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Mesoporous silica

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https://www.readbyqxmd.com/read/28820251/aluminum-doped-mcm-41-nanoparticles-as-platforms-for-the-dual-encapsulation-of-a-co-releasing-molecule-and-cisplatin
#1
Francisco J Carmona, Ignacio Jiménez-Amezcua, Sara Rojas, Carlos C Romão, Jorge A R Navarro, Carmen R Maldonado, Elisa Barea
Mesoporous silica Al-MCM-41 nanoparticles have been used, for the first time, as vehicles for the single and dual encapsulation of the cationic CO-releasing molecule (CORM) [Mn(1,4,7-triazacyclononane)(CO)3](+) (ALF472(+)) and the well-known antineoplastic drug, cis-[PtCl2(NH3)2] (cisplatin). Thus, two new hybrid materials, namely, ALF472@Al-MCM-41 and ALF472-cisplatin@Al-MCM-41, have been isolated and fully characterized. The results reveal that the presence of CORM molecules enhances cisplatin loading 3-fold, yielding a cargo of 0...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28818782/mesoporous-silica-nanoparticles-msns-based-organic-inorganic-hybrid-nanocarriers-loading-5-fluorouracil-for-the-treatment-of-colon-cancer-with-improved-anticancer-efficacy
#2
Gang Pan, Ting-Ting Jia, Qian-Xia Huang, Yan-Yan Qiu, Jie Xu, Pei-Hao Yin, Tao Liu
Novel methods to improve the anticancer performance of 5-fluorouracil (5-FU) is quite necessary for clinical medicines. In the present work, we fabricated a novel type of mesoporous silica nanoparticles (MSNs)-based inorganic/organic hybrid nanoparticles covalently attached with poly(oligo(ethylene glycol) monomethyl ether methacrylate) (POEGMA) for improved stabilization and targeting peptide (RGD) for targeted delivery with the aim of improving the anticancer performance of 5-FU. Atom transfer radical polymerization (ATRP) initiator functionalized MSN (MSN-Br) was synthesized at first, which was followed by surface-initiated ATRP of water soluble OEGMA and carboxyl-containing monomer (2-succinyloxyethyl methacrylate, SEMA)...
August 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28816386/chemotaxis-guided-hybrid-neutrophil-micromotor-for-actively-targeted-drug-transport
#3
Jingxin Shao, Mingjun Xuan, Hongyue Zhang, Xiankun Lin, Zhiguang Wu, Qiang He
Engineering self-propelled micromotors with good biocompatibility and biodegradability for actively seeking sites of diseases and targeted drug transport remains a huge challenge. Here we demonstrate that neutrophils with intrinsic chemotaxis ability could be transformed into self-guided biohybrid motors through integrating mesoporous silica nanoparticles (MSNs) with high loading capability. To realize the compatibility of neutrophil cells with drug-loaded MSNs, bacteria membranes derived from E. coli were coated onto MSNs in advance by using a camouflaging strategy...
August 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28815500/nanoparticle-mediated-recombinase-delivery-into-maize
#4
Susana Martin-Ortigosa, Brian G Trewyn, Kan Wang
We describe a non-DNA-based system for delivering Cre recombinase protein into maize tissue using gold-plated mesoporous silica nanoparticle (Au-MSN). Cre protein is first loaded into the pores of Au-MSNs and then delivered using the biolistic method to immature embryos of a maize line (Lox-corn), which harbors loxP sites flanking a selection and a reporter gene. The release of the Cre recombinase protein inside the plant cell leads to recombination at the loxP sites, eliminating both genes. Visual screening is used to identify recombination events, which can be regenerated to mature and fertile plants...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28813066/multivalent-mesoporous-silica-nanoparticles-photo-delivering-nitric-oxide-with-carbon-dots-as-fluorescence-reporters
#5
Damien Afonso, Sabrina Valetti, Aurore Fraix, Claudia Bascetta, Salvatore Petralia, Sabrina Conoci, Adam Feiler, Salvatore Sortino
Amino-terminated mesoporous silica nanoparticles embedding carbon dots (MSCD) formed by calcination were functionalized with a nitric oxide (NO) photodonor (1) to give a robust MSCD-1 conjugate. The intense fluorescence of MSCDs was strongly quenched in MSCD-1 by effective energy transfer. Visible light excitation of MSCD-1 liberates NO, suppresses the energy transfer mechanism and leads to concomitant fluorescence restoration of the MSCD scaffold, which acts as an optical reporter for the released NO. The MSCD-1 hybrid is also able to encapsulate the highly hydrophobic photosensitizer temoporfin, preserving the fluorescence reporting function...
August 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28811480/formation-pathways-of-mesoporous-silica-nanoparticles-with-dodecagonal-tiling
#6
Yao Sun, Kai Ma, Teresa Kao, Katherine A Spoth, Hiroaki Sai, Duhan Zhang, Lena F Kourkoutis, Veit Elser, Ulrich Wiesner
Considerable progress in the fabrication of quasicrystals demonstrates that they can be realized in a broad range of materials. However, the development of chemistries enabling direct experimental observation of early quasicrystal growth pathways remains challenging. Here, we report the synthesis of four surfactant-directed mesoporous silica nanoparticle structures, including dodecagonal quasicrystalline nanoparticles, as a function of micelle pore expander concentration or stirring rate. We demonstrate that the early formation stages of dodecagonal quasicrystalline mesoporous silica nanoparticles can be preserved, where precise control of mesoporous silica nanoparticle size down to <30 nm facilitates comparison between mesoporous silica nanoparticles and simulated single-particle growth trajectories beginning with a single tiling unit...
August 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28810734/adsorption-and-depletion-regimes-of-a-nonionic-surfactant-in-hydrophilic-mesopores-an-experimental-and-simulation-study
#7
Dirk Müter, Gernot Rother, Henry Bock, Martin Schoen, Gerhard H Findenegg
Adsorption and aggregation of nonionic surfactants at oxide surfaces has been studied extensively in the past, but only for concentrations below and near the critical micelle concentration. Here we report an adsorption study of a short-chain surfactant (C6E3) in porous silica glass of different pore sizes (7.5 to 50 nm), covering a wide composition range up to 50 wt.-% in a temperature range from 20°C to the LCST. Aggregative adsorption is observed at low concentrations, but the excess concentration of C6E3 in the pores decreases and approaches zero at higher bulk concentrations...
August 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28809107/synthesis-and-insecticidal-activity-of-enzyme-triggered-functionalized-hollow-mesoporous-silica-for-controlled-release
#8
Amir Esmat Kaziem, Yunhao Gao, Shun He, Jianhong Li
In the present study, enzymatic responsive controlled release formulations (CRFs) were fabricated. The CRFs were achieved by anchoring mechanically interlocked molecules using α-cyclodextrin onto the surface pore rims of hollow mesoporous silica (HMS). The CRFs were characterized using Fourier transform infrared spectroscopy, scanning electron microscope, transmission electron microscope, and thermogravimetric analysis. The results showed that the CRFs had extraordinary loading ability for chlorantraniliprole (42% w/w) and could effectively preserve chlorantraniliprole against degradation under thermal conditions and UV radiation...
August 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28803476/rationally-turning-the-interface-activity-of-mesoporous-silicas-for-preparing-pickering-foam-and-dry-water
#9
Xia Rong, Hengquan Yang, Ning Zhao
We develop a novel protocol to prepare smart, gas/water interface-active, mesoporous silica particles. This protocol involves modification of highly mesoporous silicas with a mixture of hydrophobic octyl organosilane and hydrophilic triamine organosilane. Their structure and compositions are characterized by transmission electron microscopy (TEM), N2 sorption, solid state NMR, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FT-IR), Thermogravimetric analysis (TGA) and elemental analysis...
August 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28800223/green-fabrication-of-silkworm-cocoon-like-silicon-based-composite-for-high-performance-li-ion-batteries
#10
Fei-Hu Du, Yizhou Ni, Ye Wang, Dong Wang, Qi Ge, Shuo Chen, Hui Ying Yang
Designing yolk-shell nanostructures is an effective way of addressing the huge volume expansion issue for large-capacity anode and cathode materials in Li-ion batteries (LIBs). Previous studies mainly focused on adopting a SiO2 template through HF etching to create yolk-shell nanostructures. However, HF etching is highly corrosive and may result in a significant reduction of Si content in the composite. Herein, a silkworm cocoon-like silicon-based composite is prepared through a green approach in which Al2O3 was selected as a sacrificial template...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28800139/functionalized-mesoporous-silica-thin-films-as-a-tunable-nonlinear-optical-material
#11
Magdalena Laskowska, Iwan Kityk, Mateusz Dulski, Jarosław Jędryka, Artur Wojciechowski, Jerzy Jelonkiewicz, Marcin Wojtyniak, Łukasz Laskowski
The article is about a novel material for application in optoelectronic devices: mesoporous silica in the form of thin films with vertically aligned channels containing anchored propyl-copper-phosphonate functional groups. We described a synthesis route and carried out characterization of the structure to obtain its nonlinear optical (NLO) properties (second and third order harmonic generation). A quasi phase transition was found in the material resulting from modification of the functional group content. We also demonstrated that it is possible to modify NLO susceptibilities by tuning the distance between active polar units...
August 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28799599/thermal-dependence-of-nanofluidic-energy-conversion-by-reverse-electrodialysis
#12
Junho Hwang, Tatsuki Sekimoto, Wei-Lun Hsu, Sho Kataoka, Akira Endo, Hirofumi Daiguji
The thermal dependence of salinity-gradient-driven energy conversion by reverse electrodialysis using a mesoporous silica thin film with pores ca. 2-3 nm in diameter was studied in a temperature range of 293-333 K. As the temperature increases, the surface charge density of mesopores increases owing to an increase in the zeta potential of the pore walls, which in turn increases the concentration of counter-ions in the electrical double layer. The ion mobility also increases with increasing temperature owing to a decrease in the liquid viscosity...
August 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28799593/zif-derived-porous-carbon-supported-pd-nanoparticles-within-mesoporous-silica-shells-sintering-and-leaching-resistant-core-shell-nanocatalysts
#13
Shaolong Zhang, Aijuan Han, Yanliang Zhai, Jian Zhang, Weng-Chon Cheong, Dingsheng Wang, Yadong Li
A facile strategy to prepare sintering- and leaching-resistant core-shell nanocatalysts is reported. ZIF-derived porous carbon supported Pd nanoparticles are coated with a mesoporous silica shell, preventing Pd nanoparticles from sintering at high temperature and leaching in a catalytic process. This nanocatalyst exhibits excellent catalytic activity and recyclability for the oxidation of benzyl alcohol.
August 11, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28797969/bioactive-mesoporous-silica-nanostructures-with-anti-microbial-and-anti-biofilm-properties
#14
Paul Cătălin Balaure, Bianca Boarca, Roxana Cristina Popescu, Diana Savu, Roxana Trusca, Bogdan Ștefan Vasile, Alexandru Mihai Grumezescu, Alina Maria Holban, Alexandra Bolocan, Ecaterina Andronescu
The increasing rate of antibiotic resistant bacteria associated with nosocomial infections in severely ill patients has urged the need for new antibacterial therapies. Nanostructured materials represent emerging innovative approaches to controlled delivery of different antimicrobial drugs. Delivery systems encapsulating natural compounds with antibacterial effects, such as essential oils have shown a great potential. Herein we report the development of SiO2 mesoporous nanosystems loaded with eucalyptus (EUC), orange (ORA), and cinnamon (CIN) essential oils...
August 7, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28797746/synthesis-of-wrinkled-mesoporous-silica-and-its-reinforcing-effect-for-dental-resin-composites
#15
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVE: The aim of this work is to explore the reinforcing effect of wrinkled mesoporous silica (WMS), which should allow micromechanical resin matrix/filler interlocking in dental resin composites, and to investigate the effect of silica morphology, loading, and compositions on their mechanical properties. METHODS: WMS (average diameter of 496nm) was prepared through the self-assembly method and characterized by the use of the electron microscopy, dynamic light scattering, and the N2 adsorption-desorption measurements...
August 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28796380/thermosensitive-cation-selective-mesochannels-pnipam-capped-mesoporous-thin-films-as-bioinspired-interfacial-architectures-with-concerted-functions
#16
Sonja Schmidt, Sebastián Alberti, Philipp Vana, Galo Soler-Illia, Omar Azzaroni
Rational design and elaborate modular construction of interfacial architectures in which molecular transport is mediated by responsive/adaptive nanostructures has become a growing and fertile field of research in supramolecular materials chemistry. Herein, we present for the first time the use of PNIPAM-capped mesoporous silica thin films as thermosensitive cation-selective mesochannels. Thus far, this feature has only been observed in thermosensitive biological channels. The interfacial architecture created here accomplishes its specific functions through the concerted or simultaneous action of spatially-addressed subunits with temperature response and ion exclusion capabilities...
August 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28795711/rational-design-of-thermo-responsive-adsorbents-demand-oriented-active-sites-for-the-adsorption-of-dyes
#17
Yao Jiang, Shu-Feng Shan, Wei Liu, Jing Zhu, Qiu-Xia He, Peng Tan, Lei Cheng, Xiao-Qin Liu, Lin-Bing Sun
A smart adsorbent RA@MS is fabricated by incorporating a di-block copolymer through the combination of the thermo-responsive block poly(N-isopropylacrylamide) (R) and the active block poly{N-[3-(dimethylamino) propyl]methacrylamide} (A, tertiary amines as basic sites) into mesoporous silica. The di-block copolymer RA preserves the thermo-responsive nature, which makes the active sites reversibly exposed/blocked in light of temperature variation. The obtained adsorbent possessing thermo-responsive properties can thus realize both selective adsorption and efficient regeneration for temperature-swing adsorption (TSA) of dyes...
August 10, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28795574/molecularly-imprinted-porous-monolithic-materials-from-melamine-formaldehyde-for-selective-trapping-of-phosphopeptides
#18
Mingquan Liu, Tri Minh Tran, Ahmed Awad Abbas Elhaj, Silje Bøen Torsetnes, Ole Nørregaard Jensen, Börje Sellergren, Knut Irgum
Thirty-five melamine-formaldehyde (MF) monolithic materials with bimodal pore distributions were synthesized in fused silica capillaries by catalyst-free polycondensation, starting with an aqueous MF precondensate, using acetonitrile as macroporogen and a variety of aliphatic polyethers and triblock copolymeric surfactants as porogens and mesoporogens, respectively. By varying the prepolymer composition and the type and molecular weights of the polymeric porogen components, a library of porous monolithic materials were produced, covering a range of meso- and macroporous properties...
August 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28795557/nir-light-temperature-ph-and-redox-responsive-polymer-modified-reduced-graphene-oxide-mesoporous-silica-sandwich-like-nanocomposites-for-controlled-release
#19
Panjun Wang, Shuo Chen, Ziquan Cao, Guojie Wang
Here a novel quadruple-responsive nanocarrier based on reduced graphene oxide/mesoporous silica sandwich-like nanocomposites (rGO@MS) modified by pH- and temperature-responsive poly(dimethylaminoethyl methacrylate) (PDMAEMA) with a linker of disulfide was constructed via surface-initiated atom transfer radical polymerization. The polymer chains would be used as gatekeepers to control the release of the loaded cargo molecules under pH, temperature, NIR light and redox stimuli. The cargo molecules (rhodamine B) were demonstrated to release from the polymer-modified nanocomposites triggered by the quadruple-stimuli...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28783517/chemisorption-of-lanthanide-ions-on-succinate-functionalized-mesoporous-silica-an-in-situ-characterization-by-fluorescence
#20
M Verónica Lombardo, Martín Mirenda, Andrea V Bordoni, Alejandro Wolosiuk, Alberto E Regazzoni
Chemisorption of Eu(3+) and Tb(3+) on SBA-15 functionalized with succinic groups has been studied by in situ steady-state fluorescence measurements. The enhancement of the emission sensitive bands indicates that both ions adsorb forming inner-sphere surface complexes. Adsorption is a fast process that attains equilibrium in about 5min. The variation of the peaks maxima (I592 and I616, for europium, and I490 and I545, for terbium) with the total ion concentration is accounted for by the sum of the contributions due to the adsorbed and free ions...
August 1, 2017: Journal of Colloid and Interface Science
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