Nanomaterials
·
2024
·Vol. 14
·期 10
·834
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IF 4.4
Yuntian Du,Pengxiang Zhang
The value of two-dimensional (2D) materials in printed electronics has been gradually explored, and the rheological properties of 2D material dispersions are very different for various printing technologies. Understanding the rheological properties of 2D material dispersions plays a vital role in selecting the optimal manufacturing technology. Inkjet printing is suitable for small nanosheet sizes and low solution viscosity, and it has a significant advantage in developing nanosheet inks because of its masklessness, high efficiency, and high precision. In this work, we selected 2D Ti0.8Co0.2O2nanosheets, which can be synthesized in large quantities by the liquid phase exfoliation technique; investigated the effects of nanosheet particle size, solution concentration on the rheological properties of the dispersion; and obtained the optimal printing processing method of the dispersion as inkjet printing. The ultrathin Ti0.8Co0.2O2nanosheet films were prepared by inkjet printing, and their magnetic characteristics were compared with those of Ti0.8Co0.2O2powder. The films prepared by inkjet printing exhibited long-range ordering, maintaining the nanosheet powders’ paramagnetic characteristics. Our work underscored the potential of inkjet printing as a promising method for fabricating precisely controlled thin films using 2D materials, with applications spanning electronics, sensors, and catalysis.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2017
·
IF 3.887
Yehong Wu,Zhiyong Jiang,Xingjie Zan,Yuan Lin,Qian Wang
Controlling the alignment of anisotropic nanoparticles within a three-dimensional (3D) environment over large-scale is still a challenge. In this paper, a facile method to align rod-like nanoparticles in hydrogel via shear flow to afford a long-range order is reported. The rod-like tobacco mosaic virus (TMV) was employed as a prototypical anisotropic particles in the study, and the shear force provided by the unidirectional flow of the precursor solution direct the alignment of TMVs, which could be quickly fixed through the fast sol-gel transition in situ . The degree of orientation and the distance between the TMV particles could be regulated by adjusting the concentration of hydrogels and TMVs. While the introduction of TMVs could reduce the degree of swelling of the hydrogel and help maintaining the mechanical strength of resultant hydrogels, both repulsion interaction and shear flow contributed synergistically to the assembly. This method does not require the usage of strong magnetic or electric fields, nor does it require the use of specialized lithography, thus offers a facile way to the fabrication of hydrogel materials with control of anisotropic structural features.
研究领域:
生物材料学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Fengqiong Tao,Chaoping Liang,Xiaoming Wang,Xiaohui Li,Florence Porcher,Mathieu Allix,Fengqi Lu,Haoran Gong,Laijun Liu,Xiaojun Kuang
A new 8-layer shifted hexagonal perovskite Ba8MnNb6O24 has been synthesized in air, featuring unusual long-range B-cation ordering with single octahedral high-spin d5 Mn2+ layers separated by ∼1.9 nm within the corner-sharing octahedral d0 Nb5+ host, analogous to Ba8(Zn/Co)Nb6O24. The large size and charge differences between high-spin Mn2+ and Nb5+, as well as the out-of-center distortion of NbO6 octahedra associated with the bonding covalence and second-order Jahn–Teller effect of Nb5+, drive long-range cationic ordering, thus stabilizing Ba8MnNb6O24. The Ba8MnNb6O24 pellet exhibits a high dielectric permittivity, εr ∼ 38, and a large temperature coefficient of resonant frequency, τf ∼ 20 ppm/K, but a dielectric loss (Qf ∼ 987 GHz) and conductivity (∼10–8–10–3 S/cm within 473–1173 K) much higher than those of Ba8ZnNb6O24. Electronic structures from density functional theory calculations reveal that Ba8MnNb6O24 is a Mott insulator in contrast with the charge-transfer insulator nature of Ba8ZnNb6O24, and they confirm that the off-center distortion of Nb5+ contributes to stabilization of the 8-layer ordered shifted structure. The contrast between conductivity and dielectric loss of Ba8MnNb6O24 and Ba8ZnNb6O24 is understood based on the electronic structure that depends on high-spin d5 Mn2+ and d10 Zn2+ cations. The hopping of 3d valence electrons in high-spin Mn2+ to Nb5+ 4d conduction bands over a small gap (∼2.0 eV) makes Ba8MnNb6O24 more conductive than Ba8ZnNb6O24, where the electrons are conducted via the hopping of a lattice O 2p valence electron to the Nb5+ 4d conduction bands over a larger gap (∼3.9 eV). The high microwave dielectric loss of BMN may be mainly ascribed to the half-filled Mn 3d orbits, which is understood based on the softened infrared modes that increase the lattice vibration anharmonicity as well as the resonant spin excitation of unpaired d electrons.
研究领域:
材料科学
·
固体物理
✓ 已验证
DOI
PubMed
高影响因子
ACS Nano
·
2019
·
IF 13.903
Nan Yan,Xuejie Liu,Jintao Zhu,Yutian Zhu,Wei Jiang
Precise control over the spatial arrangement of inorganic nanoparticles on a large scale is desirable for the design of functional nanomaterials, sensing, and optical/electronic devices. Although great progress has been recently made in controlling the organization of nanoparticles, there still remains a grand challenge to arrange nanoparticles into highly-ordered arrays over multiple length scales. Here, we report the directed arrangement of inorganic nanoparticles into arrayed structures with long-range order, up to tens of microns, by using hexagonally-packed cylindrical patterns of block copolymer nanosheets self-assembled within collapsed emulsion droplets as scaffolds. This technique can be used to generate nanoparticle arrays with various nanoparticle arrangements, including hexagonal honeycomb structures, periodic nanoring structures, and their combinations. This finding provides an effective route to fabricate diverse nanoparticle arrayed structures for the design of functional materials and devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tianze Wang,Hui Chi,Danying Zhao,Qitong Wang,Zhenhua Jiang,Yunhe Zhang
In recent years, boron nitride nanosheets (BNNS) have been widely used in the development of polymer-based thermal interface materials (TIM) due to their excellent thermal conductivity and electrical insulation. However, the thermal performance of these TIMs is still unsatisfactory, mainly because BNNS do not connect effectively in the polymer matrix. The lamellar structure of a crepe cake in life provides inspiration for the design of this study. In this study, TIM with long-range ordered structure was prepared by using the freezing process guided by double temperature gradient. The long-range ordered structure forces BNNS to be tightly connected and highly oriented between polymer layers, thus providing long-range conduction paths for phonons. The composite prepared by this strategy exhibits excellent in-plane thermal conductivity (10.4 W/(m·K)), volume resistivity, tensile strength and thermal stability at only 20 vol% BNNS loading, which makes it has a broad application prospect in the field of electronic device packaging. In addition, the strategy provided by the study can not only be applied to the development of thermal conductivity composites, but also can be extended to different material combinations of various functional composites.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Fucheng Guan,Zheng Li,Jun Tian,Yihang Zhang,Jianbing Sun,Jing Guo,Yuanfa Liu
Biomass-based aerogel fibers have attracted increasing attention due to their renewable nature. However, their disadvantages, such as low mechanical strength, poor long-range order, and easy combustion, are still significant challenges. Herein, a directed freezing-assisted forced stretching strategy is developed to fabricate sheath-core structured Ca-alginate/polyvinyl alcohol (Ca-A/PVA) aerogel fibers with Long-range-ordered pores. The Ca-A/PVA aerogel fibers (3:2 m/m) exhibit the best comprehensive mechanical properties in terms of low thermal conductivity of 0.0524 W·m −1 ·K −1 , a density of 0.1614 g·cm −3 , a porosity of 89.9 %, a tensile strength of 8.72 MPa, a tensile modulus of 249.7 MPa, a toughness of 1.98 MJ∙m −3 , and a self-extinguishing time from the fire of <1.2 s. The Ca-A/PVA fabrics showed a maximum absolute temperature difference of 11.4 °C at −20 °C and 14.0 °C at 60 °C compared to the plate temperature. The presented strategy is generalizable to other alginate-based aerogel fibers (e.g., alginate/guar gum).
研究领域:
材料科学
·
生物质材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Synthesis
·
2024
·
IF 0
Liu Hong,Wu Haodong,Zhou Zezhu,Ren Lizhi,Yang Yi,Zhang Aiping,Qian Jin,Priya Shashank,Poudel Bed,Liu Chang,Yang Dong,Wang Kai,Wu Congcong
Combining mechanical and chemical effects during the synthesis of crystals can lead to unexpected material attributes. The role of mechanical effects during the wet chemical synthesis of halide perovskite remains insufficiently explored, mainly due to its temporal asynchronization with the typical slower solvent evaporation-motivated chemical changes. Here we introduce stress from mechanical shearing into a short temporal window of crystal synthesis by using a fast-crystallizing precursor ink, which causes mechanical shearing effects to occur simultaneously with the atomic assembly of perovskite. This protocol allows macroscopic dynamic shearing to impact the atomic lattice rearrangement, growth and facet orientation. Such an effect is consistently observed across atomic to centimetre scales, culminating in films with long-range uniformity. These perovskite films exhibit exceptional crystalline orientation and structural uniformity, demonstrating a Herman’s orientation factor of −0.3135 and leading to a remarkable power conversion efficiency of 25.90% on small-area cells and exceeding 21% in a 70 cm 2 solar module. This synthetic approach exemplifies the use of mechanical shearing to foster the assembly of long-range-ordered crystallographic lattices, thereby providing a scalable synthesis for high-quality perovskite films.
研究领域:
材料科学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zhongyan Gu,Ning Liu,Yudong Cheng,Yongpeng Wu,Chunhua Sun,Pengxu Chen,Fei Pan,Xiang Li,Wei Lu
Binary nanocrystals superlattices with the atomic long range ordered array of different colloidal nanocrystals are deemed as potential electromagnetic wave absorption (EWA) materials in dealing with current electromagnetic radiation problem, as their inherent superiority stems from the cooperative effect of adjacent units and strong interfacial coupling. However, relevant researches remain underdeveloped due to daunting synthetic challenges and complex electromagnetic regulation mechanism. Here, nanocarbon-bridged 2D-2D MXene superlattice with tunable vacancy defects are prepared via molecular ligands induced self-assembly and subsequently nitrogen-doped pyrolysis strategy, which resulted in “carbon-MXene-carbon-rGO-carbon” architecture. Such a periodic ordered & nano-bridging structure optimize axial charges transport over Van der Waals gap and suppressed interface formation between identical components, thereby boosting the charges localization and delocalization. Meanwhile, nitrogen doping further induce abundant Ti atom and Ti sub-nm clusters vacancy defects, together with generation of diverse dipole polarization centers. The synergistic effects of two mechanisms enabled programmable regulation of sum (ε'+ε'') and quotient (ε''/ε') of permittivity into predicted window required for low matching thickness, resulting in predictable EWA performance (1.5 mm, −56.3 dB). This work provides a versatile strategy for fabrication of atomic long range ordered heterostructures, paving the way for the development of absorbers via structural rearrangement and surface modification.
研究领域:
材料科学
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纳米技术
·
电磁学
·
凝聚态物理
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2017
·
IF 6.337
Fei An,Xiaofeng Li,Peng Min,Hongfei Li,Zhen Dai,Zhong-Zhen Yu
Although graphene aerogels have great potentials in preparing heat dissipation composites on the basis of their continuous thermally conducting networks, their low density and isotropic architecture hinder further improvement of the thermal conductivity of their composites. Herein, highly anisotropic graphene/boron nitride (BN) hybrid aerogels with a long-range ordered architecture and moderate density are prepared for the first time by hydrothermally treating the suspension of graphene oxide sheets and BN nanoplatelets , air-drying the resultant hydrogels, and thermally annealing the highly anisotropic aerogels at 2000 °C. During the hydrothermal treatment , the chemically reduced graphene oxide (RGO) sheets are self-assembled into the highly anisotropic and long-range ordered network, while the BN nanoplatelets are distributed between the aligned RGO sheets to prevent the excessive volume shrinkage of the aerogel and retain its anisotropic porous structure with high porosity during the air-drying. Furthermore, the RGO/BN hybrid aerogel is thermally annealed at 2000 °C to fully remove the residual oxygen-containing groups and heal the defects on its RGO component. The thermally annealed hybrid aerogel is highly efficient in enhancing the thermal conductivity of epoxy resin , and the resultant composite exhibits an ultrahigh through-plane thermal conductivity of 11.01 W/(mK) with an excellent thermal conductivity enhancement of 277%.
研究领域:
材料科学
·
纳米技术
·
热管理
·
复合材料
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xin Li,Zhenhang He,Zhen Liu,Yu Chen,Zekun Zhou,Guixiang Chen,Weiheng Qi,Daniel Rauber,Christopher W. M. Kay,Peng Zhang
In this work, post-treatment-free polymer hybrids, consisting of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and ionic liquids (ILs), were fabricated for the thermoelectric (TE) application. By optimizing the ILs’ molar concentration (0–0.5 M) and chemical composition, that is varying the cyano-based anions coupled with 1-ethyl-3-methylimidazolium cations, a high TE performance (power factor of 190 μW m −1 K −2 ) was achieved. The excellent TE performance was attributed to the conductive network under the coupling effect of molecular structure (such as oxidation level, conformation and crystallization of PEDOT chains) and microstructure (long-range ordered conductive paths). Especially, the long-range conductive paths were proved to be made of rod-like microdomains, based on detailed structure analysis with micro-Fourier transform infrared spectroscopy and small-angle X-ray scattering. These paths enabled carrier transport among microdomains of PEDOT:PSS/IL hybrids. Moreover, the conductive network of PEDOT:PSS/IL hybrids showed good environmental and mechanical stability, enabling the fabrication of flexible TE generators.
研究领域:
材料科学
·
热电学
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Alimujiang Yalikun,Yanhong Wang,Yun Lv,Yaling Dou,Hyun-Joo Koo,Jiaojiao Cao,Wei Qi,Keke Huang,Myung-Hwan Whangbo,Zhongwen Ouyang,Hongcheng Lu
A series of analogous chain selenite chlorides Ba2M(SeO3)2Cl2 (M = Cu 1, Ni 2, Co 3, Mn 4) and Pb2Cu(SeO3)2Cl2 5 with tunable spin S from S = 1/2 to S = 5/2 have been hydrothermally synthesized and characterized. These analogues crystallized in the orthorhombic Pnnm space group (monoclinic P21/n space group for 5) all containing M2+–SeO3–M2+ spin chains, which are further separated by the Ba2+ ions (Pb2+ for 5). The magnetic susceptibility results of 1, 2, and 5 show broad maxima around 80.0, 18.9, and 78.0 K, respectively, indicating good one-dimensional (1D) magnetism. Meanwhile, no long-range order (LRO) is observed down to 2 K for both 1 and 5, while the isostructural compounds 2, 3, and 4 exhibit LRO at 3.4 K, 10.8 K, and 5.7 K, respectively, which are further confirmed by the heat capacity and electron spin resonance results, as well as the observed spin-flop transitions in the M–H curves measured at 2 K below TN. The magnetizations of 1–5 at 7 T are still far from saturation. In addition, thermal stability and FT-IR and UV–vis–NIR spectroscopy of 1–5 are reported.
研究领域:
无机化学
·
材料科学
·
固体物理
·
磁学
·
晶体学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）