Thermal inertization of amphibole asbestos modulates Fe topochemistry and surface reactivity

Approximately 60,000 tons per day of waste from taconite mining, tailing, are added to the west arm of Lake Superior at Silver Bay. Tailings contain nearly the same amount of quartz and amphibole asbestos, cummingtonite and actinolite in fibrous form. Cummingtonite fibres from 0.01μm in length have been found in the water supply for Minnesota municipalities.The purpose of the research work was to develop a method for asbestos fibre counts and identification in water and apply it for the enumeration of fibres in water samples collected(a) at various stations in Lake Superior at two depth: lm and at the bottom.(b) from various rivers in Lake Superior Drainage Basin.

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EFFECT OF MICROMORPHOLOGY AND SURFACE REACTIVITY OF SEVERAL UNUSUAL FORMS OF CRYSTALLINE SILICA ON THE TOXICITY TO A MONOCYTE-MACROPHAGE TUMOR CELL LINE

Inhalation Toxicology ◽

10.1080/08958370050164914 ◽

2000 ◽

Vol 12 (sup3) ◽

pp. 81-89 ◽

Cited By ~ 7

Author(s):

I. Fenoglio, B. Fubini, R. Tiozzo, F.

Keyword(s):

Tumor Cell ◽

Cell Line ◽

Tumor Cell Line ◽

Crystalline Silica ◽

Surface Reactivity

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Thermally-Induced Dehydrogenative Coupling of Organosilanes and H-Terminated Silicon Quantum Dots onto Germanane Surfaces

10.26434/chemrxiv.11794404 ◽

2020 ◽

Author(s):

Haoyang Yu ◽

Alyxandra Thiessen ◽

Md Asjad Hossain ◽

Marc Julian Kloberg ◽

Bernhard Rieger ◽

...

Keyword(s):

2D Materials ◽

Future Generation ◽

Optical Devices ◽

Surface Reactivity ◽

Organic Monolayers ◽

Present Contribution ◽

Thermally Induced ◽

Dehydrogenative Coupling ◽

Silicon Quantum Dot ◽

Covalently Bonded

<div><div><div><p>Covalently bonded organic monolayers play important roles in defining the solution processability, ambient stability, and electronic properties of two-dimensional (2D) materials such as Ge nanosheets (GeNSs); they also hold promise of providing avenues for the fabrication of future generation electronic and optical devices. Functionalization of GeNS normally involves surface moieties linked through covalent Ge−C bonds. In the present contribution we extend the scope of surface linkages to include Si−Ge bonding and present the first demonstration of heteronuclear dehydrocoupling of organosilanes to hydride-terminated GeNSs obtained from the deintercalation and exfoliation of CaGe2. We further exploit this new surface reactivity and demonstrated the preparation of directly bonded silicon quantum dot-Ge nanosheet hybrids.</p></div></div></div>

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Recent Advances in Application of Azobenzenes Grafted on Mesoporous Silica Nanoparticles in Controlled Drug Delivery Systems Using Light as External Stimulus

Mini-Reviews in Medicinal Chemistry ◽

10.2174/1389557519666190904145355 ◽

2020 ◽

Vol 20 (11) ◽

pp. 1001-1016

Author(s):

Sandra Ramírez-Rave ◽

María Josefa Bernad-Bernad ◽

Jesús Gracia-Mora ◽

Anatoly K. Yatsimirsky

Keyword(s):

Drug Delivery ◽

Mesoporous Silica ◽

Silica Nanoparticles ◽

Drug Delivery Systems ◽

Mesoporous Silica Nanoparticles ◽

High Surface ◽

Delivery Systems ◽

Surface Reactivity ◽

External Stimulus ◽

Recent Advances

Hybrid materials based on Mesoporous Silica Nanoparticles (MSN) have attracted plentiful attention due to the versatility of their chemistry, and the field of Drug Delivery Systems (DDS) is not an exception. MSN present desirable biocompatibility, high surface area values, and a well-studied surface reactivity for tailoring a vast diversity of chemical moieties. Particularly important for DDS applications is the use of external stimuli for drug release. In this context, light is an exceptional alternative due to its high degree of spatiotemporal precision and non-invasive character, and a large number of promising DDS based on photoswitchable properties of azobenzenes have been recently reported. This review covers the recent advances in design of DDS using light as an external stimulus mostly based on literature published within last years with an emphasis on usually overlooked underlying chemistry, photophysical properties, and supramolecular complexation of azobenzenes.

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Interference of Gold Nanoparticles with In vitro Endotoxin Detection Assays

Current Nanoscience ◽

10.2174/1573413715666181212120013 ◽

2020 ◽

Vol 16 (2) ◽

pp. 204-213 ◽

Cited By ~ 1

Author(s):

Melissa A. Vetten ◽

Mary Gulumian

Keyword(s):

Gold Nanoparticles ◽

Gold Nanoparticle ◽

Surface Reactivity ◽

In Vitro Assays ◽

Limulus Amebocyte Lysate ◽

Chromogenic Assay ◽

Nanoparticle Suspensions ◽

Endotoxin Contamination ◽

Factor C

Background: Endotoxin-free engineered nanoparticle suspensions are imperative for their successful applications in the field of nanomedicine as well as in the investigations in their toxicity. Gold nanoparticles are known to interfere with various in vitro assays due to their optical properties and potential for surface reactivity. In vitro endotoxin testing assays are known to be susceptible to interference caused by the sample being tested. Objective: This study aimed to identify a preferred assay for the testing of endotoxin contamination in gold nanoparticle suspensions. Methods: The interference by gold nanoparticles on three assays namely, the commonly used limulus amebocyte lysate chromogenic assay, the limulus amebocyte lysate gel-clot method, and the less common recombinant Factor C (rFC) assay, was tested. Results: Possible interference could be observed with all three assays. The interference with the absorbance- based chromogenic assay could not be overcome by dilution; whilst the qualitative nature of the gel-clot assay excluded the possibility of distinguishing between a false positive result due to enhancement of the sensitivity of the assay, and genuine endotoxin contamination. However, interference with the rFC assay was easily overcome through dilution. Conclusion: The rFC assay is recommended as an option for endotoxin contamination detection in gold nanoparticle suspensions.

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