Exploitation of room temperature (RT) photochromism and photomagnetism to induce single-molecule magnet (SMM) behavior has potential applications toward optical switches and magnetic memories, and ...remains a tremendous challenge in the development of new bulk magnets. Herein, a series of chain complexes Ln3(H–HEDP)3(H2–HEDP)3·2H3–TPT·H4–HEDP·10H2O (QDU-1; Ln = Dy (QDU-1(Dy)), Gd (QDU-1(Gd)), and Y (QDU-1(Y)); HEDP = hydroxyethylidene diphosphonate; TPT = 2,4,6-tri(4-pyridyl)-1,3,5-triazine) were synthesized by solvothermal reactions. All the compounds exhibited reversible photochromic and photomagnetic behaviors via UV light irradiation at RT, induced by the photogenerated radicals via a photoinduced electron transfer (PET) mechanism. More importantly, the PET process induced significant variations in magnetic interactions for the Dy(III) congener. Strong ferromagnetic coupling with remarkably slow magnetic relaxation without applied dc fields was observed between DyIII ions and photogenerated O• radicals, showing SMM behavior after RT illumination. For the first time, we observed the reversible RT photochromism and photomagnetism in the lanthanide-based materials. This work realized the radicals-actuated on/off SMM behavior via RT light irradiation, providing a new strategy for constructing the light-induced SMMs.
Abstract
Intrinsic antiferromagnetism in van der Waals (vdW) monolayer (ML) crystals enriches our understanding of two-dimensional (2D) magnetic orders and presents several advantages over ...ferromagnetism in spintronic applications. However, studies of 2D intrinsic antiferromagnetism are sparse, owing to the lack of net magnetisation. Here, by combining spin-polarised scanning tunnelling microscopy and first-principles calculations, we investigate the magnetism of vdW ML CrTe
2
, which has been successfully grown through molecular-beam epitaxy. We observe a stable antiferromagnetic (AFM) order at the atomic scale in the ML crystal, whose bulk is ferromagnetic, and correlate its imaged zigzag spin texture with the atomic lattice structure. The AFM order exhibits an intriguing noncollinear spin reorientation under magnetic fields, consistent with its calculated moderate magnetic anisotropy. The findings of this study demonstrate the intricacy of 2D vdW magnetic materials and pave the way for their in-depth analysis.
Ternary composite electrodes based on carbon nanotubes thin films (CNFs)-loaded graphene oxide (GO) supported poly(3,4-ethylenedioxythiophene)- carbon nanotubes (GO/PEDOT-CNTs) have been prepared via ...a facile one-step electrochemical codeposition method. The effect of long and short CNTs-incorporated composites (GO/PEDOT-lCNTs and GO/PEDOT-sCNTs) on the electrochemical behaviors of the electrodes is investigated and compared. Electrochemical measurements indicate that the incorporation of CNTs effectively improves the electrochemical performances of the GO/PEDOT electrodes. Long CNTs-incorporated GO/PEDOT-lCNTs electrodes have more superior electrochemical behaviors with respect to the short CNTs-incorporated GO/PEDOT-lCNTs electrodes, which can be attributed to the optimized composition and specific microstructures of the former. To verify the feasibility of the prepared composite electrodes for utilization as flexible supercapacitor, a solid-state supercapacitor using the CNFs-loaded GO/PEDOT-lCNTs electrodes is fabricated and tested. The device shows lightweight, ultrathin, and highly flexible features, which also has a high areal and volumetric specific capacitance (33.4 m F cm−2 at 10 mV s−1 and 2.7 F cm−3 at 0.042 A cm−3), superior rate capability, and excellent cycle stability (maintaining 97.5% for 5000 cycles). This highly flexible solid-state supercapacitor has great potential for applications in flexible electronics, roll-up display, and wearable devices.
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•GO/PEDOT-CNTs ternary composites are prepared via a facile electrochemical method.•The long CNTs more effectively improve the capacitive performance of GO/PEDOT.•A lightweight and thin solid-state highly flexible supercapacitor is fabricated.•The supercapacitor device shows a high specific capacitance and cycle stability.
Two novel photochromic and photomagnetic complexes actuated by nonphotochromic ligands have been hydrothermally synthesized through the pillar-layer strategy. After Xe lamp irradiation at room ...temperature, compound 1 shows naked-eye detectable photochromism, while 2 exhibits an efficient photodemagnetization effect.
Adding three cycles of induction chemotherapy with gemcitabine and cisplatin to concurrent chemoradiotherapy improved 3-year recurrence-free survival (85.3%, vs. 76.5% with concurrent ...chemoradiotherapy alone) and overall survival (94.6% vs. 90.3%). Patients receiving induction chemotherapy were more likely to have grade 3 or 4 myelosuppression, nausea, and vomiting.
Background/Aims: Circular RNAs (circRNAs), a type of RNA that is widely expressed in human cells, have essential roles in the development and progression of cancer. CircRNAs contain microRNA (miRNA) ...binding sites and can function as miRNA sponges to regulate gene expression by removing the inhibitory effect of an miRNA on its target gene. Methods: We used the bioinformatics software TargetScan and miRanda to predict circRNA-miRNA and miRNAi-Mrna interactions. Rate of inhibiting of proliferation was measured using a WST-8 cell proliferation assay. Clone formation ability was assessed with a clone formation inhibition test. Cell invasion and migration capacity was evaluated by performing a Transwell assay. Relative gene expression was assessed using quantitative real-time polymerase chain reaction and relative protein expression levels were determined with western blotting. circRNA and miRNA interaction was confirmed by dual-luciferase reporter and RNA-pull down assays. Results: In the present study, the miRNA hsa-miR-21-5p was a target of circRNA-ACAP2, and T lymphoma invasion and metastasis protein 1 (Tiam1) was identified as a target gene of hsa-miR-21-5p. CircRNA-ACAP2 and Tiam1 were shown to be highly expressed in colon cancer tissue and colon cancer SW480 cells, but miR-21-5p was expressed at a low level. SW480 cell proliferation was suppressed when the expression of circRNA-ACAP2 and Tiam1 was decreased and the expression of miR-21-5p was increased in vivo and in vitro. SW480 cell migration and invasion were also inhibited under the same circumstance. The circRNA-ACAP2 interaction regulated the expression of miR-21-5p, and miR-21-5p regulated the expression of Tiam1. Down-regulation of circRNA-ACAP2 promoted miR-21-5p expression, which further suppressed the transcription and translation of Tiam1. Conclusion: The present study shows that the circRNA-ACAP2/hsa-miR-21-5p/Tiam1 regulatory feedback circuit could affect the proliferation, migration, and invasion of colon cancer SW480 cells. This was probably due to the fact that circRNA-ACAP2 could act as a miRNA sponge to regulate Tiam1 expression by removing the inhibitory effect of miR-21-5p on Tiam1 expression. The results from this study have revealed new insights into the pathogenicity of colon cancer and may provide novel therapeutic targets for the treatment of colon cancer.
Photoswitchable room temperature phosphorescence (RTP) materials are of great interest due to their potential applications in optical devices and switches. Herein, two Zn‐based coordination polymers ...(CPs) (H3‐TPB)·Zn6(H‐HEDP)(HEDP)3(H2O)2·5H2O (complex 1; HEDP = hydroxyethylidene diphosphonate; TPB = 1,3,5‐tris(4‐pyridyl)benzene) and (H‐TPB)·Zn3(H‐HEDP)(HEDP)(H2O)·2H2O (complex 2) with distinguishable photochromism and tunable RTP are synthesized involving photoactive TPB molecules with different packing modes. Complex 1 exhibits bidirectionally on/off RTP regulation via on‐switch with excitation of 250−330 nm light and off‐switch with 350−380 nm, and the “turn‐on” behavior can be attributed to the advance of Förster resonance energy transfer‐assisted intersystem crossing (ISC) process while “turn‐off” process due to the transformation from H3‐TPB cations to H3‐TPB· radicals. Complex 2 exhibits photoswitchable RTP accompanied with reversible photochromism by leveraging the self‐absorption and RTP emission. Two demos based on the above compounds are further applied to demonstrate the application in information recording and encryption fields. This work supplies a strategy toward the design of switchable RTP systems using electron transfer photochromism, shedding light on broadening the frontiers of photoresponsive materials.
This study for the first time exhibits the bidirectional on/off room temperature phosphorescence regulation via on‐switch with excitation of 250−330 nm and off‐switch with 350−380 nm light irradiation in an electron transfer photochromic complex, and two demos are further applied to demonstrate the application of the compounds in information recording and encryption fields.
Cold chain logistics (CCL) is not only vital for maintaining the quality and safety of fresh agro-products and reducing losses but also provides important support to help increase farmer income and ...thereby promote the revitalization of rural industry in China. In recent years, numerous studies have focused on improving the efficiency and sustainability of CCL, and the results have important implications for promoting innovation, applying technologies, improving facilities and equipment, and optimizing management in the CCL industry.
This review discusses active research areas, gaps in the existing state of research, and future research challenges for CCL. Furthermore, we summarize the current status of China's CCL industry and technology and compare the state of CCL development in China with that in more developed countries in terms of infrastructure, data handling, and national policies.
The future trends of CCL involve low carbon strategies and intelligent innovation, which are the key to meeting environmental concerns and the evolving needs of the market. Advances in next-generation information technology (including IoT, blockchain, AI, etc.) have significantly accelerated the modernization of CCL. Meanwhile, attaining these dual objectives of a low-carbon footprint and intelligent innovation requires cooperation between national regulators, industry, consumers, and interdisciplinary experts. A key finding of this review is that national policy and financial intervention in China are expected to be the main forces behind renovating infrastructure and upgrading standardization, which is required to narrow the CCL development gap between China and other more developed nations.
•An intelligent and sustainable CCL is vital to meet the evolving needs of the market.•The future of CCL depends on collaborative innovation in the various cold chain stages.•Industry 4.0 technology can be widely applied in CCL.•Developing CCL in China requires government regulation and financial intervention.•The sound development of CCL requires the concerted efforts by all stakeholders.
A simple and effective quantum dots (QDs)-based sensing method for copper ion (Cu2+) in water is developed with improved selectivity and ultrahigh sensitivity in the presence of thiosulfate. For ...this, hexadecyl trimethylammonium bromide (CTAB) modified CdSe/ZnS QDs is used as a fluorescent probe. In the absence of thiosulfate, mercury and silver ions show strong interference with Cu2+ ions even though the sensitivity can be obtained within a few nanomolar. By using our method, the lowest detected concentration for Cu2+ is 0.15 nM in the presence of thiosulfate in DI water. Also, it is successfully demonstrated for Cu2+ ion detection in practical application (tap water) down to lowest detection limit, 0.14 nM. This method provides a good potential for copper ions detection with simplicity, rapidity, ultrahigh sensitivity, and excellent selectivity.
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