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An in Situ Crystal Growth of Metal Organic Frameworks-5 on Electrospun PVA Nanofibers

Talmoudi H., Khenoussi N., Adolphe D., Said A. H., Schacher L.

Autex Research Journal

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2018

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Vol. 18, no. 3

308--313

EN

In this study, a simple, general and straightforward method for growing metal-organic frameworks (MOFs) crystals directly on nanofibers is presented. A chelating polymer was first blent with metal cation and then electrospun. The obtained nanofibers were immersed in a linker solution. Metal cations were released and the metal-organic frameworks crystals were grown on the fibers’ surface. In this work, this method was tested with polyvinyl alcohol as chelating polymer, Zn2+ as metal cation and Terephthalic acid as linker. The pair cation/linker corresponds to the MOF-5. The latter is a robust metal organic framework formed from Zn4O nodes with 1,4-benzodicarboxylic acid struts between the nodes. SEM images revealed that the MOF-5 nanocrystals have grown along the PVA/Zn2+ nanofibers that served as the crystals’ growth template by providing the Zn2+ ions. This result was also confirmed by infrared spectroscopy, which indicates the presence of characteristic bands of MOF-5 in the modified nanofibers spectrum. Moreover, the X-ray diffraction showed that MOF-5 material was well crystallized on the nanofibers surface according to a cubic symmetry with a space group Fm-3m and a lattice constant a = 25.8849 Å.

2

Frictional Sound Analysis by Simulating the Human Arm Movement

Yosouf K., Latroch H., Schacher L., Adolphe D. C., Zimpfer V.

Autex Research Journal

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2017

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Vol. 17, no. 1

12--19

EN

Fabric noise generated by fabric-to-fabric friction is considered as one of the auditory disturbances that can have an impact on the quality of some textile products. For this reason, an instrument has been developed to analyse this phenomenon. The instrument is designed to simulate the relative movement of a human arm when walking. In order to understand the nature of the relative motion of a human arm, films of the upper half of the human body were taken. These films help to define the parameters required for movement simulation. These parameters are movement trajectory, movement velocity, arm pressure applied on the lateral part of the trunk and the friction area. After creating the instrument, a set of soundtracks related to the noise generated by fabric-to-fabric friction was recorded. The recordings were treated with a specific software to extract the sound parameters and the acoustic imprints of fabric were obtained.

3

Development of Personal Protection Equipment for Medical Staff: Case of Dental Surgeon

Tran T. A. D., Arnold M., Schacher L., Adolphe D. C., Reys G.

Autex Research Journal

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2015

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Vol. 15, no. 4

280--287

EN

During daily oral health care, dental surgeons are in contact with numerous potentially infectious germs from patients’ saliva and blood. Appropriate personal protection equipment should be chosen to mitigate these risks, but the garment must also be comfortable and not hamper activities. This paper presents our research work on optimised working clothing for dentists and discusses some important points in the functional design. Following a consumer study on how users wear the garment and what are their expectations, three main functions were investigated: protection, ergonomics and thermal comfort. Aesthetic appearance was also taken into consideration as it is necessary that the wearer should feel appropriately and attractively dressed in the context of health care. Concerning protection, spray tests in real conditions helped us to localise the potential contamination areas on the garment and led us to select a three-layered material that is protective and breathable enough. However, this part of the garments made from these fabrics exhibited low thermal comfort and the wearer felt some discomfort. In terms of ergonomics, instrumented garments were worn and pressure measurements were taken. The results highlight that a special shape and raglan sleeves should be selected for a better dynamic comfort. Concerning thermal comfort, an infrared camera was used to detect warm zones of the garment where heat and moisture transfers should be enhanced. Breathable, stretchable and shape-retaining knitted fabric that is usually used for sportswear was selected. These fabrics were strategically placed as low and high vents to promote a chimney effect, which minimises retention of heat and humidity inside the garment. The usual PES/cotton fabric was selected for the rest of the gown. Based on these results, a new gown has been proposed. Through fitting tests conducted in a hospital on 25 dentists, it was revealed that the new design was highly appreciated, particularly on the ergonomic structure of the sleeves and thermal comfort of breathable zones. However, some points can be further improved, such as durability of the PES/cotton fabric, the neck length or the shape of ‘breathable zones’. The final product will be produced based on necessary improvements.