查找使用阿拉丁产品的科研文献

Noncovalent self-assembled supramolecular aggregate decorated nickel-aluminum layered double hydroxides nanosheets for reinforcing the flame retardancy of PLA

Kunyan Wang,Yuqi Jiang,Changjin Lv,Qianhui Chi,Yuhua Guo,Peisong Tang,Guoxiang Pan,Qipeng Guo

In this work, an environmentally friendly and energy-saving strategy to decorate Ni-Al layered double hydroxides nanosheets (LDHs@PN) has been utilized to boost their flame retardancy and dispersion in the polymer. This proposed strategy was implemented through noncovalent self-assembly supramolecular aggregate of phytic acid (PA) and 1,4-bis(3-aminoethyl) piperazine (AEP) onto NiAl-LDHs surface in water without any organic solvent. The target product LDHs@PN was investigated by different characterization techniques. It was found that LDHs@PN was successfully fabricated possessing hydrophobic surfaces. In contrast, the surface of LDHs@PN became rough and exhibited a fluffy structure. Meanwhile, Ni, Al, P and N were homogeneously distributed on the surface of LDHs@PN. Significantly, after introducing LDHs@PN into biobased polylactic acid (PLA) via melting-blending, the thermal stability of composites was improved compared to that of pure PLA and LDHs@PN promotes the formation of composite residual carbon. In addition, the PLA/LDHs@PN composite with 20 wt% loadings reached V-0 rating in the UL-94 test and achieved 30.1% limiting oxygen index value, indicating LDHs@PN significantly increased the flame retardant performance of the PLA. The flame retardant mechanism of LDHs@PN in the PLA matrix was analyzed. This facile, low-cost and eco-friendly decorating strategy is promising for industrial production.

Nondemanding In Situ Encapsulation Route to Ultrastable Perovskite Nanocrystals for White Light-Emitting Diodes

Chengli Wang,Mengqiang Zhang,Hui Yu,Wenjie Zhang,Ge Shi,Xiaomeng Zhang,Zhe Cui,Peng Fu,Minying Liu,Xiaoguang Qiao,Yanjie He,Xinchang Pang

Although tremendous advancement regarding the highly stable metal halide perovskite nanocrystals (PNCs) has been achieved, previous studies were primarily focused on green light-emitting PNCs (i.e., bromine-based PNCs). The stability of chlorine-based PNCs with a violet or blue emission property was still lagging behind that of their bromine-based counterparts. Herein, a nondemanding and versatile strategy for in situ encapsulating all-inorganic chlorine-based PNCs with multifold exceptionally high stabilities was presented. Well-ordered mesoporous silica enabled the confined growth of PNCs in its pores followed by the porosity sealing by tetramethyl orthosilicate hydrolysis, thereby rendering full encapsulation of chlorine-based PNCs in dense silica that originated from high-temperature calcination. This judiciously designed structure imparted enclosed violet/blue emitting PNCs impart with outstanding long-term stability (>1.5 year) with high photoluminescence quantum yield (i.e., 30.4%) in pure water as the result of complete isolation of PNCs from detrimental stimuli, eventually leading to the application in the white light-emitting diode device.

Quantum Dots Meet Enzymes: Hydrophobicity of Surface Ligands and Size Do Matter

Ying-Qi Yu,Wen-Qi Chen,Xiao-Han Li,Meng Liu,Xiao-Hang He,Yi Liu,Feng-Lei Jiang

Colloidal quantum dots (QDs) are a class of representative fluorescent nanomaterials with tunable, bright, and sharp fluorescent emission, with promising biomedical applications. However, their effects on biological systems are not fully elucidated. In this work, we investigated the interactions between QDs with different surface ligands and different particle sizes and α-chymotrypsin (ChT) from the thermodynamic and kinetic perspectives. Enzymatic activity experiments demonstrated that the catalytic activity of ChT was strongly inhibited by QDs coated with dihydrolipoic acid (DHLA-QDs) with noncompetitive inhibitions, whereas the QDs coated with glutathione (GSH-QDs) had weak effects. Furthermore, kinetics studies showed that different particle sizes of DHLA-QDs all had high suppressive effects on the catalytic activity of ChT. It was found that DHLA-QDs with larger particle sizes had stronger inhibition effects because more ChT molecules were bound onto the surface of QDs. This work highlights the importance of hydrophobic ligands and particle sizes of QDs, which should be considered as the primary influencing factors in the assessment of biosafety. Meanwhile, the results herein can also inspire the design of nano inhibitors.

A photocatalytic carbon monoxide-generating effervescent microneedle patch for improved transdermal chemotherapy

Junzhe Fu,Weijiang Yu,Xuedan Qian,Youxiang Wang,Jian Ji

Carbon monoxide (CO) is regarded as a promising therapeutic agent for chemotherapy sensitization. To simultaneously achieve controllable in situ CO production and efficient chemotherapeutics delivery is of great significance. Here, we presented a polyvinylpyrrolidone (PVP) core–shell microneedle (MN) system that encapsulated the effervescent component, photocatalyst, and doxorubicin hydrochloride (Dox·HCl) for CO-sensitized chemotherapy. Upon the insertion of MNs, the effervescent component, composed of sodium bicarbonate and tartaric acid, was exposed to interstitial fluid, leading to the burst release of carbon dioxide (CO2). The generated gas not only enhanced the diffusion of Dox·HCl but also served as a substrate for the photocatalytic generation of CO. From the experimental results, the photocatalyst CuS atomic layers (CAL) displayed an effective CO2 photoreduction performance, which could realize an irradiation time/intensity-dependent CO-controlled release. Ex vivo permeation studies demonstrated that effervescent CO2 production markedly enhanced the intradermal diffusion of Dox·HCl. Eventually, the robust antitumor efficacy of this versatile MN platform was proved in B16F10-bearing nude mice. This CO-sensitized chemotherapeutic MN system offered a novel strategy for transdermal gas/drug delivery, which might provide a new direction in tumor suppression.

Electrohydrodynamically Printed High-resolution Arrays Based on Stabilized CsPbBr3 Quantum Dot Inks

Xiao Yang,Zi-Jun Yan,Chen-Ming Zhong,Hui Jia,Guo-Long Chen,Xiao-Tong Fan,Shu-Li Wang,Ting-Zhu Wu,Yue Lin,Zhong Chen

High-resolution perovskite quantum dots (PeQDs) arrays printed by electrohydrodynamic (EHD) inkjet printing show great application prospects in fields of micro-display. Commonly, EHD inkjet requires a polar system for printing but it easily quenches the PeQDs. Meanwhile, the mismatch of solvent parameters causes uneven surface morphology and printing instability. In this work, a morphology uniformization strategy of a nonpolar binary solvent system of 1,3,5-triethylbenzene and n-tetradecane is proposed to prepare the didodecyldimethylammonium bromide (DDAB)/PbBr 2 passivated PeQDs inks. When the solvent volume ratio is 5:5, the photoluminescence quantum yield (PLQY) of the ink reaches 94.06%. Benefiting from the match of boiling point, surface tension, and dielectric constant of ink, after the EHD inkjet printing, the line width of continuous smooth line arrays is as narrow as 2.0 µm and the coffee effect of dot arrays is well inhibited. Meanwhile, derived from the strong electrostatic interaction between the π-electron structure of 1,3,5-triethylbenzene and DDA + , the ink exhibits high stability. Moreover, the high-resolution logo and miniature quick responsecode by EHD inkjet printing reach 22 718 dpi, far higher than that of the reported micro-LED. This work paves the way for high-resolution pixel arrays of micro-display.

Nickel-bromide passivation strategy enabled highly efficient blue-emitting CsPbBr3 nanoplates for monochrome LED application

Ji'an Song,Yan Gao,Zhichao Meng,Zelong Jiang,Xiaobing Cao,Qingguang Zeng,Tao Hu

All-inorganic metal halide perovskites have attracted extensively attentions because of superior optoelectronic properties. Presently, tremendous progress is reached in green and red emitting perovskites , while the explorations of blue emitting perovskites are lag behind, and it also faces low emission efficiency and long-term stability issues. In this work, nickel-bromide passivation strategy was proposed to improve optical properties and chemical stability of blue emitting CsPbBr 3 nanoplatelets (NPLs) with strong quantum-confinement effects. As a result of the repaired Br − vacancy on the surface of the NPLs and enhanced structural stability of CsPbBr 3 lattice by Ni 2+ doping, the emission efficiency of the NPLs is increased from 33.2% to 78%, and it can be stored up to 30 days without significant PL loss. Benefiting from the excellent overall performance, a liquid-type monochrome LED device fabricated by using the passivated CsPbBr 3 NPLs as blue color convector exhibits no emission saturation even the driving current reaches as high level as 190 mA. This work paves a new way for fabricating high-quality blue emitting NPLs with extraordinary properties.

Solution-grown ternary quasi-cube AgSbTe2 and its optoelectronic performance for broadband photodetection

Cunxin Li,Kaijia Xu,Lanjun Cheng,Zhichuan Wu,Yinyin Qian

Group I–V–VI2 nanocrystals have been considered as potential candidates in the field of optoelectronics due to their highly tunable semiconductor characteristics. AgSbTe2, one of the emerging group I–V–VI2 nanocrystals with optical phase-change properties, a high light absorption coefficient and wide spectral response, is attractive for eco-friendly photodetector devices. However, a colloidal synthetic route for obtaining highly crystalline AgSbTe2 nanocrystals with low toxicity precursors, which is vital to high-performance solution-processed photodetector devices, is still rare. Herein, we investigate the colloidal synthesis of quasi-cube AgSbTe2 nanocrystals from the reaction of commercially available AgNO3 with Sb(Ph)3 in oleylamine at 190 °C, followed by the injection of a tellurium source, which was prepared by directly dissolving TeO2 in 1-dodecanethiol. Simple AgSbTe2/ITO heterostructure photodetectors were fabricated by a low-temperature colloidal synthetic route in combination with the spin-coating technique, which exhibit good photoresponse in a wide range from 405 to 980 nm with fast response times (0.49 and 0.58 s) and excellent stability. This work suggests that ternary silver-based I–V–VI2 compound nanostructures have great potential for high-performance optoelectronic applications.

PEGylated Manganese–Zinc Ferrite Nanocrystals Combined with Intratumoral Implantation of Micromagnets Enabled Synergetic Prostate Cancer Therapy via Ferroptotic and Immunogenic Cell Death

Hui Wang,Yu Guan,Chun Li,Jia Chen,Shaoyu Yue,Jieying Qian,Bangshun Dai,Changqin Jiang,Chenghao Wen,Longping Wen,Chaozhao Liang,Yunjiao Zhang,Li Zhang

Therapeutic efficacy for prostate cancer is highly restricted by insufficient drug accumulation and the resistance to apoptosis and immunogenic cell death (ICD). Although enhanced permeability and retention (EPR) effect of magnetic nanomaterials could benefit from external magnetic field, it falls off rapidly with increased distance from magnet surface. Considering the deep location of prostate in pelvis, the improvement of EPR effect by external magnetic field is limited. In addition, apoptosis resistance and cGAS-STING pathway inhibition-related immunotherapy resistance are major obstacles to conventional therapy. Herein, the magnetic PEGylated manganese-zinc ferrite nanocrystals (PMZFNs) are designed. Instead of providing external magnet, micromagnets into tumor tissues are intratumorally implanted to actively attract and retain intravenously-injected PMZFNs. As a result, PMZFNs accumulate in prostate cancer with high efficacy, depending on the established internal magnetic field, which subsequently elicit potent ferroptosis and the activation of cGAS-STING pathway. Ferroptosis not only directly suppresses prostate cancer but also triggers burst release of cancer-associated antigens and consequently initiates ICD against prostate cancer, where activated cGAS-STING pathway further amplifies the efficacy of ICD by generating interferon-β. Collectively, the intratumorally implanted micromagnets confer a durable EPR effect of PMZFNs, which eventually achieve the synergetic tumoricidal efficacy with negligible systemic toxicity.

Synthesis of near-infrared zinc-induced manganese-doped Cu-In-Se quantum dots and their photoluminescence mechanism

Pengtao Sheng,Youyang Xie,Shuyu Han,Yanling Li,Weili Li

Manganese ion-doped quantum dots (QDs) with wide band gaps have been widely investigated to modify their electronic, magnetic, and photophysical properties. The research on Mn-doped Cu-In-Se QDs with narrow band gaps has been minimal due to the profound differences in the reaction reactivity of cations. In this work, photoluminescent and magnetic Cu-In-Se QD nanoprobes were designed and synthesized by introducing Zn 2+ ions, which function as an intermediate acid that can regulate metal ion acidity to enhance the doping efficiency of Mn 2+ ions in a facile phosphine-free hot-injection protocol. The emission peaks of Zn-doped Cu-In-Se QDs and MnZn-doped Cu-In-Se QDs exhibit significant composition-dependent shifts. Moreover, incorporating manganese ions confers a paramagnetic character to MnZn-doped Cu-In-Se QDs and provides a quasi-core shell structure with an Mn-rich alloy shell layer, as demonstrated by the micro-structural surface analysis and electron paramagnetic resonance spectroscopy . Analyzing the decay lifetime and quantum yield reveals that this host-dopant coupling involves a preferential energy transfer from the host material to the dopant (Mn 2+ ions), wherein photogenerated electrons nonradiatively transfer to the 4 T 1 level of Mn dopant and then recombine with the Cu x state above the valance band of host QDs. The ability to serve as nanoprobes for the visualization of tumors through fluorescence and magnetic resonance dual-modality imaging makes these ternary MnZn-doped Cu-In-Se QDs strong candidates for practical applications in biology/biomedicine field.

Robust Synthesis of Silver Nanocubes in Oil Phase

Jiahao Pan,Wei Wang,Min Ji,Xing Xing,Zhenda Lu

Although various methods have been developed to synthesize Ag nanocubes, their synthesis in oil phase has received little attention. We report a robust method to synthesize single-crystalline Ag nanocubes with high purity (>95%) and uniform size in oil phase. The evolution of Ag nanoparticles from different reaction times indicates that multiply twinned seeds (MTDs) and single-crystalline seeds were formed together at the early stage of the reaction. With the reaction process, the MTDs were gradually etched by chloride ions and air, and the remaining single-crystalline seeds grew into nanocubes. The effect of synthetic parameters such as temperature, air flow, and the concentration of cupric chloride and AgNO3 precursors on the morphology and size of Ag nanocubes has been systematically investigated, among which temperature plays an important role in controlling the balance between the etching rate and growth rate. Due to the slow ion diffusion rate compared to that in the water or polyol system, oil-phase synthesis provides a wide regulatory window for completely etching the MTDs, ensuring the high purity of single-crystalline Ag nanocubes.

TiN Electrode for High-Performance CsPbBr₃ Perovskite Nanocrystal-Based Photodetectors

Yue Han,Rong Wen,Ting Ji,Wenyan Wang,Linlin Shi,Yuying Hao,Guohui Li,Yanxia Cui

Upconversion nanoparticles-based background-free selective fluorescence sensor developed for immunoassay of fipronil pesticide

Yin Litao,Hu Xuetao,Hao Mengyu,Shi Jiyong,Zou Xiaobo,Dusabe Keza Dominique

In this study, high luminous efficiency, sensitive and specific fluorescent immunosensor was proposed for the detection of fipronil in spinach (cultivar: Spinacia oleracea L.), celery (cultivar: Apium graveolens L.) and pak-choi (cultivar: Brassica Chinensis L.) by employing the fluorescence resonance energy transfer (FRET). The background-free upconversion nanoparticles-antibodies (UCNPs-antibodies) and gold nanoparticles-antigens (AuNPs-antigens) were prepared, respectively. Fipronil competed with the fipronil whole antigens for the fipronil monoclonal antibodies active sites. The results indicated that the correlation between the concentration of fipronil and the fluorescence intensity had a high relevance (R 2  = 0.9987) in the range of 0.01-100.00 ppb. The average recovery was 95.95-137.07%. This method had great application potential in food safety monitoring and can provide a reference for the analysis of other small molecule pesticide residues.