Evidence map›Paper›PMID 40775006›Full record

ArticleScientific reports2025

Analysis of effect of thickness and surface treatment on sound transmission loss characteristics of natural fibres.

Methil Vivek Shankar, N H Padmaraj, Sriharsha Hegde, G M Yash, Chandrakant R Kini

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Methil Vivek ShankarDepartment of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
N H PadmarajDepartment of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
Sriharsha HegdeDepartment of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
G M YashDepartment of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
Chandrakant R KiniDepartment of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India. chandra.kini@manipal.edu.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Noise pollution, driven by rapid urbanisation and city expansion, has created a growing demand for innovative and bio-degradable sound absorption materials. Traditional solutions such as synthetic acoustic foams are widely used due to their efficiency and low cost but raise environmental concerns because of their non-biodegradable nature. This study explored the use of natural fibres-coir and sponge gourd-as environmentally friendly alternatives for sound insulation. The research focused on the effect of fibre thickness and surface treatment (using sodium hydroxide (NaOH)) on their acoustic performance. The Fourier Transform Infrared Spectroscopy (FTIR) technique was used to understand the effects of the treatment on the functional groups of the fibre. The surface modification of the fibre surface was studied using an optical microscope, Brumauer-Emmet-Teller (BET) analysis and by analysis of Scanning Electron Microscope (SEM) images. An impedance tube setup was used to measure the sound transmission loss for both the untreated and treated fibres. The results showed that increasing the thickness of both coir and sponge gourd fibres improves transmission loss at lower frequencies but reduces effectiveness at higher frequencies. Surface treatment had a material-dependent effect: sponge gourd fibres showed improved transmission loss due to increased surface roughness and airflow resistivity, whereas coir fibres exhibited a decline in performance after treatment. These findings contribute to a better understanding of how natural materials can be optimised for acoustic applications through structural modifications.

Indexed as

Fibre treatmentNatural fibresSodium hydroxideSound absorptionSustainable materials

Identifiers

PMID40775006
PMCPMC12332092

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.