ACS Applied Polymer Materials
·
2023
·
IF 5
Yanyan Wang,Shuaishuai Liu,Chao Xiao,Miao Jiang,Xin Ding,Hui Zhang,Kang Zheng,Lin Chen,Xingyou Tian,Xian Zhang
Polyimide (PI) films with high out-of-plane thermal conductivity are highly desirable for effectively alleviating thermal failure in advanced flexible electronics. However, it is still a great challenge to achieve high out-of-plane thermal conductivity with a low filler content by a simple method. Herein, an Ag-coated PI microsphere (PIM@Ag) as a thermally conductive filler with a considerable heat-transfer path in the out-of-plane direction is prepared to improve the out-of-plane thermal conductivity of the PI film. Because of the introduction of thermal welding between Ag nanoparticles during thermal imidization further eliminating the interface thermal resistance, the resultant PI/PIM@Ag composite film exhibits a high out-of-plane thermal conductivity of 1.2 Wm–1K–1 with an ultralow Ag content of 6.08 wt % and a superior tensile strength of 124.0 MPa compared to 78.9 MPa of a pure PI film. Practical application and comsol simulation results verify that the PI/PIM@Ag composite film has excellent heat dissipation ability for a chip. This work provides an idea for improving the out-of-plane thermal conductivity of polymers with low filler contents.
研究领域:
材料科学
·
电子工程
·
热传导
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yuan Niu,Chao Xiao,Mengyue Hu,Xianglan Liu,Xin Ding,Meng Xue,Xingyou Tian,Kang Zheng,Xian Zhang
The power density of flexible electronics, foldable devices and wearable devices is becoming increasingly high, posing higher requirements for the out-of-plane thermal conductivity of flexible substrates. This paper reports a polyimide (PI) film with excellent out-of-plane thermal conductivity and flexibility prepared with homemade hexagonal alumina (h-Al 2 O 3 ) flakes. With higher crystallinity, more regular geometry and larger diameter-thickness ratio, self-prepared h-Al 2 O 3 is more likely to lap out-of-plane to form a continuous and efficient heat conduction network. The PI/ h-Al 2 O 3 composite film exhibits higher thermal conductivity than that of PI/commercial spherical alumina (c-Al 2 O 3 ) composite film at the same mass fraction. The out-of-plane thermal conductivity of the PI composite film loaded with 40 % h-Al 2 O 3 reaches 1.53 Wm −1 K −1 , 1.91 times higher than that of PI/ c-Al 2 O 3 composite film (0.80 Wm −1 K −1 ). Additionally, PI/h-Al 2 O 3 composite film exhibits excellent electrical insulation, high flexibility and enhanced thermal stability. This work provides an effective method to address the deficiency of out-of-plane thermal conductivity of PI film.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Qinghua Hu,Xue Bai,Chenxu Zhang,Xiaoliang Zeng,Zhengyong Huang,Jian Li,Junwei Li,Yuexing Zhang
Polymer composites with high out-of-plane thermal conductivity , flexibility, and low modulus have always been one of the ideal thermal interface materials . Using softer polymer composites can reduce thermal contact resistance and stress caused by the mismatch of the coefficient of thermal expansion, as well as heat can be quickly transferred due to its high out-of-plane thermal conductivity. Herein, we report a silicone rubber-based composites with high out-of-plane thermal conductivity and softness prepared by combining shear orientation and layer-by-layer stacking methods. The composites exhibit an out-of-plane thermal conductivity of 7.62 Wm -1 K −1 , while maintain the flexibility and high elastic recovery of silicone rubber. According to finite element simulation analysis, the increase in thermal conductivity comes from the orientation of the BN flakes and the formation of the thermal network. This work provides a simple method for the preparation of flexible thermal interface materials with high out-of-plane thermal conductivity for many potential applications.
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Song Zuo,Maohua Li,Shaoxiong Xie,Jinpeng Luo,Lexiang Xu,Yan Shi,Ningxiang Lan,Lang Zhou,Jinhong Yu,Xiaomin Li,Chuanqiang Yin
Boron nitride nanosheet (BNNS) is widely used in electronic thermal management due to its excellent planar thermal conductivity and insulating properties. However, it is challenging to improve the out-of-plane thermal conductivity of BNNS-doped composites due to the anisotropy of the thermal conductivity of BNNS. Therefore, the BNNS in the matrix must be oriented to obtain composites with high out-of-plane thermal conductivity. In this study, BNNS powders with directional structures were synthesized directly using sodium chloride templates. The as-obtained BNNS powders have a unique hollow cube-like structure with an ultra-low density of 2.67 × 10 −2 g/cm 3 and nearly 8 times the volume of the same mass of two-dimensional (2D) BNNS, making it easy to form the out-of-plane thermal conductivity paths in the polymer matrix . In addition, the high out-of-plane thermal conductivity of 4.93 W m −1 K −1 at 23.3 wt% loadings was obtained by doping it into a polyimide (PI) matrix. This value is 9.7 times higher than that of 2D BNNS-doped PI at the same loadings, 17.6 times higher than pure PI, and 6.1 times higher than the thermally conductive PI film sold by DuPont. Therefore, the prepared composite film has great potential for application in electronic thermal management.
研究领域:
材料科学
·
热传导工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Xianghui Feng,Chao Zeng,Fengxiang Sui,Jingya Liu,Kai Wu,Yonghong Cheng,Bing Xiao
Herein we demonstrate the synthesis of a new out-of-plane ordered double-transition-metal MAX phase known as Mo 2 VAlC 2 . Annealing the elemental powder mixture at 1540 °C with 2.0Mo: 1.0 V: 1.3Al: 1.8C results in a high yield of 91.2 wt% for Mo 2 VAlC 2 . The crystal structure of Mo 2 VAlC 2 is determined using Rietveld refinement of powder XRD, and which crystalizes into a hexagonal lattice structure with space group P6 3 /mmc. Employing the double spherical aberration corrected transmission electron microscopy, we confirm its chemically ordering behavior of one V layer sandwiched between two Mo layers. Additionally, its two-dimensional derivative Mo 2 VC 2 T x MXene has been successfully realized by etching the Al layer of Mo 2 VAlC 2 with hydrofluoric acid. The chemical composition and microstructure of Mo 2 VC 2 T x are inspected with SEM and EDX. The resulting multilayer and intercalated Mo 2 VC 2 T x exhibit the characteristic accordion-like and paper-like appearances, respectively. This work further expands the diversity of chemically ordered double-transition-metal MAX and MXene families.
研究领域:
材料科学
·
纳米技术
·
固体化学
✓ 已验证
DOI
高影响因子
Small
·
2023
·
IF 13.3
Ding Ding,Qian Wu,Qian Li,Yixun Chen,Chao Zhi,Xia Wei,Jinmei Wang
Wearable thermoelectric generators (TEGs) have exhibited great potential to convert the temperature gradient between the human body and the environment into electrical energy for maintenance-free wearable applications. A 2D planar device structure is widely employed for fabricating flexible TEGs due to its simple structure and facile fabrication properties. However, this device configuration is more appropriate for utilizing in-plane temperature differences than the out-of-plane direction, which limits their application in wearable cases since the temperature difference between the human body and the environment is in the out-of-plane direction. To solve this problem, a novel fabric-based TEG structure that can utilize the out-of-plane temperature gradient is proposed in this work. By introducing thermally conductive components in the generator, the out-of-plane temperature difference can be switched to the in-plane direction, which can be further utilized for 2D planar devices in wearable applications. The prepared thermoelectric fabric prototype with only 12 p-type TE legs exhibits a maximum open-circuit voltage of 4.69 mV and an output power of 39.7 nW at a temperature difference of 30 K. This strategy exhibits a high degree of versatility and can be readily applied to other 2D planar TEGs, thus expanding their potential application in wearable technology.
研究领域:
材料科学
·
电气工程
·
纳米技术
·
可穿戴设备
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Sixing Chen,Xinmiao Jin,Yuyang Wu,Taotao Ji,Fei Wang,Yi Liu
ABSTRACT Preferential orientation control of metal–organic framework (MOF) films is advantageous for maximizing pore uniformity and minimizing grain-boundary defects. Nonetheless, the preparation of MOF films with both in-plane and out-of-plane orientations remains a grand challenge. In this study, we reported the preparation of three-dimensionally oriented MIL-96 layers through combining morphology control of MIL-96 seeds with addition of polyvinylpyrrolidone surfactants and arachidonic acids. The three-dimensionally oriented MIL-96 film was readily obtained through in-plane epitaxial growth. It is anticipated that the aforementioned protocol can be effective for obtaining diverse MOF films with a three-dimensionally oriented organization.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NATURE MATERIALS
·
2025
·Vol. 24
·期 11
·1716-1725
·
IF 38.5
Zhang Zhi,Zhang Yuwei,Lu Kangjun,Zhang Jun-Jie,Zhang Nannan,Feng Rui,Ye Haoran,Zhou Xiaoli,Li Linglong,Wan Dongyang,Lu Junpeng,Ni Zhenhua,Wang Jinlan,Chen Qian,Lu Jiong,Li Zejun
Rolling two-dimensional materials into one-dimensional nanoscrolls introduces curvature, chirality and symmetry breaking, enabling emergent properties. Conventional methods relying on external driving forces, however, exhibit poor control, low yield and limited reproducibility. Here we report spontaneous scrolling in polar van der Waals materials via an electrochemical intercalation/exfoliation process, enabling scalable nanoscroll production. This self-rolling is driven intrinsically by out-of-plane electric polarization ( P ⊥ ), where the magnitude of P ⊥ is modulated by the intercalant size. Validated across eight polar materials, this approach achieves virtually 100% yield and reproducibility with defined scrolling direction, surpassing external driving force limitations. The nanoscrolls exhibit layer-independent inversion symmetry breaking and coherently enhanced second-harmonic generation, exceeding two-dimensional flakes by ~100-fold and rivalling leading two-dimensional nonlinear materials. Electrochemical initiation further facilitates metal-ion co-intercalation, yielding ten hybrid nanoscroll architectures. These findings establish a scalable route to create one-dimensional nanostructures and hybrid heterostructures, paving the way for designer quantum solids and van der Waals superlattices in quantum nanodevices.
研究领域:
材料科学
·
纳米技术
·
凝聚态物理
·
非线性光学
·
量子材料
✓ 已验证
DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Qiao Yu,Yuan Bai,Zhe Li,Fengying Jiang,Ruizeng Luo,Yansong Gai,Zhuo Liu,Lili Zhou,Yiqian Wang,Cong Li,Kailiang Ren,Dan Luo,Hongyu Meng,Zhou Li
Flexible biodegradable piezoelectric composite films prepared by combining water-soluble rigid piezoelectric crystals with flexible polymers have immense potential in the fields of wearable and implantable bioelectronics due to their self-powered, biocompatible, and biodegradable properties. However, comprehensive research on maintaining a high piezoelectric coefficient during fabrication of a flexible film is still lacking. In this work, based on γ-glycine, a simplest natural biodegradable piezoelectric crystal, we investigated the effects of different water-soluble biodegradable polymers and film-forming interfaces on the crystal type, arrangement, structure, and piezoelectric properties . The glycine-PEO composite film prepared using the co-dissolution-evaporation method on the more hydrophobic PTFE interface exhibits a higher out-of-plane piezoelectric coefficient (d 33 ) of ∼8.2 pC/N, which is very close to the theoretical d 33 (10.4 pC/N) of the γ-glycine crystal. This study establishes that interface-induced effects have significant impacts on the crystal arrangement and piezoelectricity of composite films. This study provides important guidance for future research on flexible preparation of other flexible piezoelectric materials .
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
压电学
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）