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Mesoporous

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https://www.readbyqxmd.com/read/28092819/silver-nanoparticles-supported-over-mesoporous-alumina-as-an-efficient-nanocatalyst-for-n-alkylation-of-hetero-aromatic-amines-and-aromatic-amines-using-alcohols-as-alkylating-agent
#1
Priyanka Paul, Piyali Bhanja, Noor Salam, Usha Mandi, Asim Bhaumik, Seikh Mafiz Alam, Sk Manirul Islam
We have successfully embedded rhombohedral crystallites of silver nanoparticles (Ag-NPs) over mesoporous alumina (Ag@Al2O3) material for the first time. The Ag@Al2O3 has been characterized by powder X-ray diffraction (PXRD), ultra high resolution transmission electron microscopy (UHR-TEM), scanning electron microscopy (SEM), N2 adsorption/desorption isotherm, Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible absorption spectra (UV-Vis), and thermogravimetric analysis (TGA). The PXRD confirms the presence of the rhombohedral phase of Ag nanoparticles...
January 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28091682/all-inorganic-perovskite-quantum-dot-mesoporous-tio2-composite-based-photodetectors-with-enhanced-performance
#2
Lin Zhou, Kai Yu, Fan Yang, Jun Zheng, Yuhua Zuo, Chuanbo Li, Buwen Cheng, Qiming Wang
High-performance all-inorganic perovskite-based metal/semiconductor/metal (MSM) photodetectors with a bilayer composite film of mesoporous TiO2 and CsPbBr3 quantum dots as a photosensitizer were prepared. The photodetectors demonstrated significantly improved on/off ratios of nearly three orders of magnitude compared to those of pure bromine-based perovskite nanocrystal photodetectors with an MSM structure.
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28091561/low-temperature-co-oxidation-over-iron-oxide-nanoparticles-decorating-internal-structures-of-a-mesoporous-alumina
#3
Il Hee Kim, Hyun Ook Seo, Eun Ji Park, Sang Wook Han, Young Dok Kim
Using a chemical vapor deposition method with regulated sample temperatures under ambient pressure conditions, we were able to fully decorate the internal structure of a mesoporous Al2O3 bead (~1 mm in particle diameter) with iron oxide nanoparticles (with a mean lateral size of less than 1 nm). The iron oxide-decorated Al2O3 showed a high CO oxidation reactivity, even at room temperature. Very little deactivation of the CO oxidation activity was observed with increasing reaction time at ~100 °C. Additionally, this catalyst showed high CO oxidation activity, even after annealing at ~900 °C under atmospheric conditions (i...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28090036/fabrication-and-functionalization-of-inorganic-materials-using-amphiphilic-molecules
#4
Hirobumi Shibata
In this review, the synthesis of inorganic materials with various properties using amphiphilic molecules is examined. Amphiphilic molecules are used for the formation of highly ordered mesostructures and the surface modification. Two examples of the mesostructures are crystalline mesoporous titania (TiO2) and the novel visible light responsive mesostuructured titania modified with dye in the pores, which can be fabricated using the molecular self-assemblies of amphiphiles as templates. Surface modification using amphiphilic molecules enables the construction of self-assembled arrays of silica particles and the preparation of a film that can control adsorption/desorption behavior of bovine serum albumin (BSA) by light irradiation...
January 16, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28088144/more-room-for-microphase-separation-an-extended-study-on-binary-liquids-confined-in-sba-15-cylindrical-pores
#5
Ramona Mhanna, Abdel Razzak Abdel Hamid, Sujeet Dutta, Ronan Lefort, Laurence Noirez, Bernhard Frick, Denis Morineau
The confinement of liquid mixtures in porous channels provides new insight into fluid ordering at the nanoscale. In this study, we address a phenomenon of microphase separation, which appears as a novel fascinating confinement effect for fully miscible binary liquids. We investigate the structure of tert-butanol-toluene mixtures confined in the straight and mono-dispersed cylindrical nanochannels of SBA-15 mesoporous silicates (D = 8.3 nm). Small angle neutron scattering experiments on samples with carefully designed isotopic compositions are performed to systematically vary the scattering length density of the different compounds and assess the radial concentration profile of the confined phases...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28088015/transferrin-gated-mesoporous-silica-nanoparticles-for-redox-responsive-and-targeted-drug-delivery
#6
Xiaolu Chen, Hui Sun, Jun Hu, Xia Han, Honglai Liu, Ying Hu
This work reports on a targeted and controlled drug delivery system based on protein decorated mesoporous silica nanoparticles (MSNs). In this system, transferrin (Tf), a naturally existing protein, is grafted on the surfaces of MSNs via redox-cleavable disulfide bonds, serving as both a capping agent and a targeting ligand simultaneously. The uniform particles with ordered mesoporous structures and the successful construction of the Tf/MSN hybrid nanocarriers can be confirmed through combined techniques. It is found that the model anticancer drug doxorubicin (DOX) can be efficiently encapsulated in the MSNs in the absence of glutathione (GSH), and a burst release of DOX is observed when the system is exposed to GSH, indicating good capping efficiency of Tf and redox-responsive release of DOX...
January 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28081490/mesoporous-activated-carbon-prepared-from-naoh-activation-of-rattan-lacosperma-secundiflorum-hydrochar-for-methylene-blue-removal
#7
Md Azharul Islam, M J Ahmed, W A Khanday, M Asif, B H Hameed
Hydrothermal carbonization of biomass wastes presents a promising step in the production of cost-effective activated carbon. In the present work, mesoporous activated carbon (HAC) was prepared by the hydrothermal carbonization of rattan furniture wastes followed by NaOH activation. The textural and morphological characteristics, along with adsorption performance of prepared HAC toward methylene blue (MB) dye, were evaluated. The effects of common adsorption variables on performance resulted in a removal efficiency of 96% for the MB sample at initial concentration of 25mg/L, solution pH of 7, 30°C, and 8h...
January 9, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28081367/ordered-mesoporous-titanium-nitride-as-a-promising-carbon-free-cathode-for-aprotic-lithium-oxygen-batteries
#8
Byung Gon Kim, Changshin Jo, Jaeho Shin, Yeongdong Mun, Jinwoo Lee, Jang Wook Choi
Despite the extraordinary gravimetric energy densities, Li-O2 batteries are still facing a technological challenge; limited round trip efficiency leading to insufficient cycle life. Recently, carbonaceous electrode materials were found to be one of the primary origins of the limited cycle life, as they produce irreversible side products during discharge. A few investigations based on non-carbonaceous materials have demonstrated largely suppressed accumulation of irreversible side products but such studies have focused mainly on the materials themselves rather than delicate morphology control...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28079361/controllable-synthesis-of-smart-multifunctional-nanoscal-metal-organic-framework-for-magnetic-resonance-optical-imaging-and-targeted-drug-delivery
#9
Xuechuan Gao, Manjue Zhai, Weihua Guan, Jingjuan Liu, Zhiliang Liu, Alatangaole Damirin
As a result of their extraordinarily large surfaces and well-defined pores, the design of multifunctional metal-organic framework (MOF) is crucial for drug delivery while has been rarely reported. In this paper, a novel drug delivery system (DDS) based on nanoscale metal-organic framework (MOF) was developed for using in cancer diagnosis and therapy. This MOF based tumour targeting DDS was fabricated by a simple post-synthetic surface modification process. Firstly, magnetic mesoporous nanomaterial Fe-MIL-53-NH2 was devoted for encapsulating the drug and served as a magnetic resonance (MR) contrast agent...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079358/cellulose-nanofibril-aerogels-synergistic-improvement-of-hydrophobicity-strength-and-thermal-stability-via-cross-linking-with-diisocyanate
#10
Feng Jiang, You-Lo Hsieh
A facile gelation cross-linking approach was devised to fabricate meso- and macroporous cellulose nanofibril (CNF) aerogels with multiple improved properties. CNF hydrogels made using a freezing-thawing method with a 94 kPa modulus were solvent exchanged with acetone and then cross-linked with methylene diphenyl diisocyanate (MDI) to produce aerogels with significantly improved compressive properties that follow a power law increment against aerogel density with impressive 1.69, 2.49, and 1.43 scaling factors for Young's modulus, yield stress, and ultimate stress, respectively...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28078340/biocompatible-cus-based-nanoplatforms-for-efficient-photothermal-therapy-and-chemotherapy-in-vivo
#11
Shuwen Peng, Yuanyuan He, Murat Er, Yuanzhi Sheng, Yueqing Gu, Haiyan Chen
Near-infrared (NIR) photothermal therapy (PTT) is a new approach to ablate cancer without affecting normal tissues. A pivotal concern of PPT is to develop photo-responsive agents with high biocompatibility as well as effective photothermal conversion efficiency. Copper sulfide (CuS) nanoparticles prepared are characterized by their low synthesis cost, wide NIR absorption range, good biocompatibility and favorable NIR photothermal conversion efficiency. CuS nanoparticles were then coated with mesoporous silicon dioxide (SiO2) by the Stober method, and further loaded with anticancer drug doxorubicin (DOX)...
January 12, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28077760/effective-delivery-of-volatile-biocides-employing-mesoporous-silicates-for-treating-biofilms
#12
Andrea C Chan, Marimar Bravo Cadena, Helen E Townley, Mark D Fricker, Ian P Thompson
Nanoparticulate delivery of biocides has the potential to decrease levels of exposure to non-target organisms, and miminize long-term exposure that can promote the development of resistance. Silica nanoparticles are an ideal vehicle since they are inert, biocompatible, biodegradable, and thermally and chemically stable. Encapsulation of biocides within nanoparticulates can improve their stability and longevity and maximize the biocidal potential of hydrophobic volatile compounds. Herein, we have shown that the plant secondary metabolites allyl isothiocyanate and cinnamaldehyde demonstrated increased antimicrobial activity against Escherichia coli in planktonic form, when packaged into mesoporous silica nanoparticles...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28076651/controlled-release-of-chlorhexidine-from-a-mesoporous-silica-containing-macroporous-titanium-dental-implant-prevents-microbial-biofilm-formation
#13
K De Cremer, A Braem, E Gerits, K De Brucker, K Vandamme, J A Martens, J Michiels, J Vleugels, B P Cammue, K Thevissen
Roughened surfaces are increasingly being used for dental implant applications as the enlarged contact area improves bone cell anchorage, thereby facilitating osseointegration. However, the additional surface area also entails a higher risk for the development of biofilm associated infections, an etiologic factor for many dental ailments, including peri-implantitis. To overcome this problem, we designed a dental implant composed of a porous titanium-silica (Ti/SiO2) composite material and containing an internal reservoir that can be loaded with antimicrobial compounds...
January 11, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28075601/nitrogen-doped-mesoporous-carbons-as-counter-electrodes-in-quantum-dot-sensitized-solar-cells-with-a-conversion-efficiency-exceeding-12
#14
Shuang Jiao, Jun Du, Zhonglin Du, Donghui Long, Wuyou Jiang, Zhenxiao Pan, Yan Li, Xinhua Zhong
The exploration of catalyst materials for counter electrode (CE) in quantum dot sensitized solar cells (QDSCs) that have both high electrocatalytic activity and low charge transfer resistance is always significant yet challenging. In this work, we report the incorporation of nitrogen heteroatoms into carbon lattices leading to nitrogen doped mesoporous carbon (N-MC) materials with superior catalytic activity when used as CE in Zn-Cu-In-Se QDSCs. A series of N-MC materials with different nitrogen contents were synthesized by colloidal silica nanocasting method...
January 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28075501/a-recoverable-ruthenium-aqua-complex-supported-onto-silica-particles-an-efficient-epoxidation-catalyst
#15
M Isabel Romero, Ingrid Ferrer, Xavier Fontrodona, Anna Roig, Montserrat Rodríguez
The preparation and characterization of new complexes with a phosphonated trpy ligand (trpy-P-Et) and a bidentate pyridylpyrazole (pypz-Me) ligand, with formula [RuII(trpy-P-Et)(pypz-Me)X]n+ (X = Cl, n= 1, 2; X=H2O, n=2, 3) is described, together with the anchoring of 3 onto two types of supports: mesoporous silica particles (SP) and silica coated magnetic particles (MSP). The aqua complex 3 is easily obtained through reflux of 2 in water and displays a bielectronic Ru(IV/II) redox process. It has been anchored onto SP and MSP supports through two different synthetic strategies, yielding the heterogeneous systems SP@3 and MSP@3 that have been fully characterized by IR, UV-vis, SEM, CV and DPV...
January 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28075123/nitrogen-doped-yolk-shell-structured-cose-c-dodecahedra-for-high-performance-sodium-ion-batteries
#16
Yifang Zhang, Anqiang Pan, Lin Ding, Zilong Zhou, Yaping Wang, Shaoyu Niu, Shuquan Liang, Guozhong Cao
In this work, nitrogen-doped, yolk-shell structured CoSe/C mesoporous dodecahedra are successfully prepared by using a self-sacrificial templating strategy. The CoSe nanoparticles are in-situ formed in the metal organic frameworks and the organic species are simultaneously converted into nitrogen-doped carbon in an inert atmosphere. For the yolk-shell structured CoSe/C composite, the carbon framework has relative high graphitizing extent and high nitrogen content (17.65%). Furthermore, the CoSe nanoparticles with size of around 15 nm are coherently confined in the mesoporous carbon framework...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28074847/nitrogen-doped-porous-carbon-monoliths-from-polyacrylonitrile-pan-and-carbon-nanotubes-as-electrodes-for-supercapacitors
#17
Yanqing Wang, Bunshi Fugetsu, Zhipeng Wang, Wei Gong, Ichiro Sakata, Shingo Morimoto, Yoshio Hashimoto, Morinobu Endo, Mildred Dresselhaus, Mauricio Terrones
Nitrogen-doped porous activated carbon monoliths (NDP-ACMs) have long been the most desirable materials for supercapacitors. Unique to the conventional template based Lewis acid/base activation methods, herein, we report on a simple yet practicable novel approach to production of the three-dimensional NDP-ACMs (3D-NDP-ACMs). Polyacrylonitrile (PAN) contained carbon nanotubes (CNTs), being pre-dispersed into a tubular level of dispersions, were used as the starting material and the 3D-NDP-ACMs were obtained via a template-free process...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074643/ultra-photostable-mesoporous-silica-coated-gap-enhanced-raman-tags-gerts-for-high-speed-bioimaging
#18
Yuqing Zhang, Yuanyuan Qiu, Li Lin, Hongchen Gu, Zeyu Xiao, Jian Ye
Surface enhanced Raman scattering (SERS) tags can be utilized as optical labeling nanoprobes similar to fluorescent dyes and quantum dots for bioimaging with additional advantages of the fingerprint vibrational signal as a unique optical code and the ultra-narrow linewidth for multiplexing. However, the development of SERS imaging technique is much less well-established compared to fluorescence imaging mainly due to the speed limitation. An effective strategy to improve the SERS imaging speed and simultaneously maintain the photostability of SERS tags has been never reported to the best of our knowledge...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28073257/protein-containing-lipid-bilayers-intercalated-with-size-matched-mesoporous-silica-thin-films
#19
Simon Isaksson, Erik B Watkins, Kathryn L Browning, Tania Kjellerup Lind, Marité Cárdenas, Kristina Hedfalk, Fredrik Höök, Martin Andersson
Proteins are key components in a multitude of biological processes, of which the functions carried out by transmembrane (membrane-spanning) proteins are especially demanding for investigations. This is because this class of protein needs to be incorporated into a lipid bilayer representing its native environment, and in addition, many experimental conditions also require a solid support for stabilization and analytical purposes. The solid support substrate may, however, limit the protein functionality due to protein-material interactions and a lack of physical space...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28071888/synthesis-and-supercapacitor-application-of-alkynyl-carbon-materials-derived-from-cac2-and-polyhalogenated-hydrocarbons-by-interfacial-mechanochemical-reactions
#20
Yingjie Li, Qingnan Liu, Wenfeng Li, Hong Meng, Ying-Zhou Lu, Chunxi Li
The discovery of new carbon materials and the reactive activation of CaC2 are challenging subjects. In this study, a series of alkynyl carbon materials (ACMs) were synthesized by the interfacial mechanochemical reaction of CaC2 with four typical polyhalogenated hydrocarbons. Their properties and structures were characterized, and their electrochemical performances were examined. The reaction was rapid and efficient arising from the intense mechanical activation of CaC2. The ACMs are micro-mesoporous materials with distinct layered structure, specific graphitization degree, and clear existence of sp-C...
January 10, 2017: ACS Applied Materials & Interfaces
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