NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 31
·13805-13813
·
IF 2.7
Lei Huai,Wenlong Liu,Bei-Bei Zhang,Ru-Ling Tang,Yi-Lei Lv,Yue-Qi Wei,Sheng-Ping Guo
Borate crystals have gathered widespread focus due to their rich chemical structures and unique properties. Four centric Ag–borates, Ag7B9O16(OH)2(1), Ag8B8O15Cl2(2), Ag8B8O15(OH)Br (3), and Ag11B8O16I3(4), with diverse B–O anion groups and frameworks have been successfully obtained by the mild hydrothermal methods. (1) and (4) have one-dimensional structures and contain {[B11O24(OH)2]17−}∞ and {[B9O20]13−}∞ anion chains, respectively. (2) is 2D borate chloride with unprecedented [B9O21] (9B: 9 : 3[(3 : Δ + 2□)) fundamental building blocks. (3) is the first hydroxy-silver borate bromide and has novel B8O19(OH)] (8B: 3Δ5□ (2(3 : Δ + 2□) + (3□) + 1 : Δ)) fundamental building blocks. (2) and (3) possess the involuted 2D B–O framework with three types of channels, namely, 12-, 16- and 20-membered-ring (MR) channels. (4) represents the first one-dimensional structure in Ag–borate iodides. Complete experimental characterizations, structural features, optical properties, and theoretical calculation analyses of (1) to (4) are presented in this work. This work provided a reference for the syntheses of new borates with diverse boron–oxygen blocks.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2014
·Vol. 57
·期 11
·2287-2294
·
IF 1.113
Yang AiLing,Wang YuJin,Li ShunPin,Bao XiChang,Yang RenQiang
By stepwise adding of reducer N 2 H 4 ·H 2 O, cuprous oxide (Cu 2 O) nanoparticles (NPs) with adjustable structures were synthesized. The features of Cu 2 O NPs were characterized by XRD, TEM and UV-Vis absorption spectra. When the reducer was added into the reactant system at one time, the sizes of the Cu 2 O NPs are in the range of 120–140 nm. Most Cu 2 O NPs are solid spheres. As the reducer was divided into two equal parts and stepwisely added, almost all the NPs are hollow spheres with good size (150–170 nm) distribution and dispersity. But when the reducer was divided into three or four equal parts and stepwisely added, the NPs are hollow spheres, core-shell structures or solid spheres, and the sizes distribution of the products is deteriorated. The effect of sodium hydrate (NaOH) was also probed. Addition of NaOH speeded up the nucleation and growth processes of Cu 2 O NPs. With the alkalinity increase, the shells of the hollow spheres become compact and the thicknesses of the shells increase, but the size distribution of the NPs is deteriorated. The absorption spectra of the Cu 2 O NPs are tunable. With the shell thicknesses increase, the absorption peaks have red shifts. An inside-outside growth model of Cu 2 O NPs was proposed to explain the results. The Cu 2 O single crystalline grains grow not only in the reactant solution, but also inside of the hollow nanospheres. The new Cu 2 O nanocrystallines can not only aggregate onto the shells of the nano hollow spheres, but also inside and outside of the hollow spheres, which leads to increasing the shell thicknesses of the hollow spheres, forming core-shell structures or small solid spheres of Cu 2 O NPs, respectively.
研究领域:
材料化学
·
纳米科学与技术
·
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 44
·4566-4571
·
IF 2.524
Wen-Dong Yao,Mei Yan,Xiao-Hui Li,Wenlong Liu,Ru-Ling Tang
Graphical A novel transition metal tellurite phosphate Cd 3 (PO 4 )(TePO 6 ) features a new type of {[TePO 6 ] 3− } ∞ chain was obtained by solid-state reactions, and its electronic structure and optical properties are studied systematically. New inorganic crystals containing multiple anions have received extensive attensions recently in view of their abilities to be potential multifunctional materials. Among them, tellurite-phosphates with simple chemical components are relatively rarely studied. Here, one novel tellurite phosphate Cd 3 (PO 4 )(TePO 6 ) was obtained through conventional soild-state reaction, and it is the first tellurite-phosphate only possessing d 10 transition metal. It crystallizes in the monoclinic space group P 2 1 / c , and its structure features an interesting {[TePO 6 ] 3− } ∞ chain constructed by corner-sharing connected PO 4 and TeO 4 tetrahedra. Meanwhile, we obtained a new phase of Cd 3 (PO 4 ) 2 and Cd 1.725 Mg 1.275 (PO 4 ) 2 in the exploration of tellurite-phosphates, and they also crystalize in the centric space group P 2 1 / c . Crystal structures, theoretical calculations on their electronic structure and birefringence have been studied, together with the IR and UV-vis-NIR diffuse reflectance spectra.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 36
·14440-14451
·
IF 4.5
Zhou Yuncheng,Xu Yuxing,Feng Hailan,Song Jiechen,Yan Mengxiao,Jian Haoyu,Zhuge Fuchang,Tan Qiangqiang
The Li-excess disordered rock salt cathode material, Li 1.2 Ni 0.2 Ti 0.6 O 2 , was synthesized via the sol–gel method to investigate the impact of different sintering temperatures on its structure, morphology, and electrochemical performance. X-ray diffraction (XRD) analysis revealed a cubic rock salt structure for the material. Raman spectroscopy indicated the presence of short-range-ordered domains of Li 2 TiO 3 and LiNiO 2 in the samples. The XPS results confirmed the existence of an oxygen vacancy structure on the sample’s surface. Morphological observations demonstrated that micron-scale secondary particles agglomerated with nanoscale primary particles, resulting in a nano-microstructure formation. Electrochemical testing conducted at room temperature within a voltage range of 1.5 ~ 4.8 V showed that the sample sintered at 600 °C exhibited the highest specific discharge capacity of approximately 304.4 mAh g −1 at 20 mA g −1 . The influence of surface structure on electrochemical properties in disordered rock salt cathode materials is elucidated through interactions between small primary particles and surface oxygen vacancies.
研究领域:
材料科学
·
电化学
·
无机化学
·
能源存储
·
固体化学
✓ 已验证
DOI
高影响因子
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
·
2018
·
IF 2.559
Peihai Li,Kun Zang,Yingjie Li,Changshui Liu,Qingjun Ma
Extracellular proteases are often produced as pre-pro-enzyme and then undergo multiple processing steps to mature into the active form. The protease Epp, a virulent factor of Vibrio anguillarum , belongs to this family. Its maturation might be regulated by Ca 2+ via its polycystic kidney disease (PKD) domain, but the molecular mechanism is unknown. Herein, we report the crystal structure of the first PKD domain from V. anguillarum Epp (Epp-PKD1) and its specific Ca 2+ -binding capacity. Epp-PKD1 exists as a monomer , consisting of seven β-strands which form two β-sheets stacking with each other. One Ca 2+ is bound by the residues Asn3, Gln4, Asp27, Asp29, Asp68 and a water molecule with a pentagonal bipyramidal geometry. Incubating the apo Epp-PKD1 with Ca 2+ but not Mg 2+ , Mn 2+ , or Zn 2+ , enhances the thermal and chemical stability of Epp-PKD1, indicating its specific binding to Ca 2+ . Epp-PKD1 shares high similarity in both sequence and overall structure with that of Vibrio cholerae PrtV, a homologous protease of Epp, however, they differ in the oligomeric state and local structure at the Ca 2+ -binding site, suggesting maturation of PrtV and Epp might be differently regulated by Ca 2+ . Likely, proteases may take advantage of the structural diversity in PKD domains to tune their Ca 2+ -regulated maturation process.
研究领域:
生物化学
·
结构生物学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2017
·Vol. 64
·期 4
·412-419
·
IF 0.935
Xiu-Yan Dong,Sunday Folaranmi Akogun,Wei-Min Zhou,Wen-Kui Dong
A new tetranuclear Zn(II) complex, [{Zn(L)(μ-OAc)Zn(H 2 O)} 2 ], based on an asymmetrical salamo-type bisoxime chelating ligand H 3 L (6-hydroxy-4′-chloro-2,2′-[ethylenediyldioxybis(nitrilomethylidyne)]diphenol) was synthesized and characterized by elemental analyses, differential thermal methods, single-crystal X-ray crystallography, and IR, UV–vis, and fluorescence spectra. The Zn(II) complex crystallizes in the triclinic system, space group P -1 with cell parameters a = 9.0742(6) Å, b = 11.8225(5) Å, c = 12.4182(8) Å, Z = 2, V = 1212.56(12) Å 3 , R 1 = 0.0572, and wR 2 = 0.1734. The environment of the tetranuclear Zn(II) complex is penta-coordinated having a slightly distorted trigonal bipyramidal geometry. Moreover, a 1D chain supramolecular structure is formed along the c -axis by the intermolecular C1–H1B⋯O14 hydrogen bonds; in the same manner, C2–H2C⋯Cg2 functions in the formation of supramolecular structures along the a -axis of the 1D chain. A 2D supramolecular structure along the ac plane extends infinitely under the force of intermolecular hydrogen bonds. Differential scanning calorimetry-thermogravimetry thermal analysis provides evidence of the coordination of Zn(II) atoms to the ligand H 3 L. The Zn(II) complex shows intense photoluminescence with a maximum emission at ~453 nm upon excitation at 360 nm.
研究领域:
无机化学
·
配位化学
·
超分子化学
·
材料化学
·
分析化学
·
物理化学
·
晶体学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 12
·10219-10226
·
IF 3.277
Sheng-Ping Guo,Yang Chi,Jian-Ping Zou,Huai-Guo Xue
A new phase of EuZrS3 (α phase) was obtained via a high-temperature solid-state reaction. It crystallizes in the orthorhombic space group Pnma with a = 8.465(3), b = 3.808(1), c = 13.823(4) Å and V = 445.5(2) Å3, belonging to the NH4CdCl3 structure type. Its crystal structure features a 3-D network constructed by EuS8 bicapped trigonal prisms (bctps) and Zr4+ ions that occupy the octahedral cavities. Ultraviolet-visible-near infrared band gap analysis shows an energy gap of 1.09 eV, which is verified by electronic band structure calculations. A typical photoluminescence phenomenon of Eu2+ can be observed at 575 nm. The photocatalytic behavior of rod-like α-EuZrS3 crystals was investigated by decomposing methylene blue under visible light and simulated sunlight irradiation.
研究领域:
材料科学
·
无机化学
·
固体物理
·
光催化
·
半导体材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2240-2249
·
IF 2.2
Shi Zitao,Li Shasha,Zheng Zeyu,Feng Xiaodong,Fang Zixuan,Yang Jun,Tang Bin
The rapidly developing field of wireless communication technology requires advanced microwave dielectric ceramic materials. Here, spinel-structured MgGa 2 O 4 and ZnGa 2 O 4 ceramics were prepared using a reaction sintering method. The effect of sintering temperature was investigated with respect to the crystal structure, microstructure, and microwave dielectric properties of MgGa 2 O 4 and ZnGa 2 O 4 ceramics. Rietveld refinement analysis and quality factor ( Q × f ) values suggested that the occupancy sites and percentage of cations in MgGa 2 O 4 would affect the microwave dielectric properties. Microstructure analysis indicated that abnormal grain growth at higher sintering temperatures would degrade the microwave dielectric properties of ZnGa 2 O 4 ceramics. MgGa 2 O 4 ceramics sintered at 1610°C exhibited promising microwave dielectric properties, i.e., ε r = 9.4, Q × f = 167,500 GHz, and τ f = −63 ppm/°C, while ZnGa 2 O 4 ceramics sintered at 1550°C possessed a higher ε r and a lower Q × f value of 10.5 and 126,900 GHz, respectively, and τ f = −60 ppm/°C. The τ f values of MgGa 2 O 4 and ZnGa 2 O 4 ceramics were tuned to near-zero levels by adding 8 mol.% CaTiO 3 . These results indicate that MgGa 2 O 4 and ZnGa 2 O 4 ceramics produced by reaction sintering show promise for applications in the field of 5G communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2021
·
IF 2.993
Zhigang Xu,Jingheng Du,Jun Wang,Zhihong Chen,Wenjun Li,Chuanbin Wang,Qiang Shen
In this work, CIP@SiO 2 , CIP@SiO 2 @ZrO 2 and CIP@void@ZrO 2 microspheres were fabricated as model samples of the core-single-shell, core-double-shell and yolk-shell absorbents to systematically compare the role of different coating structures for microwave absorption properties and offer a comprehensive reference to the rational structural design for microwave absorbents. Microstructures, magnetic properties, electromagnetic parameters and microwave absorption of different absorbents were studied. The electromagnetic absorption performance of the as-prepared multicomponent hierarchical microspheres was superior to the sole CIP, owing to the combination of strong magnetic loss of CIP core and excellent dielectric loss of SiO 2 and ZrO 2 shell. For core-double-shell CIP@SiO 2 @ZrO 2 microspheres, the minimum RL was −20.69 dB at 17.44 GHz with a thickness of 1.7 mm and the effective absorption bandwidth can reach 6.48 GHz at the coating thickness of 2 mm. It is noted that the initial oxidation temperature of CIP increased by ∼200 ℃ owing to the presence of dense SiO 2 intermediate layer. Inspiringly, the minimum RL of yolk-shell CIP@void@ZrO 2 microspheres was up to −28.38 dB at the absorber thickness of 2.2 mm and the effective absorption bandwidth reach 7.44 GHz from 10.24 to 17.68 GHz at 2.1 mm thickness. The yolk-shell structure had better absorbing performance than the core-shell structure because the cavity as the intermediate layer improved impedance matching. We believed that this work would provide a valuable reference for structural design and optimization of the high-performance absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Pan Xu,Hongru He,Jiyong Fang,Tiantian Shang,Shan Wang,Shuyuan Ge,Shuoqi Wu,Xigui Yue
A heterostructured polypyrrole@magnetic Co/CoFe 2 O 4 nanoparticles@hollow nanobowl-like carbon (PPy@Co/CoFe 2 O 4 @HNBC) composite with a layer-by-layer (LBL) structure based on HNBC was prepared via a facile three-step process. HNBC was synthesized by a typical template method, then sequentially decorated with Co/CoFe 2 O 4 and PPy via in-situ growth and polymerization. The relationship between the structure, components, and electromagnetic wave (EMW) absorption performance of PPy@Co/CoFe 2 O 4 @HNBC was studied in depth. The EMW absorbing research shows that PPy@Co/CoFe 2 O 4 @HNBC exhibits excellent EMW absorption capability, with a minimum reflection loss (RL min ) of up to −61.85 dB at 12.80 GHz and 1.90 mm and a widest effective absorption bandwidth (WEAB, RL≤−10.00 dB) value of 5.60 GHz at 1.70 mm. The excellent EMW absorption performance of PPy@Co/CoFe 2 O 4 @HNBC can be ascribed to the multiple reflection and scattering that occurs due to its unique microstructure and the synergistic effects between the polarization and conduction induced dielectric loss , and the natural resonance and exchange resonance induced magnetic loss. As a consequence, the PPy@Co/CoFe 2 O 4 @HNBC composite designed in this work is a hopeful candidate for application in the field of EMW absorption.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
DOI
高影响因子
iScience
·
2022
·
IF 6.107
Xiaoxiang Wen,Xuegang Lu,Jianing Li,Chaoping Wei,Hongji Qin,Yuting Liu,Sen Yang
In nature, many organisms (e.g., chameleons) protect themselves by changing their colors in response to environmental changes. Inspired by these organisms, we present a multi-responsive, flexible, and structurally colored hydrogel film with a one-dimensional (1D) ordered periodic groove structure. The groove structure endows the film with bright, highly angle-dependent structural colors, which can be reversibly tuned by stretching and releasing. In addition, because of the thermosensitive properties of the hydrogel, the film can be switched between colored state and opaque white state with temperature. In addition, the optical state of the film is sensitive to solvent and can be reversibly changed between colored state and transparent state with soaking and evaporation of the solvent. This reversible, multi-responsive, flexible, and structurally colored hydrogel film has great potential to be used in the fields of color display, sensors, anti-counterfeiting, and so on because of its flexible and diverse tuning methods, excellent optical performance, and convenient preparation process.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lili Yan,Min Zhang,Shichao Zhao,Tijian Sun,Bin Zhang,Maosheng Cao,Yong Qin
Yolk–shell and one-dimensional structures are promising microwave absorption structures due to the microwave multi-reflection and scattering sites of yolk–shell structure, and the conductive network that is easily formed by one-dimensional structure. The wire-in-tube structure may be a more effective microwave absorption structure because it combines the advantages of one-dimensional and yolk–shell structures. However, conventional methods are difficult to realize such a structure because of the weak controllability of the structure, and it is impossible to tune the absorption band or optimize the absorption performance by precisely tailoring the structure. Molecular layer deposition (MLD), with excellent structure controllability, is an effective strategy to overcome this problem. In this work, a novel wire-in-tube ZnO@carbon nanostructure was realized by polyimide MLD–calcination strategy. The ZnO cores and carbon shells form voids between them by a redox process during calcination, conducive to microwave multi-refection and scattering. More importantaly, by tuning the number of deposition cycles, the carbon shell thickness can be adjusted at the atomic scale so as to modulate the absorption bands effectively. Maximum absorption of −50.05 dB and a bandwidth of 5.68 GHz are simultaneously achieved at a matching thickness of 2.0 mm. The polyimide MLD–calcination strategy not only provides a novel wire-in-tube structure with remarkable microwave absorption performance, but diversifies carbonaceous material fabrication methods, extending the applications to supercapacitors, sensing, catalysis, and the biomedical fields.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）