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https://www.readbyqxmd.com/read/29240236/evaluation-of-osteoblast-differentiation-and-function-when-cultured-on-mesoporous-bioactive-glass-adsorbed-with-testosterone
#1
Kai Gao, Xiaoyan Wang, Qianqian Liu, Wei Chen, Gan Wang, Dongyi Zhang, Long Liu
Mesoporous bioactive glass (MBG), a kind of porous materials with great osteoconductive and osteoinductive ability, shows promising application in bone tissue engineering due to its high specific surface area, orderly channel structure and large pore volume. Here we reported that the proliferation, differentiation and mineralization were promoted in MC3T3-E1 cells cultured on MBG which adsorbed with testosterone (MBG/T). We found that transcriptional activity of Runx2 which is a critical transcription factor is increased in MC3T3-E1 cells cultured on MBG/T...
December 14, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29236479/pathways-to-mesoporous-resin-carbon-thin-films-with-alternating-gyroid-morphology
#2
Qi Zhang, Fumiaki Matsuoka, Hyo Seon Suh, Peter A Beaucage, Shisheng Xiong, Detlef-M Smilgies, Kwan Wee Tan, Jörg G Werner, Paul F Nealey, Ulrich B Wiesner
Three-dimensional (3D) mesoporous thin films with sub-100 nm periodic lattices are of increasing interest as templates for a number of nanotechnology applications yet are hard to achieve with conventional top-down fabrication methods. Block copolymer self-assembly derived mesoscale structures provide a toolbox for such 3D template formation. In this work, single (alternating) gyroidal and double gyroidal mesoporous thin film structures are achieved via solvent vapor annealing assisted co-assembly of poly(isoprene-block-styrene-block-ethylene oxide) (PI-b-PS-b-PEO, ISO) and resorcinol/phenol formaldehyde resols...
December 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/29236476/oxygen-self-produced-nanoplatform-for-relieving-hypoxia-and-breaking-resistance-to-sonodynamic-treatment-of-pancreatic-cancer
#3
Jie Chen, Honglin Luo, Yan Liu, Wei Zhang, Hongxue Li, Tao Luo, Kun Zhang, Yongxiang Zhao, Junjie Liu
Hypoxia as one characteristic hallmark of solid tumors has been demonstrated to involve in cancer metastasis and progression, induce severe resistance to oxygen-dependent therapies and hamper the transportation of theranostic agents. To address these issues, an oxygen self-produced sonodynamic therapy (SDT) nanoplatform involving modified fluorocarbon (FC) chains-mediated oxygen delivery protocol has been established to realize highly-efficient SDT against hypoxic pancreatic cancer. In this nanoplatform, mesopores and FC chains of FC chains-functionalized hollow mesoporous organosilica nanoparticles (FHMONs) carriers can provide sufficient storage capacity and binding sites for sonosensitizers (IR780) and oxygen, respectively...
December 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/29236474/surface-characteristics-of-microporous-and-mesoporous-carbons-functionalized-with-pentafluorophenyl-groups
#4
Xiaoan Li, Farisa Forouzandeh, Abraham Joseph Kakanat, Fangxia Feng, Dustin William H Banham, Siyu Ye, Daniel Y Kwok, Viola Birss
The in-situ diazonium reduction reaction is a reliable and well known approach for the surface modification of carbon materials for use in a range of applications, including in energy conversion, as chromatography supports, in sensors, etc. Here, this approach was used for the first time with mesoporous colloid-imprinted carbons (CICs), materials that contain ordered monodisperse pores (10-100 nm in diameter) and are inherently highly hydrophilic, using a common microporous carbon (Vulcan carbon (VC)), which is relatively more hydrophobic, for a comparison...
December 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29236016/synthesis-of-mnfe2o4-and-mn3o4-magnetic-nano-composites-with-enhanced-properties-for-adsorption-of-cr-vi-artificial-neural-network-modeling
#5
Kartick Lal Bhowmik, Animesh Debnath, Ranendu Kumar Nath, Biswajit Saha
This study reports adsorptive removal of Cr(VI) by magnetic manganese ferrite and manganese oxide nano-particles (MnF-MO-NPs) composite from aqueous media. The X-ray diffraction pattern of MnF-MO-NPs revealed a polycrystalline nature with nanoscale crystallite size. The prepared adsorbent with high Brunauer-Emmett-Teller specific surface area of 100.62 m2/g and saturation magnetization of 30.12 emu/g exhibited maximum Cr(VI) removal at solution pH 2.0 and was easily separated from water under an external magnetic field...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29235657/electric-double-layer-electrostatics-of-lipid-bilayer-encapsulated-nanoparticles-towards-a-better-understanding-of-protocell-electrostatics
#6
Haoyuan Jing, Siddhartha Das
Lipid-bilayer-encapsulated nanoparticles (LBLENPs) or NP-supported LBL systems, such as protocells (which are lipid bilayer encapsulated mesoporous silica nanoparticles or MSNPs) have received extensive attention for applications like targeted drug and gene deliveries, multimodal diagnostics, characterization of membrane-geometry sensitive molecules, etc. Very often electrostatic-mediated interactions have been hypothesized to play key roles in the functioning of these LBLENPs. Despite that, very little has been done to theoretically quantify the fundamental electric double layer (EDL) electrostatics of such LBLENPs...
December 13, 2017: Electrophoresis
https://www.readbyqxmd.com/read/29233998/pulsed-electroconversion-for-highly-selective-enantiomer-synthesis
#7
Chularat Wattanakit, Thittaya Yutthalekha, Sunpet Asssavapanumat, Veronique Lapeyre, Alexander Kuhn
Asymmetric synthesis of molecules is of crucial importance to obtain pure chiral compounds, which are of primary interest in many areas including medicine, biotechnology, and chemistry. Various methods have been used very successfully to increase the enantiomeric yield of reaction pathways, but there is still room for the development of alternative highly enantioselective reaction concepts, either as a scientific challenge of tremendous fundamental significance, or owing to the increasing demand for enantiopure products, e...
December 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29232648/template-directed-fabrication-of-mil-101-cr-mesoporous-silica-composite-layer-packed-structure-and-enhanced-performance-for-co2-capture
#8
Chong Chen, Nengjie Feng, Qirui Guo, Zhong Li, Xue Li, Jing Ding, Lei Wang, Hui Wan, Guofeng Guan
A novel hybrid material constituted of MIL-101(Cr) and mesoporous silica was successfully assembled through an in-situ hydrothermal method. The MCM-41 with well-ordered mesopores acted as the structure-directing agent, which regulated the growth of MIL-101(Cr) crystals along a certain direction and restricted the expansion of framework. Meanwhile, the hydroxyl groups existed in MCM-41 preferentially coordinated with the Cr3+ centers in MOF, followed by the layer-packed arrangement of MIL-101(Cr) nanocrystals on the surface of matrix...
December 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29232598/high-performance-bimetallic-alloy-catalyst-using-ni-and-n-co-doped-composite-carbon-for-the-oxygen-electro-reduction
#9
Won Suk Jung
In this study, a novel synthesis method for the bimetallic alloy catalyst is reported, which is subsequently used as an oxygen reduction catalyst in polymer electrolyte membrane fuel cells (PEMFCs). The support prepared from the Ni-chelate complex shows a mesoporous structure with a specific surface area of ca. 400 m2 g-1 indicating the suitable support for PEMFC applications. Ethylenediamine is converted to the nitrogen and carbon layers to protect the Ni particles which will diffuse into the Pt lattice at 800 °C...
December 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29232495/encapsulation-of-homogeneous-catalysts-in-mesoporous-materials-using-diffusion-limited-atomic-layer-deposition
#10
Shufang Zhang, Bin Zhang, Haojie Liang, Yequn Liu, Yan Qiao, Yong Qin
The heterogenization of homogeneous metal complex catalysts has attracted great attention. Herein, we report the encapsulation of metal complexes into nanochannels of mesoporous materials by coating metal oxides at/near the pore entrance via diffusion-limited atomic layer deposition (ALD) to produce a "hollow plug". The pore size of the hollow plug is precisely controlled on the sub-nanometer scale by the number of ALD cycles to fit various metal complexes with different molecular sizes. Typically, Co or Ti complexes are successfully encapsulated into the nanochannels of SBA-15, SBA-16 and MCM-41...
December 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29231740/conserved-activity-of-reassociated-homotetrameric-protein-subunits-released-from-mesoporous-silica-nanoparticles
#11
Gauri V Deodhar, Marisa L Adams, Sutapa Joardar, Madhura Joglekar, Malcolm Davidson, Madelyn Mettler, Sydney A Toler, Fiona Davies, Brian G Trewyn
Mesoporous silica nanoparticles (MSN) with enlarged pores were prepared, characterized, and reversibly dissociated subunits of Concanavalin A were entrapped in the mesopores as shown by multiple biochemical and material characterizations. When loaded in the MSN, we demonstrated protein stability from proteases and, upon release, the subunits reassociated into active proteins shown through mannose binding. We have demonstrated a versatile and facile method to load multisubunit proteins into MSN with potential applications in enhancing the delivery of large therapeutic proteins...
December 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29227801/an-efficient-and-cost-effective-tri-functional-electrocatalyst-based-on-cobalt-ferrite-embedded-nitrogen-doped-carbon
#12
Saad M Alshehri, Ameen N Alhabarah, Jahangeer Ahmed, Mu Naushad, Tansir Ahamad
The development of efficient, cost-effective and long-lived electro-catalyst is necessary for the realization of practically viable water-splitting systems. A trifunctional electrocatalyst for water splitting (hydrogen evolution, oxygen reduction and oxygen evolution reaction, HER/ORR/OER) was designed via eco-friendly and facial way. CoFe2O4 nanoparticles embedded in nitrogen doped mesoporous carbon were prepared using chicken egg white/albumin after pyrolysis at different temperatures, 700, 800, 900 and 1000 °C...
December 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29226394/3d-mesoporous-van-der-waals-heterostructures-for-trifunctional-energy-electrocatalysis
#13
Cheng Tang, Ling Zhong, Bingsen Zhang, Hao-Fan Wang, Qiang Zhang
The emergence of van der Waals (vdW) heterostructures of 2D materials has opened new avenues for fundamental scientific research and technological applications. However, the current concepts and strategies of material engineering lack feasibilities to comprehensively regulate the as-obtained extrinsic physicochemical characters together with intrinsic properties and activities for optimal performances. A 3D mesoporous vdW heterostructure of graphene and nitrogen-doped MoS2 via a two-step sequential chemical vapor deposition method is constructed...
December 11, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29224358/extracellular-vs-intracellular-degradation-of-nanostructured-silica-particles
#14
Yupeng Shi, Christophe Helary, Bernard Haye, Thibaud Coradin
Silica nanoparticles appear as promising drug carriers for intracellular delivery. However the mechanisms by which they are degraded within cells remain largely unknown. In this context, we have prepared three types of PEGylated fluorescent silica nanoparticles with various internal structures (core-shell bio-composite, multilayered and hollow mesoporous) and studied their degradation in buffer, in culture medium and in contact with human dermal fibroblasts. All particles were prone to dissolve in solution, leading to an increase of porosity and/or precipitation of new colloids and eventually fragmentation, with a faster rate in medium compared to buffer...
December 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29223891/fallen-leaves-derived-honeycomb-like-porous-carbon-as-a-metal-free-and-low-cost-counter-electrode-for-dye-sensitized-solar-cells-with-excellent-tri-iodide-reduction
#15
Sung Min Cha, Goli Nagaraju, S Chandra Sekhar, L Krishna Bharat, Jae Su Yu
Utilizing carbon-based counter electrodes (CEs) in dye-sensitized solar cells (DSSCs) have received much attention in recent times, owing to their low cost, good electrochemical activity, natural abundance and eco-friendly nature. Herein, we have facilely prepared quince leaves derived porous carbon (QLPC) using fallen quince leaves (QLs) and it was used as a cost-effective CE for the fabrication of DSSCs. By means of alkali treatment and pyrolysis process (at different temperatures of 700, 800 and 900 °C), the QLs powder undergoes chemical activation and carbonization, which results in a honeycomb-like QLPC with abundant micro/mesopores and large surface area...
December 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29223116/effect-of-pre-pyrolysis-mode-on-simultaneous-introduction-of-nitrogen-oxygen-containing-functional-groups-into-the-structure-of-bagasse-based-mesoporous-carbon-and-its-influence-on-cu-ii-adsorption
#16
Zeqing Wan, Kunquan Li
A convenient effective microwave pre-pyrolysis treatment to synthesize biomass-based mesoporous carbon with higher nitrogen/oxygen-chelating adsorption for Cu(II) is reported here, in which phosphoric acid impregnated bagasse was used as a microwave absorber and porogen. For comparison, conventional electric-heating pyrolyzed carbon was prepared and doped with nitrogen/oxygen groups. Nitrogen adsorption, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS) and batch adsorption were employed to investigate the effects of the two pre-pyrolysis modes on the sample physicochemical and Cu(II) adsorptive properties...
December 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29220688/effects-of-surface-modification-and-size-on-oral-drug-delivery-of-mesoporous-silica-formulation
#17
Ying Wang, Yu Cui, Yating Zhao, Qinfu Zhao, Bing He, Qiang Zhang, Siling Wang
The surface chemistry and size of nanoparticles can greatly impact their interaction with biological pathways and alter efficacy. However, the interplay between surface modification and particle size has not been well investigated especially for oral delivery. It is necessary to maximize the bioavailability of loading therapeutics. Here, we prepared different sized mesoporous silica nanoparticles (100-500 nm) and conjugated them with polyethylenimine-coated carbondots (PCD) for effective transepithelial absorption...
November 22, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29220049/unprecedented-nh2-mil-101-al-n-bu4nbr-system-as-solvent-free-heterogeneous-catalyst-for-efficient-synthesis-of-cyclic-carbonates-via-co2-cycloaddition
#18
S Senthilkumar, Minaxi S Maru, R S Somani, H C Bajaj, Subhadip Neogi
Amine-functionalised framework NH2-MIL-101(Al) was synthesized using a solvothermal and microwave method and characterized by PXRD, FT-IR, TGA, SEM-EDX, and BET surface area analysis. The desolvated framework, in the presence of co-catalyst tetrabutylammonium bromide (TBAB), acted as an excellent heterogeneous catalyst for the solvent-free cycloaddition of carbon dioxide (CO2) with epoxides, affording five-membered cyclic carbonates. Using styrene oxide, the NH2-MIL-101(Al)/TBAB system showed more than 99% conversion, affording 96% yield and 99% selectivity with a turn over frequency of 23...
December 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29219325/role-of-drug-adsorption-onto-the-silica-surface-in-drug-release-from-mesoporous-silica-systems
#19
Carol A McCarthy, Robert J Ahern, Ken J Devine, Abina M Crean
Factors contributing to incomplete drug release from a number of mesoporous silica formulations are not well understood. This study aims to address this gap in knowledge by exploring the role of drug adsorption onto silica substrates during the drug release process in dissolution media. Adsorption isotherms were generated to understand drug adsorption behaviour onto the silica surface. Two silica materials were selected (SBA-15 (mesoporous) and Aerosil®200 (non-porous)) to investigate the influence of porous architecture on the adsorption/dissolution processes...
December 8, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29215875/a-nanopore-lithography-strategy-towards-hierarchically-micro-mesoporous-carbon-from-zif-8-graphene-oxide-hybrids-for-electrochemical-energy-storage
#20
Francisco Julian Martin-Jimeno, Fabian Suárez-García, Juan Ignacio Paredes, Marina Enterria, Manuel Fernando R Pereira, José Inácio Martins, José L Figueiredo, Amelia Martinez-Alonso, Juan Manuel D Tascon
Porous carbons derived from metal-organic frameworks (MOFs) are promising materials towards a number of energy- and environment-related applications, but their almost exclusively microporous texture can be an obstacle to their performance in practical uses. Here, we introduce a novel strategy for the generation of very uniform mesoporosity in a prototypical MOF, namely the zeolitic imidazolate framework-8 (ZIF-8). The process, which is referred to as "nanopore lithography", makes use of graphene oxide (GO) nanosheets enclosing ZIF-8 particles as masks or templates for the transfer of mesoporous texture to the latter...
December 7, 2017: ACS Applied Materials & Interfaces
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