Considerable progress has been made in synthesizing two-dimensional(2D)materials by exfoliating layered ***;for tremendous non-layered inorganic materials;especially magnet solids;usually with closely packed bulk phas...
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Considerable progress has been made in synthesizing two-dimensional(2D)materials by exfoliating layered ***;for tremendous non-layered inorganic materials;especially magnet solids;usually with closely packed bulk phases by strong chemical bonds;it is challenging to obtain their high-quality 2D ***;we highlighted a new structure of free-standing ferromagnetic nanosheets featuring(111)*** magnet;Fe_(3)O_(4);its inversed spinel crystalline has limited abilities to exfoliate into 2D forms and rarely exists as free-standing nanosheets owing to aggregation induced by magnetic *** realized a breakthrough in achieving free-standing ferromagnetic nanosheets with dramatically surpassing size limitations via topotactic conversion from layered *** Fe_(3)O_(4) nanosheets exhibited a maximum width of 60μm while onl y~4 nm thick;prominently exposing(111)facets.2D Fe_(3)O_(4) behaved anisotropic magnetism;which displayed a 4.6 emu g^(-1) moment(H=500 Oe)in the(111)plane but 2.1 emu g^(-1)out of the(111)plane;indicating a(111)in-plane easy *** anticipated our topotactic conversion strategy would inspire the creation of 2D non-layered materials and enrich the 2D materials family.
Quantum wells and superlattices are key building blocks in the semiconductor industry,normally fabricated using epitaxial growth techniques,such as vapor phase epitaxy,metalorganic chemical vapor deposition and molecu...
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Quantum wells and superlattices are key building blocks in the semiconductor industry,normally fabricated using epitaxial growth techniques,such as vapor phase epitaxy,metalorganic chemical vapor deposition and molecular beam ***,these complicated preparation processes,as well as their high cost,limit their extensive *** is essential to develop a simple solution process for building ***,we demonstrate an ion exchange strategy for synthesizing an allinorganic superlattice cesium lead bromide/layered double hydroxides(CsPbBr_3/LDH)in *** room temperature,the perovskite ions diffuse into the interlayer of LDH and assemble into layered perovskite with various *** with traditional organic-inorganic hybrid perovskite superlattice,the all-inorganic perovskite superlattice CsPbBr_(3)/LDH has weak quantum confinement,which exhibits narrow emission line-widths of 20 nm,high quantum yields of 55%,and radiative lifetimes of several *** findings offer a new route to synthesize novel perovskite superlattices and enrich the perovskite supercrystal platform for electronics,photonics and optoelectronics devices.
The in vitro expansion of stem cells is important for their application in different life science fields such as cellular tissue and organ *** objective of this paper was to achieve static cell culture in vitro throug...
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The in vitro expansion of stem cells is important for their application in different life science fields such as cellular tissue and organ *** objective of this paper was to achieve static cell culture in vitro through peptide hydrogel-supported microspheres(MSs).The peptides,with their gel-forming properties,microstructures,and mechanical strengths characterized,were found to have good support for the MSs and to be *** internal structures of poly(L-lactic acid)microspheres(PLLA-MSs)and polystyrene microspheres(PS-MSs)made in thelaboratory were observed and statistically analyzed in terms of particle size and pore size,following which the co-cultured MSs with cells were found to have good cell *** addition,three-dimensional(3D)culturing of cells was performed on the peptide and microcarrier composite scaffolds to measure cell viability and cell *** results showed that the peptides could be stimulated by the culture medium to self-assembly form a 3D fiber network *** the peptide-Ms composite scaffold-based cell culture system,further enhancement of the cell culture effect was *** peptide-Ms composite scaffolds have great potential for the application in 3D cell culture and in vitro cellexpansion.
Zn-N_(2)batteries,which are comprised of nitrogen reduction reaction(NRR)and oxygen evolution reaction(OER),represent an emerging technology for efficient ammonia production and simultaneous power ***,the intrinsic li...
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Zn-N_(2)batteries,which are comprised of nitrogen reduction reaction(NRR)and oxygen evolution reaction(OER),represent an emerging technology for efficient ammonia production and simultaneous power ***,the intrinsic limitations of NRR and OER currently preclude its *** this paper,Co and B co-doped Lavoisier framework series materials(MIL)are *** mass transfer is rendered feasible with B_(0.25)-MIL-88-Fe_(4)Co_(1) by the distinctive double cone microrods *** addition of soft acid metal node Co^(2+)and B with defective electronic structure modifies the electronic configuration of *** the same time,doping causes defects in the metal-organic frameworks,expands effectively the pore size,and increases the specific surface area,thereby expediting the adsorption of N_(2)and the release of O_(2).The electrocatalysis results show that the dual-doping scheme increases the NH_(3)yield(127.27μg^(-1)h^(-1)mg_(cat)^(-1))and Faraday efficiency(25.81%)while reducing the overpotential of OER(330 mV),achieving a power density of 8.30 mW cm^(-2)for Zn-N_(2)*** discovery implements another avenue for the exploration of Zn-N_(2)battery materials and holds broader significance for advancing the field of energy storage and conversion.
This paper explores a double quantum images representation(DNEQR)model that allows for simultaneous storage of two digital images in a quantum superposition ***,a new type of two-dimensional hyperchaotic system based ...
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This paper explores a double quantum images representation(DNEQR)model that allows for simultaneous storage of two digital images in a quantum superposition ***,a new type of two-dimensional hyperchaotic system based on sine and logistic maps is investigated,offering a wider parameter space and better chaotic behavior compared to the sine and logistic *** on the DNEQR model and the hyperchaotic system,a double quantum images encryption algorithm is ***,two classical plaintext images are transformed into quantum states using the DNEQR ***,the proposed hyperchaotic system is employed to iteratively generate pseudo-random *** chaotic sequences are utilized to perform pixel value and position operations on the quantum image,resulting in changes to both pixel values and ***,the ciphertext image can be obtained by qubit-level diffusion using two XOR operations between the position-permutated image and the pseudo-random *** corresponding quantum circuits are also *** results demonstrate that the proposed scheme ensures the security of the images during transmission,improves the encryption efficiency,and enhances anti-interference and anti-attack capabilities.
Indole-derived radical cations, open-shell reactive species, display distinctive dual reactivity due to the carbon-centered radical and more electrophilic carbocation, which frequently appear in a variety of single el...
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Indole-derived radical cations, open-shell reactive species, display distinctive dual reactivity due to the carbon-centered radical and more electrophilic carbocation, which frequently appear in a variety of single electron oxidation reactions for synthesizing structurally diverse functionalized indoles and indolines. Electrocatalysis is considered as a synthetically attractive and environmentally friendly alternative for driving the single electron oxidation of indoles. Remarkable achievements in electrocatalytic indolederived radical cation-mediated indole functionalization have been realized so far. This review comprehensively summarizes the recent progresses in the applications of electrocatalytic indole radical cations,including C(sp~2)–H functionalization, dearomative 2,3-difunctionalization, and ring-opening reaction, emphasizing the vital single electron oxidation steps of indoles, the substrates scope and limitations, and the reaction mechanisms.
White light-emitting diodes(WLEDs)as energy-saving light sources are widely used to alleviate the rising electric *** commercial WLEDs are blue/yellow-mixed emitting devices,which have some disadvantages,such as physi...
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White light-emitting diodes(WLEDs)as energy-saving light sources are widely used to alleviate the rising electric *** commercial WLEDs are blue/yellow-mixed emitting devices,which have some disadvantages,such as physiological damages of rich blue light,complex device structure and color *** is essential to develop single-component WLEDs with quasi-solar spectrum to overcome these *** we demonstrate a high-performance single-component WLED based on donor-acceptor integrated carbon nitride(DACN)*** donor-acceptor simultaneously increases the photoluminescence efficiency and the carrier mobility of graphitic carbon nitride(g-CN),hence,the DACN-based WLED reaches a milestone in maximum luminance of 2,045 cdm^(-2)and maximum external quantum efficiency of 2.2%,which are one order of magnitude higher than pristine g-CN-based ***,the DACN-based WLED emits broadband white light with color coordinates of(0.34,0.44)and a color temperature of 5,163 *** works open a way to boost optoelectronic properties of g-CN materials and show their promising application in single-component WLEDs.
Amyloid β-protein(Aβ) and Tau, two common pathogenic proteins associated with Alzheimer’s disease(AD), cross-interact, and thus co-assemble into hybrid aggregates. However, molecular mechanism of the cross-interact...
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Amyloid β-protein(Aβ) and Tau, two common pathogenic proteins associated with Alzheimer’s disease(AD), cross-interact, and thus co-assemble into hybrid aggregates. However, molecular mechanism of the cross-interactions remains unclear. To explore the issue, docking and molecular dynamics(MD) simulations were coupled to study the cross-interactions between Aβ pentamer and Tau pentamer. Four stable hybrid decamer conformations including double layer, single layer, block, and part-in were obtained by protein-protein docking software HADDOCK 2.2. Then, MD simulations were used to explore the molecular mechanism of cross-interactions between Aβ pentamer and Tau pentamer. The results of MD simulations showed that the part-in structure was the most stable among all the above four representative ones. The binding energy between Aβ and Tau was about-759.77 kJ·mol-1in the part-in structure. Moreover, the part-in conformation would undergo conformational transition, which would improve its hydrophobicity and make the structure more compact. This work offers a structural understanding of cross-interactions between Aβ and Tau linked to AD.
Silicon-containing arylacetylene (PSA) resins have broad application prospects because of their excellent heat ***,improving their mechanical properties and interfacial bonding with reinforcement fibers while maintain...
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Silicon-containing arylacetylene (PSA) resins have broad application prospects because of their excellent heat ***,improving their mechanical properties and interfacial bonding with reinforcement fibers while maintaining heat resistance is a challenge in engineering ***,poly(diethynylbenzene-methylsilyl-3-benzonitrile)(DEB-CN) and poly(diethynylbenzene-methylsilyl-3,6-diethynylcarbazole-3-benzonitrile)(DEC-CN) were synthesized via an isopropylmagnesium chloride lithium-chloride complex (i-PrMgCl·LiCl),overcoming the compatibility problem between cyano groups and Grignard *** cyano and alkyne groups in the resin underwent cyclization to form pyridine,catalyzed by the-NH-moiety in DEC-CN,resulting in extremely high thermal stability (5%weight loss temperature:669.3°C,glass transition temperature>650°C).The combination of cyano dipole-dipole pairing and hydrogen bonding greatly enhanced the resin-fiber interface properties,while the generated pyridine promoted stress relief in the crosslinked network,substantially improving the mechanical properties of the cyano-silicon-containing arylacetylene resin *** flexural strength of quartz fiber cloth/DEC-CN composites was 298.2 MPa at room temperature and 145.9 MPa at 500°C,corresponding to 84.0%and 127.6%enhancements,respectively,over the cyano-free *** cyano-silicon-containing arylacetylene resins exhibited a dual reinforcement mechanism involving physical interfacial interactions and chemical crosslinking,achieving a good balance between thermal stability and mechanical properties.
Electrospun nanofibers are regarded as a promising candidate for filtration because of their prominent size *** precise control of nanofiber diameter is the key to the material’s outstanding filtration capability,but...
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Electrospun nanofibers are regarded as a promising candidate for filtration because of their prominent size *** precise control of nanofiber diameter is the key to the material’s outstanding filtration capability,but it remains a ***,an electrohydrodynamic scaling model is established for the accurate prediction of fiber diameter based on the velocity of the whipping *** this model,the velocity reflects jet stretching and is tuned by adding *** theoretical predictions agree well with the experimental *** the proposed diameter model,the filtration property of the membrane is significantly optimized by governing the fiber *** the nanofiber is slenderized to 183 nm,an ultralight (0.521 g m;) membrane exhibits high filtration efficiency (99.93%) and low pressure drop (105.2 Pa) against ultrafine aerosol particles (≤0.26μm) under an airflow face velocity of 5.33 cm s^(-1).These findings demonstrate that the established surface charge-based diameter model provides an excellent platform to timely and accurately control the nanofiber diameter via the velocity of whipping jets for highefficiency air filtration.
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