Pore Diameter of Mesoporous Silica Modulates Oxidation of H₂O₂-Sensing Chromophore in a Porous Matrix

Leong, Jiayu,Seo, Yongbeom,Chu, Sang-Hyon,Park, Cheol,Jeon, Eun Je,Cho, Seung-Woo,Yang, Yi Yan,DiPietro, Luisa A.,Kim, Dong Hyun,Kong, Hyunjoon American Chemical Society 2018 Langmuir Vol.34 No.38

<P>Hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>) is an attractive chemical because of its bleaching properties in paper and pulp industry and as a disinfectant in the food, water, and medical industries. However, it is important to monitor the residual H<SUB>2</SUB>O<SUB>2</SUB> level after its usage and prevent any unintended health problems or chemical reactions. Most H<SUB>2</SUB>O<SUB>2</SUB> sensors often utilize fluorophores or electrical circuitry that requires an additional irradiation or a digital display. To this end, this study presents a 3,3′,5,5′-tetramethylbenzidine (TMB)/horseradish peroxidase (HRP)-loaded patch that alerts the presence of high H<SUB>2</SUB>O<SUB>2</SUB> levels by generating a visible blue color. We hypothesized that water-insoluble TMB immobilized within mesoporous silica particles of proper pore diameter and structure would act as a colorimetric indicator through the H<SUB>2</SUB>O<SUB>2</SUB>-mediated oxidation within a cross-linked patch. We examined this hypothesis by immobilizing TMB molecules in mesoporous silica particles with 2 and 7 nm diameter cylindrical pores as well as on nonporous silica particles. Then, we loaded these TMB-silica particles and HRP in a porous alginate patch via sequential in situ cross-linking reaction and lyophilization. In the presence of 25-5000 μM H<SUB>2</SUB>O<SUB>2</SUB>, which simulate H<SUB>2</SUB>O<SUB>2</SUB> concentrations found in residual disinfecting fluids, the patch loaded with TMB-mesoporous silica particles with 7 nm diameter pores generated a distinct blue color with varying intensities depending on the H<SUB>2</SUB>O<SUB>2</SUB> concentration. The design principles demonstrated in this study should be applicable to a broad array of sensors to be integrated into a moldable, three-dimensional matrix.</P> [FIG OMISSION]</BR>

Bridgman growth, luminescence and energy transfer studies of Tm3+ or/and Dy3+ co-doped Bi4Si3O12 crystal phosphor

Bobo Yang,Jiayue Xu,Jun Zou,Yan Zhang,Tian Tian,Yaoqing Chu,Meiling Wang 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6

Tm3+, Dy3+ and Tm3+/Dy3+ co-doped bismuth silicate (Bi4Si3O12, BSO) crystals were successfully grown by the modified verticalBridgeman method. The crystals have about 80% transmittance in the range from 320 nm to 650 nm except several obviouscharacteristic absorption peaks corresponding to transitions of 4f electrons of Tm3+ and Dy3+. The luminescence properties forwhite light emitting diode (w-LED) were investigated. Energy transfer from the Bi3+ ions to the Tm3+ and Dy3+ ions in Tm3+or/and Dy3+ co-doped Bi4Si3O12 crystal has been established by photoluminescence investigation upon UV excitation. Whenexcited by a proper UV-light, Tm3+ doped BSO crystal shows blue emission band centered at 460 nm ascribed to Tm3+ (1D2→ 3F4), Dy3+ doped BSO crystal shows blue band at 480 nm (4F9/2→ 6H15/2), yellow band at 574 nm (4F9/2→ 6H13/2) and red bandat 662 nm (4F9/2→ 6H11/2) of Dy3+ ions. A white light with chromaticity coordinate of x = 0.3298, y = 0.2905 by excitation of357 nm is achieved from Tm3+/Dy3+ co-doped Bi4Si3O12 crystal. These results indicate that Tm3+/Dy3+ co-doped Bi4Si3O12 as awhite emitting crystal has a potential application in white-LED.

A Novel Gate Driver for Suppressing Overcurrent and Overvoltage of SiC MOSFET

Jiangui Chen,Yan Li,Mei Liang,R.Kennel,Jiayu Liu,Haobo Guo 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

SiC MOSFET has faster switching speed, lower RDS(on), and higher breakdown voltage when compared with Si MOSFET. Therefore, SiC MOSFET can work at work at higher frequencies, even Mhz. However, the overvoltage and overcurrent (OVOC) of SiC MOSFET become more serious with the increase of frequency due to the low damping and the parasitic parameters in the actual circuit. The causes of overcurrent and overvoltage of SiC MOSFET are analyzed in this paper, and a gate driver with the variable gate resistance and the variable driving voltage and is proposed to suppress OVOC of SiC MOSFET. This paper analyzes the working mode of the proposed gate driver (PGD).The PGD can effectively suppress the OVOC of SiC MOSFET. Finally, the effectiveness of the PGD is verified based on a doublepulse test platform.

Thiol-ene Click Chemistry Construct Superhydrophobic Cotton Fabric for High-efficiency Water-in-oil Emulsion Separation

Guihua Meng,Jiayu Yan,Jianning Wu,Weifang Zhang,Yixi Wang,Qian Wang,Zhiyong Liu,Xuhong Guo 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2

Water pollution severely effects human health and ecosystems. This paper presents a simple method of superhydrophobic cotton fabric fabrication for oil/water separation, We implemented thiol-ene reaction using 3-(Trimethoxysilyl)propyl methacrylate (TMSPMA) and n-dodecyl mercaptan (NDM). to synthesize low surface energy hydrophobic modifier. Superhydrophobic cotton fabrics demonstrated excellent superhydrophobicity, which makes them outstanding materials for continuous and simultaneous removal of insoluble and emulsified oils. Chemical composition, morphology, and hydrophobicity of these cotton fabrics were confirmed by FTIR spectra, scanning electron microscopy (SEM), and water contact angle measurements, respectively. Fabrics samples maintained their superhydrophobic propertieseven after 20 cycles, separation efficiency was still above 98.5 %. Our superhydrophobic cotton fabric demonstrated a remarkable separation of emulsified oil. We believe that our quick and environmentally friendly method can be used in variety of applications involving water-in-oil emulsion separation and oil purification.

A Study on the Factors that Influence Wearable Users' Quantified Self Based on UTAUT Model

Hong Jin,Jiayue Yan ASCONS 2020 INTERNATIONAL JOURNAL OF EMERGING MULTIDISCIPLINAR Vol.4 No.2

The integrated development of artificial intelligence and wearable technology provides technical conditions for users to participate in quantifying themselves. However, in the current, the research on wearable devices and other technical products is very lacking. Based on the existing user acceptance model, this paper proposes a quantitative self-acceptance model for wearable device users, and puts forward relevant assumptions and provide advice on the development of wearable technology

Left Ventricular Remodeling in Patients with Primary Aldosteronism: A Prospective Cardiac Magnetic Resonance Imaging Study

Wu Tao,Ren Yan,Wang Wei,Cheng Wei,Zhou Fangli,He Shuai,Liu Xiumin,Li Lei,Tang Lu,Deng Qiao,Zhou Xiaoyue,Chen Yucheng,Sun Jiayu 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.10

Objective: This study used cardiac magnetic resonance imaging (MRI) to compare the characteristics of left ventricular remodeling in patients with primary aldosteronism (PA) with those of patients with essential hypertension (EH) and healthy controls (HCs). Materials and Methods: This prospective study enrolled 35 patients with PA, in addition to 35 age- and sex-matched patients with EH, and 35 age- and sex-matched HCs, all of whom underwent comprehensive clinical and cardiac MRI examinations. The analysis of variance was used to detect the differences in the characteristics of left ventricular remodeling among the three groups. Univariable and multivariable linear regression analyses were used to determine the relationships between left ventricular remodeling and the physiological variables. Results: The left ventricular end-diastolic volume index (EDVi) (mean ± standard deviation [SD]: 85.1 ± 13.0 mL/m2 for PA, 75.9 ± 14.3 mL/m2 for EH, and 77.3 ± 12.8 mL/m2 for HC; p = 0.010), left ventricular end-systolic volume index (ESVi) (mean ± SD: 35.2 ± 9.8 mL/m2 for PA, 30.7 ± 8.1 mL/m2 for EH, and 29.5 ± 7.0 mL/m2 for HC; p = 0.013), left ventricular mass index (mean ± SD: 65.8 ± 16.5 g/m2 for PA, 56.9 ± 12.1 g/m2 for EH, and 44.1 ± 8.9 g/m2 for HC; p < 0.001), and native T1 (mean ± SD: 1224 ± 39 ms for PA, 1201 ± 47 ms for EH, and 1200 ± 44 ms for HC; p = 0.041) values were higher in the PA group compared to the EH and HC groups. Multivariable linear regression demonstrated that log (plasma aldosteroneto- renin ratio) was independently correlated with EDVi and ESVi. Plasma aldosterone was independently correlated with native T1. Conclusion: Patients with PA showed a greater degree of ventricular hypertrophy and enlargement, as well as myocardial fibrosis, compared to those with EH. Cardiac MRI T1 mapping can detect left ventricular myocardial fibrosis in patients with PA.

Enhanced plasma mineralization of adsorbed toluene by optimization the hybrid support of Ag–Mn catalysts

Caihong Qin,Wenwen Bai,Pin Liu,Jiayu Huang,Hui Guo,Xuemin Huang,Xiaoqing Dang,Dongjie Yan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-

The removal of toluene using a cycling adsorption and plasma mineralization process was investigated ina packed reactor. The supports of catalysts were optimized in regards to mineralization rate (MR), CO2selectivity (SCO2), and the production of by-products. The hybrid support g-Al2O3-HY showed a muchbetter MR in comparison to that of HY alone. Using hybrid HY-g-Al2O3 as supports, loading Ag–Mn ononly HY or g-Al2O3 had a better MR than loading Ag–Mn on both HY and g-Al2O3. The stability studyshowed that intermediates accumulated on the surface of the catalyst lead to its deterioration.

Heavy metal chemical extraction from industrial and municipal mixed sludge by ultrasound-assisted citric acid

Xuejiang Wang,Jie Chen,Xiangbo Yan,Xin Wang,Jing Zhang,Jiayu Huang,Jian-FuZhao 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-

Citric acid chemical extraction technology in combination with ultrasonication was used to removeheavy metals from industrial and municipal mixed sludge. The removal efficiencies of Zn, Ni, Cr and Cureached 53.5%, 40.2%, 35.4% and 13.1%, respectively, at citric acid concentration of 0.2 M assisted byultrasound for 20 min. The extracted Zn, Ni and Cr mainly came from acid-soluble, reducible andoxidizable fractions, and Cu mainly came from oxidizable and reducible fractions. The presence of Fe3+,Al3+ and Ca2+ improved the extraction efficiency of Cu from the sludge significantly. The extracted sludgecould be used for soil amendment.

Identification of Plasma Biomarkers in Drug-Naïve Schizophrenia Using Targeted Metabolomics

Qiao Su,Fuyou Bi,Shu Yang,Huiming Yan,Xiaoxiao Sun,Jiayue Wang,Yuying Qiu,Meijuan Li,Shen Li,Jie Li 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.9

Objective Schizophrenia (SCZ) is a severe psychiatric disorder with unknown etiology and lacking specific biomarkers. Herein, we aimed to explore plasma biomarkers relevant to SCZ using targeted metabolomics. Methods Sixty drug-naïve SCZ patients and 36 healthy controls were recruited. Psychotic symptoms were assessed using the Positive and Negative Syndrome Scale. We analyzed the levels of 271 metabolites in plasma samples from all subjects using targeted metabolomics, and identified metabolites that differed significantly between the two groups. Then we evaluated the diagnostic power of the metabolites based on receiver operating characteristic curves, and explored metabolites associated with the psychotic symptoms in SCZ patients. Results Twenty-six metabolites showed significant differences between SCZ patients and healthy controls. Among them, 12 metabolites were phosphatidylcholines and cortisol, ceramide (d18:1/22:0), acetylcarnitine, and γ-aminobutyric acid, which could significantly distinguish SCZ from healthy controls with the area under the curve (AUC) above 0.7. Further, a panel consisting of the above 4 metabolites had an excellent performance with an AUC of 0.867. In SCZ patients, phosphatidylcholines were positively related with positive symptoms, and cholic acid was positively associated with negative symptoms. Conclusion Our study provides insights into the metabolite alterations associated with SCZ and potential biomarkers for its diagnosis and symptom severity assessment.

Removal of gaseous toluene by nonthermal plasma coupled with wet scrubber containing Fe2+

Chaochao Jiang,Caihong Qin,Mengke Guo,Jiayu Huang,Dongjie Yan,Xiaoqing Dang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-

A non-thermal plasma with a wet scrubber (NTP + WS) was used to degrade gaseous toluene. Comparedwith the NTP + WS/H2O system, the toluene and by-product ozone removal efficiencies were increased by10% and 85% in the NTP + WS/Fe2+ system, respectively. For 60 ppm toluene degradation, the maximummineralization rate (MR) of toluene (61%) was obtained, at the optimum Fe2+ concentration of 50 mg/L. During catalytic oxidation, the removal efficiency of toluene was limited by its solubility in WS systems. In addition, decreased Fe2+ concentration and accumulation of organics led to the system deactivation. The EPR and quenching experiments verified the presence and contribution of hydroxyl radicals (4.6%)and superoxide radicals (3.8%) to the removal efficiency of toluene. Based on the radicals and intermediatesdetected in the gas and liquid phases, a degradation mechanism for toluene in the NTP + WS/Fe2+system was proposed.