Qingdao UniversityShandong

Qingdao, China

Qingdao UniversityShandong

Qingdao, China
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Xue Z.-Z.,Qingdao UniversityShandong | Pan J.,Qingdao UniversityShandong | Li J.-H.,Qingdao UniversityShandong | Wang Z.-H.,Qingdao UniversityShandong | Wang G.-M.,Qingdao UniversityShandong
Journal of Molecular Structure | Year: 2017

Two new gallium phosphate/phosphite-oxalates hybrid solids, {[H2dmpip][Ga2(HPO4)2(PO4)(C2O4)0.5]·H2O} (1) and [H2apm][Ga2(H2PO3)2(HPO3)2(C2O4)] (2), where dmpip = 2,6-dimethyl-piperazine and apm = N-(3-aminopropyl)morpholine, have been synthesized and structurally characterized. Both of compounds 1 and 2 are formed by the connectivity of the Ga-based polyhedral, phosphite/phosphate groups as well as oxalate units. Compound 1 possesses a two-dimensional layer structure, in which the C2O4 units via an in-plane linkage connect two Ga center within the sheet. While in 2, the C2O4 units serve as bis-bidentates ligands bridging two GaO6 octahedra from two distinct gallium-phosphite chains to give rise to inorganic-organic hybrid layer with 8-membered rings. In these materials, the structure-directing amines reside in the interlayer region and interact with the layers by way of hydrogen-bonds. © 2017 Elsevier B.V.

Gui R.,Qingdao UniversityShandong | Jin H.,Qingdao UniversityShandong | Wang Z.,Qingdao UniversityShandong | Tan L.,Shanghai JiaoTong University
Coordination Chemistry Reviews | Year: 2017

During the past two decades, great effort has been dedicated to two-photon excited colloidal quantum dots (QDs) because of their unique optical properties and significant applications. Under two-photon excitation, colloidal semiconductor QDs and carbon-family QDs show the nonlinear two-photon absorption (TPA) that is essential to the applications of two-photon microscopy and fluorescence up-conversion. For the first time, this review systematically summarizes the optical properties and potential applications of two-photon excited colloidal QDs with different categories. The optical properties of two-photon excited colloidal QDs include the typical nonlinear optical behavior, TPA, two-photon excited fluorescence (TPEF), time-resolved TPEF and TPEF lifetimes. The applications of two-photon excited colloidal QDs are wholly covered, including the cellular and in vivo imaging, chem./bio-detection, photodynamic therapy, controlled drug release, photocatalysis, photoelectric conversion, etc. This review comments the recent advances in the vibrant topic of colloidal QDs, and also highlights the optical phenomenon, related mechanisms and important applications. Finally, the probable challenges and perspectives in the forthcoming development of two-photon excited colloidal QDs are addressed. © 2017 Elsevier B.V.

Gao Z.,CAS Institute of Biophysics | Gao Z.,University of Chinese Academy of Sciences | Chen L.,Bengbu Medical College | Fan R.,Bengbu Medical College | And 11 more authors.
Frontiers in Cellular Neuroscience | Year: 2016

Somatosensory signals and operative skills learned by unilateral limbs can be retrieved bilaterally. In terms of cellular mechanism underlying this unilateral learning toward bilateral memory, we hypothesized that associative memory cells in bilateral cortices and synapse innervations between them were produced. In the examination of this hypothesis, we have observed that paired unilateral whisker and odor stimulations led to odorant-induced whisker motions in bilateral sides, which were attenuated by inhibiting the activity of barrel cortices. In the mice that showed bilateral cross-modal responses, the neurons in both sides of barrel cortices became to encode this new odor signal alongside the innate whisker signal. Axon projections and synapse formations from the barrel cortex, which was co-activated with the piriform cortex, toward its contralateral barrel cortex (CBC) were upregulated. Glutamatergic synaptic transmission in bilateral barrel cortices was upregulated and GABAergic synaptic transmission was downregulated. The associative activations of the sensory cortices facilitate new axon projection, glutamatergic synapse formation and GABAergic synapse downregulation, which drive the neurons to be recruited as associative memory cells in the bilateral cortices. Our data reveal the productions of associative memory cells and synapse innervations in bilateral sensory cortices for unilateral training toward bilateral memory. © 2016 Gao, Chen, Fan, Lu, Wang, Cui, Huang, Zhao, Guan, Zhu and Wang.

Wang Z.,Qingdao UniversityShandong | Yan Z.,Tsinghua University | Yan Z.,Qingdao UniversityShandong | Yan Z.,Beijing Center for Physical and Chemical Analysis | And 5 more authors.
Biosensors and Bioelectronics | Year: 2017

A turn-on photoelectrochemical (PEC) biosensor based on the surface defect recognition and multiple signal amplification of metal-organic frameworks (MOFs) was proposed for highly sensitive protein kinase activity analysis and inhibitor evaluation. In this strategy, based on the phosphorylation reaction in the presence of protein kinase A (PKA), the Zr-based metal-organic frameworks (UiO-66) accommodated with [Ru(bpy)3]2+ photoactive dyes in the pores were linked to the phosphorylated kemptide modified TiO2/ITO electrode through the chelation between the Zr4+ defects on the surface of UiO-66 and the phosphate groups in kemptide. Under visible light irradiation, the excited electrons from [Ru(bpy)3]2+ adsorbed in the pores of UiO-66 injected into the TiO2 conduction band to generate photocurrent, which could be utilized for protein kinase activities detection. The large surface area and high porosities of UiO-66 facilitated a large number of [Ru(bpy)3]2+ that increased the photocurrent significantly, and afforded a highly sensitive PEC analysis of kinase activity. The detection limit of the as-proposed PEC biosensor was 0.0049 U mL−1 (S/N!=!3). The biosensor was also applied for quantitative kinase inhibitor evaluation and PKA activities detection in MCF-7 cell lysates. The developed visible-light PEC biosensor provides a simple detection procedure and a cost-effective manner for PKA activity assays, and shows great potential in clinical diagnosis and drug discoveries. © 2017 Elsevier B.V.

Ni A.-Y.,Qingdao UniversityShandong | Pan J.,Qingdao UniversityShandong | Xue Z.-Z.,Qingdao UniversityShandong | Han S.-D.,Qingdao UniversityShandong | And 3 more authors.
Solid State Sciences | Year: 2017

The hydrothermal reaction of zinc ions with 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) in the presence of additives such as 1,4-diazabicyclo[2.2.2]octane (DABCO), 1,3-propanediamine, imidazole and isonipecotic acid, afforded five metal phosphonates, namely, [H2DABCO]{Zn3[CH3C(OH)(PO3)2]2} (1), [C3H14N2]{Zn3[CH3C(OH)(PO3)2]2} (2), [C3H5N2]2{Zn3[CH3C(OH)(PO3)2]2} (3), {Zn2[CH3C(OH)(PO3)2][C3H4N2]2} (4) and {Zn2[CH3C(OH)(PO3)2][C6H11NO2]2[H2O]2}·H2O (5). Compounds 1 and 2 are isostructural and adopt a pillar-layered 3D structure. Compound 3 is a 3D framework in which [ZnO4] tetrahedra are connected by HEDP molecules with tetradentate mode. The [ZnO3N] tetrahedra in 4 shares corners with the [CPO3] tetrahedra into a 3D framework with twelve-membered ring. It is also found that 4 displays interesting left-handed helical chains along [100] direction. In 5, HEDP molecules exhibit tetradentate coordination fashion to combine Zn atoms into a complicated 2D hybrid layer, resulting in the coordinated isonipecotic acid rings being sandwiched between the layers. All the compounds have been characterized by infrared spectra (IR), elemental analyses, powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. © 2017 Elsevier Masson SAS

Yu J.,Qingdao UniversityShandong | Jin H.,Qingdao UniversityShandong | Gui R.,Qingdao UniversityShandong | Lv W.,Qingdao UniversityShandong | Wang Z.,Qingdao UniversityShandong
Journal of Electroanalytical Chemistry | Year: 2017

This paper described a facile strategy for ratiometric electrochemical sensing of quercetin (Qu) in electrolyte solution directly using bare glassy carbon electrode (GCE). This strategy mentioned to two kinds of substances with remarkable oxidation current peaks at differential electric potentials, such as thionine (TH) and Qu with oxidation current peaks at − 0.22 V and 0.18 V, respectively. Briefly, a GCE was immersed into the electrolyte solution of phosphate buffered saline (0.01 M, pH 6.5, containing 0.15 M of NaCl). Serving as the reference electroactive substance, TH was injected to fabricate a homogeneous electrolyte solution. Afterward, Qu as the analyte was also added to form a facile electrochemical sensing system. Differential pulse voltammetry (DPV) curves of the different sensing systems with increasing concentrations of Qu [Qu] were measured by directly using a bare GCE as the sensing platform. Upon the increase of [Qu], the oxidation current peak intensity of Qu at 0.18 V increased significantly, but that of TH at − 022 V hardly any changed. The ratiometric oxidation current peak intensities of Qu to TH (IQu/ITH) almost linearly enhanced when the [Qu] increased from 0.1 to 15 μM, together with a high linear coefficient (R2 = 0.9932) and a low detection limit (3.1 nM of Qu). The as-developed ratiometric electrochemical sensor of Qu exhibited highly selective and sensitive responses to Qu over potential interferences in real food samples, accompanied by high detection recoveries. © 2017 Elsevier B.V.

Pan J.,Qingdao UniversityShandong | Zhang D.,Qingdao UniversityShandong | Xue Z.-Z.,Qingdao UniversityShandong | Wang G.-M.,Qingdao UniversityShandong
Inorganic Chemistry Communications | Year: 2017

According to hard and soft (Lewis) acids and bases (HSAB) theory, a novel 3d-3d heterometallic-organic framework based on Cu4I4 clusters and binuclear Zn(II) moieties was successfully synthesized. The linkage of different secondary building units (SBUs) with the bifunctional ligand which contains N and O atoms simultaneously generates an intriguing 2-fold interpenetrated network. The synthesis, structural characterization and photoluminescence property of the compound have been investigated. © 2017 Elsevier B.V.

Zhu S.,Qingdao UniversityShandong | Tian M.,Qingdao UniversityShandong
Materials Letters | Year: 2015

Abstract PET flame-retardant fabric with the presence of sensitizer trimethylolpropane triacrylate has been prepared by supercritical CO2 progressing method and then irradiated by electron irradiation. Irradiation changed the burning behavior of the PET flame-retardant fabric which had no dripping but burned up with the flaming and char forming. In order to explain the irradiation effect, XPS is used to investigate the change of the chemical bonds. The XPS data analysis indicated that during irradiation, the effective flame-retarded group C-O-P was broken, so its flame retardance disappeared at time of combustion, while there was no melt drip because the crosslinking was introduced by irradiation. © 2015 Elsevier B.V.

Wang Z.,Qingdao UniversityShandong | Zhao C.,Qingdao UniversityShandong | Gui R.,Qingdao UniversityShandong | Jin H.,Qingdao UniversityShandong | And 3 more authors.
Coordination Chemistry Reviews | Year: 2016

Graphene (Gr) has a large specific surface area, high conductivity, high chemical stability, and mechanical strength. These desirable properties greatly facilitate the application of Gr in many fields, especially physics, chemistry, and materials science. To extend the applications of Gr, nanocomposites of Gr conjugated with metals, polymers, and semiconductors have been prepared in recent years, which have been applied extensively in significant areas such as energy storage, nanoelectronic devices, and sensors. During the latest decade, transition metal dichalcogenides (TMDs)/Gr nanocomposites have attracted increasing attention and developed rapidly as a hot research area because of their excellent properties and promising applications. This review systematically summarizes the synthetic methods and potential applications of TMDs/Gr nanocomposites. First, the structures and properties of TMDs/Gr nanocomposites are introduced. Second, synthetic methods for TMDs/Gr nanocomposites with different compositions and structures are summarized, including hydrothermal, solvothermal, chemical vapor deposition, microwave-assisted, and dry/wet transfer methods. Third, the potential applications of different TMDs/Gr nanocomposites in important fields are highlighted in electronic and optical devices, such as rechargeable batteries, hydrogen evolution reactions, solar photovoltaic cells, supercapacitors, electronic devices, and sensors. Finally, this review considers the advantages and disadvantages of different synthetic methods as well as the applications of TMDs/Gr nanocomposites. Possible future research areas related to the synthetic methods and applications of TMDs/Gr nanocomposites are suggested. © 2016 Elsevier B.V.

Wang G.-M.,Qingdao UniversityShandong | Li J.-H.,Qingdao UniversityShandong | Wei L.,Qingdao UniversityShandong | Han S.-D.,Qingdao UniversityShandong | And 2 more authors.
CrystEngComm | Year: 2015

A novel open-framework beryllium phosphite, [H4tren][Be6(HPO3)8]·(H2O)3 (1, tren = tris(2-aminoethyl)amine), was synthesized under solvothermal conditions. Its structure features a 3D interrupted network with a low density (1.594 g cm-3), and 1 represents the first example of a beryllium phosphite material with extra-large 18-ring channels. © The Royal Society of Chemistry 2015.

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