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Mesoporous silica

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https://www.readbyqxmd.com/read/28107616/superhydrophilic-antireflective-periodic-mesoporous-organosilica-coating-on-flexible-polyimide-substrate-with-strong-abrasion-resistance
#1
Jing Wang, Cong Zhang, Chunming Yang, Ce Zhang, Mengchao Wang, Jing Zhang, Yao Xu
Superhydrophilic antireflective periodic mesoporous organosilica (PMO) coating was prepared on flexible polyimide substrate via solvent-evaporation-induced self-assembly (SEISA) method, in which tetraethoxysilane (TEOS) and a special bridged silsesquioxane were used as reactants. The bridged silsesquioxane, EG-BSQ, was synthesized through the stoichiometric reaction between 3-glycidoxyporpyltrimethoxysilane (GPTMS) and ethylene diamine (EDA) at 60 (○)C with no catalyst. Under the influence of surfactant, TEOS and EG-BSQ co-condensed and enclosed the ordered mesporous in the coating...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106533/defect-structures-in-frank-kasper-type-square-triangle-tiling-of-multimodal-cage-type-mesoporous-silicas
#2
Yasuhiro Sakamoto
Multimodal cage-type mesoporous silicas (MCMSs) with Frank���Kasper type square���triangle tiling show a unique defect structure, so-called three-fold symmetric hexagons, or shields, which are caused by phason fluctuations in dodecagonal quasicrystals. We observed and characterized three types of configurations inside shields in both quasiperiodic and periodic 3<sup>2</sup>.4.3.4 tiling of MCMSs by transmission electron microscopy (TEM). The high-resolution TEM images of the shields were well explained by polyhedral models, which are the constituents of the Frank���Kasper type tetrahedrally close-packed structures of MCMSs...
January 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28105473/recent-applications-of-the-combination-of-mesoporous-silica-nanoparticles-with-nucleic-acids-development-of-bioresponsive-devices-carriers-and-sensors
#3
REVIEW
Rafael R Castillo, Alejandro Baeza, María Vallet-Regí
The discovery and control of the biological roles mediated by nucleic acids have turned them into a powerful tool for the development of advanced biotechnological materials. Such is the importance of these gene-keeping biomacromolecules that even nanomaterials have succumbed to the claimed benefits of DNA and RNA. Currently, there could be found in the literature a practically intractable number of examples reporting the use of combination of nanoparticles with nucleic acids, so boundaries are demanded. Following this premise, this review will only cover the most recent and powerful strategies developed to exploit the possibilities of nucleic acids as biotechnological materials when in combination with mesoporous silica nanoparticles...
January 20, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28100048/unanticipated-stickiness-of-%C3%AE-pinene
#4
Hilary M Chase, Junming Ho, Mary Alice Upshur, Regan J Thomson, Victor S Batista, Franz M Geiger
Hilary M. Chase1#, Junming Ho2#, Mary Alice Upshur1, Regan J. Thomson1, Victor S. Batista3, Franz M. Geiger1* 1Department of Chemistry, Northwestern University, Evanston, IL. 60208, United States; 2 Agency for Science, Technology and Research, Institute of High Performance Computing, 1 Fusionopolis Way #16-16 Connexis North, Singapore 138632; 3Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT. 06520, United States # These authors contributed equally to this work. *corresponding author: geigerf@chem...
January 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28099024/surface-interactions-and-confinement-of-methane-a-high-pressure-magic-angle-spinning-nmr-and-computational-chemistry-study
#5
Salim Ok, David W Hoyt, Amity Andersen, Julie Sheets, Susan A Welch, David R Cole, Karl Todd Mueller, Nancy M Washton
Characterization and modeling of the molecular-level behavior of simple hydrocarbon gases, such as methane, in the presence of both nonporous and nano-porous mineral matrices allows for predictive understanding of important processes in engineered and natural systems. In this study, changes in local electromagnetic environments of the carbon atoms in methane under conditions of high pressure (up to 130 bar) and moderate temperature (up to 346 K) were observed with 13C magic-angle spinning (MAS) NMR spectroscopy while the methane gas was mixed with two model solid substrates: a fumed non-porous, 12 nm particle size silica and a mesoporous silica with 200 nm particle size and 4 nm average pore diameter...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28097273/integration-of-multiple-active-sites-on-large-pore-mesoporous-silica-for-enantioselective-tandem-reactions
#6
Xuelin Xia, Jingjing Meng, Hanxin Wu, Tanyu Cheng, Guohua Liu
Facile construction of a multifunctional heterogeneous catalyst through the assembly of Au/carbene and chiral ruthenium/diamine dual complexes in large-pore mesoporous silica was developed. This enables an efficient one-pot hydration-asymmetric transfer hydrogenation enantioselective tandem reaction of haloalkynes, affording chiral halohydrins with up to 99% enantioselectivity. Combined multifunctionalities, such as substrate-promoted silanol-functionality, BF4(-) anion-bonding gold/carbene and covalent-bonding chiral ruthenium/diamine active centers, contributed cooperatively to the catalytic performance...
January 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28093898/effect-of-heat-treatment-on-the-nitrogen-content-and-its-role-on-the-co2-adsorption-capacity-of-highly-ordered-mesoporous-carbon-nitride
#7
Kripal S Lakhi, Dae-Hwan Park, Stalin Joseph, Siddulu N Talapaneni, Ugo Ravon, Khalid Al-Bahily, Ajayan Vinu
Mesoporous carbon nitrides (MCN) with rod shaped morphology and tunable nitrogen contents have been synthesized via calcination free method using ethanol-washed mesoporous SBA-15 as templates at different carbonization temperatures. Carbon tetrachloride (CTC) and ethylenediamine (EDA) were used as the sources of carbon and nitrogen respectively. The resulting MCN materials were characterized with low and high angle power XRD, N2 adsorption, HR-SEM, HR-TEM, CHN elemental analysis, XPS and. XANES techniques. It is observed that the carbonization temperature plays a critical role in controlling not only the crystallinity but also the nitrogen content and the textural parameters of the samples including specific surface area and specific pore volume...
January 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28090036/fabrication-and-functionalization-of-inorganic-materials-using-amphiphilic-molecules
#8
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/28088015/transferrin-gated-mesoporous-silica-nanoparticles-for-redox-responsive-and-targeted-drug-delivery
#9
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/28077760/effective-delivery-of-volatile-biocides-employing-mesoporous-silicates-for-treating-biofilms
#10
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
#11
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
#12
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
#13
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/28074643/ultra-photostable-mesoporous-silica-coated-gap-enhanced-raman-tags-gerts-for-high-speed-bioimaging
#14
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
#15
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/28070074/raman-spectroscopy-of-pharmaceutical-cocrystals-in-nanosized-pores-of-mesoporous-silica
#16
Ryuichi Ohta, Yuko Ueno, Katsuhiro Ajito
The Raman spectroscopy of pharmaceutical cocrystals based on caffeine and oxalic acid in nanosized pores of mesoporous silica has been demonstrated at various molar amounts. The Raman peak shifts of caffeine molecules express the existence of pharmaceutical cocrystals in mesoporous silica. The molar amount dependence of the peak shifts describes that caffeine and oxalic acid cocrystallized on the surface of the nanosized pores and piled up layer by layer. This is the first report that shows the Raman spectroscopy is a powerful tool to observe the synthesis of pharmaceutical cocrystals incorporated in the nanosized pores of mesoporous silica...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28069553/targeting-inflammasome-by-the-inhibition-of-caspase-1-activity-using-capped-mesoporous-silica-nanoparticles
#17
Alba García-Fernández, Guillermo García-Laínez, María Luisa Ferrándiz, Elena Aznar, Félix Sancenón, María José Alcaraz, José Ramón Murguía, María D Marcos, Ramón Martínez-Máñez, Ana M Costero, Mar Orzáez
Acute inflammation is a protective response of the body to harmful stimuli, such as pathogens or damaged cells. However, dysregulated inflammation can cause secondary damage and could thus contribute to the pathophysiology of many diseases. Inflammasomes, the macromolecular complexes responsible for caspase-1 activation, have emerged as key regulators of immune and inflammatory responses. Therefore, modulation of inflammasome activity has become an important therapeutic approach. Here we describe the design of a smart nanodevice that takes advantage of the passive targeting of nanoparticles to macrophages and enhances the therapeutic effect of caspase-1 inhibitor VX-765 in vivo...
January 6, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28069209/superhydrophobic-silica-nanoparticles-as-ultrasound-contrast-agents
#18
Qiaofeng Jin, Chih-Yu Lin, Shih-Tsung Kang, Yuan-Chih Chang, Hairong Zheng, Chia-Min Yang, Chih-Kuang Yeh
Microbubbles have been widely studied as ultrasound contrast agents for diagnosis and as drug/gene carriers for therapy. However, their size and stability (lifetime of 5-12min) limited their applications. The development of stable nanoscale ultrasound contrast agents would therefore benefit both. Generating bubbles persistently in situ would be one of the promising solutions to the problem of short lifetime. We hypothesized that bubbles could be generated in situ by providing stable air nuclei since it has been found that the interfacial nanobubbles on a hydrophobic surface have a much longer lifetime (orders of days)...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068756/hydrophilic-mesoporous-silica-materials-for-highly-specific-enrichment-of-n-linked-glycopeptide
#19
Nianrong Sun, Jiawen Wang, Jizong Yao, Chun-Hui Deng
Hydrophilic interaction liquid chromatography (HILIC) is a significant enrichment strategy in glycoproteomics profiling. In this report, hydrophilic magnetic mesoporous silica materials (Fe3O4@mSiO2-IDA) were designed and synthesized as an outstanding enrichment platform for glycopeptide analysis. By taking advantage of their merits, such as large surface area, excellent hydrophilicity and unbiased affinity toward all types of glycopeptides, the Fe3O4@mSiO2-IDA nanomaterials were successfully applied to capture glycopeptides from complex samples...
January 4, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28067335/dopamine-functionalized-mesoporous-onion-like-silica-as-a-new-matrix-for-immobilization-of-lipase-candida-sp-99-125
#20
Junkai Gao, Yanjun Jiang, Jinshu Lu, Zhi Han, Jiajia Deng, Yan Chen
Dopmine functionalized mesoporous onion-like silica (DPMS) was synthesized via a biomimetic coating, and lipase Candida sp. 99-125 (LCS) was immobilized in DPMS (LCS@DPMS) by physical adsorption in this study. The DPMS was characterized by SEM, TEM, BET and FT-IR, and it was shown that the DPMS had clear multishell structures with large surface area of 419 m(2)/g. The activity, pH stability, thermal stability, storage stability, and reusability of the LCS@DPMS were investigated in detail. The stabilities of LCS@DPMS were improved significantly compared to the free lipase and LCS@MS (LCS immobilized in unfunctionalized mesoporous onion-like silica by physical adsorption)...
January 9, 2017: Scientific Reports
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