Penetrating honeycomb structured MOF flexible membrane with ultrahigh flux and excellent catalytic activity

Li Wan,Mingwei Yuan,Guowen Xiong,Shunli Shi,Weiming Xiao,Chao Chen,Fanrong Ai 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-

MOF-polymer mixed matrix catalytic membrane has excellent potential for applications in continuousflow separation and catalysis. However, scalable fabrication methods to produce ultra-high flux mixedmatrix catalytic membranes are urgently needed yet to be largely met. Inspired by the honeycomb structure,composite MOF with polymer materials possessing rapidly prepare large area MOF-polymer mixedmatrix catalytic membrane with penetrated honeycomb structure. The bulk loading of MOFs linked thewalls of the honeycomb, endowing the MOF-polymer mixed matrix membrane with large surface areasand abundant pore channels. The porous MOF material links the pore walls of the honeycomb structure,which not only enables the rapid passage of reactants, but also greatly enhances the mutual contact betweenthe membrane and the reactants, achieving rapid passage and efficient catalysis. The 0.6-ZIF-8/Pd-TPU porosity reaches 69% and the specific surface area can reach 828.35 m2/g. The water flux reached3290 L m2 h1 and the treatment efficiency of different dyes and 4-NP under vacuum pump filtrationreached 99%. This preparation method was extended to other porous materials, and membranes weresuccessfully prepared with good catalytic effects. This strategy paves the way for the development of highflux and efficient catalytic membranes.

Influence of Transport Properties of Laminated Membrane-fabric on Thermal Protective Performance Against Steam Hazard

Yun Su,Rui Li,Jie Yang,Chunhui Xiang,Guowen Song,Jun Li 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11

The breathable fabric and membrane application in protective clothing designed for protection against flame,radiation, hot liquid and steam are vital in thermal protective performance and thermal comfort. Four kinds of laminatedmembrane-fabrics were selected to investigate the influence of configuration and properties of the fabric on thermalprotective performance under a pressurized steam hazard simulation. Surface morphology, water repellency, air permeability,water vapor permeability and other characteristics were evaluated to explore their impact on the mechanism of heat andmoisture transfer in laminated fabric. It is found that the configuration critically affects the thermal protective performance. The thickness, mass and moisture regain of laminated fabric exhibit different levels of positive correlation with thermalprotective performance of two configurations. Additionally, absorptive and porous membranes have different modes of watervapor transmission, while heat conduction and steam condensation in two kinds of membranes are both key influential factorsin producing skin burn under steam hazard. Therefore, effective protection against steam hazard is achieved by decreasing thepenetration and storage of steam within protective clothing.

Calculation of the Allowable Drainage of Parallel Tunnels Based on Ecological Environment Protection

Helin Fu,Pengtao An,Guowen Cheng,Shujie Wen,Jie Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5

To determine a reasonable value of parallel tunnel drainage, a steady-flow calculation model is established. The differential equilibrium equation of seepage is established, and the equation of the falling funnel curve in a steady state with drainage parameters is solved by using boundary conditions. The maximum drawdown depth of the control point is used to calculate the allowable discharge of the tunnel. Then, the curve equation of the falling funnel is determined, the volume of the drainage funnel is calculated, and the total discharge in the steady state is calculated according to the water storage coefficient. Finally, the theoretical formula is verified based on an engineering case and numerical simulation. Considering the actual engineering geology and hydrogeological conditions of the tunnel site, the total drainage, allowable drainage, and initial support bearing head height calculated with the proposed method are different from the actual measurements collected on site by 10%, 18.9% and 13.6%, respectively. Therefore, the calculation method can provide a reference for similar engineering.

A Strength Criterion for Deep Rock with Stochastic Fractures via DEM Simulations

Mingjing Jiang,Asen Liu,Huaning Wang,Guowen Lu,Lei Li 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2

Criteria for rock strength mostly focus on macromechanical parameters, which cannot directly explain the relationship between microscopic fracture characteristics and strength. This paper analyses the strength characteristics of deep jointed rock with stochastic fractures by the distinct element method (DEM) and proposes a new strength criterion. First, an improved bond contact model and the smooth-joint contact model are implemented within the framework of DEM to simulate the characteristics of deep rock. Then, triaxial compression tests on Berea sandstone are also numerically simulated under various confining pressures and fracture intensities (P32). Finally, a strength criterion is proposed and validated based on thenumerical and experimental results. The criterion can capture the nonlinear relationshipbetween the major principal stress and the confining pressure and reveal the microscopic fracture characteristics of deep rock. However, the criterion does not consider the influence of the intermediate principal stress. The average deviation between all the predicted strengths and the experimental results is 5.12%, which demonstrates that the criterion has good applicability.

Metabolic Characteristic of the Liver of Dairy Cows during Ketosis Based on Comparative Proteomics

Xu, Chuang,Wang, Zhe,Liu, Guowen,Li, Xiaobing,Xie, Guanghong,Xia, Cheng,Zhang, Hong You Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.7

The objective of the present study was to identify differences in the expression levels of liver proteins between healthy and ketotic cows, establish a liver metabolic interrelationship of ketosis and elucidate the metabolic characteristics of the liver during ketosis. Liver samples from 8 healthy multiparous Hostein cows and 8 ketotic cows were pooled by health status and the proteins were separated by two-dimensional-electrophoresis (2D-E). Statistical analysis of gels was performed using PDQuest software 8.0. The differences in the expression levels of liver proteins (p<0.05) between ketotic and healthy cows were identified by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF-TOF) tandem mass spectrometry. Five enzymes/proteins were identified as being differentially expressed in the livers of ketotic cows: expression of 3-hydroxyacyl-CoA dehydrogenase type-2 (HCDH), acetyl-coenzyme A acetyltransferase 2 (ACAT) and elongation factor Tu (EF-Tu) were down-regulated, whereas that of alpha-enolase and creatine kinase were up-regulated. On the basis of this evidence, it could be presumed that the decreased expression of HCDH, which is caused by high concentrations of acetyl-CoA in hepatic cells, in the livers of ketotic cows, implies reduced fatty acid ??oxidation. The resultant high concentrations of acetyl-CoA and acetoacetyl CoA would depress the level of ACAT and generate more ??hydroxybutyric acid; high concentrations of acetyl-CoA would also accelerate the Krebs Cycle and produce more ATP, which is stored as phosphocreatine, as a consequence of increased expression of creatine kinase. The low expression level of elongation factor Tu in the livers of ketotic cows indicates decreased levels of protein synthesis due to the limited availability of amino acids, because the most glucogenic amino acids sustain the glyconeogenesis pathway; thus increasing the level of alpha-enolase. Decreased protein synthesis also promotes the conversion of amino acids to oxaloacetate, which drives the Krebs Cycle under conditions of high levels of acetyl-CoA. It is concluded that the livers of ketotic cows possess high concentrations of acetyl-CoA, which through negative feedback inhibited fatty acid oxidation; show decreased fatty acid oxidation, ketogenesis and protein synthesis; and increased gluconeogenesis and energy production.

KCl flux-assisted CaTiO3: Pr3+ red phosphors for temperature sensing

Xin Liu,Xiuying Tian,Huiyan Sheng,Changyan Ji,Zhi Huang,Jin Wen,Hongxia Peng,Ling Zhu,Jing Li,Ping Liu,Yangxi Peng,Guowen Li 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2

The red CaTiO3: Pr3+ phosphors were fabricated by employing a solid-state method using KCl flux, and investigated fortemperature sensing. There were no structural changes observed with increasing KCl concentration, and no impuritieswere detected. The obtained crystal structure was identified as an orthorhombic perovskite, belonging to space group ofPnma(62). The typical sample exhibited spherical particles (1-2 μm). The optical bandgap of the sample was measured to beapproximately 3.62 eV. Notably, when the KCl concentration reached 3%, the sample exhibited the highest photoluminescenceintensity, indicating excellent crystallization strength. They closely resembled the chromaticity coordinates of ideal red lightbased on CIE chromaticity diagram, and the color purity was determined to be 79.51%. Furthermore, the absolute sensitivity(Sa) was approximately as high as 0.148 K-1, while the relative sensitivity (Sr) reached approximately a high value of 6.57% K-1,which highlights the significant potential of optical thermometry.