查找使用阿拉丁产品的科研文献

Discovery of Mechanoluminescence in an Antimony-Based Organic–Inorganic Hybrid Metal Halide

Wei Zhou,Gangyi Zhang,Xiaohang Niu,Yun Zhang,Weifeng Chen,Zuobin Tang,Hua Lu

Metal halides have garnered significant attention owing to their tunable emission characteristics and exceptional optoelectronic properties. Despite thorough investigation into their electroluminescence (EL) and photoluminescence (PL) properties, the mechanoluminescence (ML) behavior of these materials, which is pivotal for applications like stress-sensitive sensors and anti-counterfeiting, is overlooked. This issue is tackled by reporting the discovery of efficient ML in antimony-based hybrid metal halides, MTP 2 SbCl 5 , utilizing a unique molecular design that integrates inorganic luminescent centers within an organic conjugated cationic matrix. This structure promotes spatial isolation of luminescent sites, reducing non-radiative decay and enhancing emission efficiency to 100%. Furthermore, in this structure, the disruption of strong intermolecular forces induces charge rearrangement and the establishment of an electrostatic field, which constitutes the primary mechanism underlying the formation of ML. To demonstrate practicality, MTP 2 SbCl 5 /PDMS elastomers are engineered, which showcase exceptional performance in dynamic pressure mapping and information encryption. This research not only broadens the utility of metal halides but also paves the way for a versatile approach to crafting ML materials for advanced optoelectronics.

Palladium supported on an ion exchange resin for the Suzuki-Miyaura reaction

Mingming Zhang,Manman Jiang,Changhai Liang

A basic anion exchange resin , Amberlite IRA-900, was loaded with Pd(C 3 H 5 )(C 5 H 5 ) by an easy metal-organic chemical vapor deposition (MOCVD) approach to give Pd@IRA-900 catalyst after reduction at room temperature . Ultraviolet-Visible spectroscopy results showed a red shift of the absorption peak of Pd 2+ after the Pd precursor was loaded on the resin, indicating that a chemical reaction occurred between the precursor and the support. Pd nanoparticles with 2.6 nm of average size were well dispersed on the support. The Pd@IRA-900 catalyst showed high activity for different kinds of aryl halides in Suzuki-Miyaura coupling reactions under mild and aerobic conditions. Excellent recyclability of Pd@IRA-900 catalyst was also observed in the Suzuki-Miyaura coupling reaction of iodobenzene and phenylboronic acid . A bifunctional catalyst Pd@IRA-900(OH) was synthesized by pretreating the ion exchange resin support with NaOH before Pd loading, which successfully catalyzed the Suzuki-Miyaura reaction of iodobenzene and phenylboronic acid without base under aerobic conditions.

Notoginsenoside as an environmentally friendly shale inhibitor in water-based drilling fluid

Jin-Sheng Sun,Zong-Lun Wang,Jing-Ping Liu,Kai-He Lv,Fan Zhang,Zi-Hua Shao,Xiao-Dong Dong,Zhi-Wen Dai,Xian-Fa Zhang

The demand for non-toxic and biodegradable shale inhibitors is growing in the drilling industry. In this paper, the effect of notoginsenoside (NS) as a new, environmentally friendly inhibitor of shale hydration is systematically studied for the first time. The inhibition performance of NS was evaluated via inhibition evaluation tests, including mud ball immersion tests, linear expansion tests, shale rolling recovery tests, and compressive strength tests. The inhibition mechanism of NS was analyzed using Fourier transform infrared spectroscopy (FTIR), contact angle measurements, particle size distribution determination, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The experimental results demonstrate that NS is able to adhere to the clay surface, forming a hydrophobic film that prevents the entry of water molecules and inhibiting the hydration dispersion of the clay. Because of this, NS can maintain the original state of bentonite pellets in water, which can effectively reduce the swelling rate of bentonite, increase the recovery rate of shale drill cuttings, maintain the strength of the shale, and therefore maintain the stability of the borehole wall during drilling. In addition, NS is non-toxic, degradable, and compatible with water-based drilling fluids. The above advantages make NS a promising candidate for use as an environmentally friendly shale inhibitor.

Kinetics of an SN1 reaction in triethylamine + D2O near the consolute point

Jinshou Wang,Yan Chen,Boan Shi,Yan Xie,Yu Cao,Yingxuan Liu,Shenghui Zhang

We have measured the rate of S N 1 hydrolysis reaction of 2-bromo-2-methylpropane in triethylamine   +   D 2 O near and far away from its critical point by electrical conductivity experiment. We report the observation of critical slowing down in the rate of reaction in the one-phase region near the consolute point of triethylamine   +   D 2 O, in contrast to Kim and Baird, J. Phys. Chem. A 107, 8435 (2003), who reported speeding up in the one-phase region of triethylamine   +   H 2 O. Like them, however, we observed slowing down in the rate of reaction in the two-phase region near the consolute point.

Observation of Orbital-Selective Dual Modulations in an Anisotropic Antiferromagnetic Kagome Metal

Renjie Zhang,Bocheng Yu,Hengxin Tan,Yiwei Cheng,Feiran Shen,Junye Yang,Dan Mu,Xinru Han,Alfred Zong,Quanxin Hu,Xuezhi Chen,Yudong Hu,Chengnuo Meng,Junchao Ren,Junqin Li,Zhenhua Chen,Zhengtai Liu,Mao Ye,Makoto Hashimoto,Donghui Lu,Shifeng Jin,Binghai Yan,Lunhua He,Ziqiang Wang,Tian Shang,Yaobo Huang,Baiqing Lv,Hong Ding

In TbTi${}_{3}$Bi${}_{4}$, an orbital-specific response in the antiferromagnetic state reveals a deep connection between orbital behavior and magnetic ordering.

Synthesis of an ionic liquid demulsifier with double hydrophilic and hydrophobic chains

Xuening Feng,Huanyu Liu,Hanjun Liu,Xuebin Jiang,Liwei Shen,Yuqi Tang,Qian Qu,Dong Xiang,Xuemin Yan,Yuanzhu Mi

A new type of ionic liquid demulsifier with double hydrophilic and hydrophobic chains (HDEA-TFA) was synthesized through the quaternization and replacement reaction. The chemical structure of HDEA-TFA was identified by 1 H NMR and FT-IR. It could be applied as an excellent demulsifier for two water-in-crude oil (W/O) emulsions (m water :m oil  = 70:30 and m water :m oil  = 30:70). The effect of demulsification conditions such as concentration of HDEA-TFA, settling time, demulsification temperature, pH value and salinity on the demulsifying efficiency (DE) of the W/O emulsions were discussed in detail. The results showed that the demulsifying efficiency (DE) of HDEA-TFA in the two W/O emulsions could reach 100 % with the concentration of 500 mg/L at 60 °C within 120 min. Also, HDEA-TFA had excellent acidic, alkaline and salt resistance. Moreover, several commercial demulsifiers were compared to evaluate the demulsifying performance of HDEA-TFA. The dynamic interfacial tension (IFT), surface tension (ST), three-phase contact angle (CA), elasticity modulus (EM) and zeta potential were used to investigate the demulsifying mechanism. The current study developed a new type of ionic liquid demulsifier with excellent performance and provided a reference for the research of demulsification mechanism.

Titanium surface-grafted zwitterionic polymers with an anti-polyelectrolyte effect enhances osteogenesis

Bingbing Zhu,Erna Jia,Qimeng Zhang,Yanyan Zhang,Hua Zhou,Ying Tan,Zhennan Deng

Zwitterionic polymers have attracted considerable attention because of their anti-adsorption and unique anti-polyelectrolyte effects and was widely used in surface modification. In this study, zwitterionic copolymers (poly (sulfobetaine methacrylate-co-butyl acrylate) (pSB) coating on the surface of a hydroxylated titanium sheet using surface-initiated atom transfer radical polymerization (SI-ATRP) was successfully constructed. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and Water contact angle (WCA) analysis proved the successful preparation of the coating. The swelling effect caused by the anti-polyelectrolyte effect was reflected in the simulation experiment in vitro, and this coating can promote the proliferation and osteogenesis of MC3T3-E1. Therefore, this study provides a new strategy for designing multifunctional biomaterials for implant surface modifications.

An investigation for H2/N2 adsorptive separation in SIFSIX-2-Cu-i

Hui Zhang,Qiang Fu,Hongyun Qin,Xia Chen,Qicheng Zhang,Zixu Dong,Haoyuan Li,Shoudong Wang,Ming Wang

Hydrogen recovery from ammonia purge gas is a desirable method to relieve the pressure of increasing demand for hydrogen. Metal-organic frameworks (MOFs) are promising adsorbents for the separation of the H 2 –N 2 mixture. However, the separation of the H 2 –N 2 mixture using MOFs remains challenging due to the lack of adsorptive mechanism. Herein, the adsorption mechanism of the H 2 –N 2 mixture in SIFSIX-2-Cu-i has been systematically investigated with the method of a combination of excess adsorption experiments, molecular simulations , and DFT calculations. In the Grand Canonical Monte Carlo (GCMC) simulations, the polarizable force field was first applied to the adsorption of pure H 2 or N 2 and H 2 –N 2 mixture in SIFSIX-2-Cu-i. Ab Initio Molecular Dynamics (AIMD) was performed to investigate the distribution of the guest molecules in the pores of SIFSIX-2-Cu-i. Finally, Density functional theory (DFT) calculations were performed to predict the transfer of charge between MOF and guest molecules. Results revealed two binding sites of H 2 or N 2 in SIFSIX-2-Cu-i. A relatively high thermodynamic adsorption selectivity for N 2 over H 2 has been observed in SIFSIX-2-Cu-i. Furthermore, SIFSIX-2-Cu-i also exhibits a greater affinity with N 2 than with H 2 , which is probably because of the stronger induction interactions between F2 atoms and N 2 molecules. These findings are of significance to guide the design of the new highly selective adsorbents for the separation of H 2 /N 2 .

An underwater stable superhydrophobic surface for robust ultra-long-lasting biofouling resistance

Xinghua Wu,Minghao Xiao,Junting Zhang,Guohuang Tan,Yutong Pan,Yuekun Lai,Zhong Chen

An underwater stable superhydrophobic surface that displays a very low affinity to water and microorganisms is urgently required in marine engineering and offshore constructions. In this study, we demonstrated an underwater stable superhydrophobic surface with pressure resistance, chemical stability, biocompatibility, and biofouling resistance. The surface demonstrated superhydrophobicity under a water pressure of 13.72 kPa for up to 27 days. To examine the anti-biofouling property of the surface, the as-prepared samples were submerged in a natural lake for 50 days. The surface could withstand water flush and biological attacks for more than 35 days. The mechanical stability of the surface was evaluated by a sandpaper scratching test. An abrasion length of 12 m would not decrease the water contact angle of the surface, which is superior over the state-of-the-art coatings based on candle soot networks. The stable long-lasting underwater superhydrophobic surface is of great importance to marine applications.

Wide-Temperature Flexible Supercapacitor from an Organohydrogel Electrolyte and Its Combined Electrode

Yuzhen Qian,Yang Yu,Wenna Wu,Qi Fan,Chunxiao Chai,Jingcheng Hao

Graphical Multipurpose gels : A flexible supercapacitor that integrates a wide application temperature range (−20–80 °C), satisfactory electrochemical performance and mechanical properties has been fabricated by using ionic conductive, anti-freezing and anti-drying organohydrogels both as electrolyte and binder of the combined electrode. Hydrogel-based flexible supercapacitors possess the merits of highly ionic conductivity and superior power density, but the existence of water limits their application in extreme temperature scenarios. Noticeably, it is a challenge for people to design more extremely temperature adaptable systems for flexible supercapacitors based on hydrogels with a wide temperature region. In this work, a wide-temperature flexible supercapacitor that can operate at −20–80 °C was fabricated by an organohydrogel electrolyte and its combined electrode (also known as an electrode/electrolyte composite). Upon introducing highly hydratable LiCl into an ethylene glycol (EG)/H 2 O binary solvent, owing to the ionic hydration effect of LiCl and the hydrogen bond interaction between EG and H 2 O molecules, the organohydrogel electrolyte exhibits satisfactory resistance to freezing (freezing point of −113.9 °C), anti-drying capability (78.2 % of weight retention after vacuum drying at 60 °C for 12 h) and excellent ionic conductivity both at room temperature (13.9 mS cm −1 ) and low temperature (6.5 mS cm −1 after 31 days at −20 °C). By using organohydrogel electrolyte as binder, the prepared electrode/electrolyte composite effectively reduces interface impedance and enhances specific capacitance due to the uninterrupted ion transport channels and extended interface contact area. The assembled supercapacitor delivers a specific capacitance of 149 F g −1 , a power density of 160 W kg −1 , and an energy density of 13.24 Wh kg −1 at a current density of 0.2 A g −1 . The initial 100 % capacitance can be maintained after 2000 cycles at 1.0 A g −1 . More importantly, the specific capacitances can be well maintained even at −20 and 80 °C. With other advantages such as excellent mechanical property, the supercapacitor is an ideal power source suitable for various working conditions.

Surface decoration with leucine tetrapeptide: An antibacterial strategy against Gram-negative bacteria

Dandan Xu,Xiaoyan Ju,Meng Zhu,Jinzhao Ou,Guojun Lu,Chenxiao Wan,Kejia Li,Wei Jiang,Xinyu Jia,Yongping Han,Ye Tian,Zhongwei Niu

Surface-associated microbe contamination by Gram-negative bacteria poses a serious problem in medical care. Cationic peptides or polymers are the main materials used for antibacterial surface coating , but the positive charge may lead to blood coagulation . Therefore, exploiting surface coating which is free of positive charge and is effective for Gram-negative bacteria inactivation is in urgent need. In this study, inspired by the affinity between lipopolysaccharides of Gram-negative bacteria and Toll-like receptors of immune cells, we develop a leucine-based tetrapeptide coating strategy for combating Gram-negative bacteria. The obtained surface has excellent bactericidal activity against Gram-negative bacteria like Pseudomonas aeruginosa and Escherichia coli . A 1 mm 2 coated glass surface could kill > 9.9 × 10 4 CFU bacteria in 1 h and has nearly no damage to mammal cells. Moreover, this surface coating strategy could be applied on various surfaces like glass slices, glass capillary cavity and thermoplastic polyurethane slices. And the coated surface could largely mitigate the microbe contamination in an in vivo subcutaneous implantation. This work paves a new way for antibacterial surface-coating which is behaving no positive charge and is of great importance for biomedical devices.

An efficient nonviral gene-delivery vector based on hyperbranched cationic glycogen derivatives

Xuan Liang,Xianyue Ren,Zhenzhen Liu,Yingliang Liu,Jue Wang,Jingnan Wang,Li-Ming Zhang,David YB Deng,Daping Quan,Liqun Yang