检索结果-南通市图书馆

Spectrofluorimetric determination of trace amounts of cadmium with 2,4-dihydroxyacetophenone benzoylhydrazone

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2006年第2期25卷 184-189页

作者： LIU jianning ZHANG Bing wu Bowan LIU Yongchun YU Xinqiao Department of Chemistry Longdong University Qingyang 745000 China

A new fluorescent reagent 2,4-dihydroxyacetophenone benzoylhydrazone （DHAPBH） was synthesized and its ionization constants were established spectrophotometrically. The fluorescent reaction of this reagent with cadmium was studied. The cadmium ion can form a stable binary chelate with DHAPBH, having a mole ratio of 1 ：2 in the pH range of 3.6-4.4. Based on this chelation reaction, a highly sensitive spectrofiuorimetric method was developed for determination of trace amounts of cadmium in a water-ethanol （7：3 in volume ratio） medium at pH = 4.0. Under these conditions, the Cd-DHAPBH complex has excitation and emission maxima at 306 and 437 nm, respectively. The linear range of the method is from 0.36 to 140μtg·L^-1 and the detection limit is 0.27 μtg·L^-1 of cadmium. Interferences of other ions were studied. The method was successfully applied to the determination of cadmium in mineral water, tap water, fiver water, and wastewater.

关键词： cadmium 2,4-dihydroxyacetophenone benzoylhydrazone spectrofiuorimetry determination

Novel robust cellulose-based foam with pH and light dual-response for oil recovery

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2018年第2期12卷 118-128页

作者： Qian WANG Guihua MENG jianning wu Yixi WANG Zhiyong LIU Xuhong GUO School of Chemistry and Chemical Engineering Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan Shihezi 832003 China State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

We fabricated pH and light dual-responsive adsorption materials which could induce the transition of surface wettability between hydrophobicity and hydrophilicity by using ATRPo The structure and morphology of adsorption materials were confirmed by ATR-FTIR, XPS, TGA and SEM. It showed that the modified cellulose （CE）- based foam was hydrophobic, which can adsorb a range of oils and organic solvents in water under pH = 7.0 or visible light irradiation （λ〉500 nm）. Meanwhile, the wettability of robust CE-based foam can convert hydrophobicity into hydrophilicity and underwater oleophobicity under pH = 3.0 or UV irradiation （λ = 365 nm）, giving rise to release oils and organic solvents. Most important of all, the adsorption and desorption processes of the modified CE-based foam could be switched by external stimuli. Furthermore, the modified CE-based foam was not damaged and still retained original performance after reversible cycle repeated for many times with variation of surface wettability. In short, it indicates that CE-based foam materials with switchable surface wettability are new responsive absorbent materials and have owned potential application in the treatment of oil recovery.

关键词： cellulose-based foam dual-responsive adsorption materials switchable wettability oil recovery

One-step synthesis and self-assembly behavior of thermo-responsive star-shaped β-cyclodextrin-（P（M EO2MA-co-PEGMA））21 copolymers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2017年第3期11卷 223-232页

作者： Lulu WEI Beibei LU Lei LI jianning wu Zhiyong LIU Xuhong GUO School of Chemistry and Chemical Engineering Shihezi University/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan Shihezi 832003 China State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

A novel β-cyclodextrin-poly（2-（2-methoxyethoxy）ethyl methacrylate）-co- poly（ethylene glycol） methacrylate （abbreviated as： β-CD-（P（MEO2MA-co-PEGMA））21） was prepared by using the one-step strategy, and then the star-shaped copolymers were used in the atom transfer radical polymerization （ATRP）. The structure of star-shaped β- CD-（P（MEO2MA-co-PEGMA））21 copolymers were studied by FTIR, 1H NMR and gel permeation chromatography （GPC）. The star-shaped copolymers could self-assembled into micelles in aqueous solution owing to the outer amphiphilic β-CD as a core and the hydrophilic P（MEO2MA-co-PEGMA） segments as a shell. These thermo-responsive starshaped copolymers micelles exhibited lower critical solution temperature （LCST） in water, which could be finely tuned by changing the feed ratio of MEO2MA to PEGMA. The LCST of star-shaped β-CD-（P（MEO2MA-co-PEGMA））21 copolymer micelles were increased from 35℃ to 58℃ with the increasing content of PEGMA. The results were investigated by DLS and TEM. When the temperature was higher than corresponding LCSTs, the micelles started to associate and form spherical nanoparticles. Therefore, β- CD-（P（MEO2MA-co-PEGMA））21 star-shaped copolymer micelles could be potentially applied in nano-carrier, nano-reactor, smart materials and biomedical fields.

关键词： star-shaped copolymers thermo-responsive β-cyclodextrin (β-CD) self- assembly atom transfer radical polymerization (ATRP)

Environmentally benign chitosan as reductant and supporter for synthesis of Ag/AgCI/chitosan composites by one-step and their photocatalytic degradation performance under visible-light irradiation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2017年第2期11卷 130-138页

作者： Hao WANG Yuhan wu Pengcheng wu Shanshan CHEN Xuhong GUO Guihua MENG Banghua PENG jianning wu Zhiyong LIU School of Chemistry & Chemical Engineering Shihezi University/Key Laboratory of Green Processing for Chemical Engineering/ Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan Shihezi 832003 China State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

A novel Ag/AgCl/chitosan composite photocatalyst was successfully prepared by a simple one-step method. During this progress, environmentally benign chitosan not only served as reductant to reduce Ag＋ to Ag0 species, but also acted as supporter for Ag/AgCI nanoparticles. XRD, SEM, EDX, UV-vis DRS and XPS were employed to characterize the as-prepared simples. SEM images of Ag/AgCI/chitosan composites revealed that Ag/AgCI nanoparticles were successfully loaded onto chitosan without obvious aggregation. All Ag/AgCI/chitosan composites exhibited efficient photocatalytic activity for the degradation of rhodamine B （RhB） under visible-light irradiation. The result of photocatalytic degradation experiment indicated that 20% of the mass ratio of AgCI to chitosan was the optimum, and after 40 min photocatalytic reaction, the degradation rate reached about 96%.

关键词： Ag/AgCI surface plasmon resonance one-step chitosan photocatalysis

A novel black TiO2/ZnO nanocone arrays heterojunction on carbon cloth for highly efficient photoelectrochemical performance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2019年第1期13卷 43-53页

作者： Pengcheng wu Chang LIU Yan LUO Keliang wu jianning wu Xuhong GUO Juan H0U Zhiyong LIU School of Chemistry and Chemical Engineering Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang BingtuanShihezi 832003China College of Science/Key Laboratory of Ecophysics and Department of Physics of Xinjiang Bingtuan Shihezi 832003China

ZnO nanocone arrays(NCAs)decorated with black TiO2 nanoparticles(BTiO2 NPs)were uniformly anchored on the surface of carbon cloth(CC)directly by a simply electrochemical deposition *** a novel B-TiO2 NPs/ZnO NCAs-CC hierarchical heterostructure was *** displayed superior performance and achieved a higher photocurrent over 0.4 mA·cm^-2 before the onset of the dark current,attributed to the separation of the photogenerated electron-hole *** on the B-TiO2 NPs/ZnO NCAs-CC heterostructure,the catalyst was fabricated for promoting the separation of charge ***,the introduction of Ti^3+ and oxygen vacancies on the surface of TiO2 NPs expanded the absorption band edge and enhanced the electrical conductivity as well as the charge transportation on the catalytic *** indicates that the B-TiO2 NPs/ZnO NCAs-CC composite is beneficial to the improvement of the photoelectrochemical(PEC)activity.

关键词： black TiO2 nanoparticles ZnO nanocones arrays carbon cloth

Folate-conjugated pH-responsive nanocarrier designed for active tumor targeting and controlled release of doxorubicin

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2017年第4期11卷 328-343页

作者： Lulu WEI Beibei LU Lin CUI Xueying PENG jianning wu Deqiang LI Zhiyong LIU Xuhong GUO School of Chemistry & Chemical Engineering Shihezi University/Key Laboratory of Green Processing for Chemical Engineering/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan Shihezi 832003 China School of Medicine Shihezi University Shihezi 832003 China College of Chemistry and Chemical Engineering Xinjiang Agricultural University Urumqi 830001 China State Key Laboratory of Chemical Engineering East China Universityof Science and Technologyl Shanghai 200237 China

A novel type of amphiphilic pH-responsive folate-poly（ε-caprolactone）- block-poly（ 2-hydroxyethylmethacrylate ）-co-poly（ 2-（ dimethylamino ）-ethylmethacrylate ）（FA-PCL-b-P（HEMA-co-DMAEMA））（MFP） block copolymers were designed and synthe- sized via atom transfer radical polymerization （ATRP） and ring opening polymerization （ROP） techniques. The molecular structures of the copolymers were confirmed with IH NMR, FTIR and GPC measurements. The critical micelle concentration （CMC） of MFP in aqueous solution was extremely low （about 6.54 mglL）. The in vitro release behavior of DOX-Ioaded micelles was significantly accelerated when the pH value of solution decreased from 7.4 to 5.0. In vitro antitumor efficiency was evaluated by incubating DOX- loaded micelles with Hela cells. The results demonstrated that this copolymer possessed excellent biocompatibility, and FA-decorated micelles MFP showed higher cellular uptake than those micelles without the FA moiety, indicating their unique targetability. These folate-conjugated biodegradable micelles are highly promising for targeted cancer chemothe-rapy.

关键词： amphiphilic polymer pH-sensitive active targeting drug delivery system folic acid

SGT-Net: A Transformer-Based Stratified Graph Convolutional Network for 3D Point Cloud Semantic Segmentation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第6期79卷 4471-4489页

作者： Suyi Liu jianning Chi Chengdong wu Fang Xu Xiaosheng Yu Faculty of Robot Science and Engineering Northeastern UniversityShenyang110167China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang110016China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang110169China SIASUN Robot&Automation Co. Ltd.Shenyang110169China

In recent years,semantic segmentation on 3D point cloud data has attracted much *** 2D images where pixels distribute regularly in the image domain,3D point clouds in non-Euclidean space are irregular and inherently ***,it is very difficult to extract long-range contexts and effectively aggregate local features for semantic segmentation in 3D point cloud *** current methods either focus on local feature aggregation or long-range context dependency,but fail to directly establish a global-local feature extractor to complete the point cloud semantic segmentation *** this paper,we propose a Transformer-based stratified graph convolutional network(SGT-Net),which enlarges the effective receptive field and builds direct long-range ***,we first propose a novel dense-sparse sampling strategy that provides dense local vertices and sparse long-distance vertices for subsequent graph convolutional network(GCN).Secondly,we propose a multi-key self-attention mechanism based on the Transformer to further weight augmentation for crucial neighboring relationships and enlarge the effective receptive *** addition,to further improve the efficiency of the network,we propose a similarity measurement module to determine whether the neighborhood near the center point is *** demonstrate the validity and superiority of our method on the S3DIS and ShapeNet *** ablation experiments and segmentation visualization,we verify that the SGT model can improve the performance of the point cloud semantic segmentation.

关键词： 3D point cloud semantic segmentation long-range contexts global-local feature graph convolutional network dense-sparse sampling strategy

Synthesis of pH-responsive triazine skeleton nano-polymer composite containing AIE group for drug delivery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2021年第1期15卷 113-123页

作者： Yifan ZHANG Xueying PENG Xinbo JING Lin CUI Shengchao YANG jianning wu Guihua MENG Zhiyong LIU Xuhong GUO School of Chemistry and Chemical Engineering Shihezi University/Key Laboratory of Green Process for Chemical Engineering/Key Laboratory for Chemical Materials of Xinjiang Uygur Autonomous Region/Engineering Center for Chemical Materials of Xinjiang BingtuanShihezi UniversityShihezi 832003China School of Medicine Shihezi UniversityShihezi 832003China State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

We exploited a unique porous structure of the nano-covalent triazinepolymer(NCTP)containing aggregation-induced emission(AlE)group to achievecontrolled release and drug tracking in tumor acidic *** wassynthesized by the Friedel-Crafts alkylation and the McMurry coupling *** notonly had strong doxorubicin(DOX)-loading capacity due to its high specific surface areaand large pore volume,but also showed the significant cumulative drug release as aresult of the pH response of triazine *** was induced luminescence aftermass accumulation near tumor ***,it had excellent biocompatibility andobvious antineoplastic *** results demonstrate that NCTP as a utility-type drugcarrier provides a new route for designing the multi-functional drug delivery platform.

关键词： triazine skeleton structure pH response aggregation-induced emission drug dolivery

Facile preparation of low swelling,high strength,self-healing and pH-responsive hydrogels based on the triple-network structure

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2019年第1期13卷 54-63页

作者： Zhicun WANG Xiaoman HAN Yixi WANG Kenan MEN Lin CUI jianning wu Guihua MENG Zhiyong LIU Xuhong GUO School of Chemistry and Chemical Engineering Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang BingtuanShihezi 832003China Bingtuan Sishi Hospital Yili 835000China School of Medicine Shihezi UniversityShihezi 832003China State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

A polyacrylic acid(PAA)/gelatin(Gela)/polyvinyl alcohol(PVA)hydrogel was prepared by copolymerization,cooling,and freezing/thawing *** triplenetwork(TN)structure hydrogel displayed superior mechanical properties,low swelling ratio and self-healing properties,The superior mechanical properties are attributed to the triple helix association of Gela and PVA crystallites by reversible hydrogen *** characterization results indicated that the fracture stress and the strain were 808 kPa and 370% respectively,while the compression strength could reach 4443 kPa and the compressive modulus was up to 39 MPa under the deformation of 90%.The hydrogen bonding in PVA contributed to maintain and improve the self-healing ability of *** type of hydrogels exhibited a higher swelling ratio under alkaline conditions,and the swelling ratios of PAA,PAA/PVA and PAA/Gela hydrogels were 27.71,12.30 and 9.09,*** PAA/Gela/PVA TN hydrogel showed the lowest swelling ratio(6.57)among these *** results indicate that the novel TN hydrogels possess good environmental adaptability and have potential applications in the biomedical engineering and sensor field.

关键词： hydrogel triple-network structure mechanical property swelling selfhealing