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Luis Estevez, Venkateshkumar Prabhakaran, Adam L Garcia, Yongsoon Shin, Jinhui Tao, Ashleigh M Schwarz, Jens Darsell, Priyanka Bhattacharya, Vaithiyalingam Shutthanandan, Ji-Guang Zhang
Developing hierarchical porous carbon (HPC) materials with competing textural characteristics such as surface area and pore volume in one material is difficult to accomplish-particularly for an atomically ordered graphitic carbon. Herein we describe a synthesis strategy to engineer tunable HPC materials across micro- meso- and macroporous length scales, allowing the fabrication of a graphitic HPC material (HPC-G) with both very high surface area (>2500 m(2)/g) and pore volume (>11 cm(3)/g), the combination of which has not been attained previously...
October 18, 2017: ACS Nano
Jianqiang Wang, Wenqi Zhang, Changqing Gu, Wenpei Zhang, Man Zhou, Zhiwei Wang, Cheng Guo, Linbing Sun
A new amino-acid bridged periodic mesoporous organosilicas (PMOs) have been constructed via hydrolysis and condensation reactions under acid condition in the presence of template. The tyrosine bissilylated organic precursor (TBOS) was first prepared through multi-step reaction using tyrosine (natural amino acid) as starting material. The PMOs with the framework of tyrosine (Tyr-PMOs) were architected by simultaneously using TBOS and TEOS as complex silicon source in the condensation process. All the Tyr-PMOs materials were characterized by XRD, FT-IR, N2 adsorption-desorption, TEM, SEM and 29Si solid-state NMR to confirm the structure...
October 18, 2017: Chemistry, An Asian Journal
Qi Jiang, Zema Chu, Pengyang Wang, Xiaolei Yang, Heng Liu, Ye Wang, Zhigang Yin, Jinliang Wu, Xingwang Zhang, Jingbi You
Low temperature solution processed planar-structure perovskite solar cells gain great attention recently, while their power conversions are still lower than that of high temperature mesoporous counterpart. Previous reports are mainly focused on perovskite morphology control and interface engineering to improve performance. Here, this study systematically investigates the effect of precise stoichiometry, especially the PbI2 contents on device performance including efficiency, hysteresis and stability. This study finds that a moderate residual of PbI2 can deliver stable and high efficiency of solar cells without hysteresis, while too much residual PbI2 will lead to serious hysteresis and poor transit stability...
October 16, 2017: Advanced Materials
Tin Kang, Cheng-Min Tsai, Yu-He Jiang, Ganesh Gollavelli, Nayantara Mohanta, Eric Wei-Guang Diau, Chain-Shu Hsu
Two fullerene derivatives with styryl and oxetane cross-linking groups served as interfacial materials to modify an electron-transporting layer (ETL) of TiO2, doped with Au nanoparticles, processed under low-temperature conditions to improve the performance of perovskite solar cells (PSC). The cross-linkable [6, 6]-phenyl-C61-butyric styryl dendron ester (C-PCBSD) was produced via thermal treatment at 160 (○)C for 20 min while the cross-linkable [6, 6]-phenyl-C61-butyric oxetane dendron ester (C-PCBOD) was obtained via UV-curing treatment for 45 s...
October 18, 2017: ACS Applied Materials & Interfaces
Huayu Qian, Jing Tang, Md Shahriar A Hossain, Yoshio Bando, Xin Wang, Yusuke Yamauchi
Mesoporous hollow carbon spheres with Pt nanoparticles (NPs) loaded on their inner walls (Pt@HC-meso) have been designed and prepared through a dual-templating method. The core-shell structured Pt/SiO2@micelle-polydopamine (PDA) precursor is obtained by first depositing Pt NPs on silica spheres and then coating them with the carbon precursor of PDA and diblock copolymer micelles as soft templates. The subsequent carbonization and KOH etching convert the micelle-PDA shells into mesoporous carbon and remove the silica cores, respectively...
October 18, 2017: Nanoscale
Aniruddha K Kulkarni, C S Praveen, Yogesh A Sethi, Rajendra P Panmand, Sudhir S Arbuj, Sonali D Naik, Anil V Ghule, Bharat B Kale
The synthesis of orthorhombic nitrogen-doped niobium oxide (Nb2O5-xNx) nanostructures was performed and a photocatalytic study carried out in their use in the conversion of toxic H2S and water into hydrogen under UV-Visible light. Nanostructured orthorhombic Nb2O5-xNx was synthesized by a simple solid-state combustion reaction (SSCR). The nanostructural features of Nb2O5-xNx were examined by FESEM and HRTEM, which showed they had a porous chain-like structure, with chains interlocked with each other and with nanoparticles sized less than 10 nm...
October 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Huitao Fan, Xiaojing Xing, Yuhan Yang, Bo Li, Congcong Wang, Dongfang Qiu
Cobalt ferrite nanoparticles loaded on multiwalled carbon nanotube (MWCNT) magnetic hybrids have been demonstrated to be promising magnetic resonance imaging contrast agents and drug carriers. However, the hydrophobic, less biocompatible characteristics and low loading capacity for the drug hamper their wide biological applications. To solve the above problem, an alternative strategy is to coat the MWCNTs@CoFe2O4 nanoparticles with a mesoporous silica (mSiO2) shell. Herein, the reasonable fabrication process results in successful coating mSiO2 on the as-obtained MWCNTs@CoFe2O4 nanoparticles, forming well-defined core-shell-structured MWCNTs@CoFe2O4@mSiO2 nanocomposites...
October 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Nan Zhang, Ronghui Wang, Junnian Hao, Yang Yang, Hongmi Zou, Zhigang Wang
High-intensity focused ultrasound (HIFU) is a promising and noninvasive treatment for solid tumors, which has been explored for potential clinical applications. However, the clinical applications of HIFU for large and deep tumors such as hepatocellular carcinoma (HCC) are severely limited by unsatisfactory imaging guidance, long therapeutic times, and damage to normal tissue around the tumor due to the high power applied. In this study, we developed doxorubicin/perfluorohexane-encapsulated hollow mesoporous Prussian blue nanoparticles (HMPBs-DOX/PFH) as theranostic agents, which can effectively guide HIFU therapy and enhance its therapeutic effects in combination with chemotherapy, by decreasing the cavitation threshold...
2017: International Journal of Nanomedicine
Nicolas Crespo-Monteiro, Anthony Cazier, Francis Vocanson, Yaya Lefkir, Stéphanie Reynaud, Jean-Yves Michalon, Thomas Kämpfe, Nathalie Destouches, Yves Jourlin
The microstructuring of the distribution of silver nanoparticles (NPs) in mesoporous titania films loaded with silver salts, using two-beam interference lithography leading to 1 Dimension (1D) grating, induces variations in the photocatalytic efficiency. The influence of the structuration was tested on the degradation of methyl blue (MB) under ultraviolet (UV) and visible illumination, giving rise to a significant improvement of the photocatalytic efficiency. The periodic distribution of the NPs was characterized by transmission electron microscopy (TEM), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and scanning electron microscopy (SEM)...
October 17, 2017: Nanomaterials
Palanisamy Kannan, Thandavarayan Maiyalagan, Enrico Marsili, Srabanti Ghosh, Longhua Guo, Youju Huang, Jahangir Ahmed Rather, Dharmaraj Thiruppathi, Joanna Niedziolka-Jönsson, Martin Jönsson-Niedziolka
The demand for electrochemical sensors with high sensitivity and reliability, fast response, and excellent selectivity has stimulated intensive research on developing highly active nanomaterials. In this work, freestanding 3D/Co3O4 thorn-like and wire-like (nanowires) nanostructures are directly grown on a flexible carbon fiber paper (CFP) substrate by a single-step hydrothermal process without using surfactants or templates. The 3D/Co3O4 thorn-like nanostructures show higher electrochemical activity than wire-like because of their high conductivity, large specific surface areas, and mesopores on their surface...
October 17, 2017: Analyst
Jingjing Xu, Shiyao Lu, Xu Chen, Jianan Wang, Bo Zhang, Xinyu Zhang, Chunhui Xiao, Shujiang Ding
Investigating low-cost and highly active electrocatalysts for oxygen reduction reactions (ORR) is of crucial importance for energy conversion and storage devices. Herein, we design and prepare mesoporous carbon supported nitrogen-doped carbon by pyrolysis of polyaniline coated on CMK-3. This non-precious metal electrocatalyst exhibits excellent performance towards oxygen reduction reaction (ORR) in alkaline media. The optimized nitrogen-doped mesoporous electrocatalyst show an onset potential (Eonset) of 0...
October 17, 2017: Nanotechnology
Ying Wang, Yating Zhao, Yu Cui, Qinfu Zhao, Qiang Zhang, Sara Musetti, Karina A Kinghorn, Siling Wang
Oral administration of nanocarriers remains a significant challenge in the pharmaceutical sciences. The nanocarriers must efficiently overcome multiple gastrointestinal barriers including the harsh gastrointestinal environment, the mucosal layer, and the epithelium. Neutral hydrophilic surfaces are reportedly necessary for mucus permeation, but hydrophobic and cationic surfaces are important for efficient epithelial absorption. To accommodate these conflicting surface property requirements, we developed a strategy to modify nanocarrier surfaces with cationic cell-penetrating peptides (CPP) concealed by a hydrophilic succinylated casein (SCN) layer...
October 13, 2017: Acta Biomaterialia
Niuzi Xue, Qinyi Zhang, Shunping Zhang, Pan Zong, Feng Yang
It is important to improve the sensitivities and selectivities of metal oxide semiconductor (MOS) gas sensors when they are used to monitor the state of hydrogen in aerospace industry and electronic field. In this paper, the ordered mesoporous SnO₂ (m-SnO₂) powders were prepared by sol-gel method, and the morphology and structure were characterized by X-ray diffraction analysis (XRD), transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET). The gas sensors were fabricated using m-SnO₂ as the modified layers on the surface of commercial SnO₂ (c-SnO₂) by screen printing technology, and tested for gas sensing towards ethanol, benzene and hydrogen with operating temperatures ranging from 200 °C to 400 °C...
October 14, 2017: Sensors
Panpan Gai, Chengcheng Gu, Haiyin Li, Xinzhi Sun, Feng Li
A new label-free and enzyme-free ratiometric homogeneous electrochemical microRNA biosensing platform was constructed via target-triggered Ru(III) release and redox recycling. To design the effective ratiometric dual-signal strategy, [Ru(NH3)6](3+) (Ru(III)) as one of electroactive probe was ingeniously entrapped in the pores of positively charged mesoporous silica nanoparticle (PMSN), as well as another electroactive probe [Fe(CN)6](3-) (Fe(III)) was selected to facilitate Ru(III) redox reclycling due to their distinctly separated reduction potential and different redox properties...
October 16, 2017: Analytical Chemistry
Asma Nasrullah, A H Bhat, Abdul Naeem, Mohamed Hasnain Isa, Mohammed Danish
High surface area mesoporous activated carbon-alginate (AC-alginate) beads were successfully synthesised by entrapping activated carbon powder derived from Mangosteen fruit peel into calcium-alginate beads for methylene blue (MB) removal from aqueous solution. The structure and surface characteristics of AC-alginate beads were analysed using Fourier transform infra-red (FTIR) spectroscopy, scanning electron microscopy (SEM) and surface area analysis (SBET), while thermal properties were tested using thermogravimetric analysis (TGA)...
October 12, 2017: International Journal of Biological Macromolecules
Mohammad Azad, Jacqueline Moreno, Rajesh Davé
A promising approach to increase the aqueous solubility, hence the bioavailability, of poorly water-soluble drugs is to convert them into their amorphous state through impregnation into mesoporous silica. Unfortunately, mesoporous silica is not yet available in bulk quantities due to high manufacturing costs. In this work, feasibility of using a commercially available cost-effective mesoporous fine grade Neusilin(®) UFL2 to prepare amorphous drug composites of two model poorly soluble drugs, Fenofibrate and Itraconazole, is established...
October 12, 2017: Journal of Pharmaceutical Sciences
Jingling Yang, Wenjun Xu, Chun He, Yajing Huang, Zaili Zhang, Yunchen Wang, Lingling Hu, Dehua Xia, Dong Shu
Hierarchical porous sludge-derived activated carbon coated on macroporous silicon carbide (SiC) foams substrate has been facilely fabricated via a simple one-step strategy by utilizing sludge as carbon source, and jointly using zinc chloride and hexadecanol as pore forming agents. The sludge-derived carbon has been confirmed to be hierarchical macro-meso-microporous structure based on detailed characterization by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and nitrogen adsorption-desorption measurement...
October 2, 2017: Journal of Hazardous Materials
Yangang Wang, Xia Bai, Fei Wang, Shifei Kang, Chaochuang Yin, Xi Li
Chromium doped mesoporous CeO2 catalysts were synthesized via a simple nanocasting route by using silica SBA-15 as the template and metal nitrates as precursors. The effect of Cr doping concentration (5%, 10%, 15% and 20% of the initial Cr/(Cr+Ce) molar percentage) on the structures of these catalysts and their photocatalytic performances in reduction of CO2 with H2O were investigated. The results indicated that the introduction of Cr species could effectively extend the spectral response range from UV to visible light region (400-700nm) and improve the electronic conductivity for the mesoporous CeO2 catalysts which exhibited an enhanced photocatalytic activity in the reduction of CO2 with H2O when compared with the non-doped counterpart...
October 5, 2017: Journal of Hazardous Materials
Asgar Ebadollahi, Jalal Jalali Sendi, Alireza Aliakbar
Inspite of well-established potentiality of plant essential oils as biopesticides, their environmentally low persistence is considered as a hindering obstacle for its commercialization. In the present study, chemical composition and toxicity of essential oils isolated from leaves of Thymus eriocalyx and Thymus kotschyanus were evaluated against two-spotted spider mite, Tetranychus urticae. The chemicals present in the crude oil were found to be thymol (28.83%), oleic acid (11.51%), palmitic acid (8.60%), borneol (5...
September 27, 2017: Journal of Economic Entomology
Qiyun Tang, Paula C Angelomé, Galo J A A Soler-Illia, Marcus Müller
Ordered mesostructured TiO2 thin films are employed in diverse applications ranging from catalysis and sensing, to photovoltaic and lithium-ion batteries. Experimentally these mesostructured thin films are fabricated via a sol-gel process coupled with evaporation-induced self-assembly of a supramolecular template, where the concentration of hydrogen chloride (HCl) and water play vital roles. We employ a soft, coarse-grained model of the amphiphilic template Brij58 and spherical particles, representing titanium-oxo clusters, to study the role of HCl and water in the formation of mesostructured TiO2 thin films...
October 13, 2017: Physical Chemistry Chemical Physics: PCCP
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