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This study describes the preparation of a novel chelating cotton fiber adsorbent, ammoniated cotton fiber (ACF), which was prepared by modifying cotton fiber with amino-HBP using glutaraldehyde as a cross-linking agent. This new adsorbent was characterized and analyzed for amine content, and by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The capacity of ACF to adsorb Cu(II) from aqueous solution was evaluated at different pHs, contact times and initial metal ion concentrations. The results showed that ACF was effective in removing of Cu(II) from aqueous solutions and the adsorption amount of Cu(II) reached 16.7374 mg g-1. The adsorption isotherm and kinetics were well fitted to the Langmuir model and the pseudo-second-order model, respectively. The adsorption amount calculated using the pseudo-second-order model was in good agreement with the experimental data. [ABSTRACT FROM AUTHOR] more...

The article focuses on the preparation of a novel adsorbent by grafting amino-terminated hyperbranched polymer to cotton fibers and the adsorption of heavy metal ions from aqueous solution. The prepared novel adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The experimental results show that the amino-terminated hyperbranched polymer was grafted to the oxidized cotton fibers, and the adsorbent with amino-terminated hyperbranched polymer was successfully obtained. The grooves on the surface of the grafted cotton fiber were filled with amino-terminated hyperbranched polymer. The adsorption experiments show that the adsorption amount of Cu2+ and Pb2+ was up to 16.1 mg/g and 13.4 mg/g with the metal ion concentration of 319.5 ppm and 315.9 ppm, respectively. When the dosage of adsorbent was 1.5 g in 100 mL metal ion solution, the adsorption rate of Cu2+ and Pb2+ reached 73.5 wt. % and 71.2 wt.%, respectively. The use of the adsorbent for the removal of metal ions is considered to be efficient and have great potential for practical applications. [ABSTRACT FROM AUTHOR] more...

A gold nanoparticles (NPs) polymeric hybrid was prepared through the reaction between HAuCl4 and polyamide network polymer (PNP). The PNP has three-dimensional 'nanocage' structures and reactive amino groups incorporated in the molecular cages, so that the gold NPs can be in situ synthesised and fixed in the molecular nanocages. Owing to the volume confinement effect and the protection of the molecular nanocages, the size and the stability of the gold NPs can be controlled in a better manner. In addition, the size of the gold NPs can be tuned by changing the quantity of the precursor of the gold NPs encapsuled in the cages. Through this strategy, gold NPs with average diameters at 13.32, 11.41, 6.25 and 3.23 nm, were synthesised. These size tunable gold NPs polymeric hybrids may have a wide range of applications in many fields such as biomedicine, catalysis and optoelectronics. [ABSTRACT FROM AUTHOR] more...

In this study, a chitosan nanoparticle dispersion solution as a novel multifunctional agent was developed to modify Antheraea pernyisilk. An ionization gelation methodology with chitosan and sodium tripolyphosphate STPP was used to prepare the chitosan nanoparticle solution, and then, Fourier transform infrared spectra, laser particle size analysis, and transmission electron microscopy TEM were used to characterize the structure and size distribution of the chitosan nanoparticles. The peaks at 3390.7, 1633.7, 1538.2, and 1258.1 cm−1revealed the reaction between the chitosan and STPP molecules in the chitosan nanoparticles. The average size of the nanoparticles in the aqueous dispersion solution was approximately 20 nm. TEM images clearly showed the round spherical morphology and the distribution of the particles in the solid state. The obtained chitosan nanoparticle dispersion solution was then applied to treat silk filaments and fabric. The results indicate that the surface of the chitosannanoparticletreated A. pernyisilk fiber was rougher than that of the chitosantreated and untreated ones, and a higher specific surface was achieved. In addition, the antibacterial activity, breaking strength, and wrinkleresistance properties of the chitosannanoparticletreated A. pernyisilk fabric were also enhanced. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 [ABSTRACT FROM AUTHOR] more...

CuII complex bamboo pulp fabric CBPF was prepared by treating bamboo pulp fabric with the copper liquor. Washing fastness and the releases of CuII were measured by the washing test. Antibacterial performance of CBPF against Escherichia coliand Staphylococcus aureuswas evaluated. The morphology of CuII on the fiber surface was characterized with scanning electron microscope. FTIR spectroscopy and Xray photoelectron spectrometry were used to detect the chemical bonding between CuII and cellulose. Xray diffraction, thermogravimetry and mechanical test were used to investigate the effect of CuII on the crystallinity, thermal stability, and mechanical property of bamboo fabric. The results showed that CuII ion was bonded to fiber surface, especially via forming metal complex with hydroxyl of cellulose, and the resultant complex CBPF demonstrated excellent antibacterial activity and good thermal stability. In comparison with those of the bamboo pulp fabric in the condition that mechanical properties have no significant change, the crystallinity was decreased from 44.8 to 40.5 after treatment. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 [ABSTRACT FROM AUTHOR] more...

Hyperbranched polyglycerols (HPGs) was firstly employed for mediating self-assembly of Fe3O4 nanoparticles to form Fe3O>4 nanorods based on an oleic acid (OA)-alcohol-water system. Since the aggregation of Fe3O4 nanoparticles achieved one-by-one assembly induced by HPGs, the resulting Fe3O4 nanorods show a complete structure and high crystallinity, especially when the solvo-hydrothermal process was performed at 180°C for 16h. [ABSTRACT FROM AUTHOR] more...

A new silk material with three-dimensional coil structure was obtained by physical twisting and chemical treatment of calcium. The elastic elongation rate of this new silk fiber reached 69.5%, which is much higher than that of common silk (~1.3%). Meanwhile, it is soft with initial modulus of 9.8cN/dtex, while that of ordinary one is 72.4cN/dtex. In this paper, a four-parameter nonlinear visco-elastic model, was used to analyze the tensile properties of three-dimensional coil silk fibers. The theoretical prediction agrees well with experimental results. [ABSTRACT FROM AUTHOR] more...

The present work describes the fabrication of an amino hyperbranched polymer (AHP) functionalized mesoporous SiO2 nanocomposite based on cellulose biomass substrate through self-assembly method, obtaining a multi-functional hybrid composite (AM-cotton) as adsorbent for dye pollutions from aqueous medium. Specifically, polymer-functionalized mesoporous SiO2 nanoparticles (AMSNs) was obtained by covalently graft of AHP onto carboxyl-functionalized mesoporous silica nanoparticles (CMSNs) which were prepared via one-pot co-condensation. Subsequently, owing to electrostatic interaction between interfaces, AM-cotton fibers were fabricated via self-assembly of amino coated AMSNs on the surface of anion-modified cotton fiber (AN-cotton). Due to considerate versatile functional groups from hyperbranched polymer on nano-sized mesoporous silica with large surface area per unit mass, the functional fiber AM-cotton exhibits excellent adsorption capabilities for anionic (Congo red, CR) and cationic (Methylene blue, MB) dye pollutant with maximum of 195 mg/g for CR and 144 mg/g for MB, respectively. [ABSTRACT FROM AUTHOR] more...

Here, water-soluble hydroxyl-terminated hyperbranched poly(amino ester) (HBPAE)-capped titanium dioxide nanocrystals (TiO2 NCs) were synthesized for coating a cotton fabric via an amino-terminated hyperbranched poly(amidoamine) (HBPAA)-mediated self-assembly strategy in order to produce a controllable and uniform TiO2 coating on the cotton surface. As-prepared TiO2 NCs were characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and X-ray diffraction (XRD). It was demonstrated that hydroxyl-modified TiO2 NCs were egg-shaped and had a narrow size distribution. A TiO2 NC-coated cotton fabric was prepared by sequential impregnation with solutions of HBPAAs and TiO2 NCs. The attachment of HBPAAs to TiO2 NCs was evaluated by FTIR. It was shown that HBPAAs were chemically bound to the cotton surface. FESEM and XRD characterizations demonstrated that TiO2 NCs could self-assemble on a cotton fabric efficiently and were distributed uniformly on the cotton surface. [ABSTRACT FROM AUTHOR] more...

The aim of the present work is to investigate the potential of amino terminated hyperbranched polymer (HBP) modified mesoporous silica SBA-15 (HBP-SBA) as adsorbent for the removal of cationic and anionic dyes from aqueous media. The HBP-SBA adsorbent can be facilely synthesized through two steps: carboxyl functionalization of SBA-15 (obtaining CA-SBA) via one-pot co-condensation, and further graft of HBP onto CA-SBA. As an intermediate, CA-SBA contains abundant carboxyl groups with an uniform distribution, which not only form efficiently the chemical bond with amino group by grafting HBP, but also contribute to adsorption by providing active adsorption sites. The results demonstrate HBP-SBA adsorbent that contains nanonetwork with substantial adsorption sites is successfully fabricated, showing high adsorption capacity and quick adsorption rate for dyes. Compared with SBA-15 and CA-SBA, HBP-SBA gets better adsorption property, and the maximum adsorption capacities are 399.5 mg/g for cationic dye and 609.7 mg/g for anionic dye, respectively. [ABSTRACT FROM AUTHOR] more...

Ice-bath self-assembly was employed to fabricate the GO/AP-MCC/CS aerogel based on natural materials. The components are amphiprotic microcrystalline cellulose (AP-MCC), chitosan (CS), and graphene oxide (GO), which act as the main framework, auxiliary framework and adhesive, respectively. The results of characterization determines the components form the GO/AP-MCC/CS aerogel according to chemical interactions. The mechanical properties depend largely on the mass ratio of AP-MCC/CS, which can be regulated by controlling the contents of AP-MCC and CS. The resultant GO/AP-MCC/CS aerogel was observed possessing three-dimensional (3D) interpenetrating porous networks with wrinkled structure on the inner wall, which provide a good encapsulation capacity for the guest molecules. As expected, owing to the amphiprotic properties and large specific surface area, GO/AP-MCC/CS aerogel exhibits high-efficiency load capacity for both anionic (CR) and cationic azo molecules (MB), which can reach up to about 132.2 mg/g for CR and 123.2 mg/g for MB, respectively. [ABSTRACT FROM AUTHOR] more...

Graphene oxide-based composite (SSGO) with orderly pores was prepared by freeze-drying method. Its chemical structure, morphology and mechanical property were investigated. The results show that it has a unidirectional microporous structure which facilitates the diffusion of dyes. The incorporation of GO significantly improves the porous structure, and increases the compressive strength of SSGO. A 26.6 kPa increase and a 3 kPa improvement of strength in dry and wet states were achieved when 4 wt % GO was added. Moreover, the equilibrated adsorption capacity for methylene blue (MB) increased about 78.9%, up to 161 mg/g. With superior compressive strength and excellent adsorption capacity, the SSGO has promising recyclable application in dyes removal from wastewater. [ABSTRACT FROM AUTHOR] more...

This paper describes a strategy of fabricating silver nanoparticles (Ag NPs) finished cotton fabric through in situ synthesis method. In order to endow the cotton fabric with the capability of in situ synthesis of Ag NPs without any other reagents, an amino-terminated hyperbranched polymer (HBP-NH2) was employed to functionalize the cotton fabric. To this end, cotton fabric was oxidized to generate aldehyde groups and then HBP-NH2 was grafted on the oxidized cotton fabric based on the reaction between amino groups and aldehyde groups. Due to numerous imino and amino groups in the polymer and its special three-dimensional structure, the functional cotton fabric could take initiative to capture and reduce silver ions, control the formation of Ag NPs and fix them on the cotton fabric. The sizes of Ag NPs in situ synthesized on cotton fibers range from 4 to 10 nm. The prepared Ag NPs finished cotton fabric has excellent laundering durability. [ABSTRACT FROM AUTHOR] more...

A one-step simple synthesis of ZnO colloid nanoparticles was presented in this research. In the synthesis, ZnO nanoparticles colloidal solution was prepared by mixing Zn(NO3)<subscript>2 and self-made hyperbranched polymer (HSDA) aqueous solution under hydrothermal condition. According to the results of transmission electron microscope (TEM), UV–visible absorption spectroscopy (UV–vis spectra), and X-ray diffraction (XRD), ZnO nanoparticles had been formed in colloidal solution. The antibacterial test results showed that the ZnO colloid nanoparticles, prepared with 0.74 g/L Zn(NO3)2 aqueous solution in the presences of 2 g/L HSDA, had good antibacterial activities against Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus aureus), and even a very low concentration (as low as 5.0 µg/mL) of ZnO nanoparticles showed excellent antibacterial performance. [ABSTRACT FROM AUTHOR] more...