Nepenthes pitcher-inspired lubricant-infused slippery surface with superior anti-corrosion durability, hot water repellency and scratch resistance

Binbin Zhang,Weichen Xu,Qingjun Zhu,Fang Guan,Yimeng Zhang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-

Nepenthes pitcher-inspired slippery surface provides an alternative strategy to overcome the shortcomingsof the current superhydrophobic surfaces such as thermal–mechanical stability and functional durability. Herein, we fabricate a lubricant-infused slippery surface (LISS) through micro-nano structurebuilding, low surface energy molecular grafting and perfluoropolyethers (PFPE) lubricant oil infusion. The surface morphologies, chemical compositions, wettability, dynamic liquids movement, selfcleaning,anti-corrosion behavior, and thermal–mechanical stability were investigated and analyzed. The electrochemical impedance spectroscopy (EIS) results reveal that the fabricated LISS exhibitsenhanced Rct and |Z|0.01Hz values with 2 orders of magnitude higher even after 30 days immersion,demonstrating outstanding long-lasting anti-corrosion properties. Besides, the LISS also exhibits superiorcapacities of hot water repellency (90 C water droplets) and scratching resistance. We believe theseresults have significant implications for understanding the design and multi-functional applications ofbiomimetic liquid-infused slippery materials.

All-organic superhydrophobic coating with anti-corrosion, anti-icing capabilities and prospective marine atmospheric salt-deliquesce self-coalesce protective mechanism

Binbin Zhang,Mengying Qiao,Weichen Xu,Baorong Hou 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-

Water-repellent and interfacial non-wetting superhydrophobicity has great potential to addresscorrosion/icing-induced material-deterioration problems. Herein, an all-organic superhydrophobic coatingwas constructed using facile and substrate-independent spray-coating method based on PTFE andPDMS. FE-SEM, EDS, and XPS techniques were used to analyze the surface topographies and chemicalcompositions. The coating exhibits superior anti-fouling and self-cleaning properties against various liquidand solid contaminants due to the synergic effect of low surface energy and hierarchical structures. The EIS and potentiodynamic polarization results show improved charge transfer resistance (Rct), positiveshifted corrosion potential (Ecorr), and decreased corrosion current density (Icorr), implying significantlyenhanced anti-corrosion performance with 99.83 % inhibition efficiency. Besides, the delay rate of icefreezingtime of the coating is 232 % at 5C, 137 % at 10 C and 204 % at 15 C compared withuncoated Q235 substrate respectively. The ice adhesion strength of the coating accounts for only6.55 % at 5C, 7.03 % at 10 C and 9.35 % at 15 C than that of the bare Q235 carbon steel, demonstratingultra-low ice adhesion force and anti-icing capabilities. The hygroscopic and deliquesce behaviorsof NaCl salt particles reveal an intriguing salt-deliquescence self-coalescence phenomenon andprospective anti-corrosion mechanism for superhydrophobic materials in high-humidity marine atmosphericenvironments.

Genome Architecture and Its Roles in Human Copy Number Variation

Lu Chen,Feng Zhang,Weichen Zhou,Ling Zhang 한국유전체학회 2014 Genomics & informatics Vol.12 No.4

Besides single-nucleotide variants in the human genome, large-scale genomic variants, such as copy number variations(CNVs), are being increasingly discovered as a genetic source of human diversity and the pathogenic factors of diseases. Recent experimental findings have shed light on the links between different genome architectures and CNV mutagenesis. Inthis review, we summarize various genomic features and discuss their contributions to CNV formation. Genomic repeats,including both low-copy and high-copy repeats, play important roles in CNV instability, which was initially known as DNArecombination events. Furthermore, it has been found that human genomic repeats can also induce DNA replication errorsand consequently result in CNV mutations. Some recent studies showed that DNA replication timing, which reflects thehigh-order information of genomic organization, is involved in human CNV mutations. Our review highlights that genomearchitecture, from DNA sequence to high-order genomic organization, is an important molecular factor in CNV mutagenesis and human genomic instability.

Facile One-Pot Synthesis and Optical Properties of Quinary Wurtzite Cu3ZnInSnS6 Nanocrystals

Dehui Li,Chen Zhang,Yajie Zhang,Weichen Qi,Jinxiang Dong,Jing Yang,Zhidong Qiu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11

Nearly monodisperse bullet-like Cu3ZnInSnS6 (CZITS) nanocrystals with wurtzite structure were successfully synthesized through optimized noninjection method. The structure, composition, morphology and optical properties of CZITS nanocrystals were characterized by X-ray diffraction, energy dispersive spectrometry, transmission electron microscopy and UV-Vis–NIR absorption. Their suitable bandgap and photoresponsive behavior indicate a high potential application in the field of solar cells. The growth mechanism of the as-synthesized CZITS nanocrystals was preliminarily discussed. It was found that the formation of CZITS could be separated into two steps: nucleation of Cu7S4 and growth of the CZITS main body.

Genome Architecture and Its Roles in Human Copy Number Variation

Chen, Lu,Zhou, Weichen,Zhang, Ling,Zhang, Feng Korea Genome Organization 2014 Genomics & informatics Vol.12 No.4

Besides single-nucleotide variants in the human genome, large-scale genomic variants, such as copy number variations (CNVs), are being increasingly discovered as a genetic source of human diversity and the pathogenic factors of diseases. Recent experimental findings have shed light on the links between different genome architectures and CNV mutagenesis. In this review, we summarize various genomic features and discuss their contributions to CNV formation. Genomic repeats, including both low-copy and high-copy repeats, play important roles in CNV instability, which was initially known as DNA recombination events. Furthermore, it has been found that human genomic repeats can also induce DNA replication errors and consequently result in CNV mutations. Some recent studies showed that DNA replication timing, which reflects the high-order information of genomic organization, is involved in human CNV mutations. Our review highlights that genome architecture, from DNA sequence to high-order genomic organization, is an important molecular factor in CNV mutagenesis and human genomic instability.

3D Discrete Element Method Modelling of Tunnel Construction Impact on an Adjacent Tunnel

Lin Wu,Xiedong Zhang,Zhihua Zhang,Weichen Sun 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.2

Closely-spaced side-by-side mechanized twin tunnels are commonly used in urban metro transit systems. The aim of this paper was to investigate the influence of tunnel construction on an adjacent existing tunnel using the 3D discrete element method (DEM) and propose a new method to protect the existing tunnel. The first tunnel at the left side was initially included in the DEM model. The construction of the second adjacent tunnel at the right side was then modelled in phases. Displacement, stress variation, porosity variation, and coordination of surroundings of the first tunnel were investigated. The results showed that the excavation of the second tunnel had a great negative impact on the existing tunnel surroundings when the distance of twin tunnels was less than the diameter of the tunnel. The maximum horizontal displacement occurred at the angle of 45° and was equal to 103 mm. The influenced area of the existing tunnel is the surroundings between the tunnel crown and the spring line on the second tunnel side near the tunnel lining. The composite reinforcement method consists of pasted fiber reinforced plastic (FRP) sheet method and grouting in a specific area; thus, the structure safety and the normal operation of the existing tunnel nearby can be guaranteed. The protective method can give reference for similar project.

The joint effect of different concentration of Cd<SUP>2+</SUP> and ionic liquid on the growth of wheat seedlings

Zhonglin Chen,Qian Zhou,Feng Leng,Bing Dai,Xueyang Zhao,Weichen Zhang,Neng Liu,Wei Guan,Kui Liu 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.3

The joint effect of different concentrations (0.05-0.375 mmol/L) of Cd<SUP>2+</SUP> and various concentrations (50-400 mg/L) of [C3mim][OAc] on the growth and physiology of wheat seedlings were investigated. The toxicity of Cd<SUP>2+</SUP> could be significantly reduced by lower concentrations (50-200 mg/L) of [C3mim][OAc]. With higher concentration (≥ 300 mg/L) of [C3mim][OAc], the reduction became less, and compared to Cd<SUP>2+</SUP> stress only, the toxicity of 400 mg/L [C3mim][OAc] increased. As for different Cd<SUP>2+</SUP> concentrations, the optimal reduction depends on the balance between the exact concentration of Cd<SUP>2+</SUP> and [C3mim][OAc]: With low Cd<SUP>2+</SUP> concentration (0.05-0.250 mmol/L) requiring 50 mg/L [C3mim][OAc], it could reach a dynamic equilibrium, while high Cd<SUP>2+</SUP> concentration (0.375 mmol/L) requiring 100 mg/L [C3mim][OAc]. The growth and physiological indexes of wheat seedlings show a decrease in toxicity compared to the Cd alone treatment, when the dynamic equilibrium is reached. The concentration of Cd<SUP>2+</SUP> in leaf tissues showed that low concentration (50-200 mg/L) of [C3mim][OAc] can reduce the toxicity of Cd<SUP>2+</SUP> (0.05-0.375 mmol/L) by decreasing the level of Cd<SUP>2+</SUP> concentration in the tissues, whereas the higher concentration (≥ 300 mg/L) of [C3mim][OAc] can increase the concentration of Cd<SUP>2+</SUP>.

On solutions to some nonlinear difference and differential equations

Wei Chen,Pei-Chu Hu,Yingying Zhang 대한수학회 2016 대한수학회지 Vol.53 No.4

In this paper, we study entire solutions of some nonlinear difference equations and transcendental meromorphic solutons of some nonlinear differential equations. Our results generalize the results due to \cite{LK1}, \cite{ZX}.

Effect of bending stiffness on the in-plane free vibration characteristics of a cable network

Wei Chen,Zhuojie Zhang,Xiaoxia Zhen,Mingyang Li 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11

Stay cables of cable-stayed bridges are connected by cross-ties to form a cable network, or the slings of the same suspension points on a suspension bridge are connected by vibration absorbers to form a sling network. As a result, the cable network’s in-plane free vibration characteristics are different from independent, single cables. However, stay cables or slings have certain bending stiffnesses, which directly affect the cable network’s free vibration characteristics. Therefore, to clarify the real dynamic behavior of a cable network and to improve the accuracy of cable network measurements, a multi-node, cross-tied, multilayer beam analytical model that considers the bending stiffness is proposed. The system equilibrium equation is established and the free vibration frequencies and modes of the system are obtained by analytical algorithm. Then, numerical simulations and field experiments, are carried out to verify the analytical results. In addition, parameter analyses with different configurations are performed on a multilayer stay-cable network and on a double-layer sling network to study the influence of bending stiffness on the cable network’s free vibration characteristics with different parameters.

Supplementing Vitamin E to the Ration of Beef Cattle Increased the Utilization Efficiency of Dietary Nitrogen

Wei, Chen,Lin, Shixin,Wu, Jinlong,Zhao, Guangyong,Zhang, Tingting,Zheng, Wensi Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.3

The objectives of the trial were to investigate the effects of supplementing vitamin E (VE) on nutrient digestion, nitrogen (N) retention and plasma parameters of beef cattle in feedlot. Four growing Simmental bulls, fed with a total mixed ration composed of corn silage and concentrate mixture as basal ration, were used as the experimental animals. Four levels of VE product, i.e. 0, 150, 300, 600 mg/head/d (equivalent to 0, 75, 150, 300 IU VE/head/d), were supplemented to the basal ration (VE content 38 IU/kg dry matter) in a $4{\times}4$ Latin square design as experimental treatments I, II, III and IV, respectively. Each experimental period lasted 15 days, of which the first 12 days were for pretreatment and the last 3 days for sampling. The results showed that supplementing VE did not affect the nutrient digestibility (p>0.05) whereas decreased the urinary N excretion (p<0.01), increased the N retention (p<0.05) and tended to increase the microbial N supply estimated based on the total urinary purine derivatives (p = 0.057). Supplementing VE increased the plasma concentrations of VE, glucose and triglycerol (TG) (p<0.05) and tended to increase the plasma concentration of total protein (p = 0.096) whereas did not affect the plasma antioxidant indices and other parameters (p>0.05). It was concluded that supplementing VE up to 300 IU/head/d did not affect the nutrient digestibility whereas supplementing VE at 150 or 300 IU/head/d increased the N retention and the plasma concentrations of VE and TG (p<0.05) of beef cattle.