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Al-Hussaini AS, Abdel-Hameed EM, Hassan MER. Synthesis of Smart Core-shell Nanocomposites with Enhanced Photocatalytic Efficacy. POLYM-PLAST TECH MAT 2020. [DOI: 10.1080/25740881.2020.1784214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Ayman S. Al-Hussaini
- Chemistry Department, Faculty of Science, Port Said University, Port Said, Egypt
| | | | - Mohamed E. R. Hassan
- Chemistry Department, Faculty of Science, Port Said University, Port Said, Egypt
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Gogoi A, Anki Reddy K, Mondal PK. Influence of the presence of cations on the water and salt dynamics inside layered graphene oxide (GO) membranes. NANOSCALE 2020; 12:7273-7283. [PMID: 32196024 DOI: 10.1039/c9nr09288a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although over the past few years, graphene oxide (GO) has emerged as a promising membrane material, the applicability of layered GO membranes in water purification/seawater desalination is still a challenging issue because of the undesirable swelling of GO laminates in the aqueous environment. One of the ways to tune the interlayer spacing and to arrest the undesirable swelling of layered GO membranes in the aqueous environment is to intercalate the interlayer spacing of the GO laminates with cations. Although the cation intercalation imparts stabilization to GO laminates in the aqueous environment, their effect on the performance of the membrane is yet to be addressed in detail. In the present study we have investigated the effect of cation intercalation on the performance of layered GO membranes using molecular dynamics simulation. For the same interlayer spacing, the cation intercalated layered GO membranes have a higher water flux as compared to the corresponding pristine layered GO membranes. In the presence of the cations, the water molecules inside the interlayer gallery get more compactly packed. The presence of the cations also increases the stability of the hydrogen bond network among the water molecules inside the membrane. This can be attributed to slow water reorientation dynamics inside the interlayer gallery in the presence of the cations. The synergistic effect of all these changes is that the water permeability through the cation intercalated layered GO membranes is higher as compared to that through the corresponding pristine layered GO membranes. On the other hand, the intercalation of the cations (K+, Mg2+) leads to higher rejection of Na+ ions whereas the rejection of Cl- ions slightly decreases.
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Affiliation(s)
- Abhijit Gogoi
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam, India
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Padua LMG, Yeh JM, Santiago KS. A Novel Application of Electroactive Polyimide Doped with Gold Nanoparticles: As a Chemiresistor Sensor for Hydrogen Sulfide Gas. Polymers (Basel) 2019; 11:polym11121918. [PMID: 31766447 PMCID: PMC6961021 DOI: 10.3390/polym11121918] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 11/20/2019] [Accepted: 11/20/2019] [Indexed: 01/19/2023] Open
Abstract
This research paper presents a new application of electroactive polyimide doped with gold nanoparticles (PI/AuNPs) as a chemiresistor sensor for detecting hydrogen sulfide gas. The synthesis of PI/AuNPs was done in a simple 3-step process of polymerization using the as prepared amine-capped aniline trimer (ACAT), followed by imidization, and doping. Spectral analyses via FTIR, LC-MS and 1H-NMR confirmed the formation of amine-capped aniline trimer with a MW of 288 g mol−1. Comparison of ACAT, BSAA, and PI FTIR spectra showed successful polymerization of the last, while XRD validated the incorporation of metal nanoparticles onto the polymer matrix, showing characteristic diffraction peaks corresponding to gold. Furthermore, TEM, and FE-SEM revealed the presence of well-dispersed Au nanoparticles with an average diameter of about 60 nm. The electroactive PI/AuNPs-based sensor showed a sensitivity of 0.29% ppm−1 H2S at a linear concentration range of 50 to 300 ppm H2S (r = 0.9777). The theoretical limit of detection was found at 0.142 ppm or 142 ppb H2S gas. The sensor provided a stable response reading at an average response time of 43 ± 5 s, which was easily recovered after an average time of 99 ± 5 s. The sensor response was highly repeatable and reversible, with RSD values of 8.88%, and 8.60%, respectively. Compared with the performance of the conventional conducting polyaniline also doped with gold nanoparticles (PANI/AuNPs), the fabricated electroactive PI/AuNPs exhibited improved sensing performance making it a potential candidate in monitoring H2S in the environment and for work-related safety.
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Affiliation(s)
- Lee Marvin G. Padua
- Department of Math and Physics, College of Science, University of Santo Tomas, Manila 1008, Philippines;
| | - Jui-Ming Yeh
- Department of Chemistry, Research and Development Center for membrane Technology, Center for Nanotechnology, Chung Yuan Christian University, Zhongli, Taoyuan 32023, Taiwan
- Correspondence: (J.-M.Y.); (K.S.S.)
| | - Karen S. Santiago
- Department of Chemistry, College of Science; Research Center for Natural and Applied Sciences, University of Santo Tomas, Manila 1008, Philippines
- Correspondence: (J.-M.Y.); (K.S.S.)
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Ehsani A, Heidari AA, Shiri HM. Electrochemical Pseudocapacitors Based on Ternary Nanocomposite of Conductive Polymer/Graphene/Metal Oxide: An Introduction and Review to it in Recent Studies. CHEM REC 2018; 19:908-926. [DOI: 10.1002/tcr.201800112] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Ali Ehsani
- Department of Chemistry, Faculty of scienceUniversity of Qom Qom Iran
| | - Ali Akbar Heidari
- Department of Chemistry, Faculty of scienceUniversity of Qom Qom Iran
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Wang J, Zhang P, Liang B, Liu Y, Xu T, Wang L, Cao B, Pan K. Graphene Oxide as an Effective Barrier on a Porous Nanofibrous Membrane for Water Treatment. ACS APPLIED MATERIALS & INTERFACES 2016; 8:6211-8. [PMID: 26849085 DOI: 10.1021/acsami.5b12723] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A novel graphene oxide (GO)-based nanofiltration membrane on a highly porous polyacrylonitrile nanofibrous mat (GO@PAN) is prepared for water treatment applications. GO with large lateral size (more than 200 μm) is first synthesized through an improved Hummers method and then assembled on a highly porous nanofibrous mat by vacuum suction method. The prepared GO@PAN membrane is characterized by scanning electron microscopy, transmission electron microscopy, Raman spectrum, X-ray diffraction, and so forth. The results show that graphene oxide can form a barrier on the top of a PAN nanofibrous mat with controllable thickness. The obtained graphene oxide layer exhibits "ideal" pathways (hydrophobic nanochannel) for water molecules between the well-stacked GO nanosheets. Water flux under an extremely low external pressure (1.0 bar) significantly increased due to the unique structure of the GO layer and nanofibrous support. Furthermore, the GO@PAN membrane shows high rejection performance (nearly 100% rejection of Congo red and 56.7% for Na2SO4). A hydrophilic-hydrophobic "gate"-nanochannel model is presented for explaining the water diffusion mechanism through the GO layer. This method for fabrication of the GO membrane on a highly porous support may provide many new opportunities for high performance nanofiltration applications.
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Affiliation(s)
- Jianqiang Wang
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
- Department of Civil Engineering, The University of Hong Kong , Hong Kong 999077, P. R. China
| | - Pan Zhang
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Bin Liang
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Yuxuan Liu
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Tao Xu
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Lifang Wang
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Bing Cao
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
| | - Kai Pan
- Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology , Beijing 100029, P. R. China
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Choe KY, Lee JY. Synthesis and electro-optic properties of novel X-type polyester containing dioxynitrobenzylidenecyanoacetate with highly enhanced thermal stability of dipole alignment. Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-015-1430-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Sheng W, Chen Q, Yang P, Chen C. Synthesis, characterization, and enhanced properties of novel graphite-like carbon nitride/polyimide composite films. HIGH PERFORM POLYM 2015. [DOI: 10.1177/0954008314566894] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this article, polyimide (PI) composite films reinforced by graphitic carbon nitride (g-C3N4) have been synthesized using the in situ polymerization process via thermal imidization. Poly (amic acid) (PAA) solutions were prepared from pyromellitic dianhydride (PMDA) and 4,4′-(4,4′-isopropylidenediphenyl-1,1′-diyldioxy) dianiline (BAPP) in N,N-dimethylacetamide (DMAc) solvent. The different amounts of g-C3N4 obtained from the direct pyrolysis of dicyandiamide (DCDA) at 600°C were incorporated into PAA matrix, which formed g-C3N4/PI composite films by thermal imidization. The morphological structures of the synthesized g-C3N4 and g-C3N4/PI composite films were characterized using fourier transform infrared spectroscopy, x-ray diffraction, scanning electron microscopy and transmission electron microscopy. With 2 wt% g-C3N4 incorporated, the tensile strength and elongation at break of g-C3N4/PI composites were increased by about 23% and 21%, respectively, due to the strong interaction between the g-C3N4 particles and PI. Thermogravimetric analysis indicated that the incorporation of g-C3N4 improved the thermal stability of the PI at low g-C3N4 content. Besides, the dielectric and optical properties of these composites were also studied in this article.
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Affiliation(s)
- Weichen Sheng
- School of Material Science and Engineering, Jiangsu University, Zhenjiang, People’s Republic of China
| | - Qiao Chen
- School of Material Science and Engineering, Jiangsu University, Zhenjiang, People’s Republic of China
| | - Peijuan Yang
- Zhejiang Economics and Trade Polytechnic, Hangzhou, People’s Republic of China
| | - Caifeng Chen
- School of Material Science and Engineering, Jiangsu University, Zhenjiang, People’s Republic of China
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Abstract
Graphene-based nanofillers and their applications. Fabrication methods of graphene-based nanocomposites. Interaction and dispersion of graphene-based fillers in polymer matrices. Current trends and prospects of graphene-based nanocomposites.
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Affiliation(s)
- W. K. Chee
- Department of Chemistry
- Faculty of Science
- Universiti Putra Malaysia
- Malaysia
| | - H. N. Lim
- Department of Chemistry
- Faculty of Science
- Universiti Putra Malaysia
- Malaysia
- Functional Device Laboratory
| | - N. M. Huang
- Low Dimension Materials Research Centre
- Department of Physics
- Faculty of Science
- University of Malaya
- Kuala Lumpur 50603
| | - I. Harrison
- Faculty of Engineering
- The University of Nottingham Malaysia Campus
- Malaysia
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Tseng IH, Tsai MH, Chung CW. Flexible and transparent polyimide films containing two-dimensional alumina nanosheets templated by graphene oxide for improved barrier property. ACS APPLIED MATERIALS & INTERFACES 2014; 6:13098-13105. [PMID: 25029634 DOI: 10.1021/am502962b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Unique two-dimensional alumina nanosheets (Alns) using graphene oxide (GO) as templates are fabricated and successfully incorporated with organo-soluble polyimide (PI) to obtain highly transparent PI nanocomposite films with improved moisture barrier property. The effects of filler types and contents on water vapor transmission rate (WVTR) and transparency of PI are systematically studied. The hydroxyl groups on GO react with aluminum isopropoxide via sol-gel process to obtain alumina coverd-GO (Al-GO), and then thermal decomposition is applied to obtain Alns. Alns are the most efficient fillers among others to restrict the diffusion of water vapor within PI matrix and simultaneously maintain the transparency of PI. XRD pattern, TEM, and AFM images confirm the sheet-like morphology of Alns with ultrahigh aspect ratio. With only 0.01 wt % of Alns, the PI nanocomposite film exhibits the most significant reduction of 95% in WVTR as compared to that of pure PI film. Most importantly, the resultant PI/Alns-0.01 film exhibits excellent optical transparency and high mechanical strength and great thermal stability.
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Affiliation(s)
- I-Hsiang Tseng
- Department of Chemical Engineering, Feng Chia University , No. 100, Wenhwa Road, Seatwen District, Taichung 40724, Taiwan
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