Femtosecond laser modification of titanium surfaces: direct imprinting of hydroxylapatite nanopowder and wettability tuning via surface microstructuring

Abstract

Femtosecond laser modification of titanium surfaces was performed to produce microstructured hydrophilic and biocompatible surface layers. Biocompatible nano/microcoatings were prepared for the first time by dry femtosecond laser imprinting of hydroxylapatite nano/micropowder onto VT6 titanium surfaces. In these experiments HAP was first deposited onto the titanium surfaces and then softly imprinted by multiple femtosecond laser pulses into the laser-melted surface metal layer. The surface relief was modified at the nano-and microscales depending on the incident laser fluence and sample scanning speed. Wetting tests demonstrated that the wetting properties of the pristine Ti surface can be tuned through its laser modification in both the hydrophobic and hydrophilic directions.

Spreading and Drying Dynamics of Water Drop on Hot Surface of Superwicking Ti-6Al-4V Alloy Material Fabricated by Femtosecond Laser

“…At the incidence angle of the laser beam between 30° and 80°, the LIPSS period for metals is typically in a range of 1–4 µm [ 65 ] that agrees with the range of d for the fine periodic microgrooves observed on the micropillar/microhole walls in our study. Previously, it has been shown that the surfaces of metals and Ti-6Al-4V alloy undergo a significant femtosecond laser-induced oxidation [ 67 , 68 , 69 ]. Therefore, after laser processing of the sample, we performed an EDS examination of the elemental composition of the laser-treated surface.…”

Effect of Processing by Femtosecond Pulsed Laser on Mechanical Properties of Submicrocrystalline Titanium

“…The regimes of laser processing and the structure that is formed due to such processing have been analyzed in [11]. The structure exhibits ordered microand nanorelief, in particular, grooves that are parallel to the scanning direction.…”

“…To choose the modification regimes, we use the results of the previous work, in which we have structurally modified SMC titanium using FLR. The results of [11] show that different types of relieves can be obtained at different laser fluences and scanning rates. The modification regime with the parameters F = 0.3 J/cm 2 and = 18 μm/s is optimal with respect to biocompatibility.…”

Влияние Поверхностной Обработки Фемтосекундным Импульсным Лазерным Излучением На Механические Свойства Субмикрокристаллического Титана

“…Выбор режима модификации производился на осно-ве результатов предыдущей работы авторов по струк-турированию СМК титана фемтосекундным лазерным излучением, в которой были получены различные типы рельефа в зависимости от плотности энергии лазерного излучения и скорости сканирования [11]. Такой режим модификации с выбранными параметрами F = 0.3 J/cm ности не образуется глубоких пор и трещин, которые могут являться концентраторами напряжений, ведущих к понижению прочностных характеристик материала, особенно при циклических нагрузках.…”

“…Режимы лазерной обработки подробно изучены в работе [11], где и описана детально формирующаяся при такой обработке структура. Последняя представля-ет упорядоченную структуру с характерным микро-и нанорельефом, в том числе отчетливо проявляющихся бороздок, параллельных направлению сканирования.…”