Структурные И Спектральные Особенности Композитов На Основе Белковых Сред С Одностенными Углеродными Нанотрубоками

Abstract

Исследованы структурные особенности нанокомпозитов, полученных при лазерном облучении водно-белковых сред с одностенными углеродными нанотрубками (ОУНТ), электродуговым (ОУНТI) и газофазным методами (ОУНТII). С помощью спектроскопии комбинационного рассеяния нанокомпозитов определен нековалентный характер взаимодействия нанотрубок с молекулами белков. Белковая составляющая в нанокомпозитах подверглась необратимой денатурации и может выступать в качестве связующего биосовместимого материала, который является источником аминокислот для биологических тканей при имплантации нанокомпозитов в организм. Образцы, изготовленные из ОУНТI, с меньшим диаметром и длиной имели наиболее однородную структуру. При увеличении концентрации от 0.01 до 0.1 % происходило увеличение среднего размерамикропор от 45 до 85 мкм и пористости образца в общем с 46 до 58 %. При этом доля открытых пор для двух типов концентраций ОУНТI составила 2 % от общего объема композита. В нанокомпозитах на основе ОУНТI показано наличие мезопор. Увеличение концентрации нанотрубок привело к уменьшению удельных значений поверхности и объема пор образца. Исследованные нанокомпозиты могут использоваться в качестве тканеинженерных матриц для восстановления объемных дефектов биологических тканей
 
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Physicochemical and Biocidal Properties of Nickel–Tin and Nickel–Tin—Titania Coatings

“…Such results are most likely due to the photocatalytic antibacterial activity of the Ni-Sn-TiO 2 composite electrochemical coating in the presence of UV radiation [43][44][45] due to the damage to bacterial cell membranes caused by the absorption of radiation by intracellular chromophores.…”

“…Due to its unique properties, nanosized TiO 2 is widely used as a photocatalyst for the decomposition of organic pollutants and inhibitors of microorganisms [37,38]. The widespread use of TiO 2 is based on its effective photocatalytic activity [39][40][41] and high chemical stability [42][43][44]. In works [42][43][44][45][46][47][48], its antibacterial efficacy under the influence of UV radiation has been studied.…”

“…The widespread use of TiO 2 is based on its effective photocatalytic activity [39][40][41] and high chemical stability [42][43][44]. In works [42][43][44][45][46][47][48], its antibacterial efficacy under the influence of UV radiation has been studied. It should be noted that titanium oxide, which naturally occurs in various modifications (anatase, rutile, brookite), as a rule, is not a photocatalyst.…”