JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21052-21064
·
IF 2.478
Li Chaohua,Su Shengpei,Wang Bikui,Zhou Jijia
It is of great interest and challenge to simultaneously improve the storage stability and bond strength of one-component addition-cure liquid silicone rubber (OLSR) coating for electronic circuit board. In this work, we proposed an efficient approach to address this issue by incorporating both cyano-modification platinum catalyst (CN–PT) and urethane-containing poly(hydromethylsiloxane) (N-PHMS) into OLSR coating using a mechanical mixer. The CN–PT and N-PHMS were synthesized through thermal polymerization reaction and hydrosilylation reaction, respectively. The OLSR coating containing 0.3 phr CN–PT and 3 phr N-PHMS showed the best properties, with a tensile bond strength of 1.63 MPa, a storage period > 180 d at 25 °C, and a curing rate < 2 h at 80 °C. The salt-spray resistance and continuous power-on performance of OLSR coating were also improved, compared with pure OLSR coating. The synergism of CN–Pt and N-PHMS on the enhancement of both the storage stability and bond strength of OLSR coating was also explored. Our findings exhibited great potentials for fabricating OLSR coating with excellent long-term stable service performance including high storage stability and protective ability.
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高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1087-1093
·
IF 8.897
Li Leigang,Wang Pengtang,Cheng Zifang,Shao Qi,Huang Xiaoqing
The sluggish reaction kinetics of oxygen evolution reaction (OER) has largely lowered the efficiency of electrochemical water splitting. Ir represents one of the state-of-the-art electrocatalysts for promoting OER especially in acidic electrolytes. However, it remains a formidable challenge to synthesize high-quality one-dimensional (1D) Ir-based nanostructures for improved electrocatalytic performance. Herein, a template-assisted synthesis method is reported wherein 1D porous Ir-Te nanowires (Ir-Te NWs) are synthesized with Te NWs serving as the template. The Ir-Te NWs exhibit highly enhanced OER performance compared to commercial IrO 2 and Ir/C. In detail, the overpotentials to reach 10 mA·cm −2 are 248 and 284 mV in 1 M KOH and 0.5 M H 2 SO 4 , respectively, much lower than those of commercial catalysts. The Ir-Te NWs also show smaller Tafel slopes than commercial IrO 2 and Ir/C, signifying faster reaction kinetics. Besides, much more durable OER activity can be maintained for Ir-Te NWs with negligible decay during 25 and 20 h stability tests in 1 M KOH and 0.5 M H 2 SO 4 , respectively. Further analysis indicates that the significantly improved OER performance of Ir-Te NWs could be ascribed to the larger electrochemical surface area and smaller electrical resistance. More significantly, the templated synthesis of Ir-Te NWs can be facilely extended to the fabrication of other metal-Te NWs including Ru-Te, Rh-Te and Pt-Te NWs. The design and synthesis of 1D metal-based NWs in this work provide important inspiration for the synthesis of diversified 1D metallic nanostructures with distinctly enhanced catalytic performance and beyond.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 10
·4173-4192
·
IF 2.914
Fu Fengping,He Qian,Zhao Shizheng,Zhu Ting,Liao Fang
The design and fabricate new metal-free photocatalysts is one of the topics in current chemistry. In this paper, we demonstrate the ultrahigh photocatalytic performance of visible light-driven metal-free photocatalyst for selective catalytic reduction of nitro-compounds. The synthesis of 1.5–4.5-nm m-phenylenediamine-Rhodamine B copolymer dots (PmRDs) via simple hydrothermal reaction of Rhodamine B and m-phenylenediamine mixed solution. The obtained PmRDs can be used as visible light-driven metal-free photocatalyst with ultrahigh photocatalytic performance for elective catalytic reduction of nitro-compounds. Due to the hydrogen-bond and specific C–N–N bonding model between the m-phenylenediamine-Rhodamine B copolymer dots (PmRDs) and nitro-compounds, the PmRDs show high photocatalytic activity and selectivity for catalytic reduction of nitro-compounds. Under the irradiation of xenon lamp, 40 ml of 1 mM 4-nitrophenol (4-PN) could be catalyzed by 12 mg catalyst within 5 min, by calculating the rate constants up to 0.766 min −1 (25 °C). In the same way, the PmRDs are also excellent photocatalytic activity and selectivity for different nitro-compounds. Meanwhile, the efficient fast photoinduced electron transfer between the m-phenylenediamine and the Rhodamine B progress significantly improved the photocatalytic performance of PmRDs which is much higher than metal-based (such as: Ag, Ni and Cu) or metallic composite photocatalysts.
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高影响因子
Light-Science & Applications
·
2021
·Vol. 10
·期 1
·1-9
·
IF 17.782
Chen Baiyi,Zhang Rongrong,Hou Yaqi,Zhang Jian,Chen Shiyan,Han Yuhang,Chen Xinyu,Hou Xu
Safe and precise control of gas flow is one of the key factors to many physical and chemical processes, such as degassing, natural gas transportation, and gas sensor. In practical application, it is essential for the gas-involved physicochemical process to keep everything under control and safe, which significantly relies on the controllability, safety, and stability of their valves. Here we show a light-responsive and corrosion-resistant gas valve with non-thermal effective liquid-gating positional flow control under a constant pressure by incorporating dynamic gating liquid with light responsiveness of solid porous substrate. Our experimental and theoretical analysis reveal that the photoisomerization of azobenzene-based molecular photoswitches on the porous substrate enabled the gas valve to possess a light-responsive and reversible variation of substantial critical pressure of non-thermal effective gas flow switch. Moreover, the chemically inert gating liquid prevented the solid substrate from corrosion and, by combining with the high spatiotemporal resolution of light, the gas valve realizes a precisely positional open and close under a steady-state pressure. The application demonstrations in our results show the potentials of the new gas valve for bringing opportunities to many applications, such as gas-involved reaction control in microfluidics, soft actuators, and beyond.
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·1102-1112
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IF 5.693
Zhang Xiaodong,Dong Jingwen,Pan Duo,Yang Gui,Su Fengmei,Ji Youxin,Liu Chuntai,Shen Changyu
A major issue limiting the thermal conductivity (TC) of polymer-based composites is the inevitable vacancy among thermal conductive fillers; the fabrication of continuous thermal conductivity network is significant. In this work, we successfully constructed interpenetrating carbon nanotube (CNT) @carbonized polyvinyl alcohol (αPVA) network in polyimide (PI)/boron nitride nanosheets (BNNS) membranes through co-electrostatic spinning of polyamide acid (PAA)/BNNS precursor fibers and PVA/CNT precursor fibers and subsequent high-temperature treatment. The CNT @αPVA network works as a continuous thermal conductivity network in the membrane, which could also bridge BNNS to remove the vacancies among BNNS fillers. Due to the formation of dual thermal conductive networks, the TC of PI/BNNS with 30 wt% BNNS reached an increasement of 100% with the addition of only 0.3 wt% CNT. In addition, the composites present electrical insulating properties with volume resistivity of about 10 15 Ω·cm, as well as excellent flexibility, pretty good acid–alkali tolerance, and self-extinguishing. This work provides an effective way to develop continuous thermal conductive networks in polymer-based composites for scalable thermal management applications in microelectronics devices. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21297-21307
·
IF 2.478
Cao Yong,Luo Penghui,Xu Yang,Zhang Cong,Tian Chang,You Yuanqi,Tian Meiling,Wang Liqiong,Zhou Shenggang
In this paper, a hydrothermal synthesis method synthesized a foamed nickel (NF)-supported Ag-doped Ag 2 S@MoS 2 hydrogen evolution catalyst. Silver doping can improve the conductivity of MoS 2 , thereby improving the hydrogen evolution activity of MoS 2 . Compared with a single MoS 2 , the Ag 2 S@MoS 2 electrode has a larger specific surface area and has many highly catalytic S edges. In 1 M KOH, the overpotential of Ag 2 S@Ag 0.33 MoS 2 /NF electrode at 10 mA cm −2 is approximately 188 mV. Comparing with the overpotential of NF (391 mV) and MoS 2 /NF (290 mV), it is much lower. Further changing the amount of silver added, the overpotential of Ag 2 S@Ag 0.5 MoS 2 /NF is further reduced to 165 mV at a current density of 10 mA cm −2 . When the voltage is 0.35 V, the current densities of Ag 2 S@Ag 0.33 MoS 2 /NF (42.45 mA cm −2 ) and Ag 2 S@Ag 0.5 MoS 2 /NF (55.5 mA cm −2 ) are higher than those of NF (4.91 mA cm −2 ) and MoS 2 /NF (20.51 mA cm −2 ).
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 29
·16570-16581
·
IF 4.22
Lin Xianxian,Jia Shifang,Liu Jingyi,Li Xiaoke,Guo Xi,Sun Weisheng
The applications of composite phase change materials were limited due to their poor energy utilization efficiency, low thermal conductivity and strong rigidity. In this work, thermally induced flexible wood based on phase change material was fabricated by impregnating delignified wood (DW) with graphene and a novel kind of hyperbranched polyurethane. The wood composite showed excellent softness and flexibility during the heating process of hyperbranched polyurethane. It also displayed suitable phase change temperature (28.1 °C and 36.3 °C) and acceptable latent heat (64.29 J/g and 70.26 J/g) for daily applications. Thermal conductivity of the composite reached 0.417 (W*m −1 K −1 ) after adding graphene, which was enhanced approximately by 414% compared with pure wood. The light harvest efficiency of the composite was also improved after the addition of graphene. Therefore, the thermally induced flexible wood based on phase change material has great potential for building energy conservation and wearable energy storage devices due to its excellent flexibility, high thermal energy storage capacity and outstanding temperature regulating performance.
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高影响因子
Biomass Conversion and Biorefinery
·
2021
·Vol. 12
·期 1
·87-93
·
IF 4.987
Wang Yun,Yao Qiao-Xia,He Jia-Rui,Liang Zhi-Hui,Li Xiang,Cheng Hong,Li Li-Ling
Knoevenagel condensation of acetylacetone and aromatic aldehyde catalyzed by L-proline in the choline chloride-based deep eutectic solvents was achieved. High yields are up to 96.6%. Mild reaction conditions, enhanced rates, improved yields, recyclability of deep eutectic solvents containing L-proline, and reagents’ reactivity which is different from that in standard organic solvents are the remarkable features observed in deep eutectic solvents. The deep eutectic solvents containing catalyst was recycled in four subsequent runs with no decrease in activity.
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高影响因子
Science China-Life Sciences
·
2021
·Vol. 65
·期 3
·561-571
·
IF 6.038
He Meng,Lin Jie,Akakuru Ozioma Udochukwu,Xu Xiawei,Li Yanying,Cao Yi,Xu Yanping,Wu Aiguo
The detection of circulating tumor cells (CTCs) is a crucial tool for early cancer diagnosis, prognosis, and postoperative evaluation. However, detection sensitivity remains a major challenge because CTCs are extremely rare in peripheral blood. To effectively detect CTCs, octahedral Ag 2 O nanoparticles (NPs) with high dispersibility, good biocompatibility, remarkable surface-enhanced Raman scattering (SERS) enhancement, and obvious enhancement selectivity are designed as an SERS platform. Ag 2 O NPs with many oxygen vacancy defects are successfully synthesized, which exhibit an ultra-high SERS enhancement factor (1.98×10 6 ) for 4-mercaptopyridine molecules. The remarkable SERS activity of octahedral Ag 2 O NPs is derived from the synergistic effect of the surface defect-promoted photo-induced charge transfer (PICT) process and strong vibration coupling resonance in the Ag 2 O-molecule SERS complex, greatly amplifying the molecular Raman scattering cross-section. The promoted PICT process is confirmed using ultraviolet-visible (UV-Vis) absorption spectroscopy, demonstrating that obvious PICT resonance occurs in Ag 2 O SERS system under visible light. An additional growth step of SERS bioprobe is proposed by modifying the Raman signal molecules and functional biological molecules on Ag 2 O NPs for CTC detection. The Ag 2 O-based SERS bioprobe exhibits excellent detection specificity for different cancer cells in rabbit blood. Importantly, the high-sensitivity Ag 2 O-based SERS bioprobe satisfies the requirement for rare CTC detection in the peripheral blood of cancer patients, and the detection limit can reach 1 cell per mL. To our knowledge, this study is the first time that a semiconductor SERS substrate has been successfully utilized in CTC detection. This work provides new insights into CTC detection and the development of novel semiconductor-based SERS platforms for cancer diagnosis.
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高影响因子
NPG Asia Materials
·
2021
·Vol. 13
·期 1
·1-10
·
IF 10.481
Sun Yue,Wu Yadong,Hu Yuhao,Zhu Congcong,Guo Hao,Kong Xiang-Yu,Luo Ercang,Jiang Lei,Wen Liping
Osmotic energy, existing between solutions with different concentrations, is a sustainable and ecofriendly resource for solving energy issues. However, current membrane-based osmotic energy conversion technologies focus on electricity generation from an “open” system by directly mixing salt (NaCl) solutions at room temperature. For the integrated utilization of thermal energy and higher power output performance, we demonstrate thermoenhanced osmotic energy conversion by employing highly soluble lithium bromide (LiBr) solutions, asymmetric sulfonated poly(ether ether ketone)/poly(ether sulfone) (SPEEK/PES) membranes, and LiMn 2 O 4 /carbon nanotube (LMO/CNT) electrodes. The thin top layer of this heat-resistant membrane contains hydrophilic groups (i.e., the sulfonated groups in SPEEK) that are beneficial for ion-selective transport. The thermal effect on each solution is investigated, and osmotic energy conversion can be improved by regulating the heat gradient. The power density is ~16.50 W/m 2 by coupling with a temperature gradient (30 °C). This work is a step forward for promoting the performance of osmotic energy conversion with thermal energy assistance and provides the basis for a closed-loop system with regenerated osmotic energy from other energy forms. Moreover, the external field-osmotic hybrid energy conversion system shows powerful potential in the energy harvesting field.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 8
·1-9
·
IF 5.833
Wang Lina,Zhang Li,Yu Ying,Lin Bixia,Wang Yumin,Guo Manli,Cao Yujuan
A sensitive electrochemical strategy was established for kanamycin determination. A specific aptamer was modified on the electrode as the probe, followed by a cyclic hybridization chain reaction (HCR) with methylene blue, causing an increasing signal response. In the presence of kanamycin, it can initiatively convolve the aptamer and prevent further DNA assembling, resulting in a signal distinction sensitive to the target amount. However, the signal reproducibility is low. To improve the precision, the HCR procedure was investigated. The results demonstrated that the optimal amount of assembled DNA is 12-fold to that of aptamer. This amount was then controlled in further assays. Admittedly, controlled DNA assembling commonly indicates a limited signal amplification. To further enhance the sensitivity, a nanocomposite based on MoS 2 and AuNPs was modified on the electrode. The results of the assay proved that the signal distinction sensitive to target amount increased by 50%. A linearity range is obtained from 0.01 nM to 1.0 μM of kanamycin, and the LOD is 8.4 pM. Subsequently, this strategy was employed to detect kanamycin in chicken liver and milk sample; the recovery results suggest that it possess a satisfactory application prospect in analysis of agricultural products. Graphical abstract
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高影响因子
Advanced Fiber Materials
·
2021
·Vol. 4
·期 1
·108-118
·
IF 0
Li Jianwei,Zhang Xuanning,Lu Yuyan,Linghu Keliang,Wang Chen,Ma Zhonglei,He Xinhai
The separator with excellent mechanical and thermal properties are highly required for lithium ion batteries (LIBs). Therefore, it is crucial to develop novel nanofibrous membranes with enhanced mechanical strength and thermal stability. In this work, the fluorinated polyimide (FPI) was synthesized and blended with polyvinylidene fluoride (PVDF) to fabricate composite nanofibrous membranes (CNMs) via electrospinning method. Benefiting from the introduction of aromatic FPI, the prepared PVDF/FPI nanofibrous membranes were endowed with enhanced mechanical strength and thermal stability. When the FPI content increased from 0 to 30 wt%, the tensile strength of composite nanofibrous membranes enhanced from 1.57 to 2.30 MPa. Moreover, there are almost no dimensional shrinkage for the CNM-30 containing 30 wt% FPI after heat treatment at 160 °C for 1 h. Furthermore, the prepared CNMs show improved electrochemical performances in comparison with neat PVDF and commercial Celgard membranes. The electrolyte uptake and ionic conductivity of the CNMs could reach to 522.4% and 1.14 ms·cm −1 , respectively. The prepared CNMs could provide an innovative and promising approach for the development and design of high-performance separators.
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