Linghui Peng

Microwave-assisted coating of silver nanoparticles on bamboo rayon fabrics modified with poly(diallyldimethylammonium chloride)

Silver nanoparticles were coated on bamboo rayon fabrics (fabrics made from filaments of dissolved and regenerated bamboo pulp fibers) modified with poly(diallyldimethylammonium chloride) (PDDA) under microwave radiation. The silver nanoparticle coated bamboo rayon fabrics modified with PDDA were characterized by fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, atomic force microscope and scanning electron microscope. Color properties, ultraviolet (UV) protection, softness and contact angle of the silver nanoparticle coated bamboo rayon fabrics were evaluated. The results show that PDDA is successfully modified on the bamboo rayon fabric. Compared with the bamboo rayon fabrics without PDDA modification, more silver nanoparticles are coated on the bamboo rayon fabrics modified with the PDDA. In addition, the bamboo rayon fabric modified with PDDA is evenly covered with silver nanoparticles. The silver nanoparticle coated bamboo rayon fabric modified with PDDA shows the excellent UV protection with UPF of 223.88 and the hydrophobic property with contact angle of 127°. PDDA modification improves the adhesive strength between silver coating and bamboo rayon fabric.

Preparation of silver/reduced graphene oxide coated polyester fabric for electromagnetic interference shielding

In this study, silver/reduced graphene oxide (Ag/RGO) coated polyester (PET) fabrics with dopamine as adhesive agent were prepared through an efficient chemical reduction method under microwave irradiation. The as-synthesized samples were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy. Deposit weight, surface resistance and electromagnetic interference (EMI) shielding effectiveness (SE) of the Ag/RGO coated PET fabric were investigated. The dopamine modified PET fabric is covered with silver particles and reduced graphene oxide (RGO) sheets uniformly and densely. In addition, the Ag/RGO coated fabric possesses high electrical conductivity with low surface resistance of 0.678 Ω sq−1 and EMI SE of Ag/RGO coated fabric ranges from 58 dB to 65 dB in the range of 1–18 GHz X-band. Adhesive strength between Ag/RGO particles and PET fabric is significantly improved.

Synthesis of silver nanoparticles on bamboo pulp fabric after plasma pretreatment

Silver nanoparticles were synthesized on bamboo pulp fabric with pretreatment of plasma under microwave radiation. The silver nanoparticles coated bamboo pulp fabrics were characterized by Fourier transform infrared spectroscopy, scanning electron microscope, thermogravimetric analysis and X-ray diffraction. Color characteristics and contact angles of silver coated bamboo pulp fabrics were evaluated. Adhesive strength of silver nanoparticles on bamboo pulp fabrics without and with pretreatment of plasma was investigated. Compared with silver nanoparticles coated bamboo pulp fabric without pretreatment of plasma, more silver nanoparticles are coated on the bamboo pulp fabric with pretreatment of plasma. Bamboo pulp fabrics are evenly covered with silver nanoparticles with pretreatment of plasma. In addition, influences of distance between the plasma source and the fabric and treating time on deposition amounts of silver nanoparticles were investigated. Color strength values decrease and increase with the rise of distance and treatment time, respectively. The silver nanoparticles coated bamboo pulp fabric pretreatment of plasma has excellent UV protection, good fastness to laundering and hydrophobicity.

Silver nanoparticles coating on silk fabric with pretreatment of 3-aminopropyltrimethoxysilane in supercritical carbon dioxide

Silk fabric was pretreated with 3-aminopropyltrimethoxysilane (silane) in supercritical carbon dioxide and then silver nanoparticles were synthesized on the pretreated silk fabric under microwave irradiation. The silver nanoparticle coated fabrics were characterized by Fourier transform infrared spectroscopy, scanning electron microscope, and ultraviolet–visible spectroscopy. Deposition rate and color characteristics of the silver coating of samples were investigated. The results show that silver-coated silk fabric with pretreatment of the silane via supercritical carbon dioxide possesses excellent ultraviolet protection, softness and the adhesive strength between silver coating and silk fabric is improved.

Preparation and characterization of copper-coated polyester fabric pretreated with laser by magnetron sputtering

Laser treatment is a high-efficiency coating process with many advantages of stable performance, convenient operation and environmental friendly. In this study, an efficient method for the pretreatment of polyester fabric, based on exposure to the output from a CO2 laser, is investigated. Polyester fabrics were treated by laser and then copper films were coated on the surface of treated polyester fabrics by magnetron sputtering method. Copper-coated polyester fabrics were characterized by XRD and SEM. Contact angle, heat generation and electrical conductivity of copper coated polyester fabric were tested. The electrical conductivity, UPF value and contact angle of copper-coated polyester fabric with pretreatment of 6.5 W lasers are 0.239 Ω/sq, 147.4, and 128.5°, respectively. The temperature of copper-coated fabric can be kept at 25.8℃ using only 5 V. The results suggest that the copper-coated polyester fabric with pretreatment of laser has excellent electrical conductive property, hydrophobicity, UV blocking, and heat generation properties. The adhesion strength between copper coating and fibers is improved after laser treatment. Laser can be potentially used in pretreatment of fabrics before coating in the future.

Silver nanoparticle coating on cotton fabric modified with poly(diallyldimethylammonium chloride)

Silver nanoparticles were coated on cotton fabric modified with poly(diallyldimethylammonium chloride) (PDDA). The synthesised silver nanoparticles were characterised by transmission electron microscopy and ultraviolet–visible (UV–Vis) spectroscopy. The silver nanoparticle coated cotton fabrics modified with PDDA were examined by X-ray photoelectron spectroscopy and scanning electron microscopy. The effects of concentration of PDDA in the pretreatment solution on colour characteristics and UV transmittance of the silver nanoparticle coated cotton fabrics modified with PDDA were investigated. Colour fastness of silver coated cotton fabrics modified with PDDA was also evaluated. The results show that the PDDA modified cotton fabrics are covered with dense silver nanoparticles. Colour strength of the silver nanoparticle coated cotton fabric modified with PDDA increases with the rise of concentration of PDDA in pretreatment solution. The incorporation of PDDA improves washing fastness of silver nanoparticle coated cotton fabrics.

Preparation and characterization of lotus fibers from lotus stems

Abstract Lotus stems were treated with sodium hydroxide followed by sodium chlorite to prepare lotus fibers. The lotus fibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), and thermogravimetric (TG) analysis. The crystallinity and crystallinity index of lotus fibers are 62.11 and 62.29%, respectively. The content of cellulose in lotus fibers after being purified with sodium chlorite is improved and reaches 69.74%. The moisture regain of lotus fibers was studied and the results show that moisture regain of purified lotus fibers is 6.87%. The influences of concentration of sodium chlorite on tensile strength and breaking elongation of lotus fibers were investigated. The tensile strength and breaking elongation of lotus fibers both decrease as the concentration of sodium chlorite increases. The results are expected to provide valuable guidance for preparing lotus fibers from lotus stems through chemical treatment.

Fabrication and Characterization of Photochromic Spirooxazine/Polyvinylidene Fluoride Fiber Membranes via Electrospinning

In this study, photochromic spirooxazine material of N-methyl-3,3-dimethyl-9’-hydroxy-spiro [2H-indole-2-[3H] naphtho [2,1-b] [1,4] oxazine] was synthesised. Spirooxazine/PVDF fiber (SPF) membranes with different contents of spirooxazine were successfully prepared by electrospinning. The SPF membranes were characterised by FTIR and SEM. The photochromic properties and contact angle of the SPF membranes were evaluated. The results show that the SPF membranes change from colorless to blue when exposed to UV light, but they revert to their original colour after the UV light disappears. The colour difference and contact angle of the SPF membranes firstly increase and then decrease with a rise in the content of spirooxazine.

Effects of sodium hydroxide treatment on microstructure and mechanical properties of lotus fibers

Lotus fibers were prepared from lotus stems through being treated with sodium hydroxide. The lotus fibers were characterized by scanning electron microscopy (SEM), fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD) and thermal analysis (TG and DTA). The results indicate that the length of lotus fibers ranges from 3.52 cm to 5.80 cm and the width of lotus fibers ranges from 50 μm to 90 μm. Lotus fibers belong to celluloses fiber with cellulose I structure and the crystallinity of lotus fibers is 48.50 %. The lotus fibers consist of cellulose, lignin, hemicellulose, pectin, lipid and water-soluble substances. The effect of concentration of sodium hydroxide, time and temperature of treatment on removal of impurities, fineness and breaking strength of lotus fibers were investigated. The results suggest that the removal of impurities and breaking strength increase with the rise of concentration of the sodium hydroxide, time and temperature of treatment, respectively. However, the fineness of lotus fibers decreases with an increase in concentration of the sodium hydroxide, time and temperature of treatment. The results are expected to provide valuable guidance for preparation of lotus fibers through simple treatment with sodium hydroxide, which can be applied in textile industry.

Preparation and photocatalytic activity of bismuth tungstate coated polyester fabric

Bi2WO6 particles were prepared and then coated on the polyester fabric. Surface morphology, crystal structure, and chemical structure of the Bi2WO6 particle coated polyester fabric were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Photocatalytic activity was evaluated by the degradation of methylene blue (MB) under ultraviolet light irradiation. Influences of the different concentrations of Bi2WO6 on the deposit weight and the photocatalytic activity of the Bi2WO6 particle coated polyester fabric were investigated. In addition, UV protection of the Bi2WO6 particle coated polyester fabric was examined. The results show that Bi2WO6 particles are uniformly coated on the surface of the polyester fabric. The Bi2WO6 particles coated on the polyester fabric are irregular and are orthorhombic. In addition, the Bi2WO6 particle coated polyester fabric exhibits excellent photocatalytic activity and UV protection. The average degradation efficiency of MB in the presence of the Bi2WO6 particle on the polyester fabric coated with 10 g/l Bi2WO6 reaches 98.6 % after being illuminated for 7 h. Therefore, the Bi2WO6 particle coated polyester fabric shows excellent photocatalytic stability for dyes degradation.