International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 7
·1407-1416
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IF 4.8
Pang Xiaoxiao,Wang Tingting,Liu Bin,Fan Xiayue,Liu Xiaorui,Shen Jing,Zhong Cheng,Hu Wenbin
Tetragonal barium titanate was synthesized from barium hydroxide octahydrate and titanium tetrachloride through a simple one-step hydrothermal method. The effect of different solvents on the crystal structure and morphology of barium titanate nanoparticles during the hydrothermal process was investigated. Except for ethylene glycol/water solvent, impurity-free barium titanate was synthesized in pure water, methanol/water, ethanol/water, and isopropyl alcohol/water mixed solvents. Compared with other alcohols, ethanol promotes the formation of a tetragonal structure. In addition, characterization studies confirm that particles synthesized in methanol/water, ethanol/water, and isopropyl alcohol/water mixed solvents are smaller in size than those synthesized in pure water. In the case of alcohol-containing solvents, the particle size decreases in the order of isopropanol, ethanol, and methanol. Among all the media used in this study, ethanol/water is considered the optimum reaction media for barium titanate with high tetragonality (defined as the ratio of two lattice parameters c and a, c/a = 1.0088) and small average particle size (82 nm), which indicates its great application potential in multilayer ceramic capacitors.
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Nano Research
·
2023
·Vol. 16
·期 7
·10215-10221
·
IF 9.9
Hu Qianqing,Si Junjie,Chen Desui,Hao Xiaoming,Xu Rui,Du Yihang,Du Zhuopeng,Gong Xinquan,Zhao Hong,Cai Peiqing,Ai Qi,Yao Xin,Yan Yu,Zhang Zenan,Cai Muzhi,Liu Wei,Kang Yongyin,Liu Zugang
All-solution-processed inverted quantum dot (QD) light-emitting diodes (QLEDs) with transparent bottom cathodes can be directly connected to the n-type thin-film transistors, offering a feasible solution for low-cost active matrix-driven QD displays. However, the subsequent solution-deposition of the hole-transporting layer destroys the underneath QD films, resulting in largely deteriorated device performance. Various strategies have been implemented to prevent QD film from dissolution, but all at a heavy cost of device performance suffering from either reduced efficiency or increased driving voltage. Here, a facile and effective water-treatment approach for QD film to fabricate inverted QLEDs through all solution processing is reported. The water treatment substitutes the long-chain oleate ligands with hydroxyl groups, resulting in significantly improved non-polar solvent resistance of the QD films. Importantly, the QD films reserve their excellent photoluminescence efficiency after water treatment. With the water-treated QD film as the emissive layer, all-solution-processed inverted red QLED with a peak external quantum efficiency of 19.6%, a turn-on voltage of 1.8 V, and a T 50 operational lifetime of 150,000 h at 100 cd·m −2 was achieved. Furthermore, efficient and low-voltage-driven green and blue QLEDs can also be prepared with this method. This work provides a feasible strategy for the fabrication of high-performance all-solution-processed inverted QLEDs, paving the way toward achieving QLEDs by all ink-jet printing.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-19
·
IF 26.6
Wang Huawei,Gao Jialong,Chen Changli,Zhao Wei,Zhang Zihou,Li Dong,Chen Ying,Wang Chenyue,Zhu Cheng,Ke Xiaoxing,Pei Jiajing,Dong Juncai,Chen Qi,Jin Haibo,Chai Maorong,Li Yujing
A hybrid electrocatalyst consisting of PtNi-W alloy nanocrystals loaded on carbon surface with atomically dispersed W sites was realized.
Single-atomic W formed protonic acid sites and established an extended proton transport network at the catalyst surface.
Peak power density is enhanced by 64.4% compared to that with the commercial Pt/C catalyst in fuel cell as cathode at ultra-low loading of 0.05 mg Pt cm −2 .
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 3
·1-17
·
IF 20.1
Peng Jian,Kang Xiheng,Zhao Siyu,Yin Yongjun,Zhao Peitao,Ragauskas Arthur J.,Si Chuanling,Song Xueping
Hydrochar (HC), obtained by the hydrothermal carbonization (HTC) of biomass, is an excellent precursor for preparing activated carbon (AC). However, the effects of the intrinsic properties of HC on the microstructure and electrochemical properties of AC are largely unknown. This study investigates the impact of particle size and the degree of aromatization of in-situ HC on the microstructure and electrochemical properties of AC. Our results show that a large particle size and a high degree of aromatization help protect the HC from overactivation by ZnCl 2 , resulting in an large specific surface area (SSA > 2000 m 2 /g) and high mesopore to micropore volume ratio value ( V mes /V mic > 0.3) of the AC. Electrochemical performance measurements show a maximum specific capacitance of 218 F/g at 0.5 A/g was achieved in all samples where the AC (AC180-10 h) was prepared by activating HC180-10 h with a large size, a high degree of aromatization, and abundant surface oxygen-containing functional groups. After AC180-10 h was assembled into a supercapacitor, the specific capacitance of AC180-10 h still reached 158 F/g at 0.5 A/g, and it showed excellent cycling stability. This study advances the understanding of the impact of HC particle size and degree of aromatization on AC properties, providing new insights into tailoring HC qualities so that improving improve the properties of AC.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 27
·70827-70841
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IF 5.8
Hao Mengqi,Wu Wei,Habibul Nuzahat,Chai Guang,Ma Xiaoli,Ma Xiaoqian
Excessive phosphate content input into natural water can lead to the waste of resource and eutrophication. Biochar is a kind of low-cost adsorbent. However, its adsorption capacity for phosphate is low. In order to solve this problem, Fe compound-modified fly ash/cotton stalk biochar composites (Fe-FBC) were prepared through co-pyrolyzed fly ash and cotton stalk at 800℃, followed by infiltration of FeSO 4 solution. The samples were characterized by scanning electron microscopy, Brunauer–Emmett–Teller, X-ray diffraction, Fourier transform infrared spectroscopy, and zeta potential. After modification, the hydrophilicity and polarity of Fe-FBC increased. In addition, the pore volume, specific surface area, and surface functional groups were significantly improved. The adsorption behavior of Fe-FBC for the removal of phosphate from water can be well fitted by the pseudo-second-order kinetic and Sips isotherm adsorption model, with a maximum adsorption capacity of 47.91 mg/g. Fe-FBC maintained a high adsorption capacity in the pH range of 3–10. The coexisting anions (NO 3 − , SO 4 2− , and Cl − ) had negligible effects on phosphate adsorption. The adsorption mechanisms of Fe-FBC include electrostatic attraction, ligand exchange, surface complexation, ion exchange, chemical precipitation, and hydrogen bonding. Moreover, the desorption process of phosphate was investigated, indicating that the phosphate-saturated Fe-FBC could use as slow-release phosphate fertilizer. This study proposed a potentially environmental protection and recycling economy approach, which consists of recycling resources and treating wastes with wastes.
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JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 6
·1797-1806
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IF 2.6
Zhang Tao,Zhang Wentao,Li Yang,Hu Xiulei,Yuan Haoxiang,Jiang Tianyan
Flexible pressure sensor plays a crucial role in wearable devices since it converts the physical signals of human motions into electrical signals. Among various pressure sensors, foam-based pressure sensors received great attention due to their excellent flexibility, low weight, and pressure resistance. However, the sensitivity of the foam-based pressure sensor is still not large enough, and the sensing range is also urged to be further improved. Herein, we proposed a high-performance foam-based pressure sensor composed of polydimethylsiloxane (PDMS), multi-walled carbon nanotubes (MWCNT), and nanofibers (FIBER). The PDMS/FIBER@MWCNT foam-based pressure sensor possessed outstanding sensitivity up to 4.07 kPa − 1 and a wide sensing range of 0–70 kPa. The pressure sensor also presented excellent linearity during 0–20 kPa and 20–70 kPa, respectively. And 2000 cyclic compression tests shown good cyclic stability. Meanwhile, the pressure sensor worked efficiently in monitoring subtle and large human motions, such as finger bending, wrist bending, throat vocal signals, and various pressures. In addition, the pressure sensor owned significant discrimination and high efficiency against different pressure, which is beneficial in human complex motion monitoring and signal analysis of wearable devices. Consequently, the PDMS/FIBER@MWCNT foam-based pressure sensor may possess promising prospects and potential in the applications of artificial electrical skin and wearable devices.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 107
·期 11
·3745-3761
·
IF 5
Xu Chenglong,Lin Wenxi,Chen Yunni,Gao Boliang,Zhang Zhibin,Zhu Du
Perylenequinones (PQs) are a class of natural polyketides used as photodynamic therapeutics. Heat stress (HS) is an important environmental factor affecting secondary metabolism of fungi. This study investigated the effects of HS treatment on PQs biosynthesis of Shiraia sp. Slf14(w) and the underlying molecular mechanism. After the optimization of HS treatment conditions, the total PQs amount reached 577 ± 34.56 mg/L, which was 20.89-fold improvement over the control. Also, HS treatment stimulated the formation of intracellular nitric oxide (NO). Genome-wide analysis of Shiraia sp. Slf14(w) revealed iNOSL and cNOSL encoding inducible and constitutive NOS-like proteins (iNOSL and cNOSL), respectively. Cloned iNOSL in Escherichia coli BL21 showed higher nitric oxide synthase (NOS) activity than cNOSL, and the expression level of iNOSL under HS treatment was observably higher than that of cNOSL , suggesting that iNOSL is more responsible for NO production in the HS-treated strain Slf14(w) and may play an important role in regulating PQs biosynthesis. Moreover, the putative biosynthetic gene clusters for PQs and genes encoding iNOSL and nitrate reductase (NR) in the HS-treated strain Slf14(w) were obviously upregulated. PQs biosynthesis and efflux stimulated by HS treatment were significantly inhibited upon the addition of NO scavenger, NOS inhibitor, and NR inhibitor, indicating that HS-induced NO, as a signaling molecule, triggered promoted PQs biosynthesis and efflux. Our results provide an effective strategy for PQs production and contribute to the understanding of heat shock signal transduction studies of other fungi.
Key points
• PQs titer of Shiraia sp. Slf14(w) was significantly enhanced by HS treatment . • HS-induced NO was first reported to participate in PQs biosynthetic regulation . • Novel inducible and constitutive NOS-like proteins (iNOSL and cNOSL) were obtained and their NOS activities were determined .
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CELLULOSE
·
2023
·Vol. 30
·期 9
·5669-5686
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IF 5.7
Liu Xiaorong,Yu Zhenyu,Li Hongji,Zhang Tao,Dong Youming,Wang Kaili,Zhan Xianxu,Li Yanjun,Li Jianzhang
Plant protein-based adhesives are considered to be the most potential substitutes for petroleum-based adhesives in the wood panel industry, however, the poor water resistance and unsatisfactory mechanical performance limit their large-scale application. Moreover, the development of multifunctional plant protein-based adhesives with high strength, mildew proof, and flame-retardant remains a challenge. Plant fibers have been widely used as the reinforcing phase of polymers, but the smooth surface makes them easy to pull out of the matrix, which greatly reduced the strengthening effect. Herein, the phenylboronic acid-tethered hierarchical rough kenaf fibers were constructed to strengthen soy meal (SM) adhesives while imparting multifunction. The hierarchical rough structures and reactive groups on the surface of kenaf fibers made them form stronger mechanical interlocking and chemical crosslinking with SM matrix, coupled with the entanglement and interpenetration of the fibers with a high aspect ratio, which together endowed the SM adhesive with outstanding water-resistant bonding strength. The wet shear strength of the plywood prepared by the resultant SM adhesive increased by 391.7% to 1.18 MPa, which was far higher than the standard of 0.7 MPa for type II plywood (GB/T 9846-2015) in Chinese standards. Benefiting from the phenylboronic acid component, the resultant SM adhesive exhibited excellent mildew-proof and flame-retardant properties. This biomimetic design of kenaf fibers provides a facile and efficient strategy to develop high-performance and multifunctional bio-adhesives. Graphical Abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 12
·1-10
·
IF 2.8
Niu Linyan,Sun Xinjie,Yang Yunxia,Yuan Xiao,Tong Hua
Inorganic glass solder has high application potential in laser sealing of electronic components, but its ability to convert light energy into heat energy still needs to be further improved. This paper demonstrates that graphene can help bismuthate glass solder perform much better in laser sealing. As demonstrated here, the shear strength (bonding strength) of the seal had more than doubled. However, in order to obtain the maximum shear strength, the optimum mass content of graphene should be ca. 0.5–1.0%, because cracks may form at the interface between graphene and glass, thus reducing the mechanical strength. The further results show that the participation of graphene led to improvement in the photothermal conversion efficiency of the glass solder, and favorable changes in the flow characteristics of the glass melt. When only 1% graphene was added, the photothermal conversion efficiency of the glass solder under 915 nm laser increased from 48.4 to 60.1%, which is very close to 64.3% of graphene alone. In addition, the contact angle between glass melt and quartz glass chip was reduced from around 140° to 25°, implying more beneficial fluidity and wettability.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Ding Hongbo,Wang Jue,Zhou Jiang,Wang Chengxin,Lu Bingan
In nature, the human body is a perfect self-organizing and self-repairing system, with the skin protecting the internal organs and tissues from external damages. In this work, inspired by the human skin, we design a metal electrode skin (MES) to protect the metal interface. MES can increase the flatness of electrode and uniform the electric field distribution, inhibiting the growth of dendrites. In detail, an artificial film made of fluorinated graphene oxide serves as the first protection layer. At molecular level, fluorine is released and in-situ formed a robust SEI as the second protection “skin” for metal anode. As a result, Cu@MES | | K asymmetric cell is able to achieve an unprecedented cycle life (over 1600 cycles). More impressively, the full cell of K@MES | | Prussian blue exhibits a long cycle lifespan over 5000 cycles. This work illustrates a mechanism for metal electrode protection and provides a strategy for the applying bionics in batteries.
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Science China-Materials
·
2023
·Vol. 66
·期 7
·2843-2851
·
IF 8.1
Xia Shan,Fu Wei,Liu Jiahao,Gao Guanghui
Ionic conductive hydrogels have emerged as one of the most promising alternatives to wearable sensors for human motion detecting, owing to their unique advantages in biocompatibility, conductivity and flexibility. However, the current hydrogel electronics still face the limitations of non-reusability and single-signal detection capability. Here, an ionic conductive hydrogel based on polyvinyl alcohol, sodium alginate fibers, and collagen was prepared by simulating the network structure and ion conduction mechanism of organisms for dual-mode signal acquisition of human motion and electrophysiological signals. Through the synergistic regulation of sodium alginate fibers and collagen, the hydrogels exhibit skin-like mechanical properties with low modulus, high toughness, and fatigue resistance to maximize the wearing comfort and motion detection capabilities of hydrogel wearable sensors. Furthermore, the hydrogel conductors with ion-transporting behavior close to organisms can be used as epidermal electrodes to collect the epidermis biopotential containing important human physiological information. As a result, through the rational design and assembly of wearable devices, hydrogels can be used to not only continuously and accurately identify whole-body motion signals, but also collect different electrophysiological signals such as electromyogram and electrocardiogram signals. Notably, the hydrogel based on the non-covalent cross-linked structure is completely recyclable, which can be arbitrarily reconstituted into new electronic devices while retaining the original function, improving the reusability of the hydrogels and reducing electronic waste.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 14
·2775-2780
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IF 4.3
Jin Shanxia,Li Yaqin,Yang Liuquan,Li Wei,Zhou Ping
The affinity interactions between boronic acids and sugars have been successfully exploited in many fields, such as the sensing of saccharides, selective enrichment of glycoconjugates, and drug delivery. However, despite multiple techniques having been adopted to investigate the reaction of boronate affinity, the pathway of boronate esters formation under aqueous conditions remains controversial. We report a MALDI-MS approach to investigate the interactions between phenylboronic acid and monosaccharides in neutral aqueous solution by using polylevodopa as an innovative substrate instead of conventional matrix. A series of unusual tri-benzeneboronic esters were then revealed. The mass spectrometry data indicate that they bear a dibenzenepyroboronate cyclic ester moiety with seven-membered ring or eight-membered ring. With the aid of theoretical computations, their most likely geometrical structures are elucidated, and these tri-benzeneboronic esters are proposed to be formed via a boroxine binding monosaccharide pathway. This work provides more insight into the mechanism of boronate affinity interaction between boronic acid and sugars and proves the developed MALDI-MS approach is promising for studying interactions between small molecules. Graphical Abstract
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危险品化学品经营许可证（带存储）