JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 98
·期 2
·422-429
·
IF 1.745
Shaoqiang Zhang,Dong Tian,Geng Zhang,Lin He,Hua Zheng,Jun Hu,Yi Li,Minxia Liu,Yaohua Hu,Wei Zhang
Abstract The peculiar magnetic properties of superparamagnetic iron oxide nanoparticles (SIONs) have spurred great interest in their potential application in enhancing medical images and drug delivery. Currently hindering the application of nanomagnetic particles in these fields is due to SIONs nonuniform size distribution, agglomeration, non-crystallinity, and low magnetic moment. In this paper, magnetic nanocrystals of different sizes and morphologies were prepared by the solvothermal method, which utilized an n-hexane-surfactant system with Fe(acac) 3 and iron-powder precursors. The crystalline structure and particle size of grown SIONs are characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). HRTEM showed that the SIONs were approximately 5.6–6.8 nm in size with no agglomeration and a uniform distribution. Within the reaction time, HRTEM also confirmed that the shape and nanocrystals of SIONs had changed from an irregular crystal shape to triangles and quadrilaterals, and finally to hexagonal nanoparticles. According to the test results of the magnetic properties test and the literature, the material that has been synthesized is a superparamagnetic material. And the maximum saturation magnetization was 62.65 emu/g, which is reported among the largest magnetic properties of SIONs at a size of 6.8 nm.
Superparamagnetic Fe 3 O 4 nanoparticals with different size and morphology were prepared by solvothermal method in N-hexane-surfactant system with the precursors of Fe(acac) 3 and iron powder. With the increasing reaction time and under the regulation of the surfactant molecules, the morphology and nanocrystals of SIONs have initially changed from the irregular crystal to triangles and quadrilaterals shape, and finally to the hexagonal nanoparticles.
研究领域:
生物医学工程
·
纳米材料科学
·
磁性材料
·
药物输送系统
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Xinghao Han,Bin Liu,Zhihong Wang,Alexander Ross Craze,Hongxia Sun,Misbha Rafiq Khan,Jing Liu,Zhongyi Liu,Jinpeng Li
Based on asymmetric lithium salts of 1-(2-pyridinylmethyl)-pyrazole-3,5-dicarboxylate (2-Li 2 pmpd) or 1-(4-pyridinylmethyl)-pyrazole-3,5-dicarboxylate (4-Li 2 pmpd), four polymers [Mn(2-pmpd)(H 2 O)] n (1), {[Mn 2 (4-pmpd)(pd)(H 2 O) 3 ]·H 2 O} n (2), [Co(4-pmpd)(H 2 O)] n (3) and [Co(2-pmpd)(H 2 O) 2 ] n (4) [pd = pyrazole-3,5-dicarboxylate] have been hydrothermally prepared and characterized structurally. 1 displays three-dimensional (3D) network with (4 4 .8 4 ) topology, 2 and 3 show 2D framework with (4 2 ·5·6 3 )(4 2 ·5 2 ·6 4 ·7 2 )(5 2 ·8) and (4 3 ) 2 (4 6 ·6 6 ·8 3 ) topologies, respectively. 4 is a 1D chain structure. Magnetization data of 1 with the 1D carboxylate bridges chain structure, fitted by the 1D model, suggests the antiferromagnetic coupling with J = −2.07 cm −1 . The carboxylate bridges in 1 adopt common syn - syn and unidentate oxygen-bridge modes. 2 with the Mn 4 unit, exhibits antiferromagnetic coupling with J = −0.68 cm −1 and z J ′ = −0.317 cm −1 . The carboxylate bridges in 2 adopt common syn - anti and the unidentate oxygen-bridge modes. In the Co 2 units, magnetization data for 3 shows the weak antiferromagnetic coupling. Variable temperature magnetic studies of 4 reveal ferromagnetic intrachain interactions and antiferromagnetic interchain magnetization interactions. The M ( H ) curves for 3 and 4 are consistent with their antiferromagnetic or ferromagnetic natures.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Yang Xie,Yingzhe Na,Fengying Chen,Yikun Zhang
In this work, we prepared the single-phased Gd 11 GeP 3 O 26 oxide by solid-phase reaction method and experimentally characterized its structure, magnetic and MC properties. The Gd 11 GeP 3 O 26 oxide is found to be crystallized in triclinic structure ( P 1 space group) and its constituting elements show excellent homogeneity and with the valence state of Gd 3+ , Ge 4+ , P 5+ and O 2− , respectively. The Gd 11 GeP 3 O 26 oxide orders magnetically around 2.78 K and possesses remarkable cryogenic MC responses. The maximum magnetic entropy changes/temperature-averaged magnetic entropy change (5 K-lift) and relative cooling powers in Gd 11 GeP 3 O 26 oxide are 32/29.4 J/kgK and 404.4 J/kg under magnetic field variation 0–7 T, respectively. These MC parameters are comparable to most acquired RE -based magnetic oxides suitable for cryogenic application, making present Gd 11 GeP 3 O 26 oxide of interest for magnetic cooling application.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Ming-Yuan Yan,Xiao-Yu Zhang,Li-Huai Shu,Li-Da Chen,Jian Guo,Yu Xing,Ji Zhang,Feng-Zhen Huang,Shan-Tao Zhang
Rare-earth titanate pyrochlores have attracted considerable attention for their unique magnetic frustration. Among those compounds, Yb2Ti2O7, a candidate for quantum spin ice, has been extensively studied in its magnetic ground state. However, works on its dielectric property and structure-property relationship lag far more behind. Here, by preparing and investigating nonstoichiometric Yb2–xTi2O7−δ (x = 0–0.15) ceramics, we demonstrate that the samples with x ≤ 0.05 maintain a single-pyrochlore phase, but the nonstoichiometry arouses significant structural distortion and increased oxygen vacancy. As a result, the ferromagnetism, indicated by a positive Curie-Weiss temperature, decreases almost linearly with increasing x value. Remarkably composition-dependent low-temperature dielectric relaxations have been observed. In addition, through introducing nonstoichiometry, the relaxor degree of dielectric behavior is enhanced, and the dielectric curve shows an altered shape. The origin of this dielectric relaxation is attributed to the increased structural distortion reflected by the changed bond length/angle, since there is no phase transition in 90–300 K. Our work gives a comprehensive view on the structural, magnetic, and dielectric properties of Yb2Ti2O7, which is instructive for further work on pyrochlores.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Quanyi Liu,Junfeng Wang,Huicai Xie,Qi Fu,XinQiang Gao,Zhenxing Li,JinLiang Zhao,Zhaojun Mo
A modified solid-phase reaction method was used to synthesize the polycrystalline Eu 3 B 2 O 6 -as a novel cryogenic magnetocaloric material. In addition, investigations into the magnetocaloric effect (MCE), magnetic properties and crystal structure of compound have been precisely completed. The results indicate that the compound undergoes a second-order magnetic-phase transition from ferromagnetic to paramagnetic at 8 K and has a hexagonal structure that belongs to the R-3c space group. Meanwhile, the MCE was evaluated by using magnetic entropy change (-Δ S M ), temperature averaged entropy change ( TEC ) as well as the refrigeration capacity ( RC ) for Eu 3 B 2 O 6 . Under the field change from 0 to 5 T, the maximal values of -Δ S M and TEC (5) are 38.6 and 35.7 J kg −1 K −1 , respectively, while the corresponding RC reaches 435.9 J kg −1 . The giant low-field MCE facilitates device miniaturization and cost reduction, making Eu 3 B 2 O 6 compound a promising candidate for cryogenic magnetic refrigeration.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 29
·5569-5578
·
IF 4.034
Ai-Xiang Tian,Ya-Li Ning,Jun Ying,Guo-Cheng Liu,Xue Hou,Tian-Jiao Li,Xiu-Li Wang
By using two kinds of organic ligands (1-benzyl-1H-(1,2,4)triazole (2-btz) and 1-benzyl-1H-(1,3,4)triazole (3-btz)), six polyoxometalate (POM)-based compounds were hydrothermally synthesized and structurally characterized, [Ag4(2-btz)4(HPMo2VMo10VIO40)] (1), [Ag4(2-btz)4(SiW12O40)] (2), [Ag4(2-btz)5K(SiWVW11VIO40)]·13H2O (3), [Cu4(2-btz)16(Mo8O26)2] (4), [Cu3(3-btz)8(H2O)4](PMo12O40)2·4H2O (5) and [Cu7(3-btz)16(OH)2(H2O)4(P2W18O62)2]·16H2O (6). Compounds 1 and 2 are isostructural with two sets of Ag–(2-btz) chains linked by Keggin anions to construct a “ladder”. Adjacent “ladders” are further connected by Ag1–O13 bonds to build a 3D framework. In compound 3, the anion dimers are linked by Ag5–O9 bonds to form a 1D chain. The chains are fused by Ag3 and K ions and a 3D framework of 3 is built. In compound 4, the Mo8 anions are linked by [Cu(2-btz)4]2+ subunits to construct a 3D structure. By changing 2-btz to 3-btz, we obtained a linear tri-nuclear cluster [Cu3(3-btz)8(H2O)4]6+ in compound 5. The discrete PMo12 anions combine with tri-nuclear clusters through hydrogen bonding interactions to construct a 2D supramolecular layer. Compound 6 contains a cycle tri-nuclear cluster-supporting anion [Cu3(3-btz)6(OH)(H2O)2(P2W18O62)]−, which is further connected by one [Cu(3-btz)4]2+ subunit to construct a discrete anion dimer. The title compounds show good electrocatalytic activities for reducing nitrite, hydrogen peroxide and bromate. These compounds also exhibit excellent photocatalytic activities for the degradation of methylene blue (MB, 1–6 as catalysts) and Rhodamine B (RhB, 5 and 6 as catalysts). Additionally, the magnetic properties of compounds 5 and 6 have been investigated.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2012
·
IF 4.601
Wenlong Yin,Kai Feng,Wendong Wang,Youguo Shi,Wenyu Hao,Jiyong Yao,Yicheng Wu
The twelve quaternary rare-earth selenides Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) have been synthesized for the first time. The compounds Ba2GaLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) are isostructural and crystallize in a new structure type in the centrosymmetric space group P1̅ of the triclinic system while the isostructural compounds Ba2InLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) belong to the Ba2BiInS5 structure type and crystallize in the noncentrosymmetric space group Cmc21 of the orthorhombic system. The structures contain infinite one-dimensional anionic chains 1∞[GaLnSe5]4– and 1∞[InLnSe5]4–, and both chains are built from LnSe6 octahedra and MSe4 (M = Ga, In) tetrahedra in the corresponding selenides. As deduced from the diffuse reflectance spectra, the band gaps of most Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) compounds are around 2.2 eV. The magnetic susceptibility measurements on Ba2GaGdSe5 and Ba2InLnSe5 (Ln = Nd, Gd, Dy, Er) indicate that they are paramagnetic and obey the Curie–Weiss law, while the magnetic susceptibility of Ba2InSmSe5 deviates from the Curie–Weiss law as a result of the crystal field splitting. Furthermore, Ba2InYSe5 exhibits a strong second harmonic generation response close to that of AgGaSe2, when probed with the 2090 nm laser as fundamental wavelength.
研究领域:
材料科学
·
固体化学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Shaobo Shi,Yu Yang,Jianping Xu,Lan Li,Xiaosong Zhang,Guo-Hua Hu,Zhi-Min Dang
Zn 1− x Co x O (0 ⩽ x ⩽ 0.06) nanorods were fabricated by hydrothermal method. The effect of Co doping on the morphology, crystalline structure, optical and magnetic properties of the samples was investigated. The length of obtained ZnO nanorods increases with the increasing Co concentration. Based on the results of X-ray diffraction and Raman spectra, it is confirmed that a small amount of Co ions are incorporated into ZnO lattice. The segregated phase of Co 3 O 4 was detected at x > 0.01. The absorption and photoluminescence spectra reveal the d–d electronic transitions of tetrahedrally coordinated Co 2+ in ZnO host. Co doping induces fluorescent quenching of the visible emission bands related to surface states and defect states in the Co-doped ZnO nanorods. Weak room temperature ferromagnetism was observed in the samples with x = 0.01 and then paramagnetic characteristics of the samples with x > 0.01.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Wenhao Zhang,Meiyan Cui,Zhiying Zhao,Tianyu Zhu,Zhangzhen He
Based on the crystal structure of A2Cu5(TeO3)(SO4)3(OH)4 (A = Na, K), two new compounds ACo5(SeO3)4(OH)2F (A = Rb, Cs) have been synthesized by introducing F− ions, achieving the extension from a one-dimensional kagomé strip lattice to a distorted 2-uniform lattice (T29). Magnetic measurements indicate that RbCo5 exhibits antiferromagnetic order at low temperatures, while CsCo5 shows canted antiferromagnetic behavior. Both compounds display a field-induced magnetic transition at their respective critical fields. To the best of our knowledge, this is the first reported synthesis of compounds with a distorted 2-uniform lattice (T29).
研究领域:
材料科学
·
固体物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2016
·Vol. 26
·期 2
·413-422
·
IF 1.308
Guo Haifu,Lei Jiamei,Qin Liang,Liang Yunqiu,Yan Jingjing,Lin Weijie,Ding Wanqiu,Sakiyama Hiroshi,Liu Jianqiang,Ma Deyun
By changing the metal salts, two new transition metal-based coordination polymers (CPs), {[Co 3 (DBA) 3 (dmbpy)]·(DMF)·(H 2 O) 4 } n ( 1 ), and {[(Me 2 NH 2 ) 2 Cd(DBA) 2 ]·(DMF) 3 } n ( 2 ) ((H 2 DBA = 4,4′-methylenedibenzoic acid, dmbpy = 3,3′-dimethyl-4,4′-bipyridine) has been synthesized under the same reaction conditions (DMF and 130 °C) and were structurally characterized. Both compounds are synthesized using dual linkers (H 2 DBA and dmbpy). 1 performs a 2-fold interpenetration 3D framework with pcu topology and is stable in aqueous solutions at pH range from 5 to 9, whereas 2 shows a 2D (4,4) network and is unstable in air. Furthermore, the magnetic and 3D luminescent properties of 1 and 2 are also investigated, respectively. The results suggest that metal salts influence on the final resulting CPs and the introduction of water repellent functional groups within the structure can largely enhance the hydrophobic properties of CPs.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 6
·1451-1458
·
IF 1.174
Yu Xiaoke,Weng Wandan,Guo Xiaxia,Zheng Yueqing
Two polymeric carboxylato-bridged manganese(II) complexes, \( {}_{\infty }^{1} \) [Mn(bpe)(NBA) 2 ] ( 1 ) and \( {}_{\infty }^{1} \) [Mn(bpe)(MBA) 2 ] ( 2 ) (bpe = 1,2-di(4-pyridyl)ethylene; HNBA = m-nitrobenzoic acid; HMBA = m-methyl-benzoic acid), were synthesized and characterized. Compounds 1 and 2 are isostructural. X-ray diffraction studies show that the title compounds possess a double chain structure. The chains in 1 and 2 are assembled into 2-D layers via C–H···O hydrogen bonds interactions. Furthermore, owing to the offset face-to-face π–π stacking interactions, the adjacent 2-D layers embed into each other to form a 3-D supramolecular framework. Variable-temperature (2–300 K) magnetic susceptibility measurements show the presence of weak antiferromagnetic interactions between the high-spin Mn(II) (S = 5/2) ions through a carboxylato bridge with the best fit parameters for 1 being J = −0.13 cm −1 , zJ′ = −0.098 cm −1 and for 2 , J = −0.33 cm −1 , zJ′ = −0.001 cm −1 .
研究领域:
配位化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yi Yang Xu,Lei Meng,Miao Miao Zhao,Chu Xin Peng,Fei Yen
While all of the polymorphs of pure NH 4 I and KI are non-polar, we identify that (NH 4 ) 0.95 K 0.05 I is ferroelectric and (NH 4 ) 0.87 K 0.13 I and (NH 4 ) 0.83 K 0.17 I are pyroelectric through measurements of their pyroelectric current and complex dielectric constant. The order to disorder phase transitions occur near 245 K. Magnetic susceptibility measurements indicate that the proton orbitals of the NH 4 + continue to become ordered in the ground state in the (NH 4 ) 1–x K x I system up to x ≤ 0.17. The polar phases are proposed to stem from K + ions disrupting the symmetry of proton-orbital-lattice interactions between the NH 4 + and I – ions. Our work introduces a new pathway for the ordered phases of ammonium-based compounds to potentially become ferroelectric.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）