JOURNAL OF ELECTRONIC MATERIALS
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2017
·Vol. 47
·期 2
·1705-1712
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IF 1.579
Han Jing,Wang Yan,Tan Shihai,Guo Fu
Electromigration is a major reliability problem in composite solder joints. Due to the anisotropy of the β -Sn crystal structure, the Sn grain orientations present in the solder matrix dominate the principal failure mechanism in solder joints under electric current stressing. In this work, the Cu 6 Sn 5 growth behavior in Cu 6 Sn 5 -reinforced composite solder joints with three different Sn grain orientations was investigated at current density of 10 4 A/cm 2 at room temperature. Micron-sized Cu particles were added to Sn-3.5Ag solder at 2% volume fraction using an in situ method. After current stressing for 528 h, the polarity effect in the composite solder joint was greatest for an angle ( θ ) between the c -axis and electron flow direction of 30°, resulting in higher growth rate of Cu 6 Sn 5 in the solder matrix compared with composite solder joints with θ of 60° or 90°. There were no noticeable changes in the composite solder joint with θ of 90°. The growth behavior of Cu 6 Sn 5 , Cu atomic motion, and Cu diffusivity in the composite solder joints with different Sn grain orientations were analyzed in detail.
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FIBERS AND POLYMERS
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2017
·Vol. 18
·期 10
·1975-1980
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IF 1.113
Li Mingzhuan,Li Zhanyu,Wang Jun,Wang Caihong,Lu Shengjun
In this work, a simple and low cost method based on screen printing is presented to synthesize a conductive silver pattern on aramid fabric. The aramid fiber was treated with (3-mercaptopropyl)-trimethoxysilane to introduce a tail mercapto group promoting the ordered binding of silver nanoparticles. SEM and AFM images indicated a uniform distribution of silver nanoparticles on fiber surface. FTIR and XRD patterns confirmed the silver layer on the fibers. Furthermore, the electrical property of conductive fiber was characterized by conductive AFM and a digital multimeter, the surface resistance of conductive fabric was as low as 0.20 Ω/cm. And single fiber tensile test indicated that the mild treating process has no significant influence on the mechanical properties of the fiber.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 6
·946-950
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IF 1.024
Ji Ye,Han Tianyi,Zhang Yong,Wang Ziying,Zhang Tong,Leng Jiyan
Ag nanocubes-reduced graphene oxide(AgNCs-rGO) nanocomposite was successfully prepared by an in situ synthesis method, in which AgNCs were loaded onto the surface of rGO during the formation of AgNCs in an ethylene glycol solution. Characterization by X-ray diffraction, UV-Vis spectroscopy, and scanning electron microscopy indicated the successful preparation of the AgNCs-rGO nanocomposite. Most importantly, the AgNCs-rGO nanocomposite exhibited excellent electrocatalytic activity for the reduction of H 2 O 2 , leading to a high-performance non-enzymatic H 2 O 2 sensor with a linear detection range and detection limit of approximately 0.1 mmol/L to 70 mmol/L( r =0.999) and 0.58 μmol/L, respectively. Our present work provides a new and highly efficient method for fabricating high-performance electrochemical sensors.
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MICROCHIMICA ACTA
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2024
·Vol. 191
·期 6
·1-11
·
IF 5.3
Liu Zhiguang,Niu Ruxia,Li Miaomiao,Li Zhiping,Guo Yujing
Developing convenient and reliable methods for Hg 2+ monitoring is highly important. Some precious metal nanomaterials with intriguing peroxidase-like activity have been used for highly sensitive Hg 2+ detection. However, H 2 O 2 must be added during these detections, which impedes practical applications of Hg 2+ sensors due to its susceptible decomposition by environmental factors. Herein, we discovered that the combination of Hg 2+ and palladium metal-organic framework@graphene (Pd-MOF@GNs) exhibits oxidase-like activity (OXD). In the absence of H 2 O 2 , this activity not only catalyzes the oxidation of chromogenic substrates such as 3,3',5,5'-tetramethylbenzidine (TMB) or o-phenylenediamine (OPD) to produce a color change but also enhances the electrical signals during OPD oxidation. Based on these properties, an effective and convenient dual-mode colorimetric and electrochemical sensor for Hg 2+ has been developed. The colorimetric and amperometric linear relationships for Hg 2+ were 0.045 μM—0.25 mM and 0.020 μM—2.0 mM, respectively. The proposed strategy shows good recovery in real sample tests, indicating promising prospects for multiple environmental sample detection of Hg 2+ without relying on H 2 O 2 . The colorimetric and electrochemical dual-mode Hg 2+ sensor is expected to hold great potentials in applications such as environmental monitoring, rapid field detection, and integration into smartphone detection of Hg 2+ . Graphical abstract
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Biomass Conversion and Biorefinery
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2024
·
IF 3.5
Yao Pin,Yan Tinggui,Dai Xin,Xiao Ya,Xiang Weixue,Wu Yunqi
Deposition and corrosion in boilers caused by the release of alkali compounds in agricultural residua pose significant challenges to the widespread utilization of biomass energy. Phosphate tailings (PT), which is rich in Ca, Mg, and P, have the potential to mitigate the potassium (K) release of biomass straw. However, the impact of PT on K immigration has not been investigated. To elucidate the influence of PT on K immigration, thermal analysis, K concentration determination, and mineral evolution during heating of ash were conducted. These results were compared with those obtained from biomass mixed with kaolin, an effective additive known to alleviate K release in biomass. The findings revealed that PT resulted in lower K release at temperatures below 600 ℃ compared to kaolin. Because the reaction between PT and K-compounds to form K-phosphate occurs more readily than the formation of K-silicate at lower temperatures. However, the effectiveness of PT diminished as the temperature increased. One reason is the decomposition of K-phosphate, resulting in the volatilization of K at higher temperatures. Another reason is the competition among Ca, Mg, and K for the opportunity to react with Si and Al, leading to the formation of more stable Ca and Mg aluminosilicate and facilitating the release of K. It is noteworthy that the addition of kaolin to rice straw causes a violent release of K in 1000–1200 ℃. This can be attributed to the surplus of Si in the system, promoting the release after the eutectic melting between K-silicate and SiO 2 .
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Science China-Materials
·
2025
·
IF 7.4
Zhao Yuefang,Yang Huabin,Zhang Qirui,Lei Cheng,Zhou Na,Shi Rongrui,Shi Lei,Wu Jintao,Luo Houming,Mao Haiyang
This work proposes a fabrication technique that can achieve wafer-level preparation of flexible interdigital electrodes (IDEs) with high-density and large-thickness (HD<). Utilizing these HD< flexible IDEs, we developed a flexible humidity sensor that employs a composite material made of nanowire bundles with carbon quantum dots (CQDBs) for humidity sensitivity. In this device, the composite material facilitates high absorption and capillary condensation of water molecules across various relative humidity (RH) conditions, while the HD< IDEs enhance the effective sensing area. Consequently, we achieve a flexible humidity sensor with exceptional performance. This sensor not only boasts key attributes such as low cost, easy fabrication, and straightforward operation but also establishes a foundation for extensive humidity sensing applications. In comparison to other devices utilizing small-thickness and low-density IDEs, our sensor demonstrates remarkable 2.5-fold and 5.8-fold increase in sensitivity across humidity ranges of 7%–59% RH and 59%–97% RH, respectively. To explore the practical applications of the device, we demonstrate its functionality in diaper humidity detection. With characteristics of wearability and durability, the sensor shows significant potential for humidity monitoring in wearable electronics.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-15
·
IF 14.7
Zhong Tianyan,Yi Hangjin,Gou Jiacheng,Li Jie,Liu Miao,Gao Xing,Chen Sizhu,Guan Hongye,Liang Shan,He Qianxiong,Lin Rui,Long Zhihe,Wang Yue,Shi Chuang,Zhan Yang,Zhang Yan,Xing Lili,Zhong Jie,Xue Xinyu
The proper axial length of the eye is crucial for achieving emmetropia. In this study, we present a wireless battery-free eye modulation patch designed to correct high myopia and prevent relapse. The patch consists of piezoelectric transducers, an electrochemical micro-actuator, a drug microneedle array, μ-LEDs, a flexible circuit, and biocompatible encapsulation. The system can be wirelessly powered and controlled using external ultrasound. The electrochemical micro-actuator plays a key role in precisely shortening the axial length by driving the posterior sclera inward. This ensures accurate scene imaging on the retina for myopia eye. The drug microneedle array delivers riboflavin to the posterior sclera, and μ-LEDs’ blue light induces collagen cross-linking, reinforcing sclera strength. In vivo experiments demonstrate that the patch successfully reduces the rabbit eye’s axial length by ~1217 μm and increases sclera strength by 387%. The system operates effectively within the body without the need for batteries. Here, we show that the patch offers a promising avenue for clinically treating high myopia.
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Carbon Letters
·
2024
·Vol. 34
·期 6
·1693-1706
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IF 5.5
Huang Ruifeng,Xu Chenghao,Feng Zuyong,He Miao,Wen Kunhua,Chen Li,Liang Tong,Xiong Deping
This study comprehensively investigates three types of graphite materials as potential anodes for potassium-ion batteries. Natural graphite, artificial carbon-coated graphite, and mesocarbon microbeads (MCMB) are examined for their structural characteristics and electrochemical performances. Structural analyses, including HRTEM, XRD, Raman spectroscopy, and laser particle size measurements, reveal distinct features in each graphite type. XRD spectra confirm that all graphites are composed of pure carbon, with high crystallinity and varying crystal sizes. Raman spectroscopy indicates differences in disorder levels, with artificial carbon-coated graphite exhibiting the highest disorder, attributed to its outer carbon coating. Ex-situ Raman and HRTEM techniques on the electrodes reveal their distinct electrochemical behaviors. MCMB stands out with superior stability and capacity retention during prolonged cycling, attributed to its unique spherical particle structure facilitating potassium-ion diffusion. The study suggests that MCMB holds promise for potassium-ion full batteries. In addition, artificial carbon-coated graphite, despite challenges in hindering potassium-ion diffusion, may find applications in commercial potassium-ion battery anodes with suitable coatings. The research contributes valuable insights into potassium-ion battery anode materials, offering a significant extension to the current understanding of graphite-based electrode performance.
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Nano-Micro Letters
·
2024
·Vol. 16
·期 1
·1-19
·
IF 31.6
Gai Lixue,Wang Yahui,Wan Pan,Yu Shuping,Chen Yongzheng,Han Xijiang,Xu Ping,Du Yunchen
Microwave absorbing materials (MAMs) characterized by high absorption efficiency and good environmental tolerance are highly desirable in practical applications. Both silicon carbide and carbon are considered as stable MAMs under some rigorous conditions, while their composites still fail to produce satisfactory microwave absorption performance regardless of the improvements as compared with the individuals. Herein, we have successfully implemented compositional and structural engineering to fabricate hollow SiC/C microspheres with controllable composition. The simultaneous modulation on dielectric properties and impedance matching can be easily achieved as the change in the composition of these composites. The formation of hollow structure not only favors lightweight feature, but also generates considerable contribution to microwave attenuation capacity. With the synergistic effect of composition and structure, the optimized SiC/C composite exhibits excellent performance, whose the strongest reflection loss intensity and broadest effective absorption reach − 60.8 dB and 5.1 GHz, respectively, and its microwave absorption properties are actually superior to those of most SiC/C composites in previous studies. In addition, the stability tests of microwave absorption capacity after exposure to harsh conditions and Radar Cross Section simulation data demonstrate that hollow SiC/C microspheres from compositional and structural optimization have a bright prospect in practical applications.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-12
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IF 3.9
Huang Rongfu,Yao Jianfeng,Liu Lei,Li Hua,Huang Baoshan
This study investigated the role of LRRC42 in tumor development and progression using comprehensive methodologies. Analysis of RNA-seq data from the TCGA database revealed that LRRC42 expression is upregulated in various tumor tissues, including bladder cancer (BLCA), breast cancer (BRCA), cholangiocarcinoma (CHOL), colorectal cancer (COAD), esophageal cancer (ESCA), glioblastoma (GBM), head and neck squamous cell carcinoma (HNSC), liver hepatocellular carcinoma (LIHC), lung adenocarcinoma (LUAD), and skin cutaneous melanoma (SKCM), compared to normal tissues. Conversely, LRRC42 was significantly downregulated in kidney chromophobe (KICH) and thyroid carcinoma (THCA) tissues. Single-cell analysis using the TISCH2 database highlighted high LRRC42 expression levels in specific subpopulations across different cancers. Correlation analyses indicated associations between LRRC42 expression and prognosis in multiple tumors, linking it to poor overall survival in several cancer types. Investigations into LRRC42’s interactions with the tumor immune microenvironment and signaling pathways demonstrated significant correlations with immune cells, epithelial-mesenchymal transition molecules, autophagy-related factors, and pyroptosis-related molecules. Focusing on LRRC42’s potential role in hepatocellular carcinoma (HCC), the study uncovered co-expression relationships with Th2 cells and identified genes enriched in mRNA processing and cell cycle regulation pathways. Functional validation through LRRC42 knockdown experiments revealed its critical involvement in promoting cell proliferation, migration, and invasion in HCC cell lines. Collectively, these findings emphasize LRRC42 as a promising therapeutic target for inhibiting HCC progression and suggest its pivotal role in modulating key cellular processes integral to HCC advancement.
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JOURNAL OF FLUORESCENCE
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2025
·
IF 3.1
Zhang Hongmei,Yang Yunxia,Wang Yanqing
Sudan dyes are recognized as carcinogens, which are strictly determined whether there are them in food for food safety. Hence, in order to understand the mechanism at the molecular level, this work investigated the binding interactions of Sudan I-IV with calfthy mus DNA. The synchronous fluorescence and UV–vis spectral results suggested the complex formation between Sudan I-IV and ct-DNA. EB and Hoechst 33258 displacement experimental results confirmed the binding sites of Sudan I-IV in ct-DNA and the minor groove-binding mode of Sudan I-IV with ct-DNA. The molecular modeling computational method also proved binding mode, which is consistent with the spectral experiments. In addition, the aromatic rings of Sudan I-IV play important roles in binding with DNA. Compared to Sudan I and II, the increase of molecular conjugation system enhances the binding abilities of Sudan III and Sudan IV with DNA. Vdm + Hbond + desolv energies of them are the main contribution of their combined energies.
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ANALYTICAL SCIENCES
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2025
·
IF 2
Wang Mengge,Chen Xiaofeng,Wang Zhigang,Li Ming
Ionic liquids (ILs) which belong to the molten salt of a high ionic environment exhibit a number of unique properties, including the formation of various heterogeneities in their microemulsion. We found that auto-generated radicals within a [Bmim][PF 6 ]/[C 16 mim][PF 6 ]/PBS reverse micelles (IL-RMs) and then the radicals were quantified in this study. For the radical confirmation, EPR spectroscopy with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) free radical scavenger was carried out. A spectroscopic chemical probe of 1,1-diphenyl-2-picrylhydrazine (DPPHH) was employed to quantify the radicals in the IL-RM systems. The mechanism of the radical generation was also proposed. The DPPHH probe method is simple, rapid, and sensitive to quantify free radicals in the IL-RM systems. Finally, IL-RMs were successfully applied to degrade Rhodamine B (Rho-B) dye with low degradation cost, simple operation, short time consumption, and remarkable degradation effect. The results show a near 100% degradation rate for 10 μmol·L −1 Rho-B in the IL-RMs system with pH 7.4 PBS containing 1 mmol·L −1 chloroacetic acid as an aqueous phase. Graphical abstract
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危险品化学品经营许可证（带存储）