Nanomaterials
·
2024
·Vol. 14
·期 20
·1629
·
IF 4.4
Penghui Lei,Qing Chang,Mingkun Xiao,Chao Ye,Pan Qi,Fangjie Shi,Yuhua Hang,Qianwu Li,Qing Peng
A new type of SiCf/TiC-Ti3SiC2composite was prepared by the Spark Plasma Sintering (SPS) method in this work. The phase transformation and interface cracking of this composite under ion irradiation (single Xe, Xe + He, and Xe + He + H ions) and subsequent annealing were analyzed using transmission electron microscopy (TEM), mainly focusing on the interface regions. Xe ion irradiation resulted in the formation of high-density stacking faults in the TiC coatings and the complete amorphization of SiC fibers. The implanted H ions exacerbated interface coarsening. After annealing at 900 °C for 2 h, the interface in the Xe + He + H ion-irradiated samples was seriously damaged, resulting in the formation of large bubbles and cracks. This damage occurred because the H atoms reduced the surface free energy, thereby promoting the nucleation and growth of bubbles. Due to the absorption effect of the SiCf/TiC interface on defects, the SiC fiber areas near the interface recovered back to the initial nano-polycrystalline structure after annealing.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food & Function
·
2024
·
IF 5.1
Qingqing Lv,Aolin Yang,Ziyu Han,Ruirui Yu,Junying Zhu,Zhan Shi,Chenggang Yang,Shimiao Dai,Mengru Hao,Yuqing Chen,Ji-Chang Zhou
Low selenium levels are closely associated with reduced cognitive performance and lipid dysregulation, yet the mechanism of action remains unclear. The physiological function of selenium is primarily mediated by selenoproteins. Selenoprotein H (SELENOH), as one of the selenium-containing proteins, has an unelucidated role in regulating cognitive status and lipid metabolism. In this study, we established a Selenoh gene knockout (HKO) mouse model to investigate whether Selenoh mediates the impact of selenium on cognitive function. We found that HKO mice showed a significant decline in cognition compared with the wild-type (HWT) littermates, and were not affected by deficient or excessive selenium, while no differences in anxiety and depression behavior were observed. HKO mice showed reduced myelin basic protein expression in hippocampal oligodendrocytes, with decreased glycolipid levels and increased phospholipid and sphingolipid levels in the hippocampus. Furthermore, the high-fat diet (HFD) exerted no effect on cognition and limited impact on the gene profile in the hippocampus of HKO mice. Compared with those of HWT mice, the myelination pathways in the hippocampus of HKO mice were downregulated as revealed by RNA-seq, which was further confirmed by the reduced expression levels of myelin-related proteins. Finally, HKO increased the expression of hippocampal fatty acid transporter (FATP) 4, and HFD increased the FATP4 expression in HWT mice but not in HKO mice. In summary, our study demonstrated that HKO induced cognitive decline by impairing myelination in oligodendrocytes with disrupted hippocampal lipid metabolism, which provided a novel viewpoint on the selenoprotein-mediated neurodegenerative diseases of selenium.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Qihui Ding,Qian Shan,Qi Zhang,Mengda Chen,Ding Cai,Wei Wu
Hexagonal boron nitride (h-BN) with a large specific surface area and unique optoelectronic properties has good application prospects in many fields. The liquid phase exfoliation method is considered the most promising method for achieving controllable preparation of boron nitride nanosheets (BNNSs), but the low-cost, relatively environmentally friendly and efficient liquid phase exfoliation is still difficult to achieve. Choosing a suitable solvent system is the key to achieving efficient exfoliation. Deep eutectic solvents (DESs) have the advantages of simple synthesis, low cost, high thermal and chemical stability and strong biocompatibility and are expected to be green solvents for preparation of BNNSs . In this paper, it was found that the properties of DESs and its interaction with h-BN had a significant impact on the electrochemical exfoliation of h-BN. The intercalation effect of DES and the compatibility between DES and h-BN were the main factors affecting the yield, while the quality of BNNSs mainly depended on the decomposition and expansion effect of DES. This rule also can be applied to prepare highly conductive and hydrophilic two-dimensional material Ti-MXene. This research explores the structure–activity relationship between two-dimensional materials and DESs, and provides a theoretical basis for the environmentally friendly and efficient preparation of two-dimensional materials using DESs as exfoliation solvents.
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Xu Li,Wenlong Tan,Jinsong Fan,Kun Li
Although the past decade has witnessed a rapid development of oxidoreductase-mimicking nanozymes, the mimicry of cofactors that play key roles in mediating electron and proton transfer remains limited. This study explores how surface Au–H species conjugated to Au nanoparticles (NPs) that imitate formate dehydrogenase (FDH) can serve as cofactors, analogous to NADH in natural enzymes, offering diverse possibilities for FDH-mimicking Au nanozymes to mimic various enzymes. Once O2 is present, Au–H species assist Au NPs to complete the on-demand H2O2 generation for cascade reactions. Alternatively, when oxidizing organic molecules are introduced as substrates, Au–H species confer nitro reductase- and aldehyde reductase-like activities on Au NPs under anaerobic conditions. Furthermore, similar to the dehydrogenase–NADH complex, Au NPs possessing Au–H species are gifted with esterase-like activity for ester hydrolysis. By revealing that Au–H species are prosthetic groups for FDH-mimicking Au nanozymes, this work may inspire explorations into future self-generated cofactor mimics for nanozymes, thereby circumventing the need for exogenous cofactors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2025
·
IF 14.1
Jingting Jin,Wenzhi Li,Liqun Wang,Lulu Zhang,Xia Zhang
Direct and efficient methane oxidation to methanol is an appealing route for upgrading abundant methane resources while acquiring building blocks of clean fuels and chemicals. However, owing to its highly symmetrical nature imparted chemical stability and steric hindrance, the design of multi-ångstrom (<3.0 Å) spaced active species capable of activating its first C−H bond remains a fundamental challenge. Herein, Cu−Ni dual-atom Pair is constructed using defect engineering and a stepwise deposition method over indium oxide to precisely modulate the C−H polarization with the Cu atom showing affinity to H end and Ni anchoring the C side. The optimal CuNi/InNT achieves an oxygenates (CH 3 OH and CH 3 OOH) productivity of 106 mmol g cat h −1 , surpassing reported systems. Theoretical calculations validate the dominating role of interatomic distance for methane activation. Specifically, the dual-atom orbital coupling effect in the minimally spaced Cu−Ni pair up-shifts the overall d-band center, significantly enhancing its hybridization with C/O 2p. Further modification through macroscopic reactor design boosts CH 3 OH yield to 36818.84 µmol g cat h −1 with 79.37% selectivity in a 1000 mL semi-industrial prototype. This work provides a comprehensive explanation of the Cu−Ni synergy, bridging atomic-scale catalysis with reactor design, and establishes a common design principle for binary catalysts at the electron and orbital level.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
·
IF 15.7
Dong Anrui,Lin Gaoxin,Li Zhiheng,Wu Wen,Cao Xing,Li Wenlong,Wang Linqin,Zhao Yilong,Chen Dexin,Sun Licheng
The mechanical stability of the catalytic electrodes used for hydrogen evolution reactions (HER) is crucial for their industrial applications in anion exchange membrane water electrolysis (AEM-WE). This study develops a corrosion strategy to construct a self-supported electrocatalyst (Int-Ni/MoO 2 ) with high mechanical stability by anchoring the Ni/MoO 2 catalytic layer with a dense interlayer of MoO 2 nanoparticles. The Int-Ni/MoO 2 exhibits a strengthened homostructural interface between the interlayer and catalytic layer, preventing the detachment of the catalyst during ultrasonic treatment. The blade-shaped catalytic layer reduces bubble shock and potential fluctuations at high current densities up to −6000 mA cm −2 . As a result, the Int-Ni/MoO 2 electrode exhibits a low overpotential of 73.2 ± 14.2 mV and long-term stability for 6000 h at −1000 mA cm −2 in a 1 M KOH solution. The Int-Ni/MoO 2 assembled AEM-WE device demonstrates long-term stability at 1000 mA cm −2 for 1000 h with a very low degradation rate of 3.96 µV h −1 .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shaohui Xiong,Xingyi Ou,Qingquan Liu,Yiwen Li,Juntao Tang,Guipeng Yu,Chunyue Pan,Shibo Guo,Sitong Li,Menghan Yong
Polymers of intrinsic microporosity (PIM) have attracted considerable attention in the development of mixed matrix membranes (MMMs) for CO 2 separation. A prominent challenge lies in engineering the spacing of the polymer matrix chains while eliminating non-selective interfacial defects. In this study, a CO 2 -philic triazine-based porous polymer, featuring robust hydrogen bond donating groups, was employed to fabricate a series of interfacial defect-free PIM-1 based MMMs (denoted as PIM-1/CSU-1). The interfacial adhesion and compatibility have been greatly improved due to the strengthened hydrogen bond interaction, which was systematically validated through variable-temperature infrared spectroscopy. Additionally, the formation of hydrogen bonds allowed for the regulation of the polymer matrix chain spacing, making the chain distance loose. Remarkably, the resulting membrane exhibited a CO 2 permeability of 13,429 Barrer and CO 2 /N 2 selectivity of 33.1—246.6% and 70.2% higher than pristine PIM-1, respectively, surpassing the latest Jansen/McKeown upper bound established in 2019, but also significantly exceed the performance of previously reported MMMs for CO 2 separation. The strategy of mitigating interfacial defects through the formation of hydrogen bonds between fillers and the polymer matrix emerges as a viable and effective method for fabricating gas separation membranes with exceptional separation capabilities.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2022
·Vol. 12
·期 1
·1-12
·
IF 4.996
Zhu Xinhe,Fu Jingguo,Ma Dengqing,Ma Chunsheng,Fu Yunyang,Zhang Zhuokai
A composite ceramic coating containing h-BN particles was prepared on the ZL109 alloy via plasma electrolytic oxidation. The h-BN particles were modified by Polyethylene glycol to improve the dispersibility. The results revealed that the h-BN particles in the electrolyte were inertly incorporated into the coating. Meanwhile, the incorporation of h-BN particles can reduce the porosity and slightly increase the roughness of the composite ceramic coating. Furthermore, the growth rate of the coating and the conversion of γ-Al 2 O 3 and α-Al 2 O 3 were promoted by the incorporation of h-BN particles via the change of the current. In addition, due to the presence of h-BN particles, the composite ceramic coating had a lower friction coefficient and a lower wear rate under dry sliding condition.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Wei Li,Fei Wang,Xiao-shan Chu,Xiao-yun Liu,Yan-yan Dang
Water splitting by photocatalysis technique is regarded as an eco-friendly hydrogen production strategy. However, the poor photoresponsivity and automatic electron-hole recombination greatly restrict the HER performance of conventional semiconductor photocatalyst. Here, to utilize the stable electrochemical property of hexagonal phase boron nitride (h-BN) and improve its defect of wide bandgap ( E g ≈ 4.2 eV), reduced graphene oxide (rGO) was applied to construct three-dimensional (3D) porous h-BN/rGO hybrid accompanied by a carbon-doping strategy without template assistance, then a carbon-doped 3D porous h-BN/rGO (C-BNRG) hybrid with large BET surface area was successfully prepared. As the synergistic effect of h-BN/rGO heterointerface and carbon-doping, the improved photoresponsivity and electrochemical property were presented, and the resultant 3D porous C 0.4 -BNRG hybrid presented not only greatly enhanced HER activity (157.63 μmol·g −1 ·h −1 ) but excellent durability in pH = 8.5, which was prominently higher than pristine h-BN (～36.7 times), C-BN (～12.1 times) and 3D porous BNRG hybrid (～7.0 times). This study offers a template-free approach to develop non-metallic based 3D porous hybrid for outstanding HER performance.
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2018
·
IF 0
Xu Huang,Xuezhang Xiao,Xuancheng Wang,Zhendong Yao,Chuntao Wang,Xiulin Fan,Lixin Chen
Li-Mg-B-H system with the composition of 2LiBH 4 -MgH 2 is one of the most promising reversible hydrogen storage materials because of the extremely high hydrogen storage capacity (11.5 wt%). Yet, sluggish kinetics with high desorption temperature (~ 400 °C) hindered its practical applications. Herein, a highly efficient catalyst of nanoNi@g-C 3 N 4 , comprised of transition metal nanocatalyst and carbon-based nonmetal material, was designed and fabricated to dramatically reduce its initial hydrogen desorption temperature to as low as ~105 °C, and eliminate induction period between the two dehydrogenation steps of 2LiBH 4 -MgH 2 by reducing the activation energy for the dehydrogenation of LiBH 4 from 200±6 to 126±7 kJ/mol. Multiple postmortem analyses revealed that the in situ formed MgNi 3 B 2 NPs and the H + defects on g-C 3 N 4 play the key role in synergically enhancing the hydrogen reversible desorption/absorption kinetics at low temperature: 1) in situ formed MgNi 3 B 2 acts as nucleation center of MgB 2 and leads to an excellent catalytic effect to accelerate the dehydrogenation kinetics of 2LiBH 4 -MgH 2 ; 2) the H + defects on g-C 3 N 4 , will interact with the H – in LiBH 4 to trigger the release of H 2 at low temperature and destabilize LiBH 4 and MgH 2 to form Li 3 N and Mg 3 N 2 respectively for the high electronegativity of N: 3) these in situ formed intermediates of Li 3 N and Mg 3 N 2 will be readily rehydrogenated as highly reversible Mg(NH 2 ) 2 and LiH. This novel transition metal and g-C 3 N 4 catalytic composites could provide alternative insights into designing nanosized catalytic hydrogen storage system with low desorption temperature and high capacity for hydrogen-fueled applications.
✓ 已验证
DOI
CRYSTENGCOMM
·
2022
·Vol. 24
·期 46
·8060-8069
·
IF 3.756
Shu-Qin Qin,Wei Xu,Wen-Cai Ye,Ren-Wang Jiang
Guanidinium–naphthalenedisulfonic acid (GNPS) was used as a molecular catcher because (i) it contains a cavity and channel in the network; (ii) NH2+ can be used as a hydrogen bond donor, and SO3− can be used as a hydrogen bond acceptor; (iii) the co-planar naphthalene rings can form aromatic interactions with guest molecules. The liquid guests 1–8 [(−)-isopulegol (1), (−)-menthyl acetate (2), isoeugenol (3), 2,6-dimethylaniline (4), methyleugenol (5), 2,6-diisopropylaniline (6), methyl salicylate (7) and L(−)-carvone (8)] are successfully encapsulated in the cavity of GNPS and eight new crystals were obtained. Both aromatic and non-aromatic molecules form hydrogen bonds and C–H⋯π interactions with GNPS. Co-crystallization of 1–4 with GNPS led to stronger C–H⋯π interactions as compared to the previously reported GBPS. Furthermore, compounds 5–8 which were not co-crystallized with GBPS were found to be encapsulated in the cavity of GNPS. We found that the aromatic cavity of GNPS with hydrogen bonding and enhanced C–H⋯π interactions can be regarded as a useful tool for the structural determination of liquid molecules. Furthermore, the correct absolute configurations of 1, 2 and 8 can be assigned based on the small Flack parameters because of the presence of sulfur atoms in the host molecule GNPS.
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Wei Cai,Wenwen Guo,Ying Pan,Junling Wang,Xiaowei Mu,Xiaming Feng,Bihe Yuan,Bibo Wang,Yuan Hu
The potential prospect of hexagonal boron nitride (h-BN) in the fields of polymer composites is severely limited by undesirable exfoliation efficiency and chemical inertness. Herein, bio-based dopamine was employed toward exfoliating bulk h-BN with hydrogen bond action and imparting a highly-active surface. With assistance of polypodamine, SnO 2 nanoparticles were in-situ synthesized and strengthened the interfacial interaction between h-BN and epoxy (EP) matrix. The integrated function of metal oxide/h-BN toward flame retardant and smoke suppression of polymer materials was firstly studied and obtained, in term of reduced peak heat release rate (decreased by 41.1%), lower total heat release (decreased by 30.1%), and suppressed total smoke production (decreased by 21.6%). In addition, the mechanism for enhancements on flame retardant and smoke suppression of EP composites was systematically investigated. Such a design route simultaneously achieves the exfoliation and functionalization of h-BN, thus offering an active platform for further functionalization modification.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）