nanotechnology is emerging science having a lots of applications in various feilds including food and agriculture " the small things can make big difference "
Natural polymers by Dr. khlaed shmareekhخالد شماريخ
the presentation is about the natural polymers i.e. classification, applications, properties and examples. it is in 25 pages in shortcuted manner and simple method.
Hydrogels are three-dimensional network of hydrophilic cross-linked polymer that do not dissolve but can swell in water or can respond to the fluctuations of the environmental stimuli
Hydrogels are highly absorbent (they can contain over 90% water) natural or synthetic polymeric networks
Hydrogels also possess a degree of flexibility very similar to natural tissue, due to their significant water content
This presentation deals with the usage of Nanocomposites in food packaging and different types of Nanocomposites used for coating to manufacturing of films.
Natural polymers by Dr. khlaed shmareekhخالد شماريخ
the presentation is about the natural polymers i.e. classification, applications, properties and examples. it is in 25 pages in shortcuted manner and simple method.
Hydrogels are three-dimensional network of hydrophilic cross-linked polymer that do not dissolve but can swell in water or can respond to the fluctuations of the environmental stimuli
Hydrogels are highly absorbent (they can contain over 90% water) natural or synthetic polymeric networks
Hydrogels also possess a degree of flexibility very similar to natural tissue, due to their significant water content
This presentation deals with the usage of Nanocomposites in food packaging and different types of Nanocomposites used for coating to manufacturing of films.
Introduction to biopolymers,
Biocompatible and biodegradable polymers,
Applications of biopolymers,
Biopolymers used in advanced drug delivery systems-
Cellulose and its derivatives,
chitosan,
PLGA,
Polyanhydride,
polycaprolactone.
The following slides contain introduction to biomedical polymers, their properties and classification. These polymers are classified in the basis of their sources as natural and synthetic polymers. synthetic polymers are classified on the basis of their functionality. Selection parameter and applications of biomedical polymers are also included.
This presentation deals wit the necessity of using biodegradable polymers and its significance. It tells about the method of preparation and recent developments in the field, specifically in Aerospace industry
Recently, the advantages of biopolymers over conventional plastic polymers are unprecedented, provided that they are used in situations in which they raise the functionality and generate extra benefits for human life. Therefore, biopolymers have received much attention because they play an important place in day-to-day life for their specific tunable characteristics, making them attractive in a wide range of applications. Biopolymers can produce materials with tunable properties such as biodegradability, biocompatibility, renewability, inexpensiveness, availability, which are critically important for designing materials for use in biomedical applications. In addition to these properties, smart biopolymers could be prepared by changing the polymer components, which would create more target oriented applications. Biopolymers are potentially used in biomedical applications, including drug delivery, infections, tissue engineering, wound healings, and other as wells.
Introduction to biopolymers,
Biocompatible and biodegradable polymers,
Applications of biopolymers,
Biopolymers used in advanced drug delivery systems-
Cellulose and its derivatives,
chitosan,
PLGA,
Polyanhydride,
polycaprolactone.
The following slides contain introduction to biomedical polymers, their properties and classification. These polymers are classified in the basis of their sources as natural and synthetic polymers. synthetic polymers are classified on the basis of their functionality. Selection parameter and applications of biomedical polymers are also included.
This presentation deals wit the necessity of using biodegradable polymers and its significance. It tells about the method of preparation and recent developments in the field, specifically in Aerospace industry
Recently, the advantages of biopolymers over conventional plastic polymers are unprecedented, provided that they are used in situations in which they raise the functionality and generate extra benefits for human life. Therefore, biopolymers have received much attention because they play an important place in day-to-day life for their specific tunable characteristics, making them attractive in a wide range of applications. Biopolymers can produce materials with tunable properties such as biodegradability, biocompatibility, renewability, inexpensiveness, availability, which are critically important for designing materials for use in biomedical applications. In addition to these properties, smart biopolymers could be prepared by changing the polymer components, which would create more target oriented applications. Biopolymers are potentially used in biomedical applications, including drug delivery, infections, tissue engineering, wound healings, and other as wells.
107 yun-yu wang - 7538029 - method of room temperature growth of si ox on s...Mello_Patent_Registry
Yun-Yu Wang, Christian Lavoie, Kevin E. Mello, Conal E. Murray, Matthew W. Oonk - Method of Room Temperature Growth of SIOx on Silicide as an Etch Stop Layer for Metal Contact Open of Semiconductor Devices
SLY-S1 Tearing Tester is designed for the tearing test of films, sheets, flexible PVC, PVDC, waterproof films, woven materials, polypropylene, polyester, paper, cardboard, textile and non-woven and etc.
PACER: Fine-grained Interactive Paper via Hybrid Camera and Touch Gestures on...Chunyuan Liao
PACER is a gesture-based interactive paper system that supports fine-grained paper document content manipulation through the touch screen of a cameraphone. Using the phone’s camera, PACER links a paper document to its digital version based on visual features. It adopts camera-based phone motion detection for embodied gestures (e.g. marquees, underlines and lassos), with which users can flexibly select and interact with document details (e.g. individual words, symbols and pixels). The touch input is incorporated to facilitate target selection at fine granularity, and to address some limitations of the embodied interaction, such as hand jitter and low input sampling rate. This hybrid interaction is coupled with other techniques such as semi-real time document tracking and loose physical-digital document registration, offering a gesture-based command system. We demonstrate the use of PACER in various scenarios including work-related reading, maps and music score playing. A preliminary user study on the design has produced encouraging user feedback, and suggested future research for better understanding of embodied vs. touch interaction and one vs. two handed interaction.
Companies today are more dependent than ever on partners as their extended sales and support teams. For these companies, building and managing a channel ecosystem is critical. This raises the stakes around channel management. It is not enough to seek operational excellence from your partner efforts. You must seek competitive advantage.
Follow five channel management disciplines to make this happen.
It is described about polymer/clay nanocomposites which can be abbreviated to PCNC, their preparation methods, properties and relevances, important types of polymers employed in the preparation of PCNC, montmorillonite crystal structures,
Acrylic resin was introduced to dentistry in 1936 and received a great response from the dental professionals such that by 1946, 98% of all denture were made with methyl methacrylate polymer or copolymer.
Prior to 1940 vulcanite was the most widely used denture base resin. This is highly cross linked natural rubber which was difficult to pigment and tended to become unhygienic due to the uptake of saliva.
Key Features of The Italian Restaurants.pdfmenafilo317
Filomena, a renowned Italian restaurant, is renowned for its authentic cuisine, warm environment, and exceptional service. Recognized for its homemade pasta, traditional dishes, and extensive wine selection, we provide a true taste of Italy. Its commitment to quality ingredients and classic recipes has made it a adored dining destination for Italian food enthusiasts.
Piccola Cucina is regarded as the best restaurant in Brooklyn and as the best Italian restaurant in NYC. We offer authentic Italian cuisine with a Sicilian touch that elevates the entire fine dining experience. We’re the first result when someone searches for where to eat in Brooklyn or the best restaurant near me.
Ang Chong Yi Navigating Singaporean Flavors: A Journey from Cultural Heritage...Ang Chong Yi
In the heart of Singapore, where tradition meets modernity, He embarks on a culinary adventure that transcends borders. His mission? Ang Chong Yi Exploring the Cultural Heritage and Identity in Singaporean Cuisine. To explore the rich tapestry of flavours that define Singaporean cuisine while embracing innovative plant-based approaches. Join us as we follow his footsteps through bustling markets, hidden hawker stalls, and vibrant street corners.
At Taste Of Middle East, we believe that food is not just about satisfying hunger, it's about experiencing different cultures and traditions. Our restaurant concept is based on selecting famous dishes from Iran, Turkey, Afghanistan, and other Arabic countries to give our customers an authentic taste of the Middle East
Roti Bank Hyderabad: A Beacon of Hope and NourishmentRoti Bank
One of the top cities of India, Hyderabad is the capital of Telangana and home to some of the biggest companies. But the other aspect of the city is a huge chunk of population that is even deprived of the food and shelter. There are many people in Hyderabad that are not having access to
1. Nano technology based bio
degradable plastics
By: Prasad Reddy,M.N
M-Tech(FST)
2015694708
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12. What does Biodegradable Mean
• Biodegradability : complete assimilation of the degraded products as
a food source by the soil microorganisms would ensure returning
the carbon into the ecosystem safely and effectively
• According to the European Bio plastics organization,
Bio plastics : can be defined as plastics based on renewable resources
(bio based) or as plastics which are biodegradable and/or compostable.
13. • Poor mechanical properties
• Low thermal stability
• Relative humidity dependancy
• Permeable to water
Biodegradable nano-composites
Cellulose, starch, zein(from corn) when synthesized as nanofibers
obtain superior properties like;
Increased heat resistance
High thermal stability
improved barrier properties
Improved permeable properties
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Shortcomingof biodegradable plastics
14. Two approaches for nanomaterial making
• Top-down:- by breaking up bulk material &
nanolithography
Eg. Mechanical alloying
• Bottom-up:- allows nanostructures to be built from
individual atoms
Eg: Inert gas condensation
Examples: nanoaluminums, nanotitanium, nanosilver,
ZnO, MgO, nanoclays, nanofibres, nanotubes
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POLYMER NANOCLAY NANOCOMPOSITE
15. NanocompositePreparation
• For nanocomposite preparation, (OMLS)Organically Modified
Layered Silicates (powder form) and PLA (pellets form) were first
dry-mixed by shaking them in a bag.
• The mixture was then melt-extruded by using a twin screw
extruder operated at 210℃ (screw speed = 100 rpm, feed
rate=120 gm /min) to yield nanocomposite strands.
• The strands were pelletized and dried under vacuum at 60 ℃ for
48 h to remove water.
• The dried nanocomposite pellets were then converted into sheets
with a thickness of 0.7–2 mm by pressing with 1.5 MPa at 190 ℃
for 3 min.
• The molded sheets were then quickly quenched between glass
plates and then annealed at 110 ℃ for 1.5 h to crystallize
isothermally before being subjected to wide-angle X-ray
diffraction, transmission electron microscopy, and dynamic
mechanical properties measurements.
16. Incorporationofpolymatrixin tonanoparticles
• In situ polymerization : dissolution of the nanoparticles
in the monomer solution before polymerization,
• solvent intercalation :use of a solvent to enhance the
affinity between the nanoparticles and the matrix
• melt intercalation : addition of the nanoparticles during
extrusion
Source: Chivrac et al., 2009; Shen, Simon, & Cheng,2002).
18. Others
•Nanofibres: barrier and mechanical properties, it also
displayed high transparency properties
•Silica nanoparticles: improve mechanical or barrier properties
of composites
•Starch nanocrystals: mechanical properties
•Titanium dioxide nanoparticulate: block UV light and provide
a longer shelf-life for food
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19.
20. BiopolymersBasedPackagingMaterials
Starch:
Starch is a widely available and easy biodegradable natural
resource.
1) Preparation of starch composition with other plastics with a
low amount of starch to enhance the biodegradability of
traditional oil-based polymer materials.
2) Starch application is the preparation of starch composite
with starch content being more than half by mass and
3) starch biodegradable polymers preparation uses the
extrusion processing of mixtures of granular starch.
21. Cellulose
• Cellulose is the most widely spread natural polymer and is
derived by a delignification from wood pulp or cotton linters.
• It is a biodegradable polysaccharide which can be dissolved in
a mixture of sodium hydroxide and carbon disulphide to obtain
cellulose xanthate and then recast into an acid solution
(sulfuric acid) to make a cellophane film.
• Alternatively, cellulose derivatives can be produced by
derivatization of cellulose from the solvated state, via
esterification or etherification of, hydroxyl groups.
22. Synthesis of CelluloseNanofibers
Structure and Properties of Cellulose
Nanofibers.
TEM, SEM, field-emission scanning electron
microscopy (FE-SEM), atomic force
microscopy (AFM), wide-angle Xray
scattering (WAXS), and NMR spectroscopy
have been used to study the structure of
cellulose nanofibers
Source : Susheel Kalia et.al., 2011
23. PHA
• The polyhydroxyalkanoates (PHA) family are biodegradable
thermoplastic polymers, produced by a wide range of
microorganisms.
• The polymer is produced in the microbial cells through a
fermentation process and then harvested by using solvents
such as chloroform, methylene chloride or propylene chloride.
• More than 100 PHA composites are known, of which
polyhydroxybutyrate (PHB) is the most common.
• The PHAs have potential as a substitute for many conventional
polymers, since they possess similar chemical and physical
properties
36. Limitations of bio plastics
• higher price level compared to conventional plastics,
• Brittleness(due to high glass transition and melting
temperatures)
• Thermal instability, low melt strength, difficult heat
sealability,
• high water vapor(hydrophilic nature of starch and cellulose,)
and oxygen permeability restrict the use of PLA films for
many food packaging applications
37. To over come these problems
• To achieve this modifications, a good interaction between
the polymer matrix (continuous phase) and the nanofiller
(discontinuous phase) is desired (Lagaron & Lopez-Rubio,
2011).
• Coatings : cellulose film with PHB resulted in lower WVP
values, higher elastic modulus and tensile strength for
films containing 10% or more PHB and better strain at
break for films containing 15% or more PHB (Cyras et al.,
2009).
• A nitrocellulose or PVdC coating on cellophane improved
both O2 and H2O barrier properties (Shen et al., 2009).
38. • In general, Popa and Belc (2007) stated that chitosan
may be used as a biobased coating on polymers with
poor gas barrier properties.
• coating of PLA with PLA-Si/SiOx, PCL-Si/SiOx
(polycaprolactone) or PEO-Si/SiOx (polyethylene oxide)
enhanced the barrier (oxygen and water vapor)
properties,
39.
40. Reference
• Nanotechnology for bioplastics opportunities, challenges and
strategies, (2011) Trends in Food Science & Technology 22 611-617.
• Nanocomposites for food packaging applications 2009, Henriette
M.C. de Azeredo, Food Research International 42 1240–1253.
• Biodegradable Polylactide and Its Nanocomposites: Opening a New
Dimension for Plastics and Composites (2003) Suprakas Sinha
Ray,*Masami Okamoto, research gate, DOI:
10.1002/marc.200300008
• Recent trends of Biodegradable polymer: Biodegradable films for
Food Packaging and application of Nanotechnology in
Biodegradable Food Packaging , (2014) Malathi A. N. Current
Trends in Technology and Science ISSN : 2279-0535. Volume : 3,
Issue : 2
• Cellulose-Based Bio- and Nanocomposites (2011), Susheel Kalia
et.al., International Journal of Polymer Science , Article ID 837875,
35 pages, doi:10.1155/2011/837875,Hindawi Publishing
Corporation.
41. Thank you!!
Our technological powers increase, but the side
effects and potential hazards also escalate.
Alvin Toffler