Spectral analysis combined with nonlinear optical measurement of laser printed biopolymer composites comprising chitosan/SWCNT

Savelyev, Mikhail S.; Gerasimenko, Alexander Yu.; Vasilevsky, Pavel N.; Fedorova, Yulia O.; Groth, Thomas; Ten, G. N.; Telyshev, D. V.

doi:10.1016/j.ab.2020.113710

Cited by 16 publications

(10 citation statements)

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“…It has previously been shown that laser irradiation of nanotubes leads to the binding of carbon nanotubes [ 44 ]. Moreover, a laser-induced SWCNT framework structure formation in an albumin- and chitosan-based biopolymer matrix is possible [ 45 ]. The laser-induced SWCNT framework provides an increased strength of the biopolymer material [ 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Reconstruction of Soft Biological Tissues Using Laser Soldering Technology with Temperature Control and Biopolymer Nanocomposites

et al. 2022

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Laser soldering is a current biophotonic technique for the surgical recovery of the integrity of soft tissues. This technology involves the use of a device providing laser exposure to the cut edges of the wound with a solder applied. The proposed solder consisted of an aqueous dispersion of biopolymer albumin (25 wt.%), single-walled carbon nanotubes (0.1 wt.%) and exogenous indocyanine green chromophore (0.1 wt.%). Under laser exposure, the dispersion transforms into a nanocomposite due to the absorption of radiation and its conversion into heat. The nanocomposite is a frame structure of carbon nanotubes in a biopolymer matrix, which provides adhesion of the wound edges and the formation of a strong laser weld. A new laser device based on a diode laser (808 nm) has been developed to implement the method. The device has a temperature feedback system based on a bolometric infrared matrix sensor. The system determines the hottest area of the laser weld and adjusts the current supplied to the diode laser to maintain the preset laser heating temperature. The laser soldering technology made it possible to heal linear defects (cuts) in the skin of laboratory animals (rabbits) without the formation of a fibrotic scar compared to the control (suture material). The combined use of a biopolymer nanocomposite solder and a laser device made it possible to achieve a tensile strength of the laser welds of 4 ± 0.4 MPa. The results of the experiment demonstrated that the addition of single-walled carbon nanotubes to the solder composition leads to an increase in the ultimate tensile strength of the laser welds by 80%. The analysis of regenerative and morphological features in the early stages (1–3 days) after surgery revealed small wound gaps, a decrease in inflammation, the absence of microcirculatory disorders and an earlier epithelization of laser welds compared to the control. On the 10th day after the surgical operation, the laser weld was characterized by a thin cosmetic scar and a continuous epidermis covering the defect. An immunohistochemical analysis proved the absence of myofibroblasts in the area of the laser welds.

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Section: Resultsmentioning

confidence: 99%

Reconstruction of Soft Biological Tissues Using Laser Soldering Technology with Temperature Control and Biopolymer Nanocomposites

et al. 2022

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“…В случае исследований методом Z-сканирования с открытой апертурой положение образца выбиралось таким образом, чтобы в диапазоне 20−40 cm относительно фокуса линзы нормированное пропускание T оставалось близким к единице; при фиксированном же расположении образца начальные условия задавались входной энергией импульса, которая для 355 и 532 nm составляла 5 и 16 µJ соответственно. Отличительной чертой оптической схемы проводимых экспериментов от выполненных ранее [2,3,30,40] является использование специальной оптической компоненты -формирователя лазерного луча, который позволяет придать ему плоскую вершину в фокусе линзы для указанных длин волн. Стоит особо отметить, что в ультрафиолетовом диапазоне такие исследования проводятся гораздо реже и, как правило, требуют использования специализированной оптики.…”

Section: материалыunclassified

“…Несмотря на большое разнообразие моделей, описывающих соотношение нелинейного коэффициента поглощения с интенсивностью, они основаны на существенных приближениях, в частности, ограничиваются механизмами обратного насыщения поглощения, индуцированного двух-или трехфотонным поглощением, а также поглощением на свободных носителях [41]. При этом интерпретация результатов при возникновении индуцированного рассеяния вызывает сложности, связанные с увеличением оптического пути внутри образца и возрастанием вследствие этого поглощения [40]. Для дисперсий более точно описать теоретическую кривую возможно с использованием пороговой модели, которая к тому же позволяет определить значение пороговой интенсивности [3].…”

Section: теоретический анализ пороговой модели для луча с плоской вер...unclassified

“…Определение теоретического значения прошедшей интенсивности выполняется в соответствии с уравнением переноса излучения [2,3] для нелинейной пороговой зависимости коэффициента поглощения от падающей интенсивности I 0 . Сама зависимость коэффициента поглощения от интенсивности задается эффективными значениями, так как в дисперсиях может происходить образование микроплазмы или микропузырей, которые являются центрами рассеяния света [42] и способствуют увеличению оптического пути с ростом поглощения [40]. С учетом этого эффективный коэффициент поглощения µ(I 0 ) определяется следующим образом:…”

Section: метод фиксированного расположения материалаunclassified

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Ограничение Мощности Лазерного Излучения Углеродными Материалами С Нелинейным Оптическим Пороговым Эффектом При Форме Импульса С Плоской Вершиной

Савельев¹,

Василевский²,

Шаман³

et al. 2023

Журнал Технической Физики

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The possibilities of using multivariate determination of carbon nanotubes properties based on the dependence data of the normalized transmission logarithm on the sample displacement in the case of Z-scan with an open aperture as well as on the total pulse energy in the case of fixed sample position measurements are studied. The radiation transfer equation for the threshold dependence of the absorption coefficient on the intensity of a flat-top laser beam is used. The data of physical and computational experiments showed the sensitivity of the measured curves with respect to the values of the constants of the optical and threshold energy fluence, as well as the beam waist radius. The possibility of multivariate determination of the properties of liquid carbon nanotube-based dispersed media with a nonlinear optical threshold effect and beam waist radius inside such samples has been established.

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“…To form a SWCNT/collagen coating on the PET tape, a spin coater (WS-400, Laurell Technologies, North Wales, PA, USA), and an infrared (IR) radiation source (YLR, IRE-Polus, Fryasino, Russia) were used. Recently, optical methods of forming solid biocompatible nanomaterials from liquids have proven themselves well [91,92]. Using a spin coater, a thin layer of dispersion was applied to the PET tape, which was mounted on a spin coater table.…”

Section: Fabrication Of Pet Ligament Implant With Swcnt/collagen Coatingmentioning

confidence: 99%

Frame Coating of Single-Walled Carbon Nanotubes in Collagen on PET Fibers for Artificial Joint Ligaments

Gerasimenko

Zhurbina

Cherepanova

et al. 2020

IJMS

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The coating formation technique for artificial knee ligaments was proposed, which provided tight fixation of ligaments of polyethylene terephthalate (PET) fibers as a result of the healing of the bone channel in the short-term period after implantation. The coating is a frame structure of single-walled carbon nanotubes (SWCNT) in a collagen matrix, which is formed by layer-by-layer solidification of an aqueous dispersion of SWCNT with collagen during spin coating and controlled irradiation with IR radiation. Quantum mechanical method SCC DFTB, with a self-consistent charge, was used. It is based on the density functional theory and the tight-binding approximation. The method established the optimal temperature and time for the formation of the equilibrium configurations of the SWCNT/collagen type II complexes to ensure maximum binding energies between the nanotube and the collagen. The highest binding energies were observed in complexes with SWCNT nanometer diameter in comparison with subnanometer SWCNT. The coating had a porous structure—pore size was 0.5—6 μm. The process of reducing the mass and volume of the coating with the initial biodegradation of collagen after contact with blood plasma was demonstrated. This is proved by exceeding the intensity of the SWCNT peaks G and D after contact with the blood serum in the Raman spectrum and by decreasing the intensity of the main collagen bands in the SWCNT/collagen complex frame coating. The number of pores and their size increased to 20 μm. The modification of the PET tape with the SWCNT/collagen coating allowed to increase its hydrophilicity by 1.7 times compared to the original PET fibers and by 1.3 times compared to the collagen coating. A reduced hemolysis level of the PET tape coated with SWCNT/collagen was achieved. The SWCNT/collagen coating provided 2.2 times less hemolysis than an uncoated PET implant. MicroCT showed the effective formation of new bone and dense connective tissue around the implant. A decrease in channel diameter from 2.5 to 1.7 mm was detected at three and, especially, six months after implantation of a PET tape with SWCNT/collagen coating. MicroCT allowed us to identify areas for histological sections, which demonstrated the favorable interaction of the PET tape with the surrounding tissues. In the case of using the PET tape coated with SWCNT/collagen, more active growth of connective tissue with mature collagen fibers in the area of implantation was observed than in the case of only collagen coating. The stimulating effect of SWCNT/collagen on the formation of bone trabeculae around and inside the PET tape was evident in three and six months after implantation. Thus, a PET tape with SWCNT/collagen coating has osteoconductivity as well as a high level of hydrophilicity and hemocompatibility.

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Spectral analysis combined with nonlinear optical measurement of laser printed biopolymer composites comprising chitosan/SWCNT

Cited by 16 publications

References 47 publications

Reconstruction of Soft Biological Tissues Using Laser Soldering Technology with Temperature Control and Biopolymer Nanocomposites

Reconstruction of Soft Biological Tissues Using Laser Soldering Technology with Temperature Control and Biopolymer Nanocomposites

Ограничение Мощности Лазерного Излучения Углеродными Материалами С Нелинейным Оптическим Пороговым Эффектом При Форме Импульса С Плоской Вершиной

Frame Coating of Single-Walled Carbon Nanotubes in Collagen on PET Fibers for Artificial Joint Ligaments

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