YINCHUN FANG^a, XINHUA LIU^a,b,*, XU YANG^a, CUIE WANG^a,*

Journal of Polymer Materials, Vol.36, No.2, pp. 111-119, 2019, DOI:10.32381/JPM.2019.36.02.1

Abstract Enzymes are green biocatalysts which have been widely used in many fields. Immobilization enzymes on nanofibrous membrane possessed easy recycling and high stability which would broaden their applications. Covalent immobilization of lipase could endow them higher stability than other protocols. In this study, a novel nanofibrous membrane containing epoxy groups and hydrophilic polyethylene oxide branch was used as a support for lipase immobilization. The immobilized lipase was used as the biocatalyst to catalyse Rap. stroermer reaction. The results showed that it obtained the high product yield of 88% when the volume ratio of methanol and water was 4:1, the dosage… More >

Alicia Mujica-Garcia^1,2, Iván Navarro-Baena¹, José Maria Kenny^1,2, Laura Peponi^2,*

Journal of Renewable Materials, Vol.2, No.1, pp. 23-34, 2014, DOI:10.7569/JRM.2013.634130

Abstract The main aim of this research is the production of different biopolymeric fi bers by electrospinning and the determination of the optimum working parameters for each polymer analyzed. In particular, three different biopolymers have been studied: poly(lactic acid) (PLA), poly(ε-caprolactone) (PCL) and a synthesized poly(ester-urethane) based on a synthesized PLA-b-PCL-b-PLA tri-block copolymer. This research is focused on the analysis of the infl uence of the processing parameters, such as the concentration and fl ow-rate of the polymer solution and the applied voltage, as well as the physico-chemical properties of the polymers used, on the fi ber formation and crystallization behavior.… More >

Alvaro Iregui¹, Lourdes Irusta^1,*, Loli Martin², Alba González¹

Journal of Renewable Materials, Vol.3, No.1, pp. 44-48, 2015, DOI:10.7569/JRM.2014.634128

Abstract In this work, solution electrospinning technique was used to produce biodegradable fi bers using a commercially available polyester (Ecofl ex F Blend C1200). These materials (mats) could be of potential interest in tissue engineering. The effect of polymer concentration and the solvent nature on the obtained morphology was related to the wettability of the mat, characterized by water contact angle measurements. According to the results, the electrospun mats presented water contact angles characteristic of hydrophobic surfaces. More >

MARÍA G. FLORES-SÁNCHEZ^1,*, ROBERTO OLAYO², J. MORALES-CORONA², ATLÁNTIDA M. RAYA-RIVERA³, DIEGO R. ESQUILIANO-RENDÓN³

BIOCELL, Vol.46, No.3, pp. 829-836, 2022, DOI:10.32604/biocell.2022.016988

Abstract This article presents the construction of scaffolds composed of polylactic acid (PLA) with different concentrations of hydroxyapatite (HA) by electrospinning, which were superficially modified with polypyrrole (PPy/I) by plasma polymerization. A preliminary study was conducted of the biological and mechanical behavior of the scaffolds when they were implanted in the back of rabbits for 30 days; bone cells differentiated from mesenchymal stem cells (MSCs) were used. The bone cell and scaffold structures were characterized by histological, immunohistochemical, and mechanical stress tests. Hematoxylin–eosin staining showed good tissue conformation. The immunohistochemical tests highlighted the presence of the main bone tissue proteins, such… More >

Xiaoxia Li^1,2, Manyu Qian², Dan Tian³, Jihuan He^2,3,*

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.6, pp. 1015-1019, 2021, DOI:10.32604/fdmp.2021.015430

Abstract Needleless electrospinning is a versatile method to produce nanofibers. In particular, the rotary version of this technique has enjoyed widespread use because there is no need to clean the spinneret. The rotation speed is limited by the potential deviation of the jet due to the centrifugal force. Other limitations are due to the fast volatilization of the solvent from the opened spinning system. In order to overcome these drawbacks, here a novel reciprocating system based on a moving spinning-plate is proposed. The spinning process is implemented in a half-closed system with the spinning-plate immersed in the solution tank. When the… More >

Dan Tian^1,*, Danni Yu², Chunhui He³

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.4, pp. 711-720, 2021, DOI:10.32604/fdmp.2021.014290

Abstract In the search for sustainable alternatives to harmful synthetic fibers, an increasing amount of research focuses on biomimicry and natural fibers. Sea silk is an exceptional textile material. It is a kind of natural silk produced using the long silky filaments secreted by a specific bivalve mollusk (Pinna nobilis); now at edge of extinction. This paper suggests a simple but effective way to prepare artificial sea silk from Mytilus edulis. A sea silk solution is prepared using a Mytilus edulis protein, and a polyvinyl alcohol (PVA) solution is mixed with the sea silk solution in order to produce artificial sea… More >

Hao Dou^1,2,*, Hongxia Liu^1,2, Feng Wang^1,2, Yanli Sun^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 629-638, 2021, DOI:10.32604/fdmp.2021.015612

Abstract Electrospinning is a versatile and popular method for the fabrication of ultrafine fibers and many parameters in electrospinning can be adjusted when ideal micro/nanofibers are required. In particular, the selection of a proper solvent condition is a fundamental and crucial step to produce electrospun ultrafine fibers. In this study, a commonly used biomaterial, polylactic acid (PLA), was dissolved in 7 different solvents and PLA micro/nanofibers were prepared by electrospinning. The morphology, porosity, mechanical property and static contact angle were characterized to determine the quality of the obtained product. The results show that different solvent conditions have a significant effect on… More >

Daniel Cônsoli Silveira^1,*, Tiago Teixeira da Silva Braga¹, Daniel Molina Gil¹, Newton Adriano dos Santos Gomes², Lilia Müller Guerrini³, Edson Cocchieri Botelho¹

Journal of Renewable Materials, Vol.7, No.3, pp. 279-287, 2019, DOI:10.32604/jrm.2019.01834

Abstract This study investigated and defined the optimal processing parameters for the electrospinning of polysulfone polymer solutions with N,N-dimethylacetamide. Variation of parameters such as solute concentration, electrical voltage, and working distance were correlated with the quality of the obtained nanofibers using morphological characterization via scanning electron microscopy (SEM). Carbonyl iron additive was dispersed in the polymer solutions, using ultrasonic tip, and the material processed via electrospinning with aforementioned parameters defined. Nanofibers with the property of interaction with electromagnetic waves were obtained. The dispersion of different concentrations of the additive and electromagnetic characterizations in the X-band of microwaves (8.2 and 12.4 GHz),… More >

Idalba A. Hidalgo A.^∗, Felipe Sojo^†, Francisco Arvelo^†, Marcos A. Sabino^∗,‡

Molecular & Cellular Biomechanics, Vol.10, No.2, pp. 85-105, 2013, DOI:10.3970/mcb.2013.010.085

Abstract The electrospinning technique is a method used to produce nano and microfibers using the influence of electrostatic forces. Porous three dimensional networks of continuous and interconnected fibers as scaffolds were obtained from a poly (lactic acid) solution. The concentration of the polymeric solution, 12.5% m/w, as well as the conditions of voltage (V=11kV) and tip-metallic collector distance (H=13cm) were established to develop these scaffolds through the electrospinning process. The characteristics of the scaffolds, such as fiber diameter, sintering and the biomimetics of the characteristics of a native extra cellular matrix were verified by Scanning Electron Microscopy (SEM). The orientation induced… More >