COMPOSITES SCIENCE AND TECHNOLOGY
·
2015
·
IF 3.569
Biao Zhang,Feng Ye,Ye Gao,Qiang Liu,ShiChao Liu,Limeng Liu
Bisphenol-A cyanate ester resin (BADCy)/Ni 0.5 Ti 0.5 NbO 4 composites with novel structure, within which Ni 0.5 Ti 0.5 NbO 4 and BADCy are continuous directional distribution and parallel to the electric field direction (marked as composite-directional), were designed and fabricated using freeze casting combined with vacuum assisted infiltration process. Dielectric properties as well as the moisture absorption of the composites were studied. Theoretical models used to predict the dielectric properties of the composites were established. Results show that the novel structure can significantly improve the dielectric constant while decrease dielectric loss compare with traditional structure in which Ni 0.5 Ti 0.5 NbO 4 filler is homogeneously distributed (the composite marked as composite-homogeneous). Dielectric constant of composite-directional is as high as 19.93 while dielectric loss is only 4.07 × 10 −3 (at 7319 MHz) when Ni 0.5 Ti 0.5 NbO 4 content is 43.79 vol%. Furthermore, the dielectric constant of both composite-directional and composite-homogeneous can be predicted using Rother-Lichtenecker model when the fitting parameters ( n ) are −0.5188 and −0.1499, respectively. Distribution state of Ni 0.5 Ti 0.5 NbO 4 is the main reason for the difference of fitting parameters. Due to the excellent properties of composite-directional, this kind of composites can be used as printed circuit board (PCB) materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Huanqin Zhao,Xin Yang,Jiachen Sun,Hualiang Lv,Xiaohuan Liu,Xuke He,Changqin Jin,Renchao Che
Three-dimensional (3D) carbon aerogel with high porosity and lightweight merit has emerged as an important high-performance electromagnetic (EM) absorption material. Despite great progress has been made, most reported 3D carbon aerogels suffer from non-renewability and high cost. Moreover, the randomly distributed porous structure restricts the effective regulation of microwave absorption. Herein, the sustainable shaddock peel cellulose (SPC) was adopted to construct an ultralight and orientated carbon aerogel through a facile bidirectional freezing technique and subsequently thermal treatment process. The resultant carbon aerogel is composed of ordered lamellar layers interconnected by supported bridges, forming a continuous 3D conductive network. Addition of a small amount of graphene oxides (GO) nanosheets in biomass aerogel enhances the interaction of SPC and promotes electron transmission along 3D conductive network. Through tuning the lamellar spacing of aerogel, the as-prepared carbon aerogel achieves a remarkable microwave absorption property with a strong reflection loss (RL) of -63.0 dB and broad effective absorption bandwidth (EAB) of 7.0 GHz under ultralow filler content of 4 wt.%. Moreover, this carbon aerogel also demonstrates excellent thermal insulation property, and is even comparable to commercial products. The present work paves the way for designing low-cost and sustainable biomass-derived carbon aerogel for lightweight and high-performance microwave absorption and infrared stealth function.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2025
·
IF 5.6
Jinzhi Liu,Zhiyuan Lin,Huanyou Wu,Jianming Zhang,Fujun Wang,Lu Wang,Shuliang Lu,Jing Gao
Skin peripheral nerve injury repair still faces significant clinical challenges. Although nerve tissue engineering scaffolds show potential, issues such as limited functionality and low repair efficiency persist. This study developed a dual-regulation biomimetic composite nerve scaffold with oriented structure and conductive function to promote nerve injury repair. The structural layer was a chitosan (CS)/polycaprolactone (PCL) oriented nanofiber membrane, which could promote cell adhesion and induce directional growth of cells. The functional layer was a CS/sodium alginate (SA) ionic conductive hydrogel, which could enhance endogenous electric fields to promote cell proliferation and differentiation. The two layers were combined through physical crosslinking, avoiding the use of chemical adhesives and preserving the surface morphology of the nanofibrous membrane and the porous structure of the hydrogel. The biomimetic composite nerve scaffold exhibited layered degradability, excellent orientation, conductivity, and biocompatibility. Cell experiments indicated that the scaffold effectively induced directional migration, growth, and differentiation of cells and enhanced cell activity, thereby providing a favorable microenvironment for nerve regeneration. This study not only overcomes the limitation of functional singularity in traditional nerve scaffolds but also aligns with the forefront trend in tissue engineering toward multifunctional and biomimetic materials. It demonstrates great potential for treating complex conditions such as traumatic nerve defects and post-surgical nerve regeneration and has broad application prospects in the field of neural tissue engineering.
研究领域:
组织工程学
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神经科学
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生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Zuomin Lei,Keyu Zhu,Fanglin Lv,Mengliang Hu,Xuebin Liu,Jianhong Wei,Shu-Shen Lyu,Dong-chuan Mo,Yougen Hu
High-performance electromagnetic interference (EMI) shielding materials with outstanding thermal transfer ability are urgently needed for modern electronics. Here, efficient 3D-oriented graphite/silicone EMI shielding composite slices with high through-plane thermal conductivity were prepared through the construction of 3D-oriented graphite skeletons followed by incorporation of silicone and cutting. The flaky graphite was utilized as functional fillers , and an ultra-low addition of aramid nanofibers (ANFs) was conducted to construct the supporting frameworks to maintain the structure of 3D-oriented graphite skeletons. The strategy of constructing of 3D-oriented graphite skeletons before incorporating of silicone facilitated the forming of efficient electrically conductive network and thermal transfer pathway in the prepared composite slices. The differences in thermal, electrical and EMI shielding properties that originated from the orientation of interconnected flaky graphite were systematically studied. As a result, the composite slices show significant enhancements of EMI SE of 65.28 dB in X-band, 76.62 dB in Ka-band and through-plane thermal conductivity of 10.53 W m −1 K −1 at the graphite fraction of 32.68 vol%. Additionally, the composite slices exhibit a good near-field (NF) shielding performance at the frequency range of 1–9 GHz. The composite slices reveal substantial potential for advanced EMI shielding and thermal management applications.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 38
·27555-27564
·
IF 3.9
Zezhou Yang,Zhiyu Zhao,Dongsheng Yang,Liangyu Zhu,Zirou Qiu,Yifan Wu,Cheng Lan,Wenchuan Jiang,Geng Li,Bin Zhong,Jin Wei,Tao Liu,Heping Xie
Owing to their nontoxicity, environmental friendliness, and high biocompatibility, physically cross-linked hydrogels have become popular research materials; however, their high water content and high free volume, along with the weak bonding interactions inherent to ordinary physically cross-linked hydrogels, limit their application in fields such as flexible devices, packaging materials, and substance transport regulation. Here, a structural barrier approach based on directional freezing-assisted salting out was proposed, and the directional structure significantly enhanced the barrier performance of the hydrogel. When the direction of substance diffusion was perpendicular to the pore channel structure of the directional freezing-PVA hydrogel (DFPVA), the Cl− transmission rate was 57.2% for the uniform freezing-PVA hydrogel (UFPVA). By adjusting the concentration of the salting-out solution and the salting-out time, the crystallinity and crystal domain size of the hydrogel could be further changed, optimizing and regulating the barrier performance of the hydrogel, with the best Cl− unit permeability being 36.02 mg mm per cm2 per day. Additionally, DFPVA had excellent mechanical properties (stress of 6.47 ± 1.04 MPa, strain of 625.85 ± 61.58%, toughness of 25.77 ± 3.72 MPa). Due to the barrier and mechanical properties of the direct structure, DFPVA is suitable as a drug carrier for slow drug release in vitro.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Hang Han,Xiao Liu,Jiahuan Zhang,Lingna Su,Zhiqiang Li
We here report a Yb-containing Near-Infrared hybrid elastomer with anisotropic mechanical behavior as well as anisotropic luminescent performance, which is constructed by aligning the superparamagnetic nanoparticle coated alumina (Fe/Al 2 O 3 ) platelets with a magnetic field, then the oriented structure is fixed by in situ evaporation. Because the mechanical reinforcement of aligned Fe/Al 2 O 3 platelets to the polymeric elastomer is anisotropic, the mechanical strength parallel to the magnetic field is much higher than that of perpendicular to the magnetic field. Meanwhile, the hybrid elastomer also shows anisotropic NIR luminescence behavior, since the “shading effect” of the aligned Fe/Al 2 O 3 platelets on the Yb 3+ emitting centers is orientation-dependent. The method we report here may have great potentials in anisotropic sensing and physiological signal transduction , etc., which are essential for electronic skin and smart actuator.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Jianying Deng,Yuanyuan Zhou,Jiushuai Deng,Biao Zhao
Nickel-based metal composites are highly promising candidates in the field of electromagnetic interference (EMI) shielding. However, the preparation of nickel-based EMI shielding materials that combine low reflection and high absorption characteristics still faces significant challenges. This study reports a rapid one-step method for preparing magnetic nickel-cobalt (NiCo) array foam with an oriented arrangement strategy, which involves the magnetic field-induced chemical deposition of nickel-cobalt nanoparticles to form a directional structure. Thanks to this oriented structure, the prepared NiCo array foam exhibits ultra-high electromagnetic shielding effectiveness (>70 dB) over an ultra-wideband (18-26.5 GHz) range. Additionally, this magnetic field-induced orientation strategy is equally applicable to other unitary or binary systems, which also demonstrate excellent electromagnetic shielding performance. This research provides new ideas and methods for the structural design of nickel-based metal materials in the field of EMI shielding.
研究领域:
材料科学
·
电磁干扰屏蔽
·
纳米技术
·
金属复合材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Fujun Han,Tianyu Wang,Ying Chen,Xiuyan Ren,Zhihao Peng,Xulong Zheng,Kairui Wang,Yiyan Gao,Ya Cheng,Guanghui Gao
As a self-powered device, triboelectric fiber-generators (TEFGs) have garnered considerable attention over the past decade, overcoming the limitations of conventional power sources. Significantly, while both structures function, the aligned nanofiber film demonstrably outperforms the random nanofiber film in triboelectric output performance. Hence, a triboelectric all-nanofiber generator with an aligned structure is investigated, consisting of the co-electrospun polyacrylonitrile (PAN)/thermoplastic polyurethane (TPU) nanofiber positive triboelectric layer and polyvinylidene fluoride (PVDF)/polydimethylsiloxane (PDMS) nanofiber negative triboelectric layer. After the optimization of structure, triboelectric fiber-generators with aligned (A-TEFG) exhibited peak-to-peak voltage, current output, and transient power density values of 55 V, 0.8 μA, and 33.6 mW/m 2 , respectively, which could efficiently harvest mechanical energy to power light-emitting diodes (LEDs). Furthermore, A-TEFG was used as self-powered sensors for human movement monitoring and transmitting encrypted information followed Morse code principles. Based on the simple and scalable fabrication methods, A-TEFG makes a promising candidate to developing practical, flexible, and self-powered wearable electronic devices.
研究领域:
纳米技术
·
能量收集
·
柔性电子学
·
可穿戴设备
·
传感器技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SOFT MATERIALS
·
2022
·
IF 1.619
Kai Chen,Tian Zong,Qin Chen,Siyu Liu,Linmin Xu,Dekun Zhang
In order to control complex motion behavior in organisms, most biological tissues have highly oriented structures and anisotropic mechanical properties, such as articular cartilage, muscle, skin and blood vessel. In this study, inspired by the directional structure and excellent mechanical properties of biological soft tissues, polyvinyl alcohol/carboxymethyl cellulose hydrogels with different contents of sodium alginate were prepared by combining freeze-thaw and prestretching methods. Compared with SEM images without pre-stretch hydrogels, there are obvious ordered pore structures in the pre-stretch samples along the tensile direction, and the network structure becomes denser. XRD and FTI R results indicate that the introduction of SA and CMC increases the number of internal hydrogen bond and forms new covalent bonds. The tensile strength of the hydrogel without annealing and stretching treatments is only 0.41MPa. After annealing and stretching treatments, the tensile strength of the hydrogel is increased to 0.93MPa. Furthermore, the creep deformation of hydrogel was reduced from 1.08 mm to 0.27 mm by annealing and stretching treatments. To sum up, these results suggested that PVA/SA/CMC composite hydrogels with oriented structure might have potential applications in soft tissue repair and other biomaterials.
研究领域:
材料科学
·
生物医学工程
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Kun Li,Mohashin Kabir,Mahbubur Rahman,Shaojuan Chen
The development of advanced electrospun nanofiber yarns (ENYs) featuring highly aligned structures has garnered considerable attention, as these ENYs serve as fundamental building blocks for biomedical textile fabrication. In this work, we successfully fabricated highly aligned chitosan (CS)/poly(L-lactide-co-ε-caprolactone) (PLCL) ENYs through an innovative combination of electrospinning and thermal stretching techniques. Four CS/PLCL compositions were subjected to thermal stretching at 60 °C to generate 4 times stretching range, resulting in markedly improved fiber alignment and morphological characteristics. Mechanical characterization revealed an interesting trade-off: while Young’s modulus decreased post-stretching, elongation at break increased substantially, indicating enhanced material flexibility. Degradation studies demonstrated composition-dependent behavior, with higher CS content accelerating biodegradation rates. Notably, surface wettability was effectively tuned, as evidenced by water contact angle measurements decreasing dramatically from 130° to 69° with increasing CS content. Most importantly, the 1 % CS/PLCL formulation emerged as particularly promising, demonstrating exceptional antibacterial performance (86.2 % inhibition against E. coli ) coupled with outstanding human dermal fibroblast adhesion and proliferation. Comprehensive evaluation revealed that these highly aligned nanofibers, especially the 1 % CS/PLCL variant, achieved an optimal combination of structural properties (morphology and crystallinity), degradation kinetics, antibacterial efficacy, and biocompatibility.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
高分子科学
·
静电纺丝技术
✓ 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）