JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Xiaojing Dong,Jintao Wang,Yue Hao,Yiqiang Sun,Xu Zhang,Bo Xu,Cuncheng Li
Exploring oxygen evolution reaction (OER) electrocatalysts over a universal pH range to simultaneously achieve enhanced activity, improved stability and reduced cost is a rewarding yet challenging endeavor. Considering the hydrophilicity and electronegativity disparity between Pb and Ru, herein, a Pb doped RuO 2 catalyst and its application as electrocatalyst for OER under universal pH conditions are studied. Due to the modified hydrophilicity and electronic structure, the Pb 0.1 Ru 0.9 O 2 only requires an overpotential of 207 mV to obtain a current density of 10 mA cm −2 in acidic environment, and overpotentials of 232 mV and 363 mV are required in alkaline and neutral environments, respectively. Moreover, extensive stability assessments conducted over a 24-h period reveal remarkable stability of the catalyst in diverse environments, encompassing acidic, alkaline, and neutral conditions. Additionally, the utilization of density functional theory (DFT) computations offers persuasive evidence that the inclusion of Pb within RuO 2 can significantly alter its electronic configuration, thereby promoting efficient electron transfer processes. This modulation of the electronic structure is crucial for enhancing the catalytic performance of the material. This research paves the way for innovative designs of highly efficient oxygen evolution reaction (OER) catalysts, featuring minimized use of precious metals, heightened catalytic prowess, and unparalleled stability across a broad pH range.
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Journal of Materials Research and Technology-JMR&T
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2024
·
IF 6.2
Bo Fang,Xinyue Zhang,Hongliang Liu,Fangchao Zhao,Yuzhu Li,Xiaotong Zeng,Zhenliang Feng,Wenzuo Li,Jie Liu
The pH-sensitive Tannic acid@ Benzotriazole@ Poly (hydroxypropyl acrylate-triethoxyvinylsilane -acrylic acid)/polyethyl enimide (TBP) gels loaded with corrosion inhibitors and the modified TBP composite coatings (TBP/EP coatings) were prepared innovatively. The TBP gels possessed excellent pH-sensitive properties and compatibility with epoxy coatings. Furthermore, the protective performance of the TBP/EP coatings was improved by the addition of TBP gels, which was attributed to the TBP gels filling the defects of the coatings after expansion of water absorption, and the released corrosion inhibitors formed the corrosion inhibitor films and the iron tannate films on the metal surface, respectively. Following the 181d immersion test, the TBP/EP coatings sustained an impedance value of 2.36 × 10 7 Ω cm 2 . In contrast, the impedance value of the epoxy coatings decreased to 6.86 × 10 4 Ω cm 2 . In comparison to epoxy coatings, the TBP/EP coatings demonstrated a notable enhancement in original adhesion and wet adhesion, with increases of 18.21% and 74.7%, respectively. In the end, the TBP/EP coatings corrosion inhibition functions were innovatively introduced.
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npj Materials Degradation
·
2024
·Vol. 8
·期 1
·1-11
·
IF 6.6
Xu Changyuan,Li Linyang,Hu Rong,Wu Huihua,Kong Lingnan,Zhong Nianbing,Wan Bo,Wu Lei,Lai Dong,He Yuanyuan,Liu Yang,Peng Xiaoling,Zhao Mingfu,Xie Quanhua
To monitor in situ the temperature, pH, and micro-strain change information of sandstone artifacts in the process of oxalic acid corrosion, the temperature, pH, and micro-strain fiber Bragg grating (FBG) sensors are developed. A theoretical model of the sensors is established. The surface morphology, material composition, pore structure, temperature, pH, and micro-strain of sandstone corroded by oxalic acid solutions of different concentrations are investigated. The experimental results show that the higher the concentration of oxalic acid, the stronger the corrosiveness of the sandstone. Ferrous oxalate and calcium oxalate produced by corrosion continuously precipitate from the inside of the rock, and the dual reaction of crystallization and dissolution occurs, reducing the proportion of fine pores in the rock pore suction and gravity. The oxalic acid solution is transported to the middle of the sandstone (3 cm) and undergoes the strongest chemical reaction with ore particles and debris, resulting in the maximum wavelength drift of the temperature, pH, and micro-strain sensors. The results of this study provide important support for analyzing the acid dissolution mechanism of stone cultural relics and the preventive protection of cultural relics.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Rui Ding,Zhang Yuan,Ke Wang,Pandi Peng,Jiaheng Liang,Kun Wang,Ke Lin,Hanxue Wu,Peng Li
Polyetheretherketone (PEEK) has been recognized for its immense potential in hard tissue repair applications due to its mechanical properties resembling those of natural bones. However, the inherent bioinertness of pristine PEEK results in insufficient osseointegration. Moreover, implant-associated infection (IAI) has become a serious threat in orthopedic surgery. These risks usually lead to implant loosening, delayed healing, and even the failure of implantation, hampering many clinical applications of PEEK. In this study, we present a facile strategy to endow PEEK implants with enhanced osseointegration and pH-responsive antibacterial activity. Briefly, pristine PEEK was first treated with mixed acids to obtain a porous structure (referred to as SNPEEK), and then the metal-phenolic networks (MPN) coating was prepared using layer-by-layer (LbL) assembly consisting of Sr 2+ and tannin acid (TA) (referred to as ST coating). The results demonstrated that the dual-functional PEEK displayed enhanced antibacterial activity in pH-responsive manner. At pH 7.4, the antibacterial ratios were 71.72% and 66.79% against Staphylococcus aureus (MSSA, ATCC 25923) and methicillin-resistant Staphylococcus aureus (MRSA, ATCC BAA-40), respectively. Remarkably, at pH 5.5, the antibacterial activities significantly increased, resulting in killing ratios of 99.98% and 100%, respectively. Furthermore, the dual-functional PEEK promoted osteogenic differentiation of pre-osteoblasts (MC3T3-E1) and migration of human umbilical vascular endothelial cells (HUVECs). In addition, the dual-functional PEEK demonstrated effective anti-infection ability and desirable new bone formation ability in vivo compared to both pristine PEEK and SNPEEK implants. Overall, this study provides a promising strategy to endow PEEK implants with effective osseointegration and anti-infective ability, representing a prospective solution to address current clinical challenges associated with PEEK implants.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Zhen Lin,Fan Nie,Zhiyun Zhang,Xiaotang Gong,Jie Zhang,Jing Xu,Yuanqiang Guo
Photothermal therapy and immunotherapy are emerging strategies for treating tumors. The combination of these two therapies can effectively leverage their advantages, thereby enhancing the therapeutic efficacy. Based on this premise, the natural polysaccharide was prepared from the edible Rosa roxburghii fruit and applied to coat gold nanorods (GNRs). The antitumor nanorods, designated as RRP-MPBA-GNRs, were developed to combine photothermal therapy and immunotherapy. This system employed 4-mercaptophenylboronic acid (MPBA) as the connecting unit. The hydroxy groups of RRP formed dynamic borate ester bonds with MPBA, and this conjugated bonds exhibited pH-responsive properties. The RRP-MPBA was immobilized on the surface of GNRs through sulfur–gold bonds, enhancing the stability and preserving the photothermal effects of GNRs. In vivo experiments have demonstrated that RRP-MPBA-GNRs reduced the number of cancer cells at the transplant site and inhibited metastasis. Further investigation revealed that the photothermal effects of RRP-MPBA-GNRs can increase reactive oxygen species (ROS) levels in cancer cells and induce apoptosis. RRP released from RRP-MPBA-GNRs can induce an antitumor immune response by promoting the maturation of dendritic cells and up-regulating the expression of surface marker molecules. The results suggested that RRP-MPBA-GNRs can effectively integrate photothermal therapy and immunotherapy for tumor treatment.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Yuqi Cao,Yingpei Liu,Chenchen Ding,Tingting Ma,Huimin Ye,Weiwei Zhong,Wei He
In this study, four cobalt ferrite@carbon nitride (CoFe 2 O 4 @g-C 3 N 4 ) composites were prepared by co-precipitation method to achieve chemo-photodynamic synergistic cancer therapy. The effect of the morphology of g-C 3 N 4 on the chemotherapy and photodynamic therapy of CoFe 2 O 4 @g-C 3 N 4 (CFO@g-C 3 N 4 ) was investigated in detail. CFO@PMCN with porous structures and CFO@CNT with a reticulated structure displayed high loading efficiencies of doxorubicin (DOX), exhibiting a pH-responsive release property and facilitating the delivery of DOX into cancer cells for chemotherapy. CFO@CNT possessed a higher photothermal performance for photothermal agents in cancer treatment compared with other CoFe 2 O 4 @g-C 3 N 4 composites. In addition, more reactive oxygen species (ROS) was generated in the assistance of CFO@CNT under the irradiation condition for photodynamic therapy (PDT) treatment. Based on the synergistic effect of chemotherapy and photodynamic therapy, the obtained CFO@CNT-DOX exhibited an excellent therapeutic effect and significant pH-responsive release characteristics confirmed by dimethylthiazol diphenyltetrazolium bromide (MTT) assay and dual staining fluorescence imaging analysis.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yanzhu Guo,Yunchuan Dai,Tao Zhang,Pengyu Hu,Tingting Chu,Haiqiang Shi,Haiming Li,Xing Wang,Zhiwei Wang,Qing-Shan Shi,Xiaobao Xie,Mingjie Chen
Lignin is the most abundant, but underutilization polyphenolic material on the earth. In this paper, an integrated platform for pH sensing and ions separation was prepared from lignin to make use of this abundant bioresource. Demethylation of enzymatic hydrolysis lignin was first achieved to mimic the catechol structure of dopamine. The demethylated lignin was then converted into carbon dots by a facile hydrothermal treatment. The as-prepared carbon dots emit green fluorescence with enhanced quantum yield, and exhibited pH-responsive color changes from yellow-green to blue. When incorporated into a chitosan aerogel , the pH-responsive property of the carbon dots was intact, whereas the adsorption capacity of the aerogel for Cu 2+ ions was noticeably improved, which was owed to the abundant oxygen containing functional groups and unique optical properties of the as-prepared carbon dots. This study provides a feasible approach to convert lignin into fluorescent nanomaterials for pH sensing and metal ions recovery from wastewater.
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ACS Omega
·
2024
·
IF 3.7
Yurong Leng,Yanmei Wu,Wenjing Xiao,Xiaoquan Su,Zhe Liu
Nanomedicine provides promising new methodologies for the treatment of tumors but still faces several limitations, including poor colloidal stability, uncontrollable drug release, and insufficient drug targeting. Herein, hyaluronic acid (HA) was used to modify the surface of mesoporous silica nanoparticles (MSNs) via a dynamic-covalent linker, phenylborate ester (PBAE), termed MA. The HA modifier provided enhanced colloidal stability to the hybrid nanoparticles. As expected, MA exhibited an improved biocompatibility and high potential for biomedical applications. Moreover, MA with a negatively charged surface effectively adsorbed the drug Doxorubicin (DOX) inside the carriers, ensuring minimal drug leakage. In an acidic and reactive oxygen species (ROS)-containing condition mimicking the tumor microenvironment, MA@DOX (MAD) continuously released its payloads, likely due to the cleavage of the pH/ROS-sensitive PBAE. Compared with free DOX, MAD had 2.2 times higher accessibility to tumor cells than free DOX. The favorable stability and cancer-selective drug release make this nanoformulation a promising platform for potent cancer treatment.
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PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 7
·995
·
IF 4.7
Song Zhang,Yunxu Ji,Yiwei He,Juan Dong,Haohang Li,Shirui Yu
Chitin and chitosan are important structural macromolecules for most fungi and marine crustaceans. The functions and application areas of the two molecules are also adjacent beyond their similar molecular structure, such as tissue engineering and food safety where solution systems are involved. However, the elasticities of chitin and chitosan in solution lack comparison at the molecular level. In this study, the single-molecule elasticities of chitin and chitosan in different solutions are investigated via atomic force microscope (AFM) based single-molecule spectroscopy (SMFS). The results manifest that the two macromolecules share the similar inherent elasticity in DOSM due to their same chain backbone. However, obvious elastic deviations can be observed in aqueous conditions. Especially, a lower pH value (acid environment) is helpful to increase the elasticity of both chitin and chitosan. On the contrary, the tendency of elastic variation of chitin and chitosan in a larger pH value (alkaline environment) shows obvious diversity, which is mainly determined by the side groups. This basic study may produce enlightenment for the design of intelligent chitin and chitosan food packaging and biomedical materials.
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PubMed
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Silicon
·
2024
·
IF 2.8
Huang Yunzhi,Li He,Colombo Paolo
3D printed silica ceramics have the advantages of low thermal expansion coefficient, high thermal stability, easy removal, etc., and are widely used in ceramic core manufacturing. However, in the sintering stage, silica often cracks due to shrinkage and phase transformation, which seriously affects the mechanical properties of the material. The impregnation of alumina sol can promote the formation of cristobalite phase in ceramics, and the mechanical properties of ceramics can be improved with appropriate amount of cristobalite. In this study, 3D printed silica ceramics were impregnated with alumina sol, and the effects of pH value and the concentration of alumina in the sol on the properties of the samples were investigated. When pH was 2.5, the mechanical properties of alumina sol impregnated samples reached a flexural strength of 24.98 ± 0.93 MPa, with a bulk density of 1.70 ± 0.01 g/cm 3 , and an open porosity of 25.82 ± 0.33%. When the ratio of alumina sol to silica sol was 3:1, the mechanical properties of alumina sol impregnated ceramics reached the maximum, with a flexural strength of 33.85 ± 1.69 MPa, a bulk density of 1.73 ± 0.01 g/cm 3 , and an open porosity of 24.02 ± 0.72%.
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Small
·
2024
·
IF 13
Qi-Xuan Ma,Li Xu,Yong Fan,Li Wang,Jia-Ning Xu,Jie Zhao,Xiao-Bo Chen
This article aims to develop CeO 2 nanocontainer-constructed coating with a synergistic self-healing and protective nature through a simple mechanical blending technique to manage metal corrosion. The proposed coating exhibits excellent corrosion resistance, which is primarily attributed to the combination of thermal-driven healing and active corrosion inhibition. Paraffin wax and 2-polybenzothiazole-loaded CeO 2 nanotubes (CeO 2 -MBT) are directly doped into epoxy coating to perform such a multifunctional role. CeO 2 nanocontainers and encapsulated corrosion inhibitor MBT can be released by pH triggers to achieve instant corrosion inhibition upon the surface of metal substrate. In addition, any physical defects in the coating are responsively repaired by heating incorporated paraffin wax to regain structural integrity and consequent barrier function. Corrosion protection efficiency remains sufficient even after ten cycles of damage and healing. Such a multiple-functional coating strategy provides an alternative pathway toward efficient and sustainable performance to tackle corrosion-related challenges of metal components in both short-term and long-term services.
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PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 35
·13530-13537
·
IF 5.101
Hongbin Zhang,Yourui Dong,Lei Wang,Guojie Wang,Jian Wu,Yudong Zheng,Huai Yang,Siquan Zhu
Hydrogels composed of hyperbranched poly(amine-ester) (HPAE) macromers with 36% of terminal CC groups were prepared as a pH-sensitive multi-drug release system with low swelling ratios (4.2% for the lowest one). Anticancer drugs including doxorubicin hydrochloride (Dox), 5-fluorouracil (5FU) and hydroxycamptothecin (HPT) were separately encapsulated in HPAE macromers before hydrogel formation and their release can be controlled by the conformational change of HPAE macromers under different pH conditions, fast when pH > 7 and slow when pH < 7. Furthermore, this system allows a combination release of multiple drugs and the release behavior of each drug was relatively independent with no interference from each other. This is different from traditional pH-sensitive hydrogel systems which control the drug release by a swelling-shrinking mechanism. HPAE hydrogels exhibited pH-controllable drug release properties with a relatively constant volume, because the swelling of hydrogel is limited due to the unique globe like structure of HPAE molecules. These findings show the great promise of HPAE hydrogels as a smart release system for controlled delivery of single or multiple drugs in combined therapy, and where a constant volume of the release system is required.
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