Physical properties of carboxymethyl cellulose based nano-biocomposites with Graphene nano-platelets

Ebrahimzadeh, Saeed; Ghanbarzadeh, Babak; Hamishehkar, Hamed

doi:10.1016/j.ijbiomac.2015.11.074

Cited by 57 publications

(18 citation statements)

References 29 publications

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“…In CMC-film pattern, no sharp peak was observed that indicated its complete amorphous structure. The amorphous nature of CMC films is previously reported by other studies 42,43. The blending of TONP into CMC and SPE (150, 300 and 450 mg/mL) into CMC-TiO 2 matrix caused no shift or appearance of a new peak.…”

Section: Resultssupporting

confidence: 80%

Fabrication and characterization of a titanium dioxide (TiO2) nanoparticles reinforced bio-nanocomposite containing Miswak (Salvadora persica L.) extract – the antimicrobial, thermo-physical and barrier properties

Ahmadi¹,

Tanomand²,

Kazeminava³

et al. 2019

IJN

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Objective: The microbial, physico-chemical and optical corruptions threaten a variety of foods and drugs and consequently the human biological safety and its accessible resources. The humanbeing’s tendency towards bio-based materials and natural plant-extracts led to an increase in the usage of antimicrobial biocomposites based on medicinal herbs. Miswak ( Salvadora persica L.) extract (SPE) has been proved effective for its antimicrobial and other biological activities. Therefore, in this study, titanium dioxide (TiO 2 ) nanoparticles (TONP) and SPE were applied to fabricate antimicrobial carboxymethyl cellulose (Na-CMC) based bio-nanocomposites which would simultaneously promote some thermo-physical and barrier properties. Methods: CMC-neat film (C1), CMC/TONP-2% (C2) and CMC/TONP-2% with 150, 300 and 450 mg/mL SPE (SPE150, SPE30 and SPE450, respectively) were fabricated. The physical and mechanical properties; elemental mapping analysis (MAP), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA-DTG); fourier transform infrared (FTIR), energy-dispersive X-ray (EDX) and UV-vis spectroscopies were done to further validate the results. Results: Addition of TONP (2%) improved the blocking of UV light at 280 nm while SPE-containing nanocomposites completely blocked it. FTIR, XRD and SEM confirmed the formation of homogeneous films and high miscibility of applied materials. TONP led to an increase in Young’s modulus (YM) and stress at break (SB) while SPE decreased them and enhanced the elongation to break (EB) (flexibility) of the active nanocomposites. Compared to CMC-film, the thermo-gravimetric analysis (TGA-DTG) showed a higher thermal stability for CMC/TONP and CMC/TONP/SPE nanocomposites. The EDX spectroscopy and elemental mapping analysis (MAP) proved the existence and well-distributedness of Na, K, Cl, S, Ti, F and N elements in SPE-activated nanocomposites. The pure SPE and SPE-activated nanocomposites showed a favorable antimicrobial activity against both gram-positive ( Staphylococcus aureus ) and negative ( Escherichia coli ) bacteria. Conclusion: The CMC-TiO 2 -SPE nanocomposites were homogeneously produced. Combination of TiO 2 nanoparticles and dose-dependent SPE led to an improvement of thermal stability, and high potential in antimicrobial and UV-barrier properties. These results can generally highlight the role of the fabricated antimicrobial bio-nanocomposites as a based for different applications especially in food/drug packaging or coating.

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Section: Resultssupporting

confidence: 80%

Fabrication and characterization of a titanium dioxide (TiO2) nanoparticles reinforced bio-nanocomposite containing Miswak (Salvadora persica L.) extract – the antimicrobial, thermo-physical and barrier properties

Ahmadi¹,

Tanomand²,

Kazeminava³

et al. 2019

IJN

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“…Table 2 shows the elongation at break (EB) and tensile strength (TS) values obtained for the films. CMC-based film without PA and PB presented similar EB values to those reported in another study using CMC at 1.50% (w/v) (same concentration used in the present study) [23]. The addition of PA and PB lead to a decrease of the EB values when compared to the non-enriched CMC-based film, showing significant differences (p < 0.05) for films with the highest concentration of PA (0.20% w/v) and the lowest concentrations of PB (<0.10% w/v).…”

Section: Thermal Behaviorsupporting

confidence: 88%

“…The value obtained for CMC-based film (3.36 × 10 −10 g/m s Pa) was higher than the value found by Bifani et al [27] (7.14 × 10 −11 g/m s Pa) when using CMC at 2.00% (w/v) and glycerol and sunflower oil as plasticizers (0.50% and 0.40%, v/w, respectively). However, it was lower than the WVP value (1.62 × 10 −8 g/m s Pa) achieved using CMC at 1.50% (w/v) and glycerol 0.90% (w/v) [23]. Such difference may be due to the type and amount of plasticizer used, the presence of sunflower oil, the CMC concentration and the process used to produce the film.…”

Section: Water Vapor Permeabilitymentioning

confidence: 69%

Production and physicochemical properties of carboxymethyl cellulose films enriched with spent coffee grounds polysaccharides

Ballesteros

Cerqueira

Teixeira

et al. 2018

International Journal of Biological Macromolecules

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Extracts rich in polysaccharides were obtained by alkali pretreatment (PA) or autohydrolysis (PB) of spent coffee grounds, and incorporated into a carboxymethyl cellulose (CMC)-based film aiming at the development of bio-based films with new functionalities. Different concentrations of PA or PB (up to 0.20% w/v) were added to the CMC-based film and the physicochemical properties of the final films were determined. Scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, as well as determinations of optical and mechanical properties, moisture content, solubility in water, water vapor permeability, contact angle and sorption isotherms were performed. The addition of PA or PB resulted in important changes in the properties of the CMC-based film, mainly in color and opacity. The polysaccharides incorporation significantly improved the light barrier of the film and provided an enhancement or at least a preservation in the physicochemical properties.

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“…As seen in previous studies, this phenomenon can be attributed to filler agglomeration, and consequent reduction of effective interaction between the filler and the polymer matrix, leading to an inefficient stress transfer from matrix to filler [41,43,44]. Gas permeation measurements were carried out to evaluate the physical aging in pristine PIM-1 membranes and MMMs up to 155 days, with permeability data for days 0 (fresh membranes right after preparation and methanol treatment), 35, 63, 92, 128 and 155.…”

Section: Resultsmentioning

confidence: 66%

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

Alberto

Bhavsar

Luque-Alled

et al. 2018

Journal of Membrane Science

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Physical aging of polymer of intrinsic microporosity PIM-1 is one of the major obstacles for its application as a commercial membrane material for gas separation. In this work, physical aging of PIM-1 and matrices of this same polymer containing graphene-like materials were studied.Graphene-like fillers resulted from the functionalization of graphene oxide (GO) with two alkyl chains of different lengths, using octylamine (OA) and octadecylamine (ODA), and further chemical reduction. Extents of membrane aging were evaluated through changes in gas permeability over time;the separation of gas mixtures comprising carbon dioxide and methane, which are of great interest for industrial applications such as the production of biogas or the purification of natural gas, was carried out. 50:50 vol. % CO 2 /CH 4 mixtures were used as feed and separation performance analysed for fresh membranes and at intervals of approximately a month up to 155 days. At the end of this testing period, aged PIM-1 membranes showed a CO 2 permeability of (2.0± 0.7) x 10 3 Barrer, which corresponds to a CO 2 permeability reduction of 68 % from the value obtained right after their fabrication. The addition of alkyl-functionalized GO is shown to be an efficient strategy to retard the physical aging of PIM-1 membranes; filler loadings as low as 0.05 wt.% of reduced octylfunctionalized GO showed a CO 2 permeability of (3.5 ± 0.6) x 10 3 Barrer after 5 months, which is almost three quarters higher than that of pure PIM-1 membrane aged for the same time period and represents a reduction of just 39% from its initial value. Moreover, the addition of graphene-like materials to PIM-1 does not affect its mechanical properties. Highlights Physical aging of mixed matrix membranes (MMMs) composed of PIM-1 and graphene-like materials was investigated. A binary CO 2 /CH 4 (50:50 vol.%) gas mixtures was used. Physical aging was reduced by the incorporation of reduced alkyl-functionalized graphene oxide nanosheets into PIM-1 matrices. Low filler loadings led to higher reduction in physical aging.

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Physical properties of carboxymethyl cellulose based nano-biocomposites with Graphene nano-platelets

Cited by 57 publications

References 29 publications

<p>Fabrication and characterization of a titanium dioxide (TiO2) nanoparticles reinforced bio-nanocomposite containing <em>Miswak</em> (<em>Salvadora persica</em> L.) extract – the antimicrobial, thermo-physical and barrier properties</p>

<p>Fabrication and characterization of a titanium dioxide (TiO2) nanoparticles reinforced bio-nanocomposite containing <em>Miswak</em> (<em>Salvadora persica</em> L.) extract – the antimicrobial, thermo-physical and barrier properties</p>

Production and physicochemical properties of carboxymethyl cellulose films enriched with spent coffee grounds polysaccharides

Impeded physical aging in PIM-1 membranes containing graphene-like fillers

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