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Graefe's Archive For Clinical and... Jun 2024
PubMed: 38949667
DOI: 10.1007/s00417-024-06563-1 -
Nanoscale Jul 2024Possessing excellent electronic properties and high chemical stability, semiconducting n-type two-dimensional (2D) tin dioxide (SnO) nanosheets have been featured in...
Possessing excellent electronic properties and high chemical stability, semiconducting n-type two-dimensional (2D) tin dioxide (SnO) nanosheets have been featured in sensing and electrocatalysis applications recently. Derived from non-layered crystal structures, 2D SnO has abundant unsaturated dangling bonds existing at the surface, providing interfacial activity. How the surface chemistry alters the electronic properties of 2D SnO nanomaterials remains unexplored. In this study, we synthesised ultra-thin 2D SnO nanosheets using a liquid metal (LM) touch printing technique and investigated experimentally and theoretically how the interactions of organic solvents composed of alkyl and hydroxyl groups with the surface of LM-derived 2D SnO modulate the electronic properties. It was found that alkane solvents can physically absorb onto the SnO surface with no impact on the material conductivity. Alcohol-based solvents on the other hand interact with the SnO surface chemical absorptions primarily, in which oxygen atoms of hydroxyl groups in the alcohols form bonds with the surface atoms of SnO. The binding stability is determined by the length and configuration of the hydrocarbon chain in alcohols. As representative long-chain alcohols, 1-octanol and 1-pentanol attach onto the SnO surface strongly, lowering the binding energy of Sn and reducing the electron transfer ability of SnO nanosheets. Consequently, the electronic properties, conductivity and electronic mobility of SnO nanosheet-based electronic devices are decreased significantly.
PubMed: 38949653
DOI: 10.1039/d4nr01841a -
The Journal of Physical Chemistry... Jul 2024To create complementary metal oxide semiconductor compatible molecular devices, more insights into the electrode property regarding its metal/semiconductor doping level...
To create complementary metal oxide semiconductor compatible molecular devices, more insights into the electrode property regarding its metal/semiconductor doping level and creating a functional molecular device are required. In this work, we constructed an EGaIn/alkanethiol/Au-Si molecular diode (with a rectification ratio of 50.70) induced by Schottky barriers within a gold-silicon doped electrode instead of the functional property of molecules. The relationship between the rectification ratio and the number of methylene units in alkanethiol was analyzed, revealing a gradual increase in the ratio from 3.33 for CHS to 50.70 for CHS. The rectification ratio of the junction is well modulated by the temperature due to the change in the Schottky barrier. Such a mechanism is explained by the energy band diagrams of the surface space charge region and a combination of density functional theory and Keldysh-Green formalism calculations.
PubMed: 38949616
DOI: 10.1021/acs.jpclett.4c01351 -
Angewandte Chemie (International Ed. in... Jul 2024Two-dimensional covalent organic frameworks (2D-COFs) have recently emerged as fascinating scaffolds for solar-to-chemical energy conversion because of their...
Two-dimensional covalent organic frameworks (2D-COFs) have recently emerged as fascinating scaffolds for solar-to-chemical energy conversion because of their customizable structures and functionalities. Herein, two tris(triazolo)triazine-based COF materials (namely COF-JLU51 and COF-JLU52) featuring large surface area, high crystallinity, excellent stability and photoelectric properties were designed and constructed for the first time. Remarkably, COF-JLU51 gave an outstanding H2O2 production rate of over 4200 µmol g-1 h-1 with excellent reusability in pure water and O2 under one standard sun light, that higher than its isomorphic COF-JLU52 and most of the reported metal-free materials, owing to its superior generation, separation and transport of photogenerated carriers. Experimental and theoretical researches prove that the photocatalytic process undergoes a combination of indirect 2e- O2 reduction reaction (ORR) and 4e- H2O oxidation reaction (WOR). Specifically, an ultrahigh yield of 7624.7 µmol g-1 h-1 with apparent quantum yield of 18.2% for COF-JLU52 was achieved in a 1:1 ratio of benzyl alcohol and water system. This finding contributes novel, nitrogen-rich and high-quality tris(triazolo)triazine-based COF materials, and also designate their bright future in photocatalytic solar transformations.
PubMed: 38949611
DOI: 10.1002/anie.202411546 -
Organic Letters Jul 2024Minisci-type dehydrogenative coupling of C(sp)-H and N-heteroaromatics was performed with -hydroxysuccinimide as a hydrogen atom transfer catalyst in a...
Minisci-type dehydrogenative coupling of C(sp)-H and N-heteroaromatics was performed with -hydroxysuccinimide as a hydrogen atom transfer catalyst in a photoelectrochemical cell composed of a mesoporous BiVO photoanode and a Pt electrode. In the absence of metal catalysts and chemical oxidants, a range of -heteroarenes (e.g., quinolines, isoquinolines, and quinoxaline) can undergo coupling with various C(sp)-H partners to form the corresponding products in excellent yields.
PubMed: 38949597
DOI: 10.1021/acs.orglett.4c01998 -
Physical Chemistry Chemical Physics :... Jul 2024To date, the potential exploitation of hybrid organic-inorganic perovskites (HOIPs) in photovoltaic technologies has been significantly hampered by their poor...
To date, the potential exploitation of hybrid organic-inorganic perovskites (HOIPs) in photovoltaic technologies has been significantly hampered by their poor environmental stability. HOIP degradation can be triggered by conventional operational environments, with excessive heating and exposure to oxygen and moisture significantly reducing the performances of HOIP-based solar cells. An imperative need emerges for a thorough investigation on the impact of these factors on the HOIP stability. In this work, the degradation of methylammonium lead bromide (CHNHPbBr) thin films, deposited spin-coating on indium tin oxide (ITO) and strontium titanate (STO) substrates, was investigated by combining Raman and ultraviolet-visible (UV-Vis) absorption spectroscopy, as well as optical and fluorescence microscopy. We assessed the physical and chemical degradation of the films occurring under diverse preservation conditions, shedding light on the byproducts emerging from different degradation pathways and on the optimal HOIP preservation conditions.
PubMed: 38949556
DOI: 10.1039/d4cp01509f -
Soft Matter Jul 2024Bioinspired soft actuators, capable of undergoing shape deformation in response to external triggers, hold great potential in fields such as soft robotics, artificial...
Bioinspired soft actuators, capable of undergoing shape deformation in response to external triggers, hold great potential in fields such as soft robotics, artificial muscles, drug delivery, and smart switches. However, their widespread application is hindered by limitations in responsiveness, durability, and complex fabrication processes. In this study, we propose a new approach to tackle these challenges by developing a single-layer soft actuator that responds to multiple stimuli using a straightforward solution-casting method. This actuator comprises bio-polymer gelatin, bio-compatible PEDOT:PSS, and iron oxide (FeO) nanoparticles. Our actuator exhibits responsiveness to a range of organic solvent vapors, including water vapor, light, and magnetic fields. Notably, it exhibits rapid and reversible bending in distinct directions in response to different vapors, bending upwards in the presence of water vapor and downwards in the presence of alcohol vapor. Moreover, exposure to infrared (IR) light induces a bending toward the light source. The incorporation of magnet-responsive FeO nanoparticles induces multi-functionality in the actuator. The actuation characteristics of the actuator are controlled by leveraging its responsiveness to dual stimuli, such as water vapor and magnetic fields, as well as light and magnetic fields. For the proof of concept, we showcase several potential applications of our multi-stimuli responsive soft actuator, including magnet-triggered electrical switches, cargo transportation, soft grippers, targeted drug delivery, energy harvesting, and bio-mimicry.
PubMed: 38949520
DOI: 10.1039/d4sm00513a -
International Journal of Paediatric... Jul 2024Polymorphisms in genes related to enamel formation and mineralization may increase the risk of developmental defects of enamel (DDE). (Review)
Review
BACKGROUND
Polymorphisms in genes related to enamel formation and mineralization may increase the risk of developmental defects of enamel (DDE).
AIM
To evaluate the existing literature on genetic polymorphisms associated with DDE.
DESIGN
This systematic review was registered in the PROSPERO (CRD42018115270). The literature search was performed in PubMed, Scopus, Web of Science, LILACS, BBO, Cochrane Library, and in the gray literature. Observational studies assessing the association between DDE and genetic polymorphism were included. The Newcastle-Ottawa Scale was used to assess the risk of bias.
RESULTS
One thousand one hundred and forty-six articles were identified, and 28 met the inclusion criteria. Five studies presented a low risk of bias. Ninety-two genes related to enamel development, craniofacial patterning morphogenesis, immune response, and hormone transcription/reception were included. Molar-incisor hypomineralization (MIH) and/or hypomineralization of primary second molars (HPSM) were associated with 80 polymorphisms of genes responsible for enamel development, immune response, morphogenesis, and xenobiotic detoxication. A significant association was found between the different clinical manifestations of dental fluorosis (DF) with nine polymorphisms of genes responsible for enamel development, craniofacial development, hormonal transcription/reception, and oxidative stress. Hypoplasia was associated with polymorphisms located in intronic regions.
CONCLUSION
MIH, HPSM, DF, and hypoplasia reported as having a complex etiology are significantly associated with genetic polymorphisms of several genes.
PubMed: 38949474
DOI: 10.1111/ipd.13233 -
ACS Applied Materials & Interfaces Jul 2024Periodontitis, an inflammatory bone resorption disease associated with dental plaque, poses significant challenges for effective treatment. In this study, we developed...
Periodontitis, an inflammatory bone resorption disease associated with dental plaque, poses significant challenges for effective treatment. In this study, we developed Mino@ZIF-8 nanoparticles inspired by the periodontal microenvironment and the unique properties of zeolitic imidazolate framework 8, aiming to address the complex pathogenesis of periodontitis. Transcriptome analysis revealed the active engagement of Mino@ZIF-8 nanoparticles in innate and adaptive inflammatory host defense and cellular metabolic remodeling. Through sustained release of the anti-inflammatory and antibacterial agent minocycline hydrochloride (Mino) and the generation of Zn with pro-antioxidant effects during degradation, Mino@ZIF-8 nanoparticles synergistically alleviate inflammation and oxidative damage. Notably, our study focuses on the pivotal role of zinc ions in mitochondrial oxidation protection. Under lipopolysaccharide (LPS) stimulation, periodontal ligament cells undergo a metabolic shift from oxidative phosphorylation (OXPHOS) to glycolysis, leading to reduced ATP production and increased reactive oxygen species levels. However, Zn effectively rebalances the glycolysis-OXPHOS imbalance, restoring cellular bioenergetics, mitigating oxidative damage, rescuing impaired mitochondria, and suppressing inflammatory cytokine production through modulation of the AKT/GSK3β/NRF2 pathway. This research not only presents a promising approach for periodontitis treatment but also offers novel therapeutic opportunities for zinc-containing materials, providing valuable insights into the design of biomaterials targeting cellular energy metabolism regulation.
PubMed: 38949426
DOI: 10.1021/acsami.4c05722 -
Small (Weinheim An Der Bergstrasse,... Jul 2024To meet increasing requirement for innovative energy storage and conversion technology, it is urgent to prepare effective, affordable, and long-term stable oxygen...
Bimetal Oxides Anchored on Carbon Nanotubes/Nanosheets as High-Efficiency and Durable Bifunctional Oxygen Catalyst for Advanced Zn-Air Battery: Experiments and DFT Calculations.
To meet increasing requirement for innovative energy storage and conversion technology, it is urgent to prepare effective, affordable, and long-term stable oxygen electrocatalysts to replace precious metal-based counterparts. Herein, a two-step pyrolysis strategy is developed for controlled synthesis of FeO and MnO anchored on carbon nanotubes/nanosheets (FeO-MnO-CNTs/NSs). The typical catalyst has a high half-wave potential (E = 0.87 V) for oxygen reduction reaction (ORR), accompanied with a smaller overpotential (η = 290 mV) for oxygen evolution reaction (OER), showing substantial improvement in the ORR and OER performances. As well, density functional theory calculations are performed to illustrate the catalytic mechanism, where the in situ generated FeO directly correlates to the reduced energy barrier, rather than MnO. The FeO-MnO-CNTs/NSs-based Zn-air battery exhibits a high-power density (153 mW cm) and satisfyingly long durability (1650 charge/discharge cycles/550 h). This work provides a new reference for preparation of highly reversible oxygen conversion catalysts.
PubMed: 38949416
DOI: 10.1002/smll.202402104