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- 저자 : Khashayar Badii (검색결과 2 건)
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Gelayol Golkarnarenji,MINOO NAEBE,Jeffrey S. Church,Khashayar Badii,Alireza Bab-Hadiashar,Stephen Atkiss,Hamid Khayyam 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
Studying the presence and progress offiber defects, such as skin-core structure, is an important tool foranalysis of a chemical process. In this article, the skin core morphology has been analyzed by opticalmicroscopic (OM) images and Fourier transform infrared attenuated total reflectance mapping (FTIR-ATRmapping). The results of FTIR-ATR mapping showed that thefiber is almost uniform in the core area whileOM images are accurate enough to be used for skin-core analysis. Using OM images, the core ratio ofsamples were measured to quantify the skin-core structure. Non-parametric kernel density estimationmethods have then been compared with conventional parametric distribution models using these data. The results reveal that the parametric methods cannot adequately describe the skin-core phenomenonand that the non-parametric distributions are more appropriate for the quantification of skin-coremorphology. By applying the non-parametric distributions, a model has been developed, which describesthe relationship between the skin-core defect and the operation parameters of thefiber production. Thisapproach can be used to predict the probability of skin-core occurrence and can be used to decrease thepresence of this phenomenon in the carbonfibers production industry. Our results show thattemperature is one of the most significant operational parameter at a typical oxygen concentration (in airat atmospheric pressure) governing the skin-core formation.
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Bijan Nasri-Nasrabadi,Akif Kaynak,Cynthia Wong,Pejman Heidarian,Khashayar Badii,Abbas Z. Kouzani 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1
The fabrication of hydrophilic porous hydrogel, with high mechanical strength and good uptake capacity is desirable for a broad range of applications such as drug delivery and liquid sensors. The usual methods are limited to the production of structures with high density of covalently crosslinked networks that restricts the polymer chain rearrangement, resulting in non-uniformed pore size distribution. Covalent networks also limit the activity of functional groups and influence the uptake properties of the polymer. In this study, we proposed simple cyclic cryogelation for the fabrication of hydrogels with uniform pore sizes via controlling the micellization and crystal formation. The chitosan based hydrogels ionically crosslinked with 8 % (w/v) of tripoli phosphate sodium (TPP) displayed high Young’s modulus (63 MPa) after cyclic freezethawing. The liquid uptake capacity of the samples treated with 8 % (w/v) TPP solution at pH 4 showed a slight decrease of about 29 % in comparison to that of non-cyclic processed samples (36 %).
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