Titica Vine Fiber (Heteropsis flexuosa): A Hidden Amazon Fiber with Potential Applications as Reinforcement in Polymer Matrix Composites

Cunha, Juliana dos Santos Carneiro da; Nascimento, Lúcio Fábio Cassiano; Luz, Fernanda Santos da; Filho, Fábio da Costa Garcia; Oliveira, Michelle Souza; Monteiro, Sérgio Neves

doi:10.3390/jcs6090251

Cited by 15 publications

(9 citation statements)

References 78 publications

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“…This core can be further split along the vine's length into slender pieces that retain strength and flexibility [15]. They were included in the market as excellent raw materials due to their economic importance for manufacturing various products, such as handicrafts, baskets, and furniture [16]. Knowledge about the species for application in technology is still scarce and a great challenge for Brazilian researchers, who must thoroughly know the quality of regional species.…”

Section: Introductionmentioning

confidence: 99%

Developing a Biodegradable Film for Packaging with Lignocellulosic Materials from the Amazonian Biodiversity

Silva,

Batista,

Scatolino

et al. 2023

Polymers

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The development of packaging films made from renewable raw materials, which cause low environmental impact, has gained attention due to their attractive properties, which have become an exciting option for synthetic films. In this study, cellulose micro/nanofibrils (MFC/NFC) films were produced with forest residues from the Amazon region and evaluated for their potential to generate alternative packaging to traditional plastic packaging. The MFC/NFC were obtained by mechanical fibrillation from fibers of açaí seeds (Euterpe oleracea), titica vine (Heteropsis flexuosa), and commercial pulps of Eucalyptus sp. for comparison. The fibrillation of the titica vine culminated in higher energy expenditure on raw materials. The açaí films showed a higher tensile strength (97.2 MPa) compared to the titica films (46.2 MPa), which also showed a higher permeability rate (637.3 g day−1 m−2). Films of all raw materials scored the highest in the grease resistance test (n° 12). The films produced in the study showed potential for use in packaging for light and low moisture products due to their adequate physical, mechanical, and barrier characteristics. New types of pre-treatments or fibrillation methods ecologically correct and viable for reducing energy consumption must be developed, mainly for a greater success of titica vine fibrillation at the nanoscale.

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Section: Introductionmentioning

confidence: 99%

Developing a Biodegradable Film for Packaging with Lignocellulosic Materials from the Amazonian Biodiversity

Silva,

Batista,

Scatolino

et al. 2023

Polymers

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“…As a result of the wetting effects and an increase in the contact area, the skin-electrode impedance is greatly reduced. Our new electrodes performed similarly to regular gel electrodes on the hairy scalp, as shown by EEG signal measurements and experiments using steady-state visual evoked potentials in a few patients [20]. With the support of the Fe-Mg oxide composite, homogeneous absorbent nanoparticles used with graphene nanoplates to improve the efficiency of electrodes [21].…”

Section: Introductionmentioning

confidence: 76%

“…It is vital to bear in mind that not all printing methods are compatible with flat textile designs. Despite the increasing attention paid to 3D-printed fibers and textile structures [20], these technologies are still in the experimental stages and often fail to replicate the qualities of traditional textiles. Nonwoven may be isotropic among the planar fabric structures, in contrast to the highly anisotropic woven and knit fabric.…”

Section: Flexible Architectures For Printed Electrode Fabricationmentioning

confidence: 99%

Nanocomposite-Based Electrode Structures for EEG Signal Acquisition

et al. 2022

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Objective: To fabricate a lightweight, breathable, comfortable, and able to contour to the curvilinear body shape, electrodes built on a flexible substrate are a significant growth in wearable health monitoring. This research aims to create a GNP/FE electrode-based EEG signal acquisition system that is both efficient and inexpensive. Methodology: Three distinct electrode concentrations were developed for EEG signal acquisition, three distinct electrode concentrations (1.5:1.5, 2:1, and 3:0). The high strength-to-weight ratio to form the tribofilm in the fabrication of the electrode will provide good efficiency. The EEG signal is first subjected to a wavelet transform, which serves as a preliminary analysis. The use of biopotential signals in wearable systems as biofeedback or control commands is expected to substantially impact point-of-care health monitoring systems, rehabilitation devices, human–computer/machine interfaces (HCI/HMI), and brain–computer interfaces (BCIs). The graphene oxide (GO), glycerol (GL), and polyvinyl alcohol (PVA) GO/GL/PVA plastic electrodes were measured and compared to that of a commercially available electrode using the biopic equipment. The GO/GL/PVA plastic electrode was able to detect EEG signals satisfactorily after being used for two months, demonstrating good conductivity and lower noise than the commercial electrode. The GO/GL/PVA nanocomposite mixture was put into the electrode mold as soon as it was ready and then rapidly chilled. Results: The quality of an acquired EEG signal could be measured in several ways including by its error percentage, correlation coefficient, and signal-to-noise ratio (SNR). The fabricated electrode yield detection ranged from 0.81 kPa−1 % to 34.90 kPa−1%. The performance was estimated up to the response of 54 ms. Linear heating at the rate of 40 °C per minute was implemented on the sample ranges from 0 °C to 240 °C. During the sample electrode testing in EEG signal analysis, it obtained low impedance with a good quality of signal acquisition when compared to a conventional wet type of electrode. Conclusions: A large database was frequently built from all of the simulated signals in MATLAB code. Through the experiment, all of the required data were collected, checked against all other signals, and proven that they were accurate representations of the intended database. Evidence suggests that graphene nanoplatelets (GNP) hematite (FE2O3) polyvinylidene fluoride (PVDF) GNP/FE2O3@PVDF electrodes with a 3:0 concentration yielded the best outcomes.

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“…Before producing the composites, the fibers were cleaned in running water and dried in an oven at 60 • C for 24 h [33]. Then, composites with 0, 10, 20, 30, and 40 vol% TVFs, preferably aligned and incorporated into epoxy resin (TVF/E), were prepared using a hand lay-up process, in which a compression force of 5 MPa was applied in a Sky hydraulic press, São José do Rio Preto, Brazil, at room temperature (RT) for 24 h. The dimensions of the metallic mold used for processing were 150 × 120 × 11.9 mm.…”

Section: Methodsmentioning

confidence: 99%

Ballistic Behavior of Epoxy Composites Reinforced with Amazon Titica Vine Fibers (Heteropsis flexuosa) in Multilayered Armor System and as Stand-Alone Target

da Cunha,

Nascimento,

Costa

et al. 2023

Polymers

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Seeking to improve personal armor equipment by providing mobility and resistance to penetration, this research aimed to explore the potential of sustainable materials in order to assess their ability in ballistic applications. Titica vine fibers (TVFs) extracted from aerial roots of Heteropsis flexuosa from the Amazon region were incorporated at 10, 20, 30, and 40 vol% into an epoxy matrix for applications in ballistic multilayered armor systems (MASs) and stand-alone tests for personal protection against high-velocity 7.62 mm ammunition. The back-face signature (BFS) depth measured for composites with 20 and 40 vol% TVFs used as an intermediate layer in MASs was 25.6 and 32.5 mm, respectively, and below the maximum limit of 44 mm set by the international standard. Fracture mechanisms found by scanning electron microscopy (SEM) attested the relevance of increasing the fiber content for applications in MASs. The results of stand-alone tests showed that the control (0 vol%) and samples with 20 vol% TVFs absorbed the highest impact energy (Eabs) (212–176 J), and consequently displayed limit velocity (VL) values (213–194 m/s), when compared with 40 vol% fiber composites. However, the macroscopic evaluation found that, referring to the control samples, the plain epoxy shattered completely. In addition, for 10 and 20 vol% TVFs, the composites were fragmented or exhibited delamination fractures, which compromised their physical integrity. On the other hand, composites with 30 and 40 vol% TVFs, whose Eabs and VL varied between 166–130 J and 189–167 m/s, respectively, showed the best physical stability. The SEM images indicated that for composites with 10 and 20 vol% TVFs, the fracture mode was predominantly brittle due to the greater participation of the epoxy resin and the discrete action of the fibers, while for composites with 30 and 40 vol% TVFs, there was activation of more complex mechanisms such as pullout, shearing, and fiber rupture. These results indicate that the TVF composite has great potential for use in bulletproof vests.

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Titica Vine Fiber (Heteropsis flexuosa): A Hidden Amazon Fiber with Potential Applications as Reinforcement in Polymer Matrix Composites

Cited by 15 publications

References 78 publications

Developing a Biodegradable Film for Packaging with Lignocellulosic Materials from the Amazonian Biodiversity

Developing a Biodegradable Film for Packaging with Lignocellulosic Materials from the Amazonian Biodiversity

Nanocomposite-Based Electrode Structures for EEG Signal Acquisition

Ballistic Behavior of Epoxy Composites Reinforced with Amazon Titica Vine Fibers (Heteropsis flexuosa) in Multilayered Armor System and as Stand-Alone Target

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