scholarly journals Exploring the Interactions of Ruthenium (II) Carbosilane Metallodendrimers and Precursors with Model Cell Membranes through a Dual Spin-Label Spin-Probe Technique Using EPR

Biomolecules ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 540 ◽  
Author(s):  
Riccardo Carloni ◽  
Natalia Sanz del Olmo ◽  
Paula Ortega ◽  
Alberto Fattori ◽  
Rafael Gómez ◽  
...  
Keyword(s):  
Spin Label ◽  
Spin Probe ◽  
Cell Membranes ◽  
Antitumor Agents ◽  
Hydrophobic Interactions ◽  
High Surface ◽  
High Surface Area ◽  
Surface Groups ◽  
Model Cell

Dendrimers exhibit unique interactions with cell membranes, arising from their nanometric size and high surface area. To a great extent, these interactions define their biological activity and can be reported in situ by spin-labelling techniques. Schiff-base carbosilane ruthenium (II) metallodendrimers are promising antitumor agents with a mechanism of action yet to explore. In order to study their in situ interactions with model cell membranes occurring at a molecular level, namely cetyltrimethylammonium bromide micelles (CTAB) and lecithin liposomes (LEC), electron paramagnetic resonance (EPR) was selected. Both a spin probe, 4-(N,N-dimethyl-N-dodecyl)ammonium-2,2,6,6-tetramethylpiperidine-1-oxyl bromide (CAT12), able to enter the model membranes, and a spin label, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) covalently attached at newly synthesized heterofunctional dendrimers, were used to provide complementary information on the dendrimer–membrane interactions. The computer-aided EPR analysis demonstrated a good agreement between the results obtained for the spin probe and spin label experiments. Both points of view suggested the partial insertion of the dendrimer surface groups into the surfactant aggregates, mainly CTAB micelles, and the occurrence of both polar and hydrophobic interactions, while dendrimer–LEC interactions involved more polar interactions between surface groups. We found out that subtle changes in the dendrimer structure greatly modified their interacting abilities and, subsequently, their anticancer activity.

In-situ Mössbauer effect spectroscopy of adsorbed species on high surface area electrodes

1982 ◽  
Vol 10 (3) ◽  
pp. 325-332 ◽  
Author(s):  
D. Scherson ◽  
S.B. Yao ◽  
E.B. Yeager ◽  
J. Eldridge ◽  
M.E. Kordesch ◽  
...  
Keyword(s):  
Surface Area ◽  
Mössbauer Effect ◽  
High Surface ◽  
High Surface Area ◽  
Mossbauer Effect ◽  
Adsorbed Species ◽  
Mössbauer Effect Spectroscopy

scholarly journals The synthesis of a BiOClxBr1−x nanostructure photocatalyst with high surface area for the enhanced visible-light photocatalytic reduction of Cr(vi)

RSC Advances ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 4763-4771 ◽  
Author(s):  
Muhammad Bilal Hussain ◽  
Malik Saddam Khan ◽  
Herman Maloko Loussala ◽  
Muhammad Sohail Bashir
Keyword(s):  
Visible Light ◽  
Surface Area ◽  
Room Temperature ◽  
High Surface ◽  
High Surface Area ◽  
Photocatalytic Reduction ◽  
Synthetic Process ◽  
Visible Light Photocatalytic

Cr(vi) reduction is performed by BiOCl0.8Br0.2 composite produced via a facile in situ synthetic process at room temperature while making use of PVP (Mw = 10 000).

In situ carbonization of a soft-template to directly synthesize crystalline mesoporous metal oxides with high surface areas

2014 ◽  
Vol 38 (12) ◽  
pp. 5846-5855 ◽  
Author(s):  
Limin Guo ◽  
Shintaro Ida ◽  
Takashi Daio ◽  
Hidehisa Hagiwara ◽  
Tatsumi Ishihara
Keyword(s):  
High Surface ◽  
Tantalum Oxide ◽  
High Surface Area ◽  
Soft Template ◽  
Block Polymer ◽  
Surface Areas ◽  
Mesoporous Metal Oxides ◽  
Mesoporous Metal ◽  
In Situ Carbonization

High-surface-area crystalline mesoporous tantalum oxide has been successfully synthesized using a pluronic tri-block polymer as the template.

scholarly journals Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 8
Author(s):  
Emmanuel O. Ogunsona ◽  
Koffi L. Dagnon ◽  
Nandika Anne D'Souza
Keyword(s):  
Surface Area ◽  
Supercritical Co2 ◽  
Hydrophobic Interactions ◽  
High Surface ◽  
High Surface Area ◽  
Bubble Nucleation ◽  
Environmentally Benign ◽  
Compressive Properties ◽  
Layer Double Hydroxides ◽  
Double Hydroxides

Developing an environmentally benign styrene foam is a critical environmental need. Supercritical CO2 use in foams has proven to be a valuable path. Adding fillers to increase bubble nucleation has been pursued concurrently. A prominent filler used is high surface area fillers, such as smectic clays. However, all studies to date show a limit of 152% in compressive moduli and 260% in the compressive stress. The values, even with such gains, limit structural application. A seminal work in 1987 by Suh and Cotton proved that carbonyl linkages in calcium carbonates and CO2 interact and impact nucleation efficiency and performance in supercritical CO2 foams. In this paper, a high surface area clay (layer double hydroxides) which begins in an exfoliated state, then functionalized with a long chain alkyl carboxylate (stearic acid) is synthesized. The result is a remarkable multi-fold improvement to the compressive properties in comparison to polystyrene (PS); a 268% and 512% increase in compressive modulus and strength, respectively. Using a pre-delaminated approach, the higher surface area was achieved in the clays. The presence of the stearate improved the interactions between the clay galleries and PS through hydrophobic-hydrophobic interactions. The glass transition temperature of the nanocomposites was observed to shift to higher values after foaming. The results point to a new path to increase performance using a pre-delaminated clay with functional groups for environmentally benign foams.

scholarly journals Converting cellulose nanocrystals into photocatalysts by functionalisation with titanium dioxide nanorods and gold nanocrystals

RSC Advances ◽  
2020 ◽  
Vol 10 (61) ◽  
pp. 37374-37381
Author(s):  
Santhosh S. Nair ◽  
Jianhong Chen ◽  
Adam Slabon ◽  
Aji P. Mathew
Keyword(s):  
Titanium Dioxide ◽  
Surface Charge ◽  
Water Purification ◽  
Cellulose Nanocrystals ◽  
High Surface ◽  
High Surface Area ◽  
Building Blocks ◽  
Surface Groups ◽  
Gold Nanocrystals ◽  
Titanium Dioxide Nanorods

Cellulose nanocrystals (CNCs) are promising building blocks for water purification due to their high surface area, tuneability of surface charge and grafting of surface groups depending on the pollutants.

Novel Base Catalysts by Nitridation of Zeolite Y: Characterization and Catalytic Evaluation

2010 ◽  
Vol 148-149 ◽  
pp. 1096-1099
Author(s):  
Gong Ming Peng ◽  
De Lian Yi ◽  
Lin Wu ◽  
Zhao Hui Ou Yang ◽  
Jian Guo Wang
Keyword(s):  
Surface Area ◽  
Zeolite Y ◽  
High Surface ◽  
High Surface Area ◽  
Diethyl Malonate ◽  
Bet Surface Area ◽  
In Situ Drifts ◽  
Base Catalysts ◽  
Diffuse Reflectance Infrared

Novel base catalysts were obtained by subjecting Y zeolites to nitridation. These materials were characterized by elemental analysis, X-ray diffraction, BET surface area analysis, In situ diffuse reflectance infrared fourier transform Spectroscopy (in situ DRIFTS), Pyrrole adsorption. The results indicated nitrogen-incorporated NaY zeolite was well ordered and possess high surface area and pore volume. In situ DRIFTS experiments confirmed that N atoms had been introduced into the framework by nitridation to form -NH2- or -NH- species. It was found that Lewis basicity of these oxynitride materials increased by the pyrrole adsorption. Furthmore, the basic catalytic properties of nitrogen-incorporated zeolites were evaluated by Knoevenagal condensation of benzaldehyde with diethyl malonate and enhanced yield of product was achieved.

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