ACS Applied Materials & Interfaces
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2017
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IF 7.504
Tian Xia,Wenhao Luo,Fan Hu,Wu Qiu,Zhisen Zhang,Youhui Lin,Xiang Yang Liu
On the basis of their superior optical performance, photonic crystals (PCs) have been investigated as excellent candidates for widespread applications including sensors, displays, separation processes, and catalysis. However, fabrication of structurally controllable large-area PC assemblies with no defects is still a tough task. Herein, we develop an effective strategy for preparing centimeter-scale crack-free photonic crystal films by the combined effects of soft assembly and superhydrophobic nanopin surfaces. Owing to its large contact angle and low-adhesive force on the superhydrophobic substrate, the colloidal suspension exhibits a continuous retraction of the three-phase (gas–liquid–solid) contact line (TCL) in the process of solvent (water molecules) evaporation. The constantly receding TCL can bring the colloidal spheres closer to each other, which could timely close the gaps due to the loss of water molecules. As a result, close-packed and well-ordered assembly structures can be easily obtained. We expect that this work may pave the way to utilize novel superhydrophobic materials for designing and developing high-quality PCs and to apply PCs in different fields.
研究领域:
材料科学
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光学工程
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表面科学
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
·Vol. 108
·期 6
·e20401
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IF 3.8
Yu Ma,Zhenting Zhu,Huangshuai Zhang,Mohamed Kallel,Zihao Yang,Juanna Ren,Salah M. El-Bahy,Zhe Chen,Zeinhom M. El-Bahy,Hang Zhang,Zhanhu Guo
Freeze-drying is a promising method for drying gels, but it is considered incapable of preparing bulk inorganic oxide aerogels. Herein, using tert-butanol/water co-solvent as the freeze-drying solvent, large-size crack-free monolithic silica aerogels with different absolute ethyl alcohol to tetraethylorthosilicate molar ratios were successfully synthesized via a vacuum freeze-drying process. Superhydrophobicity was then obtained through an efficient chemical vapor deposition hydrophobic modification process. As the molar ratio increased from 8 to 16, the density, linear shrinkage, specific surface area (SSA), and mechanical properties decreased, while the thermal conductivity decreased first and then increased. The freeze-dried silica aerogels show the lowest density of 0.078 g/cm 3 , the lowest linear shrinkage of 4.6%, the highest SSA of 962 m 2 /g, the highest Young's modulus of 904.3 kPa, and a lowest thermal conductivity of 0.026 W/(m·K). Despite the formed fine ice crystals compressing the gel skeleton to some extent in the freeze-drying process, the developed mesoporous skeleton structure is basically preserved, which ensures excellent thermal insulation and mechanical performance. This study demonstrates that high-quality monolithic inorganic oxide aerogels can be effectively prepared by the freeze-drying method, which provides them with another efficient drying method independent of supercritical fluid drying and ambient pressure drying methods.
研究领域:
材料科学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Haojie Xing,Bin He,Stephan Handschuh-Wang,Xinqing Gao,Junrong Zeng,Zongyan Zhang,Qiyuan Chen,Jiangtao Huang,Peigang Han
The integration of diamond films onto copper substrates offers significant potential for thermal management in high-power electronics, leveraging diamond's exceptional thermal conductivity and electrical insulation. However, substantial challenges arise from the significant thermal expansion coefficient (CTE) mismatch, leading to substrate warping and film cracking. This study establishes a critical substrate thickness effect through systematic experiments: Single-side nanocrystalline diamond (NCD) deposited on thin copper substrates (0.5 mm) exhibits severe warping (curvature radius: 55.53 mm) but maintains film integrity, whereas identical deposition on thick copper (1.5 mm) reduces warping (radius: 219.4 mm) yet induces extensive cracking due to amplified compressive stress. To overcome this trade-off, we develop a dual-side heterogeneous deposition strategy: NCD grown at low temperature (700 °C) on one side provides strain accommodation, while subsequent microcrystalline diamond (MCD) deposition on the opposite side achieves stress cancellation. This approach simultaneously resolves both failure modes---increasing the warpage radius to 395.03 mm (an increase of 711 % compared to single-side deposition) while ensuring crack-free integrity in both 5 μm thick deposited films. The underlying mechanisms involve: (1) Gradual stress decay through a gradient interfacial architecture (amorphous carbon layer - nanocrystalline buffer - microcrystalline main layer); (2) Enhanced adhesion via mechanical interlocking induced by substrate pretreatment; (3) Plastic deformation at the interface absorbing residual strain. Thermal testing confirms hot-end temperature reductions of 7.7 °C and 42.2 °C compared to AlN and Al₂O₃, respectively, at 6 W power, validating superior heat dissipation. This work provides an electrically insulating diamond‑copper composite with high thermal conductivity for next-generation thermal management solutions.
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DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 29
·2300621
·
IF 29.4
Zhaoning Hu,Fangfang Li,Haotian Wu,Junhao Liao,Quan Wang,Ge Chen,Zhuofeng Shi,Yaqi Zhu,Saiyu Bu,Yixuan Zhao,Mingpeng Shang,Qi Lu,Kaicheng Jia,Qin Xie,Guorui Wang,Xiaodong Zhang,Yinbo Zhu,Hengan Wu,Hailin Peng,Li Lin,Zhongfan Liu
Recently, scalable production of large-area graphene films on metal foils with promising qualities is successfully achieved by eliminating grain boundaries, wrinkles, and adlayers. The transfer of graphene from growth metal substrates onto functional substrates remains one inescapable obstacle on the road to the real commercial applications of chemical vaport deposition (CVD) graphene films. Current transfer methods still require time-consuming chemical reactions, which hinders its mass production, and produces cracks and contamination that strongly impede performance reproducibility. Therefore, graphene transfer techniques with fine intactness and cleanness of transferred graphene, and improved production efficiency would be ideal for the mass production of graphene films on destination substrates. Herein, through the engineering of interfacial forces enabled by sophisticated design of transfer medium, the crack-free and clean transfer of 4-inch-sized graphene wafers onto silicon wafers within only 15 min is realized. The reported transfer method is an important leap over the long-lasting obstacle of the batch-scale graphene transfer without degrading the quality of graphene, bringing the graphene products close to the real applications.
研究领域:
材料科学
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纳米技术
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Bananakere Nanjegowda Chandrashekar,Nianduo Cai,Louis W.Y. Liu,Ankanahalli Shankaregowda Smitha,Zefei Wu,Pengcheng Chen,Run Shi,Weijun Wang,Jingwei Wang,Chunmei Tang,Chun Cheng
Hypothesis Transfer of chemical-vapor-deposition (CVD) grown monolayer graphene from one substrate to another requires a transfer agent. The transfer agent usually needs to be removed by washing with organic solvent such as acetone or high temperature annealing, which is harmful to the structure integrity and intrinsic property of a graphene film. Here, we propose the use of camphor as a transfer agent to transfer monolayer graphene onto a target dielectric substrate, which bypasses these demanding steps and only needs the common alcohol solvent rinsing. Experiments To facilitate a crack-free graphene transfer, the proposed approach allows the camphor supported polycrystalline graphene to be rationally fastened with a thickened and solidified edge bead (i.e. camphor oil-filled boundary). A layer of camphor was first deposited onto a graphene/copper surface. The backside copper substrate was then etched away, whilst the camphor/graphene bilayer was placed onto a SiO 2 /Si substrate. Finally, the camphor remaining on the camphor/graphene/SiO 2 /Si sublimed into a vapor. The graphene/SiO 2 stack was then examined by microscopic, spectral and electrical characterization. Findings The results of our examination suggest that the proposed method can guarantee a clean and damage-free graphene transfer. This method is particularly attractive in the application area for nano/micro-electronics, where it provides CVD-grown graphene the ability to be used on wide varieties of substrates that are sensitive to organic solvents and high temperature.
研究领域:
材料科学
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纳米技术
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电子学
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DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Peng Dai,Wenyun Su,Zhaokun Xian,Xiangfu Wei,Shengchang Tang,Guangyong Huang,Cuimin Sun,Wei Han,Ling Zhu,Hui You
Developing a rapid fabrication method for crack-free opal films is a significant challenge with broad applications. We developed a microfluidic platform known as the “filter paper-enhanced evaporation microfluidic chip” (FPEE-chip) for the fabrication of photonic crystal and inverse opal hydrogel (IOPH) films. The chip featured a thin channel formed by bonding double-sided adhesive poly(ethylene terephthalate) with a polymethyl methacrylate cover and a glass substrate. This channel was then filled with nanosphere colloids. The water was guided to evaporate rapidly at the surface of the filter paper, allowing the nanospheres to self-assemble and accumulate within the channel under capillary forces. Experimental results confirmed that the self-assembly method based on the FPEE-chip was a rapid platform for producing high-quality opal, with centimeter-sized opal films achievable in less than an hour. Furthermore, the filter paper altered the stress release mechanism of the opal films during drying, resulting in fewer cracks. This platform was proven capable of producing large-grain, crack-free opal films of up to 30 mm2 in size. We also fabricated crack-free IOPH pH sensors that exhibited color and size responsiveness to pH changes. The coefficient of variation of the gray color distribution for crack-free IOPH ranged from 0.03 to 0.07, which was lower than that of cracked IOPH (ranging from 0.07 to 0.14). Additionally, the grayscale peak value in 1 mm2 of the crack-free IOPH was more than twice that of the cracked IOPH at the same pH. The FPEE-chip demonstrated potential as a candidate for developing vision sensors.
研究领域:
材料科学
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纳米技术
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传感器
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微流控
·
光子学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jing Men,Junzong Feng,Yonggang Jiang,Liangjun Li,Yijie Hu,Jian Feng
As a promising high-temperature thermal insulation, carbon aerogel is generally prepared by the carbonization of an organic aerogel. However, the preparation processes of solvent exchange and supercritical drying are complicated and contaminated, which hinder their large-scale production and application in the field of civil high-temperature thermal insulators. Herein, the nanoporous carbon aerogels were prepared by an environmentally friendly method of ambient pressure drying without solvent exchange with the usage of water as the solvent, acetic acid as an acid catalyst, and biopolymer chitosan as a cross-linking agent and supporting template. Through the polymerization and hydrogen bonds of chitosan with precursors to strengthen the gel network, carbon aerogels exhibit good monolithic shape (130 × 130 × 18 mm) with nanoparticle size (43–107 nm) and low density (0.187–0.395 g/cm3), leading to a low thermal conductivity (0.09592 W/m·K) and high compressive strength (11.50 MPa) at the density of 0.395 g/cm3. Notably, by the copyrolysis of organic fiber-reinforced organic aerogel composite, a crack-free carbon aerogel composite (0.244 g/cm3) was prepared with enhanced mechanical properties (compressive strength of 1.63 MPa at 10% strain and bending strength of 4.27 MPa) and low thermal conductivity (0.107 W/m·K at 1100 °C). This work may provide an environmentally friendly method for the industrialized preparation of reliable nanoporous carbon aerogels for high-temperature thermal protection components.
研究领域:
材料科学
·
化学工程
·
环境科学
·
热能工程
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产品关联
DOI
高影响因子
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