查找使用阿拉丁产品的科研文献

Preparation of lignocellulose/graphene composite conductive paper

Wang Ruibin,Bian Huiyang,Ji Hairui,Yang Rendang

Practical production of conductive paper requires the balancing of high electrical conductance, thermal stability and tensile modulus, with cost effectiveness. By utilizing lignocellulose (3.85 ± 0.35% and 17.17 ± 0.62% lignin contents) and graphite as starting materials, a lignocellulose/reduced graphene oxide (LRGO) composite conductive paper is successfully fabricated. The free-standing LRGO paper has a low sheet resistance of 506 ± 34 Ω/sq with a graphene derivative content of ~ 20 wt%. Also high T onset (312 °C) and T 95 (251 °C) are observed, along with a tensile modulus up to 8.36 GPa if ten additional passes of microfluidization are used. Moreover, LRGO paper was used to make active electrodes for a supercapacitor that achieved a specific capacitance of 77.0 F/g. There has been minimal reporting of applying lignocellulose in conductive paper production, so this new method is anticipated to pave the way for developing advanced materials derived from low cost biomass. Graphical abstract

Author Correction: Ocular biometry and refractive outcomes using two swept-source optical coherence tomography-based biometers with segmental or equivalent refractive indices

Omoto Miki Kamikawatoko,Torii Hidemasa,Masui Sachiko,Ayaki Masahiko,Tsubota Kazuo,Negishi Kazuno

Studies on micron-sized Na0.7MnO2.05 with excellent cycling performance as a cathode material for aqueous rechargeable sodium-ion batteries

Gu Fanpei,Yao Xiaolin,Sun Tianjiao,Fang Minhua,Shui Miao,Shu Jie,Ren Yuanlong

Aqueous rechargeable sodium-ion batteries (ARSB) have great potential as large-scale storage devices owing to their low cost, high energy density, safety, and environmental friendliness. Here, micron-sized Na 0.7 MnO 2.05 , fabricated by a facile sol–gel method, is reported as a novel cathode material for ARSB and has been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), selected area electron diffraction/energy dispersive spectroscopy (ED/EDS) and X-ray photoelectron spectroscopy (XPS). As revealed, the material is perfectly synthesized. The Na 0.7 MnO 2.05 electrode delivers an initial charge specific capacity of 42.6 mA h g −1 at a current density of 50 mA g −1 . Compared with the capacity of 100th cycle (the highest discharge specific capacity of 52 mA h g −1 ), a capacity retention of 90.1% after 600 cycles is still observed. Good rate performance and excellent long-term cycling capability are also demonstrated. Unique morphology, medium-sized and mono-disperse particles facilitate the diffusion of Na + in the electrode, which is also beneficial for Na 0.7 MnO 2.05 electrode to exhibit excellent electrochemical performance.

Structure and microwave dielectric properties of the Li2O–MgO–TiO2 systems

Li Chang,Fu Zhifen,Chen Chen,Cheng Qing

In this paper, Li 2 O–MgO–TiO 2 (1: x :1, x  = 1, 2, 3, 4 and 5) ceramic systems were prepared by solid-state reaction sintering. The effects of extra magnesium content on the phase evolution, crystal structure and microwave dielectric characteristics of Li 2 O–MgO–TiO 2 ceramics were systematically investigated. The Li 2 MgTi 3 O 8 , Li 2 Mg 3 TiO 6 , and (Li 2 TiO 3 ) 10.667 coexisted at x  = 1 and 2. When x augmented to 3, the pure Li 2 Mg 3 TiO 6 -like phase was obtained with the increase of magnesium content. All specimens showed porous structure and clear grain boundaries. The microwave dielectric characteristics are extraordinary dependent on chemical component and densification. The Li 2 O–4MgO–TiO 2 ceramics sintered at 1350 °C possessed preeminent comprehensive performance of ε r  = 13.95, Q  ×  f  = 119,072 GHz and τ f   = − 40.9 ppm/°C.

Synthesis of Li4Ti5O12/V2O5 nanocomposites for lithium‐ion batteries by one‐pot co‐precipitation method

Liu Zhenjie,Huang Yudai,Wang Xingchao,Zhang Yue,Ding Juan,Guo Yong

Li 4 Ti 5 O 12 /V 2 O 5 nanocomposites were synthesized by one-pot co-precipitation method. The structure and morphology of the as-prepared materials were analyzed by X-ray diffraction and transmission electron microscopy. The results show that Li 4 Ti 5 O 12 /V 2 O 5 composites with different nano size were successfully synthesized. The Li 4 Ti 5 O 12 /V 2 O 5 sample (2 wt% V 2 O 5 addition of Li 4 Ti 5 O 12 ) keep at a high discharge capacity of 169.9 mAh g − 1 after 150 cycles at 1 C. The existence of the V 2 O 5 reduces the size of Li 4 Ti 5 O 12 , which improve the electrochemical activity of the sample.

Reversible control of the magnetization of spinel ferrites based electrodes by lithium-ion migration

Wei Guodong,Wei Lin,Wang Dong,Chen Yanxue,Tian Yufeng,Yan Shishen,Mei Liangmo,Jiao Jun

Lithium-ion (Li-ion) batteries based on spinel transition-metal oxide electrodes have exhibited excellent electrochemical performance. The reversible intercalation/deintercalation of Li-ions in spinel materials enables not only energy storage but also nondestructive control of the electrodes’ physical properties. This feature will benefit the fabrication of novel Li-ion controlled electronic devices. In this work, reversible control of ferromagnetism was realized by the guided motion of Li-ions in MnFe 2 O 4 and γ-Fe 2 O 3 utilizing miniature lithium-battery devices. The in-situ characterization of magnetization during the Li-ion intercalation/deintercalation process was conducted, and a reversible variation of saturation magnetization over 10% was observed in both these materials. The experimental conditions and material parameters for the control of the ferromagnetism are investigated, and the mechanism related to the magnetic ions’ migration and the exchange coupling evolution during this process was proposed. The different valence states of tetrahedral metal ions were suggested to be responsible for the different performance of these two spinel materials.

Embedding Noble-Metal-Free Ni2P Cocatalyst on g-C3N4 for Enhanced Photocatalytic H2 Evolution in Water Under Visible Light

Ge Jianhua,Jiang Daochuan,Zhang Lei,Du Pingwu

Photocatalytic hydrogen evolution is considered as one of the promising pathways to settle the energy crises and environmental issues by utilizing solar energy. In this paper, noble-metal-free Ni 2 P was used as cocatalyst to enhance g-C 3 N 4 for photocatalytic hydrogen production under visible light irradiation (λ > 420 nm). Characterization results indicated that Ni 2 P nanoparticles were successfully loaded onto g-C 3 N 4 , which can significantly contribute to accelerate the separation and transfer of photogenerated electron. The hydrogen evolution rate reached ∼ 270 µmol h −1  g −1 and the apparent quantum yield (AQY) was ∼ 2.85% at 420 nm. Meanwhile, there is no obviously decrease of the hydrogen production rate even after 36 h under visible light illumination. In addition, the mechanism of photocatalytic hydrogen evolution was also elaborated in detail. Graphical

Loss and Recovery of Nano-MoS2 Lubricity in Carbon Soot Contaminated Polyalphaolefin

Miao Yan,Zhong Chonglong,Li Zhixiang,Xu Yong,Hu Enzhu,Hu Kunhong

Carbon soot (CS) is a contaminant of engine oil, and the interaction between CS and oil additives should be understood. This work investigated the interaction between CS and nano-MoS 2 . Results show that adding 0.5% nano-MoS 2 in polyalphaolefin significantly improved the lubricity. However, the lubricity of nano-MoS 2 unexpectedly disappeared after adding 0.5% CS because CS prevented nano-MoS 2 from forming a tribofilm. Interestingly, the lubricity was mostly recovered by ZDDP, which removed the inhibition of CS by helping form a MoS 2 -contained tribofilm. Another method was also found to remove the inhibition without the help of ZDDP, that is, replacing nano-MoS 2 with nano-MoS 2 /nano-TiO 2 heterostructures. Nano-TiO 2 was immune to soot and could carry nano-MoS 2 into the friction interface by their heterojunction to synergistically form a tribofilm. Graphical abstract

Fast hydrogen purification through graphitic carbon nitride nanosheet membranes

Zhou Yisa,Wu Ying,Wu Haoyu,Xue Jian,Ding Li,Wang Rui,Wang Haihui

Two-dimensional graphitic carbon nitride (g-C 3 N 4 ) nanosheets are ideal candidates for membranes because of their intrinsic in-plane nanopores. However, non-selective defects formed by traditional top-down preparation and the unfavorable re-stacking hinder the application of these nanosheets in gas separation. Herein, we report lamellar g-C 3 N 4 nanosheets as gas separation membranes with a disordered layer-stacking structure based on high quality g-C 3 N 4 nanosheets through bottom-up synthesis. Thanks to fast and highly selective transport through the high-density sieving channels and the interlayer paths, the membranes, superior to state-of-the-art ones, exhibit high H 2 permeance of 1.3 × 10 −6  mol m −2  s −1  Pa −1 with excellent selectivity for multiple gas mixtures. Notably, these membranes show excellent stability under harsh practice-relevant environments, such as temperature swings, wet atmosphere and long-term operation of more than 200 days. Therefore, such lamellar membranes with high quality g-C 3 N 4 nanosheets hold great promise for gas separation applications.

Andrographolide Improves ApoE4-Mediated Blood–Brain Barrier Injury by Alleviating Inflammation

Zhou Xuebin,Li Jinhua,Quan Shengli,Zhang Xinyue,Gu Lili,Hu Min,Huang Wenhai,Li Qin

The pathological and physiological studies of Alzheimer’s disease (AD) have been in-depth, and apolipoprotein E4 (ApoE4) has been proven to be highly correlated with AD, and clinical and experimental data show that ApoE4 can cause blood–brain barrier (BBB) injury, and the change of BBB permeability is an important factor affecting the development of AD. Andrographolide (Andro), as the active component of the natural plant Andrographis paniculata , has been proven to have anti-inflammatory and antioxidant effects, which have potential neuroprotective effects. To verify the protective effect of Andro on BBB in a short term, our research group used atorvastatin (Atorva)-mediated zebrafish brain injury model and the ApoE4-mediated cell co-culture model of BBB injury to explore the protective effects and mechanisms of Andro on BBB injury. Studies have shown that Andro can inhibit the activation of CypA/NF-κB/MMP-9 signaling pathway and has achieved the effect of antagonizing the inhibition of ApoE4 on intercellular tight junction proteins (occludin, claudin-5, and ZO-1). At the same time, Andro can inhibit the secretion of cell adhesion molecules (VCAM-1 and ICAM-1) in cells, thereby delaying the occurrence and progression of neuroinflammation and playing a protective role in BBB. In conclusion, Andro is a potent natural product which can protect the blood–brain barrier.

Exploring the Relationships Between Exposure Levels of Per- and Polyfluoroalkyl Substances and Prostate Cancer Occurrence in Southwest China

Guo Jiaqi,Hu Zifan,Sun Weiyang,Li Jia,Huang Xinyi,Zhou Xianghong,Zhang Zilong,Jin Yuming,Huang Weichao,Luo Chunying,Harada Koji,Qiu Shi,Zou Xiaoli

Per- and polyfluoroalkyl substances (PFAS), as endocrine disruptors, may increase the risk of prostate cancer by interfering with the endocrine system, however, current population-based evidence is still limited, and there are relative few types of PFAS involved. This study aims to investigate the association between exposure to 18 kinds of PFAS and the incidence of prostate cancer in southwest China. In the case–control study, plasma samples from 97 PCa patients and 111 controls without a family history were analyzed using UPLC-MS/MS. The association between PFAS concentrations and prostate cancer was analyzed using Mann–Whitney U tests and Bayesian logistic regression. The detection limits of the proposed UPLC-MS/MS method ranged from 0.00070 to 0.30 ng/mL. The detection rate of most PFAS is greater than 75%, except for Perfluorodecanesulfonic acid (PFDS), Perfluorohexanoic acid (PFHxA), Perfluorohexadecanoic acid (PFHxDA), Perfluorooctadecanoic acid (PFODA), Perfluoropentanoic acid (PFPeA), Perfluorotetradecanoic acid (PFTeDA). Mann–Whitney U test results showed that differences in Perfluorobutanoic acid (PFBA), Perfluorohexanesulfonic acid (PFHxS), Perfluoroheptanesulfonic acid (PFHpS), Perfluorooctanesulfonic acid (PFOS), and Perfluoroundecanoic acid (PFUnDA) between the two groups were statistically significant, suggesting that exposure to these compounds may be associated with prostate cancer occurrence. Bayesian analysis showed no significant correlation for several PFAS, but Perfluorooctanoic acid (PFOA) [OR 2 ≥4.02  = 2.86, 95% CI 2 (1.64, 6.28)], Perfluorononanoic acid (PFNA) [OR 2 ≥1.61  = 3.82, 95% CI 2 (1.22, 16.08)], and PFUnDA [OR 2 ≥0.462  = 7.14, 95% CI 2 (1.12, 68.7)] demonstrated a positive correlation in high-concentration groups. Conversely, PFOS showed a negative correlation after adjustment [OR 2 ≥3.71  = 0.97, 95% CI 2 (0.87, 0.99)]. These results suggest a potential link between PFAS exposure and prostate cancer in the Chinese population, warranting further research.

PEG-conjugated triacontanol micelles as docetaxel delivery systems for enhanced anti-cancer efficacy

Lu Xiaoyu,Fang Min,Yang Yue,Dai Yu,Xu Jiaqiu,Zhao Di,Lu Yang,Chen Xijing,Lu Shan,Li Ning

PEGylated triacontanol (mPEG 2k -b-TRIA) was developed as a dual-functional polymer with remarkable biocompatibility. The polymer could self-assemble to micelles with critical micelle concentration (CMC) 17.62 μg mL −1 . Docetaxel-loaded mPEG 2k -b-TRIA micelles (DTX PMs) were fabricated to evaluate the feasibility of mPEG 2k -b-TRIA as drug delivery system. DTX PMs achieved desirable particle size of 93.7 nm, drug loading of 6.66%, and drug encapsulation efficiency of 89.87%. The drug release was based on first-order kinetics model, thus enabling prolonged release. Meanwhile, pharmacokinetic study also revealed that DTX PMs could improve the exposure level of DTX and prolong its systemic circulation time. Furthermore, DTX PMs demonstrated significantly enhanced cytotoxicity and cellular uptake in vitro compared with DTX solution. The in vivo tumor inhibition study carried out on MCF-7 bearing BALB/c mice model also validated that DTX PMs exhibited stronger anti-tumor activity but low toxicity. Notably, mPEG 2k -b-TRIA made some contribution to inhibit the growth of breast cancer cells in vitro and in vivo, indicating the potential as anti-tumor complementary agents. All the results suggested that mPEG 2k -b-TRIA polymer as a vehicle in the formulation of anti-cancer drugs may provide an effective way to improve their therapeutic efficacy. Consequently, the mPEG 2k -b-TRIA polymers would be another promising carrier for hydrophobic anti-cancer drugs delivery.