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Hao L.,Qingdao University | Hao L.,Collaborative Innovation Center for Marine Biomass Fibers | Hao L.,Sunvim Group Co. | Wang R.,Qingdao University | And 5 more authors.
Cellulose | Year: 2016

First, a crude cellulase was used to treat cotton fabrics to investigate its influences on the physicochemical properties of cotton. The FTIR and XRD analyses both confirmed the enzymatic treatment could increase the crystallinity of cotton, especially at a higher cellulase dosage. Once treated, the number of dissociable groups (–COOH) in cotton decreased, while that of the reducing groups (–CHO) increased. Second, copper phthalocyanine (CuPc) was selected to prepare an anionic nanoscale pigment dispersion to detect its dyeability on different cotton samples. It was concluded that the enzymatic hydrolysis itself had no significant impacts on the pigment dyeing performance. However, cellulase protein still stayed on the cotton surface after treatment and produced an enhancement effect on the pigment uptake due to strong hydrophobic interactions between them. This could be verified by K/S measurement and SEM observations. © 2015, Springer Science+Business Media Dordrecht.


Hao L.,Qingdao University | Hao L.,Collaborative Innovation Center for Marine Biomass Fibers | Hao L.,Sunvim Group Co. | Wang R.,Qingdao University | And 5 more authors.
Carbohydrate Polymers | Year: 2015

In this research, titanium dioxide (TiO2) nano-fibers with a well-organized anatase structure were synthesized by a hydrothermal method. Their structural properties were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and transmission electron microscope (TEM) analysis, respectively. Subsequently, the TiO2 nano-fibers were optically excited under the ultraviolet (UV) irradiation to decolorize the reactive dye solution. The influences of initial pH, concentrations of reactive dye and TiO2 nano-fibers as well as irradiation time on rate of photocatalytic decolorization were investigated. Based on their excellent photocatalytic performance, a novel method for achieving the synchronized wash-off of reactive-dyed cotton and decolorization of resultant wastewater was developed. It was found that the wash fastness of reactive-dyed cotton after TiO2-based wash-off was equal to that after standard way. The influences of TiO2-based wash-off on the properties of cotton substrates were determined by Fourier transform infrared spectroscopy (FTIR), XRD, and scanning electron microscope (SEM) analysis, respectively, which indicated that this new synchronized method would exert few damages to the cotton substrate. © 2015 Elsevier Ltd.


Wang J.,CAS Qingdao Institute of Oceanology | Wang J.,Chinese Academy of Sciences | Wang J.,Collaborative Innovation Center for Marine Biomass Fibers | Liu H.,Nantong University | And 5 more authors.
Marine Drugs | Year: 2014

Diabetic nephropathy (DN) has long been recognized as the leading cause of end-stage renal disease, but the efficacy of available strategies for the prevention of DN remains poor. The aim of this study was to investigate the possible beneficial effects of fucoidan (FPS) in streptozotocin (STZ)-induced diabetes in rats. Wistar rats were made diabetic by injection of STZ after removal of the right kidney. FPS was administered to these diabetic rats for 10 weeks. Body weight, physical activity, renal function, and renal morphometry were measured after 10 weeks of treatment. In the FPS-treated group, the levels of blood glucose, BUN, Ccr and Ucr decreased significantly, and microalbumin, serum insulin and the β2-MG content increased significantly. Moreover, the FPS-treated group showed improvements in renal morphometry. In summary, FPS can ameliorate the metabolic abnormalities of diabetic rats and delay the progression of diabetic renal complications. © 2014 by the authors licensee MDPI.


Liu L.,Collaborative Innovation Center for Marine Biomass Fibers | Liu W.,Qingdao University | Zhao X.,Collaborative Innovation Center for Marine Biomass Fibers | Chen D.,University of Science and Technology of China | And 5 more authors.
ACS Applied Materials and Interfaces | Year: 2014

Radioactive iodine isotopes that are produced in nuclear power plants and used in medical research institutes could be a serious threat to the health of many people if accidentally released to the environment because the thyroid gland can absorb and concentrate them from a liquid. For this reason, uptake of iodide anions was investigated on microrosette-like δBi2O3 (MR-δ-Bi2O3). The MR-δ-Bi2O3 adsorbent showed a very high uptake capacity of 1.44 mmol g-1 by forming insoluble Bi4I2O5 phase. The MR-δ-Bi2O3 also displayed fast uptake kinetics and could be easily separated from a liquid after use because of its novel morphology. In addition, the adsorbent showed excellent selectivity for I- anions in the presence of large concentrations of competitive anions such as Cl- and CO3 2-, and could work in a wide pH range of 4-11. This study led to a new and highly efficient Bi-based adsorbent for iodide capture from solutions. © 2014 American Chemical Society.


Liu S.,Qingdao University | Liu S.-L.,Qingdao University | Long Y.-Z.,Qingdao University | Long Y.-Z.,Key Laboratory of Photonics Materials and Technology in Universities of Shandong | And 9 more authors.
Applied Physics Letters | Year: 2014

Ce-doped p-type ZnO nanofibers were synthesized by electrospinning and followed calcinations. The surface morphology, elementary composition, and crystal structure of the nanofibers were investigated. The field effect curve confirms that the resultant Ce-doped ZnO nanofibers are p-type semiconductor. A p-n heterojunction device consisting of Ce-doped p-type ZnO nanofibers and n-type indium tin oxide (ITO) thin film was fabricated on a piece of quartz substrate. The current-voltage (I-V) characteristic of the p-n heterojunction device shows typical rectifying diode behavior. The turn-on voltage appears at about 7 V under the forward bias and the reverse current is impassable. © 2014 AIP Publishing LLC.


Li J.,Collaborative Innovation Center for Marine Biomass Fibers | Yang D.,Collaborative Innovation Center for Marine Biomass Fibers | Zhu X.,Collaborative Innovation Center for Marine Biomass Fibers | Wang L.,Collaborative Innovation Center for Marine Biomass Fibers | And 2 more authors.
Science of Advanced Materials | Year: 2015

This paper reports the successful facile synthesis and characterization of Sn-doped TiO2(B) nanotubes by heat treatment of Sn2+-doped protonated titanate nanotubes (H2T3O7 NTs) under argon atmosphere. The prepared nanotubes were examined in detail in terms of their structural and morphological properties using various techniques such as X-ray diffraction; scanning electron microscopy and transmission electron microscopy. The detailed characterizations revealed that the prepared materials are nanotubes which are grown in very high density and possessing monoclinic structure. Further, the prepared nanotubes were used as anode material for the fabrication of efficient lithium ion battery. Interestingly, it was observed that, as anode materials for lithium-ion batteries, the prepared Sn-doped TiO2(B) nanotubes (TiO2(B) NTs) exhibited a capacity of 241.6 mAh g-1 after 100 discharge/charge cycles at 0.1 C, and retain 115.9 mAh g-1 after 10 cycles at 2 C. Apparently, the Sn2+ doping is improving the electrical conductivity and interface between electrode and electrolyte, which is highly useful to shorten Li+ transmission distance. The presented work demonstrates that Sn-doped TiO2(B) nanotubes might present themselves as a promising negative electrode material for the fabrication of efficient lithium-ion batteries. © 2015 by American Scientific Publishers.


Zhang S.,Qingdao University | Yang D.,Collaborative Innovation Center for Marine Biomass Fibers | Jing D.,Energy and Environmental Research Center | Liu H.,University of Sydney | And 5 more authors.
Nano Research | Year: 2014

Photodynamic therapy (PDT), which is a procedure that uses photosensitizing drug to apply therapy selectively to target sites, has been proven to be a safe treatment for cancers and conditions that may develop into cancers. Nano-sized TiO2 has been regarded as potential photosensitizer for UV light driven PDT. In this study, four types of TiO2 nanofibers were prepared from proton tri-titanate (H2T3O7) nanofiber. The as-obtained nanofibers were demonstrated as efficient photosensitizers for PDT killing of HeLa cells. MTT assay and flow cytometry (FCM) were carried out to evaluate the biocompatibility, percentage of apoptotic cells, and cell viability. The non-cytotoxicity of the as-prepared TiO2 nanofibers in the absence of UV irradiation has also been demonstrated. Under UV light irradiation, the TiO2 nanofibers, particularly the mixed phase nanofibers, displayed much higher cell-killing efficiency than Pirarubicin (THP), which is a common drug to induce the apoptosis of HeLa cells. We ascribe the high cellkilling efficiency of the mixed phase nanofibers to the bandgap edge match and stable interface between TiO2(B) and anatase phases in a single nanofiber, which can inhibit the recombination of the photogenerated electrons and holes. This promotes the charge separation and transfer processes and can produce more reactive oxygen species (ROS) that are responsible for the killing of HeLa cells.[Figure not available: see fulltext.]. © 2014, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.


Hao L.,Qingdao University | Hao L.,Collaborative Innovation Center for Marine Biomass Fibers | Hao L.,Sunvim Group Co. | Wang R.,Qingdao University | And 4 more authors.
Advanced Powder Technology | Year: 2016

In this research, a novel nano-pigment suspension was successfully prepared in an ultrasonic disruptor using crude cellulase as dispersant. The colloidal and rheological properties of this cellulase-based suspension such as zeta potentials, particle distribution and apparent viscosity were analyzed. The measurement of zeta potentials showed that the surface charges of pigment were adjustable along with the acid-base properties of external environment due to the amphoteric character of cellulase proteins. Subsequently, its stability to high-speed centrifuge, freeze-thaw treatment and ion intensity was carefully investigated. Thermo-gravimetric analysis (TGA) was conducted to demonstrate the coverage of pigment particles by cellulase proteins. Furthermore, X-ray diffraction (XRD) characterization was utilized to disclose the combined impacts of cellulase and ultrasonic power on the crystal structures of pigment. At last, the coloring performance of this charge-adjustable nano-pigment suspension on cotton substrates was evaluated by measuring their K/S values and color fastness. Scanning Electron Microscope (SEM) was carried out to give a direct observation of the nano-pigment distributed on cotton surfaces. © 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.


Zhang S.,Qingdao University | Yang D.,Collaborative Innovation Center for Marine Biomass Fibers | Jing D.,Xi'an Jiaotong University | Liu H.,University of Sydney | And 5 more authors.
Nano Research | Year: 2014

Photodynamic therapy (PDT), which is a procedure that uses photosensitizing drug to apply therapy selectively to target sites, has been proven to be a safe treatment for cancers and conditions that may develop into cancers. Nano-sized TiO2 has been regarded as potential photosensitizer for UV light driven PDT. In this study, four types of TiO2 nanofibers were prepared from proton tri-titanate (H2T3O7) nanofiber. The as-obtained nanofibers were demonstrated as efficient photosensitizers for PDT killing of HeLa cells. MTT assay and flow cytometry (FCM) were carried out to evaluate the biocompatibility, percentage of apoptotic cells, and cell viability. The non-cytotoxicity of the as-prepared TiO2 nanofibers in the absence of UV irradiation has also been demonstrated. Under UV light irradiation, the TiO2 nanofibers, particularly the mixed phase nanofibers, displayed much higher cell-killing efficiency than Pirarubicin (THP), which is a common drug to induce the apoptosis of HeLa cells. We ascribe the high cellkilling efficiency of the mixed phase nanofibers to the bandgap edge match and stable interface between TiO2(B) and anatase phases in a single nanofiber, which can inhibit the recombination of the photogenerated electrons and holes. This promotes the charge separation and transfer processes and can produce more reactive oxygen species (ROS) that are responsible for the killing of HeLa cells.[Figure not available: see fulltext.] © 2014 Tsinghua University Press and Springer-Verlag Berlin Heidelberg.


Lin D.-P.,Qingdao University | He H.-W.,Qingdao University | Huang Y.-Y.,Qingdao University | Han W.-P.,Qingdao University | And 5 more authors.
Journal of Materials Chemistry C | Year: 2014

We report an effective method to fabricate poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)-polyvinyl pyrrolidone (PEDOT:PSS-PVP) fiber arrays doped with ionic liquid (IL). The twisted microropes were obtained by twisting the electrospun aligned polymer fiber arrays. It was found that the twisted rope exhibited higher electrical conductivity (∼1.8 × 10-4 S cm-1) after IL doping (1.96 wt%) than those without doping (∼0.8 × 10-5 S cm-1), and its conductivity was linearly correlated with strain up to 35% (which is one magnitude larger than previous reports) and showed repeatable cycle loops of tensile-resilience. The extensible rate could reach up to more than 90%, considerably higher than that of ropes without IL doping (∼17%). The results indicate that the twisted PEDOT:PSS-PVP ropes may be used as elastic semiconductors and stretchable sensors. is © the Partner Organisations 2014.

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