Композит гидроксиапатит-многостенные углеродные нанотрубки: Исследование пористости методом терагерцовой спектроскопии во временной области

Методом терагерцовой спектроскопии во временной области в диапазоне частот 0.25-1.1 ТГц изучены оптические свойства керамического биокомпозитного материала на основе гидроксиапатита (ГА) с добавками до 0.5 мас.% многостенных углеродных нанотрубок (МУНТ). Было обнаружено, что показатель преломления композита колеблется от 2.6 до 2.8 в зависимости от пористости материала. Коэффициент поглощения уменьшается с увеличением концентрации МУНТ в керамическом биокомпозите. Значения показателя преломления и коэффициента поглощения нашей керамики близки к таковым для кортикальной кости, дентина и эмали. Кривые поглощения показывают частотные пики, положение которых соответствует размерам макрокристаллитов. Размер макрокристаллитов уменьшается с увеличением концентрации МУНТ, что приводит к увеличению микротвердости в соответствии с уравнением Холла-Петча. Временная задержка прохождения терагерцового сигнала через образец увеличивается при более высокой концентрации МУНТ. Это указывает на то, что нанотрубки, внедренные в матрицу ГА, заполняют поры и уменьшают площадь порового пространства, что увеличивает плотность керамического композита и уменьшает его пористость.

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