The Experts below are selected from a list of 210 Experts worldwide ranked by ideXlab platform
Zulin Hua - One of the best experts on this subject based on the ideXlab platform.
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Aggregation of TiO2-Graphene nanocomposites in aqueous environment: Influence of environmental factors and UV irradiation.
The Science of the total environment, 2015Co-Authors: Zulin Hua, Xue Bai, Jianan Zhang, Tang Zhiqiang, Lu Liang, Yuqi LiuAbstract:Abstract The aggregation kinetics of TiO2–Graphene nanocomposites in aqueous solution affected by solution pH, salt types (NaCl, CaCl2) and concentrations of electrolytes, and stability induced by UV irradiation was investigated in this study. The zeta potentials and hydrodynamic diameter of the Nanoparticles were used as bases to assess the aggregation behavior, and stability of nanocomposites exposed to UV irradiation was expressed in terms of supernatant concentration. The aggregation of TiO2–Graphene Nanoparticles in aqueous media followed the colloidal theory. TiO2–Graphene Nanoparticles were significantly aggregated in the presence of a diavalent cation compared with monovalent cation because the former was more capable of effective charge screening and neutralization. The calculated Hamaker constant of the TiO2–Graphene nanocomposites in aqueous solution prepared in the lab was 2.31 × 10− 20 J. The stability of this composite Nanoparticles was between those of pure TiO2 and Graphene. A known intensity of UV irradiation was beneficial in the formation of TiO2–Graphene Nanoparticle aggregates. However, prolonged UV irradiation may stabilize the Nanoparticles. These results provided critical information about the colloidal properties of the new TiO2–Graphene nanocomposites and were useful in predicting the fate and transport of TiO2–Graphene nanocomposites in natural water environments.
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TiO2–Graphene Nanoparticle based electrochemical sensor for the bimodal-response detection of 4-chlorophenol
RSC Advances, 2014Co-Authors: Xue Bai, Xiaoyuan Zhang, Huang Xin, Zulin Hua, Wang Chaofan, Qin QinAbstract:An electrochemical sensor for the sensitive and convenient determination of 4-chlorophenol (4-Cp) was developed based on TiO2-modified Graphene Nanoparticle casting onto screen-printed carbon electrodes (TiO2–Graphene oxide (GO)/SPE). A facile hydrothermal method was performed to prepare the novel TiO2–GO Nanoparticles. Scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy were carried out to characterize in detail the formed TiO2–GO Nanoparticles. TiO2 was homogenously deposited on the Graphene substrate, and the Nanoparticles possessed high surface areas and fast electron transfer rates, which could greatly improve their electrocatalytic performance. Cyclic voltammetry was performed to evaluate the electrochemical properties of TiO2–GO/SPE toward 4-Cp, and the TiO2–GO film exhibited a distinctly higher activity for bimodal-response detection of 4-Cp than the GO film. At the selected experimental conditions, the oxidation peak currents were proportional to 4-Cp concentrations over the range of 0.05 μM to 20.0 μM and 20.0 μM to 200.0 μM. The lower limit of detection was 0.02 μM. The obtained results suggested that the developed sensor can be successfully used to determine 4-Cp in a concentration range within environmental levels.
Xue Bai - One of the best experts on this subject based on the ideXlab platform.
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Aggregation of TiO2-Graphene nanocomposites in aqueous environment: Influence of environmental factors and UV irradiation.
The Science of the total environment, 2015Co-Authors: Zulin Hua, Xue Bai, Jianan Zhang, Tang Zhiqiang, Lu Liang, Yuqi LiuAbstract:Abstract The aggregation kinetics of TiO2–Graphene nanocomposites in aqueous solution affected by solution pH, salt types (NaCl, CaCl2) and concentrations of electrolytes, and stability induced by UV irradiation was investigated in this study. The zeta potentials and hydrodynamic diameter of the Nanoparticles were used as bases to assess the aggregation behavior, and stability of nanocomposites exposed to UV irradiation was expressed in terms of supernatant concentration. The aggregation of TiO2–Graphene Nanoparticles in aqueous media followed the colloidal theory. TiO2–Graphene Nanoparticles were significantly aggregated in the presence of a diavalent cation compared with monovalent cation because the former was more capable of effective charge screening and neutralization. The calculated Hamaker constant of the TiO2–Graphene nanocomposites in aqueous solution prepared in the lab was 2.31 × 10− 20 J. The stability of this composite Nanoparticles was between those of pure TiO2 and Graphene. A known intensity of UV irradiation was beneficial in the formation of TiO2–Graphene Nanoparticle aggregates. However, prolonged UV irradiation may stabilize the Nanoparticles. These results provided critical information about the colloidal properties of the new TiO2–Graphene nanocomposites and were useful in predicting the fate and transport of TiO2–Graphene nanocomposites in natural water environments.
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TiO2–Graphene Nanoparticle based electrochemical sensor for the bimodal-response detection of 4-chlorophenol
RSC Advances, 2014Co-Authors: Xue Bai, Xiaoyuan Zhang, Huang Xin, Zulin Hua, Wang Chaofan, Qin QinAbstract:An electrochemical sensor for the sensitive and convenient determination of 4-chlorophenol (4-Cp) was developed based on TiO2-modified Graphene Nanoparticle casting onto screen-printed carbon electrodes (TiO2–Graphene oxide (GO)/SPE). A facile hydrothermal method was performed to prepare the novel TiO2–GO Nanoparticles. Scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy were carried out to characterize in detail the formed TiO2–GO Nanoparticles. TiO2 was homogenously deposited on the Graphene substrate, and the Nanoparticles possessed high surface areas and fast electron transfer rates, which could greatly improve their electrocatalytic performance. Cyclic voltammetry was performed to evaluate the electrochemical properties of TiO2–GO/SPE toward 4-Cp, and the TiO2–GO film exhibited a distinctly higher activity for bimodal-response detection of 4-Cp than the GO film. At the selected experimental conditions, the oxidation peak currents were proportional to 4-Cp concentrations over the range of 0.05 μM to 20.0 μM and 20.0 μM to 200.0 μM. The lower limit of detection was 0.02 μM. The obtained results suggested that the developed sensor can be successfully used to determine 4-Cp in a concentration range within environmental levels.
Wasmiah Mohammed Dahan - One of the best experts on this subject based on the ideXlab platform.
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Polymer surfactant (Triton-100) assisted low cost method for preparing silver and Graphene oxide modified Bi-MnO_x nanocomposite for enhanced sensor and anti-microbial health care applications
Journal of Sol-Gel Science and Technology, 2021Co-Authors: Jothi Ramalingam Rajabathar, Prabhakarn Arunachalam, Hamad A. Al-lohedan, Radhika Thankappan, Jimmy Nelson Appaturi, Thiruchelvi Pulingam, Wasmiah Mohammed DahanAbstract:Silver Nanoparticles decorated on nanotubes morphology of Bismuth doped manganese oxide (Bi-MnOx) was prepared by Triton-X-100 polymer assisted precipitation process. In the second step, Ag Nanoparticle with very fine particle size and Graphene Nanoparticle deposition by high power ultra-sonication method. Biogenic route synthesized silver Nanoparticles have forms the spherical particle morphology with particle size obtained
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Polymer surfactant (Triton-100) assisted low cost method for preparing silver and Graphene oxide modified Bi-MnO_x nanocomposite for enhanced sensor and anti-microbial health care applications
Journal of Sol-Gel Science and Technology, 2021Co-Authors: Jothi Ramalingam Rajabathar, Prabhakarn Arunachalam, Hamad A. Al-lohedan, Radhika Thankappan, Jimmy Nelson Appaturi, Thiruchelvi Pulingam, Wasmiah Mohammed DahanAbstract:Silver Nanoparticles with quantum dot particles are produced by the biogenic route. Ag QDs incorporated on Bi- MnOx nanotubes show effective porous texture. Ag QD and GO are inserted into the tubular morphology of Bi-MnOx. Ag@Bi-MnOx and Bi-MnOx show effective antibacterial activity. Ag@Bi-MnOx and Ag-Bi-MnOx/GO show promising sensor activity. Silver Nanoparticles decorated on nanotubes morphology of Bismuth doped manganese oxide (Bi-MnOx) was prepared by Triton-X-100 polymer assisted precipitation process. In the second step, Ag Nanoparticle with very fine particle size and Graphene Nanoparticle deposition by high power ultra-sonication method. Biogenic route synthesized silver Nanoparticles have forms the spherical particle morphology with particle size obtained
Yuqi Liu - One of the best experts on this subject based on the ideXlab platform.
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Aggregation of TiO2-Graphene nanocomposites in aqueous environment: Influence of environmental factors and UV irradiation.
The Science of the total environment, 2015Co-Authors: Zulin Hua, Xue Bai, Jianan Zhang, Tang Zhiqiang, Lu Liang, Yuqi LiuAbstract:Abstract The aggregation kinetics of TiO2–Graphene nanocomposites in aqueous solution affected by solution pH, salt types (NaCl, CaCl2) and concentrations of electrolytes, and stability induced by UV irradiation was investigated in this study. The zeta potentials and hydrodynamic diameter of the Nanoparticles were used as bases to assess the aggregation behavior, and stability of nanocomposites exposed to UV irradiation was expressed in terms of supernatant concentration. The aggregation of TiO2–Graphene Nanoparticles in aqueous media followed the colloidal theory. TiO2–Graphene Nanoparticles were significantly aggregated in the presence of a diavalent cation compared with monovalent cation because the former was more capable of effective charge screening and neutralization. The calculated Hamaker constant of the TiO2–Graphene nanocomposites in aqueous solution prepared in the lab was 2.31 × 10− 20 J. The stability of this composite Nanoparticles was between those of pure TiO2 and Graphene. A known intensity of UV irradiation was beneficial in the formation of TiO2–Graphene Nanoparticle aggregates. However, prolonged UV irradiation may stabilize the Nanoparticles. These results provided critical information about the colloidal properties of the new TiO2–Graphene nanocomposites and were useful in predicting the fate and transport of TiO2–Graphene nanocomposites in natural water environments.
Shruti Kanakia - One of the best experts on this subject based on the ideXlab platform.
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dose ranging expanded acute toxicity and safety pharmacology studies for intravenously administered functionalized Graphene Nanoparticle formulations
Biomaterials, 2014Co-Authors: Shruti Kanakia, Jimmy Toussai, Sayan Mullick Chowdhury, Tanuf Tembulka, Yaping Jiang, Kenneth R Shroye, William Moore, Stephe Lee, Alaji SitharamaAbstract:Abstract Graphene Nanoparticle dispersions show immense potential as multifunctional agents for in vivo biomedical applications. Herein, we follow regulatory guidelines for pharmaceuticals that recommend safety pharmacology assessment at least 10 – 100 times higher than the projected therapeutic dose, and present comprehensive single dose response, expanded acute toxicology, toxicokinetics, and respiratory/cardiovascular safety pharmacology results for intravenously administered dextran-coated Graphene oxide nanoplatelet (GNP-Dex) formulations to rats at doses between 1 and 500 mg/kg. Our results indicate that the maximum tolerable dose (MTD) of GNP-Dex is between 50 mg/kg ≤ MTD
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Dose ranging, expanded acute toxicity and safety pharmacology studies for intravenously administered functionalized Graphene Nanoparticle formulations.
Biomaterials, 2014Co-Authors: Shruti Kanakia, Sayan Mullick Chowdhury, Yaping Jiang, William Moore, Jimmy Toussaint, Tanuf Tembulkar, Stephen Lee, Richard Z. Lin, Kenneth R. Shroyer, Balaji SitharamanAbstract:Graphene Nanoparticle dispersions show immense potential as multifunctional agents for in vivo biomedical applications. Herein, we follow regulatory guidelines for pharmaceuticals that recommend safety pharmacology assessment at least 10-100 times higher than the projected therapeutic dose, and present comprehensive single dose response, expanded acute toxicology, toxicokinetics, and respiratory/cardiovascular safety pharmacology results for intravenously administered dextran-coated Graphene oxide nanoplatelet (GNP-Dex) formulations to rats at doses between 1 and 500 mg/kg. Our results indicate that the maximum tolerable dose (MTD) of GNP-Dex is between 50 mg/kg ≤ MTD < 125 mg/kg, blood half-life < 30 min, and majority of Nanoparticles excreted within 24 h through feces. Histopathology changes were noted at ≥250 mg/kg in the heart, liver, lung, spleen, and kidney; we found no changes in the brain and no GNP-Dex related effects in the cardiovascular parameters or hematological factors (blood, lipid, and metabolic panels) at doses < 125 mg/kg. The results open avenues for pivotal preclinical single and repeat dose safety studies following good laboratory practices (GLP) as required by regulatory agencies for investigational new drug (IND) application.
