Synthesis of conducting polymeric nanoparticles in the presence of a polymerizable surfactant and their electrorheological response

Han, Wen Jiao,Choi, Hyoung Jin Springer 2019 Colloid and Polymer Science Vol.297 No.5

Core–shell structured mesoporous magnetic nanoparticles and their magnetorheological response

Han, Wen Jiao,Piao, Shang Hao,Choi, Hyoung Jin,Seo, Yongsok Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.524 No.-

<P><B>Abstract</B></P> <P>As a new magneto-responsive smart material, core–shell structured mesoporous Fe<SUB>3</SUB>O<SUB>4</SUB>@mSiO<SUB>2</SUB> nanoparticles were fabricated by a surfactant-based sol–gel approach using Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles, and then adopted as magnetorheological (MR) materials. The Fe<SUB>3</SUB>O<SUB>4</SUB> particles were initially synthesized by a solvo-thermal process. Scanning electron microscopy and transmission electron microscopy were employed to observe the morphology of the as-synthesized mesoporous silica-coated Fe<SUB>3</SUB>O<SUB>4</SUB> particles. Fourier transform infrared spectroscopy and X-ray diffraction results showed that the mesoporous silica shell is successfully coated on the Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles. BET adsorption measurement also confirmed their mesopore formation. Rheological properties of the silica-coated Fe<SUB>3</SUB>O<SUB>4</SUB>-based MR fluid dispersed in silicone oil were investigated, and a change in the slope of the yield stress as a function of magnetic field strength from 2.0 to 1.5 was observed, with improved dispersion stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Core–shell structured mesoporous Fe<SUB>3</SUB>O<SUB>4</SUB>@mSiO<SUB>2</SUB> nanoparticles were fabricated. </LI> <LI> Both dynamic and elastic yield stresses of MR fluids were well correlated with universal yield stress equation. </LI> <LI> Dispersion stability of MR fluid was improved compared to the sedimentation rate of Fe<SUB>3</SUB>O<SUB>4</SUB>-based MR fluid. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Synthesis and Viscoelastic Behavior of Non-Stoichiometric Spinel Ferrite Particle Suspension

Han, Jae Kyeong,Han, Wen Jiao,Gao, Chun Yan,Dong, Yu Zhen,Choi, Hyoung Jin IEEE 2018 IEEE transactions on magnetics Vol.54 No.11

<P>Magnetorheological (MR) fluid with tunable and reversible phase transition is one of the most promising smart materials for engineering applications. In this paper, to improve the MR performance of ferrites, non-stoichiometric Zn-doped spinel ferrite (Zn<SUB>0.417</SUB>Fe<SUB>2.583</SUB>O<SUB>4</SUB>) nanoparticles with a high saturation magnetization and a truncated octahedron-like shape were synthesized using a thermal decomposition process. The crystallographic structure was analyzed using X-ray diffraction and field emission transmission electron microscope image. The Zn<SUB>0.417</SUB>Fe<SUB>2.583</SUB>O<SUB>4</SUB> had a high saturation magnetization value of 101 <TEX>$\text {A}\cdot \text {m}^{2}$</TEX>/kg at 933 kA/m, showing higher saturation magnetization than other ferrites. The MR characteristics of the Zn<SUB>0.417</SUB>Fe<SUB>2.583</SUB>O<SUB>4</SUB> particles suspended in silicone oil were studied using a rotation rheometer under various magnetic field strengths. This MR fluid exhibited typical MR characteristics, and its flow curves were fit well with the Herschel–Bulkley model.</P>

Radix ranunculus temate saponins induces apoptosis via the death receptor and mitochondrial pathways in SGC-7901 cells

Mao-lin Li,Han-min Gu,Hong-ya Hang,Yao-li Jiang,Jiao Jiang,Qian-na Gu,Wen-yan Wu,M.-L. Li 대한독성 유전단백체 학회 2015 Molecular & cellular toxicology Vol.11 No.4

Radix ranunculus temate saponins (RRTS), one of the main constituents extracted from the popular traditional Chinese medicine Radix Ranunculi ternati, has been reported to have various biological activities including anti-cancer effect. The aim of this study is to investigate the effect of RRTS on the cell proliferation and apoptosis in human gastric adenocarcinoma SGC-7901 cells. The data showed that exposure to RRTS for 24 h produced cytotoxic effects on SGC- 7901 cells in a dose-dependent manner (with an IC50 value of 21.22±2.76 μg/mL), which was accompanied by apoptosis induction (from 2.18±0.89% (control) to 63.72±13.16% (100 μg/mL)). Both the extrinsic or death receptor pathway and the intrinsic or mitochondrial pathway were involved in RRTS-induced apoptosis in SGC-7901 cells. Furthermore, apoptotic signaling induced by RRTS was amplified by cross-link between the two pathways via the signal-integrating protein Bid. In conclusion, our findings contribute to better understanding the molecular mechanism of RRTS’ effect on gastric cancer cells and form the basis of the therapeutic development of RRTS in treating gastric cancer in the future.

Stimuli-Responsive Graphene Oxide-Polymer Nanocomposites

Qi Lu,장효선,Wen Jiao Han,이진현,최형진 한국고분자학회 2019 Macromolecular Research Vol.27 No.11

Graphene oxide (GO) attracts tremendous attention for application in high-performance stimuli-responsive “smart” materials because of its unique and excellent electrical, mechanical, thermal, and optical properties, high biocompatibility, and potential application in a variety of fields, including nanocomposite-based devices. Even at an extremely small loading, the chemical, physical, and mechanical properties of GO-polymer nanocomposites can be significantly changed due to its one-atom thickness and large surface area. Therefore, GO-based filler-containing polymer nanocomposites are sensitive to various external stimuli, such as electric and magnetic fields, pH, thermal or optical excitations, and stress. This article reviews the compositions, preparations, and characteristics of a variety of external stimuli-responsive nanocomposites containing GO and other graphene-based fillers. Particularly, the electrorheological and magnetorheological behaviors of smart fluids are described with well-known models and relationships. Finally, various applications of GO-polymer nanocomposites are briefly presented.

Additive effect of rod-like magnetite/sepiolite composite particles on magnetorheology

Yu Zhen Dong,Wen Jiao Han,최형진 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-

Rod-like magnetite/sepiolite nanocomposite particles were fabricated using a chemical co-precipitationprocess and introduced as an added ingredient in a carbonyl iron (CI)-based magnetorhologicalfluid(MRF). The morphologies of the composite particles and CI-magnetite/sepiolite mixture were observedby scanning electron microscopy. Two types of MRFs with and without magnetite/sepiolite additive werefabricated, and their MR behaviors and sedimentation stability were investigated using a rotationrheometer and an optical analyzer system of Turbiscan, respectively. The results showed that the additionof rod-like magnetite/sepiolite additives enhanced both the dispersion and MR properties of CI-basedMRF, making its potential application more promising.

Compound glycyrrhizin injection for improving liver function in children with acute icteric hepatitis: A systematic review and meta-analysis

Liang Shi-Bing,Hou Wen-Bin,Zheng Ruo-Xiang,Liang Chang-Hao,Yan Li-Jiao,Wang Hao-Nan,Cao Hui-Juan,Han Mei,Robinson Nicola,Liu Jian-Ping 한국한의학연구원 2022 Integrative Medicine Research Vol.11 No.1

Background: Compound glycyrrhizin injection (CGI) is a preparation with glycyrrhizin as the main active ingredient extracted from licorice. As clinical trials suggest that CGI is effective in improving liver function for acute icteric hepatitis in children (AIHC), this systematic review aimed to evaluate and verify its therapeutic effects and safety. Methods: Six electronic databases were searched from their inception to 15 May 2021. Randomized controlled trials (RCTs) assessing therapeutic effects and safety of CGI for AIHC were included. The risk of bias for each trial was assessed using the Cochrane Risk of Bias Tool 2.0. Primary outcomes were indexes related to liver function, including total bilirubin (TBiL), alanine aminotransferase (ALT) and aspartate transaminase (AST). RevMan 5.4 software was used for data analyses. The certainty of the evidence was assessed using the online GRADEpro tool. Results: Six RCTs involving 608 children were included. The overall bias was assessed as having “high risk of bias” in all trials. All trials compared the combination of CGI and conventional western medicine (CWM) with CWM alone. Regarding the effects of CGI for AIHC, results showed that CGI plus CWM was superior to CWM alone in reducing the levels of TBiL (mean difference (MD) = -8.19 mmol/L, 95% CI -9.86 to -6.53), ALT (MD = -24.09 U/L, 95% CI -30.83 to -17.34) and AST (MD = -18.67 U/L, 95% CI -21.88 to -15.45). No trial reported adverse events. The certainty of the evidence for outcomes were all evaluated as low or very low. Conclusion: CGI may have adjuvant therapeutic effects on improving the liver function of children with AIHC. There is no evidence to determine the safety of CGI for AIHC. As current evidence is weak, further well-designed RCTs are required for verification of the therapeutic effects of CGI. Background: Compound glycyrrhizin injection (CGI) is a preparation with glycyrrhizin as the main active ingredient extracted from licorice. As clinical trials suggest that CGI is effective in improving liver function for acute icteric hepatitis in children (AIHC), this systematic review aimed to evaluate and verify its therapeutic effects and safety. Methods: Six electronic databases were searched from their inception to 15 May 2021. Randomized controlled trials (RCTs) assessing therapeutic effects and safety of CGI for AIHC were included. The risk of bias for each trial was assessed using the Cochrane Risk of Bias Tool 2.0. Primary outcomes were indexes related to liver function, including total bilirubin (TBiL), alanine aminotransferase (ALT) and aspartate transaminase (AST). RevMan 5.4 software was used for data analyses. The certainty of the evidence was assessed using the online GRADEpro tool. Results: Six RCTs involving 608 children were included. The overall bias was assessed as having “high risk of bias” in all trials. All trials compared the combination of CGI and conventional western medicine (CWM) with CWM alone. Regarding the effects of CGI for AIHC, results showed that CGI plus CWM was superior to CWM alone in reducing the levels of TBiL (mean difference (MD) = -8.19 mmol/L, 95% CI -9.86 to -6.53), ALT (MD = -24.09 U/L, 95% CI -30.83 to -17.34) and AST (MD = -18.67 U/L, 95% CI -21.88 to -15.45). No trial reported adverse events. The certainty of the evidence for outcomes were all evaluated as low or very low. Conclusion: CGI may have adjuvant therapeutic effects on improving the liver function of children with AIHC. There is no evidence to determine the safety of CGI for AIHC. As current evidence is weak, further well-designed RCTs are required for verification of the therapeutic effects of CGI.

Streptomyces xinghaiensis sp. nov., isolated from marine sediment.

Zhao, Xin-Qing,Li, Wen-Jun,Jiao, Wen-Ce,Li, Yan,Yuan, Wen-Jie,Zhang, Yu-Qin,Klenk, Hans-Peter,Suh, Joo-Won,Bai, Feng-Wu Society for General Microbiology 2009 International journal of systematic and evolutiona Vol.59 No.11

<P>A novel actinomycete, strain S187(T), was isolated from a marine sediment sample collected from Xinghai Bay, Dalian, China. Growth occurred on ISP medium 2 containing 0-9 % NaCl and at pH 6.0-9.0 and 10-45 degrees C. The cell wall of strain S187(T) contained the isomer ll-diaminopimelic acid as the diagnostic diamino acid. The predominant menaquinones were MK-9(H(6)) (40.8 %), MK-9(H(8)) (38.2 %) and MK-9(H(2)) (8.8 %). The major fatty acids were iso-C(16 : 0) (29.6 %), anteiso-C(15 : 0) (14.0 %) and anteiso-C(17 : 0) (11.6 %). Cells contained phosphatidylethanolamine, phosphatidylinositol, phosphatidylglycerol, phosphatidylinositol mannosides and one unknown phospholipid. The G+C content of the genomic DNA was 72.01 mol%. The 16S rRNA gene sequence of the isolate had similarities of 98.1 and 97.5 % with those of Streptomyces flavofuscus NRRL B-8036(T) (=DSM 41426(T)) and Streptomyces albiaxialis DSM 41799(T), respectively, showing that the novel strain should be assigned to the genus Streptomyces. DNA-DNA hybridizations with the two above-mentioned Streptomyces species showed 31.4 and 46.9 % relatedness, respectively. Moreover, the three strains differed in some physiological and biochemical properties. Thus, on the basis of phenotypic and genotypic analyses, it is proposed that strain S187(T) represents a novel species of the genus Streptomyces, for which the name Streptomyces xinghaiensis sp. nov. is proposed; the type strain is S187(T) (=NRRL B-24674(T)=CCTCC AA 208049(T)=KCTC 19546(T)).</P>

Deuterium Clusters Fusion Induced by the Intense Femtosecond Laser Pulse

Hong-Jie, Liu,Zhi-Jian, Zheng,Yu-Qiu, Gu,Bao-Han, Zhang,Yong-Joo, Rhee,Sung-Mo, Nam,Jae-Min, Han,Yong-Woo, Rhee,Kwon-Hae, Yea,Jia-Bin, Chen,Hong-Bin, Wang,Chun-Ye, Jiao,Ying-Ling, He,Tian-Shu, Wen,Xia ALLERTON PRESS INC 2007 CHINESE PHYSICS LETTERS Vol.24 No.2

<P>Neutrons (2.45 MeV) from deuterium cluster fusion induced by the intense femtosecond (30 fs) laser pulse are experimentally demonstrated. The average neutron yield 10<SUP>3</SUP> per shot is obtained. It is found that the yield slightly increases with the increasing laser spot size. No neutron can be observed when the laser intensity I < 4.3×10<SUP>15</SUP> W/cm<SUP>2</SUP>.</P>