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UZUN, MUHAMMET

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UZUN

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MUHAMMET

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2012 - 201911
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End date: 2019 × Start date: 2012 ×

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Now showing 1 - 10 of 11
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    PublicationOpen Access
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    Turkish textile raw material and yarn industry
    (2017-07-01) UZUN, MUHAMMET; UZUN M.
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    Study of the pH and physical performance characteristics of silver-treated absorbent wound dressings
    (SAGE PUBLICATIONS INC, 2013) UZUN, MUHAMMET; Uzun, Muhammet; Anand, Subhash C.; Shah, Tahir
    In this study, two common nonwoven fibrous dressings, based on carboxymethylcellulose and alginate, and their silver-treated forms were evaluated in order to compare their performance characteristics including fluid handling capacity, the mechanical properties, and the thermal behavior. The effect of immersing the dressings in the two fluids (solution A and distilled water) on pH was also studied. The results show some clear differences between the untreated and silver-treated dressings, for example the fluid handling and the swelling values of the dressings were reduced due to silver treatment. More considerably, changes were observed in the tensile properties which were decreased when these dressing were treated with the silver. There was no considerable effect on the thermal characteristics of the dressings upon the silver treatment. Statistically significant differences were observed in the pH over time for all tested specimens and also for both test fluids.
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    A novel approach for designing nonwoven hybrid wound dressings: Processing and characterisation
    (SAGE PUBLICATIONS INC, 2016) UZUN, MUHAMMET; Uzun, Muhammet; Anand, Subhash C.; Shah, Tahir
    The paper focuses on the development of novel absorbent nonwoven structures by using natural biodegradable carboxymethylcellulose (CMC), alginate and polylactic acid (PLA) fibres. These fibres have been blended and reinforced with synthetic hollow polyester (HPES), polypropylene (PP) and hollow viscose (HV) fibres. The main aim was to enhance the wicking properties of the structures for minimising the pooling of exudate and maceration. It is also aimed to enhance the integrity of structures to minimise the contamination of wounds due to loose fibres. The incorporation of PLA into wound dressings has been attempted for the first time and their functional properties have been studied. The single-fibre, blended and hybrid fabrics have been engineered. The results demonstrate that HPES reinforcement has a critical importance for CMC fabric in terms of wicking properties, tensile properties and air permeability. It has also been demonstrated that the contribution of PLA in the wound dressings is to enhance the properties such as absorbency, wicking, flexural rigidity and air permeability.
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    3D Printing Artificial Blood Vessel Constructs Using PCL/Chitosan/Hydrogel Biocomposites
    (WILEY-V C H VERLAG GMBH, 2019) YILMAZ, BETÜL; Ulag, Songul; Kalkandelen, Cevriye; Oktar, Faik Nuzhet; Uzun, Muhammet; Sahin, Yesim Muge; Karademir, Betul; Arslan, Sema; Ozbolat, Ibrahim Tarik; Mahirogullari, Mahir; Gunduz, Oguzhan
    The present paper aims to overcome the problems related to previous use of autologous grafts using available synthetic grafts. To examine the optimum of the ideal vessel-like constructs parameters are produced at 230 degrees C. At this production temperature, the elastic modulus values of the constructs ranges from 56 MPa to 174 MPa. The maximum cell proliferation is obtained from PCL/7wt.%CS/5wt.%H that is tested by mitochondrial dehydrogenase activity. The structures are visualized with all constructs after cell fixation by making use of the HUVEC cell line.
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    Effect of Ultrasonic Laundering on Thermophysiological Properties of Knitted Fabrics
    (KOREAN FIBER SOC, 2013) UZUN, MUHAMMET; Uzun, Muhammet
    The paper focuses on the application of ultrasonic energy in textile laundering. In recent years, there has been an increasing interest in ultrasonic energy application in textile industry; however, the effect of ultrasonic laundering on the thermophysiological properties of knitted fabrics has not been studied yet. This study was conducted by using polylactic acid (PLA), cotton, polyethylene terephthalate (PET), and poly acrylic (PAC) fibres containing yarns and their blends. Knitted fabrics, single pique, were made from these yarns by using well knitting machine. The fabrics were washed ten times for 15 and 60 minutes under 40 degrees C by using conventional and ultrasonic washing methods. The main aim was to determine the effect of washing methods on the thermophysiological properties of the fabrics. It is also aimed to analyse and evaluate the thermophysiological properties of the PLA fabrics. The incorporation of 100 % PLA and cotton/PLA yarns into single pique knitted fabrics has been attempted to produce for the first time and studied their thermal comfort properties. The results show that the washing processes have a critical importance for the tested fabrics in terms of thermal conductivity, thermal resistance, thermal absorbtivity, water vapour permeability, and heat loss. It has been also demonstrated that the fabric cleaning by using ultrasonic method enhanced the properties of tested fabrics such as thermal conductivity and % recovery. It was also noted that 15 minutes ultrasonically washed fabrics had significantly lower thermal resistance as compared, to conventionally washed fabrics.
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    The effect of wound dressings on the pH stability of fluids
    (MA HEALTHCARE LTD, 2012) UZUN, MUHAMMET; Uzun, M.; Anand, S. C.; Shah, T.
    Objective: To investigate and evaluate the effect of 20 commercial wound dressings on the pH values of selected fluids upon contact, over a period of 7 days. Method: The effect of the dressings on the pH of two different solutions, solution A (2.298g sodium chloride [NaCl], 0.368g calcium chloride [CaCl2] dihydrate added to I litre of de-ionised water) and distilled water, was investigated over a period of 7 days. Two different methods for contacting fluid with the dressings were used, to simulate wounds with different levels of exudate: i) immersing the dressing in 35ml fluid, and ii) adding 5ml drop-wise onto the dressing's absorbent pad on a daily basis. Results: On immersion of the dressings, the pH values of the fluids changed quite appreciably over time, with similar results for both methods. The lowest pH values were found with the hydrocolloid dressings, for both solution A and distilled water. The foam dressings had an alkaline effect on the fluids; in most cases, they increased the fluid's pH significantly. The non-woven dressings reduced the pH of both fluids to a lesser extent than the hydrocolloid dressings. The hydroactive dressings decreased the pH value of solution A and increased the pH of distilled water. Conclusion: This study demonstrates that the pH values of the fluids are not constant, likely due to the complicated nature of the dressings' chemical structures and designs. Thus, optimisation of pH level to meet the requirements of any specific wound types and healing processes must consider the complex nature of the dressing. The increase in pH value of the wound over time needs to be minimised in order to maximise the effectiveness of the healing therapy.
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    PublicationOpen Access
    Processing and Characterisation of the Copper Treated Polylactic Acid and Cotton Fabrics: Thermophysiological Comfort Properties
    (KAUNAS UNIV TECH, 2014-04-02) UZUN, MUHAMMET; Uzun, Muhammet
    The main objective of this study is to develop a novel copper treatment method and characterise the effect of treatment on the thermophysiological comfort properties of the treated fabrics. It is also aimed to analyse and evaluate the thermophysiological properties of the PLA fabrics. The study was conducted by using polylactic acid (PLA), cotton and their blend yarns. The knitted fabrics, single pique, were made from these yarns by using weft knitting machine. The fabrics were treated with two copper solution concentrations (5 % and 10 %) at 20 minutes ultrasonic energy. The results show that the treatment has a critical effect on the tested fabrics in terms of thermal conductivity, thermal resistance, thermal absorbtivity, water vapour permeability, and heat loss. The results also clearly demonstrated that the PLA fabric was successfully treated with the copper solution, and the coated fabrics showed significant change as compared to their untreated counterparts in terms of tested parameters.
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    Polylactic acid/Sodyum Alginate/Orange Oyster Shell based nanofiber composite design
    (2018-11-08) UZUN, MUHAMMET; EKREN, NAZMİ; OKTAR, FAİK NÜZHET; GÜNDÜZ, OĞUZHAN; CESUR, SÜMEYYE; Uzun M., Cesur S., Ekren N., Oktar F. N., Gündüz O.
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    PublicationOpen Access