Engineering
·
2019
·
IF 4.568
Lin Chen,Jing Feng
Ferroelastic AB O 4 type RETaO 4 and RENbO 4 ceramics (where RE stands for rare earth) are being investigated as promising thermal barrier coatings (TBCs), and the mechanical properties of RETaO 4 have been found to be better than those of RENbO 4 . In this work, B -site substitution of tantalum (Ta) is used to optimize the thermal and mechanical properties of EuNbO 4 fabricated through a solid-state reaction (SSR). The crystal structure is clarified by means of X-ray diffraction (XRD) and Raman spectroscopy; and the surface microstructure is surveyed via scanning electronic microscope (SEM). The Young’s modulus and the thermal expansion coefficient (TEC) of EuNbO 4 are effectively increased; with respective maximum values of 169 GPa and 11.2 × 10 −6 K −1 (at 1200 °C). The thermal conductivity is reduced to 1.52 W·K −1 ·m −1 (at 700 °C), and the thermal radiation resistance is improved. The relationship between the phonon thermal diffusivity and temperature was established in order to determine the intrinsic phonon thermal conductivity by eliminating the thermal radiation effects. The results indicate that the thermal and mechanical properties of EuNbO 4 can be effectually optimized via the B -site substitution of Ta, and that this proposed material can be applied as a high-temperature structural ceramic in future.
研究领域:
材料科学
·
固态物理
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Journal of Environmental Chemical Engineering
·
2026
·
IF 7.5
Ying Xue,Xiaonan Hao,Yue Wu,Yang Xu,Jundi Long,Jian Dong,Yuanrui Wang,Shulin Sun
Combined NVP grafting and MMT@ZIF-8@TA modification raised pure water flux to 836.84 L·m⁻²·h⁻¹, ~6.8× of pristine PLA membrane. • The membrane retained over 95% rejection for four cationic/anionic dyes, realizing charge-selective adsorption (98% MeB removal, 99% AO removal). • PZ4 membrane removed 78.59% methylene blue under UV in 150 min; its rate constant (0.00995 min⁻¹) was ~110 times the blank group. • Superoxide (•O₂⁻) and hydroxyl (•OH) radicals were verified as the main active species during photocatalytic degradation. Rapid industrialization and urbanization have exacerbated water scarcity and pollution. Traditional polymer membranes are non‑renewable and non‑biodegradable. Polylactic acid (PLA) is a biodegradable and renewable alternative, but its hydrophobicity and lack of functional groups restrict its direct application in water purification. To address these limitations, we grafted N‑vinylpyrrolidone (NVP) onto PLA chains via free‑radical polymerization to obtain PLA‑g‑PVP with enhanced hydrophilicity. Zeolitic imidazolate framework‑8 (ZIF‑8) was grown in situ on montmorillonite (MMT) and coated with tannic acid (TA) to obtain MMT@ZIF‑8@TA nanoparticles, which synergistically improve membrane porosity, adsorption capacity, and photocatalytic activity. A series of PLA‑g‑PVP/MMT@ZIF‑8@TA (PZ) membranes were fabricated by non‑solvent induced phase separation. The PZ4 membrane exhibited a pure water flux of 836.84 L·m⁻²·h⁻¹ , approximately 6.8 times that of pristine PLA, and achieved over 95% rejection for four representative dyes, including both cationic (auramine O, methylene blue) and anionic (congo red, methyl blue) dyes. After five cycles, the flux recovery rate remained 81.03% with dye rejection > 90%, showing excellent reusability. The PZ membranes also demonstrated adsorption and photocatalytic activity. The PZ4 membrane degraded 78.59% of methylene blue within 150 min under UV irradiation, attributed to efficient separation of photogenerated electron‑hole pairs and synergistic oxidation by hydroxyl (·OH) and superoxide (·O 2 ⁻) radicals, leading to dye mineralization. This eco‑friendly membrane integrates high separation efficiency, which shows great potential for the purification of dye-containing wastewater, and sheds light on the design of multifunctional composite filtration membranes. Download: Download high-res image (266KB) Download: Download full-size image
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhangyi Huang,Zhengwei Zhu,Mingyu Su,Yang Shi,Mao Deng,Ruichong Chen,Zhijun Wang,Zhi Zhou,Jianqi Qi,Haomin Wang
This study investigated the high-temperature oxidation behaviors of TMC ceramics. The results indicate that the high-temperature oxidation curves of the four TMC ceramics follow a parabolic law, suggesting a diffusion-controlled process. The activation energies for the oxidation of TaC, NbC, TiC, and ZrC ceramics are 105.4, 124.3, 169.3, and 78.7 kJ/mol, respectively, with oxidation rate constants at 1000 °C of 16.84, 40.45, 0.18, and 14.43 mg 2 /cm 4 ·h for each ceramic, respectively. The temperatures at which the ceramics disintegrate into fragments in high-temperature air are 800, 800, >1000, and 600 °C, respectively. The anti-oxidation performance of the four TMC ceramics ranks as follows: TiC > TaC > NbC > ZrC. In comparison to the reported high-entropy carbide ceramics, the TiC ceramic in this study demonstrates superior anti-oxidation performance due to dense TiO 2 layer formation, characterized by significantly low oxidation rates and excellent structural stability.
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Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Ji Cheng,Zhang Chengcheng,Xu Zeya,Chen Yan,Gan Yanming,Zhou Minghui,Li Lan,Duan Qinying,Huang Tingting,Lin Jinxin
Bacterial infection is a major challenge that could threaten the patient’s life in repairing bone defects with implant materials. Developing functional scaffolds with an intelligent antibacterial function that can be used for bone repair is very important. We constructed a drug delivery (HA@TA-CS/SA) scaffold with curcumin-loaded dendritic mesoporous organic silica nanoparticles (DMON@Cur) via 3D printing for antibacterial bone repair. Inspired by the adhesion mechanism of mussels, the HA@TA-CS/SA scaffold of hydroxyapatite (HA) and chitosan (CS) is bridged by tannic acid (TA), which in turn binds sodium alginate (SA) using electrostatic interactions. The results showed that the HA@TA-CS/SA composite scaffold had better mechanical properties compared with recent literature data, reaching 68.09 MPa. It displayed excellent degradation and mineralization capabilities with strong biocompatibility in vitro. Furthermore, the antibacterial test results indicated that the curcumin-loaded scaffold inhibited S.aureus and E.coli with 99.99% and 96.56% effectiveness, respectively. These findings show that 3D printed curcumin-loaded HA@TA-CS/SA scaffold has considerable promise for bone tissue engineering.
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PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 8
·5208-5218
·
IF 3.9
Thi Viet Ha Luu,Ngoc Nhiem Dao,Hoang Ai Le Pham,Quang Bac Nguyen,Van Cuong Nguyen,Phuc Huu Dang
In this work, Ta-doped ZnO (Ta-ZnO) nanomaterials were synthesized by the hydrothermal method at different temperatures (110, 150, and 170 °C) for the photodegradation of methylene blue (MB) under visible light. Ta doping significantly affects the crystal defects, optical properties, and MB photocatalytic efficiency of ZnO materials. The optical absorption edge of Ta-ZnO 150 was redshifted compared to undoped ZnO, correlating to bandgap narrowing (EgTa–ZnO = 2.92 eV; EgZnO = 3.07 eV), implying that Ta doped ZnO is capable of absorbing visible light. Besides, Ta-doping was the reason for enhanced blue light emission in the photoluminescence spectrum, which is related to the oxygen defect V0O. It is also observed in the XPS spectra, where the percentage of oxygen in the oxygen-deficient regions (O531.5 eV) of Ta-ZnO150 is higher than that of ZnO150. It is an important factor in enhancing ZnO's photocatalytic efficiency. The MB degradation efficiency of Ta-doped ZnO reached the highest for Ta-ZnO 150 and was 2.5 times higher than ZnO under a halogen lamp (HL). Notably, the influence of hydrothermal temperature on the structural, morphological, and photoelectrochemical properties was discussed in detail. As a result, the optimal hydrothermal temperature for synthesizing the nanorod is 150 °C. Furthermore, photocatalytic experiments were also performed under simulated sunlight and natural sunlight. The nature of the photo-oxidative degradation of MB was also investigated.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Guoxu He,Menghui Wan,Zhihua Wang,Yanbao Zhao,Lei Sun
Due to its minute droplet size and stability, separation of the emulsion is a non-negligible challenge. In this paper, polyvinylidene fluoride (PVDF) nanofibrous membranes were prepared via the electrospinning method. The nanofibrous membranes were subsequently surface-modified by ZnO nanoparticles , tannic acid (TA), and n-dodecyl mercaptan (DT), in order to reduce the nanofiber membranes' surface energy while increasing their surface roughness . Thus, superhydrophobic and antibacterial nanofibrous membranes have been fabricated for oil-water emulsion separation. The as-fabricated nanofibrous membranes have a water contact angle of 156.5°. The product has a porosity of up to 73.3% due to the high porosity of the electrospinning nanofibrous membranes. In addition, the tensile strength of the PVDF@ZnO@TA@DT nanofibrous membrane is up to 69.25 MPa. Due to these properties, oil droplets can pass through the membrane during the oil-water separation, while the water phase is blocked by the membrane. This results in a good selective permeability of the membrane. As a result, the separation efficiency of the PVDF@ZnO@TA@DT nanofibrous membranes reaches more than 99%, and the flow flux is 1008.88 L·m −2 ·h −1 . At the same time, antimicrobial testing demonstrates that the nanofibrous membranes have a bacteriostatic rate of over 98%. Combined with these properties, PVDF@ZnO@TA@DT electrospun nanofibrous membranes have great potential for efficient emulsion separation and deep purification of wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
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IF 5.316
Kristina Maliutina,Jiajia Huang,Tong Su,Jianglong Yu,Liangdong Fan
This work introduces nanostructured carbon-based composite with enriched CNTs and microstructural defects from pomelo peel biomass precursors through successive chemical pretreatment, heteroatom N, S dual-doping and transition metal oxide loading (Ta 2 O y ) and its application for electrochemical oxygen reduction reaction (ORR) at room temperature. During the microwave pyrolysis process, volatile N, S-containing species from trithiocyanuric acid reactant were trapped and doped into carbonaceous biomass precursor to achieving the rich-defect porous nanotubes and abundant cavity structure. The effect of biomass pretreatment on the textural and structural properties of biochar and formed CNTs were systematically investigated. The impacts of single doping (N) using melamine and dual-doping (N, S) with trithiocyanuric acid on the structural and electrochemical characteristics of biochar were evaluated. An optimized PP-NS-600-Ta-900 electrocatalyst displayed remarkable ORR activity with a half-wave potential of 0.82 V (vs. RHE), a limiting current density of −5.75 mA cm −2 and an electron transfer number of 3.85. The results offer a useful archetypical template to design and construct reliable CNTs enriched biomass-derived biochar for possible electrochemical energy and storage application, illustrating its viability for utilization as ORR electrocatalyst in potential applications, like fuel cells and metal-air batteries.
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Materials Research Express
·
2020
·Vol. 7
·期 2
·025518
·
IF 1.929
Jiali Xue,Kuibao Zhang,Daimeng Chen,Jianjun Zeng,Baozhu Luo
Ta-doped Li7La3Zr2O12 (Ta-LLZO) solid electrolyte ceramics were synthesized by solid-state sintering, spark plasma sintering (SPS) and SPS plus heat-treatment (two-step method) using LiOH·H2O, La2O3, ZrO2 and Ta2O5 as the raw materials. The Ta-LLZO samples prepared from these three routes are all in cubic phase structure. However, the solid-state method results in Ta-LLZO samples with different particle sizes and porous morphology, while the samples prepared by SPS route contain fewer internal voids and smaller particle size. The two-step method not only retains the high compactness of SPS samples, but also the increment of grain size. The SEM results demonstrate that Ta-LLZO sintered by the two-step method shows optimal electrical properties. And the total ionic conductivity is 4.6 × 10−3 S cm−1 at 150 °C and the activation energy is calculated to be 0.38 eV.
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Materials Chemistry Frontiers
·
2024
·
IF 6
Qin Liu,Xia Zhao,Yuan Lin,Zhaohui Su
Vaccines are essential to prevent infectious diseases, but their thermal instability leads to their heavy reliance on cold-chain. Physical encapsulation is the simplest and most effective strategy to increase the thermostability of vaccines. However, traditional mineralized coatings are strictly dependent on the properties of substrate surface and synthesis conditions. Considering the instability and low surface charge density of vaccines, we developed a facile and robust approach for the protection of a single viral vaccine, tobacco mosaic virus (TMV), through tannic (TA) and FeIII metal-polyphenol networks, which significantly improved the thermostability of viral vaccine by strengthening its conformational rigidity. We found that the formed TA-FeIII nanoshell drastically enhanced the thermostability of the viral vaccine at high temperature of 100 °C and long-term storage at 37 °C. Additionally, the TA-FeIII nanoshell did not destroy the viral RNA, had excellent biocompatibility and was easily synthesized on the vaccine surface within seconds. This ease, low cost and substrate-independent approach makes TA-FeIII nanoshell as a potential candidate for vaccine applications.
研究领域:
病毒学
·
纳米技术
·
药学
·
生物医学工程
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EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Zuwu Tang,Jinbei Yang,Shi Li,Zhenzeng Wu,Ajoy Kanti Mondal
Conductive hydrogel endures as an ideal candidate for flexible electronic devices. However, conventional conductive hydrogels cannot incorporate superior sensitivity under low deformation, biocompatibility and underwater sensing into one system, which widely obstructs their applications in an aqueous environment. Herein, we designed a supramolecular conductive poly(vinyl alcohol) (PVA) and tannic acid (TA) based PVA/TA hydrogel. Due to the effective hydrogen bonding between PVA and TA, the hydrogel possesses some unique properties, including anti-swelling, stretching, self-healing and shape-memory. The PVA/TA supramolecular hydrogel demonstrates an excellent electrical performance where the conductivity and gauge factor (GF) are obtained at 5.5 × 10 -4 S/cm and 1.3 in dry and 5.0 × 10 -4 S/cm and 1.2 in wet conditions, respectively. The multifunctional hydrogel manifests excellent mechanical properties, where the maximum tensile strength of the hydrogels is 700 kPa at an elongation of 4700 %. Additionally, the hydrogel possesses excellent shape-memory and self-healable properties. Moreover, the hydrogel depicts outstanding biocompatibility, anti-swellable properties and exerts long-term stability underwater to detect human motions. Based on excellent anti-swelling and stability, high electrical conductivity and extraordinary stretching capability, the hydrogels may consider as promising candidates for applications in amphibious motion sensors.
研究领域:
材料科学
·
生物医学工程
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Pengcheng Deng,Nanjing Li,Ye Feng,Zhiqing Liu,Canhui Lu,Zehang Zhou
With the rapid advancement of electronic technology, the demand for wearable and portable electronic devices has significantly increased. MXene-based multifunctional textiles have attracted extensive attention from researchers due to their unique various functionalities, while the poor oxidation and structure stability limit their applications. In this study, a novel MXene/tannic acid-modified cellulose nanofibers (TACNF)-based multifunctional textile was prepared by screen-printing and post treatment. The abundant phenolic hydroxyl groups in TA effectively protect the MXene nanosheets from oxidation. The subsequent ZnCl2 cross-linking treatment leads to the metal coordination between Zn ions and TA molecules, which further improves the structure stability of the composite coating and endows the functional textile with enhanced antimicrobial activity against Escherichia coli and Staphylococcus aureus. The composite textile with a rationally designed electrically conductive structure demonstrates decent sensing ability toward tiny and large human motions, and its exceptional photo-/electro-thermal conversion ability also enables promising potential applications in thermal therapy and heat sterilization. This study provides new insights for the design and fabrication of smart healthcare textiles.
研究领域:
材料科学
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生物医学工程
·
纺织科学
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Small
·
2024
·
IF 13
Xiao Cen,Junjie Deng,Xuefeng Pan,Rufang Wei,Zhimao Huang,Rong Tang,Shengkai Lu,Rong Wang,Zhihe Zhao,Xinqi Huang
Current clinical strategies for the treatment of temporomandibular joint osteoarthritis (TMJOA) primarily target cartilage biology, overlooking the synergetic effect of various cells and inorganic components in shaping the arthritic microenvironment, thereby impeding the effectiveness of existing therapeutic options for TMJOA. Here, γ-Fe 2 O 3 @TA@ALN magnetic nanoparticles (γ-Fe 2 O 3 @TA@ALN MNPs) composed of γ-Fe 2 O 3 , tannic acid (TA), and alendronate sodium (ALN) are engineered to reconstruct the osteoarthritic microenvironment and mitigate TMJOA progression. γ-Fe 2 O 3 @TA@ALN MNPs can promote chondrocytes’ proliferation, facilitate chondrogenesis and anisotropic organization, enhance lubrication and reduce cartilage wear, and encourage cell movement. Magnetic-responsive γ-Fe 2 O 3 @TA@ALN MNPs also exhibit pH sensitivity, which undergoes decomposition within acidic environment to release ALN on demand. Under a 0.2 T static magnetic field, γ-Fe 2 O 3 @TA@ALN MNPs accelerate the synthesis of cartilage-specific proteins, and suppress catabolic-related genes expression and reactive oxygen species generation, affording additional protection to TMJ cartilage. In TMJOA mouse models, articular injection of γ-Fe 2 O 3 @TA@ALN MNPs effectively alleviates cartilage degeneration and subchondral bone loss in short and long terms, offering promising avenues for the development of therapeutic interventions for TMJOA.
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