Monthly Archives: December 2009

Nanosilver in medicine

 Nanosilver in medicine

Nanosilver in medicine has been used in jewellery, coins and decoration. It is less well known that silver has been valued for almost as long for its medicinal properties. In ancient Greece silver was used to purify drinking water, and just decades ago doctors applied a thin layer of silver to large wounds to prevent infection and promote healing. Silver became less frequently used to prevent infection once antibiotics were invented, but now it is being used again because of the rise in drug-resistant bacteria and new discoveries in materials sciences. The trouble with silver is that the properties that make it useful for jewellery make it less useful in medicine.

Nanosilver in medicine

Nanosilver in medicine

Nanosilver in medicine are used in wound dressings for burns and serious injuries. The dressing has three layers. There is an absorbent inner core to keep the wound moist, which helps it to heal. Either side of this core is a net made of polythene, which is coated with nano silver. The polythene net is designed so that it does not stick to the wound. The silver kills a wide range of bacteria. It is important that it can begin to kill the bacteria as quickly as possible. The tiny nanoparticles of silver dissolve very quickly once they are moistened (for example by blood fromthe wound) and the silver can get to work straight away.

Uses of Nanosilver in medicine Knowledge of the applications of silver nanomaterials in consumer products is crucial for an accurate prediction of release pathways, exposure, LCA, and risk assessment. During the last two decades, an extensive number of methods have been reported for the synthesis of silver nanoparticles with different particle sizes, shapes and surface properties. This advancement in their manufacturing techniques attracted the attention of many industries wanting to exploit the unique properties of silver nanomaterials for beneficial use.

The applications of Nanosilver in medicine are scattered but they can be classified under three main categories: scientific, industrial, and consumer products.Properties of nanosilver Two primary factors cause nanomaterials to behave significantly differently than bulk materials: surface effects and quantum effects (Roduner, 2006). These factors affect the chemical reactivity of materials as well as their mechanical, optical, electric, and magnetic properties. Nanosilver has chemical and biological properties that are appealing to the consumer products, food technology, textiles/fabrics, and medical industries. Nanosilver also has unique optical and physical properties that are not present in bulk silver, and which are claimed to have great potential for medical applications.

We invite you to contact us for Nanosilver in medicine information about our company and our capabilities. If you want to buy nanomaterials or discuss Oxide Nanoparticles,you can mail us at sales@nanoshel.com

Nanosilver in medicine

Nanosilver in medicine

Contact Us for Nanosilver in medicine
From us, you can easily purchase nanomaterials at great prices. Place online order and we will dispatch your order through DHL, FedEx, UPS. You can also request for a quote by mailing us at sales@nanoshel.com Contact: +1 302 268 6163 (US and Europe), Contact: +91-9779550077 (India). We invite you to contact us for further information about our company and our capabilities. At Nanoshel, we could be glad to be of service to you. We look forward to your suggestions and feedback.

NANO SILVER AS AN ANTIMICROBIAL AGENT FOR COTTON

NANO SILVER AS AN ANTIMICROBIAL AGENT FOR COTTON

Nano silver as an antimicrobial agent for cotton Due to the growing demand for comfortable, clean, and hygienic textile goods, an urgent need for production of antimicrobial textile goods has arisen. With the advent of new technologies, the growing needs of consumers in terms of health and hygiene can be fulfilled without compromising issues related to safety, human health, and the environment. Nano-scale particles provide a narrow size distribution, which is required to obtain a uniform material response. Materials such as paints, pigments, electronic inks, and ferrofluids as well as advanced functional and structural ceramics require that the particles be uniform in size and stable against agglomeration.

Nano silver as an antimicrobial agent for cotton

Nano silver as an antimicrobial agent for cotton

Nano silver as an antimicrobial agent for cotton with significant surface areas, often agglomerate to minimise the total surface or interfacial energy of the system. Although the process of using solution chemistry can be a practical route for the synthesis of both sub-micrometre and nano-scale particles of many materials, issues such as control of size, distribution of particles, morphology, crystallinity, particle agglomeration during and after synthesis, and separation of these particles from the reactant need further investigation. In the last few years, the market for antimicrobial textiles has shown double digit growth. This growth has been fuelled by the increased need of consumers for fresh, clean, and
hygienic clothing. Extensive research is taking place to develop new antimicrobial finishes. This paper reports, in detail, the role of textiles in microbial propagation, the mechanism of antimicrobial activity, and the principles of antimicrobial finishing of textiles.

Nano silver as an antimicrobial agent for cotton is a powerful and natural anti microbial agent that has been proven highly effective in fighting a whole range of microbes. Acting as a catalyst, it reportedly disables the enzyme that one-celled bacteria, viruses, and fungi need for their oxygen intake without causing corresponding harm to human enzymes or other parts of the human body chemistry. The result is the destruction of disease-causing organisms without any detrimental effects on the surrounding human tissue.

Facts about silver

– NASA uses silver in its water purification systems for the space shuttle.
– Silver kills over 650 different types of bacteria
– The Romwater in silver vessels.
– American settlers put and stored silver coins in milk containers to prevent spoilage.

How does nano silver work? Antimicrobial mechanism of nano-silver
– Nano silver is presumed to exert its antimicrobial effect through the dual mechanisms of denaturation and oxidation.

Denaturation
– The essential structure of the enzyme that produces oxygen seems to get disconnected by the catalytic
function of silver.

Oxidisation
– Silver nano particles generate reactive oxygen in the air or in the water, which in turn destroy cell wall membranes of bacteria. Nano silver versus other antibiotics

Effective but harmless
– Silver attacks bacteria by either denaturation or oxidisation. For these reasons, bacteria cannot build
resistance against silver. As human cells are a tissue type, they are unaffected by these actions.

Permanent solution
– Unlike most antibiotics, which are consumed while destroying bacteria, silver remains unconsumed while
constantly working as a catalyst.

Nano silver as an antimicrobial agent for cotton can be used effectively as an antimicrobial agent for cotton. The higher the concentration of antimicrobial agent, the larger the zone of inhibition in the cases of both Grampositive and Gram-negative bacteria. SEM study of antimicrobial-finished fabric reveals that a continuous polymer film has been formed on the fabric. The concentration of PVOH controls the bending length and crease recovery angle. The higher the concentration of PVOH, the greater the bending length and crease recovery angle. Curing temperature and time have profound impacts on the tensile strength. The higher the curing temperature and time, the lower the tensile strength.

We invite you to contact us for further information about our company and our capabilities. If you want to buy nanomaterials or discuss Oxide Nanoparticles,you can mail us at sales@nanoshel.com

Nano silver as an antimicrobial agent for cotton

Nano silver as an antimicrobial agent for cotton

Contact Us for Nano silver as an antimicrobial agent for cotton
From us, you can easily purchase nanomaterials at great prices. Place online order and we will dispatch your order through DHL, FedEx, UPS. You can also request for a quote by mailing us at sales@nanoshel.com Contact: +1 302 268 6163 (US and Europe), Contact: +91-9779550077 (India). We invite you to contact us for further information about our company and our capabilities. At Nanoshel, we could be glad to be of service to you. We look forward to your suggestions and feedback.

Silver Nanoparticles Drinking Water Purification

 Silver Nanoparticles Drinking Water Purification

Silver Nanoparticles Drinking Water Purification: Currently, WHO/UNICEF estimated that 783 million people in the world do not have access to safe drinking water. Its reported 1.87 million childhood deaths are due to water-borne diseases. Conventional water treatment and delivery approaches are considered unfeasible in these under-developed areas because they need high capital investments, a high cost of maintenance, a high quantity water source, and these require users to pay for the treated water. People have to collect their own water outside their homes and then store the water in the household due to the lack of water supply, and contaminations could occur during the water collection, transport, and storage, which cause a high chance of water-borne disease infection. A point-of-use (POU) ceramic water filter (CWF) provides an
option to purify the water.

Silver Nanoparticles Drinking Water Purification

Silver Nanoparticles Drinking Water Purification

Silver Nanoparticles Drinking Water Purification

A ceramic water filter (CWF) is a simple device that can eliminate water-borne pathogens. Currently, CWFs are manufactured by pressing and firing a mixture of clay and a burnable organic material such as flour, rice husks, or sawdust before treatment with AgNP [55]. The filter is formed using a filter press, after which it is air-dried and fired in a kiln. This forms the ceramic material and burns off the sawdust, flour, or rice husk in the filters, making it porous and permeable to water. CWFs are reported as effective in removing more than 99% of protozoa and 90-99.99% of bacteria from Silver Nanoparticles in Drinking Water Purification. However, a high removal of viruses is not achieved.

Silver nanoparticles (AgNO3, Ag+) are added to filters at all CWF factories to achieve higher pathogen removal due to their antimicrobial properties. The silver solutions are applied to CWF either by brushing or dipping. It was reported that 83% of CWF factories apply Silver nanoparticles and 17% use Ag+. The concentration of silver applied at CWF factories varies. Reported amounts of Silver nanoparticles applied on CWFs ranges from 32 to 96 mg per CWF. Current guidelines recommend 64 mg of Silver nanoparticles per CWF. Two mechanisms of microorganism disinfection by CWFs were suggested. (i) CWFs can remove microorganisms by size exclusion or adsorption; (ii) Silver nanoparticles or Ag+ inside of CWFs can inactivate pathogens.The bacteria trapped inside of CWFs coated with AgNP or Ag+.

Silver nanoparticles

Silver Nanoparticles Drinking Water Purification: Water characteristics at the filter user’s home also vary with location. Previous studies have reported a reduction in antibacterial properties of Silver Nanoparticles in Drinking Water Purification with increased size of the nanoparticle clusters due to aggregation in the presence of divalent ions such as Ca2+ and Mg2+. In addition, environmental waters usually contain organic compounds, such as humic acids (HA) [8, 51]. These natural organic matter compounds can rapidly coat the nanoparticle surfaces, creating a physical barrier that prevents interaction between nanoparticles and bacteria. While previous studies have reported that different water chemistry conditions can have an impact on the disinfection performance of AgNP in the aqueous phase[8], these parameters have not been evaluated on CWFs either in the field or in laboratory tests.

We invite you to contact us for Silver nanoparticles information about our company and our capabilities. If you want to buy nanomaterials or discuss Oxide Nanoparticles,you can mail us at sales@nanoshel.com

Silver Nanoparticles in Drinking Water Purification

Silver Nanoparticles in Drinking Water Purification

Contact Us for Silver Nanoparticles Drinking Water
From us, you can easily purchase Silver Nanoparticles Drinking Water Purification at great prices. Place online order and we will dispatch your order through DHL, FedEx, UPS. You can also request for a quote by mailing us at sales@nanoshel.com Contact: +1 302 268 6163 (US and Europe), Contact: +91-9779550077 (India). We invite you to contact us for further information about our company and our capabilities. At Nanoshel, we could be glad to be of service to you. We look forward to your suggestions and feedback.