U 88 Use of low-molecular polyacrylic acid as the dispersant of Nd3+, Yb3+ doped Y2O3 nanoparticles for slip casting and sintering of laser ceramics [Text] / I. Puzyrev, M. Ivanov, V. Osipov, Yu. G. Yatluk // Nanotech Insight 2007 : The International conference on Nanotechnology, Luxor, Egypt, 10-17 march 2007 : abstr. . - Luxor, Egypt, 2007. - P310-311 : табл. - Bibliogr. : p. 311 (3 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ |
T 44 The effect of acrylic copolymer on viscosity and stability of suspensions of the nanopowders YSZ in isopropanol [Text] / I. Puzyrev, A. S. Lipilin, V. Ivanov, Yu. G. Yatluk // Nanotech Insight 2007 : The International conference on Nanotechnology, Luxor, Egypt, 10-17 march 2007 : abstr. . - Luxor, Egypt, 2007. - P311-313. - Bibliogr. : p. 313 (2 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ |
Variation in tumor pH affects pH-triggered delivery of peptide-modified magnetic nanoparticles / A. G. Pershina, O. Y. Brikunova, S. V. Vtorushin [et al.] // Nanomedicine: nanotechnology, biology and medicine. - 2021. - Vol. 32. - P102317 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): PH PROFILE -- ENDOCYTOSIS -- IRON OXIDE MAGNETIC NANOPARTICLES Аннотация: Acidification of the extracellular matrix, an intrinsic characteristic of many solid tumors, is widely exploited for physiologically triggered delivery of contrast agents, drugs, and nanoparticles to tumor. However, pH of tumor microenvironment shows intra- and inter-tumor variation. Herein, we investigate the impact of this variation on pH-triggered delivery of magnetic nanoparticles (MNPs) modified with pH-(low)-insertion peptide (pHLIP). Fluorescent flow cytometry, laser confocal scanning microscopy and transmission electron microscopy data proved that pHLIP-conjugated MNPs interacted with 4T1 cells in two-dimensional culture and in spheroids more effectively at pH 6.4 than at pH 7.2, and entered the cell via clathrin-independent endocytosis. The accumulation efficiency of pHLIP-conjugated MNPs in 4T1 tumors after their intravenous injection, monitored in vivo by magnetic resonance imaging, showed variation. Analysis of the tumor pH profiles recorded with implementation of original nanoprobe pH sensor, revealed obvious correlation between pH measured in the tumor with the amount of accumulated MNPs. |
Grafting of (3-chloropropyl)-trimethoxy silane on halloysite nanotubes surface / A. M. Abu El-Soad, G. Lazzara, A. V. Pestov [et al.] // Applied sciences. - 2021. - Vol. 11, № 12. - Ст. 5534 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): GRAFTING -- HALLOYSITE NANOTUBES -- CPTMS Аннотация: Modified halloysite nanotubes (HNTs-Cl) were synthesized by a coupling reaction with (3-chloropropyl) trimethoxysilane (CPTMS). The incorporation of chloro-silane onto HNTs surface creates HNTs-Cl, which has great chemical activity and is considered a good candidate as an active site that reacts with other active molecules in order to create new materials with great applications in chemical engineering and nanotechnology. The value of this work lies in the fact that improving the degree of grafting of chloro-silane onto the HNT’s surface has been accomplished by incorporation of HNTs with CPTMS under different experimental conditions. Many parameters, such as the dispersing media, the molar ratio of HNTs/CPTMS/H2O, refluxing time, and the type of catalyst were studied. The greatest degree of grafting was accomplished by using toluene as a medium for the grafting process, with a molar ratio of HNTs/CPTMS/H2O of 1:1:3, and a refluxing time of 4 h. The addition of 7.169 mmol of triethylamine (Et3N) and 25.97 mmol of ammonium hydroxide (NH4OH) led to an increase in the degree of grafting of CPTMS onto the HNT’s surface. |
Nanocomposite hydrogels for wastewater treatment / V. Madhavi, T. Ramesh, N. B. Reddy, G. V. Zyryanov // AIP conference proceedings. - 2022. - Vol. 2390. - Ст. 020043 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): HYDROGELS -- NANOCOMPOSITES -- NANOTECHNOLOGY Аннотация: The insufficient access to drinking water is one of the most prevailing problems throughout the world. It is highly essential for future demands to bring wastewater to reusable form. Hence, water purification has been the focus and attention of many scientists and governmental agencies. The combination of adsorption and nanotechnology-oriented approach with conventional treatment methods has offered interesting benefits to treat waste water. During the last decade, hydrogels have been used as potential adsorbents for the removal of different types of water pollutants. The combination of hydrogels and nanomaterials with multifunctional framework leads to the development of hybrid hydrogels that gives synergistic effect to the novel materials. Because of their biocompatibility and ability to mix with other materials, hydrogels coupled with versatile chemical groups with well-defined three-dimensional porous structure were potentially used for removal of toxic pollutants in water. This article briefly reviews the recent progress in nanobased hydrogels with particular emphasis on wastewater treatment applications. |