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Yagoub H, Zhu L, Shibraen MHMA, Xu X, Babiker DMD, Xu J, Yang S. Complex membrane of cellulose and chitin nanocrystals with cationic guar gum for oil/water separation. J Appl Polym Sci 2019. [DOI: 10.1002/app.47947] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Hajo Yagoub
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low‐Dimension MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 China
| | - Liping Zhu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low‐Dimension MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 China
| | | | - Xiaowei Xu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low‐Dimension MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 China
| | - Dafaalla M. D. Babiker
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low‐Dimension MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 China
| | - Jian Xu
- Laboratory of Polymer Physics and ChemistryInstitute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
| | - Shuguang Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low‐Dimension MaterialsCollege of Materials Science and Engineering, Donghua University Shanghai 201620 China
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Shaabani N, Jemere AB, Harrison DJ. Size-based proteins separation using polymer-entrapped colloidal self-assembled nanoparticles on-chip. Electrophoresis 2016; 37:2602-2609. [DOI: 10.1002/elps.201600224] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/23/2016] [Accepted: 07/12/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Narges Shaabani
- Department of Chemistry; University of Alberta; Edmonton AB Canada
| | - Abebaw B. Jemere
- National Institute for Nanotechnology; National Research Council Canada; Edmonton AB Canada
| | - D. Jed Harrison
- Department of Chemistry; University of Alberta; Edmonton AB Canada
- National Institute for Nanotechnology; National Research Council Canada; Edmonton AB Canada
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Yoon SS, Khang DY. Direct Visualization of Etching Trajectories in Metal-Assisted Chemical Etching of Si by the Chemical Oxidation of Porous Sidewalls. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10549-10554. [PMID: 26352208 DOI: 10.1021/acs.langmuir.5b02453] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We demonstrate a simple method for the visualization of trajectories traced by noble metal nanoparticles during metal-assisted chemical etching (MaCE) of Si. The nanoporous Si layer formed around drilled pores is converted into SiO2 by simple chemical oxidation. Etch removal of the remaining Si using alkali hydroxide leaves SiO2 nanostructures that are the exact replica of those drilled pores or etching trajectories. The differences in etching characteristics between Ag and Au have been investigated using the proposed visualization method. The shape and chemical stability of metal nanoparticles used for MaCE have been found to be critical in determining etching paths. The proposed method would be very helpful in studying the fundamental mechanism of MaCE as well as in micro/nanostructuring of the Si surface for various applications. This approach can also be used for the generation of straight or helical SiO2 nanotubes.
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Affiliation(s)
- Sung-Soo Yoon
- Department of Materials Science and Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea
| | - Dahl-Young Khang
- Department of Materials Science and Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea
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Aboelmagd A, El-Safty SA, Shenashen MA, Elshehy EA, Khairy M, Sakaic M, Yamaguchi H. Nanomembrane Canister Architectures for the Visualization and Filtration of Oxyanion Toxins with One-Step Processing. Chem Asian J 2015; 10:2467-78. [PMID: 26178184 DOI: 10.1002/asia.201500565] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Indexed: 01/12/2023]
Abstract
Nanomembrane canister-like architectures were fabricated by using hexagonal mesocylinder-shaped aluminosilica nanotubes (MNTs)-porous anodic alumina (PAA) hybrid nanochannels. The engineering pattern of the MNTs inside a 60 μm-long membrane channel enabled the creation of unique canister-like channel necks and cavities. The open-tubular canister architecture design provides controllable, reproducible, and one-step processing patterns of visual detection and rejection/permeation of oxyanion toxins such as selenite (SeO3(2-)) in aquatic environments (i.e., in ground and river water sources) in the Ibaraki Prefecture of Japan. The decoration of organic ligand moieties such as omega chrome black blue (OCG) into inorganic Al2O3@tubular SiO2/Al2O3 canister membrane channel cavities led to the fabrication of an optical nanomembrane sensor (ONS). The OCG ligand was not leached from the canister as observed in washing, sensing, and recovery assays of selenite anions in solution, which enabled its multiple reuse. The ONS makes a variety of alternate processing analyses of selective quantification, visual detection, rejection/permeation, and recovery of toxic selenite quick and simple without using complex instrumentation. Under optimal conditions, the ONS canister exhibited a high selectivity toward selenite anions relative to other ions and a low-level detection limit of 0.0093 μM. Real analytical data showed that approximately 96% of SeO3(2-) anions can be recovered from aquatic and wastewater samples. The ONS canister holds potential for field recovery applications of toxic selenite anions from water.
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Affiliation(s)
- Ahmed Aboelmagd
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Sherif A El-Safty
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan). , .,Graduate School for Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan). ,
| | - Mohamed A Shenashen
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Emad A Elshehy
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Mohamed Khairy
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
| | - Masaru Sakaic
- Centre for Research in Isotopes & Environmental Dynamics, Tsukuba University, 265-38 Shin Makita, Tsukuba-shi, Ibaraki, 305-0076, Japan
| | - Hitoshi Yamaguchi
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken, 305-0047, Japan)
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Derbalah A, El-Safty SA, Shenashen MA, Khairy M. Hierarchical Nanohexagon Ceramic Sheet Layers as Platform Adsorbents for Hydrophilic and Hydrophobic Insecticides from Agricultural Wastewater. Chempluschem 2015; 80:1769-1778. [DOI: 10.1002/cplu.201500244] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Aly Derbalah
- National Institute for Materials Science (NIMS); 1-2-1 Sengen Tsukubashi Ibaraki-ken 305-0047 Japan
- Pesticides Chemistry and Toxicology Department; Faculty of Agriculture; Kafr El-Sheikh University; Egypt
| | - Sherif A. El-Safty
- National Institute for Materials Science (NIMS); 1-2-1 Sengen Tsukubashi Ibaraki-ken 305-0047 Japan
- Graduate School for Advanced Science and Engineering; Waseda University; 3-4-1 Okubo Shinjuku-ku Tokyo 169-8555 Japan
| | - Mohamed A. Shenashen
- National Institute for Materials Science (NIMS); 1-2-1 Sengen Tsukubashi Ibaraki-ken 305-0047 Japan
| | - Mohamed Khairy
- National Institute for Materials Science (NIMS); 1-2-1 Sengen Tsukubashi Ibaraki-ken 305-0047 Japan
- Chemistry Department; Sohag University; Egypt
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El-Safty SA, Sakai M, Selim MM, Alhamid AA. Mesotubular-Structured Hybrid Membrane Nanocontainer for Periodical Monitoring, Separation, and Recovery of Cobalt Ions from Water. Chem Asian J 2015; 10:1909-18. [DOI: 10.1002/asia.201500421] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Indexed: 12/24/2022]
Affiliation(s)
- Sherif A. El-Safty
- National Institute for Materials Science (NIMS); 1-2-1 Sengen Tsukuba-shi, Ibaraki-ken 05-0047 Japan
- Graduate School for Advanced Science and Engineering; Waseda University; 3-4-1 Okubo, Shinjuku-ku Tokyo 169-8555 Japan
| | - Masaru Sakai
- Centre for Research in Isotopes & Environmental Dynamics; Tsukuba University; 265-38 Shin Makita Tsukuba-shi, Ibaraki 305-0076 Japan
| | - Mahmoud M. Selim
- Department of Mathematics & Physics; Al-Aflaj College of Science and Human Studies; Prince Sattam AbdulAziz University; Al-Aflaj 710-11912 Saudi Arabia
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El-Safty SA, Sakai M, Selim MM, Hendi AA. Mesosponge Optical Sinks for Multifunctional Mercury Ion Assessment and Recovery from Water Sources. ACS APPLIED MATERIALS & INTERFACES 2015; 7:13217-31. [PMID: 25965073 DOI: 10.1021/acsami.5b02969] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Using the newly developed organic-inorganic colorant membrane is an attractive approach for the optical detection, selective screening and removal, and waste management recovery of highly toxic elements, such as Hg(II) ions, from water sources. In the systematic mesosponge optical sinks (MOSs), anchoring organic colorants into 3D, well-defined cage cavities and interconnected tubular pores (10 nm) in the long microscale channels of membrane scaffolds enhances the requirements and intrinsic properties of the hierarchal membrane. This scalable design is the first to allow control of the multifunctional processes of a membrane in a one-step screening procedure, such as the detection/recognition, removal, and filtration of ultratrace Hg(II) ions, even from actual water sources (i.e., tap, underground). The selective recovery, detection, and extraction processes of Hg(II) ions in a heterogeneous mixture with inorganic cations and anions as well as organic molecules and surfactants are mainly dependent on the structure of the colorant agent, the pH conditions, competitive ion-system compositions and concentrations, and Hg-to-colorant binding events. Our result shows that the solid MOS membrane arrays can be repeatedly recycled and retain their hierarchal mesosponge sink character, avoiding fouling via the precipitation of metal salts as a result of the reuse cycle. The Hg(II) ion rejection and the permeation of nonselective elements based on the membrane filtration protocol may be key considerations in water purification and separation requirements. The selective recovery process of Hg(II) ions in actual contaminated samples collected from tap and underground water sources in Saudi Arabia indicates the practical feasibility of our designed MOS membrane arrays.
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Affiliation(s)
- Sherif A El-Safty
- †National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken, 05-0047, Japan
- ‡Graduate School for Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | | | - Mahmoud M Selim
- ∥Department of Mathematics, Al-Aflaj College of Science and Human Studies, Prince Sattam Bin Abdulaziz University, Al-Aflaj 710-11912, Saudi Arabia
| | - Awatif A Hendi
- ⊥Department of Physics, College of Science and Humanities-Hawtat Bani Tamim, Prince Sattam Bin Abdulaziz University, Hawtat Bani Tamim, Saudi Arabia
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Derbalah A, El-Safty SA, Shenashen MA, Abdel Ghany NA. Mesoporous Alumina Nanoparticles as Host Tunnel-like Pores for Removal and Recovery of Insecticides from Environmental Samples. Chempluschem 2015; 80:1119-1126. [DOI: 10.1002/cplu.201500098] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Indexed: 11/07/2022]
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9
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El-Safty SA, Sakai M, Selim MM, Alhamide AA. One-pot layer casting-guided synthesis of nanospherical aluminosilica@organosilica@alumina core–shells wrapping colorant dendrites for environmental application. RSC Adv 2015. [DOI: 10.1039/c5ra10324j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Wrapping of dendritic colorant aggregates around core–double shell cavities afforded a container vehicle tracking architecture for recovering toxins in environments.
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Affiliation(s)
- Sherif A. El-Safty
- National Institute for Materials Science (NIMS)
- Tsukuba-shi
- Japan
- Graduate School for Advanced Science and Engineering
- Waseda University
| | - Masaru Sakai
- Centre for Research in Isotopes & Environmental Dynamics
- Tsukuba University
- Tsukuba-shi
- Japan
| | - Mahmoud M. Selim
- Department of Mathematics & Physics
- Al-Aflaj College of Science and Human Studies
- Prince Sattam Bin Abdulaziz University
- Al-Aflaj 710-11912
- Saudi Arabia
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Shenashen MA, El-Safty SA, Elshehy EA, Khairy M. Hexagonal-Prism-Shaped Optical Sensor/Captor for the Optical Recognition and Sequestration of PdIIIons from Urban Mines. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402756] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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11
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Simple and Sensitive Electrochemical Sensor-Based Three-Dimensional Porous Ni-Hemoglobin Composite Electrode. CHEMOSENSORS 2014. [DOI: 10.3390/chemosensors2040235] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Shenashen MA, El-Safty SA, Elshehy EA. Monolithic scaffolds for highly selective ion sensing/removal of Co(ii), Cu(ii), and Cd(ii) ions in water. Analyst 2014; 139:6393-405. [DOI: 10.1039/c4an00980k] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Khairy M, El-Safty SA. Selective encapsulation of hemoproteins from mammalian cells using mesoporous metal oxide nanoparticles. Colloids Surf B Biointerfaces 2013; 111:460-8. [DOI: 10.1016/j.colsurfb.2013.06.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 06/03/2013] [Accepted: 06/18/2013] [Indexed: 11/26/2022]
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15
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Khairy M, El-Safty SA, Shenashen MA, Elshehy EA. Hierarchical inorganic-organic multi-shell nanospheres for intervention and treatment of lead-contaminated blood. NANOSCALE 2013; 5:7920-7927. [PMID: 23851402 DOI: 10.1039/c3nr02403b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The highly toxic properties, bioavailability, and adverse effects of Pb(2+) species on the environment and living organisms necessitate periodic monitoring and removal whenever possible of Pb(2+) concentrations in the environment. In this study, we designed a novel optical multi-shell nanosphere sensor that enables selective recognition, unrestrained accessibility, continuous monitoring, and efficient removal (on the order of minutes) of Pb(2+) ions from water and human blood, i.e., red blood cells (RBCs). The consequent decoration of the mesoporous core/double-shell silica nanospheres through a chemically responsive azo-chromophore with a long hydrophobic tail enabled us to create a unique hierarchical multi-shell sensor. We examined the efficiency of the multi-shell sensor in removing lead ions from the blood to ascertain the potential use of the sensor in medical applications. The lead-induced hemolysis of RBCs in the sensing/capture assay was inhibited by the ability of the hierarchical sensor to remove lead ions from blood. The results suggest the higher flux and diffusion of Pb(2+) ions into the mesopores of the core/multi-shell sensor than into the RBC membranes. These findings indicate that the sensor could be used in the prevention of health risks associated with elevated blood lead levels such as anemia.
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Affiliation(s)
- Mohamed Khairy
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
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Visual monitoring and removal of divalent copper, cadmium, and mercury ions from water by using mesoporous cubic Ia3d aluminosilica sensors. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2013.05.011] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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El-Safty SA, Shenashen MA, Shahat A. Tailor-made micro-object optical sensor based on mesoporous pellets for visual monitoring and removal of toxic metal ions from aqueous media. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:2288-2296. [PMID: 23359538 DOI: 10.1002/smll.201202407] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2012] [Revised: 11/06/2012] [Indexed: 06/01/2023]
Abstract
Methods for the continuous monitoring and removal of ultra-trace levels of toxic inorganic species (e.g., mercury, copper, and cadmium ions) from aqueous media such as drinking water and biological fluids are essential. In this paper, the design and engineering of a simple, pH-dependent, micro-object optical sensor is described based on mesoporous aluminosilica pellets with an adsorbed dressing receptor (a porphyrinic chelating ligand). This tailor-made optical sensor permits ultra-fast (≤ 60 s), specific, pH-dependent visualization and removal of Cu(2+) , Cd(2+) , and Hg(2+) at sub-picomolar concentrations (∼10(-11) mol dm(-3) ) from aqueous media, including drinking water and a suspension of red blood cells. The acidic active acid sites of the pellets consist of heteroatoms arranged around uniformly shaped pores in 3D nanoscale gyroidal mesostructures densely coated with the chelating ligand. The sensor can be used in batch mode, as well as in a flow-through system in which sampling, target ion recognition and removal, and analysis are integrated in a highly automated and efficient manner. Because the pellets exhibit long-term stability, reproducibility, and versatility over a number of analysis/regeneration cycles, they can be expected to be useful for the fabrication of inexpensive sensor devices for naked-eye detection of toxic pollutants.
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Affiliation(s)
- Sherif A El-Safty
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken 05-0047, Japan.
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Bioadsorption of proteins on large mesocage-shaped mesoporous alumina monoliths. Colloids Surf B Biointerfaces 2013. [DOI: 10.1016/j.colsurfb.2012.10.040] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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El-Safty SA, Shenashen MA, Ismail AA. A multi-pH-dependent, single optical mesosensor/captor design for toxic metals. Chem Commun (Camb) 2013; 48:9652-4. [PMID: 22908121 DOI: 10.1039/c2cc34788a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fabrication of low-cost, simple nanodesigns with sensing/capture functionality has been called into question by the toxicity and non-degradability of toxic metals, as well as the persistent threat they pose to human lives. In this study, a single, pH-dependent, mesocaptor/sensor was developed for the optical and selective removal of toxic ions from drinking water and physiological systems such as blood.
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Affiliation(s)
- Sherif A El-Safty
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken 305-0047, Japan.
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El-Safty SA, Hoa ND, Shenashen MA. Topical Developments of Nanoporous Membrane Filters for Ultrafine Noble Metal Nanoparticles. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200629] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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El-Safty SA, Shenashen MA, Khairy M. Optical detection/collection of toxic Cd(II) ions using cubic Ia3d aluminosilica mesocage sensors. Talanta 2012; 98:69-78. [DOI: 10.1016/j.talanta.2012.06.046] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 06/15/2012] [Accepted: 06/18/2012] [Indexed: 10/28/2022]
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El-Safty SA, Shenashen MA, Ismael M, Khairy M. Encapsulation of proteins into tunable and giant mesocage alumina. Chem Commun (Camb) 2012; 48:6708-10. [PMID: 22627879 DOI: 10.1039/c2cc30725a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Protein bioadsorption has rapidly attracted attention partially because of the promising advances in diagnostic assays, sensors, separations, and gene technology. Tunable and giant mesocage alumina cavities (5 nm to 20 nm) show capability in size-selective encapsulation and diffusivity of large proteins into interior pores.
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Affiliation(s)
- Sherif A El-Safty
- National Institute for Materials Science, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken 305-0047, Japan.
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El-Safty SA, Shahat A, Ismael M. Mesoporous aluminosilica monoliths for the adsorptive removal of small organic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2012; 201-202:23-32. [PMID: 22169140 DOI: 10.1016/j.jhazmat.2011.10.088] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 10/19/2011] [Accepted: 10/31/2011] [Indexed: 05/31/2023]
Abstract
Water treatment for the removal of organic or inorganic pollutants has become a serious global issue because of the increasing demand for public health awareness and environmental quality. The current paper, reports the applicability of mesoporous aluminosilica monoliths with three-dimensional structures and aluminum contents with 19≤Si/Al≥1 as effective adsorbents of organic molecules from an aqueous solution. Mesocage cubic Pm3n aluminosilica monoliths were successfully fabricated using a simple, reproducible, and direct synthesis. The acidity of the monoliths significantly increased with increasing amounts of aluminum species in the silica pore framework walls. The batch adsorption of the organic pollutants onto (10 g/L) aluminosilica monoliths was performed in an aqueous solution at various temperatures. These adsorbents exhibit efficient removal of organic pollutants (e.g., aniline, p-chloroaniline, o-aminophenol, and p-nitroaniline) of up to 90% within a short period (in the order of minutes). In terms of proximity adsorption, the functional acid sites and the condensed and rigid monoliths with tunable periodic scaffolds of the cubic mesocages are useful in providing easy-to-use removal assays for organic compounds and reusable adsorbents without any mesostructural damage, even under chemical treatment for a number of repeated cycles.
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Affiliation(s)
- Sherif A El-Safty
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken 305-0047, Japan.
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Khairy M, El-Safty SA, Ismael M. Mesoporous nanomagnet supercaptors for selective heme-proteins from human cells. Chem Commun (Camb) 2012; 48:10832-4. [DOI: 10.1039/c2cc35638d] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Hoa ND, El-Safty SA. Gas nanosensor design packages based on tungsten oxide: mesocages, hollow spheres, and nanowires. NANOTECHNOLOGY 2011; 22:485503. [PMID: 22071572 DOI: 10.1088/0957-4484/22/48/485503] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Achieving proper designs of nanosensors for highly sensitive and selective detection of toxic environmental gases is one of the crucial issues in the field of gas sensor technology, because such designs can lead to the enhancement of gas sensor performance and expansion of their applications. Different geometrical designs of porous tungsten oxide nanostructures, including the mesocages, hollow spheres and nanowires, are synthesized for toxic gas sensor applications. Nanosensor designs with small crystalline size, large specific surface area, and superior physical characteristics enable the highly sensitive and selective detection of low concentration (ppm levels), highly toxic NO(2) among CO, as well as volatile organic compound gases, such as acetone, benzene, and ethanol. The experimental results showed that the sensor response was not only dependent on the specific surface area, but also on the geometries and crystal size of materials. Among the designed nanosensors, the nanowires showed the highest sensitivity, followed by the mesocages and hollow spheres-despite the fact that mesocages had the largest specific surface area of 80.9 m(2) g( - 1), followed by nanowires (69.4 m(2) g( - 1)), and hollow spheres (6.5 m(2) g( - 1)). The nanowire sensors had a moderate specific surface area (69.4 m(2) g( - 1)) but they exhibited the highest sensitivity because of their small diameter (∼5 nm), which approximates the Debye length of WO(3). This led to the depletion of the entire volume of the nanowires upon exposure to NO(2), resulting in an enormous increase in sensor resistance.
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Affiliation(s)
- Nguyen Duc Hoa
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba-shi, Ibaraki, Japan
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