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RSC Advances
Royal Society of Chemistry
RSC Advances

Royal Society of Chemistry

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    Atomic and electronic structures of charge-doping VO2: first-principles calculations

    Chen, LanliCui, YuanyuanLuo, HongjieGao, Yanfeng...
    10页
    查看更多>>摘要：The atomic and electronic structures of charge-doping VO2 are investigated by using first-principles calculations. Hole doping is more conducive to stabilizing the structure of VO2 than electron doping. The controllable phase transition temperature is coupled with changes in atomic and electronic structures. With the increase in hole density, the V-V chains and twisting angle experience a dramatic change, and the band gap (0.69-0 eV) is rapidly reduced due to orbital switching between the dx(2)-y(2) and dz(2)/d(yz) orbitals. However, as the electron density increases, the band gap (0.69-0.502 eV) narrows slightly, while the V-O bond lengths significantly increase. The current results provide up a variable way to tune the VO2 phase transition temperature through charge-doping.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    Synthesis, crystal structure and antiproliferative mechanisms of gallium(iii) complexes with benzoylpyridine thiosemicarbazones

    Qi, JinxuLiu, TaichenZhao, WeiZheng, Xinhua...
    7页
    查看更多>>摘要：We have prepared six thiosemicarbazone ligands and synthesized the corresponding Ga(iii) complexes. The antitumor activity of the ligand increases with its lipophilicity, and the antitumor activity of the Ga(iii) complexes is affected by the ligands. Since C6 has the highest anticancer proliferative activity (0.14 +/- 0.01 mu M) against HepG-2 (Human hepatocarcinoma cell line), we characterized its structure by X-ray single crystal diffraction and explored its antiproliferation mechanism. Anti-tumor mechanism results show that Ga(iii) complex (C6) promoted HepG-2 cell cycle arrest in the G1 phase by regulating the expression of cell cycle-associated proteins (Cdk 2, cyclin A and cyclin E). Ga(iii) complex (C6) promotes apoptosis by consuming intracellular iron, enhancing intracellular reactive oxygen species (ROS), activating caspase-3/9, releasing cytochromes and apoptotic protease activating factor-1 (apaf-1).
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    CuZn2InTe4 quantum dots-a novel nanostructure employing a green synthesis route

    Kuriakose, LibinSimi, N. J.Ison, V. V.
    5页
    查看更多>>摘要：We report the synthesis and characterisation of novel CuZn2InTe4 quantum dots (QDs) suitable for various optoelectronic applications. The nanostructures grown are technologically important due to their Cd and Pb-free composition. The synthesis was maintained "green" by using a phosphine free organometallic procedure utilizing octadecene as the coordinating solvent. The structural properties of the nanocrystals (NCs) were analyzed using high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and X-ray diffraction (XRD). The composition was verified using X-ray photoelectron spectroscopy (XPS), inductive coupled plasma-optical emission spectroscopy (ICP-OES) and energy dispersive X-ray spectroscopy (EDX). The optical studies were performed using UV-VIS-NIR spectroscopy and photoluminescence (PL) spectroscopy and the band gap value obtained was verified using cyclic voltammetry (CV). The nanostructures grown were spherical with a size of about 5 nm possessing appreciable monodispersity.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    Hydrophobic mesoporous silicon dioxide for improving foam stability

    Meng, LihuiLiu, QingwangWang, JigangFan, Zhenzhong...
    7页
    查看更多>>摘要：In this study, mesoporous SiO2 nanoparticles (MSNs) were synthesized via a sol-gel method and modified with (3-chloropropyl) trimethoxysilane to make them hydrophobic (MMSNs). The material was characterized via SEM, TEM, FT-IR, DLS, BET and contact angle measurements. The MMSNs have good foam stability, so that the foam properties of the added particles have been increased by 38.4% in an oil/SDS solution. Simultaneously, it becomes a promising material for foam stabilization in order to enhance the oil recovery because it is bio-compatibile and environment friendly. Also, it provides a novel application-stable foam for mesoporous materials.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    Multiple-responsive supramolecular vesicle based on azobenzene-cyclodextrin host-guest interaction

    Wang, JiaoWang, TingLiu, XiaohuiLu, Yan...
    9页
    查看更多>>摘要：Multiple-responsive supramolecular vesicles have been successfully fabricated by the complexation between beta-cyclodextrin (beta-CD) and a pH/photo dual-responsive amphiphile 4-(4-(hexyloxy)phenylazo)benzoate sodium (HPB) with azobenzene and carboxylate groups. When mixing beta-CD with HPB to reach a host/guest molar ratio of 1 : 1, the azobenzene group of HPB could be spontaneously included by beta-CD molecules. Then, the formed inclusion complexes (HPB@beta-CD) could self-assemble into vesicles, which was driven by the hydrophobic interaction of the alkyl chain of HPB and the hydrogen bonds between neighboring beta-CDs. The reversible assembly/disassembly of the vesicles could be simply regulated under UV or visible light irradiation. The reversible phase transformation between vesicles and microbelts could also be realized by adjusting the pH values of the sample. Adding both competitive guest molecules (1-adamantane carboxylic acid sodium (ADA)) and alpha-amylase would result in the phase transformation from vesicles to micelles. Moreover, the vesicles would be destroyed when beta-CD was continuously added until the ratio of host/guest reached 2 : 1. Such an interesting quintuple-responsive vesicle system reported here not only has potential applications in various fields such as controlled release or drug delivery, but also provides a reference for the design and construction of multiple responsive systems.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    Fluoxetine scaffold to design tandem molecular antioxidants and green catalysts

    Ribaudo, GiovanniBortoli, MarcoOngaro, AlbertoOselladore, Erika...
    11页
    查看更多>>摘要：Fluoxetine finds application in the treatment of depression and mood disorders. This selective serotonin-reuptake inhibitor (SSRI) also contrasts oxidative stress by direct ROS scavenging, modulation of the endogenous antioxidant defense system, and/or enhancement of the serotonin antioxidant capacity. We synthesised some fluoxetine analogues incorporating a selenium nucleus, thus expanding its antioxidant potential by enabling a hydroperoxides-inactivating, glutathione peroxidase (GPx)-like activity. Radical scavenging and peroxidatic activity were combined in a water-soluble, drug-like, tandem antioxidant molecule. Selenofluoxetine derivatives were reacted with H2O2 in water, and the mechanistic details of the reaction were unravelled combining nuclear magnetic resonance (NMR), electrospray ionisation-mass spectrometry (ESI-MS) and quantum chemistry calculations. The observed oxidation-elimination process led to the formation of seleninic acid and cinnamylamine in a trans-selective manner. This mechanism is likely to be extended to other substrates for the preparation of unsaturated cinnamylamines.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    Assembly of lignin-based colloidal particles: effects of cationic surfactants, molecular weight, and solvent on morphology

    Liu, DexiangLiu, JinyuZhou, YingxiangChen, Jienan...
    7页
    查看更多>>摘要：Sodium lignosulfonate (LS) is a lignin derivative, which has abundant resources and is an environmentally friendly raw material. In this study, cetyltrimethylammonium bromide (CTAB) and stearyltrimethylammonium bromide (STAB) were combined with LS at the isoelectric point for hydrophobic self-assembly. Transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, and static contact angle data proved that LS/CTAB could form colloidal spheres, while LS/STAB could not form such spheres. The impact of the molecular weight of LS on the self-assembly of LS/CTAB was investigated by using the TEM, FTIR, and static contact angle data. The obtained results showed that LS/CTAB with 10 000-50 000 Da of LS could form colloidal spheres, while LS/CTAB with 3000-5000 Da of LS could not. In addition, the TEM images revealed that the solvent plays an important role in the morphology of LS/CTAB colloidal spheres. Finally, LS/CTAB colloidal spheres were used for the encapsulation of ibuprofen (IBU). The in vitro release behavior of IBU was proven to be pH-sensitive and exhibited controlled release properties. More than 85% IBU could be preserved in simulated gastric fluid, and over 75% could be released in simulated intestinal fluid. This work provides a theoretical basis for the preparation of LS/CTAB colloidal spheres and facilitates the expansion of its applications as a drug carrier.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    A signal-enhanced and sensitive lateral flow aptasensor for the rapid detection of PDGF-BB

    Cheng, NaLiu, YujieMukama, OmarHan, Xiaobo...
    7页
    查看更多>>摘要：Platelet-derived growth factor BB (PDGF-BB) is a potential biomarker of tumor angiogenesis. For the first time, we developed a highly sensitive aptasensor for PDGF-BB with an enhanced test line signal by using two different gold nanoparticles (AuNPs). Herein, we describe a highly sensitive biosensor for PDGF-BB detection that combines biotinylated aptamer on a sample pad and poly thymine-Cy3-AuNP-monoclonal antibody complexes against PDGF-BB immobilized on conjugate pad A. Streptavidin (SA) and rabbit anti-mouse polyclonal antibody were also immobilized in the nitrocellulose membrane at the test and control zones, respectively. When the target PDGF-BB protein was added, it first bound the aptamer, and later the monoclonal antibody to form a biotinylated complex that was captured by SA, resulting in a visual red line on the test zone. In addition, to enhance the sensitivity, another monoclonal antibody against Cy3 was conjugated on AuNP B and immobilized on conjugate pad B to form a AuNPs (A&B)-antibody-(PDGF-BB-Cy3)-aptamer-biotin-SA complex on the test line when a loading buffer was subsequently added. This approach showed a linear response to PDGF-BB from 3 ng mL(-1) to 300 ng mL(-1) with a limit of detection as low as 1 ng mL(-1) obtained in 10 minutes. Our biosensor displayed results through red lines readable by the naked eye. Interestingly, our approach has been successfully applied for real sample verification, proving its applicability for cancer monitoring and diagnosis.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    An efficient and stable inverted perovskite solar cell involving inorganic charge transport layers without a high temperature procedure

    Yang, JienXu, JinjinZhang, QiongXue, Zhilin...
    6页
    查看更多>>摘要：Despite the successful enhancement in the high-power conversion efficiency (PCE) of perovskite solar cells (PSCs), the poor stability of PSCs is one of the major issues preventing their commercialization. The attenuation of PSCs may be due to the lower heat resistance of the organic charge transport layer and the tendency to aggregate at high temperatures. Here we report cerium oxide (CeOx) as an electron transport layer (ETL) prepared through a simple solution processed at a low temperature (similar to 100 degrees C) to replace the organic charge transport layer on top of the inverted planar PSCs. The CeOx layer has excellent charge selectivity and can provide the perovskite film with protection against moisture and metal reactions with the electrode. The solar cell with CeOx as the electron transport layer has a power conversion efficiency of 17.47%. These results may prove a prospect for practical applications.
      原文链接:
    • NSTL
    • Royal Soc Chemistry

    Preparation and characterization of antibacterial dopamine-functionalized reduced graphene oxide/PLLA composite nanofibers

    Li, BiyunXiong, FengYao, BoDu, Qian...
    10页
    查看更多>>摘要：Electrospun poly(l)-lactide (PLLA) ultrafine fibers are a biodegradable and biocompatible scaffold, widely used in tissue engineering applications. Unfortunately, these scaffolds have some limitations related to the absence of bioactivity and antibacterial capacity. In this study, dopamine-functionalized reduced graphene oxide (rGO)/PLLA composite nanofibers were fabricated via electrospinning. The morphology and the physicochemical and biological properties of the composite nanofibers were investigated. The results indicate that incorporating rGO improves the hydrophilic, mechanical, and biocompatibility properties of PLLA nanofibers. Tetracycline hydrochloride (TC)-loaded rGO/PLLA composite nanofibers showed better controlled drug release profiles compared to GO/PLLA and PLLA nanofibrous scaffolds. Drug-loaded nanofibrous scaffolds showed significantly improved antibacterial activity against Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus). Additionally, rGO/PLLA composite nanofibers exhibited enhanced cytocompatibility. Thus, it can be concluded that rGO/PLLA composite nanofibers allow the development of multifunctional scaffolds for use in biomedical applications.
      原文链接:
    • NSTL
    • Royal Soc Chemistry