The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform

Yi Guo - One of the best experts on this subject based on the ideXlab platform.

  • Smart pH response flexible sensor based on calcium Alginate Fibers incorporated with natural dye for wound healing monitoring
    Cellulose, 2020
    Co-Authors: Li Cui, Wei Wang, Chao Yan, Yi Guo
    Abstract:

    A kind of smart calcium Alginate Fiber having pH indicating properties was proposed to monitor wound healing. The smart calcium Alginate Fiber was prepared by dyeing the hydroxypropyl trimethyl ammonium chloride chitosan (HACC) modified calcium Alginate Fiber with alizarin dye and anthocyanin dye, respectively. It was worth noting that modification of calcium Alginate Fibers with HACC enhanced the dyeing and antibacterial properties, simultaneously. When the concentration of HACC was 10 g/L, the modified calcium Alginate Fiber had the best dyeing performance. At the same time, the dyeing process had no significant influence on the mechanical properties of the Fibers with the strength loss only around 0.2 cN/dtex. The smart calcium Alginate Fibers exhibited a rapid and significant color change and reversible color response at pH 2–11. Moreover, the color change could be easily observed by naked eye. Therefore, the prepared calcium Alginate Fibers could be a good candidate for intelligent wound dressings for visual monitoring of wound healing.

Zhu Ping - One of the best experts on this subject based on the ideXlab platform.

  • Modification of calcium Alginate Fibers with aluminum sulfate solution
    Journal of Functional Biomaterials, 2012
    Co-Authors: Zhu Ping
    Abstract:

    Calcium Alginate Fibers(CAF) were immersed into aluminum sulfate aqueous solution in order to improve salt resistance and dyeing properties of CAF.The optimum conditions for modification of CAF were as following: concentration of aluminum sulfate was 15wt%,reaction temperature was 45℃ and reaction time was 40min.Under these conditions,the breaking strength of modified calcium Alginate Fiber(MCAF) was 2.94cN/dtex which was 11% higher than that of CAF.The structure of both CAF and MCAF was characterized by FT-IR and XRD.During modification process,carboxyl groups react with hydroxyl groups involved in calcium Alginates Fibers' macromolecular structure to form ester compounds.Meanwhile,aluminum ions in the solution exchange with sodium ions contained in calcium Alginate Fibers' macromolecular structure to form a three dimensional network configuration with Alginate macromolecular which was different from the "egg-box" structure of the compound containing calcium ions and Alginate macromolecular.The results of XRD show that crystal structure of MCAF was changed and crystallinity of MCAF has increased with the comparision of unmodified calcium Alginate Fibers.However,crystallinity of MCAF slightly decreases with the increase of temperature and concentration of aluminum sulfate aqueous solution.The water absorbability of MCAF decreases compare with CAF,especially for solution A that was used to imitate the wound exudates.The water absorbability of CAF was 13.1 in solution A,but that of MCAF declines to 1.28.However,the water absorbability of MCAF was still much better than that of cotton Fibers.The K/S value of dyed MCAF was about 4.5,which was 37.5 times higher than that of dyed CAF.Moreover,the color fastness to washing of dyed MCAF was above grade 4.

  • Dyeing thermodynamics of Alginate Fiber modified with PAMAM
    2011
    Co-Authors: Zhu Ping
    Abstract:

    Salt-free dyeing of PAMAM modified calcium Alginate Fiber is carried out with C.I.Direct Blue 15.Dyeing thermodynamics is studied,including dye uptake,the adsorption isotherm of the Fibers,dyeing affinity,heat and entropy.Compared with Alginate calcium Fibers,the dyeing behaviors of PAMAM modified calcium Alginate Fiber are much better,and the improving level is in direct proportion to the content of PAMAM in the Fiber.Adsorption isotherm for C.I.Direct Blue 15 on PAMAM modified calcium Alginate Fiber is a Nernst-type.The slope of adsorption isotherm and dyeing affinity increase along with the increase in dyeing temperature.Dyeing process is an exothermic reaction which increases the disorders of the dyeing system.Absolute value of dyeing heat and dyeing affinity increase with the increase in the content of PAMAM in the Fiber.

  • Properties of Cu~(2+) modified calcium Alginate Fiber
    Textile Auxiliaries, 2011
    Co-Authors: Zhu Ping
    Abstract:

    Cu2+ modified calcium Alginate Fibers were prepared by soaking the calcium Alginate Fibers in copper sulfate solution.The properties of the modified calcium Alginate Fiber were tested,such as infrared spectra,physical mechanical properties,salt resistance,hydroscopicity,antibacterial property,thermal decomposition property and the limiting oxygen index(LOI).The breaking strength of modified calcium Alginate Fibers was 3.28 cN/dtex,which increased by 25% than unmodified calcium Alginate Fiber.The salt resistance of Cu2+ modified calcium Alginate Fibers was improved,and no gelatinization happened when the Fibers were soaked in common salt solution.However,damage still occurred and lead to the decrease of breaking strength of Fibers,hydroscopicity and flame resistance.While the antibacterial effects of modified Fibers to S.aureus and E.coli were distinct and durable.

  • Research on the properties of Alginate Fiber with high strength
    Textile Auxiliaries, 2009
    Co-Authors: Zhu Ping
    Abstract:

    The present Alginate Fiber had poor strength, which limited its application filed. The properties of the Fiber were studied such as the morphological structure, crystallinity, physical mechanical properties, moisture property, thermal property, flaming retardance. The Alginate Fibers are uniform in the diameters and have grooves on the surface, whose cross section is irregular sawtooth and has no thicker skin layer, which is similar with the general viscose Fiber. The crystalline index of this Fiber is 0.28, the breaking strength is 3.63 cN/dtex, which are better than cotton and viscose Fiber, the moisture property is excellent. The mechanism of self flame-resisting were analyzed theoretically.

  • Identification of Alginate Fiber
    2008
    Co-Authors: Zhu Ping
    Abstract:

    Macromolecular structures of Alginate Fiber were introduced,various testing methods were applied to research the characteristics of the Fiber,such as combustion method,microscope method,infrared absorption spectrum,as well as solvent dissolve method.An accurate and simple method was provided to distinguish Alginate Fiber from other Fibers.

Ping Zhu - One of the best experts on this subject based on the ideXlab platform.

  • Blending Alginate Fibers with polyester Fibers for flame-retardant filling materials: Thermal decomposition behaviors and fire performance
    Polymer Degradation and Stability, 2021
    Co-Authors: Qian-zhan Wang, Yan-yan Liu, Bin Wang, Yun Liu, Ping Zhu
    Abstract:

    Abstract Polyester Fibers are often applied as filling materials; however, they are flammable and exhibit melt-dripping. In this work, to prepare Fibers with high flame retardancy, inherently flame-retardant Alginate Fibers were blended with polyester Fibers, without using any toxic chemicals. The blended Fibers with 20 wt.% Alginate Fibers achieved quick self-extinguishing without any melt-dripping in the vertical flame test and a test according to Pennsylvania Stuffed Toy Regulations. During the cone calorimetry test, the blended materials with 50 wt.% Alginate Fibers showed a remarkable decrease in heat and smoke release, compared with the blend with 20 wt.% Alginate Fiber and polyester Fibers. Moreover, the Alginate Fibers could decompose prematurely and then delay the weight loss of polyester components when the natural/synthetic blends were subjected to heating. Also, they exhibited flame-retardant activities both in the vapor phase by the fuel dilution of non-flammable gases and in the condensed phase by forming calcium-enriched residues that were incompatible with polyester melts. Given their ease of preparation and high flame retardancy, the blended Fibers have the potential for applications as filling materials of children's toys, furniture, and clothing.

  • Characterization and functional assessment of Alginate Fibers prepared by metal-calcium ion complex coagulation bath
    Carbohydrate polymers, 2019
    Co-Authors: Qianqian Wang, Lin Zhang, Yan-yan Liu, Gangqiang Zhang, Ping Zhu
    Abstract:

    Abstract In order to improve the mechanical properties of Alginate Fiber and enrich its application properties, the metal-Alginate Fibers were produced with wet spinning in the coagulation bath of Zn2+, Ba2+, Cu2+, Al3+ ions blended with Ca2+ ions. FT-IR and 13C NMR were used to characterize the binding mode of alginic acid with metal ions and the arrangement of G and M groups in the molecular chain. The flame retardancy, mechanical and antibacterial properties of metal-Alginate Fiber were improved, while its water absorption was decreased. The results of Thermogravimetric (TG) and Limiting oxygen index (LOI) showed that the flame retardancy of metal-Alginate Fibers was better than that of calcium Alginate Fibers. The combination of metal ions and alginic acid has different improvement effect of mechanical strength and antimicrobial activity against Escherichia coli and Staphylococcus aureus. The multi-functional Fiber is expected to be used in medical textiles and new textile Fibers.

  • Preparation, Structure and Properties of High Strength Alginate Fiber
    Research Journal of Textile and Apparel, 2009
    Co-Authors: Ping Zhu, Chuanjie Zhang, Shuying Sui, Huaifang Wang
    Abstract:

    Alginate Fiber with a breaking tenacity of up to 2.32 cN/dtex is prepared by spinning a sodium Alginate solution in a coagulating solution of CaCl2 aqueous solution followed by multi-roller drawing. Preparation parameters such as sodium Alginate concentration, coagulant concentration and coagulation temperature, which affect the Fiber tenacity, are investigated with an orthogonal test design, and the best spinning process is found with a coagulating 5% sodium Alginate solution in 4% CaCl2 at 40°C. The morphology, degree of crystallinity, thermal stability and the combustion performance of this Alginate Fiber are investigated by scanning electron microscopy (SEM), infrared (IR), X-ray diffraction (XRD), Thermo gravimetric Analysis (TGA) and Cone Calorimeter. Using the centrifugal dewatering method, the absorption capacity of this Alginate Fiber is determined, and has a capacity of 13.01 grams of man-made blood per gram. The test results show that Fibers have an irregular cross-section without a thicker cortex and uniform longitudinal surface with grooves. The combustion property results demonstrate that the Fiber has a self-flameretarding property.

Xia Yan-zhi - One of the best experts on this subject based on the ideXlab platform.

  • Antibacterial Property of Zinc Alginate Fiber
    2010
    Co-Authors: Wu Da-wei, Han Guang-ting, Wu Yan, Gong Ying, Zhang Yuan-ming, Xia Yan-zhi
    Abstract:

    To improve the antibacterial property of Alginate Fiber, zinc Alginate Fiber was prepared by using Zn(2+) to replace Ca(2+) in coagulating bath, expecting to widen the application of Alginate Fiber in the medical dressings. The antibacterial properties and mechanism of zinc Alginate Fibers were investigated. The inhibitory rate was tested using the Petri-dish count method and 3-(4, 5-Dimethylthiazol-2- yl)-2, 5- diphenyltetrazolium bromide (MTT) method by the way of shake-flash. The results show that calcium Alginate Fiber has weaker bacteriostasis, while zinc Alginate Fiber has obvious inhibitive effect. The scanning electron microscopy (SEM) images show that the cell has ruptured and the surface of bacteria is scraggly after the interactions between bacteria and Fibers. The excellent antibacterial property of zinc Alginate Fiber demonstrates its potential application in wound treatments, especially in easily-infected wound.

  • Preliminary Study on the Softeness Mechanism Model of Alginate Fiber
    Synthetic Fiber in China, 2010
    Co-Authors: Xia Yan-zhi
    Abstract:

    The softener self-made at laborotary is used to treat the Alginate Fiber.The FT-IR,SEM,XPS and TEM are applied to analyze the treatmented samples,and the functional groups,surface morphology of the surface of substrates,the penetration of softener molecules and the demulsification of softener microemulsion are obtained.The results show that softener molecules escape from micelle and adsorb on the surface of the Alginate Fiber regularly forming the smooth film,softener molecules penetrate into the Alginate Fiber and endow the Alginate Fiber with the softness.

  • Preparation and properties of barium Alginate Fiber
    Journal of Functional Biomaterials, 2009
    Co-Authors: Xia Yan-zhi
    Abstract:

    Barium Alginate Fibers were prepared through wet-spinning of Alginate sodium into coagulationg bath containing 0.5mol/L barium chloride.The composition and morphology of barium Alginate Fibers were investigated with FT-IR and SEM.The mechnical property and anti-radiation property of barium algiante were analysized.It revealed that the average tensile strength of the barium algiante Fiber was 20.69cN/tex and the line density was 3.86dtex.Barium Alginate Fiber has good anti-radiation property compared with viscose Fibers.

Yanzhi Xia - One of the best experts on this subject based on the ideXlab platform.

  • Coloration of Calcium Alginate Fiber with Dye and Auxiliary Derived from Polyvinylamine (PVAm). I. Complex Dyeing with Polymeric Dyes Containing PVAm
    Fibers and Polymers, 2021
    Co-Authors: Li Zhaoyi, Yanzhi Xia, Sun Liang, Fu Zhongjun, Li Yuchao, Jiang Zhaohui, Bingtao Tang, Wang Ming, Haofei Huang
    Abstract:

    Calcium Alginate Fiber is a biomaterial with promising application in textile industry. However, the poor dyeing property of this Fiber restricts its development. In this study, three PVAm (polyvinylamine) dyes were applied to the exhaust dyeing of calcium Alginate Fiber and their dyeing behavior under different dyeing conditions was studied. The dyeing results revealed that PVAm dyes were firmly adsorbed on calcium Alginate Fiber by coordination bonding formed between the primary amino groups in PVAm backbones of dyes and Ca2+ ions in calcium Alginate Fiber. This special complex dyeing mode was further confirmed by a Langmuir-type adsorption manner of PVAm-1 dye for calcium Alginate Fiber. By the formation of this stable chelation structure between dyes and Fibers, high exhaustion rates (88.9–97.1 %) and excellent color fastness were obtained. SEM and XRD results also showed that the surface and crystal phase of dyed Fibers had very slight changes compared to those of original calcium Alginate Fibers. The strength property of the Fiber was also maintained well after this special complex dyeing process.

  • efficient suppression of flammability in flame retardant viscose Fiber through incorporating with Alginate Fiber
    Materials Letters, 2018
    Co-Authors: Xiansheng Zhang, Yanzhi Xia, Xiong Yan, Meiwu Shi
    Abstract:

    Abstract The flame retardancy of flame retardant viscose (FRV) Fiber can be significantly further improved by simple blending with Alginate (A) Fiber, even though with the content of 10 wt%. Cone calorimeter results showed that longer time to ignition (TTI), lower peak heat release rate (PHRR) and total heat release (THR) can be achieved in FRV after mixing with A. For example, the TTI of FRV can be raised from 10 s to 41 s after blended with only 10 wt% A. The mechanism of the effective suppression of flammability mentioned above was put forward by thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR) and pyrolysis-gas chromatography–mass spectrometry (Py-GC–MS). It was found that the content of released CO2 for FRV/A was higher than that of pure FRV, and the content of the flammable gases for FRV/A, such as hydrocarbons, aldehydes, ethers and alcohols, was lower than that of FRV. In this way, the flame retardancy of FRV was effectively enhanced after blending with A.

  • Influence of Calcium Ion on Thermal Degradation and Flame Retardance Behaviour of Alginate Fiber
    Advanced Materials Research, 2013
    Co-Authors: Guang Xiu Tian, Fengyu Quan, Yanzhi Xia
    Abstract:

    Experimental research on calcium Alginate Fibers thermal degradation and flame retardancy under catalysis of metallic salts was done by limiting oxygen index (LOI), scanning electron microscopy (SEM), and thermogravimetric analysis (TG) methods. LOI results show that with increasing calcium ions content, the flame retardant properties of the calcium Alginate Fibers improves further. The residues of calcium Alginate Fibers gradually retained Fiber shape and on the surface of the residues the holes reduced, with the calcium ion content increasing. TG indicates temperature at maximum rate of weight loss (T-max) was clearly shifted from 246 °C for alginic acid Fibers to 244°C, 236°C, 208°C, 205 °C and 203°C (SCa-1-1# calcium Alginate Fibers, SCa-2-2# calcium Alginate Fibers, SCa-3-3# calcium Alginate Fibers, SCa-4-4# calcium Alginate Fibers, SCa-5-5# calcium Alginate Fibers), respectively. The thermal degradation residues at 1000°C for different calcium Alginate Fibers are 13.7%, 16.1%, 17.2%, 18.2%, 18.4%, 19.2%, separately. Further discussion of the combustion process and flame retardant mechanism is presented.

  • Preparation of nanostructured porous carbon composite Fibers from ferrum Alginate Fibers
    Journal of Applied Polymer Science, 2012
    Co-Authors: Bingbing Wang, Qingshan Kong, Fengyu Quan, Yanzhi Xia
    Abstract:

    Nano-microstructured porous carbon composite Fibers (Fe2O3@C/FeO@C/Fe@C) were synthesized by the thermal decomposition of ferrum Alginate Fibers. The ferrum Alginate Fiber precursors were prepared by wet spinning, and calcined at 300–1000°C in high purity nitrogen. The resulting composite Fibers consist of carbon coated Fe2O3/FeO/Fe nanoparticles and porous carbon Fibers. All the prepared nanostructures were investigated using thermal gravimetry, X-ray diffraction (XRD), Fourier transform infrared spectroscopy, transmission electron microscope (TEM), and nitrogen adsorption–desorption isotherm. The results show that there are five stages in the decomposition process of the ferrum Alginate Fibers. Transitions between the five stages are affected by the decomposition temperature. XRD results show that maghemite (Fe2O3), wustite (FeO), martensite (Fe) nanoparticles were formed at 300–500°C, 600–700°C, 800–1000°C, respectively. Scanning electron microscopy and TEM results indicate that the composite Fibers consist of nanoparticles and porous carbon. The diameter of the nanosized particles increased from 100 to 500 nm with increasing reaction temperature. The nitrogen adsorption–desorption results also show that the composite Fibers have a micro- and mesoporous structure. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

  • Immunotoxicity of Copper Alginate Fibers in Guinea Pigs and Mice
    Biological Trace Element Research, 2011
    Co-Authors: Ying Gong, Guang Ting Han, Yuanming Zhang, Ying Pan, Wei Jiang, Yanzhi Xia
    Abstract:

    The relation between copper Alginate Fibers and immunotoxicity in animals was studied by dividing guinea pigs and mice into control groups and experimental groups. Varied weights of Fibers were subcutaneously embedded in the experimental groups, whereas the control groups were operated on simulatively. Morphology analysis, erythrocyte osmotic fragility (EOF) test, direct plaque-forming cell (PFC) assay, quantitative hemolysis spectrophotometry (QHS) assay, macrophages phagocytosis assay, and pathology analysis were used to examine morphology, microstructure, and immunotoxicity. With increasing doses of copper Alginate Fibers, the EOF of experimental groups increased in contrast with the control group. Moreover, the antibody level decreased based on the results of the PFC and QHS assays, and macrophages phagocytosis descended in relation to dose. However, the immune functions were weakened without time dependence. According to pathologic photographs, the partial organs were damaged, implying bad histocompatibility. Hence, copper Alginate Fiber is proved to be a harmful material for medical devices.