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Shrikant S Raut, Babasaheb R Sankapal
One-step, simple and inexpensive successive ionic layer adsorption and reaction (SILAR) method has been used to synthesize porous network of zinc cobaltite (ZnCo2O4) in 2D form on stainless steel (SS) substrate. Porous structure of ZnCo2O4 electrode enables electrochemical specific capacitance of 675Fg(-1) at 5mVs(-1) sweep rate with high rate capability and cycling performance of 69% over 2000 cycles. Furthermore, fabricated ZnCo2O4 solid-state supercapacitor cell in symmetric mode using PVA-KOH gel electrolyte exhibited a specific capacitance of 69...
October 14, 2016: Journal of Colloid and Interface Science
Maria Giretova, Lubomir Medvecky, Radoslava Stulajterova, Tibor Sopcak, Jaroslav Briancin, Monika Tatarkova
Polyhydroxybutyrate/chitosan/calcium phosphate composites are interesting biomaterials for utilization in regenerative medicine and they may by applied in reconstruction of deeper subchondral defects. Insufficient informations were found in recent papers about the influence of lysozyme degradation of chitosan in calcium phosphate/chitosan based composites on in vitro cytotoxicity and proliferation activity of osteoblasts. The effect of enzymatic chitosan degradation on osteoblasts proliferation was studied on composite films in which the porosity of origin 3D scaffolds was eliminated and the surface texture was modified...
December 2016: Journal of Materials Science. Materials in Medicine
Delfo D'Alessandro, Giuseppe Perale, Mario Milazzo, Stefania Moscato, Cesare Stefanini, Gianni Pertici, Serena Danti
The ideal scaffold for bone regeneration is required to be highly porous, non-immunogenic, biostable until the new tissue formation, bioresorbable and osteoconductive. This study aimed at investigating the process of new bone formation in patients treated with granular SmartBone(®) for sinus augmentation, providing an extensive histologic analysis. Five biopsies were collected at 4-9 months post SmartBone(®) implantation and processed for histochemistry and immunohistochemistry. Histomorphometric analysis was performed...
October 18, 2016: International Journal of Pharmaceutics
Nikolaj S Winther, Claus L Jensen, Claus M Jensen, Thomas Lind, Henrik M Schrøder, Gunnar Flivik, Michael M Petersen
BACKGROUND: Regenerex is a novel porous titanium construct with a three-dimensional porous structure and biomechanical characteristics close to that of normal trabecular bone. The aim of this study was to compare this novel construct to a well-proven porous plasma sprayed tibial (PPS) implant after total knee arthroplasty. METHODS: Sixty-one patients scheduled for an uncemented TKA were randomized to receive either a novel highly porous titanium construct Regenerex or the PPS tibial component...
October 18, 2016: Knee
Dongping Yu, Zhimou Guo, Aijin Shen, Jingyu Yan, Xuefang Dong, Gaowa Jin, Zhen Long, Lina Liang, Xinmiao Liang
Zwitterionic polymer stationary phases have attracted increasing attention in hydrophilic interaction chromatography (HILIC). In this work, a zwitterionic sulfobetaine functionalized polyacrylamide stationary phase (named TENS) based on porous silica particles was prepared via controlled surface initiated reversible addition-fragmentation transfer (RAFT) polymerization. Instead of traditional methacrylate type sulfobetaine monomer, acrylamide type sulfobetaine monomer, which has higher chemical stability and hydrophicility, was employed in this work...
December 1, 2016: Talanta
Xiyue Xiong, Haiqin He, Yan Shu, Yuxin Li, Zihui Yang, Yingzhuang Chen, Ming Ma, Bo Chen
A facile, flexible process was developed for the preparation of surface-glycosylated porous monolithic columns via aqueous two-phase graft copolymerization of polyethylene glycol diacrylate (PEGDA) and water-soluble dextran (dextran sulfate). The formation of poly(PEGDA) porous skeletons and surface glycosylation were achieved via a one-step process without pre-modification of the dextran. The synthesis conditions were thoroughly optimized. The optimal monolithic column exhibited a large dry state surface area (greater than 400m(2)/g), and it was evaluated as a hydrophilic liquid chromatography (HILIC) stationary phase...
December 1, 2016: Talanta
Xiangheng Niu, Jianming Pan, Fengxian Qiu, Xin Li, Yongsheng Yan, Libo Shi, Hongli Zhao, Minbo Lan
Enzyme-free electrochemical detection of glucose in alkaline media with favorable properties has been acquired by fabricating a robust and large-surface sensing platform, which is composed of anneal-shrinked Cu2O dendrites grown on porous Cu foam. On the one hand, the good compatibility of electrodeposited Cu2O architectures and Cu foam substrate, together with a post-deposition anneal at 200°C, offers a mechanically stable interface for glucose determination. On the other hand, the macropores of Cu foam that is decorated with unique Cu2O dendrites provide large active surface for electrocatalytic reaction and mass transport...
December 1, 2016: Talanta
Mingxue Wu, Gang Chen, Jiutong Ma, Ping Liu, Qiong Jia
Covalent organic frameworks (COFs) are an emerging class of porous organic frameworks with diverse promising applications. Herein, we presented the first example of cross-linked hydrazone COFs (cross-linked COFs) coating via thiol-ene click chemistry for solid phase microextraction (SPME). Strong covalent bonds and interlayer of the prepared networks ensured the adsorption capacity and durability of the novel SPME fiber. π-π conjugated structure existed because of abundant phenyl rings and -C=N groups in the cross-lined COFs...
December 1, 2016: Talanta
Mingyang Liu, Lijun Yang, Lei Zhang
In this study, a functionalized magnetic hollow porous oval-shape NiFe2O4 (MHPO-NiFe2O4) was designed by a facile synthesis procedure, and employed as magnetic solid phase extraction (MSPE) material to extract several heavy metal ions. As-prepared MHPO-NiFe2O4 exhibited superior adsorption capacities of 20.17, 16.64, 16.82, 9.69 and 16.58mgg(-1), for Cu(II), Cd(II), Cr(III), Co(II) and Zn(II), and was then used to detect these heavy metals elements in real samples by combining with inductively coupled plasma optical emission spectroscopy (ICP-OES)...
December 1, 2016: Talanta
Wenchang Wang, Juntao Wang, Shuaihua Zhang, Penglei Cui, Chun Wang, Zhi Wang
A novel covalent organic framework, Schiff base network-1 (SNW-1), was synthesized and used as a solid-phase microextraction (SPME) fiber coating material. The SNW-1 coated SPME fiber was fabricated by a covalent chemical cross-linking between the SNW-1 nanocomposite and a silanol-functionalized stainless steel wire substrate. Scanning electron microscopy and nitrogen isothermal adsorption results indicate that the new fiber coating exhibited a porous, homogenous surface with the Brunauer-Emmett-Teller surface of 668m(2)g(-1)...
December 1, 2016: Talanta
Huifang Zhang, Sheng Hu, Dandan Song, Hui Xu
In this paper, a novel polydopamine modified polystyrene/graphene electrospun nanofiber membrane (PS/G@PDA) was fabricated on the surface of filter paper and used for thin film microextraction (TFME) for the first time. Benefiting from the hydrophilic polydopamine (PDA) coating and the porous fibrous structure, the PS/G@PDA membrane exhibited large surface area, high extraction efficiency, rapid extraction equilibrium, special selectivity and excellent biocompatibility. A thin film microextraction-high performance liquid chromatography method was developed and applied for the analysis of six aldehyde metabolites in human urine samples...
November 2, 2016: Analytica Chimica Acta
Jowita Marszewska, Mietek Jaroniec
Highly-porous carbon spheres were prepared by modified Stöber method combined with silica templating and CO2 activation. Silica was delivered in the form of either colloids or tetraethyl orthosilicate and used to create porosity. Subsequently, CO2 activation was used to develop microporosity. CO2 activation was done either: (1) on carbon spheres, following silica etching or (2) on silica-carbon composites, before silica removal. Both methods delivered carbon materials with well-developed structures and, importantly, preserved spherical morphology...
October 15, 2016: Journal of Colloid and Interface Science
Qingchun Xia, Yan Liu, Zijian Li, Wei Gong, Yong Cui
A porous Cr(salen)-MOF can serve as an efficient and effective heterogeneous catalyst for a series of important asymmetric transformations including the Nazarov cyclization, aminolysis reaction, and Diels-Alder and hetero Diels-Alder reactions, resulting in comparable or superior diastereo- or enantioselectivity with respect to the corresponding homogeneous systems.
October 21, 2016: Chemical Communications: Chem Comm
Wei Zhang, M Can Gulersonmez, Thomas Hankemeier, Rawi Ramautar
In metabolomics, a wide range of analytical techniques is used for the global profiling of (endogenous) metabolites in complex samples. In this paper, a protocol is presented for the analysis of anionic and cationic metabolites in biological samples by capillary electrophoresis-mass spectrometry (CE-MS). CE is well-suited for the analysis of highly polar and charged metabolites as compounds are separated on the basis of their charge-to-size ratio. A recently developed sheathless interfacing design, i.e., a porous tip interface, is used for coupling CE to electrospray ionization (ESI) MS...
October 1, 2016: Journal of Visualized Experiments: JoVE
Masaru Nakagawa, Akifumi Nakaya, Yasuto Hoshikawa, Shunya Ito, Nobuya Hiroshiba, Takashi Kyotani
Ultraviolet (UV) nanoimprint lithography is a promising nanofabrication technology with cost efficiency and high throughput for sub-20 nm size semiconductor, data storage, and optical devices. To test formability of organic resist mask patterns, we investigated whether the type of polymerizable di(meth)acrylate monomer affected the fabrication of cured resin nanopillars by UV nanoimprinting using molds with pores of around 20 nm. We used carbon-coated, porous, anodic aluminum oxide (AAO) films prepared by electrochemical oxidation and thermal chemical vapor deposition as molds, because the pore diameter distribution in the range of 10-40 nm was suitable for combinatorial testing to investigate whether UV-curable resins comprising each monomer were filled into the mold recesses in UV nanoimprinting...
October 21, 2016: ACS Applied Materials & Interfaces
Xin Wang, Thor E Friis, Paul P Masci, Ross W Crawford, Wenbo Liao, Yin Xiao
The quality of hematomas are crucial for successful early bone defect healing, as the structure of fibrin clots can significantly influence the infiltration of cells, necessary for bone regeneration, from adjacent tissues into the fibrin network. This study investigated if there were structural differences between hematomas from normal and delayed healing bone defects and whether such differences were linked to changes in the expression of IL-1β. Using a bone defect model in rats, we found that the hematomas in the delayed healing model had thinner fibers and denser clot structures...
October 21, 2016: Scientific Reports
Juan P Cattalini, Judith Roether, Alexander Hoppe, Fatemeh Pishbin, Luis Haro Durand, Alejandro Gorustovich, Aldo R Boccaccini, Silvia Lucangioli, Viviana Mouriño
Novel multifunctional nanocomposite scaffolds made of nanobioactive glass and alginate crosslinked with therapeutic ions such as calcium and copper were developed for delivering therapeutic agents, in a highly controlled and sustainable manner, for bone tissue engineering. Alendronate, a well-known antiresorptive agent, was formulated into microspheres under optimized conditions and effectively loaded within the novel multifunctional scaffolds with a high encapsulation percentage. The size of the cation used for the alginate crosslinking impacted directly on porosity and viscoelastic properties, and thus, on the degradation rate and the release profile of copper, calcium and alendronate...
October 21, 2016: Biomedical Materials
Dureid Qazzazie, Mohammad Halhouli, Olena Yurchenko, Gerald Urban
The lack of performance of graphene-based electrocatalysts for oxygen reduction (ORR) is a major concern for fuel cells which can be mastered using nanocomposites. This work is highlighted by the optimization of nitrogen(N)-doped graphene/carbon nanotubes (CNTs) nanocomposite's ORR performance examined by galvanostatic measurements in realistically approached glucose half-cells. Obtained results mark an essential step for the development of nanocarbon-based cathodes, as we specifically evaluate the electrode performance under real fuel cell conditions...
October 21, 2016: Nanotechnology
Quelen Letícia Shimabuku, Flávia Sayuri Arakawa, Marcela Fernandes Silva, Priscila Ferri Coldebella, Tânia Ueda-Nakamura, Márcia Regina Fagundes-Klen, Rosangela Bergamasco
Continuous flow experiments (450 mL min(-1)) were performed in household filter in order to investigate the removal and/or inactivation of T4 bacteriophage, using granular activated carbon (GAC) modified with silver and/or copper oxide nanoparticles at different concentrations. GAC and modified GAC were characterized by X-ray diffractometry, specific surface area, pore size and volume, pore average diameter, scanning electron microscopy, transmission electron microscopy, zeta potential and atomic absorption spectroscopy...
October 21, 2016: Environmental Technology
Lei Sun, Sarah S Park, Dennis Sheberla, Mircea Dinca
Electrically conductive metal-organic frameworks (MOFs) are emerging as a subclass of porous materials that can have a transformative effect on electronic and renewable energy devices. Systematic advances in these materials depend critically on the accurate and reproducible characterization of their electrical properties. This is made difficult by the numerous techniques available for electrical measurements and the dependence of metrics on device architecture and numerous external variables. These challenges, common to all types of electronic materials and devices, are especially acute for porous materials, whose high surface area make them even more susceptible to interactions with contaminants in the environment...
October 21, 2016: Journal of the American Chemical Society
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