CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tianbao Xie,Rongxia Huang,Junhui Tan,Yan ning Luo,Hua-Tay Lin,Yejing Dai
CaBi 2 Nb 2 O 9 (CBN) is a bismuth layered ferroelectric material with extremely high Curie temperature and low dielectric loss, which has great application potential in ultra-high temperature field. However, because of its low piezoelectric coefficient, its practical application still faces great challenges. This study successfully prepared Ca 1-x Ce x Bi 2 Nb 1.98 (W 2/3 Mn 1/3 ) 0.02 O 9 ( x = 0–0.05) two-layer ferroelectric ceramics using direct-reaction sintering method. A pseudo tetragonal structure was successfully constructed near x = 0.02 using the substitution method of Ce 4+ at site A, and W 6+ and Mn 4+ at site B, which altered the crystal structure of CBN based ceramics. The properties of CBN-based piezoelectric ceramics have been significantly improved by this modification. It has a higher piezoelectric constant ( d 33 = 20.6 pC/N) and Curie temperature ( T c = 950 °C), while having a lower dielectric loss (tan δ = 0.031 at 500 °C). In addition, CaBi 2 Nb 2 O 9 based piezoelectric ceramics also show excellent thermal stability. After annealing at 900 °C for 2 h, the d 33 value remained high at 19.2 pC/N, retaining about 93.2% of its original value. Therefore, these findings indicate that Ca 1-x Ce x Bi 2 Nb 1.98 (W 2/3 Mn 1/3 ) 0.02 O 9 is a high-temperature piezoelectric material with great potential.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Weiwei Zhang,Ziwei Yuan,Ao Sun,Jiacheng Liu,Meng Xiao
In the current work, CeO 2 nanoparticles were embedded in Ni-W alloy matrix by pulse electrochemical deposition on copper substrate to optimize their microstructure and corrosion resistance. The effects of CeO 2 concentration and deposition time on Ni-W/CeO 2 composite coating were investigated for optimized structure and improved corrosion resistance. The composite coatings present nodular-like surfaces with dense and compact growth profiles, containing 63.03–67.88 wt% Ni, 28.73–31.87 wt% W and 0.25–8.24 wt% Ce. The content of incorporated CeO 2 in coatings increased with the increase of CeO 2 concentration in electrolyte. The addition of CeO 2 particles has refined the grains of the prepared coating. The surface became rougher with the extension of electrodeposition time. Ni-W/CeO 2 composite coating electrodeposited at 10 g L −1 CeO 2 for 60 min possessed the highest corrosion resistance, indicating enhanced corrosion protection and long-term stability. This premium coating can be applied in harsh environments to prolong the lifespan of machinery, equipment, and parts in marine, vehicle, aerospace, and chemical industries.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 40
·2404044
·
IF 18.5
Zhenkun Liu,Xiangli Che,Wei Wang,Gesong Huang,Wenjie Huang,Chenyu Liu,Qi Liu,Ye Zhu,Zhan Lin,Dong Luo
Lithium-rich layered oxides (LLOs) have gained significant attention due to their high capacity of over 250 mAh g −1 , which originates from the charge compensation of oxygen anions activated under high voltage. However, the charge compensation of oxygen anions is prone to over-oxidation, leading to serious irreversible oxygen release, surface-interface reactions, and structural evolution. These detriments make LLOs undergo fast voltage decay and capacity fading, which have hindered their practical applications for many years. Herein, this work develops a multifunctional co-doping strategy and constructs W─O bonds with strong bonding interaction and covalence, low bond energy Li─S bonds with non-binding electrons near the Fermi level, and continuous and homogeneous surface spinel-like layer induced by W/S co-doping. Their synergistic effect significantly mitigates the irreversible oxygen release and surface-interface reactions and improves structural stability of Li-rich layered cathodes. Thus, the designed and prepared Co-free Li-rich layered cathode (Li 1.232 Mn 0.574 Ni 0.191 W 0.003 O 1.995 S 0.005 ) delivers superior voltage and capacity stability. Its capacity retention after 400 cycles is as large as 86%, and its voltage decay rate from the 10th to the 400th cycle is only 0.626 mV cycle −1 .
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chunyang Zhang,Yifan Wang,Zexiong Wang,Shilong Zhao,Ruoshan Lei,Shiqing Xu
The development of ultrasensitive thermometric phosphors has become an active area of research due to their appealing applications in the contactless temperature detection field. Herein, the scheelite-related compounds—CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ and CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ , which exhibit high sensing capacity—are successfully prepared and systematically characterized. The X-ray diffraction analysis reveals that CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ exhibits the monoclinic structure, whereas CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ is in the tetragonal phase. The maximum phonon cut-off energy of CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ is 929 cm −1 , slightly larger than that of CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ (904 cm −1 ). Irradiated by 980 nm laser, PL spectra consist of the Nd 3+ : 4 F j → 4 I 9/2 (j = 7/2, 5/2, 3/2) and Yb 3+ : 2 F 5/2 → 2 F 7/2 emissions located in the near-infrared (NIR) range. Negative and positive thermal quenching behaviors are observed for the emissions of Nd 3+ (754, 802, and 868 nm) and Yb 3+ (1008 nm), respectively, attributed to the cooperative effects of the phonon-assisted energy transfer process of Yb 3+ → Nd 3+ and excited state absorption process of Nd 3+ . Moreover, the host material can affect the luminescence properties, thermal enhancement factor of the NIR anti-Stokes emission, and thermal sensing performance of the Nd 3+ -Yb 3+ pair. Consequently, CaGd 2 (MoO 4 ) 4 : Nd 3+ , Yb 3+ exhibits higher sensing sensitivity (S r-max = ∼6.00%K −1 ) than CaGd 2 (WO 4 ) 4 : Nd 3+ , Yb 3+ (S r-max = ∼5.56%K −1 ). This study provides useful information for the construction of high-performance ratiometric thermometers based on the inverse thermal dependence of the NIR emissions of Nd 3+ and Yb 3+ ions.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Enjing Huang,Ziling Li,Fangyuan Zhou,Qinyu Chen,Jiayong He,Xiangyuan Xiong,Youfa Xie,Hongxia Gao,Liqiang Zou
Probiotics offer health benefits but often lose viability during processing and digestion, hindering their use. Therefore, we developed oil-phase gel O/W high internal phase emulsions (HIPEs) by incorporating beeswax to encapsulate Lactiplantibacillus plantarum subsp. Plantarum ( L. plantarum ). The incorporation of 1% and 2% beeswax reduced droplet size while improving the physical stability and strengthening the gel structure of the HIPEs. Crucially, incorporating beeswax markedly improved the retention of L. plantarum within the HIPEs oil phase. In addition, the oil-phase gelled HIPEs enhanced the thermal resistance of L. plantarum at 72 °C and 65 °C. It also imparted storage stability, which was 7.42 log 10 CFU/g with 1% beeswax for 30 days storage at 4 °C. The addition of beeswax to the oil phase of HIPEs minimized L. plantarum 's viability loss in the gastrointestinal tract. This study contributes to the development of a probiotic emulsion encapsulation system that reaches the colon with high viability.
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PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jie Wang,Xin Wang,Jia Gu,Ruyun Ding,Siying Xu,Wei Chen,Hui Zheng,Xiaoxiao Guo,Peng Zheng,Liang Zheng,Yang Zhang
Diamond/Cu composites are ideal materials for thermal management in high-power electronic devices. The use of W coating can enhance the interfacial bonding of the composites and improve the room temperature thermal performance. However, its high-temperature thermal performance cannot be guaranteed. This study constructs diamond/W-Cu/Cu dual-layer interface structures based on coated W to further optimize the high-temperature thermal performance of the composites. This work synthesized diamond/Cu composites with various interface structures by varying the sintering temperature and time. The results indicate that the W-WC composite interface has a higher thermal conductivity than the W-W 2 C-WC interface structure, and a peak thermal conductivity of 660 W/(m·K) is achieved at an interface structure of 52 nm W-108 nm WC, corresponding to a thermal expansion coefficient of 5.2 ppm/K. A dual-layer interface structure was next constructed. While the results show that the dual-layer interface composites have better high-temperature thermal properties and bonding with the interface. The relative density of the composite was increased by nearly 2.8 % and its thermal conductivity was increased to 698 W/(m·K), while the high-temperature thermal conductivity degradation (at 200 °C) was reduced from 33.5 % to 29.5 %. Additionally, it achieves a 25 % reduction in high-temperature coefficient of thermal expansion (CTE) and improves thermal stability by 50 %. Its low thermal resistance and high thermal stability provide an innovative solution for the thermal management of high heat flow density electronics.
研究领域:
材料科学
·
热管理技术
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huizhen Wang,Pengfei Yang,Dongzheng Liu,Mengzhen Yu,Bowen Zhou,Yubing Zhang,Zhenyu Xiao,Weiping Xiao,Zexing Wu,Lei Wang
Developing efficient electrocatalysts for hydrogen evolution reaction (HER) in full pH range can promote the practical applications of hydrogen energy. In this work, nitrogen doped carbon nanosheets supported RuM (Mo, W, Cr) (RuM/NCN) are prepared through an ultrafast microwave approach. The carbon nanosheet structure coupled with the ultrasmall RuM nanoparticles can expose rich active sites to optimize the catalytic activity. Moreover, the strong metal-support interactions also favor to accelerate the reactions kinetics and improve stability. Thus, the developed RuMo/NCN (RuW/NCN) show excellent HER catalytic activities with overpotentials of 72 (75) mV, 82 (82) mV and 124 (1 1 9) mV to reach current density of 10 mA cm -2 in 1 M KOH, 0.5 M H 2 SO 4 and alkaline seawater , respectively, and also achieve excellent performance in 1 M PBS. This work provides a valid and novel avenue to design efficient electrocatalysts in renewable energy-related fields.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
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高影响因子
Journal of Physical Chemistry C
·
2013
·
IF 4.814
Bin Hu,Huan Liu,Kai Tao,Chunrong Xiong,Shenghu Zhou
Tungsten-doped mesoporous KIT-6 (W-KIT-6), mesoporous silica supported WO3/KIT-6, and traditional silica supported WO3/SiO2 catalysts have been successfully synthesized and tested for catalytic metathesis of 1-butene and ethene to propene. The resultant materials were comprehensively characterized by XRD, BET, TEM, UV–DRS, IR, XPS, H2-TPR, and TGA. For W-KIT-6 catalysts, high concentration of W5+ species by XPS and the difficulty of reduction of W species by TPR suggested the incorporation of W species into the KIT-6 framework. The studies of small-angle XRD, BET, and TEM illustrated that the 3D ordered mesoporous structure and their high surface area of KIT-6 were maintained in W-KIT-6. The doped W-KIT-6 illustrated superior catalytic performance to the supported WO3/KIT-6 and WO3/SiO2 catalysts. The origin of catalytic performance enhancement for W-KIT-6 was preliminarily discussed and was assigned to the incorporation of W species into KIT-6 framework. This study demonstrated the influence of neighboring environment of active components on catalytic performance and was helpful to design metathesis catalysts.
研究领域:
催化化学
·
材料科学
·
化学工程
·
无机化学
·
多孔材料
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Mengdie Zhou,Guang Yang,Xiaohua Tian,Songlin Xue,Hao Li,Jianming Pan
Hybrid polymer nanosheets are promising sorbents owing to large surface area, but their complicated synthesis procedure and high cost hinder to apply in particular field of selective separation. In this work, one step Pickering oil-in-water-in-oil (O/W/O) double emulsion (DE) stabilized by palmitic chloride modified halloysite nanotubes (HNTs) were firstly designed for preparing polymer nanosheets (PMBA-PMA) by UV irradiation. Subsequently, amino ethyl benzo-12-crown ether (B12C4-NH 2 ) was covalently immobilized onto the PMBA-PMA to achieve functional hybrid polymer nanosheets (PMBA-PMA-CE) for the effective and selective recovery of lithium ion (Li + ). External metastable W/O interface produced droplets’ coalescence, and the Pickering DE droplets with irregular morphology eventually initiated the formation of polymer nanosheets. PMBA-PMA-CE exhibited cured and nanosheet-like structure constructed by HNTs and polymer networks. The batch mode experiments demonstrated that the fast adsorption equilibrium of PMBA-PMA-CE towards Li + could be reached within 100 min, and the results well followed pseudo-second-order model, confirming the chemical adsorption based on "Size-match" effect. The maximum monolayer adsorption capacity calculated from Langmuir model was 14.67 mg g −1 at 298 K. Benefiting from specific “size-match” complexation, the obtained PMBA-PMA-CE possessed an excellent selectivity towards Li + even in the presence of competitive cations, and selectivity coefficient ( α ) and relative selectivity coefficient ( α r ) were greater than 1.43 and 8.29, respectively. In addition, PMBA-PMA-CE could be simply regenerated and maintained above 90% of the initial capacity after five consecutive adsorption-desorption cycles. Furthermore, the incorporation of cheap HNTs not only endowed one step emulsion DE droplets, but also improved the sorbents’ mechanical property.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaohui Ma,Wenjun Li,Chaojun Ren,Hongda Li,Xintong Liu,Xinyang Li,Tianyu Wang,Mei Dong,Shujing Liu,Shaowei Chen
Herein, noble-metal-free In 2 S 3 -WC and In 2 S 3 -based photocatalysts with dual cocatalysts of flower-like MoS 2 and bulk WC were synthesized through a facile solvothermal reaction. Electrochemical results indicated WC increased the interface conductance of photocatalyst and boosted the transference of photogenerated carriers. The optimal In 2 S 3 -WC show a hydrogen production rate of 128.11 μmol·h −1 ·g −1 , which is around 6 times higher than In 2 S 3 -1%Pt (20.73 μmol·h −1 ·g −1 ). The above results demonstrate commercial WC has a crucial impact of replacing precious metal and separating carriers. Morphology characterization exhibited hydrangea In 2 S 3 and flower-like MoS 2 were attached to bulk WC. Gratifyingly, photocurrent, impedance and photoluminescence results demonstrated MoS 2 further effectively separated the photogenerated carriers. Remarkably, the higher hydrogen generation rate of 390.52 μmol·h −1 ·g −1 obtained by the optimal ternary In 2 S 3 -WC-MoS 2 composite was around 3 and 18 times higher than the optimal In 2 S 3 -WC and In 2 S 3 -1% Pt. The photocatalytic results demonstrated that "W-Mo auxiliary pairs" was a great efficient synergistic cocatalyst for In 2 S 3 to increase active sites and improve e - -h + pairs separation for H 2 generation. Furthermore, a probable reaction mechanism of the enhanced photocatalytic H 2 generation was also proposed. This presented research provides an effective concept to design novel and efficient noble-metal-free photocatalyst with "W-Mo auxiliary pairs" for prominent H 2 generation activity.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 15
·7171-7176
·
IF 3.269
Jing Chen,Qin Ma,Caihe Wang,Xiaoyan Hu,Yunjing Gao,Huan Wang,Dongdong Qin,Xiaoquan Lu
A novel strategy was developed for the fluorescence detection of nitrite (NO2−) in real samples. The method is based on the reaction of water-dispersible graphite-like carbon nitride (w-g-C3N4) with nitrite (NO2−) in an acidic medium to form a new kind of weak fluorescence species. Under optimal conditions, the limit of detection (LOD) for nitrite (NO2−) detection was determined to be 0.16 nM (S/N = 3), and the relative fluorescence intensity versus logarithm concentration of nitrite (NO2−) showed good linearity in the range from 0 to 58.5 μM with R2 = 0.997. This probe displayed several appealing properties including low-cost, simplicity and convenience, high sensitivity, and excellent selectivity.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xuemei Yao,Yatuan Ma,Xiya Miao,Shulei Li,Yufeng Du,Yun Cheng,Yue Yang,Xianchao Du,Huajuan Deng,Huiling Geng,Ruijin Yu
The propensity of carbon dots (CDs) to undergo significant self-quenching in the solid state, whether due to excessive resonance energy transfer or direct molecule collision, has significantly limited their application in light-emitting diodes (LEDs). However, incorporating electron-deficient boron atoms, guanidine functional groups, and boron hydroxyl groups proves advantageous in forming a hydrogen bond structure network. This network effectively suppresses the self-quenching phenomenon observed in solid CDs, thereby enhancing their potential for use in LEDs. Therefore, on this basis, a series of multicolor tunable solid-state fluorescent CDs were obtained, and their formation mechanism was discussed. The structure and morphology of the prepared series of multicolor tunable CDs were also characterized. The photoluminescence quantum yield (PLQY) of B-CD, Y-CD, and R-CD is 34.3 %, 23.7 %, and 20.5 %, respectively. The prepared series of CDs were used to successfully package the red, blue, and yellow monochromatic LEDs. By adjusting the ratio of CDs of different colors, a single matrix white-LEDs (w-LEDs), two primary colors w-LEDs, and the full-carbon-based w-LED of three primary colors are also obtained. The correlated color temperature of the above three w-LEDs is 7277, 3957, and 5040 K, the Color Rendering Index is 88, 91, and 92, and color coordinates are (0.302, 0.319), (0.376, 0.355), and (0.344, 0.354), respectively. It is demonstrated that CDs are a promising material in the solid-state lighting field.
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高影响因子
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