Inorganic Antibacterial Material Research Articles

Study on Morphological Structure and Application of Ag-La-Inorganic Antibacterial Material Dying by Microwave

This paper investigated the morphological structure and application of the Ag-La-inorganic antibacterial material. The sol-gel method was used to prepare the carrier: White Carbon Black. Silver ion was selected to be the antibacterial ion, and lanthanum nitrate was selected to be the additive. The morphological structure and application of this new inorganic antibacterial material were characterized by inductively coupled plasma (ICP), scanning electron microscope (SEM) techniques, energy dispersive spectrum (EDS) analysis, antibacterial activity test (Escherichia coli as experimental bacterium) and application experiment. Results showed that the amount of antibacterial ion of the Ag-La-inorganic antibacterial material was higher than that of the general Ag-inorganic antibacterial material. And its bacteriostasis rate was also higher than that of the general Ag-inorganic antibacterial material. Other advantages of this material are its loose and dispersive structure. In addition, this new inorganic antibacterial material showed promising result in rubber.

Mechanism of antibacterial activity of silver and praseodymium-loaded white carbon black

This paper investigated the antibacterial mechanism of the Ag-Pr-antibacterial white carbon black. The sol-gel method was used to prepare the carrier: white carbon black. Silver ion was selected to be the antibacterial ion, and praseodymium nitrate was selected to be the additive. The structure and antibacterial mechanism of this new inorganic antibacterial material were characterized by laser particle size analyzer, scanning electron microscope (SEM) techniques, energy dispersive spectrum (EDS) analysis, and antibacterial activity test (Escherichia coli as experimental bacterium). Results showed that the particle size of Ag-Pr-antibacterial White carbon black was less than 30 μm with a narrow size distribution. Ag + is combined into the white carbon black by both the mode of ion exchange and the mode of adsorption process. The bacteriostasis rate of the Ag-Pr-antibacterial white carbon black was higher than that of the general Ag-antibacterial white carbon black. The antibacterial activity of Ag-Pr-antibacterial white carbon black was caused by the combination of contact and stripping antibacterial mechanism. The result also indicated that this new inorganic antibacterial material had good thermal and light stability.

Synthesis, characterization, and antimicrobial properties of Cu-inorganic antibacterial material containing lanthanum

In this paper a kind of new inorganic antibacterial material: Cu-antibacterial white carbon black containing lanthanum was synthesized. The characterization and antimicrobial effect of the Cu-antibacterial white carbon black containing lanthanum was investigated. Inorganic antibiotic materials comprised the carrier, the antibacterial ion and the additive. In this study, we choosed white carbon black as the carrier, which was compound by a sol-gel method. Copper ion was selected to be the antibacterial ion, and lanthanum nitrate was selected to be the additive. The as-synthesized Cu-La-antibacterial white carbon black was characterized by inductively coupled plasma (ICP), laser particle size analyzer, Fourier transform infra-red spectroscopy (FT-IR) and antibacterial activity test (Escherichia coli as experimental bacterium). Results showed that the amount of antibacterial ions of the Cu-La-antibacterial white carbon black was higher than that for the general Cu-antibacterial white carbon black. Its bacteriostasis rate was about 98% (when the content of Cu 2+ was about 3%), and corresponded to Ag-antibacterial white carbon black (99%). The particle size of Cu-La-antibacterial white carbon black was under 30 μm with a narrow size distribution. Copper ion was bound to white carbon black by ion exchange process. Moreover, this new inorganic antibacterial material showed promising result on the coating surface of metal.

Study on Antibacterial Mechanism of Ag-Inorganic Antibacterial Material Containing Lanthanum

Inorganic antibacterial materials consist of the antibacterial ions, the additives and the carrier. In this study, we synthesized a new inorganic antibacterial material, of which Ag+ was selected to be the antibacterial ion, lanthanum nitrate served as the additives, and the white carbon black was chosen as the carrier, which was prepared by a sol-gel method. The as-synthesized antibacterial material was characterized by inductively coupled plasma, particle size measurement instrument, and enumeration tests. The result showed that this material has loose and dispersive structure, good thermal and light stability. The possible antibacterial mechanism was also proposed through all the experimental data in this study.

Preparation and Characterization of Cu-Inorganic Antibacterial Material Containing Rare Earths

In this study, we synthesized a new inorganic antibacterial material, of which Cu2+ was selected to be the antibacterial ion, cerous nitrate served as the additives, and the white carbon black was chosen as the carrier, which was prepared by a sol-gel method. The as-synthesized antibacterial material was characterized by inductively coupled plasma, particle size measurement instrument, scanning electron microscope and enumeration tests. The result showed that the amount of antibacterial ions and bacteriostasis rate of this new material are higher than those for the common Cu-inorganic antibacterial material without rare earths. In addition, the particle size of this material can be extended down to 20 μm with a narrow size distribution. Other advantages of this material are its loose and dispersive structure.

The self-assembling and application of inorganic antibacterial material made of natural nanoporous carrier

The inorganic antimicrobial material was inhibited to the microbes with the added metal ion, Zn. The primary wet product carrying 5%–10% zinc ion was generated under the following conditions: temperature was 95 °C, solution zinc concentration was 1.2–2.0 mol/L, and the ratio of Zn solution to zeolite weight was 5: 1. The final stable product was manufactured after baking in an oven for 1–3 h at the temperature of 500–900 °C. The baked material was tested for its disinfection effectiveness and coloring effect when mixed with paint coating. Based on the final batch of tests, the zinc content of this anti-microbial product was further optimized.

Antibacterial silver-containing silica glass prepared by sol–gel method

Recently, various inorganic antibacterial materials containing silver have been developed and some of them are in commercial use. Colorless and more chemically durable materials which slowly release the silver ion for a long period are, however, desirable to be developed for medical applications such as composite resin for dental restoration. In the present study, Si(OC 2H 5) 4, Al(NO 3) 3·9H 2O, AgNO 3, HNO 3, C 2H 5OH and H 2O solutions with various Al/Ag atomic ratios under a constant Si/Ag atomic ratio of 1/0.023 were kept at 40°C for gelation and drying. Thus obtained gels were pulverized into fine powders with average particle size of approximately 10 μm and then heat-treated at 900–1000°C for 2 h. For the composition Al/Ag=0, a yellow-colored glass was formed, since the silver existed in the form of metallic colloids in the glass. However, for the compositions Al/Ag⩾1, colorless glasses were successfully obtained, since the silver existed in the form of Ag + ions in the glasses. For the composition Al/Ag=0, the silver ions got released rapidly into the water, whereas, for the compositions Al/Ag⩾1, they gradually got released into the water at a controlled rate. A composite of the obtained powders with Al/Ag atomic ratio of 1 with Bis-GMA/TEGDMA in 70 : 30 weight ratio showed excellent antibacterial property. The sol–gel derived silica glass powders containing silver with compositions Al/Ag⩾1 are believed to be useful as an antibacterial material for medical applications such as filler of composite resin for dental restoration.