16 results on '"Vibhore Kumar Rastogi"'
Search Results
2. Antioxidant Film Based on Chitosan and Tulsi Essential Oil for Food Packaging
- Author
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Himanshu Kumar, Arihant Ahuja, Ashish A. Kadam, Vibhore Kumar Rastogi, and Yuvraj Singh Negi
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Process Chemistry and Technology ,Safety, Risk, Reliability and Quality ,Industrial and Manufacturing Engineering ,Food Science - Published
- 2022
3. Biodegradable Stone Paper as a Sustainable Alternative to Traditional Paper: A Review
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Nupur Swain, Pragti Saini, Sampat Singh Bhati, and Vibhore Kumar Rastogi
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Polymers and Plastics ,Materials Chemistry - Published
- 2023
4. Biomass conversion of agricultural waste residues for different applications: a comprehensive review
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Nitin Gupta, Bhupender Kumar Mahur, Ansari Mohammed Dilsad Izrayeel, Arihant Ahuja, and Vibhore Kumar Rastogi
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Waste Products ,Soil ,Biofuels ,Health, Toxicology and Mutagenesis ,Carbohydrates ,Humans ,Environmental Chemistry ,Biomass ,General Medicine ,Fertilizers ,Pollution - Abstract
Agricultural waste residues (agro-waste) are the source of carbohydrates that generally go in vain or remain unused despite their interesting morphological, chemical, and mechanical properties. With rapid urbanization, there is a need to valorize this waste due to limited non-renewable resources. Utilizing agro-waste also prevents the problems like burning and inefficient disposal that otherwise lead to immense pollution worldwide. In addition, conversion of biomass to value-added products like earthen cups, weaving baskets, and bricks is equally beneficial for the rural population as it provides secondary income, creates jobs, and improves rural people's lifestyles. This review paper will discuss an overview of different applications utilizing agro-waste residues. In particular, agro-wastes used as construction material, bio-fertilizers, pulp and paper products, packaging products, tableware, heating applications, biocomposites, nano-cellulosic materials, soil stabilizers, bioplastics, fire-retardant additive, dye removal, and biofuels will be summarized. Finally, several commercially available agro-waste products will also be discussed, emphasizing the circular economy.
- Published
- 2022
5. Spray coating of edible insect waxes for liquid food packaging
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Arihant Ahuja and Vibhore Kumar Rastogi
- Subjects
General Physics and Astronomy ,Surfaces and Interfaces ,General Chemistry ,Condensed Matter Physics ,Surfaces, Coatings and Films - Published
- 2023
6. High precision pulp-based sacrificial molds: A solution towards mass production of hollow ceramic spheres for deep sea applications
- Author
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Vibhore Kumar Rastogi, Philip N. Sturzenegger, Urs T. Gonzenbach, Marc Vetterli, Manoj Naikade, Kavindra Kumar Kesari, Janne Ruokolainen, Jakob Kuebler, and Gurdial Blugan
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Process Chemistry and Technology ,Materials Chemistry ,Ceramics and Composites ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Published
- 2022
7. Paper bottles: potential to replace conventional packaging for liquid products
- Author
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Arihant Ahuja, Pieter Samyn, and Vibhore Kumar Rastogi
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Renewable Energy, Sustainability and the Environment - Published
- 2022
8. Stabilization of an Aqueous Bio-Based Wax Nano-Emulsion through Encapsulation
- Author
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Pieter Samyn and Vibhore Kumar Rastogi
- Subjects
biowax ,emulsion ,encapsulation ,nanoparticles ,General Chemical Engineering ,General Materials Science - Abstract
The emulsification of biowaxes in an aqueous environment is important to broaden their application range and make them suitable for incorporation in water-based systems. The study here presented proposes a method for emulsification of carnauba wax by an in-situ imidization reaction of ammonolysed styrene (maleic anhydride), resulting in the encapsulation of the wax into stabilized organic nanoparticles. A parameter study is presented on the influences of wax concentrations (30 to 80 wt.-%) and variation in reaction conditions (degree of imidization) on the stability and morphology of the nanoparticles. Similar studies are done for encapsulation and emulsification of paraffin wax as a reference material. An analytical analysis with Raman spectroscopy and infrared spectroscopy indicated different reactivity of the waxes towards encapsulation, with the bio-based carnauba wax showing better compatibility with the formation of imidized styrene (maleic anhydride) nanoparticles. The latter can be ascribed to the higher functionality of the carnauba wax inducing more interactions with the organic nanoparticle phase compared to paraffin wax. In parallel, the thermal and mechanical stability of nanoparticles with encapsulated carnauba wax is higher than paraffin wax, as studied by differential scanning calorimetry, thermogravimetric analysis and dynamic mechanical analysis. In conclusion, a stable aqueous emulsion with a maximum of 70 wt.-% encapsulated carnauba wax was obtained, being distributed as a droplet phase in 200 nm organic nanoparticles.
- Published
- 2022
9. Shellac: From Isolation to Modification and Its Untapped Potential in the Packaging Application
- Author
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Arihant Ahuja and Vibhore Kumar Rastogi
- Subjects
Renewable Energy, Sustainability and the Environment ,Geography, Planning and Development ,Building and Construction ,Management, Monitoring, Policy and Law - Abstract
Recently, terms such as sustainable, bio-based, biodegradable, non-toxic, or environment-benign are being found in the literature, suggesting an increase in green materials for various applications in the future, particularly in the packaging application. The unavoidable shift from conventional polymers to green materials is difficult, as most bio-sourced materials are not water-resistant. Nonetheless, Shellac, a water-resistant resin secreted by a lac insect, used as a varnish coat, has been underutilized for packaging applications. Here, we review Shellac’s potential in the packaging application to replace conventional polymers and biopolymers. We also discuss Shellac’s isolation, starting from the lac insect and its conversion to Sticklac, Seedlac, and Shellac. Further, the chemistry of shellac resin, the chemical structure, and its properties are examined in detail. One disadvantage of Shellac is that it becomes stiff over time. To enable the usage of Shellac for an extended time in the packaging application, a modification of Shellac via physical and chemical means is conferred. Furthermore, the usage of Shellac in other polymer matrices and its effect are reviewed. Lastly, the non-toxic and biodegradable nature of Shellac and its potential in packaging are explored by comparing it with traditional crude-based polymers and conventional bio-based materials.
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- 2023
10. A comprehensive review on textile waste valorization techniques and their applications
- Author
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Prince Kumar Mishra, Ansari Mohammed Dilsad Izrayeel, Bhupender Kumar Mahur, Arihant Ahuja, and Vibhore Kumar Rastogi
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Waste Management ,Health, Toxicology and Mutagenesis ,Textile Industry ,Textiles ,Environmental Chemistry ,General Medicine ,Incineration ,Pollution ,Plastics - Abstract
An increase in population compels the textile industry to expand production to fulfill the apparel requirement, resulting in huge textile waste. These wastes are managed either by landfilling or incineration processes, which negatively contribute to the environment. Converting waste into value-added products is essential to reducing environmental pollution and thereby achieving a circular economy through proper waste management practices. This paper provides a comprehensive overview of different categories and forms of textile waste, their source of generation, the reusing capability of the textile industry, other valorization potentials in different fields, and various challenges associated with their valorization practices. This review presents textile wastes as the raw material source for preparing different value-added products such as in manufacturing textiles, packaging materials, plastics, composites, construction applications, energy generation, chemical additives, composting, and several other applications.
- Published
- 2022
11. A processing route for dip-coating and characterization of multi-structured ceramic foam
- Author
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Vibhore Kumar Rastogi, Jakob Kuebler, Urs T. Gonzenbach, Bo Jiang, Philip N. Sturzenegger, Gurdial Blugan, and Marc Vetterli
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010302 applied physics ,Ceramic foam ,Materials science ,Scanning electron microscope ,Process Chemistry and Technology ,Machinability ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,01 natural sciences ,Dip-coating ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Coating ,Flexural strength ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,engineering ,Composite material ,0210 nano-technology ,Porosity ,Layer (electronics) - Abstract
Ceramic foam materials have received great attention in recent years for their light weight, thermal/electrical insulation, high crack tolerance and good machinability properties. However, some applications demand higher mechanical strength, better resistivity of the surface against mechanical impact or improved abrasion resistance. In this paper, the feasibility of dip coating 89 vol% porous, green alumino-silicate foam bars with dimensions in the centimeter range was studied and a dip coating route was proposed. The surface morphology of uncoated and coated foam bars was first analyzed by scanning electron microscopy (SEM) and later detailed using the GelsightTM method. Mechanical properties were determined by 4-point bending. A dense coating layer with a uniform thickness and good interfacial adhesion was obtained over the foam. Consequently, a three-fold increase in the flexural strength was measured for coated parts. In addition, the versatility of the developed dip coating route was demonstrated coating samples of bigger size like panels as well as complex geometries like cylindrical crucibles.
- Published
- 2019
12. Physicochemical and thermal characterization of poly (3-hydroxybutyrate-co-4-hydroxybutyrate) films incorporating thyme essential oil for active packaging of white bread
- Author
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Ansari Mohammed Dilsad Izrayeel, Vibhore Kumar Rastogi, Pieter Samyn, Palak Sharma, and Arihant Ahuja
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Chloroform ,Chemistry ,Active packaging ,engineering.material ,Antimicrobial ,law.invention ,Solvent ,chemistry.chemical_compound ,Crystallinity ,law ,Ultimate tensile strength ,engineering ,Biopolymer ,Essential oil ,Food Science ,Biotechnology ,Nuclear chemistry - Abstract
In this study, a biodegradable film from bacterial biopolymer, i.e., poly (3-hydroxybutyrate-co-4-hydroxybutyrate) or P(3HB-co-4HB) incorporating Thyme essential oil as an antimicrobial agent was developed as an active packaging for shelf-life extension of bread. Thin solvent-cast films containing 10, 20, and 30% v/w of Thyme oil were prepared and studied for the morphological, thermal, chemical, mechanical, barrier, and antimicrobial behaviors. The presence of oil in P(3HB-co-4HB) films and their purity without detectable remains of solvent, i.e., chloroform, was confirmed by infrared spectroscopy. In parallel, the time-bound release of volatile Thyme oil from the films was demonstrated when stored in a controlled environment. The plasticizing effect of Thyme oil in films was evidenced by decreased tensile strength and crystallinity. In contrast, an increase in elongation at break and water vapor permeability of oil films were measured. Finally, the antimicrobial activity of oil films was checked against total bread molds and observed that when bread was sealed in P(3HB-co-4HB) films containing 30% v/w Thyme oil, its shelf-life extended to at least 5 days compared to 1–4 days for the neat film.
- Published
- 2022
13. Compression Molding of Polyhydroxybutyrate Nano-Composite Films as Coating on Paper Substrates
- Author
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Pieter Samyn and Vibhore Kumar Rastogi
- Subjects
Crystallinity ,Nanocomposite ,Materials science ,Coating ,engineering ,Surface modification ,Compression molding ,Fiber ,engineering.material ,Composite material ,Layer (electronics) ,Nanocellulose - Abstract
After successful preparation of master batch formulations including polyhydroxybutyrate (PHB) and fibrillated cellulose additives, the compositions with different types and concentrations of fillers were used for the deposition of a coating on packaging paper grades, by using compression moulding in a hydraulic press. The resulting paper coatings are considered to provide a green solution for the production of protective barrier layer films with tunable hydrophobicity and oxygen barrier resistance. The processing of the nanocomposites into flat and homogeneous coatings was optimized for different conditions of moulding temperature and times, in particular, the flow conditions of the coating under pressing in contact with the substrate strongly depends on the presence of fillers. The effects of filler types on adhesion of the coating at the paper/polymer interface were investigated and the poor adhesion of native PHB coatings was tremendously improved after hydrophobic surface modification of the nanocellulose fillers. The inclusion of a wax and nanoparticles attached to the nanocellulose fiber surface enhanced the flowing properties of the coating by eliminating fiber agglomeration in contact with the paper substrate and reducing the effects of fiber pull outs. Therefore, hydrophobic fiber modification is necessary to obtain a homogenous dispersion during compressing moulding of coating materials for paper applications. Furthermore, the effect of processing on the final crystallinity of the master batches, films and paper coatings is presented by considering the reduction in degree of crystallinity for coatings in contact with a paper substrate owing to the surface confinement of crystallization processes. On the other hand, also the time-effects of secondary crystallization of the coatings as a function of aging time were lower for the coatings as compared to the free-standing films, in relation with the reduction of molecular mobility of the polymer chains under confined conditions.
- Published
- 2020
14. Tuning thermal release kinetics of soy oil from organic nanoparticles using variable synthesis conditions
- Author
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Dieter Van Nieuwkerke, Pieter Samyn, Dirk Stanssens, and Vibhore Kumar Rastogi
- Subjects
Chemistry ,General Chemical Engineering ,Maleic anhydride ,02 engineering and technology ,Dynamic mechanical analysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Styrene ,chemistry.chemical_compound ,Ammonium hydroxide ,Differential scanning calorimetry ,Chemical engineering ,Polymer chemistry ,General Materials Science ,Thermal stability ,0210 nano-technology ,Glass transition ,Maleimide - Abstract
The thermal release properties of soy oil from poly(styrene- co -maleimide) nanoparticles containing 50 wt% encapsulated oil have been quantified as a function of temperature and time. The effects of different synthesis conditions on the thermal stability of the nanoparticles and their oil release have been evaluated, i.e., by gradually increasing the amount of ammonium hydroxide used for the imidization of poly(styrene- co -maleic anhydride). First, the intrinsic thermal properties of the oil-filled nanoparticles were analysed by differential scanning calorimetry, which revealed an exothermal reaction related to the oil release and a suppression of the glass transition that may be masked owing to the complex structure of the hybrid nanoparticles. The isothermal scans showed different rates of oil release after a post-imidization reaction. The oil release was better followed by dynamic mechanical analysis, which illustrated changes in visco-elastic properties expressed by the maximum in the loss factor that related to the amount of released oil. Depending on the amount of ammonium hydroxide, the oil started to release below the glass transition temperature at various rates. Thermal release profiles of the oil were quantified by infrared and Raman spectrocopy after heating for 2 min to 6 h at 125 to 250 °C, based on variations in oil-related and imide-related absorption bands. The oil release increased below and above the glass transition temperature, following a parabolic trend, and progressively decreased at higher ammonium hydroxide concentrations, in parallel with higher imide content and changes in imide conformation. The kinetics and mechanism of the oil release can be described by the Korsmeyer–Peppas model, suggesting a dominating diffusion mechanism that is influenced by further imidization of the polymer matrix during heating.
- Published
- 2016
15. Reaction efficiency and retention of poly(styrene- co -maleimide) nanoparticles deposited on fibrillated cellulose surfaces
- Author
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Pieter Samyn, Vibhore Kumar Rastogi, and Dirk Stanssens
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Polymers and Plastics ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Styrene ,Contact angle ,chemistry.chemical_compound ,Polymer chemistry ,Materials Chemistry ,Fiber ,Cellulose ,Wax ,Chemistry ,Organic Chemistry ,Maleates ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Ammonium hydroxide ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Nanoparticles ,Polystyrenes ,Surface modification ,0210 nano-technology ,Hydrophobic and Hydrophilic Interactions - Abstract
Surface modification of micro- and nanofibrillated cellulose (MFC and NFC) under aqueous environment was performed by deposition of poly(styrene-co-maleimide) nanoparticles synthesized by imidization of poly(styrene-co-maleic anhydride) in presence of wax and ammonium hydroxide in variable amounts. Specifically, the influences of fiber fibrillation on nanoparticle formation (i.e., reaction efficiency) and permanent nanoparticle deposition on the fiber surface (i.e., retention) were investigated. The surface modification was mainly governed by the fiber diameter, surface charges and amount of wax. As such, the MFC affected the imidization reaction to a smaller extent (i.e., high reaction efficiency) and was more densely deposited by nanoparticles than NFC (i.e., high retention). Moreover, wax protected the fibers against fibrillation and peeling-off at high temperature and favored nanoparticle deposition. As a result, water contact angles of 142° were obtained for modified MFC in parallel with a surface coverage of 92%.
- Published
- 2016
16. Novel production method for in-situ hydrophobization of a microfibrillated cellulose network
- Author
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Pieter Samyn and Vibhore Kumar Rastogi
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Wax ,Materials science ,Mechanical Engineering ,Condensed Matter Physics ,Styrene ,chemistry.chemical_compound ,Ammonium hydroxide ,Cellulose fiber ,chemistry ,Chemical engineering ,Mechanics of Materials ,Styrene maleic anhydride ,visual_art ,visual_art.visual_art_medium ,Organic chemistry ,Surface modification ,General Materials Science ,Cellulose ,Maleimide - Abstract
The use of microfibrillated cellulose is mainly constraint by its hydrophilic character, and there is an urgent search for sustainable alternatives towards hydrophobic surface modification. Here, we present a production technique where cellulose fibers are modified by an in-situ reaction with styrene maleic anhydride, ammonium hydroxide and plant wax under aqueous environment. After imidization, the cellulose fibers were fibrillated along with partial coverage of the surface by styrene maleimide nanoparticles and incorporation of wax, resulting in the formation of a stable and hydrophobic micro-porous fiber network.
- Published
- 2014
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