Molecularly Ordered Nanoporous Organosilicates Prepared with and without Surfactants

The first example of pure periodic mesoporous organosilica (O3/2Si−CHCH−C6H4−CHCH−SiO3/2) containing aromatic and olefinic functional groups was synthesized using a single precursor. In addition to the long-range order of the pore system, this material exhibited a structural periodicity with a spacing of 11.9 Å due to the formation of lamellar bis(ethen-2-yl)benzene silica within the pore walls. It was also demonstrated that the molecular order can be achieved regardless of the occurrence of a periodic pore system or the use of surfactants

sj-pdf-1-imr-10.1177_03000605231195156 - Supplemental material for MRI radiomics-based evaluation of tuberculous and brucella spondylitis

Supplemental material, sj-pdf-1-imr-10.1177_03000605231195156 for MRI radiomics-based evaluation of tuberculous and brucella spondylitis by Wenhui Wang, Zhichang Fan and Junping Zhen in Journal of International Medical Research</p

sj-pdf-2-imr-10.1177_03000605231195156 - Supplemental material for MRI radiomics-based evaluation of tuberculous and brucella spondylitis

Supplemental material, sj-pdf-2-imr-10.1177_03000605231195156 for MRI radiomics-based evaluation of tuberculous and brucella spondylitis by Wenhui Wang, Zhichang Fan and Junping Zhen in Journal of International Medical Research</p

CuBr-Catalyzed Aerobic Decarboxylative Cycloaddition for the Synthesis of Indolizines under Solvent-Free Conditions

An efficient synthesis of diversified indolizine derivatives was developed via CuBr-catalyzed reaction of pyridines, methyl ketones and alkenoic acids under solvent-free conditions in oxygen atmosphere. This synthesis involves cascade processes of copper-catalyzed bromination of the methyl ketone, 1,3-dipolar cycloaddition of the pyridinium ylide with the alkenoic acid, followed by oxidative decarboxylation and dehydrogenative aromatization of the primary cycloadduct. By this protocol, a wide range of indoliznes with different substitution patterns were selectively prepared in one pot from simple substrates in good to excellent yields

Unconventional bound states in the continuum from metamaterial induced electron-acoustic plasma waves

Photonic bound states in the continuum are spatially localised modes with infinitely long lifetimes that exist within a radiation continuum at discrete energy levels. These states have been explored in various systems where their emergence is either guaranteed by crystallographic symmetries or due to topological protection. Their appearance at desired energy levels is, however, usually accompanied by non-BIC resonances, from which they cannot be disentangled. Here, we propose a new generic mechanism to realize bound states in the continuum that exist by first principles free of other resonances and are robust upon parameter tuning. The mechanism is based on the fundamental band in double-net metamaterials, which provides vanishing homogenized electromagnetic fields. We predict two new types of bound states in the continuum: i) generic modes confined to the metamaterial bulk, mimicking electronic acoustic waves in a hydrodynamic double plasma, and ii) topological surface bound states in the continuum

CuBr-Catalyzed Aerobic Decarboxylative Cycloaddition for the Synthesis of Indolizines under Solvent-Free Conditions

An efficient synthesis of diversified indolizine derivatives was developed via CuBr-catalyzed reaction of pyridines, methyl ketones and alkenoic acids under solvent-free conditions in oxygen atmosphere. This synthesis involves cascade processes of copper-catalyzed bromination of the methyl ketone, 1,3-dipolar cycloaddition of the pyridinium ylide with the alkenoic acid, followed by oxidative decarboxylation and dehydrogenative aromatization of the primary cycloadduct. By this protocol, a wide range of indoliznes with different substitution patterns were selectively prepared in one pot from simple substrates in good to excellent yields

Enhancing Light Emission of ZnO Microwire-Based Diodes by Piezo-Phototronic Effect

Light emission from semiconductors depends not only on the efficiency of carrier injection and recombination but also extraction efficiency. For ultraviolet emission from high band gap materials such as ZnO, nanowires have higher extraction efficiencies than thin films, but conventional approaches for creating a p–n diode result in low efficiency. We exploited the noncentral symmetric nature of n-type ZnO nanowire/p-type GaN substrate to create a piezoelectric potential within the nanowire by applying stress. Because of the polarization of ions in a crystal that has noncentral symmetry, a piezoelectric potential (piezopotential) is created in the crystal under stress. The piezopotential acts as a “gate” voltage to tune the charge transport and enhance carrier injection, which is called the piezo-phototronic effect. We propose that band modification traps free carriers at the interface region in a channel created by the local piezoelectric charges. The emission intensity and injection current at a fixed applied voltage have been enhanced by a factor of 17 and 4, respectively, after applying a 0.093% compressive strain and improved conversion efficiency by a factor of 4.25. This huge enhanced performance is suggested arising from an effective increase in the local “biased voltage” as a result of the band modification caused by piezopotential and the trapping of holes at the interface region in a channel created by the local piezoelectric charges near the interface. Our study can be extended from ultraviolet range to visible range for a variety of optoelectronic devices that are important for today’s safe, green, and renewable energy technology

Highly Efficient H₂O₂ Electrogeneration Enabled by Controlling the Wettability of Gas Diffusion Electrodes and the Reaction Pathway in Divided Cells

Efficient electrochemical synthesis of H2O2 via a two-electron oxygen reduction reaction (2e–-ORR) has been intensively pursued in the past few years, yet its potential application is still challenging due to the slow transportation of gaseous reactants and numerous competitive reactions in the electrolytic cell. Herein, we report that efficient electrochemical production of H2O2 can be achieved via tuning the wettability of the gas diffusion electrode (GDE) to the Wenzel–Cassie coexistence state (WCS) and controlling the electrochemical reaction pathway using a proton exchange membrane (PEM) divided cell. By tuning the wettability, the electrogeneration of H2O2 reached to 1326 mM with 59% current efficiency after 120 min. It is revealed that the reaction pathway for 2e–-ORR can be controlled by manipulating the crossover or diffusion of the ions or intermediate reactants via different membranes, and the electrogeneration of H2O2 is about 10 times higher in the PEM-divided cell compared to that in the undivided cell. These findings highlight the importance of GDE surface wettability and the reaction pathway for electrochemical synthesis of H2O2, paving an alternative way to develop efficient electrochemical synthesis systems

Additional file 1 of Similar proteome expression profiles of the aggregated lymphoid nodules area and Peyer’s patches in Bactrian camel

Supplementary Material