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Yang X, Tripathi R, Wang M, Lu W, Anifowose A, Tan C, Wang B. Toward "CO in a Pill": Silica-Immobilized Organic CO Prodrugs for Studying the Feasibility of Systemic Delivery of CO via In Situ Gastrointestinal CO Release. Mol Pharm 2023; 20:1850-1856. [PMID: 36802675 PMCID: PMC9997063 DOI: 10.1021/acs.molpharmaceut.2c01104] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Carbon monoxide (CO), an endogenous signaling molecule, is known to exert a range of pharmacological effects, including anti-inflammation, organ protection, and antimetastasis in various animal models. We have previously shown the ability of organic prodrugs to deliver CO systemically through oral administration. As part of our efforts for the further development of these prodrugs, we are interested in minimizing the potential negative impact of the "carrier" portion of the prodrug. Along this line, we have previously published our work on using benign "carriers" and physically trapping the "carrier" portion in the gastrointestinal (GI) tract. We herein report our feasibility studies on using immobilized organic CO prodrugs for oral CO delivery while minimizing systemic exposure to the prodrug and the "carrier portion." In doing so, we immobilize a CO prodrug to silica microparticles, which are generally recognized as safe by the US FDA and known to provide large surface areas for loading and water accessibility. The latter point is essential for the hydrophobicity-driven activation of the CO prodrug. Amidation-based conjugation with silica is shown to provide 0.2 mmol/g loading degree, effective prodrug activation in buffer with comparable kinetics as the parent prodrug, and stable tethering to prevent detachment. One representative silica conjugate, SICO-101, is shown to exhibit anti-inflammation activity in LPS-challenged RAW264.7 cells and to deliver CO systemically in mice through oral administration and GI CO release. We envision this strategy as a general approach for oral CO delivery to treat systemic and GI-specific inflammatory conditions.
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Affiliation(s)
- Xiaoxiao Yang
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Ravi Tripathi
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Minjia Wang
- Department of Pharmaceutics and Drug Delivery, University of Mississippi School of Pharmacy, University, Mississippi 38677, United States
| | - Wen Lu
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Abiodun Anifowose
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Chalet Tan
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, Tennessee 38613, United States
| | - Binghe Wang
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
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JIANG X, WAN D, ZHENG F, XIE Y. Ionization Equilibrium of Water Molecule Dominated Ethanol-water Binary Solution Self-assemble. ELECTROCHEMISTRY 2022. [DOI: 10.5796/electrochemistry.22-00054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Xinyue JIANG
- School of Civil Engineering Architecture and Environment, Hubei University of Technology
| | - Duanji WAN
- School of Civil Engineering Architecture and Environment, Hubei University of Technology
| | - Fuping ZHENG
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University
| | - Yuqun XIE
- School of Bioengineering and Food Science, Hubei University of Technology
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Belogorlov AA, Borman VD, Khlistunov IA, Tronin VN, Neimark AV. Suspensions of lyophobic nanoporous particles as smart materials for energy absorption. J Colloid Interface Sci 2021; 600:229-242. [PMID: 34022721 DOI: 10.1016/j.jcis.2021.04.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 04/25/2021] [Accepted: 04/26/2021] [Indexed: 11/25/2022]
Abstract
HYPOTHESIS Suspensions of nanoporous particles in non-wetting fluids (lyophobic nanoporous suspensions, LPNPS) are explored as energy absorbing materials for shock absorbers, bumpers, and energy storage. Upon application of pressure, the non-wetting fluid invades the pores transforming the impact energy into the interfacial energy that can be stored and released on demand. EXPERIMENTS Here, we present a comprehensive experimental study of the dynamics of LPNPS compression within a wide range of shock impact energy for three types of mesoporous materials (Libersorb 23, Polysorb-1, and Silochrome-1.5) with water and Wood alloy as non-wetting fluids. FINDINGS Three different regimes of the LPNPS compression-expansion cycle in response to the shock impact are distinguished as the impact energy increases: without fluid penetration into the pores, with partial penetration, and with complete pore filling. In two latter regimes, the suspension compressibility in the process of rapid compression increases by 2-4 decimal decades. This giant effect is associated with the onset of penetration of the non-wetting fluid into the nanopores upon achievement of a certain threshold pressure. The dynamic threshold pressure exceeds the threshold pressure of quasistatic intrusion and does not depends on the impact pressure, temperature, and suspension composition. A dynamic model of suspension compression is suggested that allows to separate the effects of the fluid intrusion into the pores and the elastic deformation of the system.
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Affiliation(s)
- Anton A Belogorlov
- Polymeric Membranes Laboratory, A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospekt, 29, Moscow 119991, Russian Federation; Department of Molecular Physics, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh. 31, Moscow 115409, Russian Federation.
| | - Vladimir D Borman
- Polymeric Membranes Laboratory, A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospekt, 29, Moscow 119991, Russian Federation; Department of Molecular Physics, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh. 31, Moscow 115409, Russian Federation
| | - Igor A Khlistunov
- Polymeric Membranes Laboratory, A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospekt, 29, Moscow 119991, Russian Federation; Department of Molecular Physics, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh. 31, Moscow 115409, Russian Federation
| | - Vladimir N Tronin
- Department of Molecular Physics, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh. 31, Moscow 115409, Russian Federation
| | - Alexander V Neimark
- Department of Chemical and Biochemical Engineering, Rutgers University, Brett Road, 98, Piscataway NJ 08854, United States.
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Szczęsny R, Hoang TKA, Dobrzańska L, Gregory DH. Solution/Ammonolysis Syntheses of Unsupported and Silica-Supported Copper(I) Nitride Nanostructures from Oxidic Precursors. Molecules 2021; 26:4926. [PMID: 34443514 PMCID: PMC8402165 DOI: 10.3390/molecules26164926] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/07/2021] [Accepted: 08/11/2021] [Indexed: 11/16/2022] Open
Abstract
Herein we describe an alternative strategy to achieve the preparation of nanoscale Cu3N. Copper(II) oxide/hydroxide nanopowder precursors were successfully fabricated by solution methods. Ammonolysis of the oxidic precursors can be achieved essentially pseudomorphically to produce either unsupported or supported nanoparticles of the nitride. Hence, Cu3N particles with diverse morphologies were synthesized from oxygen-containing precursors in two-step processes combining solvothermal and solid-gas ammonolysis stages. The single-phase hydroxochloride precursor, Cu2(OH)3Cl was prepared by solution-state synthesis from CuCl2·2H2O and urea, crystallising with the atacamite structure. Alternative precursors, CuO and Cu(OH)2, were obtained after subsequent treatment of Cu2(OH)3Cl with NaOH solution. Cu3N, in the form of micro- and nanorods, was the sole product formed from ammonolysis using either CuO or Cu(OH)2. Conversely, the ammonolysis of dicopper trihydroxide chloride resulted in two-phase mixtures of Cu3N and the monoamine, Cu(NH3)Cl under similar experimental conditions. Importantly, this pathway is applicable to afford composite materials by incorporating substrates or matrices that are resistant to ammoniation at relatively low temperatures (ca. 300 °C). We present preliminary evidence that Cu3N/SiO2 nanocomposites (up to ca. 5 wt.% Cu3N supported on SiO2) could be prepared from CuCl2·2H2O and urea starting materials following similar reaction steps. Evidence suggests that in this case Cu3N nanoparticles are confined within the porous SiO2 matrix.
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Affiliation(s)
- Robert Szczęsny
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK;
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland;
| | - Tuan K. A. Hoang
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK;
- Hydro-Québec Research Institute, Hydro-Québec, 1806, Boul. Lionel-Boulet, Varennes, QC J3X 1S1, Canada
| | - Liliana Dobrzańska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland;
| | - Duncan H. Gregory
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK;
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5
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Zhang Z, Liu F, Lin Y. Nanospheres self-assembled by hybrid oxide nanocrystal and their photoelectric properties. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2021.1954015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Zhenqian Zhang
- School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Changzhou University, Changzhou, People's Republic of China
| | - Fang Liu
- School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Changzhou University, Changzhou, People's Republic of China
| | - Yongzhou Lin
- School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Changzhou University, Changzhou, People's Republic of China
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6
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Jiang X, Xie Y, Wan D, Zheng F, Wang J. Simultaneously detecting ethyl carbamate and its precursors in rice wine based on a pH-responsive electrochemical impedance sensor. Anal Chim Acta 2020; 1126:124-132. [PMID: 32736716 DOI: 10.1016/j.aca.2020.05.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 05/27/2020] [Accepted: 05/29/2020] [Indexed: 11/30/2022]
Abstract
Intensive efforts have been made to diminish ethyl carbamate in fermentation products. The presented research demonstrated an approach to simultaneously detecting ethyl carbamate and its precursors including urea, citrulline and arginine with nano Mn(Ⅱ)O modified composite working electrode via electrochemical impedance spectroscopy. Adjusting sample solutions at certain pH value leads the differentiated priority of protonation from nitrogen group in the ethyl carbamate (EC) and its precursors. Molecular recognition was achieved through attractive electrostatic interaction due to the negatively charged Mn(Ⅱ)O nanocrystal on the working electrode surface in aqueous sample solutions. Deconvolution and principle component analysis were applied to differentiate the specific scanning frequency for each analyte. The detection limits of EC, citrulline, urea and arginine are 0.8 ng L-1, 1.57 ng L-1, 0.54 ng L-1 and 1.56 ng L-1, respectively. The developed electrochemical sensor provides a sensitive and selective approach superior to the current reported label-free methodologies and offering a solution for ethyl carbamates in real time process control.
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Affiliation(s)
- Xinyue Jiang
- School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Hubei, Wuhan, 430068, China
| | - Yuqun Xie
- School of Bioengineering and Food Science, Hubei University of Technology, Wuhan, Hubei, 430068, China; Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, 100048, China.
| | - Duanji Wan
- School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Hubei, Wuhan, 430068, China
| | - Fuping Zheng
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, 100048, China
| | - Jun Wang
- School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Hubei, Wuhan, 430068, China; College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China; Ministry of Education Key Laboratory for Ecology of Tropical Islands, College of Life Sciences, Hainan Normal University, Haikou, 571158, China.
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7
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Jiang X, Xie Y, Wan D, Chen M, Zheng F. GUITAR-enhanced facile discrimination of aged Chinese Baijiu using electrochemical impedance spectroscopy. Anal Chim Acta 2019; 1059:36-41. [DOI: 10.1016/j.aca.2019.01.050] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/07/2019] [Accepted: 01/24/2019] [Indexed: 01/09/2023]
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8
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Zhang Y, Dong B, Wang S, Zhao L, Wan L, Wang E. Mechanically robust, thermally stable, highly transparent superhydrophobic coating with low-temperature sol–gel process. RSC Adv 2017. [DOI: 10.1039/c7ra08578h] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The wetting behavior of transparent superhydrophobic surfaces has attracted much attention in our daily life as well as in engineering applications.
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Affiliation(s)
- Yanping Zhang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
- China
- Key Laboratory for the Green Preparation and Application of Functional Materials
- Ministry of Education
- Hubei Key Laboratory of Polymer Materials
| | - Binghai Dong
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
- China
- Key Laboratory for the Green Preparation and Application of Functional Materials
- Ministry of Education
- Hubei Key Laboratory of Polymer Materials
| | - Shimin Wang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
- China
- Key Laboratory for the Green Preparation and Application of Functional Materials
- Ministry of Education
- Hubei Key Laboratory of Polymer Materials
| | - Li Zhao
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
- China
- Key Laboratory for the Green Preparation and Application of Functional Materials
- Ministry of Education
- Hubei Key Laboratory of Polymer Materials
| | - Li Wan
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
- China
- Key Laboratory for the Green Preparation and Application of Functional Materials
- Ministry of Education
- Hubei Key Laboratory of Polymer Materials
| | - Erjing Wang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials
- China
- Key Laboratory for the Green Preparation and Application of Functional Materials
- Ministry of Education
- Hubei Key Laboratory of Polymer Materials
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9
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Arumugam A, Ponnusami V. Ethanol Production from Cashew Apple Juice Using ImmobilizedSaccharomyces cerevisiaeCells on Silica Gel Matrix Synthesized from Sugarcane Leaf Ash. CHEM ENG COMMUN 2015. [DOI: 10.1080/00986445.2013.867256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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10
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Alloul H, Roques-Carmes T, Hamieh T, Razafitianamaharavo A, Barres O, Toufaily J, Villiéras F. Effect of chemical modification on surface free energy components of Aerosil silica powders determined with capillary rise technique. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2013.06.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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DNA-templated Pd conductive metallic nanowires. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2011; 749:49-59. [PMID: 21674364 DOI: 10.1007/978-1-61779-142-0_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We here present a protocol for the metallization of DNA scaffolds by palladium. The method is based on the initial slow precipitation of palladium oxide onto DNA strands. A reduction step follows to create conductive metallic nanowires. The slow oxide precipitation approach enables the formation of thin and continuous coatings on the DNA strands with negligible parasitic metallization of the remaining substrate surface.
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12
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Saleh K, Lazghab M, Guigon P. Chemical hydrophobisation of silica-based porous particles with n-Octadecyltrichlorosilane (ODTCS) by a solventless process in a fluidised-bed reactor. POWDER TECHNOL 2009. [DOI: 10.1016/j.powtec.2008.04.088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Lazghab M, Saleh K, Guigon P. A new solventless process to hydrophobize silica powders in fluidized beds. AIChE J 2008. [DOI: 10.1002/aic.11436] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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15
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Chen G, Zhou S, Gu G, Wu L. Modification of colloidal silica on the mechanical properties of acrylic based polyurethane/silica composites. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.09.016] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Chang KC, Chen YK, Chen H. Fabrication of superhydrophobic silica-based surfaces with high transmittance by using polypropylene and tetraeyhoxysilane precursors. J Appl Polym Sci 2007. [DOI: 10.1002/app.27200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Preparation of superhydrophobic silica-based films by using polyethylene glycol and tetraethoxysilane. J Appl Polym Sci 2007. [DOI: 10.1002/app.26395] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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19
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Semenova MG, Belyakova LE, Polikarpov YN, Il'in MM, Istarova TA, Anokhina MS, Tsapkina EN. Thermodynamic Analysis of the Impact of the Surfactant−Protein Interactions on the Molecular Parameters and Surface Behavior of Food Proteins. Biomacromolecules 2005; 7:101-13. [PMID: 16398504 DOI: 10.1021/bm050455m] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper reports on the thermodynamics of the interactions between surfactants (anionic, CITREM, SSL; nonionic, PGE; zwitterionic, phospholipids) and food proteins (sodium caseinate, legumin) depending on the chemical structure and molecular state (individual molecules, micelles) of the surfactants and the molecular parameters (conformation, molar mass, charge) of the proteins under changes of pH in the range from 7.2 to 5.0 and temperature from 293 to 323 K. The marked effect of the protein-surfactant interactions on the molecular parameters (the weight-average molar mass, the gyration and hydrodynamic radii) and the thermodynamic affinity of the proteins for an aqueous medium were determined by a combination of static and dynamic laser light scattering. Thermodynamically justified schematic sketches of the molecular mechanisms of the complex formation between like-charged proteins and surfactants have been proposed. In response to the complex formation between the proteins and the surfactants, the more stable and fine foams have been detected generally.
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Affiliation(s)
- Maria G Semenova
- Institute of Biochemical Physics of Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia.
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Ihara H, Fukui M, Mimaki T, Shundo A, Dong W, Derakhshan M, Sakurai T, Takafuji M, Nagaoka S. Poly(4-vinylpyridine) as a reagent with silanol-masking effect for silica and its specific selectivity for PAHs and dinitropyrenes in a reversed phase. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.05.056] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Chen G, Zhou S, Gu G, Yang H, Wu L. Effects of surface properties of colloidal silica particles on redispersibility and properties of acrylic-based polyurethane/silica composites. J Colloid Interface Sci 2005; 281:339-50. [PMID: 15571689 DOI: 10.1016/j.jcis.2004.08.100] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Accepted: 08/12/2004] [Indexed: 10/26/2022]
Abstract
Nanosilica particles with different surface properties were designed and prepared using colloidal silica particles and four different qualitative silane coupling agents (SCA), namely methyltriethoxysilane (MTES), octyltriethoxysilane (OTES), vinyltriethoxysilane (VTES) and methacryloxypropyltrimethoxysilane (MATMS), and further applied in acrylic resins and corresponding polyurethane coats by in situ polymerization. It was found that different qualitative SCA molecules had very different impacts on the redispersibility of nanosilica particles, the adsorbed acrylic polyol molecules, the viscosities of acrylic polyol/silica hybrid resins, and the properties of acrylic-based polyurethane/silica composites.
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Affiliation(s)
- Guodong Chen
- Department of Materials Science, Advanced Coatings Research Center of China Educational Ministry, Fudan University, Shanghai 200433, People's Republic of China
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23
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Roldan PS, Alcântara IL, Rocha JC, Padilha CCF, Padilha PM. Determination of Copper, Iron, Nickel and Zinc in fuel kerosene by FAAS after adsorption and pre-concentration on 2-aminothiazole-modified silica gel. ECLÉTICA QUÍMICA 2004. [DOI: 10.1590/s0100-46702004000200005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Silica gel chemically modified with 2-Aminotiazole groups, abbreviated as SiAT, was used for preconcentration of copper, zinc, nickel and iron from kerosene, normally used as a engine fuel for airplanes. Surface characteristics and surface area of the silica gel were obtained before and after chemical modification using FT-IR, Kjeldhal and surface area analysis (B.E.T.). The retention and recovery of the analyte elements were studied by applying batch and column techniques. The experimental parameters, such as shaking time in batch technique, flow rate and concentration of the eluent (HCl- 0.25-2.00 mol L-1) and the amount of silica, on retention and elution, have been investigated. Detection limits of the method for copper, iron, nickel and zinc are 0.77, 2.92, 1.73 and 0.097 mg L-1, respectively. The sorption-desorption of the studied metal ions made possible the development of a preconcentration method for metal ions at trace level in kerosene using flame AAS for their quantification.
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24
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Belyakova LA, Varvarin AM, Lyashenko DY, Roik NV. Study of interaction of poly(1-vinyl-2-pyrrolidone) with a surface of highly dispersed amorphous silica. J Colloid Interface Sci 2003; 264:2-6. [PMID: 12885512 DOI: 10.1016/s0021-9797(03)00395-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Interaction of poly(1-vinyl-2-pyrrolidone) with the surface of highly dispersed silica and character of its thermal destruction were investigated by means of ad-desorption measurement, vibration and electron spectroscopy, and thermal gravimetric analysis with programmed heating. The correlation between the character of polymer keeping on the surface of silicon dioxide and its thermal decomposition was established.
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Affiliation(s)
- Lyudmila A Belyakova
- Institute of Surface Chemistry, National Academy of Sciences of Ukraine, General Naumov str. 17, 03680 Kiev, Ukraine.
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Abstract
A novel application of nanotechnology in the field of mechanical engineering, called colloidal damper (CD), is investigated. This device is complementary to the hydraulic damper (HD), having a cylinder-piston construction. Particularly for CD, the hydraulic oil is replaced by a colloidal suspension, which consists of a mesoporous matrix and a lyophobic fluid. In this work, the porous matrix is from silica gel modified by linear chains of n-alkylchlorosilanes and water is considered as an associated working fluid. A design solution from a practical point of view of the CD test rig and the measuring technique of the hysteresis are described. A brief review of the water physical properties relative to the CD concept is presented. Influence of the bonding density, length of the grafted molecule, pore diameter, and particle diameter on the CD hysteresis is investigated for distinctive types and mixtures of silica gels. Temperature variation during functioning is recorded and the CD cycle is interpreted from a thermodynamic standpoint. Variation of the CD dissipated energy and efficiency with pressure, water quantity, and relaxation time is illustrated. Experimental results are justified by the analysis of the water flow into the porous matrix, CD thermodynamics, and the mechanism of the energy dissipation. Our findings agree with the previously published data.
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Affiliation(s)
- C V Suciu
- Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Hyogo 657-8501, Japan.
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26
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Role of surface nature of functional silicas in adsorption of monocarboxylic and bile acids. J Colloid Interface Sci 2003. [DOI: 10.1016/s0021-9797(02)00093-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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27
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Garcia-Valls R, Hrdlicka A, Perutka J, Havel J, Deorkar N, Tavlarides L, Muñoz M, Valiente M. Separation of rare earth elements by high performance liquid chromatography using a covalent modified silica gel column. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(01)01044-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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