Two kinds of materials, sprayed-on crocidolite and sprayed-on amosite, containing crocidolite and amosite respectively, were treated with aqueous acetic acid solution, the pH of which was adjusted with an ammonium acetate buffer at 5, in order to remove soluble components of cement. The liquids were filtrated with a membrane filter, and the residue collected as crocidolite samples and amosite samples, respectively. The Crocidolite and amosite thus obtained were heated up to 600-1300? C for 1h. Then, power X-ray diffraction XRD experiment, scanning electron microscopic SEM observation, and thermal analysis TGDTA were carried out for these burned specimens in order to observe the change of the burned materials and melting behaviors together with their thermal properties. In addition, CaCO 3 and CaCl 2 were mixed with the respective sprayed-on asbestos and sprayed-on crocidolite, and a TGDTA measurement was conducted on these mixtures. Based on the SEM observation and XRD experiment on the specimens used in the TGDTA measurements, we tried to decompose the crocidolite and amosite, applying the method of low-temperature decomposition, the applicability of which was previously confirmed in the study on the case of chrysolite. The temperature of the TGDTA measurement could be raised up to 1000? C, and it became evident that in the cases of specimens where CaCl 2 was added, all the asbestos fibers had decomposed, but not in any other specimen. The crocidolite specimen became rounded in shape when it was heated up to 1000? C, and it looked as if it was densified due to burning. CaCO 3 and CaCl 2 were added to this burned crocidolite, and decomposition of the material after burning was examined. In a DTA thermogram, an endothermic peak was recognized, which corresponds to the formation of a melt of CaCO 3 -CaO-CaCl 2 as summarized in the previous report. Thus it is experimentally verified that burned crocidolite decomposes at high temperatures.
Here we demonstrate the nanozyme properties of histidine‐containing carbon nanodots as externally tunable antibacterial agents through irradiation with visible (VIS) light. The correlative (light and electron) microscopic analysis of treated Escherichia coli O157:H7 revealed that the positive charged carbon nanoparticles might readily adsorb at slightly acid pH on the negative charged cellular envelope of bacteria, and thus, inhibit their growth with over 80% efficiency under illumination with VIS light. The reason was that under VIS irradiation in the range 400–500 nm the adsorbed nanoparticles behaved as effective oxidase‐mimicking enzymes and generated reactive oxygen species on the labeled cells. Thus, the light‐activated artificial nanozyme caused serious physical damaging of bacterial envelope, which was leading to irreversible cellular inhibition. The outcomes of this study are likely to broaden the scope of designed photoactive carbon nanozymes as powerful antibacterial agents against the emergence of antibiotic and multidrug‐resistant strains, as well as proposing of new strategies for infection control.
F# ñąñú ɂĀLow-temperature decomposition of sprayed-on asbestos was studied in the presence of flon-decomposition products or CaCl 2 -CaCO 3 mixtures. In a reaction system to which flon-decomposition products were added, chrysotile and its decomposition product, forsterite, maintaining the needle form underwent destruction by heating at 800? C for 2 h. The optimum mixing ratio of the sprayed-on asbestos to the flon-decomposition product was obtained when the content of the latter was very slightly larger than that for the asbestosflon-decomposition product ratio 21 by weight. When the sprayed-on asbestos mixed with the CaCl 2 was heated at 700? C, forsterite as well as chrysotile in the material were completely decomposed.
To increase the capacity of the negative electrode for lithium-ion secondary batteries, we prepared Si-containing carbon microspheres. The target compound was obtained by thermal decomposition of hexaphenyldisilane embedded in porous carbon particles that contained Si-nanoparticles characterized by various methods. When charging/discharging characteristics were evaluated using a cell having the obtained material as a negative electrode, a remarkable improvement in charging characteristics was observed.
Multifunctional programmed nanomachines with theranostic functions demonstrated great potential in the clinical practice of oncology, as well as the personalized nanomedicine. The reason is because such nanoagents with combined diagnostic and therapeutic functions were found to be highly effective for cancer treatment. The appropriate design of nanomachines allows them to overcome the biological barriers of proliferative tumors and to distinguish the cancer cells from their normal counterparts. Moreover, the use of biocompatible and biodegradable precursors for construction of nanomachines minimize significantly the caused adverse effects to the normal tissue cells, which is a main problem of the chemotherapy. In addition, the utilization of theranostic nanomachines also enables an improved selectivity to the cancer in respect to its intrinsic complexity, heterogeneity, and dynamic evolution. Here we present the programmable functions and performance of the microenvironment-responsive nanomachines at a molecular level for cancer imaging and therapy.
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