Publications by authors named "Yunlei Shi"

Article Synopsis
  • In NH capture technologies, the traditional desorption process is energy-intensive and emits CO, typically requiring high temperatures and low pressures.
  • Researchers designed a new light-responsive covalent organic framework (COF-HNU38), which demonstrates a significant NH uptake capacity and selectivity at room temperature and pressure.
  • The innovative COF allows for efficient NH release through light-induced isomerization, maintaining its adsorption capacity over multiple cycles and enhancing desorption efficiency via hydrogen bond interactions.
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Article Synopsis
  • A Pickering emulsion acts as a microreactor for catalysis, relying on emulsifiers, and recent research highlights a metal-organic framework (MOF) that can emulsify water-organic mixtures.
  • The study introduces a modified Zr-MOF (MOF-Cim) that effectively stabilizes CO-responsive Pickering emulsions with low emulsifier content, displaying reversible emulsification and demulsification using CO and N.
  • Demonstrated through nitrobenzene reduction reactions, this approach shows the potential for sustainable chemical processes while allowing for the recycling of emulsifiers at room temperature.
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Ionic liquids (ILs) have been used for carbon dioxide (CO ) capture, however, which have never been used as catalysts to accelerate CO capture. The record is broken by a uniquely designed IL, [EMmim][NTf ]. The IL can universally catalyze both CO sorption and desorption of all the chemisorption-based technologies.

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Ammonia (NH ) is an important chemical raw material and a unique carbon-free fuel with high hydrogen energy density. Thus, NH capture, storage, and desorption are of significant importance. However, high capacity capture, low energy desorption, and selective separation of NH are still challengs so far.

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We propose a vision-proprioception model for planar object pushing, efficiently integrating all necessary information from the environment. A Variational Autoencoder (VAE) is used to extract compact representations from the task-relevant part of the image. With the real-time robot state obtained easily from the hardware system, we fuse the latent representations from the VAE and the robot end-effector position together as the state of a Markov Decision Process.

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Three-dimensional integration technology provides a promising total solution that can be used to achieve system-level integration with high function density and low cost. In this study, a wafer-level 3D integration technology using PDAP as an intermediate bonding polymer was applied effectively for integration with an SOI wafer and dummy a CMOS wafer. The influences of the procedure parameters on the adhesive bonding effects were determined by Si-Glass adhesive bonding tests.

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The micro-bolometer is important in the field of infrared imaging, although improvements in its performance have been limited by traditional materials. SiGe/Si multi-quantum-well materials (SiGe/Si MQWs) are novelty thermal-sensitive materials with a significantly high TCR and a comparably low 1/f noise. The application of such high-performance monocrystalline films in a micro-bolometer has been limited by film integration technology.

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In recent years, metal-organic frameworks (MOFs) have been explored as emulsifiers for the fabrication of Pickering emulsions and then used for hybrid material synthesis and interface catalysis. Nevertheless, stimuli-responsive Pickering emulsions stabilized by MOFs have been rarely reported so far, although they are of great importance for fundamental research studies and practical applications. Herein, for the first time, triethylenetetramine (TETA)-functionalized MOFs (ZIF-90/TETA) have been designed, synthesized, and used for fabricating CO-/N-response Pickering emulsions.

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Pickering emulsions are an excellent platform for interfacial catalysis. However, developing simple and efficient strategies to achieve product separation and catalyst and emulsifier recovery is still a challenge. Herein, we report the reversible transition between emulsification and demulsification of a light-responsive Pickering emulsion, triggered by alternating between UV and visible light irradiation.

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A Gram-stain-positive, aerobic bacterium, designated CPCC 204705, was isolated from a desert soil sample, collected from the Badain Jaran desert. Growth of strain CPCC 204705 was observed at pH 6.0-8.

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The targeted synthesis of three-dimensional covalent organic frameworks (3D COFs) is a great challenge, especially those synthesized by using a new kind of organic linkage. Herein, for the first time, a novel 3D azine-linked COF (3D-HNU5) has been synthesized and characterized. It is shown that the obtained 3D COF has a 2-fold interpenetrated diamond topology, and shows good chemical/thermal stability and a narrow pore size distribution, which exhibits excellent performance in the selective uptake of CO2 over N2.

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The conversion of CO into valuable chemicals is an ideal pathway for CO utilization in industry, although the development of highly efficient catalysts remains a challenge. Herein, the design and synthesis of two covalent organic frameworks (COFs) functionalized with imidazolium salts were reported as catalysts for CO conversion. The resultant COFs possessed highly crystalline structures, showed high stability and surface area, and contained dense catalytic active sites on the pore walls.

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Article Synopsis
  • A new Gram-stain-negative bacterial species, CPCC 100842, was isolated from a freshwater reservoir in southwest China and closely resembles existing species in the Simplicispira genus, particularly Simplicispira metamorpha.
  • Genomic analysis revealed CPCC 100842 has a high 16S rRNA similarity to related bacteria, with significant physical and chemical characteristics identified, including specific fatty acids and lipids.
  • Based on genetic and phenotypic data, CPCC 100842 has been designated as a new species named Simplicispira lacusdiani, with its type strain receiving specific identification numbers (KCTC 52093 and DSM 102231).
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To assess the diversity of actinobacterial taxa in desert sands and obtain the novel microbial resources, 79 and 50 samples were collected from the Badain Jaran (BJD) and Tengger Deserts (TGD) of China, respectively. High-throughput sequencing (HTS) of environmental 16S rRNA genes within these samples was conducted on an Illumina Miseq platform, using universal bacterial primers targeting the V3-V4 hypervariable region. Based on the HTS analyses, cultivation-dependent (CULD) techniques were optimized to identify the cultivable members.

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A new class of donor-acceptor Stenhouse adduct (DASA)-functionalized silica microspheres (SMs) is designed and described to formulate Pickering emulsions with inversion property and large polarity change upon visible light irradiation. By tuning the hydrophilicity of the functional SM particles with visible light, these Pickering emulsions can easily perform inversion from water-in-oil to oil-in-water. The inversion performance of the emulsions is ascribed to DASA photoisomerization from an extended, hydrophobic, and intensely purple-colored triene to a compact, zwitterionic, and colorless cyclopentenone upon irradiation with visible light.

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The creation of CO2-responsive materials that undergo structural transition between micelle and vesicle is of great importance from both theoretical and practical points of view. In this work, we have developed a series of CO2-responsive single-tailed amphiphilic ionic liquids (ILs) composed of N-alkyl-N-methyldiethanolamine cation [CnMDEA](+) (n = 8, 10, 12, 14, 16, 18) and 2-pyrrolidinone [2-Pyr](-) anion. The aggregation behavior and self-assembly structures of the ILs in aqueous solution have been investigated by conductivity, surface tension, dynamic light scattering, cryogenic transmission electron microscopy, small-angle X-ray scattering, and nuclear magnetic resonance spectroscopy.

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