RISS 검색 - 국내학술지논문

1
Evaluation of electrospun nanofiber pore structure parameters

Akbar Khodaparast Haghi,Mohammad Ziabari,Vahid Mottaghitalab 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
Nanofibers produced by electrospinning method are widely used for drug delivery, as tissue scaffolding materials and filtration purposes where specific pore characteristics are required. For continued growth in these areas, it is critical that the nanofibers be properly designed for these applications to prevent failure. Most of the current methods only provide an indirect way of determining pore structure parameters and contain inherent disadvantages. In this study, we developed a novel image analysis method for measuring pore characteristics of electrospun nanofiber webs. Five electrospun webs with different pore characteristics were analyzed by this method. The method is direct, very fast, and presents valuable and comprehensive information regarding pore structure parameters of the webs. Two sets of simulated images were generated to study the effects of web density, fiber diameter and its variations on pore characteristics. The results indicated that web density and fiber diameter significantly influence the pore characteristics, whereas the effect of fiber diameter variations was insignificant.
2
A new approach for optimization of electrospun nanofiber formation process

Akbar Khodaparast Haghi,Mohammad Ziabari,Vahid Mottaghitalab 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
Precise control of fiber diameter during electrospinning is very crucial for many applications. A systematic and quantitative study on the effects of processing variables enables us to control the properties of electrospun nanofibers. In this contribution, response surface methodology (RSM) was employed to quantitatively investigate the simultaneous effects of four of the most important parameters, namely solution concentration (C), spinning distance (d),applied voltage (V) and volume flow rate (Q), on mean fiber diameter (MFD) as well as standard deviation of fiber diameter (StdFD) in electrospinning of polyvinyl alcohol (PVA) nanofibers.
3
Simulated image of electrospun nonwoven web of PVA and corresponding nanofiber diameter distribution

Akbar Khodaparast Haghi,Mohammad Ziabari,Vahid Mottaghitalab 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
Fiber diameter is the most important characteristic in electrospun nonwoven webs. Understanding how it is influenced by the electrospinning parameters is essential to produce webs with desired characteristics. In this contribution, Direct Tracking method for measuring electrospun fiber diameter is described. To evaluate the accuracy of the technique, a simulation algorithm for generating webs with known characteristics was employed. To verify the applicability of the method on real samples, an electrospun polyvinyl alcohol (PVA) mat, as a representative of real webs, was used. Since the Direct Tracking method uses a binary image as its input, local thresholding was applied to segment the SEM micrograph of the electrospun web. The results indicate that the method could be used successfully for determining fiber diameter in electrospun nonwoven webs.
4
Distance transform algorithm for measuring nanofiber diameter

Akbar Khodaparast Haghi,Mohammad Ziabari,Vahid Mottaghitalab 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
This paper describes a new distance transform method used for measuring fiber diameter in electrospun nanofiber webs. In this algorithm, the effect of intersection is eliminated, which brings more accuracy to the measurement. The method is tested by a series of simulated images with known characteristics as well as some real webs obtained from electrospinning of PVA. Our method is compared with the distance transform method. The results obtained by our method were significantly better than the distance transform, indicating that the new method could successfully be used to measure electrospun fiber diameter

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