inactivation of Escherichia coli ( E. coli ) was constructed by anchoring Ag nanoparticles (AgNPs) on silane coupling agent (SCA) pretreated TiO 2 nano-tube arrays (Ag/SCA/TiO 2 NTAs). Morphology and structural analyses revealed that SCA could disperse AgNPs evenly on TiO 2 NTAs, thus inducing a superior surface plasmon resonance (SPR) effect. Ag/SCA/TiO 2 NTAs catalyst exhibited excellent inactivation performance when in the presence of peroxymonosulfate (PMS) and visible light (VL), with 6-log E. coli was completely inactivated within 60 min, which was 5.3, 12.5 and 13.2 times higher than that of Ag/SCA/TiO 2 NTAs/VL, PMS/VL and Ag/SCA/TiO 2 NTAs/PMS/dark systems, respectively. Additionally, the photocatalyst exhibited a highly reusable property, with the inactivation performance almost unchanged after ten cycles of uses with minimal Ag leaching. The inactivation mechanism analysis demonstrated that both radical (SO 4 •- , OH) and non-radical (h + , 1 O 2 ) pathways involved in E. coli inactivation, and SCA played a pivotal role in the production of reactive species. Chloride ions (Cl − ) greatly enhanced the inactivation efficiency, while bicarbonate (HCO 3 − ) and phosphate (H 2 PO 4 − ) showed an inhibitory effect. Humic acid (HA) displayed a dual effect on inactivation performance, where the low concentration of HA facilitated the bacteria inactivation, while the higher dose suppressed bacteria inactivation. Moreover, the system exhibited excellent inactivation performance in tap water . This work first used SCA as the binder to fix AgNPs on TiO 2 NTAs for VL photocatalytic inactivation of bacteria with the assistance of PMS, which was expected to provide some insights into the practical treatment of drinking water .
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Luyao Jin,Xintao Xu,Yanghui Wang,Jiaying Li,Kaihao Fan,Bo Hu,Yi Shen,Xuesong Liu
A series of MnO x /TiO 2 based NO x reduction catalyst was prepared by excessive impregnation method. The catalyst was modified by Ce, W and oxidizing agent H 2 O 2 . Mn-Ce/Ti-H and Mn-Ce-W/Ti-H catalysts exhibit the best low temperature activity (nearly 80% NO x conversion at 155–325 °C) and the widest active temperature range (nearly 80% NO x conversion at 180–420 °C), respectively. Property and structure of the modified catalyst were characterized by XRD, TEM, XPS, H 2 -TPR, NH 3 -TPD, etc. It is found that oxidizing agent H 2 O 2 , as well as the high dispersion and specific surface area, can increase the amount of Mn 4+ , Ce 3+ and active oxygen sites on catalyst surface, and the synergistic interaction between Mn and Ce facilitated redox process of the catalysts. These can improve the low temperature activity of the catalyst by facilitating “fast SCR” reaction. The addition of W increased acidity of the catalyst and improved high temperature catalytic activity of the catalyst.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Kunpeng Liu,Nan Wang,Jianhua Li,Fanglin Du,Baorong Hou,Ruiyong Zhang
Electrochemical two-electron water oxidation reaction (2e − WOR) to produce H 2 O 2 has been widely concerned. However, four-electron competition reaction causes the large overpotential and low production rates of 2e − WOR, which restrict its’ development and application. Herein, we prepared N-TiO 2 derived from NH 2 -MIL-125 by the hydrothermal combined with calcination method. We found that N-TiO 2 as photoanode exhibited the well properties of photoelectrocatalysis water oxidation, which gave an overpotential of 630 mV at 1 mA cm −2 . The overpotentials of N-TiO 2 was approximately 130 mV (at 1 mA cm −2 ) lower than NH 2 -MIL-125, and even lower than the previous reported TiO 2 , which may attribute to the increased oxygen vacancy with the calcination process and N doping. In addition, we investigated the degradation performance of the prepared catalysts to degrade methylene blue by photoelctrocatalysis on-site the preparation of H 2 O 2 . It was shown that N-TiO 2 performed high degradation efficiency (∼91%) and excellent stability. The possible mechanism was speculated due to the increased oxygen vacancy and N doping. This work provides a new idea for photoelectrocatalysis water oxidation materials and points out a new way for on-site H 2 O 2 production for direct use.
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Materials Today Communications
·
2023
·
IF 3.8
Junyao Zhang,Yaqiang Dong,Yanqiu Li,Liping Yang,Xingjie Jia,Ling Zhang,Lingwen Cai,Aina He,Jiawei Li,Xincai Liu,Baogen Shen
Currently, power electronic devices are developing to meet the requirement of miniaturization, high-frequency and low-power consumption, reducing the high-frequency loss of soft magnetic powder cores (SMPCs) is one of the popular research topics. The construction of multilayer insulating structures can reduce the core loss ( P cv ) of SMPCs by increasing the resistivity. In this work, a composite inorganic insulating layer of phosphate and TiO 2 was successfully synthesized on the powder surface by phosphating and then sol-gel method. At last a nanocrystaline SMPCs with excellent soft magnetic properties were prepared with epoxy resin as the binder. The cores were heat-treated at 510 ℃ for 1 h to achieve optimum soft magnetic properties, with a low P cv of 854 mW/cm 3 at 20 mT and 2 MHz, an effective permeability ( μ e ) of 40 at 10 MHz and excellent DC bias with a percent permeability of 74% of the initial value at 100 Oe. The synergistic effect of the epoxy - TiO 2 - phosphate - nanocrystalline powder multilayer interface effectively reduces inter-particle eddy current loss, resulting in a significant reduction in the P cv of the SMPCs.
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