M. M. ALI1, S. AKTER2, S. TAIRA3, K. KODA3, M. S. FORID4 and Y. URAKI3*
1= Md. Momotaz Ali, Phd Fellow, Graduate School of Agriculture Faculty, Hokkaido University, Japan and Senior Scientific Officer, Bangladesh Jute Research Institute, Manikgonj, Bangladesh, 2Shahinoor Akter , Taz Agro and Dairy Farm, Panchagarh, Bangladesh, 3Shogo Taira, Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan, 3Keiichi Koda, Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan, 4Md. Shakh Forid, Agriculture Extension Officer, Zakiganj, Sylhet, Bangladesh and 3Yasumitsu Uraki, Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
ABSTRACT
This study was conducted at the Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan during 2017 to 2019 to demonstrated dry-electrospinning conditions. Two types of CA (Cellulose Acetate) candidates were tested one from water soluble CA and another one water insoluble CA. An alluminum foil were used as a electro-conductive material as a electrospun fiber collector. The suitable conditions were found: distance between the nozzle and the collector, 10cm; applied voltage, 18kV; rotational rate of collector, 115 rpm; spinning temperature, 28 to 30oC; relative humidity, 20 to 22%. To control the humidity and the room temperature, a dehumidifier and a room heater were used during spinning. Different solvents and several CA concentrations were used during polymer solution preparation and spinning respectively. Organic solvents are selected on the basis of environmental concern accordingly their low hazardous and environmentally tedious effects such as animal and/or human health safety risk. The direct electrospinning of WSCA 11%(w/w) in aqueous ethanol solution [40%(w/w)] and CDA 9%(w/w) in aqueous acetone solution [90%(w/w)] gives best solvent and CA concentration ratio for dry-electrospinning. The electrospining parameters, such as polymer concentration, solvent components, applied voltage, distance between nozzle and collector, room temperature and relative humidity, were optimized by several trials. After trials of electrospinning, the optimal spinning conditions were evaluated from morphology of materials deposited on the aluminum foil over the collector.
Keywords: Electrispinning, Solubility, Solvents, Condition and Morphology.