NANO
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2026
·
IF 1.3
Jia Wang,Lin Gao,Chuanyao Dong,Kan Zhang
To enhance the service performance of titanium alloys for demanding high-end equipment applications, an h-BN/SiC-Ti-MAO composite coating was fabricated on Ti6Al4V via one-step micro-arc oxidation (MAO). Optimizing the SiC additive concentration offers an effective way to improve the overall performance of the composite coating in mechanical, tribological, oxidation resistance and anti-corrosion properties. The research results show that the coating prepared with 4 g/L SiC yielded superior multifunctional properties. It possessed a dense microstructure with the lowest porosity (6.45%), high hardness (712 HV) and excellent adhesion. This coating maintained a low friction coefficient of approximately 0.20 from RT to 5 0 0 ∘ C and exhibited the best oxidation resistance at 6 0 0 ∘ C, with a parabolic rate constant ( K P ) of 3 . 3 3 × 1 0 − 4 . Electrochemical tests in 3.5 wt.% NaCl solution further confirmed its optimal anti-corrosion, showing the lowest corrosion current density ( 3 . 3 2 5 × 1 0 − 9 A/cm 2 ) . In contrast, insufficient SiC concentration results in limited performance improvement of the composite coating, whereas excessive concentration introduces microstructural defects, ultimately degrading the overall performance. This study demonstrates that optimized h-BN/SiC co-doping represents an effective strategy for developing high-performance MAO protective coatings on titanium alloys.
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TRIBOLOGY INTERNATIONAL
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2026
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IF 7.6
Heng An,Xianjun Hou,Kangjun Tan,Danjiao Zhao,Weiwei Guan
： Hexagonal boron nitride (h-BN) is an environmentally friendly lubricant that shows great potential in lubrication applications. However, there is currently a lack of research on the synergistic mechanisms of carboxylic acid-modified h-BN at different friction interfaces. In this study, the tribological mechanism of carboxylic acid-modified h-BN across various contact interfaces was investigated through experimental and molecular dynamics simulations. At the steel-steel contact, wear reductions relative to the base oil were 21.74% for unmodified h-BN, 58.94% for oleic acid (OA)-modified h-BN, and 55.80% for stearic acid (SA)-modified h-BN. At the alumina-steel contact, the corresponding wear reductions were 8.50%, 25.30%, and 23.54%, respectively. Additionally, at the alumina-steel contact, OA-modified and SA-modified h-BN reduced the coefficients of friction by 35.18% and 23.32%, respectively, compared with the base oil. Simulations revealed the adsorption mechanism of carboxylic acids: the carboxyl group anchors to the metal or oxide surfaces, while the alkyl end is compatible with the base oil. Among these, the conformational flexibility of the C=C bond in the OA molecule enables the synergistic anti-wear effect between OA and h-BN. This research outcome can guide the development of high-performance nano-lubricants suitable for multiple interfaces.
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CHINESE JOURNAL OF CATALYSIS
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2026
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IF 17.2
Junbo Tian,Peng Zheng,Shuang Deng,Yongjun Ji,Tengfei Zhang,Zhiyi Sun,Wenxing Chen,Yi-Chi Wang,Lin Gu,Dong Su,Guangwen Xu,Ziyi Zhong,Fabing Su
Understanding reconstructed interfacial sites is crucial for enhancing the catalytic conversion efficiency, as these sites can facilitate reactant adsorption, transformation, and desorption. Herein, we report an unconventional interfacial structure of Pt σ + –O–Ti 4+ –H δ + –oxygen vacancy (OV), in which atomic hydrogen binds to Ti 4+ sites via a charge-compensation mechanism involving subsurface OVs. This restructuring induced by hydrogen creates electron-rich Pt centers and interfacial oxygen, resulting in spatial elongation of the Pt–O and O–Ti bonds. This Pt σ + –O site, stabilized by –Ti 4+ –(H–OV), promotes the activation of CO adsorption/interfacially absorbed oxygen and interfacial lattice oxygen, effectively coupling the Langmuir-Hinshelwood and Mars-van Krevelen pathways. These sites facilitate the rapid CO 2 formation and desorption. Consequently, this system achieves complete CO conversion at 120 °C with an ultralow Pt loading of 0.17 wt% (even in the presence of 0.005% SO 2 and 10% vol H 2 O) and a 59-fold increase in turnover frequency compared to the control sample lacking this interfacial structure.
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MACROMOLECULAR BIOSCIENCE
·
2015
·Vol. 15
·期 10
·1411-1422
·
IF 3.851
Yan-Ling Luo,Mei Han,Feng Xu,Ya-Shao Chen,Yong-Qin Zhang
pH-Responsive H-type poly(methylacrylic acid- block -four hydroxyl terminated poly(butadiene-acrylobitrile)- block -poly(methylacrylic acid (PMAA 2 - b -HTPBN- b -PMAA 2 ) block copolymers were synthesized via atom transfer radical polymerization and the follow-up hydrolysis, and characterized by 1 H NMR, FT-IR and SEC . The block copolymers could self-assemble into nanoscale spherical core-shell micelle aggregates in aqueous solution, and the physicochemical properties depended on the system composition and pH media, with pH phase transition at 5.7–6.1. The copolymer micelle aggregates exhibited pH-triggered drug release and cytotoxicity, and could potentially be used as drug targeting release carriers.
研究领域:
材料科学
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药学
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生物医学工程
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CATALYSIS LETTERS
·
2026
·Vol. 156
·期 3
·80
·
IF 2.5
Li Xincheng,Huang Pengpeng,Fan Mingming,Zhang Pingbo
Isostearic acid, a bio-based and environmentally friendly chemical, has attracted considerable attention because of its high value as an oleic acid derivative. The synthesis of isostearic acid via oleic acid isomerization over commercial H-ZSM-5 zeolites is limited by low yield and acid value, mainly due to diffusion constraints. To address this issue, a hierarchical-pore H-ZSM-5 zeolite (Meso-5) was synthesized using Silicalite-1(S-1) as a seed crystal to enhance diffusion and catalytic performance. The catalyst was comprehensively characterized by XRD, SEM, BET, TGA, FT-IR, and Py-FTIR. Meso-5 efficiently catalyzed the isomerization of oleic acid, attributed to its abundant Brønsted and Lewis acid sites whose synergistic interaction significantly promoted the formation of branched-chain products. The catalyst delivered a selectivity of 87.3% with a 71.1% yield in the first run, and even after five reuse cycles it maintained 82.1% selectivity with a 55.6% yield. Evidently, the hierarchical pore structure of the catalyst significantly facilitated the diffusion of oleic acid molecules and their isomerized intermediates, thereby enhancing the overall catalytic activity. The resulting isostearic acid was purified via a simple recrystallization procedure to a purity of 83.4% and an acid value of 186.7 mg KOH/g, both meeting the standards of commercial isostearic acid. These findings provide a robust basis for further catalyst optimization and scale-up toward industrial isostearic acid production. Graphical A tandem catalytic route combining ZSM-5-driven isomerization with Ni/C-catalyzed hydrogenation enabled the efficient conversion of oleic acid to isostearic acid. The hierarchical H-ZSM-5 structure enhanced branched-chain formation, ensuring high selectivity and yield toward the desired product
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Jianchuan Liu,Yunbo Zhang,Yao Miao,Ying Yang,Ping Li
The mechanism of lithium ion-sieve adsorbing Li+ ions from brines is based on the Li+/H+ ion exchange, where Li+ ions in brines are adsorbed on ion-sieves to displace H+ ions, and the displaced H+ ions are released in brines in turn. If the released H+ ions are accumulated in brines, then brines become acidic, not conducive to Li+ ions adsorption on ion-sieves. Therefore, it is important to regulate the pH value in brines to be more than 7 during the lithium recovery from brines using ion-sieves. Instead of the addition of the traditional ammonia buffer solution, the alkaline anion exchange resins are used to regulate the pH value of brines in this work since the addition of ammonia buffer solution in brines would cause the secondary pollution in Salt Lake with a high ammonia nitrogen emission value. The alkaline anion exchange resins contain the amine functional groups to neutralize the released H + ions in brines that enhance the adsorption performance of lithium ion-sieves. Like ammonia buffer, the amine functional groups of alkaline resins without more free OH– ions in brine will avoid the precipitation of high content of magnesium in brines. Here, seven kinds of alkaline anion exchange resins are used to neutralize the released H+ ions during lithium recovery from brines using homemade granular titanium-type lithium ion-sieves (PVB-HTO ion-sieves). The process intensification for lithium recovery from brine by lithium ion-sieves with the addition of alkaline anion exchange resins is evaluated based on experimental results, and a green lithium recovery technology from brine with a high Mg/Li ratio will be developed.
研究领域:
化学工程
·
环境科学
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International Journal of Biological Sciences
·
2022
·
IF 10.75
Yu Dong,Guoyuan Zhu,Sheng-Fang Wang,Kristine A. Keon,John L. Rubinstein,Si-Xin Zeng,Shuang Zhang,Qiu-Ling Chen,Jing Fu,Min Li,Han-Ming Shen,Jin-Jian Lu,Xiu-Ping Chen,Jia-Hong Lu
Macroautophagy/autophagy is the process of self-digestion through the lysosomes; it disassembles unnecessary or dysfunctional long-lived proteins and damaged organelles for the recycling of biomacromolecules. Unfortunately, cancer cells can hijack this mechanism to survive under metabolic stress or develop drug resistance during chemotherapy. Increasing evidence indicates that the combination of autophagy inhibition and chemotherapy is a promising cancer treatment strategy. However, effective autophagy inhibitors with satisfied potency, bioavailability, and clearly-defined drug targets are still rare. Here, we report the identification of a potent autophagy inhibitor toosendanin which can effectively block autophagosome maturation, causing the accumulation of autophagy substrates in multiple cancer cells. Toosendanin did not inhibit the fusion process between autophagosome and lysosome but elevated lysosomal pH and impaired lysosomal enzymes activity. Using rat liver lysosome fraction and purified yeast V-ATPase, we found that toosendanin directly inhibited V-ATPase activity. By applying cellular thermal shift assay (CETSA), immunoprecipitation-coupled LC-MS/MS analysis, and biotin-toosendanin pull-down assay, we confirmed the direct binding between toosendanin and V-ATPase. Furthermore, toosendanin blocked chemotherapy-induced protective autophagy in cultured cancer cells and xenograft tumor tissues to significantly enhance anti-cancer activity. These results suggest that toosendanin has the potential to be developed into an anti-cancer drug by blocking chemotherapy-induced protective autophagy.
研究领域:
肿瘤学
·
药理学
·
细胞生物学
·
癌症研究
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Shiqiang Xu,Ziyu Song,Haotian Zhang,Zepeng Hou,Xian Zhou,Yingjie Yang,Xiaofeng Gao,Lili Lin,Siyu Yao
Subsurface metal promoted boron-based catalysts (M@BO x ) have demonstrated excellent activity and olefin selectivity in the oxidative dehydrogenation of propane (ODHP) through the efficient regulation of the special radical pathways. In this study, we discovered convincing subsurface metal dependent kinetic behaviors of the M@BO x catalysts which serve as powerful evidence to interpret the function of subsurface metal promoters in the ODHP reaction. The dependence of reaction rate with the partial pressure of propane and oxygen was determined and significant change of kinetic behaviors was resolved with the change of metal promoters, including the propane reaction order ranging from 1.93 to 2.44 and the turning O 2 pressure in the rate- P O2 profiles. Based on the kinetic equations derived from the reaction mechanism and the steady-state approximation, subsurface metal promoters modulate the contributions of surface and gas-phase reactions by influencing the initiation of reactive radicals both on the surface and in the gas phase. The reaction order of propane is positively correlated with the ratio of BO-H dissociation/regeneration rates ( k 1 / k 2 ), but high catalytic ODHP performance can only be realized at an appropriate k 1 / k 2 ratio. Similar trend is also observed regarding the partial pressure of oxygen. Therefore, the kinetic studies experimentally demonstrate the strong ability of subsurface metal in changing the radical initiation behaviors of supported boron oxide active species, pointing out that balancing the O-H bond dissociation and regeneration rates are highly important to achieve high performance in ODHP reaction.
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CATALYSIS TODAY
·
2022
·
IF 6.562
Xinyi Xing,Ying Guan,Liping Zhang,Xian Shi,Han Wu,Hui Gao,Siquan Xu
A catalytic system that is both efficient and recyclable is desirable for production 5-hydroxymethylfurfural (HMF) from glucose. In this study, the catalytic system composed of H 2 O (NaCl) -tetrahydrofuran (THF) biphasic system and H-β zeolite was found to have excellent performance for the glucose conversion into HMF. The physicochemical properties of the H-β zeolite catalyst, the dosage of the system components, and the reaction parameters were investigated in detail to optimize the production efficiency of HMF. Under optimal reaction conditions, an advanced level of 84% HMF yield was obtained from glucose. After the reaction was completed, all components of the catalytic system can be recovered, realizing no waste of reagents. Moreover, the recycled H-β(30) zeolite catalyst maintained considerable catalytic stability after five consecutive cycles. Therefore, it is reasonable to believe that the efficient, inexpensive, and recyclable H 2 O (NaCl) -THF catalytic system containing H-β(30) zeolite is capable of showing promising application potential in the future.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Kun Ge,Qiyue Wu,Yonghui Li,Ying Gu
In this work, a hexagonal boron nitride (h-BN)/AuAg nanoalloy hybrids (NAHs) was synthesized to fabricate h-BN/Au 1 Ag 3 membrane as a solid surface-enhanced Raman spectroscopy (SERS) substrate for sensitive SERS detection of melamine. The AuAg nanoalloys were in situ grown on h-BN by chemical reduction method, and the Au/Ag molar ratio was tuned to achieve optimal SERS performance. After the SERS performance of h-BN/AuAg NAHs with different Au/Ag ratios was analyzed, h-BN/Au 1 Ag 3 NAHs were chosen for SERS analysis. The h-BN/Au 1 Ag 3 membrane can be obtained through simple filtration of h-BN/Au 1 Ag 3 NAHs on chromatographic paper. As expected, the solid SERS substrates of h-BN/Au 1 Ag 3 membrane were uniform and demonstrated good selectivity, repeatability and reproducibility for SERS detection of melamine. The results demonstrate that h-BN/Au 1 Ag 3 membrane exhibited high SERS activity for 4-mercaptobenzoic acid (4-MBA) with limit of detection (LOD) at 1.0 ng L −1 , and its analytical enhancement factor (AEF) reached 3.6 × 10 8 . The possible enhancement mechanism, including electromagnetic mechanisms (EM) and chemical mechanisms (CM) were illustrated by finite-difference time-domain (FDTD) and density functional theory (DFT) simulations in detail, respectively. The concentration of melamine in the 0.05–5.0 mg L −1 range showed good linear relationship ( R 2 = 0.9940) with SERS intensity with LOD of 0.01 mg L −1 . Finally, the recoveries of melamine in liquid milk samples are 87.7–105.7% with relative standard deviations (RSDs) in range of 0.6–2.6%, providing precise safety evaluation of melamine in milk samples.
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DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Bing Liu,Jin Fan,Wenzhao Liu,Guannan Zhang,Zhaoyang Wu
The structural color of photonic crystals is usually whitish and has low saturation due to multiple incoherent scattering effects, limiting its application in practical visual observation. Herein, by controlling the calcination time of [email protected] 2 nanoparticles , we obtain hollow SiO 2 with different in situ generated carbon black contents and assemble them into photonic crystal inks (PCIs). PCIs have excellent saturation and high crystallinity due to the in-situ generated carbon black capable of absorbing incoherently scattered light without affecting particle assembly. PCIs are further converted into non-close-packed photonic crystal films with highly saturated structural colors by photopolymerization of resins. This photonic crystal film can be swollen by an ethanol-water mixture, resulting in structural color changes and shifts in reflection peaks. Moreover, the photonic crystal film can dynamically change from a dry opaque state to an ethanol-wetted translucent state. Such solvent-responsive photonic crystal films with highly saturated structural colors are expected to be used in alcohol sensors and color anti-counterfeiting labels.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2022
·
IF 5.141
Teng Du,Miao Cui,Yue Chao,Yuxuan Xiao,Ziqi Ren,Yonglin An,Changgong Meng
Photocatalytic application is obstructed by the self-aggregation and low specific surface area of nano materials. High dispersion of SmVO 4 nanoparticles on HMOR zeolite (HMOR) were prepared by template-free method. Not only the agglomeration of nanomaterials is restrained, but also the combination of low-cost zeolite and semiconductor to prepare high-performance photocatalyst is conducive to the rational utilization of resources. Sm(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 were used as precursors, and mixed with HMOR to prepare SmVO 4 /HMOR by precipitation method.. This method does not use any templates and surfactants, realizing the high dispersion of SmVO 4 nanoparticles on the surface of HMOR with the particle size are 17 ∼ 23 nm. The photocatalytic activity of SmVO 4 /HMOR was tested by degradation of rhodamine B (RhB). Compared with the monomer of SmVO 4 , the degradation rate of 29.81 wt% SmVO 4 /HMOR was increased from 33.12 % to 70.99 % under visible light irradiation for 2.5 h. The rate constant k (0.50 h −1 ) was boosted to 2.9 times as much as SmVO 4 monomer (0.17 h −1 ). When 3.7 wt% H 2 O 2 (30 %) was added into the photocatalytic system, the photocatalytic degradation rate could reach 93.26 % within 30 min. The synergistic effect of SmVO 4 and HMOR is critical on the improvement of the removal efficiency of RhB. SmVO 4 in the form of nanoparticles on the HMOR support has high photocatalytic activity. In addition, HMOR acted as electron acceptor to accelerate the transfer efficiency of photoelectrons, inhibiting the recombination of charges and improve the photocatalytic efficiency.
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