Synthesis of Water-Dispersible Single-Layer CoAl-Carbonate Layered Double Hydroxide

Li, Haiping,Tran, Thanh-Nhan,Lee, Byong-Jun,Zhang, Chunfei,Park, Jong-Deok,Kang, Tong-Hyun,Yu, Jong-Sung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.24

<P>Despite extensive study on single-layer layered double hydroxides (SL-LDHs) with NO3- counterions, SL-LDHs with CO32- counterions (CO32- SL-LDHs) have never been prepared before. Herein, a CoAl-CO32- SL-LDH which stays stable in water and powdery state is first synthesized using ethylene glycol as a reaction medium. The SL-LDH, with thickness of similar to 0.85 nm, is composed of one Co(Al)O-6 layer sandwiched between two CO32- layers. The SL-LDH powder shows high specific surface area (similar to 289 m(2)/g) and excellent electrocatalytic oxygen evolution efficiency. This work provides the first simple way to prepare CO32- SL-LDHs and will open an avenue for synthesizing other SL-LDHs.</P>

Conjugated polyene-functionalized graphitic carbon nitride with enhanced photocatalytic water-splitting efficiency

Li, Haiping,Lee, Ha-Young,Park, Gi-Sang,Lee, Byong-June,Park, Jong-Deok,Shin, Cheol-Hwan,Hou, Wanguo,Yu, Jong-Sung Elsevier 2018 Carbon Vol.129 No.-

<P><B>Abstract</B></P> <P>Photoactivity of graphitic carbon nitride (g-C<SUB>3</SUB>N<SUB>4</SUB>) is seriously restricted by high recombination rate of photoinduced charge carriers. Herein, a g-C<SUB>3</SUB>N<SUB>4</SUB>/conjugated polyene (CP) complex is synthesized for the first time via a simple low-temperature calcination process. Lower photoluminescence intensity, longer fluorescence lifetimes, and higher photocurrent density of this complex than those of pure g-C<SUB>3</SUB>N<SUB>4</SUB> indicate that CP works effectively as electron acceptors and quickly shuttles electrons through its high conductive network to decrease the recombination rate of photogenerated electrons and holes of g-C<SUB>3</SUB>N<SUB>4</SUB> and improve the photocatalytic hydrogen production rate from 810 to 1270 <I>μ</I>mol/g/h under visible light irradiation. The complex prepared by calcination at 340 °C exhibits better photoactivity than those at 240 and 400 °C. Hydrogen bonds between g-C<SUB>3</SUB>N<SUB>4</SUB> and CP not only help to transfer electrons, but also fix CP molecules firmly on the surfaces of g-C<SUB>3</SUB>N<SUB>4</SUB>. This complex shows an excellent physicochemical stability in the photocatalytic process as well. This work provides not only a novel cost-effective way towards the preparation of new efficient gC<SUB>3</SUB>N<SUB>4</SUB> based complexes with better photoactivity, but also a new modification route to other photocatalysts for enhanced photocatalytic hydrogen production.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Effect of ultrahigh pressure processing (UHP) on physicochemical properties, antioxidant activity and anti-inflammatory activity of insoluble dietary fiber from Pholiota nameko

Haiping Li,Xinqi Guo,Xun Zhu,Yina Chen,Limin Zhang,Jiaqi Lu,Qiuting Qian 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.2

The aim of this study was to evaluate the effect of ultrahigh pressure processing (UHP) of 200, 300, 400, 500, 600 and 700 MPa for 20, 40 and 30 min on physicochemical and bioactive properties of the insoluble dietary fiber Pholiota nameko (PN-IDF). The results revealed that UHP were capable of decreasing the particle size of PN-IDF and binding phenolic content. Moreover, UHP technique had an improving effect on the bioaccessible phenolic content, the water-holding capacity, the oil-holding capacity and the nitrite ion adsorption capacity. Further, UHP technique presented a promoting effect on the antioxidant activity by scavenging ABTS or DPPH free radicals and increasing reducing power, and the anti-inflammatory activity by inhibiting carrageenan-induced paw edema on PN-IDF. Overall, this study well proved that UHP technology could improve the physicochemical and functional quality of PN-IDF, which could be used as a promising green technique for functional food ingredients processing.

LncSNHG3 promotes hepatocellular carcinoma epithelial mesenchymal transition progression through the miR-152-3p/JAK1 pathway

Li Hong,Wu Yu,Wang Runmei,Guo Junmei,Yu Qin,Zhang Lihe,Zhao Haiping,Yang Hao 한국유전학회 2022 Genes & Genomics Vol.44 No.1

Background: The dysregulation of LncRNAs is related to the malignant progression of many cancers. Objective: The study aimed to investigate the expression and the biological role of LncSNHG3 in hepatocellular carcinoma (HCC). Methods: The TCGA data of the LncSNHG3 in HCC were analyzed. The expression in HCC cell lines was detected by qRT-PCR. Proliferation, migration, and invasion of HepG2 and Huh7 were examined by cell counting kit-8, colony formation, transwell assays, and wound healing assays. At the same time, the interactions among LncSNHG3, miR-152-3p, and JAK1 were confirmed by dual-luciferase reporter assay, RNA immunoprecipitation, subcellular distribution. Xenograft tumor-bearing mice models were used to measure the effect of LncSNHG3 on the growth of HCC in vivo. The apoptosis and epithelial mesenchymal transition (EMT)-associated proteins were checked by WB and IHC. Results: LncSNHG3 was overexpressed in HCC tissues and cell lines. In addition, it is correlated with the tumor stage and survival time of HCC patients. Down-regulated LncSNHG3 could significantly suppress the EMT progression of HCC in vivo and in vitro. LncSNHG3 could promote the JAK1 expression by sponging miR-152-3p. Conclusions: LncSNHG3 acted as an oncogene and promoted the EMT procession in HCC by binding miR-152-3p and promoting JAK1 expression. Predictably, LncSNHG3 was used as a potential marker and will be used as a novel therapy target for HCC in the future.

Ciphertext-Policy Attribute-Based Encryption with Hidden Access Policy and Testing

( Jiguo Li ),( Haiping Wang ),( Yichen Zhang ),( Jian Shen ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.7

In ciphertext-policy attribute-based encryption (CP-ABE) scheme, a user`s secret key is associated with a set of attributes, and the ciphertext is associated with an access policy. The user can decrypt the ciphertext if and only if the attribute set of his secret key satisfies the access policy specified in the ciphertext. In the present schemes, access policy is sent to the decryptor along with the ciphertext, which means that the privacy of the encryptor is revealed. In order to solve such problem, we propose a CP-ABE scheme with hidden access policy, which is able to preserve the privacy of the encryptor and decryptor. And what`s more in the present schemes, the users need to do excessive calculation for decryption to check whether their attributes match the access policy specified in the ciphertext or not, which makes the users do useless computation if the attributes don`t match the hidden access policy. In order to solve efficiency issue, our scheme adds a testing phase to avoid the unnecessary operation above before decryption. The computation cost for the testing phase is much less than the decryption computation so that the efficiency in our scheme is improved. Meanwhile, our new scheme is proved to be selectively secure against chosen-plaintext attack under DDH assumption.

Preparation and characterization of a porous silicate material from silica fume

Yinmin Zhang,Haiping Qi,Yaqiong Li,Yongfeng Zhang,Junmin Sun 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.12

A porous silicate material derived from silica fume was successfully prepared and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) spectroscopy, Thermogravimetry and Differential thermal gravity (TG-DTG), N2 adsorption and desorption isotherms, and scanning electron microscopy (SEM). Raw silica fume was analyzed by XRD, FT-IR and SEM. The analysis results of silica fume indicated that SiO2 in silica fume is mainly determined as amorphous state, and that the particles of raw silica fume exhibited characteristic spherical structure with a diameter of from 50 nm to 200 nm. The preparation of the porous silicate material involved two steps. The first step was the extraction of the SiO3 2− leachate from raw silica fume. The maximum value of SiO3 2− extraction yield was obtained under the following conditions: reaction temperature of 120 oC, reaction time of 120 min, NaOH concentration of 15%, and alkali to SiO2 molar ratio of 2. The second step was the preparation of the porous silicate material though the reaction of SiO3 2− leachate and Ca(OH)2 suspension liquid. The optimum preparation conditions were as follows: preparation temperature of 90 oC, preparation time of 1.5 h, Si/Ca molar ratio of 1 : 1, and stirring rate of 100 r/min. The BET surface area and pore size of the porous silicate material were 220.7m2·g−1 and 8.55 cm3/g, respectively. The porous silicate material presented an amorphous and unordered structure. The spectroscopic results indicated that the porous silicate material was mainly composed of Si, Ca, O, C, and Na, in the form of Ca2+, SiO3 2−, CO3 2− and Na+ ions, respectively, which agreed with the XRD, TG-DSC, and FT-IR data. The N2 adsorption-desorption isotherm mode indicates that the porous silicate material belonged to a typical mesoporous material. The porous silicate material presented efficiency for the removal of formaldehyde: it showed a formaldehyde adsorption capacity of 8.01mg/g for 140 min at 25 oC.

Analysis on Device Mechanism and Numerical Simulation of Composite Air Purification

Jianlong Liu,Peng Liu,Li Liu,Haiping Zhang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.12

To solve the technical problems existing in air purification, a multileveled air purification device is presented. And the new device consists of catalytic purifying technology, low-temperature plasma, nanoscaled titania and dual-band ultraviolet. To deeply take a research on performance of the composite purification device, the device has been numerically simulated, with CFD simulation technology, through employing gas phase turbulence model, porous medium model and stochastic particle trajectory model. Comparative analyses on pressure distribution of internal flow field, velocity distribution, particle motion state and mass concentration distribution are made under different wind speed. The most appropriate wind speed can provide better centrifugal effect and less pressure loss. So some rules of velocity, pressure distribution and the particulate mass concentration distribution at all levels after filtering in internal device are acquired. In the meanwhile, a comparison among different research results has been made, and it helps to prove the reliability of this method.

Identification and characterization of scirr1, a novel geneup-regulated after spinal cord injury

Tao Liu,Zhenlian Ma,Haiping Que,Xin Li,Yanli Ni,Shuqian Jing,Shaojun Liu 생화학분자생물학회 2007 Experimental and molecular medicine Vol.39 No.3

Spinal cord injury and regeneration involves trans-criptional activity of many genes, of which many remain unknown. Using the rat spinal cord full- transection model, bioinformatics, cloning, expres-sion assays, fusion proteins, and transfection techniques, we identified and characterized one such differentially expressed gene, termed scirr1 (spinal cord injury and/or regeneration related gene 1). Fourteen orthologs were found in 13 species from echinoderm to insect and human by Blast search of NCBI protein reference sequence database. However, no further information is available for these homo-logues. Using whole-mount in situ hybridization, mouse scirr1 mRNA was expressed temporally and spatially in accordance with the early development sequence of the central nervous system. In adult rat spinal cord, expression of scirr1 mRNA was localized to neurons of gray matter by in situ hybridization. Using immunohistochemistry, SCIRR1 protein was found to be up-regulated and expressed more highly in spinal cord neurons farther from the epicenter of injury. Although the precise function of SCIRR1 is unknown, its unique pattern of expression during CNS early development and up-regulation after spinal cord injury sugges t that SCIRR1 should be involved in the succeeding injury and/or repair processes of the injured spinal cord. Also, the typical F-box and leucine-rich repeat (LRR) architecture of substrate recruiting role in the pleiotropic ubiquitin/ proteasome pathway. All these make scirr1 a new interesting start to study the spinal cord injury and regeneration mechanism.

The Research on the Effects of Electrical Aging on Trap Distribution in Polyethylene Doped with Nanoparticies

Lijuan He,Shan Wang,Chao Zhu,Haiping Xie,Dawei Li,Chuntian Chen 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.5

Elastic Foundation Beam Solution of Tensile Flexible Retaining Wall

Xu Jianqiang,Xu Jiangbo,Yang Xiaohua,Yan Zhaobai,Li Haiping,Wang Huoming,Tan Ling,Fei Dongyang,Li Jianguo,Luo Yongzhen 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.2

The application of fl exible retaining walls in foundation pit engineering is gradually increasing. At present, many practical engineering problems need to be solved. This article takes a corrugated steel retaining wall with tensile reinforcement, for example, assuming that it is an elastic foundation beam model. A typical vertical thin layer unit is taken on the retaining wall for analysis. It uses the waveform integration method to calculate the moment of inertia, deriving the diff erential equation of fl exural deformation of corrugated steel retaining wall and establishing the theoretical formula for deformation of corrugated steel retaining wall under fi lling pressure behind the wall. Finally, a FLAC3D model was established to simulate the deformation of corrugated steel retaining walls in practical engineering, and the fi nal numerical simulation results were consistent with the theoretical formula. Thus, providing a theoretical basis for the deformation of such fl exible retaining structures.