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Ghasemi F, Fahimi-Kashani N, Bigdeli A, Alshatteri AH, Abbasi-Moayed S, Al-Jaf SH, Merry MY, Omer KM, Hormozi-Nezhad MR. Paper-based optical nanosensors – A review. Anal Chim Acta 2022; 1238:340640. [DOI: 10.1016/j.aca.2022.340640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 11/23/2022]
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2
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Ichiura H, Seike T, Kozu A. Acetaldehyde gas removal by a nylon film-TiO 2 composite sheet prepared on a paper surface using interfacial polymerization and electrostatic interactions. CHEMOSPHERE 2020; 256:127143. [PMID: 32473469 DOI: 10.1016/j.chemosphere.2020.127143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 05/14/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Abstract
In this study, preparation of a nylon film-TiO2 composite sheet with both physical durability under UV irradiation and TiO2 photocatalysis functionality was investigated. First, a nylon film was directly prepared on paper by interfacial polymerization using ethylenediamine and terephthaloyl chloride in a cyclohexane-chloroform mixture (3:1, v/v). Next, the nylon-coated paper was treated with tetraethyl orthosilicate and 3-aminopropyltrimethoxysilane to prepare polysiloxane on its surface. This was followed by fixation of TiO2 powder via electrostatic interactions with the polysiloxane. Although nylon films on paper usually decompose under TiO2 photocatalysis, the nylon film-TiO2 composite sheets prepared using 0.5%-1.0% (w/v) TiO2 did not decompose under photocatalysis. The residual rate of strength of the sheet remained at almost 100% after 240 h, which could be attributed to protection of the sheet by the polysiloxane layer. The nylon film was fibrous and could effectively adsorb acetaldehyde gas. All of the nylon film-TiO2 composite sheets prepared using 0.5%-5.0% TiO2 photocatalytically removed acetaldehyde under UV irradiation and no acetaldehyde gas was detected after 240-300 min. These results show the nylon film-TiO2 composite sheet can effectively remove acetaldehyde gas by photocatalysis and adsorption and could be applied to removal of volatile organic compounds in indoor air.
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Affiliation(s)
- Hideaki Ichiura
- Faculty of Agriculture, Kochi University, 200 Monobe-Otsu, Nankoku, Kochi, 783-8502, Japan.
| | - Takenori Seike
- Faculty of Agriculture, Kochi University, 200 Monobe-Otsu, Nankoku, Kochi, 783-8502, Japan
| | - Ayako Kozu
- Faculty of Agriculture, Kochi University, 200 Monobe-Otsu, Nankoku, Kochi, 783-8502, Japan
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3
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Skwierczyńska M, Runowski M, Goderski S, Szczytko J, Rybusiński J, Kulpiński P, Lis S. Luminescent-Magnetic Cellulose Fibers, Modified with Lanthanide-Doped Core/Shell Nanostructures. ACS OMEGA 2018; 3:10383-10390. [PMID: 31459166 PMCID: PMC6645153 DOI: 10.1021/acsomega.8b00965] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 08/15/2018] [Indexed: 05/30/2023]
Abstract
Novel luminescent-magnetic cellulose microfibers were prepared by a dry-wet spinning method with the use of N-methylmorpholine-N-oxide. The synthesized luminescent-magnetic core/shell type nanostructures, based on the lanthanide-doped fluorides and magnetite nanoparticles (NPs)-Fe3O4/SiO2/NH2/PAA/LnF3, were used as nanomodifiers of the fibers. Thanks to the successful incorporation of the bifunctional nanomodifiers into the cellulose structure, the functionalized fibers exhibited superior properties, that is, bright multicolor emission under UV light and strong magnetic response. By the use of the as-prepared fibers, the luminescent-magnetic thread was fabricated and used to sew and make a unique pattern in the glove material, as a proof of concept for advanced, multimodal cloths'/materials' protection against counterfeiting. The presence and uniform distribution of the modifier NPs in the polymer matrix were confirmed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray analysis (EDX). The concentration of the modifier NPs in the fibers was determined by inductively coupled plasma mass spectrometry, EDX, and magnetic measurements. The luminescence characteristics of the materials were examined by photoluminescence spectroscopy, and their magnetic field-responsive behavior was investigated by a superconducting quantum interference device.
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Affiliation(s)
- Małgorzata Skwierczyńska
- Faculty
of Chemistry, Department of Rare Earths, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
| | - Marcin Runowski
- Faculty
of Chemistry, Department of Rare Earths, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
| | - Szymon Goderski
- Faculty
of Chemistry, Department of Rare Earths, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
| | - Jacek Szczytko
- Faculty
of Physics, Institute of Experimental Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - Jarosław Rybusiński
- Faculty
of Physics, Institute of Experimental Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - Piotr Kulpiński
- Department
of Man-Made Fibers, Technical University
of Lodz, Żeromskiego 116, 90-924 Lodz, Poland
| | - Stefan Lis
- Faculty
of Chemistry, Department of Rare Earths, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
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Sboui M, Bouattour S, Liotta LF, Parola VL, Gruttadauria M, Marcì G, Boufi S. Paper-TiO2 composite: An effective photocatalyst for 2-propanol degradation in gas phase. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.09.074] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Fujiwara K, Kuwahara Y, Sumida Y, Yamashita H. Fabrication of Photocatalytic Paper Using TiO 2 Nanoparticles Confined in Hollow Silica Capsules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:288-295. [PMID: 28004939 DOI: 10.1021/acs.langmuir.6b04003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
TiO2 nanoparticles (NPs) encapsulated in hollow silica spheres (TiO2@HSSs) show a shielding-effect that can insulate photocatalytically active TiO2 NPs from the surrounding environment and thus prohibit the self-degradation of organic support materials under ultraviolet (UV)-light irradiation. In this study, photocatalytically active papers were fabricated by combining TiO2@HSS and cellulose fibers, and their photocatalytic activities and durability under UV-light irradiation were examined. The yolk-shell nanostructured TiO2@HSS, which has an ample void space between inner TiO2 NPs and an outer silica shell, was synthesized using a facile single-step method utilizing an oil-in-water microemulsion as an organic template. The thus-prepared TiO2@HSS particles were deposited onto a cellulose paper either by the chemical adhesion process via ionic bonding or by the physical adhesion process using a dual polymer system. The obtained paper containing TiO2@HSS particles with high air permeability exhibited a higher photocatalytic activity in the photocatalytic decomposition of volatile organic compounds than unsupported powdery TiO2@HSS particles because of the uniform dispersion on the paper with a reticular fiber network. In addition, the paper was hardly damaged under UV-light irradiation, whereas the paper containing naked TiO2 NPs showed a marked deterioration with a considerably decreased strength, owing to the ability of the silica shell to prevent direct contact between TiO2 and organic fibers. This study can offer a promising method to fabricate photocatalytically active papers with a photoresistance property available for real air cleaning.
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Affiliation(s)
- Kensei Fujiwara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Paper Technology Center, Ehime Institute of Industrial Technology , 127 Mendori-cho, Shikokuchuo, Ehime 799-0113, Japan
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University , Katsura, Kyoto 615-8520, Japan
| | - Yuki Sumida
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University , Katsura, Kyoto 615-8520, Japan
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Chemically-modified cellulose paper as a microstructured catalytic reactor. Molecules 2015; 20:1495-508. [PMID: 25599152 PMCID: PMC6272338 DOI: 10.3390/molecules20011495] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 01/12/2015] [Indexed: 11/17/2022] Open
Abstract
We discuss the successful use of chemically-modified cellulose paper as a microstructured catalytic reactor for the production of useful chemicals. The chemical modification of cellulose paper was achieved using a silane-coupling technique. Amine-modified paper was directly used as a base catalyst for the Knoevenagel condensation reaction. Methacrylate-modified paper was used for the immobilization of lipase and then in nonaqueous transesterification processes. These catalytic paper materials offer high reaction efficiencies and have excellent practical properties. We suggest that the paper-specific interconnected microstructure with pulp fiber networks provides fast mixing of the reactants and efficient transport of the reactants to the catalytically-active sites. This concept is expected to be a promising route to green and sustainable chemistry.
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Ichiura H, Seike T, Ohtani Y. Interfacial Polymerization of Functional Paper: Morphology of the Nylon Film Prepared on Paper Surfaces. Ind Eng Chem Res 2013. [DOI: 10.1021/ie401082a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hideaki Ichiura
- Faculty of Agriculture, Kochi University, 200 Monobe-Otsu, Nankoku, Kochi 783-8502, Japan
| | - Takenori Seike
- Faculty of Agriculture, Kochi University, 200 Monobe-Otsu, Nankoku, Kochi 783-8502, Japan
| | - Yoshito Ohtani
- Faculty of Agriculture, Kochi University, 200 Monobe-Otsu, Nankoku, Kochi 783-8502, Japan
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8
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Ichiura H, Kaneda Y. Direct preparation of gelatin microcapsules on paper surface using simple coacervation technique. J Appl Polym Sci 2013. [DOI: 10.1002/app.38941] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Diao Z, Kwong FL, Li J, Lian J, Lai KT, Ng DH. Catalytic Activity of Biomorphic α-MoO(3) in the Degradation of Methyl Violet Dye. ENVIRONMENTAL ENGINEERING SCIENCE 2012; 29:860-865. [PMID: 22969268 PMCID: PMC3429327 DOI: 10.1089/ees.2011.0184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Accepted: 11/24/2011] [Indexed: 06/01/2023]
Abstract
A network of fibers comprising orthorhombic molybdenum trioxide (α-MoO(3)) crystals were synthesized using paper as template via a biomorphic approach. The template was completely removed by annealing the sample at 600°C for 5 min. Monoclinic MoO(3) was formed and consequently converted into orthorhombic α-MoO(3) after prolonged annealing. Three milligrams of the biomorphic α-MoO(3) could degrade up to 90% of a methyl violet aqueous solution with a concentration of 20 mg/L under normal visible light. The size of the α-MoO(3) grains and the porosity of the biomorphic sample affected catalytic performance.
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Affiliation(s)
| | | | | | | | | | - Dickon H.L. Ng
- Corresponding author: Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China. Phone: (852) 3943-6392; Fax: (852) 3163-4070. E-mail:
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Ichiura H, Takayama M, Nishida N, Otani Y. Interfacial polymerization preparation of functional paper coated with polyamide film containing volatile essential oil. J Appl Polym Sci 2011. [DOI: 10.1002/app.33900] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Yang J, Liu K, Jia J, Cao L. Electro-scrubbing volatile organic carbons in the air stream with a gas diffusion electrode. JOURNAL OF HAZARDOUS MATERIALS 2011; 188:125-131. [PMID: 21324588 DOI: 10.1016/j.jhazmat.2011.01.082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Revised: 01/17/2011] [Accepted: 01/18/2011] [Indexed: 05/30/2023]
Abstract
It is demonstrated that exposing the VOC air streams to the electro-scrubbing reactor with a gas diffusion electrode leads to an efficient removal of organics. The importance order of the influence factors on the electro-scrubbing reactor performance is: conductivity, voltage and air stream flow-rate. The effective conductivity and high voltages generally are beneficial to the removal process and the air flow-rate is not a significant factor compared with the other two, indicating that the reactor might have a consistently satisfying performance within a wide range of gas volumetric load. The mass transfer of both organics and oxygen in the reactor is estimated by mathematical model, and the calculation determines the concentration boundary conditions for the 2-ethoxyethyl acetate removal: if the 2-ethoxyethyl acetate concentration in the inflow air stream holds C(G,i) ≤ 0.7198%, the removal in the electro-scrubbing reactor is electrochemical reaction controlled; if C(G,i)>0.7198%, the controlling step will be the oxygen mass transfer from the air to the liquid in the electro-scrubbing reactor. The Apparent Current Efficiency of the electro-scrubbing reactor was also determined using COD data, which is significantly higher than some commercial metal oxide electrodes, showing that the reactor is energy efficient and has the promise for the future scale-up.
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Affiliation(s)
- Ji Yang
- School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, PR China.
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Ngo YH, Li D, Simon GP, Garnier G. Paper surfaces functionalized by nanoparticles. Adv Colloid Interface Sci 2011; 163:23-38. [PMID: 21324427 DOI: 10.1016/j.cis.2011.01.004] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Revised: 01/13/2011] [Accepted: 01/13/2011] [Indexed: 10/18/2022]
Abstract
Nanomaterials with unique electronic, optical and catalytic properties have recently been at the forefront of research due to their tremendous range of applications. Taking gold, silver and titania nanoparticles as examples, we have reviewed the current research works on paper functionalized by these nanoparticles. The functionalization of paper with only a very small concentration of nanoparticles is able to produce devices with excellent photocatalytic, antibacterial, anti-counterfeiting, Surface Enhanced Raman Scattering (SERS) and Surface Plasmon Resonance (SPR) performances. This review presents a brief overview of the properties of gold, silver and titania nanoparticles which contribute to the major applications of nanoparticles-functionalized paper. Different preparation methods of the nanoparticles-functionalized paper are reviewed, focusing on their ability to control the morphology and structure of paper as well as the spatial location and adsorption state of nanoparticles which are critical in achieving their optimum applications. In addition, main applications of the nanoparticles-functionalized papers are highlighted and their critical challenges are discussed, followed by perspectives on the future direction in this research field. Whilst a few studies to date have characterized the distribution of nanoparticles on paper substrates, none have yet optimized paper as a nanoparticles' substrate. There remains a strong need to improve understanding on the optimum adsorption state of nanoparticles on paper and the heterogeneity effects of paper on the properties of these nanoparticles.
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Baruah S, Jaisai M, Imani R, Nazhad MM, Dutta J. Photocatalytic paper using zinc oxide nanorods. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2010; 11:055002. [PMID: 27877367 PMCID: PMC5090626 DOI: 10.1088/1468-6996/11/5/055002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 11/29/2010] [Accepted: 09/28/2010] [Indexed: 05/27/2023]
Abstract
Zinc oxide (ZnO) nanorods were grown on a paper support prepared from soft wood pulp. The photocatalytic activity of a sheet of paper with ZnO nanorods embedded in its porous matrix has been studied. ZnO nanorods were firmly attached to cellulose fibers and the photocatalytic paper samples were reused several times with nominal decrease in efficiency. Photodegradation of up to 93% was observed for methylene blue in the presence of paper filled with ZnO nanorods upon irradiation with visible light at 963 Wm-2 for 120 min. Under similar conditions, photodegradation of approximately 35% was observed for methyl orange. Antibacterial tests revealed that the photocatalytic paper inhibits the growth of Escherichia coli under room lighting conditions.
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Affiliation(s)
- Sunandan Baruah
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, Klong Luang, Pathumthani 12120, Thailand
| | - Mayuree Jaisai
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, Klong Luang, Pathumthani 12120, Thailand
| | - Reza Imani
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, Klong Luang, Pathumthani 12120, Thailand
- Now at: Wood and Paper Department, Islamic Azad University, Tehran, Iran
| | - Mousa M Nazhad
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, Klong Luang, Pathumthani 12120, Thailand
| | - Joydeep Dutta
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, Klong Luang, Pathumthani 12120, Thailand
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15
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Ferraria AM, Boufi S, Battaglini N, Botelho do Rego AM, ReiVilar M. Hybrid systems of silver nanoparticles generated on cellulose surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1996-2001. [PMID: 19894686 DOI: 10.1021/la902477q] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A method to produce hybrid systems of cellulose ultrathin films containing immobilized silver nanoparticles (Ag NPs) generated and grown at the surface is presented. Ag NPs were produced via a mild wet chemistry technique on cellulose ultrathin films spin-coated on GaAs substrates and on modified films after grafting of diaminoalkanes activated by N,N'-carbonyldiimidazole. Appended amine groups operate as anchoring centers of the silver NPs enabling selective generation and immobilization of Ag NPs. The different phases of the modification process were followed by Fourier transform infrared spectroscopy (FTIRS) in attenuated total reflection in multiple internal reflections (ATR/MIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The generation of NPs is observed even on untreated cellulose surfaces with sizes ranging from 7 to 30 nm but not specifically at the surface. For modified surfaces with diaminoalkanes, higher NP density regions including extensive plates are obtained, which are specifically located at the film extreme surface. The highest NP density is achieved when the NP generation is performed on these modified surfaces in the presence of a carboxylic salt.
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Affiliation(s)
- Ana Maria Ferraria
- Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, IST, Technical University of Lisbon, Portugal
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Anderson RE, Guan J, Ricard M, Dubey G, Su J, Lopinski G, Dorris G, Bourne O, Simard B. Multifunctional single-walled carbon nanotube–cellulose composite paper. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b924260k] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Granular-activated carbon adsorption followed by annular-type photocatalytic system for control of indoor aromatic compounds. Sep Purif Technol 2009. [DOI: 10.1016/j.seppur.2009.02.014] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Peng CQ, Thio YS, Gerhardt RA. Conductive paper fabricated by layer-by-layer assembly of polyelectrolytes and ITO nanoparticles. NANOTECHNOLOGY 2008; 19:505603. [PMID: 19942775 DOI: 10.1088/0957-4484/19/50/505603] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new salt-free approach was developed for fabricating conductive paper by layer-by-layer (LBL) assembly of conductive indium tin oxide (ITO) nanoparticles and polyelectrolytes onto wood fibers. Subsequent to the coating procedure, the fibers were manufactured into conductive paper using traditional paper making methods. The wood fibers were first coated with polyethyleneimine (PEI) and then LBL assembled with poly(sodium 4-styrenesulfonate) (PSS) and ITO for several bilayers. The surface charge intensity of both the ITO nanoparticles and the coated wood fibers were evaluated by measuring the zeta-potential of the nanoparticles and short fibers, respectively. The ITO nanoparticles were found to preferentially aggregate on defects on the fiber surfaces and formed interconnected paths, which led to the formation of conductive percolation paths throughout the whole paper. With ten bilayer coatings, the as-made paper was made DC conductive, and its sigma(dc) was measured to be 5.2 x 10(-6) S cm(-1) in the in-plane (IP) direction, while the conductivity was 1.9 x 10(-8) S cm(-1) in the through-the-thickness (TT) direction. The percolation phenomena in these LBL-assembled ITO-coated paper fibers was evaluated using scanning electron microscopy (SEM), current atomic force microscopy (I-AFM), and impedance measurements. The AC electrical properties are reported for frequencies ranging from 0.01 Hz to 1 MHz. A clear transition from insulating to conducting behavior is observed in the AC conductivity.
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Affiliation(s)
- C Q Peng
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, USA. School of Polymer Textile and Fiber Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, USA
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Ohmichi K, Matsuno Y, Miyaso H, Yamamoto H, Toriuchi M, Shimane M, Mori C. Pilot Study of a Dissection Table for Gross Anatomy Laboratory Equipped with a Photocatalytic Device that Decomposes Formaldehyde. J Occup Health 2007; 49:499-503. [DOI: 10.1539/joh.49.499] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
| | - Yoshiharu Matsuno
- Department of Bioenvironmental MedicineJapan
- Environmental Health Science Project for Future Generations, Graduate School of MedicineJapan
- Center for Environment, Health and Field SciencesChiba UniversityJapan
| | | | | | | | | | - Chisato Mori
- Department of Bioenvironmental MedicineJapan
- Environmental Health Science Project for Future Generations, Graduate School of MedicineJapan
- Center for Environment, Health and Field SciencesChiba UniversityJapan
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Salthammer T, Fuhrmann F. Photocatalytic surface reactions on indoor wall paint. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2007; 41:6573-6578. [PMID: 17948810 DOI: 10.1021/es070057m] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The reduction of indoor air pollutants by air cleaning systems has received considerable interest, and a number of techniques are now available. So far, the method of photocatalysis was mainly applied by use of titanium dioxide (TiO2) in flow reactors under UV light of high intensity. Nowadays, indoor wall paints are equipped with modified TiO2 to work as a catalyst under indoor daylight or artificial light. In chamber experiments carried out under indoor related conditions itwas shown thatthe method works for nitrogen dioxide with air exchange and for formaldehyde without air exchange at high concentrations. In further experiments with volatile organic compounds (VOCs), a small effect was found for terpenoids with high kOH rate constants. For other VOCs and carbon monoxide there was no degradation at all or the surface acted as a reversible sink. Secondary emissions from the reaction of paint constituents were observed on exposure to light. From the results it is concluded that recipes of photocatalytic wall paints need to be optimized for better efficiency under indoor conditions.
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Affiliation(s)
- T Salthammer
- Material Analysis and Indoor Chemistry, Fraunhofer Wilhelm-Klauditz Institute, Bienroder Weg 54 E, 38108 Braunschweig, Germany.
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