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Ahn SY, Song YS. Enhanced Dichroism of Polarizing Composite Films by Embedding Sepiolite. ACS OMEGA 2024; 9:25793-25799. [PMID: 38911710 PMCID: PMC11191128 DOI: 10.1021/acsomega.3c10402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 05/19/2024] [Accepted: 05/28/2024] [Indexed: 06/25/2024]
Abstract
The present study investigated the use of fibrous nanoparticle-filled polarizing films. Sepiolites were selected as nanoparticles and incorporated into a PVA-iodine complex. The resulting nanocomposite film was elongated and dyed with iodine. Various properties of the nanocomposite polarizing films, including thermal, morphological, optical, and rheological features, were experimentally analyzed. The study demonstrated that an increase in sepiolite loading was accompanied by an enhancement in both the mechanical and viscoelastic properties. In particular, the incorporation of nanoparticles led to an increase in birefringence and the degree of polarization. This was attributed to the alteration of the internal structure of the PVA film caused by the embedded sepiolites. The thermal analysis showed that the composite film with a higher content of sepiolites exhibited higher crystallinity and a higher melting temperature.
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Affiliation(s)
- So Yeon Ahn
- Department of Fiber System
Engineering, Dankook University, 126 Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea
| | - Young Seok Song
- Department of Fiber System
Engineering, Dankook University, 126 Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea
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Gong B, Li D, Niu Z, Liu Y, Dang Z. Inhibition of pyrite oxidation using PropS-SH/sepiolite composite coatings for the source control of acid mine drainage. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:11090-11105. [PMID: 33108643 DOI: 10.1007/s11356-020-11310-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Accepted: 10/18/2020] [Indexed: 05/28/2023]
Abstract
Pyrite, as one of the most abundant sulfide minerals, can be easily oxidized to generate acid mine drainage (AMD). In the present study, a new composite passivator named PropS-SH/sepiolite (PSPT) using γ-mercaptopropyltrimethoxysilane (PropS-SH) as the main passivator and natural sepiolite particles as filler was fabricated and used to suppress the oxidation of pyrite. Electrochemical tests and chemical leaching experiments were carried out to evaluate the passivation performance of PSPT coatings with different amount of sepiolite particles on pyrite oxidation. The results showed that the addition of appropriate sepiolite could significantly improve the inhibition ability of PropS-SH against pyrite oxidation. However, excessive addition of sepiolite particles weakened the inhibition ability of the PSPT coatings owing to aggregations of sepiolite. Additionally, the coating mechanism of PSPT on pyrite was also proposed based on the characterization of FTIR, XPS, and 29SiNMR measurements, which indicated that sepiolite particles could be embedded in PropS-SH network through oxygen bridges, thus improving the stability of the composite coatings.
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Affiliation(s)
- Baolin Gong
- Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan, 411105, China
| | - Dejian Li
- Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan, 411105, China
| | - Zheng Niu
- Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan, 411105, China
| | - Yun Liu
- Department of Environmental Science and Engineering, College of Environment and Resources, Xiangtan University, Xiangtan, 411105, China.
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
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Ghorbel N, Raihane M, Lahcini M, Kallel A. Interfacial characteristics of poly(ε‐caprolactone)‐
grafted
‐halloysites nanotubes bionanocomposites. POLYM ENG SCI 2021. [DOI: 10.1002/pen.25583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Mustapha Raihane
- IMED‐Lab, Faculty of Sciences and Techniques Cadi Ayyad University Marrakech Morocco
| | - Mohammed Lahcini
- IMED‐Lab, Faculty of Sciences and Techniques Cadi Ayyad University Marrakech Morocco
- Mohammed VI Polytechnic University Ben Guerir Morocco
| | - Ali Kallel
- LaMaCOP, Faculty of sciences of Sfax Sfax Tunisia
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Calderaro MP, Pinheiro IF, Holanda Saboya Souza D, Clepf Pagotto C, Morales AR. PBAT
/hybrid nanofillers composites—Part 2: Morphological, thermal and rheological properties. J Appl Polym Sci 2020. [DOI: 10.1002/app.50414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | | | - Diego Holanda Saboya Souza
- Institute of Macromolecules Professor Eloísa Mano (IMA) Federal University of Rio de Janeiro (UFRJ) Rio de Janeiro Brazil
| | | | - Ana Rita Morales
- School of Chemical Engineering (FEQ) University of Campinas (UNICAMP) Campinas Brazil
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Influence of the Solidification Process on the Mechanical Properties of Solid-State Drawn PCL/Sepiolite Nanocomposite Tapes. FIBERS 2020. [DOI: 10.3390/fib8110070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this research, poly(ε-caprolactone) (PCL) was melt-mixed with sepiolite nanoclays in a twin-screw extruder. In a subsequent step, the extruded films were drawn in the solid state to highly oriented nanocomposite films or tapes. A twin-screw extruder equipped with a Sultzer mixer for improved mixing in combination with a bench top drawing unit was used to prepare oriented nanocomposite tapes of different sepiolite loading and draw ratios. In order to study the influence of the solidification step on the drawability of the materials, different cooling procedures were applied prior to drawing. Optical microscopy images showed that slow or fast solidification using different chill rolls settings (open or closed) for the cast films resulted in different morphological conditions for subsequent drawing. The addition of sepiolite nanofillers led to nucleation and faster crystallization kinetics and oriented tapes which deformed by homogenous deformation rather than necking. The addition of sepiolite significantly improved the mechanical properties of both undrawn and drawn PCL tapes and Young’s modulus (1.5 GPa) and tensile strength (360 MPa) for composites based on 4 wt% sepiolite were among the highest ever reported for PCL nanocomposites. Interestingly, samples cooled with open chill rolls (slow crystallization) showed the highest modulus while solidification with closed rolls (fast crystallization) showed the highest tensile strength after drawing.
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Saraydın D, Öztop HN, Hepokur C. Nanocomposite smart hydrogel based on sepiolite nanochannels/N-isopropyl acrylamide/itaconic acid/acrylamide for invertase immobilization. POLYM-PLAST TECH MAT 2020. [DOI: 10.1080/25740881.2020.1784223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Dursun Saraydın
- Science Faculty, Chemistry Department, Sivas Cumhuriyet University, Sivas, Turkey
| | - H. Nursevin Öztop
- Science Faculty, Biochemistry Department, Sivas Cumhuriyet University, Sivas, Turkey
| | - Ceylan Hepokur
- Pharmacy Faculty, Department of Biochemistry, Sivas Cumhuriyet University, Sivas, Turkey
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Abstract
Abstract
In the current study, the isomerization of geraniol over a natural sepiolite as a catalyst was investigated and optimized. Prior to application in the isomerization process, the physical and chemical properties of sepiolite were characterized using a battery of instrumental techniques, including XRD, nitrogen adsorption at 77 K, SEM, EDXRF, UV–Vis and FT-IR. Results indicated that geraniol isomerization is very complicated due to the large number of reactions taking place. The catalytic studies showed that the main reaction products were β-pinene, ocimenes, linalool, nerol, citrals, thunbergol and isocembrol; all chemical products with commercial applications. The quantity of each of these products depended on the temperature, catalyst content and reaction time employed in the isomerization process. During the current study, these parameters were varied in a step-wise approach over the ranges 80–150 °C (temperature), 5–15 wt% catalyst content and reaction time of 15–1440 min. As linalool is one of the most commercially important reaction products, the geraniol isomerization method was studied to identify conditions producing the highest selectivity for this compound. The most beneficial conditions for geraniol conversion and linalool formation were established as a temperature of 120 °C, catalyst content of 10 wt% and a reaction time of 3 h.
Graphic Abstract
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Surface grafting of sepiolite with a phosphaphenanthrene derivative and its flame-retardant mechanism on PLA nanocomposites. Polym Degrad Stab 2019. [DOI: 10.1016/j.polymdegradstab.2019.04.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Huang D, Zhang Z, Ma Z, Quan Q. Effect of Natural Nanostructured Rods and Platelets on Mechanical and Water Resistance Properties of Alginate-Based Nanocomposites. Front Chem 2019; 6:635. [PMID: 30619839 PMCID: PMC6305989 DOI: 10.3389/fchem.2018.00635] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 12/07/2018] [Indexed: 11/19/2022] Open
Abstract
A series of biopolymer-based nanocomposite films were prepared by incorporating natural one-dimensional (1D) palygorskite (PAL) nanorods, and two-dimensional (2D) montmorillonite (MMT) nanoplatelets into sodium alginate (SA) film by a simple solution casting method. The effect of different dimensions of nanoclays on the mechanical, water resistance, and light transmission properties of the SA/PAL or MMT nanocomposite films were studied. The field-emission scanning electron microscopy (FE-SEM) result showed that PAL can disperse better than MMT in the SA matrix in the case of the same addition amount. The incorporation of both PAL and MMT into the SA film can enhance the tensile strength (TS) and water resistance capability of the film. At a high content of nanoclays, the SA/PAL nanocomposite film shows relatively higher TS, and better water resistance than the SA/MMT nanocomposite film. The SA/MMT nanocomposite films have better light transmission than SA/PAL nanocomposite film at the same loading amount of nanoclays. These results demonstrated that 1D PAL nanorods are more suitable candidate of inorganic filler to improve the mechanical and water resistance properties of biopolymers/nanoclays nanocomposites.
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Affiliation(s)
- Dajian Huang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou, China
| | - Zhuo Zhang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou, China
| | - Zonghong Ma
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou, China
| | - Qiling Quan
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou, China
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Arrigo R, Antonioli D, Lazzari M, Gianotti V, Laus M, Montanaro L, Malucelli G. Relaxation Dynamics in Polyethylene Glycol/Modified Hydrotalcite Nanocomposites. Polymers (Basel) 2018; 10:E1182. [PMID: 30961107 PMCID: PMC6290601 DOI: 10.3390/polym10111182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 10/16/2018] [Accepted: 10/20/2018] [Indexed: 11/16/2022] Open
Abstract
Polyethylene glycol-based nanocomposites containing an organo-modified hydrotalcite with loadings ranging from 0.5 to 5 wt.% were prepared by melt mixing performed just above the melting point of the polymer matrix. In these conditions, the dispersion of the nanofiller within the polymer matrix was quite homogeneous as revealed by TEM analyses. The effect of various thermal treatments and filler loadings was thoroughly investigated by means of rheological, morphological and gas chromatography-mass spectrometry, hyphenated to thermogravimetry analysis tests. Unfilled polyethylene glycol exhibited a continuous decrease in complex viscosity upon heating. In contrast, the complex viscosity of nanocomposites containing nanofiller loadings higher than 1 wt.% showed first a decrease, followed by an increase in the complex viscosity as the temperature increases, exhibiting a minimum between 130 and 140 °C. Annealing at 180 °C for different times further increased the viscosity of the system. This unusual behavior was explained by the occurrence of grafting reactions between the ⁻OH terminal groups of the polyethylene glycol chains and the hydroxyl groups of the organo-modified filler, thus remarkably affecting the relaxation dynamics of the system.
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Affiliation(s)
- Rossella Arrigo
- Department of Applied Science and Technology and Local INSTM Unit, Politecnico di Torino, Viale T. Michel 5, 15121 Alessandria, Italy.
| | - Diego Antonioli
- Department of Science and Technological Innovation, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Massimo Lazzari
- Departamento de Química Física, Facultade de Química, and Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - Valentina Gianotti
- Department of Science and Technological Innovation, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Michele Laus
- Department of Science and Technological Innovation, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Laura Montanaro
- Department of Applied Science and Technology and Local INSTM Unit, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy.
| | - Giulio Malucelli
- Department of Applied Science and Technology and Local INSTM Unit, Politecnico di Torino, Viale T. Michel 5, 15121 Alessandria, Italy.
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