COMPOSITES SCIENCE AND TECHNOLOGY
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2023
·
IF 9.1
Dingxuan Zhao,Jiqiang Hu,Dongqing Wang,Jinchuan Yang,Hanqi Zhang,Bing Wang
High performance composites not only pursue high strength , light weight, but also need to have multifunctional characteristics. To further improve curing efficiency and mechanical properties of phthalonitrile resin (PN75) and give full play to its excellent thermal and dielectric properties , mica as reinforcement was introduced into PN75 to form particle-filled resin (Mica/PN75) and CFRP (Mica/PN75/CF) composites. The introduction of mica reduced the curing temperature of PN75 and improved the curing efficiency. The thermal stability of resin and composites was further improved. The bending strength of the two groups of mica reinforced resin increased by 44.87% and 55.97%, and the dielectric constant decreased from 3.3 to 2.7 and 2.5, respectively. The bending strength of the composites was increased by up to 19.9%, and the glass transition temperature of composites was increased by up to 26 °C after reinforcement. The multidirectional reinforcement of PN75 by mica was studied and analyzed in this work.
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Micromachines
·
2023
·Vol. 14
·期 10
·1911
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IF 3.4
Chuang Wu,Hanqi Jia,Haithm Yahya Mohammed Almuaalemi,A. S. M. Muhtasim Fuad Sohan,Binfeng Yin
The microfluidic technique for the three-dimensional (3D) printing of Janus droplets offers precise control over their size, orientation, and positioning. The proposed approach investigates the impact of variables such as the volume ratio of the oil phase, droplet size, and the ratio of nonionic surfactants on the dimensions of the structured color apertures of Janus droplets. The findings reveal that structured color apertures modulate accurately. Furthermore, fabricating color patterns facilitates cat, fish, and various other specific shapes using structured color Janus droplets. The color patterns exhibit temperature-sensitive properties, enabling them to transition between display and concealed states. Herein, the adopted microfluidic technique creates Janus droplets with customizable characteristics and uniform size, solving orientation as well as space arrangement problems. This approach holds promising applications for optical devices, sensors, and biomimetic systems.Keywords:microfluidic technology;structural color;Janus droplet;temperature-sensitive characteristics;hydrogel
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaochen Xiang,Jiao Wang,Qinglong Ru,Sumin Li,Ke Zhao,Yifei Zhu,Zhenpan Chen,Liangliang Liu,Guangqin Gu,Yu Jia,Bao Zhang,Gang Cheng,Zuliang Du
As the single electron transfer of CO 2 to CO 2 − ions is the critical step in the CO 2 activation, it is very important to develop appropriate strategies to construct efficient catalytic systems. Herein, we constructed a coupled catalytic system consisting of mechanical-energy-driven triboelectric plasma and indium oxide rich in oxygen vacancies to achieve CO 2 reduction to CO at room temperature and atmospheric pressure. At the discharge distance of 0.6 mm, the indium oxide with more oxygen vacancies exhibited an optimal catalytic activity of 0.20 mmol·g −1 ·h −1 for CO evolution rate, and the conversion efficiency from electrical to chemical energy was 10.8 %. Electron paramagnetic resonance experiments showed that a large amount of CO 2 − ions were generated in the triboelectric plasma. The introduction of oxygen vacancies could increase the density of states near the Fermi level of indium oxide catalysts, stabilize highly active CO 2 − ions, and reduce the energy barrier of CO 2 − decomposition.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Yuanyuan Chen,Hanqing Dai,Yukun Yan,Zhiyan Piao,Hanxu Lu,Zhe Hu,Wei Wei,Guoqi Zhang,Wanlu Zhang,Ruiqian Guo
In recent years, various functional fabrics capable of responding to multistimuli have been widely recognized as promising wearable devices. However, the obtained composite functional fabrics have only been applied in a few scenarios, rendering the achievement of multifunctional wearable application scenarios a difficult goal. Therefore, there is an urgent need to expand the diversity of wearable applications for functional fabrics. Herein, we design hydrogel composite fabrics capable of responding to multiple stimuli, including vibration, temperature, strain, and pressure, to enable wearable multiapplication scenarios. The hydrogel composite fabrics, based on nylon fabrics (NFs), are fabricated with polyacrylamide (PAM)–poly(vinyl alcohol) (PVA)–sodium alginate (SA)–reduced graphene oxide (rGO)/NFs (PAM–PVA–SA–rGO/NFs). The PAM–PVA–SA–rGO/NFs exhibit a higher elastic stiffness coefficient (2.79 N cm–1) than the blank NFs (1.76 N cm–1), good temperature sensitivity in the range of 30–80 °C, and excellent detecting ability for urine presence with a threshold of unit area of 2.55 × 10–3 mL cm–2. The PAM–PVA–SA–rGO/NFs can not only respond to multiple stimuli but also be integrated into clothing for wearable multiapplication scenarios, such as detecting human speaking and breathing, intelligent sleeves, and diaper alarms. Additionally, the mechanisms of the above phenomena are revealed. These results indicate that the PAM–PVA–SA–rGO/NFs will provide inspiration for the development of intelligence systems, feedback devices, soft robotics, wearable devices, etc.
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CARBON
·
2023
·
IF 10.9
Shenquan Yang,Lu Tang,Hanjun Wei,Jimei Xue,Zhijun Wang,Qingyuan Wang,Feng Zhao
Creating porous structures is a practical method for enhancing the impedance matching and interfacial polarization of dielectric materials , which in turn leads to improved electromagnetic (EM) wave absorption performance . However, the use of nanoparticles , nanorods , and two-dimensional materials to construct a simple porous structure typically has a minor effect on the EM parameters and interface polarization. To improve impedance matching and reduce the reflection of EM waves while simultaneously enhancing interfacial polarization, a more rational structure for dielectric materials is desired. Herein, a ytterbium oxide/reduced graphene oxide (Yb 2 O 3 /rGO) composite with a volcanic rock-like structure is proposed to exhibit outstanding impedance matching and loss capacity and achieve high EM wave performance. The addition of Yb 2 O 3 is utilized to induce the formation of porous structures with varying morphologies. Yb 2 O 3 not only significantly improves the polarization loss but also facilitates volcanic rock-like structure construction, thus improving the EM wave performance. As a result, the Yb 2 O 3 /rGO composites with a volcanic rock-like structure exhibit outstanding EM absorption performance, including three-band absorption (C, X, and Ku bands), as evidenced by their minimum reflection loss (RL min ) of −57.2 dB (equivalent to 99.9999% effective absorption) at 11.6 GHz when the matched thickness is 2.1 mm and an effective absorption bandwidth (EAB) of 4.2 GHz. Simulations in the CST microwave studio further validate the benefits of the composite's unique structure, which shows a radar cross-section (RCS) reduction value of up to 38.1 dB m 2 . This work offers valuable insights for the development of next-generation EM wave absorption materials through the implementation of a well-designed and distinctive structure.
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Advanced Science
·
2023
·Vol. 10
·期 31
·2304121
·
IF 15.1
Shengshun Duan,Xiao Wei,Fangzhi Zhao,Huiying Yang,Ye Wang,Pinzhen Chen,Jianlong Hong,Shengxin Xiang,Minzhou Luo,Qiongfeng Shi,Guozhen Shen,Jun Wu
As key interfaces for the disabled, optimal prosthetics should elicit natural sensations of skin touch or proprioception, by unambiguously delivering the multimodal signals acquired by the prosthetics to the nervous system, which still remains challenging. Here, a bioinspired temperature-pressure electronic skin with decoupling capability (TPD e-skin), inspired by the high-low modulus hierarchical structure of human skin, is developed to restore such functionality. Due to the bionic dual-state amplifying microstructure and contact resistance modulation, the MXene TPD e-skin exhibits high sensitivity over a wide pressure range and excellent temperature insensitivity (91.2% reduction). Additionally, the high-low modulus structural configuration enables the pressure insensitivity of the thermistor. Furthermore, a neural model is proposed to neutrally code the temperature-pressure signals into three types of nerve-acceptable frequency signals, corresponding to thermoreceptors, slow-adapting receptors, and fast-adapting receptors. Four operational states in the time domain are also distinguished after the neural coding in the frequency domain. Besides, a brain-like machine learning-based fusion process for frequency signals is also constructed to analyze the frequency pattern and achieve object recognition with a high accuracy of 98.7%. The TPD neural system offers promising potential to enable advanced prosthetic devices with the capability of multimodality-decoupling sensing and deep neural integration.
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高影响因子
Advanced Materials Technologies
·
2023
·Vol. 9
·期 4
·2301628
·
IF 6.8
Yongjie Yu,Haibo Xu,Enhai Song,Dengfeng Peng,Keyu Han,Shiqing Xu,Gongxun Bai
Flexible sensors have attracted extensive research interest due to their great application potential in biodetection, flexible display, and wearable devices. However, they still have a lot of room for improvement in terms of luminous color, flexibility, and self-powered systems. A wearable, antifreeze, and discoloration sensing system based on electroluminescence, mechanoluminescence, and tribo-power generation is developed in this paper. Triboelectric nanogenerator systems can harvest biomechanical energy from hand clapping and knee/elbow bending to generate real-time electrical signals. The use of dielectric materials reduces the initial voltage and frequency of light-emitting devices, enabling them to be driven by Triboelectric nanogenerators. At the same time, the device can produce red, blue, white, and other multicolor light. In addition, the system can produce an optical signal output due to external mechanical stimulation. As a result, the sensor system is simple to manufacture and unique to operate, proving its potential applications in areas such as cold-resistant displays, wearable optoelectronics, soft robotics, and electronic skin.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
·
IF 2.6
Jiale Wang,Guang Yao,Dong Hu,Sheng Huang,Junqi Liu,Quan Zhu
In order to investigate the interactive effect on the density of two-component mixtures, six mixtures of methylcyclohexane(1) + n-dodecane(2)/n-tetradecane(2)/n-hexadecane(2) and ethylcyclohexane(1) + n-dodecane(2)/n-tetradecane(2)/n-hexadecane(2) were measured by using the Anton Paar DMA 4200 M densimeter and a hand-operated pressure pump in the temperature and pressure ranges of T = 280 to 423.15 K and P = 0.1 to 9 MPa, respectively. Additionally, the combined standard uncertainty in the density of binary mixtures with n-hexadecane is uc(ρ) = 1.543 kg/m3, and for other mixtures, it is uc(ρ) = 1.541 kg/m3. The experimental data were successfully correlated with the empirically modified Toscani–Szwarc equation of state with a maximum regression deviation of less than 1.0630 kg/m3 for all the binary mixtures. On the basis of the experimental data and parameters of the regression model, isobaric thermal expansivity and isothermal compressibility were calculated and exhibited nonlinear behavior against the mole fraction, which is due to different molecular interactions between the two components.
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Materials
·
2023
·Vol. 17
·期 1
·157
·
IF 3.4
Dongyang Qiao,Feng Shi,Ye Tian,Wanli Zhang,Lingbo Xie,Shuangpeng Guo,Ci Song,Guipeng Tie
Single-crystal silicon carbide has excellent electrical, mechanical, and chemical properties. However, due to its high hardness material properties, achieving high-precision manufacturing of single-crystal silicon carbide with an ultra-smooth surface is difficult. In this work, quantum dots were introduced as a sacrificial layer in polishing for pulsed-ion-beam sputtering of single-crystal SiC. The surface of single-crystal silicon carbide with a quantum-dot sacrificial layer was sputtered using a pulsed-ion beam and compared with the surface of single-crystal silicon carbide sputtered directly. The surface roughness evolution of single-crystal silicon carbide etched using a pulsed ion beam was studied, and the mechanism of sacrificial layer sputtering was analyzed theoretically. The results show that direct sputtering of single-crystal silicon carbide will deteriorate the surface quality. On the contrary, the surface roughness of single-crystal silicon carbide with a quantum-dot sacrificial layer added using pulsed-ion-beam sputtering was effectively suppressed, the surface shape accuracy of the Ø120 mm sample was converged to 7.63 nm RMS, and the roughness was reduced to 0.21 nm RMS. Therefore, the single-crystal silicon carbide with the quantum-dot sacrificial layer added via pulsed-ion-beam sputtering can effectively reduce the micro-morphology roughness phenomenon caused by ion-beam sputtering, and it is expected to realize the manufacture of a high-precision ultra-smooth surface of single-crystal silicon carbide.
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高影响因子
Membranes
·
2021
·Vol. 11
·期 2
·130
·
IF 4.106
Chabi Noël Worou,Jing Kang,Jimin Shen,Pengwei Yan,Weiqiang Wang,Yingxu Gong,Zhonglin Chen
A defect-free, loose, and strong layer consisting of zirconium (Zr) nanoparticles (NPs) has been successfully established on a polyacrylonitrile (PAN) ultrafiltration substrate by an in-situ formation process. The resulting organic–inorganic nanofiltration (NF) membrane, NF-PANZr, has been accurately characterized not only with regard to its properties but also its structure by the atomic force microscopy, field emission scanning electron microscopy, and energy dispersive spectroscopy. A sophisticated computing model consisting of the Runge–Kutta method followed by Richardson extrapolation was applied in this investigation to solve the extended Nernst–Planck equations, which govern the solute particles’ transport across the active layer of NF-PANZr. A smart, adaptive step-size routine is chosen for this simple and robust method, also known as RK4 (fourth-order Runge–Kutta). The NF-PANZr membrane was less performant toward monovalent ions, and its rejection rate for multivalent ions reached 99.3%. The water flux of the NF-PANZr membrane was as high as 58 L · m−2· h−1. Richardson’s extrapolation was then used to get a better approximation of Cl−and Mg2+rejection, the relative errors were, respectively, 0.09% and 0.01% for Cl−and Mg2+. While waiting for the rise and expansion of machine learning in the prediction of rejection performance, we strongly recommend the development of better NF models and further validation of existing ones.Keywords:zirconium nanoparticles;soft computing;salt rejection;nanofiltration membrane;Runge–Kutta numerical method;Richardson’s extrapolation
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CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Jingbo Ni,Ruyi Liu,Changhao Yan
Poly(styrene-acrolein) (P(St-AL)) spheres were first prepared through the copolymerization of styrene and acrolein , and then P(St-AL)/reduced graphene oxide (r-GO) nanocomposites were constructed via in-situ reduction of graphite oxide (GO) in the presence of sodium borohydride. Morphologies and physicochemical properties were characterized by TEM, Raman, XRD, XPS and Insulation resistance tester. The results showed the optimal r-GO volume fraction for synthesis and anticorrosion properties of nanocomposites was 0.98 vol%. The electrochemical tests in artificial seawater further revealed that P(St-AL)/r-GO nanocomposites could efficiently improve the anticorrosion performance of the waterborne acrylic resin coating due to the high conductivity and excellent physical barrier.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Zeming Gu,Jun Qian,Ran Wang,Meilin Lv,Xiaoxiang Xu,Chun Luo
Layered Aurivillius compound Bi 5 Ti 3 CrO 15 has been synthesized by a hydrothermal method for the application as a photocatalyst to liberate hydrogen from water. Bi 5 Ti 3 CrO 15 owns a narrow band gap ( E g ~2.46 eV) and shows stable photocatalytic activity under both full range ( λ ≥250 nm) and visible light illumination ( λ ≥420 nm). A short hydrothermal reaction time is critical to achieve high photocatalytic activity as defects such as Cr 6+ and Bi 5+ can be avoided. An AQE as high as 3.66% at 420 nm ± 20 nm has been recorded, warranting promising application in the field of solar energy conversions. DFT calculation reveals the important role of Cr 3+ cations for visible light sensitivity of Bi 5 Ti 3 CrO 15 .
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