ACS Omega
·
2026
·
IF 5.2
Lei Cao,Dan Xu,Muyun Han,Huicun Zhao,Yonghao Han
Dielectric properties are one of the important attributes of materials, whose enhancement is of significant importance for practical applications. In this work, the dielectric properties of HfO2 were studied under high pressure by combining in situ Raman scattering, alternating-current (AC) impedance spectroscopy measurements, and differential charge density calculations. It was found that HfO2 undergoes pressure-induced irreversible phase transitions from P21/c to Pbca and then to the Pnma structure, and its high-pressure Pnma structure can be retained at atmospheric pressure. AC impedance spectroscopy measurements revealed that the relative permittivity of HfO2 has not only been increased by approximately 3 times after a cycle of compression and decompression but also the dielectric loss factor has been dramatically decreased, indicating that an obvious enhancement of dielectric performance has been obtained. Differential charge density calculations suggested that a large number of electrons transferred from Hf4+ cations to O2– anions could be the physical origin of the increase of electric dipole moments in HfO2 and the enhancement of dielectric properties.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Jintao Tong,Shihao Zang,Xiangyu Dou,Xingyue Chen,Chen Chen,Zhe Xu,Cheng Ma,Jianbin Huang
In colloidal mixtures, different particle types coexist in the same suspension environment yet exhibit intrinsically distinct surface chemistries. Here we present surface-dictated sorting rules that enable selective assembly among mixed colloids. Using seven types of particles of equal size (∼2 μm) representing common families of negatively charged stable colloids, including inorganic spheres bearing native surface hydroxyls groups (M–OH, e.g. SiO 2 , TiO 2 ) or grafted carboxyl groups, organic polymer particles synthesized by emulsion polymerization (sulfonated PS and PMMA, carboxylated PS), and an organosilane-derived colloid with silanol surface (TPM), we identify three general strategies: (1) pH and solvent dielectric tuning, suppresses the dissociation of weakly acidic surface groups, driving particles with near-neutral M–OH or –COOH sites to clusterize; (2) Small molecules with multiple hydrogen-bonding sites (i.e., urea), reorganize interfacial hydrogen-bond networks, selectively destabilizing the surfaces of hydroxyl-rich inorganic particles; (3) Depletion-driven assembly with Pluronic surfactants. Upon selective adsorption onto hydrophobic particles (e.g., polystyrene), Pluronic copolymers form a stable surface brush layer, increasing the effective radius of the particles. This expanded depletion zone creates greater overlap as particles approach, resulting in enhanced depletion attraction. When combined with disparities in intrinsic surface potential, this brush-mediated interaction yields distinct overall potentials between hydrophobic and hydrophilic particles, thereby driving the preferential assembly of the hydrophobic ones. Applying this strategy to SiO 2 /Pt Janus particles further induces neutral charged Pt-facet clustering under depletion, yielding oriented clusters and chain-like assemblies.
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高影响因子
Nature Communications
·
2026
·Vol. 17
·期 1
·9522
·
IF 18.1
Zhou Junhong,Han Xu,Huang Haibin,Huang Taotao,Wang Yaowen,Woodfield Brian F.,Li Liping,Li Guangshe
Photomagnetism enables optical control of spin order for engineering non-equilibrium phases, yet studies remain largely confined to ferromagnetic systems. Here, we introduce the alterlattice, an emergent structural motif realized in the cation- and anion-deficient perovskite oxide La 0.4 Ca 0.4 TiO 3–δ . The alterlattice is a three-dimensional alternately patterned superstructural network arising from structural competition, in which average lattice is described by Ibmm symmetry while local superstructure relaxes toward Cmmm symmetry. Within this motif, photo-induced antiferromagnetic correlations develop below 19 K. Under 473 nm illumination, the susceptibility of the alterlattice host decreases by 51.7% at 2 K and 1 T and rapidly recovers in the dark. The observed giant negative photomagnetism is associated with anisotropic strain fields that guide defect-mediated photocarrier transport, thereby driving the system from a spin-dilute paramagnetic state toward a short-range antiferromagnetic state with quasi-one-dimensional characteristics. The alterlattice opens a route to three-dimensional defect-topology engineering for non-equilibrium phases and antiferromagnetic spintronics.
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高影响因子
JOURNAL OF NATURAL PRODUCTS
·
2025
·
IF 3.6
Xuan Wang,Xiaolin Tian,Jiawei Guo,Fangyuan Cheng,Mingyu Liu,Shanmin Zheng,Yangliu Feng,Ying Lv,Yuanning Li,Shengying Li,Xingwang Zhang
The biosynthetic mechanism underlying the formation of thiocarboxylic acid moieties in natural products remains largely unknown. Thioquinolobactin (TQB) is a Pseudomonas fluorescens derived siderophore that contains a thiocarboxylic acid moiety within its structure. Although the biosynthetic gene cluster and proposed pathway for TQB formation have been reported, the biosynthetic mechanism related to the thiocarboxylic acid formation are yet to be fully understood. In this study, we address this question by demonstrating that a unique dual-domain protein QbsL, which possesses both CoA ligase and methyltransferase activities, along with the sulfurtransferase QbsK, facilitates the assembly of the thiocarboxylic acid. Based on this mechanism, we develop a chemoenzymatic method to convert carboxylic acid into selenocarboxylic acid, thereby generating selenium-containing analogues of TQB. These findings resolve the long-standing mystery in TQB biosynthesis and expand the synthetic toolkit for carboxylic acid modification.
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高影响因子
ACS Omega
·
2017
·
IF 0
Dong Wang,Chong Huang,Jianqiao He,Xiangli Che,Hui Zhang,Fuqiang Huang
Oxygen stoichiometry is critical for physical properties, but it is hard to precisely control in many multivalent transition metal oxides, for example, cuprate superconductors, magnetoresistive manganite oxides, and TiOx (x < 2). We have developed a new method to synthesize rock-salt TiO in a sealed and evacuated quartz tube by using KClO4 as the only oxygen source to react with elemental Ti (in a Ti/O molar ratio of 1:1). The stoichiometric titanium monoxide (TiO) exhibits an enhanced superconductivity transition temperature (Tc) of 5.5 K, which is superior to the reported results of 0.5–2.3 K. The new synthetic method provides an excellent way to prepare stoichiometric oxides, and the enhanced superconductivity of TiO may initialize the restudy of the transport properties of Ti-containing oxides.
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Journal of Iberian and Latin American Research
·
2012
·
IF 0
Jan Servaes
Over the years the word ‘globalisation’ has increasingly been used to refer to a process through which the entire human population is bonded into a ‘single system’, a ‘single society’, or ‘the structuration of world as a whole’, as defmed by Robertson.2 This ‘single system,’ then forms the framework for individual activities and nation-state operations. It is conceived both as a journey and a destination—with arrival at the globalised state finality, which constitutes a unit of analysis in its own right.3 In other words, globalisation is seen as the widening, deepening and speeding up of worldwide interconnectedness in all aspects of contemporary social life.
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OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiang Meng,Jiajun Ma,Kang Xie,Liang Hong,Junxi Zhang,Zhijia Hu
We have demonstrated a low threshold and tunable flexible random laser (RL) in dye-doped poly ethylene glycol diacrylate (PEG-DA) hydrogel, which was prepared by crosslinking polymerization using PEG-DA monomer and photoinitiator. The random lasering is attributed to the light scattering from the porous structure of hydrogels, and the wavelength of random lasing can be tuned by ~3.2 nm in the temperature range from 30 °C to 70 °C. Under the continuous increasing and decreasing temperature cycle, the random lasing tunable phenomenon can still be observed, which proves that this flexible material can be used as a new temperature sensor . In addition, we also explored the application of flexible laser in phototherapy. Considering the good elasticity and transparency of hydrogels, this thermo-responsive property will be of great significance to the biomedical applications of flexible material.
研究领域:
生物医学工程
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光学工程
·
高分子材料科学
·
光子学
·
生物传感器
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高影响因子
ACS Nano
·
2018
·
IF 13.709
Miao-Ling Lin,Qing-Hai Tan,Jiang-Bin Wu,Xiao-Shuang Chen,Jin-Huan Wang,Yu-Hao Pan,Xin Zhang,Xin Cong,Jun Zhang,Wei Ji,Ping-An Hu,Kai-Hui Liu,Ping-Heng Tan
The material choice, layer thickness, and twist angle widely enrich the family of van der Waals heterostructures (vdWHs), providing multiple degrees of freedom to engineer their optical and electronic properties. The moiré patterns in vdWHs create a periodic potential for electrons and excitons to yield many interesting phenomena, such as Hofstadter butterfly spectrum and moiré excitons. Here, in the as-grown/transferred twisted bilayer MoS2 (tBLMs), one of the simplest prototypes of vdWHs, we show that the periodic potentials of moiré patterns also modify the properties of phonons of its monolayer MoS2 constituent to generate Raman modes related to moiré phonons. These Raman modes correspond to zone-center phonons in tBLMs, which are folded from the off-center phonons in monolayer MoS2. However, the folded phonons related to crystallographic superlattices are not observed in the Raman spectra. By varying the twist angle, the moiré phonons of tBLM can be exploited to map the phonon dispersions of the monolayer constituent. The lattice dynamics of the moiré phonons are modulated by the patterned interlayer coupling resulting from periodic potential of moiré patterns, as confirmed by density functional theory calculations. The Raman intensity related to moiré phonons in all tBLMs are strongly enhanced when the excitation energy approaches the C exciton energy. This study can be extended to various vdWHs to deeply understand their Raman spectra, moiré phonons, lattice dynamics, excitonic effects, and interlayer coupling.
研究领域:
凝聚态物理
·
材料科学
·
纳米技术
·
光电子学
·
声子学
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高影响因子
Nature Communications
·
2026
·
IF 18.1
Wang Yunfan,Zheng Zihao,Ren Lele,Du Yifeng,Guo Jinming,Zhang Shujun,Nan Ce-Wen,Li Bao-Wen
Sodium niobate (NaNbO 3 ), traditionally recognized as an antiferroelectric material, has garnered significant attention for its potential in energy storage, electromechanical devices, and electrocaloric applications. Central to unlocking its full potential is precise control over its ferroic orders, particularly the transition between antiferroelectric and ferroelectric phases. In this study, we propose a topochemical conversion strategy for fabricating pure ferroelectric NaNbO 3 membranes with a P 2 1 ma orthorhombic phase regardless of membrane thickness. Using Scanning transmission electron microscopy, we identify two distinct regions with large ( > 10°) or small ( < 1°) octahedral tilts in the ferroelectric NaNbO 3 membranes. Polarization analyses in these regions reveal that the ferroelectricity originates from the out-of-plane displacement of Nb 5+ cations. Additionally, the pure ferroelectric NaNbO 3 membranes demonstrate thickness-dependent piezoelectric enhancement, achieving a d 33 value of 93.7 pm/V at 30 nm thickness, as well as pronounced resistance switching behaviors. This study introduces an innovative molten salt environment-controlled synthesis strategy, enabling efficient production of high-quality pure ferroelectric NaNbO 3 membranes, and advancing their integration into next-generation functional devices.
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高影响因子
Science China-Physics Mechanics & Astronomy
·
2026
·Vol. 69
·期 10
·107011
·
IF 7.2
Chen Zhihui,Song Yuanhe,Lou Xia,Li Chihao,Chen Xiuhua,Wang Yilin,Luo Yixuan,Guo Yanfeng,Peng Rui,Xu Haichao,Feng Donglai
Electron correlation effects in 3 d transition-metal compounds often play an important role in shaping their low-energy electronic properties. Here, using high-resolution angle-resolved photoemission spectroscopy, we investigate the electronic correlation behavior of CrSb, an altermagnetic material. Our measurements reveal the three-dimensional electronic structure of CrSb. A band splitting of about 1.1 eV is observed, consistent with previous reports. The comparison between experiment and density functional theory calculations shows renormalization factors of approximately 1.22–1.45 near the Fermi level, indicating moderate electron correlations. Notably, the renormalization is found to be momentum-dependent and band-dependent. These results provide insight into the role of electron correlations in altermagnetic CrSb and their reshaping of the low-energy electronic structure, which may be relevant for understanding its electronic properties and potential applications.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 19
·11932
·
IF 6.208
Xue Han,Xiaowen Xu,Tingting Yu,Meifeng Li,Yulong Liu,Jingli Lai,Huiling Mao,Chengyu Hu,Shanghong Wang
Diflubenzuron is an insecticide that serves as a chitin inhibitor to restrict the growth of many harmful larvae, including mosquito larvae, cotton bollworm and flies. The residue of diflubenzuron is often detected in aquaculture, but its potential toxicity to aquatic organisms is still obscure. In this study, zebrafish embryos (from 6 h to 96 h post-fertilization, hpf) were exposed to different concentrations of diflubenzuron (0, 0.5, 1.5, 2.5, 3.5 and 4.5 mg/L), and the morphologic changes, mortality rate, hatchability rate and average heart rate were calculated. Diflubenzuron exposure increased the distance between the venous sinus and bulbar artery (SV-BA), inhibited proliferation of myocardial cells and damaged vascular development. In addition, diflubenzuron exposure also induced contents of reactive oxygen species (ROS) and malondialdehyde (MDA) and inhibited the activity of antioxidants, including SOD (superoxide dismutase) and CAT (catalase). Moreover, acridine orange (AO) staining showed that diflubenzuron exposure increased the apoptotic cells in the heart. Q-PCR also indicated that diflubenzuron exposure promoted the expression of apoptosis-related genes (bax, bcl2, p53, caspase3 and caspase9). However, the expression of some heart-related genes were inhibited. The oxidative stress-induced apoptosis damaged the cardiac development of zebrafish embryos. Therefore, diflubenzuron exposure induced severe cardiotoxicity in zebrafish embryos. The results contribute to a more comprehensive understanding of the safety use of diflubenzuron.Keywords:diflubenzuron;zebrafish embryo;cardiotoxicity;oxidative stress;apoptosis
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Oxidative Medicine and Cellular Longevity
·
2022
·
IF 7.31
Yawen Deng,Zhitong Li,Xiangbo An,Rui Fan,Yao Wang,Jiatian Li,Xiaolei Yang,Jiawei Liao,Yunlong Xia
Hyperhomocysteinemia (HHcy) is positively linked with several cardiovascular diseases; however, its role and underlying mechanisms in pathological cardiac hypertrophy are still unclear. Here, we focused on the effects and underlying mechanisms of HHcy in hypertensive cardiac hypertrophy, one of the most common and typical types of pathological cardiac hypertrophy. By a retrospective analysis of the association between HHcy and cardiac hypertrophy in a hypertensive cohort, we found that the prevalence of HHcy was higher in patients with hypertrophy and significantly associated with the presence of cardiac hypertrophy after adjusting for other conventional risk factors. In mice, HHcy induced by a methionine (2% wt/wt) diet feeding significantly promoted cardiac hypertrophy as well as cardiac inflammation and fibrosis induced by 3-week angiotensin ІІ (AngІІ) infusion (1000 ng/kg/min), while folic acid (0.006% wt/wt) supplement corrected HHcy and attenuated AngII-stimulated cardiac phenotypes. Mechanistic studies further showed that homocysteine (Hcy) exacerbated AngII-stimulated expression of Calcineurin and nuclear factor of activated T cells (NFAT), which could be attenuated by folic acid both in mice and in neonatal rat cardiomyocytes. Moreover, treatment with cyclosporin A, an inhibitor of Calcineurin, blocked Hcy-stimulated Calcineurin-NFAT signaling and hypertrophy in neonatal rat cardiomyocytes. In conclusion, our study indicates that HHcy promotes cardiac hypertrophy in hypertension, and Calcineurin-NFAT pathway might be involved in the pro-hypertrophic effect of Hcy.
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