Modification of Noise Reduction by SiO2 Nanocomposite: The Case of Earplugs
Main Article Content
Abstract
When applying different control measures fail to reduce noise exposure to a safe level, using hearing protection devices (HPDs) becomes necessary. The study aim was to investigate the effect of SiO2 nanoparticles on the noise reduction efficiency of PVC earplugs. PVC polymer of type S-60 as the main matrix and SiO2 with a size of 30 nm were used. The PVC / SiO2 nano-composite was mixed at a temperature of 160 ° C and 40 rpm and samples with 0, 0.2 and 0.5 weight percent of SiO2 nanoparticles were prepared. Samples of earplugs with PVC / SiO2 nanoparticles (0.2; 0.5% by weight) when compared to raw earplugs showed the noise attenuation at low frequencies (125-500 Hz) almost the same as that of the raw earplugs. At high frequencies (2-8 KHz), however, the noise attenuation performance of earplugs with SiO2 nanoparticles increased significantly (P <0.05). The results of the present study showed that samples with SiO2 nanoparticles show a stronger noise attenuation at higher frequencies compared to samples without nanoparticles.
Downloads
Article Details
Journal author rights
In order for Romanian Journal of Acoustics and Vibration to publish and disseminate research articles, we need publishing rights. This is determined by a publishing agreement between the author and Romanian Journal of Acoustics and Vibration. This agreement deals with the transfer or license of the copyright to Romanian Journal of Acoustics and Vibration and authors retain significant rights to use and share their own published articles. Romanian Journal of Acoustics and Vibration supports the need for authors to share, disseminate and maximize the impact of their research and these rights, in Romanian Journal of Acoustics and Vibration proprietary are defined below:
For subscription articles:
Authors transfer copyright to the publisher as part of a journal publishing agreement, but have the right to: Share their article for personal use (manuscript version); retain patent, trademark and other intellectual property rights (including research data); proper attribution and credit for the published work.
For open access articles:
Authors sign an exclusive license agreement, where authors have copyright but license exclusive rights in their article to the publisher. In this case authors have the right to: share their article in the same ways permitted to third parties under the relevant user license; retain patent, trademark and other intellectual property rights (including research data); proper attribution and credit for the published work.
Rights granted to Romanian Journal of Acoustics and Vibration
For both subscription and open access articles, published in proprietary titles, Romanian Journal of Acoustics and Vibration is granted the following rights:
- The exclusive right to publish and distribute an article, and to grant rights to others, including for commercial purposes;
- For open access articles, Romanian Journal of Acoustics and Vibration will apply the relevant third party user licence (Open access licencses) where Romanian Journal of Acoustics and Vibration publishes the article on its online platforms;
- The right to provide the article in all forms and media so the article can be used on the latest technology even after publication;
- The authority to enforce the rights in the article, on behalf of an author, against third parties, for example in the case of plagiarism or copyright infringement.