1
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Almeida CL, Figueiredo LRF, Ribeiro DVM, Santos AMC, Souza EL, Oliveira KAR, Oliveira JE, Medeiros ES. Antifungal edible coatings for fruits based on zein and chitosan nanowhiskers. J Food Sci 2024; 89:404-418. [PMID: 38010738 DOI: 10.1111/1750-3841.16831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 09/21/2023] [Accepted: 10/25/2023] [Indexed: 11/29/2023]
Abstract
Fresh produce have a more limited shelf life than processed ones. Their sensory attributes such as appearance and surface texture are important features in consumer perception and liking. The decomposition of fresh produce, which is caused by enzymes, chemical reactions, and microbial infections, often caused by Colletotrichum species, is inevitable. However, it can be slowed down. Several materials have been developed for this purpose, with an emphasis on active coatings using nanomaterials. In this study, the protective effects of a zein coating containing chitosan nanowhiskers (CSW) for the maintenance of fruit quality were investigated using guava (Psidium guajava L.) as a model fruit. CSW were previously characterized, and their antifungal effects against distinct Colletotrichum species (Colletotrichum asianum, Colletotrichum tropicale, Colletotrichum gloeosporioides, and Colletotrichum brevisporum) were proven. Coatings were characterized by thermogravimetric analysis, optical profilometry, and mechanical properties. Total soluble solids, pH, mass loss, and visual inspection of uncoated and coated guava fruits were also verified during 9 days. Results show that CSW length and aspect ratio decreased for longer extraction times. A similar behavior was found for x-ray diffraction in which peak intensity decreases under the same conditions. CSW degradation (ca. 250-400°C) also depends on extraction time in which more crystalline whiskers are the most thermally stable ones. The addition of CSW did not significantly (p < 0.05) modify the homogeneity and continuity of coating but prevented microbial growth assuring fruit quality during storage. In summary, coatings protected guava fruits from post-harvest spoilage while preserving quality and extending shelf life. PRACTICAL APPLICATION: Fresh foods such as fruits and vegetables have a more limited shelf life than processed ones.
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Affiliation(s)
- Carolina L Almeida
- Postgraduate Program in Materials Science and Engineering, Federal University of Paraíba (UFPB), João Pessoa, Brazil
| | - Lucas R F Figueiredo
- Materials and Biosystems laboratory (LAMAB), Center of Technology (CT), Federal University of Paraíba (UFPB), João Pessoa-PB, Brazil
| | - Diego V M Ribeiro
- Postgraduate Program in Materials Science and Engineering, Federal University of Paraíba (UFPB), João Pessoa, Brazil
| | - Adillys M C Santos
- Center for Science and Technology in Energy and Sustainability, Federal University of Recôncavo da Bahia, Feira de Santana-BA, Brazil
| | - Evandro L Souza
- Laboratory of Food Microbiology, Department of Nutrition, Health Science Center (CCS), Federal University of Paraíba (UFPB), João Pessoa-PB, Brazil
| | - Kataryne A R Oliveira
- Laboratory of Food Microbiology, Department of Nutrition, Health Science Center (CCS), Federal University of Paraíba (UFPB), João Pessoa-PB, Brazil
| | - Juliano E Oliveira
- Materials and Biosystems laboratory (LAMAB), Department of Engineering, Federal University of Lavras, Lavras-MG, Brazil
| | - Eliton S Medeiros
- Materials and Biosystems laboratory (LAMAB), Center of Technology (CT), Federal University of Paraíba (UFPB), João Pessoa-PB, Brazil
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2
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Silva PV, Schedenffeldt BF, Medeiros ES, Molina DZ, Pagliarini MK, Salmazo PAV, Mauad M, Monquero PA, Munaro FC, Shirota LY, Silva GP, Monteiro MS, Dias RDC, Borges RPN. Selectivity of herbicides used in corn on Crotalaria ochroleuca G. Don. BRAZ J BIOL 2023; 83:e277798. [PMID: 38126645 DOI: 10.1590/1519-6984.277798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 11/22/2023] [Indexed: 12/23/2023] Open
Abstract
In the cropping systems that integrate the corn crop, the insertion of Crotalaria ochroleuca G. Don is predominantly intercropped. In this context, there is a need to observe herbicides that present selectivity for this sunn hemp species. The objective of this study was to evaluate the selectivity of pre and post-emergent herbicides on C. ochroleuca. Two field experiments were conducted in randomized blocks with four replications, involving the pre-emergence and post-emergence application of different herbicide treatments. For the pre-emergent ones, amicarbazone, atrazine and flumioxazin provided phytotoxicity higher than 90% and, consequently, low plant biomass. On the other hand, acetochlor and s-metolachlor did not cause phytotoxicity and did not affect the dry mass of crotalaria. In post-emergence, atrazine + mesotrione showed phytotoxicity >95%, followed by nicosulfuron and 2.4-D with phytotoxicity between 50-60%, whereas tembotrione did not cause injury to the plants. Thus, it was found that among the pre-emergent, acetochlor and s-metolachlor were selective, and for the emerging powders, only tembotrione was the most selective for all parameters analyzed.
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Affiliation(s)
- P V Silva
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | | | - E S Medeiros
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - D Z Molina
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - M K Pagliarini
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - P A V Salmazo
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - M Mauad
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - P A Monquero
- Universidade Federal de São Carlos - UFSCar, Araras, SP, Brasil
| | - F C Munaro
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - L Y Shirota
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - G P Silva
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - M S Monteiro
- Universidade Federal da Grande Dourados - UFGD, Dourados, MS, Brasil
| | - R D C Dias
- Universidade Federal do Triângulo Mineiro - UFTM, Iturama, MG, Brasil
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3
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Freire Filho FCM, Santos JA, Sanches AO, Medeiros ES, Malmonge JA, Silva MJ. Dielectric, electric, and piezoelectric properties of three‐phase piezoelectric composite based on castor‐oil polyurethane, lead zirconate titanate particles and multiwall carbon nanotubes. J Appl Polym Sci 2023. [DOI: 10.1002/app.53572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
| | - Josiane A. Santos
- Faculdade de Engenharia Universidade Estadual Paulista (UNESP) Ilha Solteira Brazil
| | - Alex O. Sanches
- Faculdade de Engenharia Universidade Estadual Paulista (UNESP) Ilha Solteira Brazil
| | - Eliton S. Medeiros
- Laboratory of Materials and Biosystems (LAMAB) Universidade Federal da Paraíba (UFPB), Departamento de Engenharia de Materiais João Pessoa Brazil
| | - José A. Malmonge
- Faculdade de Engenharia Universidade Estadual Paulista (UNESP) Ilha Solteira Brazil
| | - Michael J. Silva
- Faculdade de Engenharia e Ciência Universidade Estadual Paulista (UNESP) Rosana Brazil
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4
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Albuquerque AKC, Almeida DEO, Barreto JVM, Silva IDS, Jaques NG, Nepomuceno NC, Medeiros ES, Wellen RMR. Effect of hardener and catalyst contents on curing and degradation of epoxidized soybean oil. J Appl Polym Sci 2022. [DOI: 10.1002/app.53343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ananda K. C. Albuquerque
- Academic Unit of Materials Engineering Federal University of Campina Grande Campina Grande Brazil
| | - Débora E. O. Almeida
- Academic Unit of Materials Engineering Federal University of Campina Grande Campina Grande Brazil
| | - José V. M. Barreto
- Materials Engineering Department Federal University of Paraiba João Pessoa Brazil
| | - Ingridy D. S. Silva
- Academic Unit of Materials Engineering Federal University of Campina Grande Campina Grande Brazil
| | - Nichollas G. Jaques
- Academic Unit of Materials Engineering Federal University of Campina Grande Campina Grande Brazil
| | - Neymara C. Nepomuceno
- Academic Unit of Materials Engineering Federal University of Campina Grande Campina Grande Brazil
| | - Eliton S. Medeiros
- Materials Engineering Department Federal University of Paraiba João Pessoa Brazil
| | - Renate M. R. Wellen
- Academic Unit of Materials Engineering Federal University of Campina Grande Campina Grande Brazil
- Materials Engineering Department Federal University of Paraiba João Pessoa Brazil
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5
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Bassan DAZ, Santos SC, Davide LMC, Trovato VW, Medeiros ES, Santos CC, Carvalho RP. Genetic diversity of Peltophorum dubium (Spreng.) Taub. progenies from the states of Minas Gerais and Mato Grosso do Sul, Brazil. BRAZ J BIOL 2022; 82:e260760. [PMID: 35830014 DOI: 10.1590/1519-6984.260760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 06/09/2022] [Indexed: 11/21/2022] Open
Abstract
There is little information regarding the genetic diversity of native species aimed at identifying the best viable progenies for in situ and ex situ conservation. Furthermore, there is a lack of future forest improvement programs. We aimed to know the genetic diversity of 64 Peltophorum dubium (Spreng.) Taub. (Fabaceae) progenies. We determined this species' dendrometric characteristics, and when using multivariate techniques and cluster analysis, we verified the differences between the progenies and groups with less heterogeneity. The progeny and provenance test was installed in Dourados (Mato Grosso do Sul - MS), with seeds collected in three MS regions (Vale do Ivinhema, Serra de Maracaju, and Serra da Bodoquena) and in the micro-region of Lavras (Minas Gerais - MG). The experiment was conducted in an alpha lattice 8 x 8 with four repetitions. We found genetic variability among and within P. dubium populations for all height, diameter, circumference at breast height, volume, and basal area characters. We suggest that P. dubium populations have high genetic variability, which indicates possible genetic improvement through best progeny selection. The UPGMA and Tocher methods grouped the progenies into three and nine groups, respectively, in which the most divergent individuals come from MG and the Bonito region in MS. Based on morphological characters, P. dubium progenies identified as 45, 47, 49, 50, 55, and 59 from MG are the most promising, while progenies 6 and 9 were the least promising.
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Affiliation(s)
- D A Z Bassan
- Instituto de Meio Ambiente de Mato Grosso do Sul - IMASUL, Dourados, MS, Brasil
| | - S C Santos
- Universidade Federal da Grande Dourados - UFGD, Faculdade de Ciências Agrárias, Dourados, MS, Brasil
| | - L M C Davide
- Universidade Federal da Grande Dourados - UFGD, Faculdade de Ciências Agrárias, Dourados, MS, Brasil
| | - V W Trovato
- Universidade Federal da Grande Dourados - UFGD, Faculdade de Ciências Agrárias, Dourados, MS, Brasil
| | - E S Medeiros
- Universidade Federal da Grande Dourados - UFGD, Faculdade de Ciências Exatas e Tecnologia, Dourados, MS, Brasil
| | - C C Santos
- Universidade Federal da Grande Dourados - UFGD, Faculdade de Ciências Agrárias, Dourados, MS, Brasil
| | - R P Carvalho
- Instituto Federal de Mato Grosso do Sul - IFMS, Departamento de Ciências Agrárias, Ponta Porã, MS, Brasil
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6
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Ferreira KN, Oliveira RR, Castellano LRC, Bonan PRF, Carvalho OV, Pena L, Souza JR, Oliveira JE, Medeiros ES. Controlled release and antiviral activity of acyclovir-loaded PLA/PEG nanofibers produced by solution blow spinning. Biomater Adv 2022; 136:212785. [PMID: 35929318 DOI: 10.1016/j.bioadv.2022.212785] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 03/17/2022] [Accepted: 03/31/2022] [Indexed: 06/15/2023]
Abstract
Herpetic dermatitis and oral recurrent herpes (ORH) are among the most common human infections. Antiviral drugs such as acyclovir (ACV) are used in the standard treatment for ORH. Despite its therapeutic efficacy, ACV is continuously and repetitively administered in high doses. In this sense, the development of controlled release drug delivery systems such as core-shell fibers have a great potential in the treatment of ORH. In this work, poly(lactic acid)/poly(ethylene glycol) (PLA/PEG) fibers were produced by solution blow spinning (SBS) for the controlled release of ACV encapsulated in the core. PLA/PEG nanofibers containing four different blend ratios (100:0, 90:10, 80:20 and 70:30 wt%) without or with 10 wt% ACV were characterized by scanning electron microscopy (SEM), thermogravimetry (TG) and differential scanning calorimetry (DSC). The ACV release profile for 21 days was accessed by UV-Vis spectroscopy. Static water contact angles of the spun fiber mats were measured by the sessile drop method to evaluate fiber wettability upon contact with skin for transdermal release. Cytotoxicity and antiviral efficacy against Herpes simplex viruses (HSV-1) were evaluated using Vero cells. ACV addition did not impact on morphology, but slightly improved thermal stability of the fibers. Addition of hydrophilic PEG in PLA/PEG blends, however, increased drug release as confirmed by contact angle measurements and release profile. The in vitro tests showed the effectiveness of the drug delivery systems developed in reducing HSV-1 viral titer, which is related to the judicious combination of polymers used in the fibrous mats, in addition to not being cytotoxic to Vero cells. These results show the great potential of PLA/PEG solution blow-spun fibers in the controlled release of ACV to develop practical devices for the treatment of cold sores, while favoring the aesthetic appearance by covering them with a soft tissue patch (fibrous mats).
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Affiliation(s)
- Kaline N Ferreira
- Post-Graduation Program in Materials Engineering (PPCEM), Laboratory of Materials and Biosystems (LAMAB), Federal University of Paraíba (UFPB), João Pessoa, PB, 58051-900, Brazil
| | - Raonil R Oliveira
- Post-Graduation Program in Dentistry, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil
| | - Lúcio R C Castellano
- Post-Graduation Program in Dentistry, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil
| | - Paulo R F Bonan
- Post-Graduation Program in Dentistry, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil
| | - Otavio V Carvalho
- Department of Virology, Oswaldo Cruz Foundation (Fiocruz), Recife, Pernambuco 50740-465, Brazil
| | - Lindomar Pena
- Department of Virology, Oswaldo Cruz Foundation (Fiocruz), Recife, Pernambuco 50740-465, Brazil
| | - Joelma R Souza
- Post-Graduation Program in Dentistry, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil
| | - Juliano E Oliveira
- Materials and Biosystems Laboratory (LAMAB), Department of Engineering, Federal University of Lavras, Lavras, MG 37290-000, Brazil
| | - Eliton S Medeiros
- Post-Graduation Program in Materials Engineering (PPCEM), Laboratory of Materials and Biosystems (LAMAB), Federal University of Paraíba (UFPB), João Pessoa, PB, 58051-900, Brazil.
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7
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Silva VD, Santos AMC, Oliveira JE, Medeiros ES. Fruit ripeness sensors based on poly(lactic acid)/polyaniline solution blow‐spun fibrous membranes. J Appl Polym Sci 2022. [DOI: 10.1002/app.52386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Vinícius D. Silva
- Materials and Biosystems laboratory (LAMAB), Department of Materials Engineering (DEMAT) Federal University of Paraíba (UFPB) João Pessoa PB Brazil
- Materials Science and Engineering Postgraduate Program Federal University of Paraíba (UFPB) João Pessoa Brazil
| | - Adillys M. C. Santos
- Materials and Biosystems laboratory (LAMAB), Department of Materials Engineering (DEMAT) Federal University of Paraíba (UFPB) João Pessoa PB Brazil
- Center for Science and Technology in Energy and Sustainability Federal University of Recôncavo da Bahia Feira de Santana BA Brazil
| | - Juliano E. Oliveira
- Department of Engineering (DEG) Federal University of Lavras (UFLA) Lavras Brazil
| | - Eliton S. Medeiros
- Materials and Biosystems laboratory (LAMAB), Department of Materials Engineering (DEMAT) Federal University of Paraíba (UFPB) João Pessoa PB Brazil
- Materials Science and Engineering Postgraduate Program Federal University of Paraíba (UFPB) João Pessoa Brazil
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8
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Pimenta IF, Figueiredo LRF, Santos AMC, Oliveira JE, Medeiros ES. Development of controlled release fertilizer systems for
KCl
using glycerol‐based polymers. J Appl Polym Sci 2021. [DOI: 10.1002/app.51747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Igor F. Pimenta
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMAT) Federal University of Paraíba (UFPB) João Pessoa Brazil
| | - Lucas R. F. Figueiredo
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMAT) Federal University of Paraíba (UFPB) João Pessoa Brazil
| | - Adillys M. C. Santos
- Center of Science and Technology in Energy and Sustainability (CETENS) Federal University of Recôncavo da Bahia (UFRB) Feira de Santana Brazil
| | - Juliano E. Oliveira
- Department of Engineering (DEG) Federal University of Lavras (UFLA) Lavras Brazil
| | - Eliton S. Medeiros
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMAT) Federal University of Paraíba (UFPB) João Pessoa Brazil
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Dos Santos DM, Correa DS, Medeiros ES, Oliveira JE, Mattoso LHC. Advances in Functional Polymer Nanofibers: From Spinning Fabrication Techniques to Recent Biomedical Applications. ACS Appl Mater Interfaces 2020; 12:45673-45701. [PMID: 32937068 DOI: 10.1021/acsami.0c12410] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Functional polymeric micro-/nanofibers have emerged as promising materials for the construction of structures potentially useful in biomedical fields. Among all kinds of technologies to produce polymer fibers, spinning methods have gained considerable attention. Herein, we provide a recent review on advances in the design of micro- and nanofibrous platforms via spinning techniques for biomedical applications. Specifically, we emphasize electrospinning, solution blow spinning, centrifugal spinning, and microfluidic spinning approaches. We first introduce the fundamentals of these spinning methods and then highlight the potential biomedical applications of such micro- and nanostructured fibers for drug delivery, tissue engineering, regenerative medicine, disease modeling, and sensing/biosensing. Finally, we outline the current challenges and future perspectives of spinning techniques for the practical applications of polymer fibers in the biomedical field.
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Affiliation(s)
- Danilo M Dos Santos
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, São Paulo, Brazil
| | - Daniel S Correa
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, São Paulo, Brazil
| | - Eliton S Medeiros
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMAT), Federal University of Paraíba (UFPB), Cidade Universitária, 58.051-900, João Pessoa, Paraiba, Brazil
| | - Juliano E Oliveira
- Department of Engineering, Federal University of Lavras (UFLA), 37200-900, Lavras, Minas Gerais, Brazil
| | - Luiz H C Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970, São Carlos, São Paulo, Brazil
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Velo MMAC, Nascimento TRL, Scotti CK, Bombonatti JFS, Furuse AY, Silva VD, Simões TA, Medeiros ES, Blaker JJ, Silikas N, Mondelli RFL. Improved mechanical performance of self-adhesive resin cement filled with hybrid nanofibers-embedded with niobium pentoxide. Dent Mater 2019; 35:e272-e285. [PMID: 31519351 DOI: 10.1016/j.dental.2019.08.102] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 07/25/2019] [Accepted: 08/20/2019] [Indexed: 10/26/2022]
Abstract
OBJECTIVES In this study hybrid nanofibers embedded with niobium pentoxide (Nb2O5) were synthesized, incorporated in self-adhesive resin cement, and their influence on physical-properties was evaluated. METHODS Poly(D,L-lactide), PDLLA cotton-wool-like nanofibers with and without silica-based sol-gel precursors were formulated and spun into submicron fibers via solution blow spinning, a rapid fiber forming technology. The morphology, chemical composition and thermal properties of the spun fibers were characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS) and Fourier-transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC), respectively. Produced fibers were combined with a self-adhesive resin cement (RelyX U200, 3M ESPE) in four formulations: (1) U200 resin cement (control); (2) U200+1wt.% PDLLA fibers; (3) U200+1wt.% Nb2O5-filled PDLLA composite fibers and (4) U200+1wt.% Nb2O5/SiO2-filled PDLLA inorganic-organic hybrid fibers. Physical properties were assessed in flexure by 3-point bending (n=10), Knoop microhardness (n=5) and degree of conversion (n=3). Data were analyzed with One-way ANOVA and Tukey's HSD (α=5%). RESULTS Composite fibers formed of PDLLA-Nb2O5 exhibited an average diameter of ∼250nm, and hybrid PDLLA+Nb2O5/SiO2 fibers were slightly larger, ∼300nm in diameter. There were significant differences among formulations for hardness and flexural strength (p<0.05). Degree of conversion of resin cement was not affected for all groups, except for Group 4 (p<0.05). SIGNIFICANCE Hybrid reinforcement nanofibers are promising as fillers for dental materials. The self-adhesive resin cement with PDLLA+Nb2O5 and PDLLA+Nb2O5/SiO2 presented superior mechanical performance than the control group.
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Affiliation(s)
- Marilia M A C Velo
- Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil.
| | - Tatiana R L Nascimento
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil; Bio-Active Materials Group, Department of Materials, MSS Tower, The University of Manchester, Manchester, M13 9PL, UK
| | - Cassiana K Scotti
- Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil
| | | | - Adilson Y Furuse
- Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil
| | - Vinícius D Silva
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil
| | - Thiago A Simões
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil
| | - Eliton S Medeiros
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil
| | - Jonny J Blaker
- Bio-Active Materials Group, Department of Materials, MSS Tower, The University of Manchester, Manchester, M13 9PL, UK
| | - Nikolaos Silikas
- Dentistry, School of Medical Sciences, The University of Manchester, Manchester M13 9PL, UK
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Miranda KWE, Mattoso LHC, Bresolin JD, Hubinger SZ, Medeiros ES, de Oliveira JE. Polystyrene bioactive nanofibers using orange oil as an ecofriendly solvent. J Appl Polym Sci 2018. [DOI: 10.1002/app.47337] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kelvi W. E. Miranda
- Graduate Program in Biomaterials Engineering; Federal University of Lavras (UFLA); Lavras 37200-000 Minas Gerais Brazil
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Luiz H. C. Mattoso
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Joana D. Bresolin
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Silviane Z. Hubinger
- Nanotechnology National Laboratory for Agriculture (LNNA); Embrapa Instrumentation; São Carlos 13560-970 São Paulo Brazil
| | - Eliton S. Medeiros
- Materials and Biosystems Laboratory, Department of Materials Engineering (DEMAT); Federal University of Paraíba (UFPB); João Pessoa 58051-900 João Pessoa Brazil
| | - Juliano E. de Oliveira
- Department of Engineering (DEG); Federal University of Lavras (UFLA); Lavras 37200-000 Minas Gerais Brazil
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12
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Magaz A, Roberts AD, Faraji S, Nascimento TRL, Medeiros ES, Zhang W, Greenhalgh RD, Mautner A, Li X, Blaker JJ. Porous, Aligned, and Biomimetic Fibers of Regenerated Silk Fibroin Produced by Solution Blow Spinning. Biomacromolecules 2018; 19:4542-4553. [PMID: 30387602 DOI: 10.1021/acs.biomac.8b01233] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Solution blow spinning (SBS) has emerged as a rapid and scalable technique for the production of polymeric and ceramic materials into micro-/nanofibers. Here, SBS was employed to produce submicrometer fibers of regenerated silk fibroin (RSF) from Bombyx mori (silkworm) cocoons based on formic acid or aqueous systems. Spinning in the presence of vapor permitted the production of fibers from aqueous solutions, and high alignment could be obtained by modifying the SBS setup to give a concentrated channeled airflow. The combination of SBS and a thermally induced phase separation technique (TIPS) resulted in the production of macro-/microporous fibers with 3D interconnected pores. Furthermore, a coaxial SBS system enabled a pH gradient and kosmotropic salts to be applied at the point of fiber formation, mimicking some of the aspects of the natural spinning process, fostering fiber formation by self-assembly of the spinning dope. This scalable and fast production of various types of silk-based fibrous scaffolds could be suitable for a myriad of biomedical applications.
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Affiliation(s)
- Adrián Magaz
- Bio-Active Materials Group, School of Materials , The University of Manchester , Manchester , United Kingdom.,Institute of Materials Research and Engineering (IMRE) , Agency for Science, Technology and Research (A*STAR) , Singapore
| | - Aled D Roberts
- Bio-Active Materials Group, School of Materials , The University of Manchester , Manchester , United Kingdom
| | - Sheida Faraji
- Bio-Active Materials Group, School of Materials , The University of Manchester , Manchester , United Kingdom
| | - Tatiana R L Nascimento
- Laboratory of Materials and Biosystems, Department of Materials Engineering , Universidade Federal da Paraíba , João Pessoa , Brazil
| | - Eliton S Medeiros
- Laboratory of Materials and Biosystems, Department of Materials Engineering , Universidade Federal da Paraíba , João Pessoa , Brazil
| | - Wenzhao Zhang
- Bio-Active Materials Group, School of Materials , The University of Manchester , Manchester , United Kingdom
| | - Ryan D Greenhalgh
- Bio-Active Materials Group, School of Materials , The University of Manchester , Manchester , United Kingdom
| | - Andreas Mautner
- Polymer and Composite Engineering Group, Institute of Materials Chemistry and Research , University of Vienna , Vienna , Austria
| | - Xu Li
- Institute of Materials Research and Engineering (IMRE) , Agency for Science, Technology and Research (A*STAR) , Singapore.,Department of Chemistry , National University of Singapore , Singapore
| | - Jonny J Blaker
- Bio-Active Materials Group, School of Materials , The University of Manchester , Manchester , United Kingdom
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de Araújo MJG, Barbosa RC, Fook MVL, Canedo EL, Silva SML, Medeiros ES, Leite IF. HDPE/Chitosan Blends Modified with Organobentonite Synthesized with Quaternary Ammonium Salt Impregnated Chitosan. Materials (Basel) 2018; 11:E291. [PMID: 29438286 PMCID: PMC5848988 DOI: 10.3390/ma11020291] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 12/20/2017] [Accepted: 12/25/2017] [Indexed: 12/02/2022]
Abstract
In this study, blends based on a high density polyethylene (HDPE) and chitosan (CS) were successfully prepared by melt processing, in a laboratory internal mixer. The CS biopolymer content effect (up to maximum of 40%), and, the addition of bentonite clay modified with quaternary ammonium salt (CTAB) impregnated chitosan as a compatibilizing agent, on the properties of the blends was analyzed by Fourier transform-infrared spectroscopy (FT-IR), wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analyses (TG), tensile strength, and scanning electron microscopy (SEM). The use of clay modified with CTAB impregnated chitosan, employing a method developed here, improved the compatibility of HDPE with chitosan, and therefore the thermal and some of the mechanical properties were enhanced, making HDPE/chitosan blends suitable candidates for food packaging. It was possible to obtain products of synthetic polymer, HDPE, with natural polymer, chitosan, using a method very used industrially, with acceptable and more friendly properties to the environment, when compared to conventional synthetic polymers. In addition, due to the possibility of impregnated chitosan with quaternary ammonium salt exhibit higher antibacterial activity than neat chitosan, the HDPE/chitosan/organobentonite blends may be potentially applied in food containers to favor the preservation of food for a longer time in comparison to conventional materials.
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Affiliation(s)
- Maria José G de Araújo
- Graduate Program in Science and Materials Engineering, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Rossemberg C Barbosa
- Department of Materials Engineering, Federal University of Campina Grande, Campina Grande, PB 58429-900, Brazil.
| | - Marcus Vinícius L Fook
- Department of Materials Engineering, Federal University of Campina Grande, Campina Grande, PB 58429-900, Brazil.
| | - Eduardo L Canedo
- Department of Materials Engineering, Federal University of Campina Grande, Campina Grande, PB 58429-900, Brazil.
| | - Suédina M L Silva
- Department of Materials Engineering, Federal University of Campina Grande, Campina Grande, PB 58429-900, Brazil.
| | - Eliton S Medeiros
- Department of Materials Engineering, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil.
| | - Itamara F Leite
- Department of Materials Engineering, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil.
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Nepomuceno NC, Barbosa MA, Bonan RF, Oliveira JE, Sampaio FC, Medeiros ES. Antimicrobial activity of PLA/PEG nanofibers containing terpinen-4-ol against Aggregatibacter actinomycetemcomitans. J Appl Polym Sci 2017. [DOI: 10.1002/app.45782] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Neymara C. Nepomuceno
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Science and Engineering (DEMAT); Federal University of Paraíba (UFPB); João Pessoa PB 58.051-900 Brazil
| | - Mariângela A. Barbosa
- Post-Graduation Program in Dentistry (PPGO/CCS/UFPB); Federal University of Paraíba (UFPB); João Pessoa PB C58.051-900 Brazil
- Health Sciences Center (CCS); Federal University of Paraíba (UFPB); João Pessoa PB C58.051-900 Brazil
| | - Roberta F. Bonan
- Health Sciences Center (CCS); Federal University of Paraíba (UFPB); João Pessoa PB C58.051-900 Brazil
| | - Juliano E. Oliveira
- Department of Materials Engineering (DEMat); Federal University of Lavras (UFLA); Lavras-MG CEP 37200-000 Brazil
| | - Fábio C. Sampaio
- Post-Graduation Program in Dentistry (PPGO/CCS/UFPB); Federal University of Paraíba (UFPB); João Pessoa PB C58.051-900 Brazil
- Social and Clinical Dentistry Department (DCOS); Paraiba Federal University (UFPB), Bucal Biology Laboratory-LABIAL; João Pessoa PB 58.051-900 Brazil
| | - Eliton S. Medeiros
- Materials and Biosystems Laboratory (LAMAB), Department of Materials Science and Engineering (DEMAT); Federal University of Paraíba (UFPB); João Pessoa PB 58.051-900 Brazil
- Post-Graduation Program in Dentistry (PPGO/CCS/UFPB); Federal University of Paraíba (UFPB); João Pessoa PB C58.051-900 Brazil
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Bonan RF, Bonan PRF, Batista AUD, Perez DEC, Castellano LRC, Oliveira JE, Medeiros ES. Poly(lactic acid)/poly(vinyl pyrrolidone) membranes produced by solution blow spinning: Structure, thermal, spectroscopic, and microbial barrier properties. J Appl Polym Sci 2017. [DOI: 10.1002/app.44802] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Roberta F. Bonan
- Programa de Pós-Graduação em Odontologia; Universidade Federal de Pernambuco; Recife PE 50670-901 Brazil
| | - Paulo R. F. Bonan
- Centro de Ciências da Saúde (CCS); Universidade Federal da Paraíba (UFPB); João Pessoa PB 58051-900 Brazil
| | - André U. D. Batista
- Centro de Ciências da Saúde (CCS); Universidade Federal da Paraíba (UFPB); João Pessoa PB 58051-900 Brazil
| | - Danyel E. C. Perez
- Programa de Pós-Graduação em Odontologia; Universidade Federal de Pernambuco; Recife PE 50670-901 Brazil
| | - Lúcio R. C. Castellano
- Grupo de Estudos e Pesquisas em Imunologia Humana (GEPIH), Escola Técnica de Saúde da UFPB; Universidade Federal da Paraíba; João Pessoa PB 58051-900 Brazil
| | - Juliano E. Oliveira
- Departamento de Engenharia; Universidade Federal de Lavras; Lavras MG 37200-000 Brazil
| | - Eliton S. Medeiros
- Laboratório de Materiais e Biossistemas (LAMAB), Departamento de Engenharia de Materiais (DEMAT); Universidade Federal da Paraíba (UFPB) Cidade Universitária; João Pessoa PB 58.051-900 Brazil
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Medeiros ELG, Braz AL, Porto IJ, Menner A, Bismarck A, Boccaccini AR, Lepry WC, Nazhat SN, Medeiros ES, Blaker JJ. Porous Bioactive Nanofibers via Cryogenic Solution Blow Spinning and Their Formation into 3D Macroporous Scaffolds. ACS Biomater Sci Eng 2016; 2:1442-1449. [DOI: 10.1021/acsbiomaterials.6b00072] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eudes Leonnan G. Medeiros
- Materials
and Biosystems Laboratory (LAMAB), Department of Materials Engineering
(DEMat), Federal University of Paraíba (UFPB), CEP58051-900 João Pessoa-PB, Brazil
| | - Ana Letícia Braz
- Materials
and Biosystems Laboratory (LAMAB), Department of Materials Engineering
(DEMat), Federal University of Paraíba (UFPB), CEP58051-900 João Pessoa-PB, Brazil
| | - Isaque Jerônimo Porto
- Materials
and Biosystems Laboratory (LAMAB), Department of Materials Engineering
(DEMat), Federal University of Paraíba (UFPB), CEP58051-900 João Pessoa-PB, Brazil
| | - Angelika Menner
- Polymer
and Composite Engineering (PaCE) Group, Institute of Materials Chemistry
and Research, Faculty of Chemistry, University of Vienna, Währingerstr.
42, A-1090 Vienna, Austria
| | - Alexander Bismarck
- Polymer
and Composite Engineering (PaCE) Group, Institute of Materials Chemistry
and Research, Faculty of Chemistry, University of Vienna, Währingerstr.
42, A-1090 Vienna, Austria
| | - Aldo R. Boccaccini
- Institute
of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
| | - William C. Lepry
- Department
of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 0E8, Canada
| | - Showan N. Nazhat
- Department
of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 0E8, Canada
| | - Eliton S. Medeiros
- Materials
and Biosystems Laboratory (LAMAB), Department of Materials Engineering
(DEMat), Federal University of Paraíba (UFPB), CEP58051-900 João Pessoa-PB, Brazil
| | - Jonny J. Blaker
- Bio-/Active
Materials Group, School of Materials, MSS Tower, Manchester University, Manchester M13 9PL, U.K
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Santos ASF, Pereira-da-Silva MA, Oliveira JE, Mattoso LHC, Medeiros ES. Accelerated Sonochemical Extraction of Cellulose Nanowhiskers. J Nanosci Nanotechnol 2016; 16:6535-6539. [PMID: 27427748 DOI: 10.1166/jnn.2016.11039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Studies on sonochemical hydrolysis of cellulose have been suggested as an alternative route to obtaining cellulose nanoparticles. In this work, the potential use of acid hydrolysis assisted by sonication to obtain cellulose whiskers was studied. Parameters such as acid concentration, hydrolysis time and temperature were investigated to evaluate their effect on the morphological properties of the nanowhiskers, as compared to the conventional extraction process by acid hydrolysis with mechanical stirring. Morphology and degree of crystallinity of the nanowhiskers were studied by atomic force microscopy (AFM) and X-ray diffraction (XRD). Results indicated that the extraction time was reduced from about 45 min to less than 3 min using the same acid concentration and temperature used in conventional acid hydrolysis treatment. Likewise, it was possible, within the range of 30 min, to extract whiskers at room temperature or using half the concentration of acid by raising the temperature to about 80 degrees C. These are promising results towards a more economically viable and ecologically friendly extraction procedure used to obtain cellulose nanowhiskers, since both extraction time and acid concentration, used in nanowhisker extraction, were significantly reduced by replacing mechanical with sonochemical stirring.
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Souza MA, Oliveira JE, Medeiros ES, Glenn GM, Mattoso LHC. Controlled Release of Linalool Using Nanofibrous Membranes of Poly(lactic acid) Obtained by Electrospinning and Solution Blow Spinning: A Comparative Study. J Nanosci Nanotechnol 2015; 15:5628-36. [PMID: 26369129 DOI: 10.1166/jnn.2015.9692] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The controlled-release of natural plant oils such as linalool is of interest in therapeutics, cosmetics, and antimicrobial and larvicidal products. The present study reports the release characteristics of linalool encapsulated at three concentrations (10, 15 and 20 wt.%) in poly(lactic acid) nanofibrous membranes produced by electrospinning and solution blow spinning (SBS) as well as the effect of linalool on fiber morphology and structural properties. PLA nanofibrous membranes were characterized by Scanning Electron Microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and contact angle measurements. The average diameters of the electrospun and solution blow spun nanofibers were similar, ranging from 176 to 240 nm. Linalool behaved as a plasticizer to PLA decreasing the glass transition temperature (Tg), melting point (Tm) and crystallization temperature (TC) of PLA. Curves of the release of linalool at 35 °C were non-linear, showing a clear biphasic pattern consistent with one or more Fickian release components. The time required to release 50% of linalool (t1/2) decreased with increasing linalool concentration. The range in t1/2 values for SBS nanofibers was higher (291-1645s) than the t1/2 values for electrospun fibers (76-575s).
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Correa DS, Medeiros ES, Oliveira JE, Paterno LG, Mattoso LC. Nanostructured conjugated polymers in chemical sensors: synthesis, properties and applications. J Nanosci Nanotechnol 2014; 14:6509-6527. [PMID: 25924296 DOI: 10.1166/jnn.2014.9362] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Conjugated polymers are organic materials endowed with a π-electron conjugation along the polymer backbone that present appealing electrical and optical properties for technological applications. By using conjugated polymeric materials in the nanoscale, such properties can be further enhanced. In addition, the use of nanostructured materials makes possible miniaturize devices at the micro/nano scale. The applications of conjugated nanostructured polymers include sensors, actuators, flexible displays, discrete electronic devices, and smart fabric, to name a few. In particular, the use of conjugated polymers in chemical and biological sensors is made feasible owning to their sensitivity to the physicochemical conditions of its surrounding environment, such as chemical composition, pH, dielectric constant, humidity or even temperature. Subtle changes in these conditions bring about variations on the electrical (resistivity and capacitance), optical (absorptivity, luminescence, etc.), and mechanical properties of the conjugated polymer, which can be precisely measured by different experimental methods and ultimately associated with a specific analyte and its concentration. The present review article highlights the main features of conjugated polymers that make them suitable for chemical sensors. An especial emphasis is given to nanostructured sensors systems, which present high sensitivity and selectivity, and find application in beverage and food quality control, pharmaceutical industries, medical diagnosis, environmental monitoring, and homeland security, and other applications as discussed throughout this review.
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Fortaleza CMCB, Padoveze MC, Kiffer C, Barth AL, Carneiro ICRS, Rodrigues JLN, Filho LS, Mello MJG, Asensi MD, Filho PPG, Pereira MS, Rocha M, Kuchenbecker RS, Medeiros ES, Pignatari ACC. O026: Countrywide prevalence study of healthcare-associated infections in brazilian hospitals: preliminary results. Antimicrob Resist Infect Control 2013. [PMCID: PMC3688206 DOI: 10.1186/2047-2994-2-s1-o26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Padoveze MC, Fortaleza CMCB, Kiffer C, Barth AL, Carneiro ICRS, Rodrigues JLN, Filho L, Mello MJG, Asensi MD, Pereira MS, Filho PP, Rocha M, Kuchenbecker RS, Medeiros ES, Pignatari ACC. P265: Structure for prevention of healthcare-associated infection in Brazilian Hospitals. Antimicrob Resist Infect Control 2013. [PMCID: PMC3687975 DOI: 10.1186/2047-2994-2-s1-p265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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22
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Silva MJ, Sanches AO, Malmonge LF, Medeiros ES, Rosa MF, McMahan CM, Malmonge JA. Conductive Nanocomposites Based on Cellulose Nanofibrils Coated with Polyaniline-DBSA ViaIn SituPolymerization. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/masy.201100156] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Oliveira JE, Zucolotto V, Mattoso LHC, Medeiros ES. Multi-walled carbon nanotubes and poly(lactic acid) nanocomposite fibrous membranes prepared by solution blow spinning. J Nanosci Nanotechnol 2012; 12:2733-41. [PMID: 22755116 DOI: 10.1166/jnn.2012.5730] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Nanocomposite fibers based on multi-walled carbon nanotubes (MWCNT) and poly(lactic acid) (PLA) were prepared by solution blow spinning (SBS). Fiber morphology was characterized by scanning electron microscopy (SEM) and optical microscopy (OM). Electrical, thermal, surface and crystalline properties of the spun fibers were evaluated, respectively, by conductivity measurements (4-point probe), thermogravimetric analyses (TGA), differential scanning calorimetry (DSC), contact angle and X-ray diffraction (XRD). OM analysis of the spun mats showed a poor dispersion of MWCNT in the matrix, however dispersion in solution was increased during spinning where droplets of PLA in solution loaded with MWCNT were pulled by the pressure drop at the nozzle, producing PLA fibers filled with MWCNT. Good electrical conductivity and hydrophobicity can be achieved at low carbon nanotube contents. When only 1 wt% MWCNT was added to low-crystalline PLA, surface conductivity of the composites increased from 5 x 10(-8) to 0.46 S/cm. Addition of MWCNT can slightly influence the degree of crystallinity of PLA fibers as studied by XRD and DSC. Thermogravimetric analyses showed that MWCNT loading can decrease the onset degradation temperature of the composites which was attributed to the catalytic effect of metallic residues in MWCNT. Moreover, it was demonstrated that hydrophilicity slightly increased with an increase in MWCNT content. These results show that solution blow spinning can also be used to produce nanocomposite fibers with many potential applications such as in sensors and biosensors.
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Affiliation(s)
- Juliano E Oliveira
- PPGCEM, Departamento de Engenharia de Materials (DEMA), Universidade Federal de São Carlos (UFSCAR), Rodovia Washington Luis, km 235 - Monjolinho, 13.565-905 São Carlos-SP, Brazil
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Oliveira JE, Moraes EA, Costa RGF, Afonso AS, Mattoso LHC, Orts WJ, Medeiros ES. Nano and submicrometric fibers of poly(D,L-lactide) obtained by solution blow spinning: Process and solution variables. J Appl Polym Sci 2011. [DOI: 10.1002/app.34410] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Auad ML, Richardson T, Orts WJ, Medeiros ES, Mattoso LHC, Mosiewicki MA, Marcovich NE, Aranguren MI. Polyaniline-modified cellulose nanofibrils as reinforcement of a smart polyurethane. POLYM INT 2010. [DOI: 10.1002/pi.3004] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Picciani PHS, Soares BG, Medeiros ES, de Souza FG, Wood DF, Orts WJ, Mattoso LHC. Macromol. Theory Simul. 9/2009. MACROMOL THEOR SIMUL 2009. [DOI: 10.1002/mats.200990016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Picciani PHS, Soares BG, Medeiros ES, de Souza FG, Wood DF, Orts WJ, Mattoso LHC. Electrospinning of Polyaniline/Poly(Lactic Acid) Ultrathin Fibers: Process and Statistical Modeling using a Non-Gaussian Approach. MACROMOL THEOR SIMUL 2009. [DOI: 10.1002/mats.200900053] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Rosa MF, Chiou BS, Medeiros ES, Wood DF, Williams TG, Mattoso LHC, Orts WJ, Imam SH. Effect of fiber treatments on tensile and thermal properties of starch/ethylene vinyl alcohol copolymers/coir biocomposites. Bioresour Technol 2009; 100:5196-5202. [PMID: 19560341 DOI: 10.1016/j.biortech.2009.03.085] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Revised: 03/12/2009] [Accepted: 03/12/2009] [Indexed: 05/28/2023]
Abstract
Coir fibers received three treatments, namely washing with water, alkali treatment (mercerization) and bleaching. Treated fibers were incorporated in starch/ethylene vinyl alcohol copolymers (EVOH) blends. Mechanical and thermal properties of starch/EVOH/coir biocomposites were evaluated. Fiber morphology and the fiber/matrix interface were further characterized by scanning electron microscopy (SEM). All treatments produced surface modifications and improved the thermal stability of the fibers and consequently of the composites. The best results were obtained for mercerized fibers where the tensile strength was increased by about 53% as compared to the composites with untreated fibers, and about 33.3% as compared to the composites without fibers. The mercerization improved fiber-matrix adhesion, allowing an efficient stress transfer from the matrix to the fibers. The increased adhesion between fiber and matrix was also observed by SEM. Treatment with water also improved values of Young's modulus which were increased by about 75% as compared to the blends without the fibers. Thus, starch/EVOH blends reinforced with the treated fibers exhibited superior properties than neat starch/EVOH.
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Affiliation(s)
- Morsyleide F Rosa
- Embrapa Agroindústria Tropical, Rua Dra Sara Mesquita, 2270, 60511-110, Fortaleza, CE, Brazil
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Medeiros ES, Glenn GM, Klamczynski AP, Orts WJ, Mattoso LHC. Solution blow spinning: A new method to produce micro- and nanofibers from polymer solutions. J Appl Polym Sci 2009. [DOI: 10.1002/app.30275] [Citation(s) in RCA: 408] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Mattoso LHC, Medeiros ES, Baker DA, Avloni J, Wood DF, Orts WJ. Electrically conductive nanocomposites made from cellulose nanofibrils and polyaniline. J Nanosci Nanotechnol 2009; 9:2917-2922. [PMID: 19452949 DOI: 10.1166/jnn.2009.dk24] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Electrically conductive nanocomposites from cellulose nanofibrils (CNF) were successfully produced by in situ polymerization of aniline onto CNF, and studied by open circuit potential (Voc), four probe direct current (dc) electrical conductivity, ultraviolet-visible (UV-Vis) spectroscopy and scanning electron microscopy (SEM). The oxidative polymerization of aniline using ammonium peroxydisulfate in hydrochloric acid aqueous solutions was realized by the addition of nanofibrils leading to an aqueous suspension of CNF coated with polyaniline (PANI). This procedure lead to stable, green suspensions of CNF coated with PANI in the emeraldine oxidation state as demonstrated by Voc and UV-Vis analyses. Electrically conductive films of this cellulose nanocomposite could be cast from aqueous solutions with conductivity close to the conducting polymer, yet with the potential for more useful flexible films.
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Affiliation(s)
- L H C Mattoso
- Laboratório Nacional de Nanotecnologia Aplicada ao Agronegócio, Embrapa Instrumentação Agropecuária, Rua XV de Novembro, 1452, São Carlos-SP 13560-970, Brazil
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Picciani PHS, Medeiros ES, Pan Z, Orts WJ, Mattoso LHC, Soares BG. Development of conducting polyaniline/poly(lactic acid) nanofibers by electrospinning. J Appl Polym Sci 2009. [DOI: 10.1002/app.29447] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Medeiros ES, Gregório R, Martinez RA, Mattoso LHC. A Taste Sensor Array Based on Polyaniline Nanofibers for Orange Juice Quality Assessment. ACTA ACUST UNITED AC 2009. [DOI: 10.1166/sl.2009.1005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Medeiros ES, Mattoso LHC, Bernardes-Filho R, Wood DF, Orts WJ. Self-assembled films of cellulose nanofibrils and poly(o-ethoxyaniline). Colloid Polym Sci 2008. [DOI: 10.1007/s00396-008-1887-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Medeiros ES, Mattoso LH, Offeman RD, Wood DF, Orts WJ. Effect of relative humidity on the morphology of electrospun polymer fibers. CAN J CHEM 2008. [DOI: 10.1139/v08-029] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The effect of relative humidity on the morphology of electrospun fibers of poly(vinyl alcohol), poly(methyl methacrylate), poly(vinyl chloride), polystyrene, and poly(lactic acid) dissolved in solvents such as toluene, N,N-dimethylformamide, 2,2,2-trifluoroethanol, and deionized water was studied by scanning electron microscopy to investigate the factors that may contribute to pore formation. Results showed that the presence of pores depends on factors such as the type of polymers used, the polymer–solvent combination, molecular weight, and the size of the electrospun structure. The final morphology developed implies a competition between the dynamics of phase separation and the rate of solvent evaporation. In addition, continuous solvent evaporation and constant stretching owing to the electric potential difference give rise to the final shape of porous electrospun fibers.Key words: electrospinning, relative humidity, porous fibers, polymers.
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Rosa MF, Chiou BS, Medeiros ES, Wood DF, Mattoso LHC, Orts WJ, Imam SH. Biodegradable composites based on starch/EVOH/glycerol blends and coconut fibers. J Appl Polym Sci 2008. [DOI: 10.1002/app.29062] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
As propriedades tênseis de compósitos de matriz poliéster, reforçados por fibras curtas de sisal foram determinadas em função do comprimento, teor e orientação das fibras. Os resultados mostram que, para os compósitos investigados, a resistência à tração aumentou com o comprimento das fibras (5 – 45 mm), atingiu um plateau (45 – 55 mm) e então decresceu (55 – 75 mm) enquanto os valores de módulo e de alongamento na ruptura não dependiam do comprimento das fibras. A resistência à tração dos compósitos aumentou com o teor de fibras até 50% em peso e, a partir daí, tendeu a decrescer. A resistência à tração de compósitos reforçados por fibras orientadas e testados longitudinalmente ao reforço foi 10 vezes maior do que a sua resistência transversal e 3 vezes maior do que a resistência de compósitos reforçados por fibras dispostas ao acaso.
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