Design of Alginate-Based Bionanocomposites with Electrical Conductivity for Active Food Packaging

Alves, Zélia; Ferreira, N.M.; Mendo, Sónia; Ferreira, Paula; Nunes, Cláudia

doi:10.3390/ijms22189943

Cited by 23 publications

(7 citation statements)

References 69 publications

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“…Table 2 presents the polymer composite materials prepared using the rGO reduced by the green methodologies listed in Table 1. The applications found for these materials were corrosion protection [29,49,50], gas diffusion barriers [47], sensing [21], supercapacitors [35], environmental remediation [39], and food packaging [9,94]. Recently, we revised the use of graphene derivatives in biopolymer composite nanostructures for food packaging applications, which is an example of application where these green carbon nanostructures can be employed [95].…”

Section: Polymer Composites Containing Rgomentioning

confidence: 99%

Green Carbon Nanostructures for Functional Composite Materials

Barra

Nunes

Ruiz‐Hitzky

et al. 2022

IJMS

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Carbon nanostructures are widely used as fillers to tailor the mechanical, thermal, barrier, and electrical properties of polymeric matrices employed for a wide range of applications. Reduced graphene oxide (rGO), a carbon nanostructure from the graphene derivatives family, has been incorporated in composite materials due to its remarkable electrical conductivity, mechanical strength capacity, and low cost. Graphene oxide (GO) is typically synthesized by the improved Hummers’ method and then chemically reduced to obtain rGO. However, the chemical reduction commonly uses toxic reducing agents, such as hydrazine, being environmentally unfriendly and limiting the final application of composites. Therefore, green chemical reducing agents and synthesis methods of carbon nanostructures should be employed. This paper reviews the state of the art regarding the green chemical reduction of graphene oxide reported in the last 3 years. Moreover, alternative graphitic nanostructures, such as carbons derived from biomass and carbon nanostructures supported on clays, are pointed as eco-friendly and sustainable carbonaceous additives to engineering polymer properties in composites. Finally, the application of these carbon nanostructures in polymer composites is briefly overviewed.

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Section: Polymer Composites Containing Rgomentioning

confidence: 99%

Green Carbon Nanostructures for Functional Composite Materials

Barra

Nunes

Ruiz‐Hitzky

et al. 2022

IJMS

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“…This characteristic has led to the improvement of mechanical properties, barrier properties, cohesiveness, and rigidity [ 22 , 23 ]. By increasing the concentration of cations during the gelation of alginates, a dense structure with reduced porosity is shaped and a decrease in the water content or the gel permeability appears [ 22 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Active Food Packaging Films Based on Gelatin-Sodium Alginate Containing Beetroot Peel Extract

et al. 2022

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Currently, the exploration of natural colorants from vegetal waste has gained particular attention. Furthermore, incorporation of these natural sources into biopolymers is an encouraging environmentally friendly approach to establishing active films with biological activities for food packaging. The present study developed bioactive antioxidant films based on gelatin-sodium alginate (NaAlg) incorporated with aqueous beetroot peel extract (BPE). Firstly, the effects of combining gelatin-NaAlg and BPE at 0.25, 0.5, and 1% on the mechanical, physical, antioxidant, and antibacterial properties of the films were analyzed. With increasing BPE, mechanico-physical properties and antioxidant and anti-foodborne pathogen capacities were enhanced. Likewise, when added to gelatin-NaAlg films, BPE remarkably increased the instrumental color properties. Moreover, during 14 days of storage at 4 °C, the impact of gelatin-NaAlg coating impregnated with BPE on microbial and chemical oxidation and on the sensory characteristics of beef meat samples was periodically assessed. Interestingly, by the end of the storage, BPE at 1% limited the microbial deterioration, enhanced the instrumental color, delayed chemical oxidation, and improved sensory traits. By practicing chemometrics tools (principal component analysis and heat maps), all data provided valuable information for categorizing all samples regarding microbiological and oxidative properties, sensory features, and instrumental color. Our findings revealed the ability of gelatin-NaAlg with BPE as an antioxidant to be employed as food packaging for meat preservation.

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“…Compared with other studies, [30][31][32][33][34][35][36][37][38][39][40] the composites modified by this method still have better electrical conductivity as shown in Figure 8c, which also indicates that the modification using this method is feasible for the preparation of composites with high electrical conductivity.…”

Section: Characterization Of Electrical Properties Of Ep Compositesmentioning

confidence: 67%

Effect of N–Ni coordination bond on the electrical and thermal conductivity of epoxy resin/nickel‐coated graphite

Zhang,

et al. 2023

J of Applied Polymer Sci

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The agglomeration of nickel‐coated graphite (NCG) in epoxy resin (EP) composites leads to low electrical conductivity of EP composites, which limits their development in electronic devices and multilayer circuits. In order to improve the electrical and thermal conductivity of NCG/EP composites, ethylenediamine (EDA) was used to modify NCG and compared with pure NCG‐filled EP composites. It was found that the conductive effect of modified composites with 20 wt% filler is better than that of unmodified composites with 40 wt% filler. The results of Fourier transform infrared spectroscopy and thermogravimetric analysis of EDA‐modified NCG (ENCG) showed that a coordination adsorption reaction occurred between EDA and NCG, forming N–Ni coordination bonds. When the filling amount of ENCG was 40 wt%, the conductivity and thermal conductivity of the composite are improved most significantly. The volume resistivity was reduced from 2.636 to 0.109 Ω cm, a decrease of 95.85%, and the thermal conductivity was improved from 0.517 to 0.968 W/(m K), an increase of 87.23%, respectively. Meanwhile, ENCG has better dispersion in the EP matrix than NCG.

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Design of Alginate-Based Bionanocomposites with Electrical Conductivity for Active Food Packaging

Cited by 23 publications

References 69 publications

Green Carbon Nanostructures for Functional Composite Materials

Green Carbon Nanostructures for Functional Composite Materials

Novel Active Food Packaging Films Based on Gelatin-Sodium Alginate Containing Beetroot Peel Extract

Effect of N–Ni coordination bond on the electrical and thermal conductivity of epoxy resin/nickel‐coated graphite

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