Silver Nanoparticles Antimicrobial – Silver Nanoparticles Antimicrobial,Copper Oxide Nanoparticles,Gold Nanopowder

July 26, 2021July 26, 2021

Knowledge about flake silver powder and grinding aids

The properties of flake silver powder are stable, and the particles are in surface or line contact, so the resistance is relatively low and the conductivity is good. Flake silver powder is one of the important materials for electronic components, and is widely used in electronic components such as membrane switches, filters, carbon film potentiometers, silver nanoparticles tantalum capacitors, and semiconductor chip bonding.

The key process for preparing flake silver powder is ball milling. The process of ball milling is more complicated. The quality of flake silver powder’s micro morphology, diameter-to-thickness ratio, and surface condition all depend on the ball milling process. The main influencing factors of ball milling include ball gradation, ball mill speed, ball-to-material ratio, ball milling time, type and amount of grinding aids, ball milling atmosphere, ball milling temperature and so on.

Different ball milling aids have different effects on the performance of the powder. If only absolute ethanol is used as the wet milling medium, the prepared silver powder particles are coarser and the silver flakes are larger, but they are very bright. Using oleic acid as the ball milling medium, the prepared powder is better in flakes and the color is silver gray. Using stearic acid as the ball milling medium, the prepared silver powder has a flake size and the color is silver gray. The color of the silver powder prepared by the compound auxiliary agent is bright gray.

The so-called grinding aids are chemical substances that can significantly improve the efficiency of crushing operations and reduce the energy consumption per unit of product. It includes organic and inorganic matters. The main purpose of adding a grinding aid is to improve the grindability of the material, reduce the interaction between particles and the adhesion of fine particles on the grinding medium, and provide the fluidity of the material in the mill, thereby improving the fineness and quality of the product.

There are mainly two views on the mechanism of action of grinding aids. One is the theory of “adsorption reduces hardness”, which believes that the adsorption of grinding aid molecules on particles reduces the surface energy of the particles or causes dislocations in the crystal lattice near the surface layer, thereby reducing the strength and hardness of the particles. The second is the theory of “pulp rheology adjustment”, which believes that the grinding aid reduces the viscosity of the pulp and promotes the dispersion of the particles by adjusting the rheological properties of the pulp and the surface electrical properties of the mineral particles. Both theories explain the mechanism of the grinding aid from a certain aspect, but the grinding aid acts on the powder in a highly complex ball milling environment, so it should be considered comprehensively.

According to experiments, the amount of ball milling aids added has a great relationship with the bulk density. With the increase in the amount of ball milling aids, the bulk density of the powder continues to decrease. When the amount of ball milling aids is over 1.5%, the bulk density of the powder gradually increases, so the amount of ball milling aids can be considered to be controlled around 1.5%.

Hongwu Nano produces flake silver powder with low bulk density and normal bulk density. In addition, customers for different applications have different requirements for whether to wash off the grinding aids, and we can deal with them accordingly. Get nano silver price from us quickly!

May 4, 2018

Nano Silver Used for Conductive Ink

Nano-silver is the main component of conductive ink, its concentration is a very critical issue, because it relates to the ability to achieve good conductivity and whether the smooth printing. If the concentration of silver-containing ink is large, the use of this material for fine inkjet, its high concentration and low viscosity conditions with rapid precipitation trend. In the case of high concentrations and very small particles, the distance between the particles and the particles becomes very small, which makes it difficult to prevent the occurrence of agglomeration. The same weight of particles to form a diameter of 10nm suspended matter than the number of 1μm diameter of the formation of suspended solids to more than 1 million times. Therefore, at higher concentrations, the dispersion and stabilization of nano-silver particles is a key technology to make inkjet conductive ink become a mature product.
The adjustment of the diameter of the silver particles, the surface modification method and the ink formulation can improve the dispersion stability of the silver particles. The nano-silver particles may also be dispersed in ethanol so that it is compatible with diethylene glycol or with the ethylene glycol system to form an alcohol-based dispersion.

In general, silver particles less than 100 nm are called nanosized silver. When the diameter of the silver particles reaches this scale, increasing the relative proportions of the surface atoms with higher energy will cause a sudden change in the properties of the material. This change can be expressed as a change in sintering capacity characteristics or due to a change in the band gap Caused by changes in the electromagnetic properties caused by the electrical properties or optical properties of the huge changes in the screen, such as color and transparency changes. For nano-silver, the critical point of its performance change is related to the diameter of the particles. When the particle diameter is less than 50nm, the sintering performance at low temperature (less than 200 ℃) is obviously enhanced, and the melting point can be reduced to 120 ~ 200 ℃ The Inkjet conductive ink is the use of nano-silver particles low melting point of the characteristics of the development history, which can be plastic substrates, and even paper on the basis of printing and sintering process, excellent performance of the conductive layer. Inkjet conductive inks are mostly made of spherical nano silver.

Due to the presence of tiny particles, the inkjet ink is somewhat similar to the pigment type inkjet ink. Therefore, the solid particles in the ink must meet certain requirements: the maximum diameter of the silver particles should be less than 1/10 of the diameter of the nozzle to avoid bridging and blocking phenomena, taking into account the nozzle shape and the number of operations and other factors Founder, this ratio should actually smaller. At present, many companies inkjet conductive ink silver particle diameter is generally 20 ~ 50nm. This scale of silver particles, both with low melting characteristics, but also to meet the inkjet print on the size of the requirements of solid particles.

December 10, 2015

About Antimicrobial Silver Nanoparticles

“Nano Silver” is “silver nanoparticles” is abbreviated or commonly known, refers to the particles of silver atoms, the particle size is generally in the range of 1-100 nm. Silver chunks of material surface having antibacterial properties already well known, the mechanism is located on the surface of the silver atoms in the oxygen environment may be slow oxidation, releasing free silver ions (Ag +), the silver ions with the wall of the bacteria mercapto binding, blocking the bacterial respiratory chain, eventually killing bacteria adhered to the surface of the material. For bulk material is silver, the oxidation process is extremely slow, the amount and rate of release of silver ions very low.

Some people are claiming for Silver Nanoparticles Antimicrobial and solutions to be bad without any proof. Dr. Flavin from the FDA actually stated that silver is in fact safe and can benefit the immune system.

Silver Nanoparticles are tiny particles of silver and are made with a very low application of electricity to pure silver. If the amount of electricity applied is too much, the silver particles will not be nano sized and it’s important that they are nanoparticles because they are small enough to affect viruses.

As far as the claims of silver being “toxic”. Have you ever seen any any effects from holding silver in your hand. The answer to that would be no. If silver were toxic, we couldn’t hold it with our bare hands safely.

In the air there are heavy metals like lead, mercury and cadmium we breathe in all the time. Most of this comes from industry and past weapons testing in the 1940’s and 1950’s. These metals also show up in our water supply. They are very dangerous metals and are proven to be toxic. Yet we are still alive.

Silver is not proven to be toxic at all.
There is a condition called argyria. This condition is real and used by organizations to scare people away. Argyria turns the skin a blue/gray color. This is caused from large amounts of impure silver build up in the skin. Impure silver has other material in it that is not supposed to be there like proteins, other metals, salt, etc.

The truth about argyria is that it is extremely rare. The only way to get argyria is to take poorly made impure silver solutions. Dr. Flavin, a former science assistant to the Director of Toxicology at the FDA, made a signed statement that says pure silver solutions are not toxic and admits that silver nanoparticles, are in fact proven to help the immune system. The link to this document is below.

All silver solutions should be nano sized and made from.999 pure silver. Any good pure silver nanoparticle solution provider will state the silver particle size and the ppm (parts per million) amount on the bottle or they will tell you if asked. Some companies have effectively made silver particles at.8 microns which is smaller than a nanoparticle.

Most providers will recommend taking 1/2 a teaspoon or smaller. Any silver that is not used by the body will be expelled through the urine when taken in small amounts.

Silver nano particles working the body.
The immune system can be preoccupied with other germs and bacteria. Even more if there is a virus present. When the immune system is working overtime, this can weaken the bodies defenses and allow germs, viruses and bacteria to grow since the immune system can’t keep up and kill them. This makes us sick.

The introduction of silver nanoparticles. Silver with positive charge viruses and harmful bacteria like negatively charged. Thus, when silver nanoparticles come into contact, it inhibits the viruses and bacteria, and kill them with natural anti-bacterial silver, antibiotics and anti-viral properties. When viruses and bacteria are put out of commission, which makes the natural immune system to grow and grow, what then take care of the rest. Very simple, but very effective.

September 10, 2015

All About Silver Nanoparticles Antimicrobial

Nano-silver antibacterial agent is to achieve nanoscale metal particle elemental silver, about 25 nanometers in diameter mostly. Then the use of special technology, nano-silver into a carrier to form a solution.

Origin
Silver Nanoparticles Antimicrobial originated from the ancient times people began to use, it was found that silver and copper vessels retained water should not deteriorate, and later the palace of your time and get used to eat the rich silver chopsticks, folk and wear jewelry made of silver, Chinese folk very early recognized the silver has antibacterial effect.

Definitions
Refers to the ability of nano-silver antibacterial agent within a certain time, so that certain microorganisms (bacteria, fungi, yeasts, algae and viruses, etc.) necessary to maintain growth or reproduction below the level of chemicals. Nano-silver antibacterial agent is a substance or product has bacteriostatic and bactericidal properties.

Antibacterial principle
Contact reaction antibacterial mechanism: silver ions contact reaction, resulting in the destruction of microorganisms common components or produce dysfunction. When a small amount of silver ions to reach the microbial cell membranes, because the latter with a negative charge, relying on Coulomb attraction, so that the two strongly adsorbed silver ions penetrate the cell wall into the cell, and react with SH groups, so that protein coagulation, damage cells synthase activity, cell death and loss of the ability to proliferate. Silver ions can damage microbial electron transport system, respiratory system and mass transport systems.

Feature
Potent bactericidal, repair and regeneration, broad-spectrum bactericidal, permeability, durability, no drug resistance.

June 15, 2015

Do You Know Antibacterial Silver Nanoparticles?

The antimicrobial activity of Silver Nanoparticles Antimicrobial against E. coli was investigated as a model for Gram-negative bacteria. Bacteriological tests were performed in Luria–Bertani (LB) medium on solid agar plates and in liquid systems supplemented with different concentrations of nanosized silver particles. These particles were shown to be an effective bactericide. Scanning and transmission electron microscopy (SEM and TEM) were used to study the biocidal action of this nanoscale material. The results confirmed that the treated E. coli cells were damaged, showing formation of “pits” in the cell wall of the bacteria, while the silver nanoparticles were found to accumulate in the bacterial membrane. A membrane with such a morphology exhibits a significant increase in permeability, resulting in death of the cell. These nontoxic nanomaterials, which can be prepared in a simple and cost-effective manner, may be suitable for the formulation of new types of bactericidal materials.

There are some bacteria that are not effectively killed by the conventional antibiotics including many strains of gram-negative bacteria. However the innovative world of science and the need of developing an effective way to cope with this situation has lead scientist to manage a new technology in this regard.

Rani Pattabi and her colleagues at Mangalore University, explains in the international journal of nanoparticles that an electron beam when blasted on a silver nitrate solution can generate nanoparticles.

These particles are shown to be effective against gram-negative species that are not affected by conventional antibacterial agents.

The researchers in India also pointed that these silver nanoparticles are effective against gram-positive bacteria, such as resistant strains of Staphylococcus aureus and Streptococcus pneumoniae and also effective for treating gram-negative Escherichia coli and Pseudomonas aeruginosa.The problem that is threatening human health is resistance to the existing conventional antibiotics. Therefore the chemists all around the world are desperately trying to develop newer compounds that can easily be bactericidal for strains such as MRSA (methicillin or multiple-resistant Staphylococcus aureus) and E. coli O157.

Since the ancient times, silver has been renowned for its bactericidal activities.

Therefore a technological advancement in the use of silver means a major step forward and a promise for a wide range of applications of silver as anti bacterial agent in the times where antibiotic resistance is proving to be an obstacle for anti bacterial use. Thus the emergence of silver nanoparticles and other such bacteriostatic agents have become a new industrial revolution.

The experimentation involving the radiations to split the silver compounds to release silver ions that will clump together and form nanoparticles, have been taken as a challenge by the researchers. The target was in fact to get a new approach that avoids the need for costly and hazardous reducing agents and that these can be used to get particles of a controlled size that controls its properties as well.

So Pattabi and colleagues used electron beam technology to irradiate silver nitrate solutions in a biocompatible polymer that was polyvinyl alcohol, to form silver nanoparticles.

The Preliminary tests have shown that silver nanoparticles produced by this straightforward, non-toxic method are indeed highly active against S. aureus, E. coli, and P. aeruginosa.

Now we can imagine that our shoes, socks or even the keyboard we are using may be impregnated with silver nanoparticles that can kill some bacteria and might as well prevent the spread of infection among computer users.

These can be the frontline defenses such as these environmentally benign and cost-effective antibacterial compounds and these can prevent spreading the infections through contact with computer keyboard, phones and other devices.