Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 2
·937-952
·
IF 1.8
Zhang Xing,Wang Zhongze,Shu Sihao,Liu Shengnan,Wang Dandan,Chen Jixiang
ZrO 2 -supported Ni and Ni-Co alloy catalysts were synthesized by co-precipitation method and tested for the hydrogenation of phenol in aqueous phase. Cyclohexanol and cyclohexanone are dominatingly generated on all the catalysts, and the deoxygenation products are minor. The Ni-Co alloy gives higher phenol conversion and the total yield of cyclohexanol and cyclohexanone compared to the metallic Ni. This is attributed to high metal dispersion due to the formation of Ni-Co alloy and the synergetic effect of Ni and Co in the alloy. ZrO 2 -supported Ni-Co alloy with the Ni/Co atomic ratio of 1 and the metal mass loading of 15% possesses the best performance. The total yield of cyclohexanol and cyclohexanone reaches 91.3% with the cyclohexanol/cyclohexanone molar ratio of 2.79. The phase composition of ZrO 2 -supported Ni-Co alloy remains stable during recycling, while the slight sintering of ZrO 2 and Ni-Co alloy particles can account for the catalyst deactivation. It has also been found that the presence of water may facilitate the keto-enol tautomerization and stabilize the ketone intermediates, leading to higher cyclohexanone yield than using n-octane as solvent.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Junhua Ding,Jinggang Wang,Weihong Cao,Huajun Zheng,Zhenghong Guo,Zhengping Fang,Peng Chen,Juan Li
A bio-based phosphonate 4-(7-((diphenylphosphoryl)oxy)-5-hydroxy-4-oxo-4H-chromen-3-yl)phenyl diphenylphosphinate (DPGE) was synthesized using diphenylphosphinic chloride and genistein. DPGE was used to modify the flame retardancy of poly(ethylene 2,5-furandicarboxylate-co-ethylene terephthalate) (PEFT20) containing 20 mol % 2,5-furandicarboxylic acid. PEFT20 containing 8 wt % DPGE displays a UL-94 V0 rating and a limiting oxygen index of 29.8 vol %. The flame retardant mode is the comprehensive effects of melting-away, gas phase, and condensed phase induced by DPGE. In addition, triglycidyl isocyanurate (TGIC) was incorporated to regulate the mechanical performance of PEFT20/DPGE. The flexural and impact strengths of PEFT20/DPGE are modified greatly. The coupling reactions between PEFT20 and TGIC increase the molecular weight and mechanical properties of PEFT20 blends. But, TGIC counteracts the melting-away effect caused by DPGE. Therefore, too much TGIC causes the decrease in flame retardancy.
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ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Miaoben Wu,Enxing Yu,Kai Ye,Yuye Huang,Tiantian Ren,Mingjun Guo,Jun Yin,Kailei Xu,Peng Wei
Melanoma is a highly malignant tumor originating from melanocytes. The 5-year survival rate of primary melanoma is 98%, whereas the survival rate of metastatic melanoma is only 10%, which can be attributed to the insensitivity to existing treatments. Fibroblasts are the primary cells in the dermis that promote melanoma metastasis; however, the molecular mechanism underlying the fibroblast–melanoma interaction is yet to be completely understood. Herein, gelatin methacryloyl (GelMA) was used to construct a co-culture model for melanoma cells (A375) and fibroblasts. GelMA retains the good biological properties of collagen, which has been identified as the primary component of the melanoma tumor microenvironment. Fibroblasts were encapsulated in GelMA, whereas A375 cells were cultured on the GelMA surface, which realistically mimics the macrostructure of melanoma. A375 cells co-cultured with fibroblasts demonstrated a higher cellular proliferation rate, potentials of neoneurogenesis, overexpression of epithelial mesenchymal transition markers, and a faster migration rate compared with A375 cells cultured alone, which could be due to the cancer-associated fibroblast activation and the overexpression of transforming growth factor β1 and fibroblast growth factor-2 by fibroblasts. Overall, this study revealed the possible mechanisms of fibroblast–melanoma interaction and suggested that this co-culture model could be potentially further developed as a platform for screening chemotherapies in the future.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Chen Wang,Yanyu Li,Xinmeng Liu,Jing Fu,Jinglin Shen,Wei Qi
Gold nanoclusters (AuNCs) with ultrasmall size have attracted enormous interest due to their unique luminescent properties. Especially, luminescent AuNCs-based hydrogel with three-dimensional (3D) structures is valuable. Herein, hydrogel with effective enhancement of emission (QY increased from 0.45% to 14.6%) is reported through the co-assembly of AuNCs stabilized by 4,6-diamino-2-pyrimidinethiol (DPT) with citric acid (CA) and Al 3+ . With the formation of hydrogel, the microstructures of DPT-AuNCs changed from nanofibers into microdisks. X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra and Fourier transform infrared (FT-IR) reveal that CA is crucial for the emission enhancement of NCs and Al 3+ is benefit for the gelation of NCs. Furthermore, the obtained luminescent hydrogel could be used as a selective sensor for Fe 3+ /ascorbic acid (AA) through the “switch off/on” of luminescence and may find an application in information security. This study offers a convenient strategy for building AuNCs-based luminescent hydrogel through co-assembly method, and presents potential applications as functional materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Chuan Huang,Qinbin Zhang,Yichuan Zhang,Mingming Guo
Carbonized polymer dots (CPDs) are proposed as a novel room temperature phosphorescence (RTP) materials that widely used in optoelectronic devices, bioimaging, especially in the field of information encryption and anti-counterfeiting due to their unique optical properties . However, achieving RTP emission under matrix-free conditions requires reasonable structural design to prevent the quenching of triplet excitons , which is very challenging. Herein, we proposed a facile, rapid and effective strategy to prepare matrix-free nitrogen and phosphorus co-doped CPDs (named Arg-CPDs) via microwave assisted heating treatment of arginine (Arg) and phosphoric acid . The Arg-CPDs exhibit bright blue fluorescence in aqueous solution and yellow green RTP emission in solid state, and the RTP emission is visible to the naked eye for about 4 s after switching-off the UV lamp. The phosphorescence lifetime of Arg-CPDs was 149 ms and 667 ms in ambient conditions and low temperature (77 K), respectively, which shown that the typical phosphorescent properties. Moreover, potential applications of the Arg-CPDs in the fields of information protection and encryption are demonstrated. This study provides a facile strategy for the preparation of matrix-free CPDs-based RTP materials toward the information security and their successful application in information security.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yuan Shu,Tingkai Zhao,Weiyu Jia,Lei Yang,Xianghong Li,Guyue Feng,Yatao Li,Fa Luo
The combination of magnetic and dielectric materials followed by appropriate structure design is an effective approach to achieve high electromagnetic wave absorption properties. Here, crosslinked Co@CoO/reduced graphene oxide nanohybrids (CCRGO) were fabricated via a simple three-step method. The experimental results show that compared with previous works, the as-prepared CCRGO nanohybrids achieve higher electromagnetic wave absorption and broader effective bandwidth at a lower filler loading. The electromagnetic parameters and electromagnetic wave absorption performance could be apparently adjusted by controlling the adding content of graphene oxide (GO) and the reduction temperature. Among a series of samples, CCRGO3-650 nanohybrid yields the best electromagnetic wave absorption performance benefiting from the proper GO addition and reduction temperature. At a filler loading of 20 wt%, the maximal reflection loss reaches to −64.67 dB at a thickness of 2.53 mm and the effective bandwidth below −10 dB covers the whole X band at a thickness of 2.51 mm. The good performance may be ascribed to the advantages of the dielectric and magnetic component as well as the special crosslinked structure, which triggers a synergistic absorption mechanism including multiple reflection/scattering, interface polarization, dipole polarization, conductive loss, eddy current loss, exchange resonance in the electromagnetic wave dissipation process. The good electromagnetic wave absorption performance affirms the potential application of CCRGO nanohybrids in the field of stealth materials.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 8
·2370-2379
·
IF 7
Yanli Ruan,Hang Xu,Haikuo Lei,Wenjuan Xue,Tianyu Wang,Shidong Song,Yangyang Yu,Gui-Rong Zhang,Donghai Mei
Zn–air batteries (ZABs) have been widely studied due to their high theoretical energy density, low cost, and high safety. However, the lack of efficient bifunctional electrocatalysts toward both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) hinders their large-scale application. Herein, a dendritic NiS2@Co–N–C/CNF nanoarchitecture is proposed, which was fabricated by high-temperature carbonization of Co-MOFs and a subsequent simple hydrothermal composite method using NiS2 nanosheets. The catalyst is reasonably designed to integrate the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) active sites on the surface of carbon nanofibers. Through the synergy between NiS2 and Co–N–C/CNF and the unique branch–leaf porous structure, the catalyst showed excellent catalytic activity and stability. In an alkaline electrolyte, the OER overpotential of NiS2@Co–N–C/CNF is 300 mV at 10 mA cm−2. The ORR half-wave potential (E1/2) of NiS2@Co–N–C/CNF is 0.8 V. In addition, the superior catalytic activity of NiS2@Co–N–C/CNF could be transferred to a ZAB, which exhibits a maximum peak power density of 181 mW cm−2 along with an ultra-long cycling stability for 1050 and 600 h at discharging current densities of 5 and 10 mA cm−2, respectively. The performance is significantly higher than that of commercial precious metal Pt/C + IrO2 mixed catalysts. The peak power density of solid state ZAB (SSZAB) integrated with NiS2@Co–N–C/CNF is 76 mW cm−2, and it can still maintain excellent cycling stability under different bending states. More impressively, four in-series SSZABs (NiS2@Co–N–C/CNFs) can charge smartphones, indicating their potential feasibility in the field of wearable electronics.
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Molecular Catalysis
·
2023
·
IF 4.6
Muyao Li,Zhaolian Zhu,Shiyu Yuan,Liya Ji,Tianhe Zhao,Yan Gao,Hailing Wang
In order to improve the efficiency and reusability of gas diffusion electrodes for hydrogen peroxide (H 2 O 2 ) electrosynthesis, we modified the graphite felt with nitric acid and constructed nitrogen-oxygen co-doped graphite felt/polytetrafluoroethylene/gas diffusion electrodes. The graphite felts before and after nitric acid modification were characterized by SEM, contact angle measurements, FTIR, and XPS, which showed that nitric acid modification resulted in a significant increase of oxygen- and nitrogen-containing functional groups (such as carboxyl groups and pyridinic nitrogen), which could improve the H 2 O 2 yield and current efficiency. The H 2 O 2 yield of the electrode prepared under the optimized modification conditions can reach 42.2 mg·L −1 ·cm −2 , and the current efficiency can be maintained at about 80.0%. The electrode shows relatively stable performance of H 2 O 2 electrogeneration during 13 cycles, and has a promising application prospect.
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Shaohui Zhang,Suying Liu,Jingwen Huang,Haikun Zhou,Xuanzhi Liu,Pengfei Tan,Haoyun Chen,Yili Liang,Jun Pan
Developing highly efficient and stable platinum-based electrocatalyst for oxygen reduction reaction (ORR) is critical to expediting commercialization of fuel cells. Herein, several PtCu alloy nanocatalysts supported on N, P co-doped carbon (PtCu/NPC) were prepared by microbial-sorption and carbonization-reduction. Among them, PtCu/NPC-700 °C exhibits excellent catalytic performance for ORR with a mass activity of 0.895 A mg Pt −1 (@0.9 V) which is 8.29 folds of commercial Pt/C. Additionally, the ECSA and MA of PtCu/NPC-700 °C only decrease by 14.2% and 18.7% respectively, while Pt/C decreases by 35.2% and 52.8% after 10,000 cycles of ADT test. Moreover, the PtCu/NPC-700 °C catalyst emanates a maximum power density of 715 mW cm −2 and only 11.1% loss of maximum power density after 10,000 ADTs in single-cell test, indicating PtCu/NPC-700 °C also manifests higher activity and durability in actual single-cell operation than Pt/C. This research provides an easy and novel strategy for developing highly active and durable Pt-based alloy catalyst.
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Cancer Nanotechnology
·
2023
·Vol. 14
·期 1
·1-21
·
IF 5.7
Wang Hongsheng,Jin Xinmeng,Gao Yinghua,He Xin,Xu Yiming,Mu Haoran,Jiang Yafei,Wang Zhuoying,Yu Chen,Zhang Tao,Hua Yingqi,Cai Zhengdong,Xu Jing,Ma Xiaojun,Sun Wei
Background Tumor angiogenesis, immunosuppression, and progression are all closely correlated with the tumor microenvironment (TME). Immune evasion is supported by both M2 phenotype tumor-associated macrophages (TAMs) and vascular aberrations in the TME. TME reprogramming is a promising therapeutic approach for treating tumors. Anti-angiogenesis has the power to control the polarization of macrophages, prevent progression, and increase drug penetration. Additionally, polyamine blocking therapy can increase CD8 + T cell infiltration and decrease immunosuppressive cells. These results led to developing a potential therapeutic regimen that targets TAMs and angiogenesis to reprogram the osteosarcoma TME. Results For the targeted biomimetic co-delivery of regorafenib and alpha-difluoromethylornithine via the mannose receptor, which is overexpressed in both TAMs and osteosarcoma cells, mannosylated poly(lactide-co-glycolide)-polyethylene glycol nanoparticles (Man-NPs) were synthesized. The superior physiological properties and intratumoral accumulation of the Man-NPs efficiently promoted TAMs polarization and inhibited angiogenesis. Macrophage repolarization further activated immune cells, which contributed to remodeling the TME. Conclusion Overall, these findings suggested that using Man-NPs as an immunotherapeutic approach to treat osteosarcoma may be promising. Graphical Abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Abid Naeem,Yu Chengqun,Hetonghui,Zang Zhenzhong,Zhu Weifeng,Guan Yongmei
Gallic acid is an important phenolic compound with extensive applications in the food and pharmaceutical industries due to its health-promoting properties. However, due to its poor solubility and bioavailability, it is rapidly excreted from the body. Therefore, β-cyclodextrin/chitosan-based (polyvinyl alcohol- co -acrylic acid) interpenetrating controlled release hydrogels were developed to improve its dissolution and bioavailability. pH, polymer ratios, dynamic and equilibrium swelling, porosity, sol-gel, FTIR, XRD, TGA , DSC , SEM and structural parameters like an average molecular weight between crosslinks, solvent interaction parameters, and diffusion coefficient affecting release behavior were investigated. The highest swelling and release were observed at pH 7.4. Furthermore, hydrogels showed good antioxidant and antibacterial properties . Hydrogels improved the bioavailability of gallic acid in a pharmacokinetics study in rabbits. In vitro biodegradation showed that hydrogels were more stable in blank PBS than lysozyme and collagenase . Hydrogels were safe for rabbits (3500 mg/kg) without causing hematological or histopathological changes. The hydrogels showed good biocompatibility, and no adverse reactions were observed. Moreover, the developed hydrogels can be used to improve the bioavailability of various other drugs.
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POLYHEDRON
·
2023
·
IF 2.6
Lirong Zhang,Na Li,Gele Teri,Muge Shele,E. Namila,Sagala Bai,Menghe Baiyin
Two chalcogenidoantimonates Mn(en) 3 Sb 2 S 4 ( 1 ) and Co(en) 3 Sb 2 Se 4 ( 2 ) have been synthesized in solvothermal conditions. 1 and 2 are consist of transition metal complex cations and [Sb 2 Q 4 ] 2- (Q = S, Se) anions. They have band gaps of 2.20 eV and 2.25 eV, respectively, indicating that they can be used as semiconductor materials. The photocurrent responses of 1 and 2 were also investigated. Photocatalytic experiments showed that both 1 and 2 could degrade methylene blue (MB) upon visible light irradiation, reaching 47 % for 1 and 30 % for 2 , indicating that both compounds are good photocatalytic materials. Therefore, they present a promising potential for the photoelectric research chalcogenides.
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