LANGMUIR
·
2022
·
IF 4.331
Xunqiang Zhang,Wenqing Xie,Sinan Du,Huaguang Wang,Zexin Zhang
Inorganic particles with photocatalytic properties are excellent candidates for the fabrication of micromotors. To achieve self-propulsion, the geometric and chemical symmetries of inorganic particles should be broken. However, the synthesis of micromotors with different geometric and chemical symmetries remains challenging. In this paper, a simple synthesis method is proposed to prepare rod-shaped micromotors with different patches, leading to distinct geometric and chemical symmetries. The micromotors are composed of zinc oxide (ZnO) microrods partially patched with polysiloxanes at different positions. The patches of the micromotors can be roughly regulated by varying the amount of siloxanes used in the synthesis. These micromotors are propelled in H2O2 solution by an ionic self-diffusiophoresis mechanism, which exhibits two motion modes, including linear motion and circular motion, due to different patch positions. Moreover, the degradation of organic dyes by the micromotors depending on the patches is demonstrated.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Wei Li,Zhilei Sui,Huarong Liu,Zengming Zhang,Hewen Liu
The high-pressure structural properties of PCP were investigated by using Raman scattering techniques in a diamond anvil cell up to 10 GPa at room temperature. Compression caused a relative flat xylyl fragment and twisted ethylene bridges in PCP. Raman analysis showed that more peaks related to vibrational modes of aliphatic CH2 emerged due to the transition to a low symmetric phase after compression pressure reached 3.9 GPa. Other blue-shifting peaks showed discontinuity in the frequency–pressure curves at pressure 3.9 GPa because of molecular relaxation by phase transition. Compression strengthened the conjugation of xylyl fragments. When releasing pressure, the normal vibrational modes could be recovered with a hysteresis of ∼1.3 GPa. The normal phase of PCP could be fully recovered under ambient conditions.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2023
·
IF 15
Yong Ai,Wei-Qiang Liao,Yan-Ran Weng,Hui-Peng Lv,Xiao-Gang Chen,Xian-Jiang Song,Peng-Fei Li,Ren-Gen Xiong
Fullerenes offer versatile functionalities and are promising materials for a widespread range of applications from biomedicine and energy to electronics. Great efforts have been made to manipulate the symmetries of fullerene and its derivatives for studying material properties and novel effects, such as ferroelectricity with polar symmetry; however, no documentary report has been obtained to realize their ferroelectricity. Here, for the first time, we demonstrated clear ferroelectricity in a fullerene adduct formed by C60 and S8. More is different: the combination of the most symmetric molecule C60 with the highest Ih symmetry and molecule S8 with high D4d symmetry resulted in the polar C60S8 adduct with a low crystallographic symmetry of the C2v (mm2) point group at room temperature. The presented C60S8 undergoes polar-to-polar ferroelectric phase transition with the mm2Fm notation, whose ferroelectricity was confirmed by a ferroelectric hysteresis loop and ferroelectric domain switching. This finding opens up a new functionality for fullerenes and sheds light on the exploration of more ferroelectric fullerenes.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 1.9
Sarmad Soomro,Zhenkun Sun,Dennis Y. Lu,Zhihao Zhou,Lin Li,Lunbo Duan
Catalyst deactivation due to carbon deposition and sintering poses a significant challenge to the efficient dry reforming of CH 4 and CO 2 into syngas, particularly at high Ni loadings. To tackle this difficulty, ordered mesoporous silicas with varied pore symmetries were employed as supports in this study to synthesize the Ni-based catalysts using hydrothermal treatment. The 10% Ni/MCM-41 catalyst exhibited the highest conversion rates for CO 2 (81%) and CH 4 (77%), with favourable H 2 /CO (0.92) ratios indicating efficient syngas production Higher Ni concentrations increase active sites and catalytic performance, they also increase carbon deposition, reducing catalyst durability. At lower Ni loadings (4% Ni), catalysts with a 3D pore structure showed improved activity and stability, effectively reducing carbon deposition. This study demonstrates that optimized mesopore symmetries and Ni loadings can enhance catalyst efficiency and durability for syngas production.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 17
·5648-5656
·
IF 6.1
Yuhan Hu,Xi Xu,Ruixi Wang,Jingyun Han,Shunsong Zhang,Shuhui Zhan,Jingyu Guo,Li-Ming Wu,Ling Chen
Tin(II)-containing phosphates are promising candidates for designing and studying materials with enhanced birefringence. Herein, we present a novel compound [Sn3OF]PO4 that exhibits significant birefringence (Δnobv. = 0.117 at 546 nm), a five-fold improvement compared to that of the related compound [Sn3F3]PO4 discovered nearly 40 years ago. The remarkable enhancement in birefringence is primarily attributed to the anisotropic [SnO3F]5− structure building unit. By simple regulation of the F/O ratio, the undesirable R3 symmetry in [Sn3F3]PO4 is disrupted. This regulation also realigns the lone pairs, resulting in substantial optical anisotropy.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2021
·Vol. 8
·期 5
·1376-1388
·
IF 8.131
Zihan Kang,Enzhu Lin,Ni Qin,Jiang Wu,Baowei Yuan,Dinghua Bao
Piezocatalysis has emerged as a novel technique to make use of mechanical energy in dealing with organic pollutants in wastewater. In this work, ferroelectric Bi2WO6 (BWO) nanosheets with a characteristic layered crystal structure and in-plane polarization were investigated, with special interest in the influence of their crystal symmetry and oxygen vacancies on the piezocatalytic performance. The nanosheets were synthesized by a hydrothermal process along with thermal annealing at different temperatures and atmospheres. The crystal symmetry, grain size and oxygen vacancies of the crystals were characterized by XRD, SEM, XPS and Raman spectroscopy. The piezocatalytic properties were investigated by degrading Rhodamine B (RhB) solution under ultrasonic vibration. The free radicals generated by ultrasonic treatment were detected and characterized using the electron spin resonance (ESR) method. The essential role of hydroxyl radicals in the dye degradation process was demonstrated by controlled experiments with different scavenger additives. The results show that the crystalline size and oxygen vacancies affect the degree of orthorhombic distortion and formation of defect energy levels, respectively, which will further affect the distribution of piezoelectric potential and piezocatalytic activity. This work will enable us to understand the influence of oxygen vacancies and crystal symmetry on piezocatalysis more intuitively and design more efficient piezocatalysts via a heat treatment control strategy.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2024
·Vol. 12
·期 8
·2411960
·
IF 14.3
Chen-Yi Zhao,Chun-Li Hu,Nian-Tzu Suen,Xiao-Hui Li,Hai-Ping Xu,Wenfeng Zhou,Sheng-Ping Guo
Chalcogenides are the most important infrared nonlinear optical (NLO) material candidates, and the exploration of high-performance ones is attractive and challengeable. Hitherto, there is no NLO scandium (Sc) chalcogenides experimentally studied. Here, new quaternary Sc thiophosphate CsScP 2 S 7 (CSPS) was synthesized by the facile metal oxide-boron-sulfur/reactive flux hybrid solid-state method. It crystallizes in the monoclinic chiral space group C 2, and the layered structure is composed by the new ScP 2 S 11 functional motifs built by ScS 6 octahedra and P 2 S 7 dimers, and the structure-performance analysis reveals that the hyperpolarizability of ScP 2 S 11 is much greater than the assembled units (ScS 6 and PS 4 ), which makes the first NLO Sc chalcogenide CSPS exhibits strong NLO response (0.8 × AGS) and high laser-induced damage threshold (LIDT) (4.3 × AGS), and a wide bandgap of 3.10 eV. With the coordination number's reduction of rare-earth (RE) ion and the rearrangement of P 2 S 7 dimers, the centrosymmetric structure of CsREP 2 S 7 family can be broken via substitution with the smallest RE element Sc to form the noncentrosymmetric structure. This work not only discovers a new high-performance infrared NLO material, but also will inspire researchers to explore more potential NLO Sc chalcogenides.
研究领域:
材料科学
·
晶体学
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2023
·Vol. 38
·期 8
·1465-1476
·
IF 2.9
Sheng Wu,Puxian Xiong,Kexin Qin,Yao Xiao,Binli Xiao,Kang Chen,Dongliang Jiang,Yinzhen Wang
Mechanoluminescence (ML) materials have found potential applications in information storage, anti-counterfeiting, and stress sensing. Conventional stress sensing based on absolute ML intensity is prone to significant mistakes owing to the unpredictability of measurement surroundings. However, implementing a ratiometric ML sensing technique may considerably ameliorate this issue. In this study, a single activator-doped gallate material (LiGa 5 O 8 :Pr 3+ ) is proposed to determine the relationship between the ML intensity and the change in local positional symmetry that occurs when the material is subjected to stress. The sensing reliability of the ML intensity ratio under different factors (Force; Content; Thickness and Materials) is systematically analyzed, where the factor that has the greatest effect on the proportional ML is the concentration, with the ML intensity asymmetry ratio decreasing from 1.868 to 1.300 varying concentration at constant stress. The colour-resolved visualization of stress sensing is further realized, which opens a new path for a ratiometric ML-based strategy to improve the reliability of stress sensing.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Jing Zhang,Gemei Cai,Wenjun Wang,Li Ma,Xiaojun Wang,Zhanpeng Jin
The local symmetry of a Eu3+ ion has a crucial effect on its luminescence properties. In this work, we show that the red/orange ratio in the emission of Eu3+-doped MgIn2P4O14 phosphors is tunable by adjusting the Eu3+ concentrations, due to the change in the local symmetry of metal ions. The substitution of Eu3+ for In3+ lowers the distortion in the lattice of monoclinic MgIn2P4O14, and an increase in Eu3+ doping concentration causes the metal ion sites to shift closer to an inverse center, leading to a reversal of the relative emission intensity of a magnetic dipole transition to an electric dipole transition. Meanwhile, the higher asymmetry of metal ion sites occupied by Eu3+ in MgIn2P4O14 makes the luminescence less thermally stable than that in Mg3In4P6O24.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Xiuling Guo,Chao Feng,Zihao Yang,Shingo Hasegawa,Ken Motokura,Yong Yang
Engineering the local coordination environment of single metal atoms is an effective strategy to improve their catalytic activity, selectivity, and stability. In this study, we develop an asymmetric Pd–Ag diatomic site on the surface of g-C3N4 for the selective electrocatalytic semihydrogenation of alkynes. The single Pd atom catalyst, which has a locally symmetric Pd coordination, was inactive for the semihydrogenation of phenylacetylene in a 1 M KOH and 1,4-dioxane solution at an applied potential of −1.3 V (vs RHE). In sharp contrast, doping Ag sites into single Pd atom catalyst to form paired Pd–Ag diatomic sites with asymmetric Pd coordination substantially enhanced the reaction, resulting in a high conversion (>98%) with exceptional time-independent selectivity to styrene under identical conditions. Characterization and theoretical calculations reveal that the introduction of a Ag site into single Pd atoms disrupts their symmetry coordination by forming Pd–Ag bonds with N2–Pd–Ag–N configuration, thereby modulating the electronic and geometric structures of Pd sites, which in turn benefits the adsorption and activation of substrate and lowers energy barrier for the rate-determining step of semihydrogenation, ultimately enhancing the electrocatalytic reaction. This work provides a facile and powerful strategy for the design of advanced catalysts by tuning the local coordination environment for selective catalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xue Zhang,Guoshuai Li,Feng Mao,Dongdong Han,Chengbin Jing,Ye Chen,Pingxiong Yang,Junhao Chu,Fangyu Yue
Doping- and temperature-induced phase transitions and optical/electric-properties for (1- x )KNbO 3 - x (Ba 0.5 Bi 0.5 )(Nb 0.5 Zn 0.5 )O 3 ceramics are studied. With the increase of x -value, a series of structural phase transitions from orthorhombic to tetragonal and to cubic is observed, and the phase transition temperatures are also improved for forming a stable phase. The deteriorated ferroelectric property , which also suggests the doping-induced phase transition due to the enhancement of the crystal symmetry , can be tentatively interpreted from the optical evolution with doping. This doping can introduce or enhance the bandedge- or in-gap states but without influence upon the optical bandgap of KNbO 3 . These results help in understanding the control of the structure, optical and electrical properties in KNbO 3 -based ferroelectric oxides.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 23
·15835-15840
·
IF 3.906
Jianning Jin,Hua Yu,Liying Guo,Jinjin Liu,Bing Wu,Yuao Guo,Yuting Fu,Lijuan Zhao
β-NaREF4 (RE: rare earth metals) is a peculiar crystal due to its intriguing disordered structure. This crystal is usually considered to have an average structure with a space group of P-6 (174). However, a long-term contradiction existing in this system is that the luminescence characteristics do not match the corresponding theoretical predictions based on the average structure. To resolve this contradiction, we proposed a reasonable local structure model clearly showing the local symmetry of the cations based on the measurement of the extended X-ray absorption fine structure of β-NaGdF4. We also observed an intrinsic distortion in the disordered structure that resulted from the disordered arrangement of the Na+ and Gd3+ cations. Furthermore, using Eu3+ as a photoluminescence probe, we concluded that the breakdown in the crystallographic site symmetry originated from the intrinsic distortion of these crystals. This work provides a comprehensive explanation for the contradiction observed in this system and a foundation for further investigations to understand such disordered structures.
研究领域:
材料科学
·
晶体学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）