JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhisheng Zhang,Fang Zhu,Tingting Yang,Yongkun Wu,Yue Shi,Hongxiang Ou
An environmentally friendly intumescent flame retardant was developed by blending tannic acid (TA) and ammonium polyphosphate (APP), and intumescent flame-retardant polyurethane composites (IFR/TPU) were prepared via melt blending. The flame retardancy and mechanism of IFR/TPU were investigated through limiting oxygen index (LOI), cone calorimeter, and mechanical property tests. Results indicate that at a total exothermic flame retardant loading of 25 wt% and a TA:APP mass ratio of 1:1, IFR/TPU exhibits an LOI of 30.8%, achieving UL-94 V-0 rating, with a TG residue of 24.4%. The peak heat release rate (pHRR) decreased from 1102.46 kW/m 2 for pure thermoplastic polyurethane to 313.17 kW/m 2 . Furthermore, the incorporation of TA mitigated the adverse effects of flame retardants on the mechanical properties of TPU. SEM analysis of char residues revealed that TA promotes the formation of expanded carbon layers. This results in denser, more uniform char layers during combustion, enhancing both flame retardancy and smoke suppression. TA exhibits synergistic flame retardancy with APP. This approach maintains the inherent properties of polyurethane while delivering excellent flame retardancy, offering a novel design strategy for developing next-generation bio-based flame retardants.
研究领域:
材料科学
·
高分子化学
·
消防安全工程
·
可持续材料
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 7
·1940-1948
·
IF 2.161
Li Jia-Xin,Chen Yu-Hong,Bai Zhang-Jun,Zhao Bao-Jun,Jiang Liang,Wu Lan-Er
Ta–W alloys have unique properties but their applications at high temperatures are restricted due to their poor oxidation resistances. The addition of Al and Ti decreases the oxidation rate of the alloy, as Al-contained protective oxide layer could be formed. In this study, ternary and quaternary Ta–W alloys containing Al and Ti were prepared by hot press sintering. The microstructures and oxidation behaviors of the alloys were studied at 1173 K. The results show that the oxidation kinetics of all alloys follows a parabolic law at short oxidation periods. After cyclic oxidation, the kinetics of quaternary alloys still obeys the parabolic law but that of ternary alloy has been changed into linear law kinetics after 8-h oxidation. For ternary alloy, an outer layer with dense and continuous alumina was formed during the initial stage, and phase transformation caused the oxides to peel off. By comparison, the quaternary alloys depicted continuously solid solution of the oxides layer. Overall, Al and Ti played key roles in oxidation degree and affected the oxidation kinetics of ternary and quaternary alloys.
研究领域:
材料科学
·
金属学
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产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Manting Wang,Rongrong Fan,Qingjian Yu,Jie-Xin Wang,Yuan Le,Jian-Feng Chen
Controlled pesticide delivery systems offer many distinctive advantages over conventional pesticide formulations. In this work, degradable poly(N-isopropylacrylamide) (PNIPAM)–tannic acid (TA) microgels and multifunctional PDA@PNIPAM-TA nanocomposites were prepared in a high-gravity rotating packed bed reactor (RPB) for smart pesticide delivery and release. The as-prepared microgels and nanocomposites showed reversible temperature-dependent swelling/deswelling behavior and irreversible pH-induced degradation. A dynamic contact angle test suggested that the introduction of TA and PDA into the PNIPAM matrix could enhance foliar adhesion and deposition efficiency. The nanocomposites were further used for the encapsulation and delivery of imidacloprid (IMI) to protect it from rapid photolysis and improve its pest-control efficiency. Their thermoresponsive behavior as well as pesticide loading capacity could be tuned by tailoring the PNIPAM-TA shell thickness, which could be varied by the NIPAM amount. The release rate of IMI from the core/shell nanocomposites was positively correlated with environmental temperature and near-infrared (NIR) light, which was adaptive to the positive temperature-dependent toxicity correlation of IMI and the increasing trend of pests under high temperature. The cumulative release of IMI was 23.5% at 25 °C, while it was 81.2% at 40 °C after 24 h of incubation, and the release rate was greatly enhanced under NIR irradiation. The results indicated that the facile control of pesticide release could be realized by regulating environmental conditions. This work also provides an idea for using high-gravity technology to conveniently construct a smart, effective, and environmentally friendly pesticide delivery system for sustainable crop protection.
研究领域:
材料科学
·
化学工程
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农业科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Mengbin Gu,Ge Yuxi,Gang Yu,Jun Huang
Ultraviolet-activated persulfate (UV/PS) represents a promising advanced oxidation process (AOP) for the elimination of toxic and bio-refractory organic pollutants in wastewater due to the advantages of SO 4 • - . C7 HFPO-TA, one of the latest alternatives to PFOA in fluoropolymers production, with a unique structural fragment (CF 3 O-CF(CF 3 )-) that has been frequently identified in effluents, surface waters, and sediments in proximity to fluorochemical industrial zone. In this study, we evaluated the degradation of C7 HFPO-TA and co-existing PFHxA in AOPs, mainly focusing on the molecular structure effect on the chemical affinity with different reactive species (RSs). The results showed that >99.9% C7 HFPO-TA and PFHxA could be decomposed after 480 min in UV/PS, significantly outperforming UV/H 2 O 2 (<10%), as the result of the synergistic effect of radical/non-radical (SO 4 • - /HSO 4 •, O 2 • - , HO•, 1 O 2 ) and chain reactions. The degradation mechanism of C7 HFPO-TA was primarily governed by the DHEH mechanism, which facilitated radical chain reactions and resulted in the formation of a new perfluoroalkyl ester intermediate (C 6 F 12 O 3 ), as optimized by Transition State theory. The degradation of five HFPO and three PFCA was highly dependent on their molecular structures. Degradation kinetics and DFT calculations demonstrated the longer branched fluorocarbon chain could diminish the steric hindrance of α-CF 3 in HFPO and made the electron distribution more flexible for the reaction with the RSs. The comprehensive analysis of degradation kinetics, theoretical calculations and intermediates analysis elucidated the transformation mechanisms of C7 HFPO-TA and PFHxA in UV/PS.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Lingrui Zhang,Li Zhao,Yating Tan,Xiaobo Gong,Meng Zhu,Yong Liu,Yucheng Liu
Oil/water separation has become a global concern due to the increasing discharge of multi-component harmful oily wastewater. Super wetting membranes have been shown to be an effective material for oil/water separation. Ultra-high flux stainless-steel meshes (SSM) with superhydrophilicity and underwater superoleophobicity were fabricated by tannic acid (TA) modified ZIF-8 nanoparticles (TZIF-8) and two-dimensional MXene materials for oil/water separation. The TZIF-8 increased the interlayer space of MXene, enhancing the flux permeation (69,093 L m −2 h −1 ) and rejection of the composite membrane (TZIF-8@MXene/SSM). The TZIF-8@MXene/SSM membrane showed an underwater oil contact angle of 154.2°. The membrane maintained underwater superoleophobic after stability and durability tests, including various pH solutions, organic solvents, reusability, etc. In addition, the oil/water separation efficiency of TZIF-8@MXene/SSM membranes was higher than 99% after treatment in harsh conditions and recycling. The outstanding anti-fouling, stability, durability, and recyclability properties of TZIF-8@MXene/SSM membrane highlight the remarkable potential of membranes for complex oil/water separation process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Rui Luo,Yuting Huang,Min Wang,Tong Yu,Kexin Tai,Lin Hu,Xiankun Wu
Advanced oxidation processes based on persulfate (PS-AOPs) have emerged as effective strategies for environmental remediation, with cobalt-based oxides serving as prominent catalysts for peroxymonosulfate (PMS) activation. In this study, we developed a highly active Co 3 O 4 /Al 2 O 3 catalyst (Co/AA) featuring ultrafine nanoparticles, synthesized via a facile approach using tannic acid (TA) as a coordinating agent and activated alumina as a robust support. Co/AA-0.1, as the representative catalyst, was characterized and exhibited outstanding performance in degrading rhodamine B (RB) via PMS activation. Our findings highlight TA's critical role in reducing Co 3 O 4 nanoparticle size, thereby increasing the availability of active sites. The degradation mechanism was elucidated through reactive oxygen species (ROS) quenching experiments and electron paramagnetic resonance (EPR) analysis, revealing that sulfate radicals (SO 4 •− ) are the dominant ROS. The high activity of Co/AA-0.1 is confirmed by analyzing X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area and O 2 -temperature programmed desorption data of the samples. We also investigate the effects of various factors, such as anions, reaction temperatures, and PMS dosage, on RB degradation. Higher temperatures for treating the catalyst are found to reduce activity but improve stability. Notably, the catalyst synthesized through EDTA-assisted synthesis showed balanced activity and stability. Furthermore, the versatility of our synthesis method was demonstrated by successfully applying it to other supports, such as SiO 2 and TiO 2 , offering the development of more efficient and stable catalysts for environmental applications.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Hongxin Luo,Xin Li,Nanqi Shi,Feng Guo,Han Yin,Zhike Li,Haiyan Li
In this work, self-reporting corrosion inhibition coatings with long-term corrosion protection was prepared by different process means. The two-dimensional (2D) materials ZrP-NH 2 and Tannin@SiO 2 (TA@SiO 2 ) microcapsules were introduced into the epoxy resin (EP) coatings, and the Layered EP coatings (TA@SiO 2 layer coatings and ZrP-NH 2 layer coatings) and the Mixed EP coatings were prepared by layered spraying and mix spraying, respectively. In the pre-corrosion stage, the excellent barrier performance of the ZrP-NH 2 layer coating hinders the diffusion of corrosive media. In the later stages of corrosion, the TA@SiO 2 microcapsules in the TA@SiO 2 layer coating releases TA, which forms a TA-Fe 3+ passivation film with the metal substrate and confers the coating with a blue-violet self-reporting function. Furthermore, the synergistic corrosion inhibition mechanism of TA@SiO 2 layer coatings was investigated by DFT theoretical calculations and experiment. Meanwhile, the Layered EP coatings provide the triple functions of excellent physical barrier action, corrosion inhibition and self-reporting under high temperature and high salt conditions.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2024
·
IF 4.8
Wenya Li,Yongsheng Liu,Jingxin Li,Yejie Cao
(Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 -SiC ceramics with an open porosity of only 0.49 % were successfully fabricated in this work by the reactive melt infiltration (RMI) method. Air plasma flame ablation behavior of (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 -SiC ceramics under 2300 °C temperature exhibited excellent resistance with mass and linear ablation rates of 3.66 mg/s and 0.88 μm/s, respectively. During ablation, the transition from continuous melting sublimation of Si and oxidation of SiC to oxidation of (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 occurred. The uphill diffusion of Ti atoms transited (Ti,Zr,Hf,Nb,Ta)O x to Ti(Nb x Ta 1-x ) 2 O 7 while Zr 0.5 Hf 0.5 O 2 continuously precipitated. A multicomponent oxide layer of (Ti,Zr,Hf,Nb,Ta)O x along with (Zr,Hf) 6 Ta 2 O 17 , (Hf,Zr)(TiO 4 ) 2 , and (Zr,Hf) x (Ti,Ta) 1-x O embedded in SiO 2 melt was eventually formed on the ceramic surface. This oxide layer was spread above the high melting point Zr 0.5 Hf 0.5 O 2 , Ti(Nb x Ta 1-x ) 2 O, and low oxygen content (Ti,Zr,Hf,Nb,Ta)O x to form a stable, dense, and high viscosity protective layer.
研究领域:
材料科学
·
航空航天材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2025
·
IF 5.6
Rui Huang,Hangyu Luo,Zhenbang Meng,Weirui Chen,Ri Chen,Qi He,Yuxi Guo,Lihua Zhou,Wenxia Wang,Qiaoshan Chen
The escalating threat of antibiotic-resistant bacterial infections necessitates innovative antimicrobial strategies beyond conventional approaches. Micro/nanomotors, leveraging self-propulsion and intrinsic antibacterial capabilities, offer a promising alternative. However, existing bactericidal micromotors face a fundamental trade-off between motility and bacterial capture capacity. To address this challenge, we synthesized rough-surfaced, virus-like Cu 7 S 4 /vSiO 2 /TA micromotors for localized bacterial capture and synergistic photothermal therapy. This multifunctional platform integrates: i ) Cu 7 S 4 nanoparticles as a high-efficiency NIR photothermal core (λ = 1064 nm), ii ) virus-like silica (vSiO 2 ) shells engineered with nanospike structures to mimic viral morphology, enabling multivalent, affinity-driven bacterial capture, iii ) Tannic acid (TA) coatings providing robust adhesion functionality and enhanced biocompatibility. Attributed to these intriguing properties, the micromotors exploit NIR-II light-fueled self-propulsion to actively seek and accumulate at infection sites. The vSiO 2 /TA surface facilitates targeted bacterial adhesion through synergistic physicochemical interactions, effectively "trapping" pathogens locally. Subsequent NIR irradiation triggers the Cu 7 S 4 core to generate rapid, localized hyperthermia (>50 °C), achieving synergistic bacterial eradication while minimizing off-target damage. We demonstrate the micromotors’ efficacy against diverse bacterial targets (e.g., Gram-positive/Gram-negative strains), highlighting their potential as a targeted, antibiotic-free strategy for treating localized bacterial infections. We believe that this work pioneers the convergence of biomimetic capture (virus-like topology), autonomous motion, and photothermal conversion within a single platform.
研究领域:
纳米医学
·
抗菌治疗
·
生物医学工程
·
光热治疗
·
微纳机器人
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jinming Huang,Yihua Yue,Xukang Zhang,Ju Zhou,Wenlei Jia,Wenhan Qi,Mingwei Li,Shiqi Li,Jiao Han,Yiming Zeng
This study investigates the synergistic enhancement of tantalum (Ta) doping and nitrogen (N 2 ) annealing on the dielectric properties of Sr 0.985 Lu 0.01 Ti 1-x Ta x O 3 (x = 0, 0.01, 0.015, and 0.02) ceramics. X-ray diffraction (XRD) confirmed the presence of the primary SrTiO 3 phase along with a minor secondary phase of Lu 2 Ti 2 O 7 . XPS, Raman, and UV-vis spectroscopy analyses revealed the formation of defect dipoles including [Ti 3+ - , [ - ], and [Ti 3+ - - Ti 3+ ], induced by Ta doping and N 2 annealing. The combined effects of electron-pinned defect dipole (EPDD, obtained from defect dipoles), along with interface polarization (induced by phase boundaries), resulting in ultra-low dielectric loss and excellent thermal stability. Notably, the Sr 0.985 Lu 0.01 Ti 0.985 Ta 0.015 O 3 ceramic, which was sintered in air and subsequently annealed in N 2 at 1325 o C, exhibited a high permittivity (εᵣ ∼ 162,000), ultra-low dielectric loss (tanδ ∼ 0.013), and excellent thermal stability (-55 o C to 125 o C, Δε′ / ε′ 25 °C ≤ ± 15%) at 1 kHz. This study can provide a way to improve the properties of colossal permittivity materials.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Chemical Engineering
·
2017
·Vol. 2017
·期 1
·9136528
·
IF 0
Fei Chang,Rui Wang,Quan Zhou,Hu Pan,Heng Zhang
Mesoporous solid acids Ta 3 W 7 and Nb 3 W 7 were prepared from TaCl 5 and NbCl 5 with WCl 6 in the presence of stearic acid (SA) via a sol-gel method, respectively. For comparison, mesoporous Ta 3 W 7 -P123 mixed oxides and mesoporous Nb 3 W 7 -P123 mixed oxides were synthesized in the same way. The catalysts were characterized through TGA, XRD, SEM, TEM, BET, and NH 3 -TPD. Experimental results showed that Ta 3 W 7 -SA and Nb 3 W 7 -SA exhibited several advantages such as higher activity, shorter preparation period, lower cost, stronger acid sites, and higher surface area, which had potential to be used as mesoporous heterogeneous catalysts in biodiesel production.
研究领域:
材料化学
·
催化化学
·
能源化学
·
表面科学
·
多相催化
✓ 已验证
DOI
ACS Applied Energy Materials
·
2021
·
IF 6.024
Qin Wang,Jiamian Huang,Chenyang Wang,Pengfei Luo,Zhili Li,Rongtao Liu,Qunaying Ma,Jun Luo
NbCoSn-based half-Heusler alloys are promising n-type high-temperature thermoelectric materials, but their relatively high thermal conductivities prevent the further improvement in thermoelectric properties. In this work, an effective way to reduce the lattice thermal conductivity without degradation of electrical transport properties via the isoelectronic substitution of Ta for Nb in NbCoSn-based alloys has been demonstrated. The synthesis and thermoelectric properties of Nb1–xTaxCoSn0.9Sb0.1 (x = 0, 0.05, 0.1, 0.15, 0.2, and 0.25) solid solutions are reported. The large mass fluctuation and chemical bond softening caused by Ta alloying significantly suppress the lattice thermal conductivity. Meanwhile, the Ta content has little effect on the carrier mobility due to the close atomic size and similar chemical nature between Ta and Nb. Benefiting from the significant reduction of lattice thermal conductivity and preservation of electrical transport performance after Ta alloying, a ZT value of ∼0.7 is achieved in Nb0.75Ta0.25CoSn0.9Sb0.1 at 973 K, which is about 32% higher than that of a NbCoSn0.9Sb0.1 matrix. This work demonstrates a valid approach to enhance the thermoelectric performances of half-Heusler alloys.
研究领域:
材料科学
·
热电学
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）