scholarly journals Screening of Nanocellulose from Different Biomass Resources and Its Integration for Hydrophobic Transparent Nanopaper

Molecules ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 227 ◽  
Author(s):  
Yanran Qi ◽  
Hao Zhang ◽  
Dandan Xu ◽  
Zaixin He ◽  
Xiya Pan ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Food Packaging ◽  
Electronic Device ◽  
Light Transmittance ◽  
Plastic Film ◽  
Biomass Waste ◽  
Transparent Plastic ◽  
Water Contact ◽  
Amorpha Fruticosa ◽  
Biomass Resources

Petroleum-based plastics, such as PP, PE, PVC, etc., have become an important source of environmental pollution due to their hard degradation, posing a serious threat to the human health. Isolating nanocellulose from abundant biomass waste resources and further integrating the nanocellulose into hydrophobic transparent film (i.e., nanopaper), to replace the traditional nondegradable plastic film, is of great significance for solving the problem of environmental pollution and achieving sustainable development of society. This study respectively extracted nanocellulose from the branches of Amorpha fruticosa Linn., wheat straw, and poplar residues via combined mechanical treatments of grinding and high-pressure homogenization. Among them, the nanocellulose derived from the Amorpha fruticosa has a finer structure, with diameter of about 10 nm and an aspect ratio of more than 500. With the nanocellulose as building block, we constructed hydrophilic nanopaper with high light transmittance (up to 90%) and high mechanical strength (tensile strength up to 110 MPa). After further hybridization by incorporating nano-silica into the nanopaper, followed by hydrophobic treatment, we built hydrophobic nanopaper with transmittance over 82% and a water contact angle of about 102° that could potentially replace transparent plastic film and has wide applications in food packaging, agricultural film, electronic device, and other fields.

Parylene-Coated Cellulose Nanofiber Films with Improved Oxygen Barrier and Water Resistance

2018 ◽  
Vol 926 ◽  
pp. 73-78
Author(s):  
Dongyeop X. Oh
Keyword(s):  
Food Packaging ◽  
Water Resistance ◽  
Oxygen Transfer Rate ◽  
Cellulose Nanofiber ◽  
Light Transmittance ◽  
Oxygen Barrier ◽  
Low Oxygen ◽  
Water Contact ◽  
Coated Film ◽  
Nanofiber Film

In this paper, we introduce a parylene-coated cellulose nanofiber film. The parylene coating overcomes the limitations of cellulose nanofiber films used as food packaging films. The disadvantages of cellulose nanofiber films are that they are poor oxygen barriers and have low water resistances. This parylene-coated film achieved a low oxygen transfer rate (OTR) of <5 ml/m2/day because the parylene coating effectively covered the surface pores. In contrast to a pristine cellulose nanofiber film, the parylene-coated film was hydrophobic and exhibited a water contact angle of >75º. Similar to macro-cellulose papers, the pristine cellulose nanofiber film absorbed water and tore easily. The parylene-coated film was not permeable to water. However, the coating did not yield a significant improvement in the mechanical properties or light transmittance. We also investigated the change in surface morphology by the parylene coating. The parylene-coated film has great potential as a food packaging film owing to its improved oxygen barrier and water resistance characteristics.

Development of leftover rice/gelatin interpenetrating polymer network films for food packaging

2021 ◽  
Vol 10 (1) ◽  
pp. 37-48
Author(s):  
Sijia Li ◽  
Chun Shao ◽  
Zhikun Miao ◽  
Panfang Lu
Keyword(s):  
Food Packaging ◽  
Polymer Network ◽  
Raw Material ◽  
Interpenetrating Polymer Network ◽  
Waste Biomass ◽  
Practical Application ◽  
Water Contact ◽  
Force Microscopy ◽  
Atomic Force ◽  
Morphology Of Films

Abstract Waste biomass can be used as a raw material for food packaging. Different concentrations of gelatin (GEL) were introduced into the leftover rice (LR) system to form an interpenetrating polymer network (IPN) for improving the properties of the films. The structure and morphology of films were evaluated by Fourier transform infrared, scanning electron microscopy, and atomic force microscopy, which showed good compatibility between LR and GEL. The moisture content and oil absorption rate of IPN films were down by 105% and 182%, respectively, which showed better water and oil resistance than the LR film. In addition, increasing GEL concentration led to enhancement in the tensile strength of films from 2.42 to 11.40 MPa. The water contact angle value of the IPN films (117.53°) increased by 147% than the LR film (47.56°). The low haze of IPN films was obtained with the increment of the mutual entanglement of LR and GEL. The 30–50% GEL addition improved the water vapor barrier and thermal stability properties of the IPN films. This study highlights that LR as waste biomass can have a practical application in food packaging.

P-57: A Transparent Plastic Film having Excellent Optical Properties and High Heat Resistance for Flexible Display Substrates

2006 ◽  
Vol 37 (1) ◽  
pp. 418 ◽  
Author(s):  
Yoshiaki Watanabe ◽  
Ken-ichi Makita ◽  
Yasuyoshi Fujii ◽  
Hisanori Okada ◽  
Naoto Obara ◽  
...  
Keyword(s):  
Optical Properties ◽  
Heat Resistance ◽  
High Heat ◽  
Plastic Film ◽  
High Heat Resistance ◽  
Flexible Display ◽  
Transparent Plastic

scholarly journals Incorporation of Lipids into Wheat Bran Cellulose/Wheat Gluten Composite Film Improves Its Water Resistance Properties

Membranes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 18
Author(s):  
Guanghui Shen ◽  
Guoxian Yu ◽  
Hejun Wu ◽  
Shanshan Li ◽  
Xiaoyan Hou ◽  
...  
Keyword(s):  
Composite Film ◽  
Wheat Bran ◽  
Food Packaging ◽  
Water Resistance ◽  
Wheat Gluten ◽  
Vapor Permeability ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
Water Contact ◽  
Cross Sectional

This work evaluated the improvement effects of lipids incorporation on water resistance of composite biodegradable film prepared with wheat bran cellulose/wheat gluten (WBC/WG) using an alkaline–ethanol film forming system. Four types of lipids, paraffin wax (PW), beeswax (BW), paraffin oil (PO), and oleic acid (OA), were tested. We found that PW, BW, and PO incorporation at 5–20% improved water vapor permeability (WVP) and surface hydrophobicity of prepared films. Particularly, incorporation of 15% BW could best improve the water resistance properties of the film, with the lowest WVP of 0.76 × 10−12 g/cm·s·Pa and largest water contact angle (WCA) of 86.18°. Incorporation of OA led to the decline in moisture barrier properties. SEM images revealed that different lipids incorporation changed the morphology and of the composite film, and cross-sectional morphology indicated BW-incorporated film obtained more uniform and compact structures compared to other films. Moreover, Fourier transform infrared spectra indicated that the incorporation of PW or BW enhanced the molecular interactions between the film components, confirmed by the chemical shift of characteristic peaks at 3277 and 1026 cm−1. Differential scanning calorimetry results revealed that incorporation of PW, BW, and PO increased films’ melting point, decomposition temperatures, and enthalpy values. Furthermore, the presence of most lipids decreased tensile strength and elongation at the break of the film. Overall, the composite film containing 15% BW obtained the most promising water resistance performance and acceptable mechanical properties, and it thus most suitable as a hydrophobic biodegradable material for food packaging.

L-Fuzzy Concept Analysis as a Decision-Making Tool in the Development of Bio-Based Materials

2020 ◽  
Author(s):  
Itsaso Leceta ◽  
Cristina Alcalde ◽  
Marta Urdanpilleta ◽  
Pedro Guerrero ◽  
Koro de la Caba ◽  
...  
Keyword(s):  
Wound Healing ◽  
Food Packaging ◽  
Cost Effective ◽  
Concept Analysis ◽  
Water Contact ◽  
Elongation At Break ◽  
Fuzzy Concept ◽  
Fatty Food ◽  
Decision Making Tool

Abstract The use of L-fuzzy concept analysis for the determination of the formulations of gelatin-based films that fulfillspecifc functional properties is reported. The requirements of water contact angle (CA), water vapourtransmission rate (WVTR), L* and b* colour values, tensile strength (TS), elongation at break (EB) and glossvalues were specified for both fatty food packaging and wound healing applications. Once the requiredformulations were estimated by L-fuzzy concepts, the experimental results showed a high accordance with thepredicted values of the nal properties, as well as with the requirements. The errors were lower than 20% in allcases, except in colour (for food packaging) and gloss and elongation at break (for wound healing), in whichthe nal properties were even better that the estimations. This analysis allowed nding the requiredformulations in a highly cost-effective way.

scholarly journals Nanocomposite Film Based on Cellulose Acetate and Lignin-Rich Rice Straw Nanofibers

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 595 ◽  
Author(s):  
Mohammad Hassan ◽  
Linn Berglund ◽  
Ragab Abou-Zeid ◽  
Enas Hassan ◽  
Wafaa Abou-Elseoud ◽  
...  
Keyword(s):  
Contact Angle ◽  
Cellulose Acetate ◽  
Rice Straw ◽  
Water Vapor Permeability ◽  
Light Transmittance ◽  
Vapor Permeability ◽  
Water Contact ◽  
Transparent Films ◽  
Force Microscopy ◽  
Good Transparency

Nanofibers isolated from unbleached neutral sulfite rice straw pulp were used to prepare transparent films without the need to modify the isolated rice straw nanofibers (RSNF). RSNF with loading from 1.25 to 10 wt.% were mixed with cellulose acetate (CA) solution in acetone and films were formed by casting. The films were characterized regarding their transparency and light transmittance, microstructure, mechanical properties, crystallinity, water contact angle, porosity, water vapor permeability, and thermal properties. The results showed good dispersion of RSNF in CA matrix and films with good transparency and homogeneity could be prepared at RSNF loadings of less than 5%. As shown from contact angle and atomic force microscopy (AFM) measurements, the RSNF resulted in increased hydrophilic nature and roughness of the films. No significant improvement in tensile strength and Young’s modulus was recorded as a result of adding RSNF to CA. Addition of the RSNF did not significantly affect the porosity, crystallinity and melting temperature of CA, but slightly increased its glass transition temperature.

scholarly journals Shading and periods of acclimatization of micropropagated banana plantlets cv. Grande Naine

2009 ◽  
Vol 66 (3) ◽  
pp. 331-337 ◽  
Author(s):  
Ciro Scaranari ◽  
Paulo Ademar Martins Leal ◽  
Paulo Mazzafera
Keyword(s):  
Light Condition ◽  
Physiological Parameters ◽  
Field Conditions ◽  
Plastic Film ◽  
Air Humidity ◽  
Transparent Plastic ◽  
Light Water ◽  
Relative Air Humidity ◽  
Shade Cloth

Banana plantlets obtained by micropropagation need to be submitted to a period of acclimatization since they do not use light, water, and nutrients in an efficient way. The acclimatization must be carried out under greenhouse conditions where temperature, light, and air humidity are adequate for a gradual hardening of the plantlets. In this study, the development of banana plantlets was evaluated during acclimatization under a full light condition including covered surfaces with red shade cloth (70%, 50%, and 30% shade) and black shade cloth (50% shade), both under a transparent plastic film of 100 µm. Temperature, relative air humidity, irrigation, and nutrition conditions were also controlled. Physical and physiological parameters were recorded at various stages in the greenhouses after three, six, and nine weeks and also after seven weeks of transplanting to field conditions. Treatments were hierarchically graded according to their statistic classification. Combined results indicated superior outcomes of plantlets maintained under black 50% shade cloth for nine weeks, both in the summer and winter seasons. Similar results, but in a shorter time, were obtained with plantlets cultivated under red 70% shade cloth, for six weeks in the summer.

Opportunities for Implementation of FBC Boilers in Romania

2005 ◽  
Author(s):  
Liviu Dragos¸ ◽  
Mihu Giˆrjoaba˘ ◽  
Ca˘ta˘lin Flueraru ◽  
Nicolae Scarlat
Keyword(s):  
Fluidized Bed ◽  
District Heating ◽  
Calorific Value ◽  
High Energy ◽  
Hot Water ◽  
Current Status ◽  
Biomass Waste ◽  
Cfb Boiler ◽  
Biomass Resources

The evolution and current status of fluidized bed technology in Romania are presented. After a period of about 10 years when the FBC technology was rejected as a solution for power generation, due to the new environmental restrictions, the market is open again. Potential users are especially industrial units with high energy consumption, having combustibile wastes resulting from the technological processes. Two case studies are presented. The first is the utility from the city of Motru, producing thermal agent for the town district heating. It is currently equipped with one FB boiler (11.6 MWt hot water) and two pulverized coal boilers (50 t/h steam). The equipment is more than 40 years old, and is no longer acceptable in terms of thermal efficiency and pollutant emmissions. Taking into consideration the important biomass resources from the area, it was decided to build a new CFB boiler firing a mixture of local fuels — lignite and biomass waste. The second case study is ELECTROCARBON S.A. Slatina, the second important polluter from Olt county, producing carbon electrodes for use in metallurgy. Carbon waste resulting from the technological process have been deposited for many years in a nearby landfill, amounting to about 1.2 million tons. In spite of its high calorific value, because of the low volatile content and the grinding difficulties, little use was found for this material. Investigations are carried out to burn it in a fluidized bed boiler located near the site, that would replace two existing heat recovery steam generators producing electricity for the internal consumption.

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