Browsing by Author "Temesgen, Alhayat Getu"
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Publication A comparative study on the acoustic absorption properties of green synthesis cellulose nano enset fibers(Springer, 2023-11-04) Temesgen, Alhayat Getu; Eren, Recep; EREN, RECEP; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; CPO-1051-2022Natural fibers are becoming a valid alternative to most commercially used synthetic fibers in sound absorbing materials. In recent years, natural fibers have been considered as valid raw materials for producing ecofriendly sound absorbing materials at low cost. This paper presents a new study on enset nanofiber sound absorbing material which was prepared by enzyme treatment and mechanical hammering of the surface of enset woven fabric. Enset nano fiber (ENF) was fabricated by defibrillation of underutilized abundant byproduct fibers from the surface of enset woven fabrics into micro and nano-scale fibers by alpha-amylase enzyme treatment and then mechanical hammering. The purpose of this approach is that the product will be economic and environmentally friendly and also consumption of eco-friendly products is a serious concern of researchers and policymakers. The study was conducted by using impedance tube method and the sound absorption properties of enset micro and nanofibers in a frequency range of 1000 to 6000 Hz were studied by changing the diameter, thickness and percentage of enzyme concentration during fiber treatments. Parameters for enset nanofibers were: number of board layers (single, double, triple and fourth-layer having sample thickness of 10-13 mm), fine fiber size (micro and nano meter), and fine fiber treatments content (10, 15 and 20% w/v), pressing time (10 min), board density (0.95 g/cm3), press pressure (40 kg/m2) and press temperature (180 degrees C) were held constant. The experimental results revealed that at the same frequency (4500 Hz), the sound absorption coefficient value was improved by 176 and 213% when neat enset fabric was treated and hammered with 10 and 20 w/v % concentration of amylase enzymatic respectively. The maximum sound absorption of neat enset fabric and enset nanofibers was recorded as 0.47 and 0.99 around 5351 Hz respectively. These results indicate that the acoustic property of enset fiber was improved by 47% when neat enset fiber was converted into green enset nanofiber forms by enzyme treatment and mechanical hammering. The experimental results shown that green synthesis of fine fibers from the surface of woven fabric improved the maximum acoustic peak values by 43% (microscale) and 59% (nanofiber) compared with macroscale enset fibers. These simple and cost effective green cellulosic enset nanofiber formations would have a promising result for small scale acoustic enterprises.Publication Evaluation of enset fabric reinforced green composite as sound absorber structure(Ege Universitesi, 2021-04-01) Temesgen, Alhayat Getu; Eren, Recep; Aykut, Yakup; Süvari, Fatih; Temesgen, Alhayat Getu; EREN, RECEP; AYKUT, YAKUP; SÜVARİ, FATİH; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Tekstil Mühendisliği Bölümü; Bursa Uludağ Üniversitesi, Mühendislik Fakültesi, Tekstil Mühendisliği Bölümü; 0000-0001-5708-7993; 0000-0002-5263-1985; 0000-0001-9389-0281; 0000-0001-7841-2281; JDH-9222-2023; CPO-1051-2022; JTV-2018-2023; N-1770-2019Noise is a problem that should be reduced in a variety of places. Fibrous structures are some of the most commonly used materials for sound absorption applications. Enset fibers have a limited use in technical textile applications especially in packaging sector and are mostly left as an agro waste materials. The aim of this research work was to investigate the acoustic property of this new alternative natural fiber (fabric) and its green composite material. The sound absorption performance of enset fabric and its green composite was determined with impedance tube method. The porosity and void structure of enset fibers were studied by scanning electron microscope (SEM) for analysis of enset fabric and enset fabric reinforced composite sound dissipation mechanism. The sound absorption coefficient of enset fabric could only reach to 0.5 level with 5 layers of enset fabric after 3500 Hz frequency. Composite structures with increasing number of fabric layers decreased sound absorption frequency interval. With 5 layers composite (5 fabric layers in the composite), a sound absorption coefficient remained over 0.5 at a large frequency interval between 2830 and 6000 Hz while it was reaching to 0.9 at around 2500 Hz frequency. Increasing the ratio of bio resin to enset fabric caused the sound absorption behavior of composite material tend to shift from higher to medium frequency regions.Publication Green synthesis of cellulosic nanofiber in enset woven fabric structures via enzyme treatment and mechanical hammering(E.u. Printing And Publishing House, 2021-01-01) Eren, Recep; EREN, RECEP; Temesgen, Alhayat Getu; Aykut, Yakup; AYKUT, YAKUP; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Anabilim Dalı.; JTV-2018-2023The rapid development of technology in textile industries has been improving textile finishing properties such as durability, water replants and breathability. Enset is effectively un-utilized agro-waste fiber composed of cellulose, hemicellulose and lignin, which are resemblance to banana fibers. This paper focused on the utilization of enset waste materials for the production of nano fiber. Enset nano fiber (ENF) was fabricated by defibrillation of raw fibers from the surface of enset woven fabrics into micro and nano-scale fibers by a-amylase enzyme treatment and then mechanical hammering. Instead of sandwiching the nanofiber mats between conventional woven fabrics, in this research work, nanofiber mats were manufactured on the surface of the conventional woven fabrics. This top-down nanofabrication approach is simple, cost-effective and environmentally friendly nanofiber manufacturing technique from the surface of woven fabric structures. Fiber characterization was done by fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The surface area, pore size and pore volume of enset nano fiber was analyzed by brunauer, emmett and teller (BET). The test results revealed that nano fiber fabrication was significantly affected by the used enzyme concentration and applied mechanical power. Enset micro fiber was formed when 10 % (w/v) concentration of alpha-amylase enzymatic treatment was applied while enset nano fibers were formed when the enzyme concentration was increased to 15% - 20 % (w/v). The FTIR results revealed that hemicellulose and lignin were effectively removed and fine fibers were defibrillated from the crystal structure of enset woven fabrics. The SEM microscopic image also confirmed the formation of the enset nano fiber ranges from 660nm-63 nm.Publication Investigation of mechanical properties of a novel green composite developed by using enset woven fabric and bioresin materials(Springer, 2023-07-12) Temesgen, Alhayat Getu; Eren, Recep; EREN, RECEP; Aykut, Yakup; AYKUT, YAKUP; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; JTV-2018-2023The developments of environmental concerns and regulations have pushed most of the composite industries to revisit natural resources. They have focused on natural fibers as a reinforcing material having low cost, low density and good mechanical strengths. Enset woven fabric is manufactured from enset fibers, which are abundantly available, light weight (1.2 g/cm(3)), moderate moisture content (10%) and biodegradable un-utilized new fiber under Ensete Ventricosum family. This research work focused on investigating mechanical properties of a new green composite fabricated by enset woven fabric reinforcement and specially prepared bioresin from plant gums. The tensile strength of the enset fabric was improved four times from 528 to 2074 N in single-layer composite structure, while double-layer composite tensile strength was obtained as 3480 N. The test results indicated that the laboratory-made bioresin matrix from acacia and frankincense gums had a significant effect on the mechanical strength of composite structures compared with enset fabrics having the same number of threads (warps) in the specimens. Increasing the grammage of bioresin restored energy and improved the performance of tensile and flexural strength by reducing the deformation of composite structures. Generally, this study revealed that enset woven fabric as reinforcing structure and mixed acacia-frankincense bioresin as a matrix materials had a promising result to be used as composite materials in light weight structural applications with the same potential to improve its performance.Item A research on the use of enset woven fabric structures for the applications of sound absorption and biodegradable composite material development(Bursa Uludağ Üniversitesi, 2021-07-06) Temesgen, Alhayat Getu; Eren, Recep; Aykut, Yakup; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Tekstil Mühendisliği Anabilim Dalı.; 0000-0001-7841-2281Tekstil endüstrilerindeki yeni gelişmeler, boyutsal stabilite, su emicilik, nefes alabilirlik gibi tekstil kumaşları ve bitim özelliklerinin performansını geliştirmektedir. Tekstil liflerinin yapıları ve özellikleri; kompozitlerin yanı sıra iplikler, kumaşlardan oluşan malzemelerin mekanik özellikleri üzerinde büyük bir etkiye sahiptir. Uzun süredir metaller, en çok tercih edilen yapı malzemeleri olarak kullanılmıştır. Bununla beraber; insanların hızla büyüyen talepleri, araştırmacıları yüksek spesifik mukavemet ve elastisite modülüne sahip yeni kompozit malzemelerin geliştirilmesine itmiştir. Petrokimya ürünleri, sadece çevre dostu olmayan ürünler olmayıp aynı zamanda üretim, kullanım ve atıkların yok edilmesi süresince ciddi sağlık problemlerini oluşturmaktadır. Son zamanlarda araştırmacılar ve üreticiler, yeşil kompozit uygulamalar için yaprak, gövde ve meyvelerden özütü elde edilen doğal lif takviyeli kompozit malzemeler üzerinde araştırmalarını odaklamıştır. Doğal lifler, doğada bol miktarda bulunur, hafif, düşük maliyetli ve konvansiyonel lifler içerisinde iyi mekanik mukavemete sahip olan yenilenebilir doğal malzemelerdir. Doğal kaynaklardan elde edilen takviye ve matriks elemanları olarak kullanılan sentetik lifler ve reçinelerin yeri, kompozit malzeme sektörlerindeki ekonomiksel, sağlık sorunları ve çevresel problemleri önlemesine iyi alternatiftir. Bu doktora tezi çalışmasında, hafif nitelikli yapı uygulamaları için mekanik özelliklerinin geliştirilmesi ile yenilikçi tekstil kumaşları takviyeli yeşil kompozit malzemelerin karakterizasyonu ve araştırması üzerine odaklanılmıştır. Tekstil kumaşları, bu çalışmada takviye elemanları olarak kullanılmıştır. Yeni biyoreçine elemanları, 75:25, 70:30, 65:35, 60:40, 55:45 and 50:50 gibi çeşitli oranlarla Akasya tortillas ve Bosveliya papirifera karışımıyla hazırlanmıştır. Dokuma kumaş konstrüksiyonu ve çok katlı kumaş takviyeli yeşil kompozit malzemelerin, mekanik ve akustik performansları çalışılmıştır. Ayrıca nano lifler, α-amilaz enzim ön terbiyesi ve mekanik öğütmeyle üretilmiştir. Bu nanolifler; yüksek boyutsal stabilite, spesifik mukavemet, daha geniş yüzey alanı ve biyobozunabilir ürünler gibi benzersiz özelliklere sahip daha gelişmiş tekstil yapılarının üretilebilmesi için kullanılacaktır.