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Mesoporous silica

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https://www.readbyqxmd.com/read/28345106/phenylamine-functionalized-mesoporous-silica-supported-pdag-nanoparticles-a-dual-heterogeneous-catalyst-for-formic-acid-co2-mediated-chemical-hydrogen-delivery-storage
#1
Kohsuke Mori, Shinya Masuda, Hiromasa Tanaka, Kazunari Yoshizawa, Michel Che, Hiromi Yamashita
A PdAg-based nanoparticle catalyst supported on the mesoporous silica material, SBA-15, modified with a weakly basic phenylamine functional group has been developed as a dual heterogeneous catalyst for the H2 delivery and H2 storage reactions mediated by formic acid and carbon dioxide.
March 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28343131/synthesis-of-mesoporous-poly-melamine-formaldehyde-particles-by-inverse-emulsion-polymerization
#2
Dana Schwarz, Jens Weber
Mesoporous poly(melamine-formaldehyde) (MF) particles with surface areas of up to 200m(2)g(-1) were synthesized by an inverse emulsion polymerization using dodecane and Span80® as continuous phase. The finer details of the shape control (using emulsion techniques) and the porosity control (using silica nanoparticles as hard-template) are discussed. The impact of phase-separation processes on the observable porosity of the 20-200µm sized spherical particles is analysed by gas sorption methods and electron microscopy...
March 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28335979/microfluidic-immunosensor-based-on-mesoporous-silica-platform-and-cmk-3-poly-acrylamide-co-methacrylate-of-dihydrolipoic-acid-modified-gold-electrode-for-cancer-biomarker-detection
#3
Matías Regiart, Martin A Fernández-Baldo, Jhonny Villarroel-Rocha, Germán A Messina, Franco A Bertolino, Karim Sapag, Aaron T Timperman, Julio Raba
We report a hybrid glass-poly (dimethylsiloxane) microfluidic immunosensor for epidermal growth factor receptor (EGFR) determination, based on the covalent immobilization of anti-EGFR antibody (anti-EGFR) on amino-functionalized mesoporous silica (AMS) retained in the central channel of a microfluidic device. The synthetized AMS was characterized by N2 adsorption-desorption isotherm, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and infrared spectroscopy. The cancer biomarker was quantified in human serum samples by a direct sandwich immunoassay measuring through a horseradish peroxidase-conjugated anti-EGFR...
April 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28335320/cellular-interactions-and-formation-of-an-epithelial-nanocoating-like-barrier-with-mesoporous-silica-nanoparticles
#4
Xuan Li, Ka Yan Pang, Tsz Wing Ng, Ping Chung Leung, Cheng Fei Zhang, Ken Cham-Fai Leung, Lijian Jin
Oral mucosa as the front-line barrier in the mouth is constantly exposed to a complex microenvironment with multitudinous microbes. In this study, the interactions of mesoporous silica nanoparticles (MSNs) with primary human gingival epithelial cells were analyzed for up to 72 h, and their diffusion capacity in the reconstructed human gingival epithelia (RHGE) and porcine ear skin models was further assessed at 24 h. It was found that the synthesized fluorescent mesoporous silica nanoparticles (RITC-NPs) with low cytotoxicity could be uptaken, degraded, and/or excreted by the human gingival epithelial cells...
October 27, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335254/quaternized-chitosan-capped-mesoporous-silica-nanoparticles-as-nanocarriers-for-controlled-pesticide-release
#5
Lidong Cao, Huirong Zhang, Chong Cao, Jiakun Zhang, Fengmin Li, Qiliang Huang
Nanotechnology-based pesticide formulations would ensure effective utilization of agricultural inputs. In the present work, mesoporous silica nanoparticles (MSNs) with particle diameters of ~110 nm and pore sizes of ~3.7 nm were synthesized via a liquid crystal templating mechanism. A water-soluble chitosan (CS) derivative (N-(2-hydroxyl)propyl-3-trimethyl ammonium CS chloride, HTCC) was successfully capped on the surface of pyraclostrobin-loaded MSNs. The physicochemical and structural analyses showed that the electrostatic interactions and hydrogen bonding were the major forces responsible for the formation of HTCC-capped MSNs...
June 28, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334479/signal-induced-release-of-guests-from-a-photolatent-metal-phenolic-supramolecular-cage-and-its-hybrid-assemblies
#6
Chiyoung Park, Beom Joo Yang, Ki Beom Jeong, Chae Bin Kim, Seunghyun Lee, Bon-Cheol Ku
The coordination chemistry of plant polyphenols and metal ions can be used for coating various substrates and for creating modular superstructures. We herein explored this chemistry for the controlled release of guests from mesoporous silica nanoparticles (MSNs). The selective adsorption of tannic acids (TAs) on MSN silica walls opens the MSN mesoporous channels without disturbing mass transport. The channel may be closed by the coordination of TA with Cu(II) ions. Upon exposure to light, photolysis of Trojan horse guests (photoacid generators, PAGs) leads to acid generation, which enables the release of payloads by decomposing the outer coordination shell consisting of TA and Cu(II) ...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28332669/multiple-imaging-and-excellent-anticancer-efficiency-of-an-upconverting-nanocarrier-mediated-by-single-near-infrared-light
#7
Yan Wang, Guixin Yang, Yanli Wang, Yanping Zhao, Haizhi Jiang, Yuyan Han, Piaoping Yang
It is difficult to meet the requirements of clinical diagnosis through a single imaging technique. Similarly, satisfactory therapy efficacy is also hard to achieve by a single therapeutic modality. It is therefore highly desirable and interesting to simultaneously achieve multimodal imaging and therapies in one single structure. In this study, we developed a core-shell-satellite NaGdF4:Yb,Er,Mn,Co@mSiO2-CuS structure using up-conversion luminescent (UCL) NaGdF4:Yb,Er,Mn,Co as the core, mesoporous silica as the layer, and the photoactive CuS nanoparticles as the satellites...
March 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28332343/bifunctional-cage-type-cubic-mesoporous-silica-sba-1-nanoparticles-for-selective-adsorption-of-dyes
#8
Chien-Hua Lin, Juti Rani Deka, Cheng-En Wu, Cheng-Hsun Tsai, Diganta Saikia, Yung-Chin Yang, Hsien-Ming Kao
Bifunctional SBA-1 mesoporous silica nanoparticles (MSNs) with carboxylic acid and amino groups (denoted as CNS-10-10) are successfully synthesized, characterized and employed as adsorbents for dye removal. The adsorbent CNS-10-10 shows high affinity towards cationic and anionic dyes in a wide pH range, and exhibits selective dye removal of a two dye mixture system of cationic methylene blue and anionic eosin Y. By changing the medium pH, the selectivity of adsorption behavior can be easily modulated. For comparison purposes, the counterparts, i...
March 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28328301/comparative-dna-isolation-behaviours-of-silica-and-polymer-based-sorbents-in-batch-fashion-monodisperse-silica-microspheres-with-bimodal-pore-size-distribution-as-a-new-sorbent-for-dna-isolation
#9
Gülçin Günal, Çiğdem Kip, S Eda Öğüt, Hasan İlhan, Güneş Kibar, Ali Tuncel
Monodisperse silica microspheres with bimodal pore-size distribution were proposed as a high performance sorbent for DNA isolation in batch fashion under equilibrium conditions. The proposed sorbent including both macroporous and mesoporous compartments was synthesized 5.1 μm in-size, by a "staged shape templated hydrolysis and condensation method". Hydrophilic polymer based sorbents were also obtained in the form of monodisperse-macroporous microspheres ca 5.5 μm in size, with different functionalities, by a developed "multi-stage microsuspension copolymerization" technique...
March 22, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28327716/chemo-photodynamic-combined-gene-therapy-and-dual-modal-cancer-imaging-achieved-by-ph-responsive-alginate-chitosan-multilayer-modified-magnetic-mesoporous-silica-nanocomposites
#10
Hong Yang, Yin Chen, Zhongyuan Chen, Yue Geng, Xiaoxue Xie, Xue Shen, Tingting Li, Shun Li, Chunhui Wu, Yiyao Liu
Multifunctional theranostics have offered some interesting new opportunities for cancer therapy and diagnosis in the last decade. Herein, magnetic mesoporous silica nanoparticles (M-MSNs) were designed and synthesized, then the photosensitizer chlorin e6 (Ce6) and antitumor drug doxorubicin (Dox) were adsorbed onto the M-MSNs. Biocompatible alginate/chitosan polyelectrolyte multilayers (PEM) were assembled on the M-MSNs to achieve a pH-responsive drug delivery system and adsorb P-gp shRNA for reversing the multidrug resistance...
March 22, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28327600/dopamine-functionalized-tannic-acid-templated-mesoporous-silica-nanoparticles-as-a-new-sorbent-for-the-efficient-removal-of-cu-2-from-aqueous-solution
#11
Junkai Gao, Hao Lei, Zhi Han, Qian Shi, Yan Chen, Yanjun Jiang
A simple, environmentally friendly and cost-effective nonsurfactant template method was used to synthesize tannic-acid-templated mesoporous silica nanoparticles (TMSNs), and then dopamine functionalized TMSNs (Dop-TMSNs) which was synthesized by a facile and biomimetic coating strategy, was developed as a new sorbent for the removal of Cu(2+) from aqueous solution. The Dop-TMSNs were thoroughly characterized by SEM, TEM, BET, FT-IR and TGA, and the effects of contact time, initial pH, K(+) and Na(+) concentrations, co-existing polyvalent metal ions and adsorption-desorption cycle times on the sorption capacity of Dop-TMSNs were studied...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28326238/fiber-optic-sensors-based-on-hybrid-phenyl-silica-xerogel-films-to-detect-n-hexane-determination-of-the-isosteric-enthalpy-of-adsorption
#12
Jesús C Echeverría, Ignacio Calleja, Paula Moriones, Julián J Garrido
We investigated the response of three fiber optic sensing elements prepared at pH 10 from phenyltriethoxysilane (PhTEOS) and tetraethylsilane (TEOS) mixtures with 30, 40, and 50% PhTEOS in the silicon precursor mixture. The sensing elements are referred to as Ph30, Ph40 and Ph50, respectively. The films were synthesized by the sol-gel method and affixed to the end of optical fibers by the dip-coating technique. Fourier transform infrared spectroscopy, N2 adsorption-desorption at 77 K and X-ray diffraction analysis were used to characterize the xerogels...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28325685/a-positive-feedback-strategy-for-enhanced-chemotherapy-based-on-ros-triggered-self-accelerating-drug-release-nanosystem
#13
Jing-Jing Hu, Qi Lei, Meng-Yun Peng, Di-Wei Zheng, Yi-Xuan Chen, Xian-Zheng Zhang
Here, a positive feedback strategy was utilized to amplify the concentration of intracellular reactive oxygen species (ROS) and a ROS-triggered self-accelerating drug release nanosystem (defined as T/D@RSMSNs) was demonstrated for enhanced tumor chemotherapy. The mesoporous silica nanoparticles (MSNs) based nanocarriers were gated by β-cyclodextrin (β-CD) through the ROS-cleavable thioketal (TK) linker to encapsulate the anticancer drug doxorubicin hydrochloride (DOX) and ROS producing agent α-tocopheryl succinate (α-TOS), whose surface was further anchored with adamantane conjugated poly(ethylene glycol) chain (AD-PEG) via host-guest interaction...
March 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28320205/highly-emissive-dye-sensitized-upconversion-nanostructure-for-dual-photosensitizer-photodynamic-therapy-and-bioimaging
#14
Jiating Xu, Piaoping Yang, MIngdi Sun, Huiting Bi, Bin Liu, Dan Yang, Shili Gai, Fei He, Jun Lin
Rare-earth-based upconversion nanotechnology has recently shown great promise for photodynamic therapy (PDT). However, the NIR-induced PDT is greatly restricted by the overheating issues on normal bodies and low yields of reactive oxygen species (ROS, 1O2). Here, IR-808 sensitized upconversion nanoparticles (NaGdF4:Yb,Er@NaGdF4:Nd,Yb) were combined with mesoporous silica, which has Ce6 (red-light-excited photosensitizer) and MC540 (green-light-excited photosensitizer) loaded inside through covalent bond and electrostatic interaction, respectively...
March 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28319867/phototherapeutic-spectrum-expansion-through-synergistic-effect-of-mesoporous-silica-trio-nanohybrids-against-antibiotic-resistant-gram-negative-bacterium
#15
Yaswanth Kuthati, Ranjith Kumar Kankala, Prabhakar Busa, Shi-Xiang Lin, Jin-Pei Deng, Chung-Yuan Mou, Chia-Hung Lee
The extensive impact of antibiotic resistance has led to the exploration of new anti-bacterial modalities. We designed copper impregnated mesoporous silica nanoparticles (Cu-MSN) with immobilizing silver nanoparticles (SNPs) to apply photodynamic inactivation (PDI) of antibiotic-resistant E. coli. SNPs were decorated over the Cu-MSN surfaces by coordination of silver ions on diamine-functionalized Cu-MSN and further reduced to silver nanoparticles with formalin. We demonstrate that silver is capable of sensitizing the gram-negative bacteria E...
March 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28319667/a-generalized-method-for-the-synthesis-of-ligand-free-m-sio2-m-ag-au-pd-pt-yolk-shell-nanoparticles
#16
Firdoz Shaik, Weiqing Zhang, Wenxin Niu
A universal method is reported for the synthesis of ligand free noble metal M@SiO2 (M=Ag, Au, Pd, Pt) yolk-shell nanoparticles (YSNs). Mesoporous hollow silica shells (mHSS) are used as smart nanoreactors for the synthesis of noble metal yolk-shell nanoparticles. The nanocavity of a mHSS and anionic metal ions play a critical role in formation of yolk-shell nanoparticles. The synthesis mechanism can be tuned by simply varying the pH of the noble metal precursor aqueous solution. A critical pH ≥ 4 is required for the formation of YSNs...
March 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28318490/emulsion-based-synthesis-of-porous-silica
#17
REVIEW
Hanna Gustafsson, Krister Holmberg
We review the use of various types of emulsions as media for synthesis of porous silica particles. The use of high internal phase emulsions, i.e. emulsions with a high ratio of dispersed to continuous phase, is an approach that has attracted considerable attention. Polymerization of the continuous phase followed by removal of the dispersed phase leads to a material with an even distribution of pores if the emulsion droplets are uniform in size. Another route is to use particle stabilized emulsions as template...
March 11, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28304045/synthesis-of-yolk-shell-mesoporous-silica-nanoparticles-via-a-facile-one-pot-approach
#18
Jing-Chuan Song, Fei-Fei Xue, Xing-Xing Zhang, Zhong-Yuan Lu, Zhao-Yan Sun
A facile one-pot method is proposed for the fabrication of yolk-shell mesoporous silica nanoparticles with high special surface area. The particle size can be well controlled by moderately tuning some experimental parameters.
March 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28301952/correction-to-karimzadeh-mahmonir-rashidi-ladan-ganji-fariba-mesoporous-silica-nanoparticles-for-efficient-rivastigmine-hydrogen-tartrate-delivery-into-sy5y-cells
#19
(no author information available yet)
No abstract text is available yet for this article.
March 16, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28301164/effect-of-meso-vs-macro-size-of-hierarchical-porous-silica-on-the-adsorption-and-activity-of-immobilized-%C3%AE-galactosidase
#20
Ileana-Alexandra Pavel, Sofia F Prazeres, Gemma Montalvo, Carmen Garcı A Ruiz, Vincent Nicolas, Alain Celzard, François Dehez, Laetitia Canabady-Rochelle, Nadia Canilho, Andreea Pasc
β-Galactosidase (β-Gal) is one of the most important enzymes used in milk processing for improving their nutritional quality and digestibility. Herein, β-Gal has been entrapped into a meso-macroporous material (average pore size 9 and 200 nm, respectively) prepared by a sol-gel method from a silica precursor and a dispersion of solid lipid nanoparticles in a micelle phase. The physisorption of the enzyme depends on the concentration of the feed solution and on the pore size of the support. The enzyme is preferentially adsorbed either in mesopores or in macropores, depending on its initial concentration...
March 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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