NANOTECHNOLOGY
·
2017
·Vol. 28
·期 47
·475602
·
IF 3.44
Jiheng Ding,Hongran Zhao,Qiaolei Wang,Wanjun Peng,Haibin Yu
Due to their high thermal conductivity and insulation performance, boron nitride nanosheets (BNNS) have great promise to fabricate thermal management equipment for application in power electronics. The liquid-phase exfoliation route has been regarded as the most commonly used approach to produce single and few-layered BNNS for many research fields. However, this process takes a long time, and the production yield is extremely low. In this work, an efficient technique to obtain few-layered (mostly < 5 layers), high-yield (∼33%), and plane-defect-free BNNS by the combination of liquid N2 (L-N2) gasification and liquid exfoliation was developed. The as-obtained BNNS suspensions could be vacuum filtered to make a thermal conductive film named a BNNS heat spreader which possessed a superior thermal conductivity of 61.2 W m−1 K−1 at room temperature. In addition, we also proved that the thermal conductivity of the BNNS heat spreader increased with the increase of density, creating an approach for fine tuning the thermal property of this heat spreader.
研究领域:
材料科学
·
热物理学
✓ 已验证
DOI
高影响因子
Nano Research
·
2022
·Vol. 16
·期 4
·5033-5041
·
IF 10.269
Wang Zhi-Guo,Shen Hui-Yuan,Yu Ruo-Lin,Gao Jie-Feng,Zhang Guo-Qiang,Xu Chun,Lei Jun,Du Ji-Guang,Xu Jia-Zhuang,Li Zhong-Ming
Two-dimensional (2D) nanomaterials have aroused immense attention in extensive applications due to their intriguing physical and chemical properties. However, there is a formidable challenge to prepare few-layered and functionalized 2D nanomaterials in an effective and universal way. Herein, we developed an integrated strategy of glucose-assisted mechanochemical exfoliation and cosolvent-intensified sonication exfoliation to effectively exfoliate and functionalize 2D materials. Taking exfoliation of boron nitride (BN) as an example, the production yield and functionalization ratio of BN nanosheets (BNNSs) reached 47.5% and 25.8 wt.%, 188% and 16% higher than that of BNNSs without sonication exfoliation, respectively. The introduction of glucose not only augmented the friction force between adjacent BN layers to promote the efficiency of ball-milling-driven exfoliation supported by density functional theory calculation, but also reacted with active edges of BNNSs for functionalization. Afterwards, cosolvent-intensified sonication exfoliation strongly stabilized exfoliated BNNSs, obviously boosting the exfoliation yield. This proposed method is universal for preparing various 2D nanomaterials like molybdenum disulfide, tungsten disulfide, and graphene nanosheets. The thin plate structure and high functionalization ratio enabled the release of property superiorities of 2D nanomaterials. Our work offers a promising prototype to realize mass production of functionalized 2D nanomaterials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2021
·Vol. 18
·期 2
·272-281
·
IF 3.679
Xiaodong Wan,Yunfeng He,Canhui Yang
In this work, the peel of hydrogels under a stiff backing constraint was studied using a finite element method. The finite element method was first validated by comparing the simulation results to theoretical predictions and experimental measurements. Then, the method was used to investigate the effects of adhesion thickness, adhesion length and backing thickness on the peel behaviors, as well as the stress distribution within the adhesion layer. The results indicated that the peel force–displacement curve has a constant profile when the adhesion thickness and backing thickness are prescribed so long as the adhesion length is sufficiently long. The peak peel force increases with the adhesion length and then plateaus. The larger the intrinsic peak stress or the thicker the backing, the higher the plateau. The steady-state peel force is independent of the backing thickness, while positively correlated with the strain energy storage of the hydrogel adhesion layer. The critical vertical displacement corresponding to the peak peel force increases with the hydrogel thickness and decreases with the backing thickness. However, the critical vertical displacement corresponding to the steady-state peel force increases with the backing thickness. The present work puts forward an effective numerical approach to probe the peel of hydrogels, which is beneficial for the design of relevant structures.
研究领域:
生物材料
·
生物力学
·
组织工程
·
医用高分子材料
·
界面力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9543-9549
·
IF 2.22
Liu Wanying,Zhu Yabo,Xu Xiang,Wang Shasha,Zhang Xinxi
The wet ball milling (WBM) method is, for the first time, used for the exfoliation of bulk black phosphorus (BP) to obtain few-layer black phosphorus (FBP). Before that, the rational solid–liquid ratio of raw material is determined to be 1:1 (mg/mL) for the popular ultrasound liquid exfoliation (ULE). Obviously, the high proportion of organic solvent used in ULE will lead to serious environmental pollution. Compared with ULE, the solid/liquid ratio for WBM exfoliation is 100:1 (mg/mL) showing its advantage of less demand for organic solvent. In addition, different types of organic solvents are used to determine the proper organic solvent for WBM exfoliation. Ultraviolet–visible–near-infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and laser particle size analyzer are used to comprehensively characterize the layer numbers, morphology size, and phase structure of FBP yielded by WBM exfoliation. The results show that dimethyl sulfoxide (DMSO) is the suitable organic solvent for BP exfoliation; FBP flakes with 3–5 layers and micron size are obtained by WBM exfoliation.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Guangmao Yin,Junqing Han,Yuxi Zhu,Xinxin Song,Kexing Song,Yuying Wu
Extremely thin copper foils are critical for high-speed and high-frequency electronic devices, as they significantly reduce signal transmission losses and minimize heating effects. These foils are typically fabricated by depositing onto a carrier foil coated with a stripper layer, where the design of the stripper layer is pivotal. Although benzotriazole coating is a technically mature organic stripping layer, its potential carcinogenicity and environmental persistence may pose long-term risks to human health and the ecological environment, instead of this, a novel composite stripper layer was developed in this work, which comprises a nickel metallic interlayer and an adenine-based organic layer for extremely thin copper foil fabrication. The peel strength of the resulting copper foils (thicknesses: 3.2 μm, 6.5 μm, and 9.7 μm) was evaluated under a constant current density of 20 A/dm 2 , yielding values of 0.012 N/mm, 0.010 N/mm, and 0.009 N/mm, respectively. Variations in current density (8.1 A/dm 2 , 15 A/dm 2 , and 20 A/dm 2 ) further revealed peel strengths of 0.004 N/mm, 0.010 N/mm, and 0.012 N/mm, indicating that the peeling process is relatively easy. Combined theoretical and experimental analyses elucidated the formation mechanism of the composite stripper layer, demonstrating that the adenine-based organic layer adsorbs onto the nickel surface via N–Ni bonding. This mechanism further offers insights into the design of composite peel-off layers, enabling the preparation of extremely thin copper foils. Such a process holds significant potential for the extensible fabrication of conductive patterns in radio frequency identification (RFID) circuits, flexible printed circuits (FPCs), and other advanced electronics applications.
研究领域:
材料科学
·
电子材料
·
表面工程
·
电化学
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7178
·
IF 4.927
Yan Chen,Ao Li,Xiuli Fu,Zhijian Peng
The difficulty of exposing active sites and easy recombination of photogenerated carriers have always been two critical problems restricting the photocatalytic activity of g-C3N4. Herein, a simple (NH4)2MoO4-induced one-step calcination method was successfully introduced to transform bulk g-C3N4into g-C3N4/MoO2composites with a large specific surface area. During the calcination, with the assistance of NH3and water vapor produced by ammonium molybdate, the pyrolytical oxidation and depolymerization of a g-C3N4interlayer were accelerated, finally realizing the exfoliation of the g-C3N4. Furthermore, another pyrolytical product of ammonium molybdate was transformed into MoO2under an NH3atmosphere, which was in situ loaded on the surface of a g-C3N4nanosheet. Additionally, the results of photocatalytic hydrogen evolution under visible light show that the optimal g-C3N4/MoO2composite has a high specific surface area and much improved performance, which is 4.1 times that of pure bulk g-C3N4. Such performance improvement can be attributed to the full exposure of active sites and the formation of abundant heterojunctions. However, with an increasing feed amount of ammonium molybdate, the oxidation degree of g-C3N4was enhanced, which would widen the band gap of g-C3N4, leading to a weaker response ability to visible light. The present strategy will provide a new idea for the simple realization of exfoliation and constructing a heterojunction for g-C3N4simultaneously.Keywords:g-C3N4;MoO2;exfoliation;photocatalytic hydrogen evolution
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Ziyuan Zhou,Lei Li,Xiaoya Liu,Haoyong Lei,Wanjie Wang,Yanyu Yang,Jianfeng Wang,Yanxia Cao
Two-dimensional (2D) transition metal carbides and nitrides (MXenes) have spurred great attention in many applications due to their outstanding electronic or mechanical properties. The exfoliation into single and fewer layer nanosheets of MXene is a requisite step for performance study in many cases. Herein this study aims to propose a facile and convenient liquid phase exfoliation (LPE) method to fabricate fewer-layer MXene nanosheets in large scale. The Hansen solubility parameters (HSPs) and surface tension component ratio are estimated and further applied to detect a green low-boiling-point water/acetone cosolvent for the better exfoliation of MXene. It has been found that the exfoliation efficiency is improved efficiently by matching HSPs and surface tension component ratio of MXene to that of solvents. A high concentrated MXene dispersion up to 1.727 mg/ml in the optimum composition of the water/acetone mixture which is approximately 78 and 5 times higher than that in pure acetone and water, respectively. Detailed characterization of morphology and suspension stability of exfoliated MXene are implemented which exhibit that the high quality and more stable MXene nanosheets are obtained in the suitable cosolvent. In addition, the determined HSPs and surface tension component ratio of MXene here will make a contribution to finding other new efficient solvents for MXene conveniently in specific fields.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Yaodong Li,Shirui Weng,Rui Niu,Weili Zhen,Feng Xu,Wenka Zhu,Changjin Zhang
We report a highly efficient and easily transferable poly(vinyl alcohol) (PVA)-assisted exfoliation method, which allows one to obtain van der Waals materials on large scales, e.g., centimeter-scale graphite flakes and hundred-micrometer-scale several layers of ZnIn2S4 and BN. The present exfoliation scheme is nondestructive, and the materials prepared by PVA-assisted exfoliation can be directly fabricated into devices. This exfoliation approach could be helpful in overcoming the preparation bottleneck for large-scale applications of two-dimensional (2D) materials.
研究领域:
材料科学
·
纳米科技
·
表面科学
·
凝聚态物理
·
化学合成
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 7
·2200884
·
IF 4.6
Xiaohua Cui,Jiaming Liu,Ending Zhang,Ziyang Gong,Liyan Liang,Jun Shi,Xiaopeng Hao,Jiwen Hu,Mangeng Lu
Thermally conductive pressure-sensitive adhesive (PSA) has received a great amount of attention in recent years, but the traditional PSA hardly loses adhesion properties after UV irradiation or heating. Therefore, endowing thermally conductive adhesive with UV-responsive peelability becomes a design strategy. Herein, vinyl-functionalized graphene (AA-GMA-G) is prepared by modifying graphene with acrylic acid and subsequently reacting with glycidyl methacrylate. Then, the UV-curable acrylate copolymer is synthesized by grafting glycidyl methacrylate. Finally, the novel thermally conductivity PSA with UV-responsive peelability is obtained by blending the copolymer with AA-GMA-G and photoinitiator. The results show that the PSA at 2 wt% AA-GMA-G loading exhibits an excellent thermal conductivity (0.74 W m −1 K −1 ) and a relatively strong peel strength, increasing by 15% compared with pristine graphene/PSA. Interestingly, the peel strength of AA-GMA-G/PSA can achieve a dramatic drop after UV treatment, and the decrease rate is 96.7%. Therefore, the novel thermally conductive PSA with UV-responsive peelability has potential applications in certain electronic devices.
研究领域:
材料科学
·
化学工程
·
粘合技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Guoqing Zhang,Danmin Liu,Nan Tian,Xiuhong Wang,Wujuan Yan,Zikun Huang,Yongzhe Zhang
One-dimensional materials have been intensively studied because of their diverse properties, which are revealed when exfoliated from their bulk precursor. Liquid exfoliation is not only possibly the most suitable method for large-scale applications but also affords an opportunity to develop new deposition techniques. Fibrous phosphorus is a relatively new, one-dimensional material with high carrier mobility and a fast response velocity for future application in nanodevices. Because controllable liquid exfoliation processing of fibrous phosphorus (FP) remains challenging, we considered two factors: the exfoliated result and the removable solvents. We proposed a method for determining suitable solvents for efficient exfoliation and controllable size of fibrous phosphorus using Hansen solubility parameters. By controlling the water/acetone mixture ratios, the exfoliation effect could be controlled. Our work showed that 40% of the FP nanofibers were less than 10 nm in thickness and 70% of them were less than 20 nm. Furthermore, fibrous phosphorus produced a red fluorescence in bioimaging.
研究领域:
材料科学
·
细胞生物学
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 5
·1008
·
IF 4.967
Huiyuan Zhang,Hongxing Zhang,Wenchao Zhu,Hailing Xi,Bomou Ma,Yong He
Strippable film is effective for removing radioactive contamination. However, it still has some limitations, such as the long curing time (about 30 min~24 h) and the requirement of organic solvents. To address these issues, we report a simple protocol to prepare strippable decontamination films using liquid polybutadiene (LPB) and tert-butyl acrylate (TBA) as the raw materials without solvent and using camphorquinone/ethyl 4-dimethylaminobenzoate (CQ/EDB) as a photoinitiator, where the film was formed under household LED panel light or daylight irradiation for about 540 s. After a thorough study of viscosity, real-time Fourier transform infrared (RT-FTIR spectra), gel and volatile organic compound (VOC) contents, mechanical properties and decontamination efficiency, the optimum composition and curing conditions were determined for the decontamination strippable film. VOC content is as low as 12.7 ± 0.7% and the resultant strippable film exhibits good mechanical performances with a tensile strength of up to 5.4 ± 0.4 MPa and elongation of up to 66.6 ± 13%. Most important, the decontamination efficiencies of this strippable film for133CsCl on glass, ceramic and metal surfaces reach up to 98.1%, 94.3% and 97.6%, respectively.Keywords:visible light curing;strippable film;radioactive decontamination
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2014
·Vol. 21
·期 4
·2469-2478
·
IF 3.033
Sun Peipei,Kuga Shigenori,Wu Min,Huang Yong
Dry ball milling of graphite with cellulose and related polysaccharides was found effective for exfoliation-dispersion of graphene-like carbon. The exfoliation behavior was found to depend strongly on the polymer species; namely, polysaccharides are much more effective than thermoplastic polymers. The compression-molded slabs from co-milled powder with cellulose and carboxymethylcellulose showed an electrical percolation threshold of 1.0 % (w/w) or lower. The carbon fraction isolated from milling with carboxymethylcellulose was water-dispersible, containing single- to few-layer graphenes. This method can provide facile and solventless graphene exfoliation and mechanical alloying with polymers.
研究领域:
材料科学
·
化学工程
✓ 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）