JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuyan Xu,Pengfeng Zhu,Caiqin Wang,Daoyong Zhang,Ming Zhang,Xiangliang Pan
The behavior and fate of PFOS (perfluorooctanesulfonate) in the aquatic environment have received great attention due to its high toxicity and persistence. The nanoscale supramolecular mechanisms of interaction between PFOS and ubiquitous EPS (exopolymers) remain unclear though EPS have been widely-known to influence the bioavailability of PFOS. Typically, the exposure patterns of PFOS in aquatic animals changed with the EPS-PFOS interaction are not fully understood. This study hypothesized that PFOS exposure and accumulation pathways depended on the PFOS-EPS interactive assembly behavior and animal species. Two model animals, zebrafish and chironomid larvae, with different feeding habitats were chosen for the exposure and accumulation tests at the environmental concentrations of PFOS in the absence and presence of EPS. It was found that PFOS triggered the self-assembly of EPS to form large aggregates which significantly trapped PFOS. PFOS accumulation was significantly promoted in zebrafish but drastically reduced in chironomid larvae because of the nanoscale interactive assembly between EPS and PFOS. The decreased dermal uptake but increased oral uptake of PFOS by zebrafish with large mouthpart size could be ascribed to the increased ingestion of PFOS-enriched EPS aggregates as food. For the chironomid larvae with small mouthpart size, the PFOS-EPS assemblies reduced the dermal, oral and intestinal uptake of PFOS. The nano-visualization evidences confirmed that the PFOS-enriched EPS-PFOS assemblies blocked PFOS penetration through skin of both animals. These findings provide novel knowledge about the ecological risk of PFOS in aquatic environments.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Gao Xiaoyi,Cheng Zhenxiang,Chen Zibin,Liu Yao,Meng Xiangyu,Zhang Xu,Wang Jianli,Guo Qinghu,Li Bei,Sun Huajun,Gu Qinfen,Hao Hua,Shen Qiang,Wu Jinsong,Liao Xiaozhou,Ringer Simon P.,Liu Hanxing,Zhang Lianmeng,Chen Wen,Li Fei,Zhang Shujun
(K,Na)NbO 3 based ceramics are considered to be one of the most promising lead-free ferroelectrics replacing Pb(Zr,Ti)O 3 . Despite extensive studies over the last two decades, the mechanism for the enhanced piezoelectricity in multi-elements doped (K,Na)NbO 3 ceramics has not been fully understood. Here, we combine temperature-dependent synchrotron x-ray diffraction and property measurements, atomic-scale scanning transmission electron microscopy, and first-principle and phase-field calculations to establish the dopant–structure–property relationship for multi-elements doped (K,Na)NbO 3 ceramics. Our results indicate that the dopants induced tetragonal phase and the accompanying high-density nanoscale heterostructures with low-angle polar vectors are responsible for the high dielectric and piezoelectric properties. This work explains the mechanism of the high piezoelectricity recently achieved in (K,Na)NbO 3 ceramics and provides guidance for the design of high-performance ferroelectric ceramics, which is expected to benefit numerous functional materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Zhoujie Wang,Qiuyi Lu,Chaopeng Liu,Huadong Tian,Jingyi Wang,Lei Xie,Qi Liu,Hongbo Zeng
The mobility and distribution of heavy metal ions (HMs) in aquatic environments are significantly influenced by humic acid (HA), which is ubiquitous. A quantitative understanding of the interaction mechanism underlying the adsorption and retention of HMs by HA is of vital significance but remains elusive. Herein, the interaction mechanism between HA and different types of HMs (i.e., Cd(II), Pb(II), arsenate, and chromate) was quantitatively investigated at the nanoscale. Based on quartz crystal microbalance with dissipation tests, the adsorption capacities of Pb(II), Cd(II), As(V), and Cr(VI) ionic species on the HA surface were measured as ∼0.40, ∼0.25, ∼0.12, and ∼0.02 nmol cm–2, respectively. Atomic force microscopy force results showed that the presence of Pb(II)/Cd(II) cations suppressed the electrostatic double-layer repulsion during the approach of two HA surfaces and the adhesion energy during separation was considerably enhanced from ∼2.18 to ∼5.05/∼4.18 mJ m–2. Such strong adhesion stems from the synergistic metal–HA complexation and cation−π interaction, as evidenced by spectroscopic analysis and theoretical simulation. In contrast, As(V)/Cr(VI) oxo-anions could form only weak hydrogen bonds with HA, resulting in similar adhesion energies for HA–HA (∼2.18 mJ m–2) and HA–As(V)/Cr(VI)–HA systems (∼2.26/∼1.96 mJ m–2). This work provides nanoscale insights into quantitative HM–HA interactions, improving the understanding of HMs biogeochemical cycling.
研究领域:
环境科学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yulong Yang,Weifeng Yuan,William Johnson,Eddy Pazmino,Lu Yuan,Zhenjiang You
Nanoscale charge heterogeneity is often invoked to explain colloid attachment to grain surfaces in the presence of repulsive energy barriers, yet characterizing its direct impact on the detected spatial variation of colloid-surface interactions through spectroscopy remains unexplored. To gain deeper insights into how intrinsic charge heterogeneity impacts colloid-surface adhesion forces, we measured the spatial distribution of adhesion forces between carboxylated polystyrene latex microspheres and hydrophilic silica substrates in an aqueous solution across different NaCl concentrations (SC) using colloid-probe atomic force microscope (AFM). Trends of mean measured adhesion force with SC were compared to predictions from DLVO and extended DLVO (xDLVO) theories. The xDLVO framework successfully captured the observed trend with NaCl concentration via the impact of NaCl concentration on the repulsive hydration force. Incorporating nanoscale charge heterogeneity into colloid-surface interaction simulations reproduced the experimentally-observed variation around the mean, highlighting the prominent contribution of charge heterogeneity to observed spatial variation of adhesion forces.
研究领域:
表面科学
·
胶体化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 18
·25063-25068
·
IF 5.6
Limei Hou,Weihao Zhai,Yingfei Xin,Yating Zhuang,Chongyang Fu,Shanmei Du,Jin Wang,Xiaoxiong Wang
Flexoelectric effect refers to the phenomenon of electric polarization under the action of material deformation gradient . When the material is strained, the local strain gradient will cause the electric dipole moment to rearrange , thereby generating an electric field in the material. Different from the piezoelectric effect , the flexoelectric effect is not limited by the symmetry of materials. Furthermore, the flexoelectric effect exhibits a significant size effect , allowing for huge flexoelectric signals to be obtained in nanoscale systems. Therefore, the flexoelectric effect has a wider application prospect and development space. There are differences in the number dimension between the flexoelectric coefficient and the piezoelectric coefficient , but both flexoelectric and piezoelectric effects result in the induction of electric dipole moments. In analogy to the piezoelectric effect, the polarization intensity may influence the flexoelectric coefficient. In this study, we selected the typical piezoelectric material barium titanate (BaTiO 3 ) and employed the forward/reverse and continuous polarization method to regulate the dipole moment arrangement. We measured the piezoelectric-like effect and flexoelectric-like effect under different polarization voltages with using a quasi-static d 33 measuring instrument and a two-step dot-loop method. The results confirmed that the polarization process intrinsically enhances the flexoelectric coefficient. At a polarization voltage of 600 V, the flexoelectric-like coefficient reached 180 pC/N, which is more than twenty times stronger than that of the non-polarized sample (7 pC/N). This study provides a simple and feasible idea for the enhancement of macroscopic flexoelectric coefficients.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
纳米力学
·
介电物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 7
·3135-3142
·
IF 10.733
Xiangyun Zhao,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Yuena Meng,Qingbo Meng,Zhi Zheng,Sixin Wu
Although low-temperature selenization technology offers several advantages in terms of production costs and beneficial composition profile controlling for Cu2ZnSn(S,Se)4 (CZTSSe) solar cells, excellent performance has not yet been achieved primarily due to the increased number of electronic disorders, smaller grain sizes, and more grain boundaries. In this study, a universal strategy for significantly increasing the power conversion efficiency (PCE) of low-temperature processed CZTSSe solar cells through directly dissolving the fluxing agent antimony into the as-prepared precursor solution is demonstrated. The key feature of this approach is that Sb atoms actually act without entering into the lattice and leave almost no residue within the absorber after taking effect. By appropriately adjusting the antimony incorporation concentration, the grain size, fine-grain layer thickness, local defect chemistry environment, and hole carrier concentration can be simultaneously improved, especially at low temperatures. More importantly, a larger band bending around the grain boundary (GB) is also observed by increasing the potential value from 40 mV to 100 mV after antimony incorporation, which can facilitate the GB-dominated carrier separation process. Due to the antimony-assisted morphology and enhancement in the nanoscale electrical properties, the CZTSSe device could maintain its performance at a lower temperature of 80 °C and directly decrease the selenization temperature down to 470 °C. This systematic study presents a new aspect for overcoming the challenges encountered at low temperatures, and our findings further support the great feasibility for the future application of low-temperature-processed CZTSSe photovoltaic technology to meet the industrial-scale production standards.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Feng Zhao,Qiang Tao,Cun You,Meiyan Ye,Li Li,Yang Han,Shushan Dong,Xin Wang,Tian Cui,Pinwen Zhu
MoB 2 , with a layered structure, is a potential functional material that is expected to be used as catalysts and conductors. However, the lower hardness limits its application in extreme environment. Solid-solution hardening is a suitable way to enhance hardness and keep structure, but it is complicated in transition metal borides (TMBs) solid solutions . Up to now, uncovering the intrinsic factors of solid-solution hardening is still a challenge. In this work, the structural, electronic and hardness properties of Mo 1-x W x B 2 ( x = 0.01~0.20) is studied to explore the potential factors. It is found that sharp increase in hardness of Mo 1-x W x B 2 at low W doping level (≤5 at%), and highest Vickers hardness of 26.7 ± 1.2 GPa (applied 0.49 N load) was obtained by Mo 0.95 W 0.05 B 2 . The high hardness reason is ascribed to the lattice distortions lead to internal stress at the nanoscale , which created local symmetry reduction by affected local electron distribution of B–B bond and the lattice position of Mo atoms. Moreover, at higher W doping level, TM-B bond is strengthened by increasing electron transfer from the tungsten atoms to the boron atoms , which resulting in the hardness increasing of Mo 1-x W x B 2 . This provides guidance for designing TMBs solid solutions with better mechanical properties.
研究领域:
材料科学
·
固体物理
·
无机非金属材料
·
结构与性能关系
·
过渡金属硼化物
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Gaoming Li,Yeping Wu,Guohua Hang,Xibing Shen,Zhongtao Chen,Mao Chen,Xiuli Zhao,Yinyu Zhang,Sixun Zheng
Epoxy thermosets have been widely used in engineering applications due to their excellent thermal stability and chemical resistance. However, their inherent brittleness causes low bonding strength. Therefore, improvement of toughness is required. By using a variety of modifiers, epoxy thermosets can be toughened via the generation of fine phase-separated morphologies. In this work, we reported the toughening of epoxy thermosets with polyhedral oligomeric silsesquioxane (POSS)-capped poly(ε-caprolactone)s (PCL) . By taking control of types of R groups ( i.e., isobutyl and/or isooctyl) of POSS cages and the lengths of PCL chains, the epoxy thermosets were regulated with the morphologies from nano-to macro-scales. It was found that the improvement of toughness was quite dependent on types of R groups of POSS cages. Under the identical condition, the thermosets contain isooctyl POSS-PCL n had the fracture toughened larger than those containing isobutyl POSS groups. For the thermoset containing 15 wt% of isooctyl POSS-PCL 1.00 , the critical stress intensity factor ( K IC ) was enhanced from 0.70 to 1.69 MPa m 1/2 at room temperature and from 1.11 to 2.51 MPa m 1/2 at low temperature and the thermal stability remained invariant. Furthermore, the bonding strength on stainless steel and anodized aluminum substrates were significantly improved with the incorporation of 15 wt% of isooctyl POSS-PCL 1.00 . These findings provide a novel approach to regulate phase structure in epoxy thermosets, offering the insights into structure-performance relationships, thus opening up a new way for designing epoxy resins with high toughness and adhesive strength.
研究领域:
高分子材料科学
·
复合材料工程
·
表面与界面化学
·
材料力学性能
·
胶体与界面科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Yingya Wang,Lingyu Ran,Lingya Ma,Runliang Zhu,Jingming Wei,Hongmei Liu,Yunfei Xi,Jianxi Zhu,Hongping He
The variable structural characteristics of montmorillonite (Mnt) in salt solutions depend not only on the quantity and distribution of the Mnt layer charge, but also on the specificity of counterions, including their radius, valence, concentration, and hydratability. In order to determine the nanoscale chemomechanical processes in a clay mineral–water–salt system, in situ X-ray diffraction (XRD) and atomic force microscopy (AFM) methods were used to investigate the structural variations of Mnt caused by different counterion species ( e.g. , Li + , Na + , K + , Rb + , Cs + , Mg 2+ , Ca 2+ , and Sr 2+ ) at different concentrations (0.2–3.0 M). With an increasing concentration of counterions, separation of water molecules from the interlayer space of more weakly hydrated cations (Cs + , Rb + , and K + ) is faster than for the more strongly hydrated cations (Li + , Na + , Mg 2+ , Ca 2+ , and Sr 2+ ), water molecules are lost more slowly from the hydration shell, which remains stable even at high counterion concentrations . The sequential ion exchange in a monolayer Mnt observed by in situ AFM is consistent with the d (001) results from the real-time XRD analysis . Moreover, various defects on Mnt surfaces were visible in the high-resolution AFM images, which restrict the spatial arrangement of adsorbed cations. The water molecule partitioning between the interlayers in Mnt is controlled by the specificity of the counterions, and the cations can spontaneously form ordered structures on the surface of Mnt. These nonclassical interfacial phenomena occurred in the electric double layer (EDL) is controlled by the hydration of counterions, the surface structure and the charge distribution of Mnt.
研究领域:
矿物学
·
材料科学
·
界面化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ning Chen,Dong Yang,Zi-Long Zhang,Jun-Hui Su,Wen-Yu Yang,Fu Li,Guang-Xing Liang,Jing-Ting Luo,Yue-Xing Chen,Zhuang-Hao Zheng
Flexible thermoelectric (TE) materials are promising candidates for powering wearable electronics and self-sustained microdevices. Here, we report the synthesis of S-doped Bi 2 Te 3 flexible thin films (f-TFs) on polyimide (PI) substrates via a two-step method combining physical vapor deposition and subsequent thermal diffusion. Sulfur incorporation effectively substitutes Te in the Bi 2 Te 3 lattice, leading to lattice contraction and a moderate increase in carrier concentration. Structural analyses reveal that S doping shortens the Bi–Te/S bonds and weakens interlayer van der Waals interactions, facilitating strain relaxation through nanoscale slip. As a result, the 3.8 % S-doped film achieves a peak power factor of 14.8 μW cm −1 K −2 at 300 K and exhibits moderate electrical-conductivity stability under repeated bending, with resistance variation below 10 % after 1000 cycles. These findings demonstrate that thermal diffusion-driven compositional tuning provides a practical approach to enhancing both thermoelectric performance and mechanical flexibility in Bi 2 Te 3 -based f-TFs.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jinqiu Du,Zhiyuan Liu,Zhe Zhu
In this paper, LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NMC811) thin films were prepared by the sol-gel method based on different parameter conditions, and the microstructure and electrochemical properties of the films were compared to obtain the film sample under the best preparation parameters. In order to explain the formation mechanism of cell battery performance based on the NMC811 cathode at the nano scale , electrochemical strain microscopy, conductive atomic force microscopy and Kelvin probe force microscopy are specifically utilized to study the changes of NMC811 thin film in electrochemical deformation, conductivity, and potential distribution under different electrical and thermal fields. The results indicate that the local amplitude, conductivity, and electrical potential of thin film in the scanning region increases with the voltage from 0 V to 3 V and the temperature from 25 °C to 150 °C. However, the electrochemical deformation, conductivity, and potential of the film decrease significantly when the voltage is applied to 4 V or the temperature rises to 200 °C. These results provide visual evidence for the influence of external field on the phase structure change and lithium-ion diffusion behavior of NMC811 thin film.
研究领域:
材料科学
·
电化学
·
纳米科技
·
固体离子学
·
能源材料
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2019
·
IF 2.886
Fan Deng,Yongmin Wu,Weiping Tang,Shufeng Song,Zhaoyin Wen,Masashi Kotobuki,Li Lu,Jianyao Yao,Ning Hu,Janina Molenda
The use of garnet-type conductors as electrolytes for safe lithium solid-state batteries is impeded by the lack of critical processing strategy to stabilize and densify the cubic lithium garnets. The synthesis and processing of dense cubic lithium garnets are typically depending on solid state reaction as a result of unintentional Al contamination from the alumina crucibles at temperatures up to 1230 °C. High Al concentration is also believed to induce the sluggish migration of lithium ions . Here, we demonstrate an ultrathin, conformal γ-Al 2 O 3 surface coating on garnet solids by a hybrid microemulsion solid-state method for accomplishing rational and controllable synthesis and processing of dense cubic garnets with low Al concentration. The γ-Al 2 O 3 coating demonstrates fast-ion conducting Al-doped Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 phase with low Al concentration (~0.17 mol per formula unit), low tetragonal-to-cubic phase transformation temperature of 500 °C, and total conductivity of ~4.4 × 10 − 4 S cm − 1 . Specifically, the desired microstructures of the sintered pellets with uniform grains are revealed. As a proof-of-concept, we demonstrate that the nanoscale γ-Al 2 O 3 modification garnet conductor Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 is available to suppress lithium dendrites in symmetric Li/γ-Al 2 O 3 coating Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 /Li cells during lithium plating/stripping at room temperature, with current densities of 0.026 to 0.5 mA cm − 2 . The Li/γ-Al 2 O 3 coating Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 /LiNi 0.5 Co 0.2 Mn 0.3 O 2 cell delivered a high initial discharge capacity of ~164.2 mAh g − 1 , more importantly, an outstanding cycling performance with a capacity retention of 90.16% after 30 cycles at 0.1C and room temperature. This new synthesis route and the utilization of nanoscale γ-Al 2 O 3 surface modification could open up new avenue to lithium garnet conductors with reliable synthesis for all-solid-state lithium batteries application.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）