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Next-generation microcapsules deliver 'chemicals on demand'
October 29, 2009Scientists in California are reporting development of a new generation of the microcapsules used in carbon-free copy paper, in which capsules burst and release ink with pressure from a pen. The new microcapsules burst when exposed to light, releasing their contents in ways that could have wide-ranging commercial uses from home and personal care to medicine. Their study appears in the Journal of the American Chemical Society, a weekly publication.
Jean Fréchet, Alex Zettl and colleagues note that liquid-filled microcapsules have many other uses, including self-healing plastics. Those plastics contain one group of microscapsules filled with monomer and another with a catalyst. When scratches rip open the capsules, the contents flow, mix, and form a seal. Microcapsules that burst open when exposed to light would have great advantages, the scientists say. Light could be focused to a pinpoint to kill cancer cells, for instance, or shined over an large area to print a pattern.
The new microcapsules consist of nylon spheres about the size of a grain of sand. They enclose a liquid chemical sprinkled with carbon nanotubes. The nanotubes convert laser light to heat that bursts the nylon capsule, releasing the chemical. Using such a system, doctors, for example, might inject microcapsules containing anti-cancer drugs to specific cells and make the capsules burst upon exposure to laser light, delivering their contents precisely where and when they are needed in the body.
American Chemical Society
American Chemical Society
Microcapsules Current Events and Microcapsules News RSSTiny capsules deliver
A tiny particle syringe composed of polymer layers and nanoparticles may provide drug delivery that targets diseased cells without harming the rest of the body, according to a team of chemical engineers. This delivery system could be robust and flexible enough to deliver a variety of substances.
New polymer coatings prevent corrosion, even when scratched
Imagine tiny cracks in your patio table healing by themselves, or the first small scratch on your new car disappearing by itself. This and more may be possible with self-healing coatings being developed at the University of Illinois.
New recipe for self-healing plastic includes dash of food additive
Adding a food additive to damaged polymers can help restore them to full strength, say scientists at the University of Illinois who cooked up the novel, self-healing system.
Self-repairing materials
Will the day come when cracks in buildings close up without external help and before they get to the stage where they cause damage to the component?
Catalyst-free chemistry makes self-healing materials more practical
A new catalyst-free, self-healing material system developed by researchers at the University of Illinois offers a far less expensive and far more practical way to repair composite materials used in structural applications ranging from airplane fuselages to wind-farm propeller blades.
Carnegie Mellon researchers to develop new drug delivery system
Carnegie Mellon University's Stefan F. Zappe is using adult neural stem cells to develop a new stem cell-based drug delivery therapy that may ultimately help treat a variety of inherited genetic disorders like Hunter syndrome.
Now, self-healing materials can mimic human skin, healing again and again
The next generation of self-healing materials, invented by researchers at the University of Illinois, mimics human skin by healing itself time after time.
Another boost for stem cell research
In the wake of the Senate's decision to pass the human embryo cloning legislation, another Australian research breakthrough is likely to strengthen the case for embryonic stem cell research.
Max Planck researchers channel microcapsules into tumour cells and release their contents using a laser impulse
Treating malignant tumours is difficult. Doctors have to destroy the tumour, but healthy tissue needs to be preserved. Chemotherapy tends to kill diseased cells, at the same time causing great damage to the body in general.
New 'self-exploding' microcapsules could take sting out of drug delivery
Belgian chemists have developed "self-exploding" microcapsules that could one day precisely release drugs and vaccines inside the human body weeks or even months after injection.
More Microcapsules Current Events and Microcapsules News Articles
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Microcapsule processing and technology by Asaji Kondo (Author) | |
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Givenchy SwissCare Firm Profile Intensive Face Firming with Green Tea Microcapsules 50ml/1.7oz by Givenchy Firms and hydrates your skin leaving it soft and supple. Suitable for all skin types. |
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6 each: Fuller Brush Micro Encapsulated Marble & Granite Cleaner (600N) by FULLER BRUSH Sold as 6 each. 22 oz. Cleans, polishes and protects all polished stone surfaces including marble, granite, Corian countertops, tables and mantels. Microcapsules containing concentrated polishing agents suspended in cleaning gel clean and polish stone surfaces. Safe for food preparation surfaces . Manufacturer number: 600N. SKU #: 1370592. Country of origin: (TBA). Distributed by . |
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Preparation and Characterization of Hollow Microcapsules for Use as Ultrasound Contrast Agents.: An article from: Polymer Engineering and Science by Padma Narayan (Author), Margaret A. Wheatley (Author) This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on November 1, 1999. The length of the article is 7084 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser. Citation Details Title: Preparation and Characterization of Hollow Microcapsules for Use as Ultrasound Contrast Agents. Author: Padma Narayan Publication: Polymer Engineering and Science (Refereed) Date: November 1, 1999 Publisher: Society of Plastics Engineers, Inc. Volume: 39 Issue: 11 Page: 2242 Distributed by Thomson... | |
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Microspheres, Microcapsules and Liposomes: Dendrimers, Assemblies and Nanocomposites v. 5 (Microspheres, microcapsules & liposomes) by Reza Arshady (Editor) | |
![Modelling prediction of the microcapsule size of polyelectrolyte [An article from: Chemical Engineering Journal]](http://ecx.images-amazon.com/images/I/51CVCBGHB5L._SL160_.jpg) |
Modelling prediction of the microcapsule size of polyelectrolyte [An article from: Chemical Engineering Journal] by E.P. Herrero (Author), E.M.M. Del Valle (Author), M.A. Galan (Author) This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser. Description: In order to have a better understanding of the atomization process for microencapsulation applications the disintegration of polymer liquid jets (sodium alginate) injected into high-velocity gas streams was studied and a mathematical model to predict the microparticle size has been developed. Air-blast atomization of viscous non-Newtonian fluid (alginate solution) was carried out in order to produce microbeads (1-50@mm) based on polyelectrolyte complexes with particle size control and a particle size... |
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Release Studies on Mesoporous Microcapsules for New Corrosion Protection Systems by Magdalena Walczak (Author) The present work has been motivated by a particular concept of corrosion protection; however, it addresses the generic field of storage and delivery of functional molecules. After processing of galvanized steel sheets a so-called cut-edge is exposed. Its cathodic protection is mostly insufficient and a solution is sought in the incorporation of functional microcapsules into the metallic coating. In detail, mesoporous silica particles have been studied with respect to compatibility as well as loading and release properties. The development and application of two methods, one based on microscopic and one spectroscopic measurement, allowed the characterization of release kinetics for single particles as well as particle assemblies. Anisotropic diffusion coefficients and surface diffusion... |
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HPLC Analysis of Iron in Microcapsules by Matthias Reismüller (Author) Iron deficiency is the most common nutritional deficiency worldwide. An approach to improve the situation is to fortify food with iron. The Austrian Company, GAT Microencapsulation AG has developed a food additive where iron is protected in a microcapsule (diameter 2-4 µm). This technology preserves iron in what is called the iron (II) state, which has high bioavailability and prevents iron from reacting with any other food compounds. The question is, how can the iron content of a product whether it is the raw materials, the microencapsulated food additive or the fortified food be determined in an automated way? The author Matthias Reismüller presents a solution by developing a HPLC method. The use of a complexation agent allows determining iron by UV or DAD detection. Analytical... |
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Microcapsules and Nanoparticles in Medicine and Pharmacy by Max Donbrow (Author) This book provides a comprehensive look at the important advances made in the design and production of microcapsules, microspheres, and nanoparticles. It discusses the diverse aspects and skills that must be mastered to be able to prepare and test products that will work correctly and be clinically acceptable for human or animal use. Chapters have been contributed by a distinguished international interdisciplinary panel specializing in various fields. Topics include important production technologies, characterization of morphologies, biological and chemical behavior of products and polymers, assessment of drug release kinetics, and pharmacokinetics and bioavailability. New clinical directions are surveyed, including chemo-embolization, passive and active targeting of tumors or organs,... |
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TEXTILES/FABRICS: Microcapsules Added to Protective Gear.: An article from: Flame Retardancy News by Business Communications Company, Inc. (Publisher) This digital document is an article from Flame Retardancy News, published by Business Communications Company, Inc. on May 1, 2001. The length of the article is 350 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser. Citation Details Title: TEXTILES/FABRICS: Microcapsules Added to Protective Gear. Publication: Flame Retardancy News (Newsletter) Date: May 1, 2001 Publisher: Business Communications Company, Inc. Volume: 11 Issue: 5 Page: NA Distributed by Thomson... |
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