Time filter

Source Type

Tianjin, China

Tianjin University of Science & Technology is a university in Tianjin, China under the municipal government. The original campus is in Hexi district. It is the first university to open a full-time campus in the Tianjin Economic-Technological Development Area and has the intention of moving the whole university to that campus. The university was formerly known as Tianjin Institute of Light Industry. Wikipedia.

Zhou X.-M.,Tianjin University of Science and Technology
Materials Science and Engineering C | Year: 2012

A series of polyester copolymers was synthesized from 1,4-succinic acid with 1,4-butanediol and poly(ethylene glycol) through a two-step process of esterification and polycondensation in this article. The composition and physical properties of copolyesters were investigated via GPC, 1HNMR, DSC and PLM. The copolymer composition was in good agreement with that expected from the feed composition of the reactants. The melting temperature (T m), crystallization temperature (T c), and crystallinity (X c) of these copolyesters decreased gradually as the content of PEG unit increased. Otherwise, experimental results also showed that the contents of PEG in copolymers had an effect on the molecular weight, distribution, thermal properties, hydrolysis degradation properties, and crystalline morphology of polyester copolymers. © 2012 Elsevier B.V.

Zhang S.,Tianjin University of Science and Technology
RSC Advances | Year: 2014

Nano-sized calcium hydroxide (Ca(OH)2) photocatalysts were synthesized by a precipitation method. The as-prepared Ca(OH)2 samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), UV-vis absorption spectroscopy and photoluminescence spectroscopy (PL). The as-obtained Ca(OH)2 samples showed excellent photocatalytic degradation activities against methylene blue (MB) aqueous solution under visible light radiation. Dependence of the activity on various experimental conditions was investigated, and the results suggested promising utilization of the Ca(OH)2 photocatalysts. In addition, the photocatalytic degradation of MB was well fitted to pseudo-first-order kinetics. Therefore, MB was photocatalytically degraded over Ca(OH)2 through indirect dye photosensitization. This journal is © the Partner Organisations 2014.

Wang S.,Tianjin University of Science and Technology | Copeland L.,University of Sydney
Food and Function | Year: 2013

Starch is the most important glycemic carbohydrate in foods. The relationship between the rate and extent of starch digestion to produce glucose for absorption into the bloodstream and risk factors for diet-related diseases is of considerable nutritional interest. Native starch is attacked slowly by enzymes, but after hydrothermal processing its susceptibility to enzymatic breakdown is greatly increased. Most starch consumed by humans has undergone some form of processing or cooking, which causes native starch granules to gelatinize, followed by retrogradation on cooling. The extent of gelatinization and retrogradation are major determinants of the susceptibility of starch to enzymatic digestion and its functional properties for food processing. The type and extent of changes that occur in starch as a result of gelatinization, pasting and retrogradation are determined by the type of the starch, processing and storage conditions. A mechanistic understanding of the molecular disassembly of starch granules during gelatinization is critical to explaining the effects of processing or cooking on starch digestibility. This review focuses on the molecular disassembly of starch granules during starch gelatinization over a wide range of water levels, and its consequential effect on in vitro starch digestibility and in vivo glycemic index. © 2013 The Royal Society of Chemistry.

Zhang S.,Tianjin University of Science and Technology
Ultrasonics Sonochemistry | Year: 2012

C and Cr co-doped TiO2 (C-Cr-TiO2) sonocatalyst were synthesized by doping TiO2 with glucose and CrCl3 in a sol-gel method. The samples were characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy, and X-ray photoelectron emission spectroscopy (XPS). C and Cr were detected by XPS analysis. The influence of dopants on the properties and sonocatalytic activity of TiO2 was studied. The sonodegradation products of methylene blue were analyzed by UV-vis absorption spectroscopy. The presence of C-Cr-TiO2 catalysts substantially enhanced the sonocatalytic degradation of MB in aqueous suspensions. The possible sonocatalytic mechanisms were also discussed. © 2011 Elsevier B.V. All rights reserved.

Zhang S.,Tianjin University of Science and Technology
Ceramics International | Year: 2014

ZnS microcrystals with various shapes, including polyhedron, fan-shaped sheet, hexagonal rectangle and missing angle rectangle, were successfully prepared using a simple hydrothermal method by changing the experimental conditions. The as-obtained ZnS samples were characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The photocatalytic activities of the ZnS microcrystals with different morphologies were investigated by degradation testing of methylene blue aqueous solution. The highest photodegradation rate of methylene blue over the polyhedron-shaped ZnS reached up to almost 100%. The photodegradation efficiencies under various conditions, including amount of catalyst, pH of aqueous solution and initial concentration of methylene blue, were studied in the presence of polyhedron-shaped ZnS. The polyhedron-shaped ZnS microcrystal can thus be utilized as a promising photocatalyst for photodegrading dyes in wastewater treatment. © 2013 Elsevier Ltd and Techna Group S.r.l.

Discover hidden collaborations