Alumina Substrates Research Articles

Experimental and numerical investigation of the energy absorption in hybrid double-hat thin-walled structures reinforced by adhesive bonding under three-point bending

In this paper, the energy absorption parameters of bolted double-hat joints reinforced by adhesive bonding were investigated. The objective of this article is to leverage adhesive bonding's benefits to reinforce a double hat-shaped aluminum/steel energy absorber, thereby attaining the desired energy absorption characteristics before connection failure. This is achieved without inducing heterogeneous deformations in the structure and simultaneously reducing its overall weight, all while demonstrating superior outcomes compared to conventional methods and reaching the ability to predict adhesive failure in simulations. For this purpose, three different types of specimens were considered: aluminum (both substrates), steel (both substrates), and aluminum-steel (upper: aluminum, lower: steel). These specimens were joined via adhesive and bolt jointing techniques (bolt vs. bolt-adhesive hybrid joint). Experimental data showed that the behavior of the bolt-adhesive aluminum-steel hybrid structure shows the best energy absorption parameters. In order to represent the mechanical responses of the adhesively bonded structure in FEM, a bi-linear CZM was utilized to simulate the failure, indicating a good agreement between experimental and numerical results.

Synthesis and growth mechanism of ZnO nanocandles using thermal evaporation and their efficient CO sensing performance

We report on the single step grown ZnO nanocandles without adding any catalyst for efficient CO gas sensing application. A simple, scalable, and cost-effective thermal evaporation technique was employed for the growth of ZnO nanostructures on alumina substrate at 600 °C. It was observed that oxygen ambient (variation in oxygen flow rates from 20 to 40 sccm) strongly influences the shape and size of the ZnO nanostructures (i.e., the formation of nanocandles or nanorods). The as grown ZnO nanostructures were characterized using various techniques such as X-ray diffraction, Field emission scanning electron microscopy, photoluminescence, and X-ray photoelectron spectroscopy. Further, a comprehensive analysis of the CO gas sensing performance of each sample was recorded under various conditions, and the corresponding mechanism was reported. We have achieved the maximum sensor response (SR%) ∼ 78.3% along with a response/recovery time ∼ 59.5 s/109.4 s towards 91 ppm of CO gas at 400 °C for the sample synthesized at 40 sccm oxygen gas flow rate (i.e., for nanocandles). While, a relatively lower SR ∼ 70.1% and ∼ 64.1% and higher response/recovery time of ∼ 77.8 s/118.6 s and ∼ 84.6 s/122.1 s were obtained for the samples synthesized at 30 sccm and 20 sccm, respectively (i.e., for nanorods). Moreover, the calculated detection limit for ZnO nanocandles was 110 ppb. The selectivity test shows that the ZnO nanocandles are highly responsive to CO gas and exhibits long term stability (tested over 360 days). Thus, ZnO nanocandles can be used for the fabrication of robust CO gas sensors.

Room-temperature SnO2-based sensor with Pd-nanoparticles for real-time detection of CO dissolved gas in transformer oil

SnO2 and Pd nanoparticles (NPs) were synthesized by hydrothermal method and sol-gel, respectively. A paste formed by tin dioxide NP and PVDF was deposited as thick film on alumina substrates through screen printing method and decorated with Pd on surface. The morphology and structure of the samples were investigated by Scanning Electronic Microscopy (SEM), X-Ray Diffraction (XRD) and Raman Spectroscopy. The SEM images show SnO2 nanoparticles with rod shapes and 10–15 nm of diameter size and Pd spherical nanograins with 15–35 nm of diameter. XRD analysis identifies rutile structure for SnO2 powder and cubic structure for Pd NP. To investigate the gas sensing property of the SnO2:Pd nanostructured composite, the electrodes were immersed in an insulating mineral oil, in a closed system where different gas concentration of monoxide carbon (CO) were injected into the headspace and then dissolved into oil, according to Ostwald coefficient. All measurements were carried out at room temperature using a concentration range from 50 to 500 ppm (in headspace). The electric characterization showed that our SnO2-based sensor had change its resistance in a lower concentration of dissolved gas, ∼13.3 ppm of CO, into the mineral oil, indicating its potential use for real time monitoring of transformers.

Slippery surface with ternary coupled structures for improving lubricant-storage capacity

A slippery surface has the capability to protect the substrate surface, which can prevent substrate corrosion in a harsh environment. However, existing slippery surfaces have the limitation of insufficient oil-locking capability for rough structures, which limits their practical application. To solve the aforementioned limitation, the authors developed a slippery surface with a good oil-locking capability. First, a wire-cutting machine tool was used to fabricate ternary coupled grooved structures on an aluminum (Al) substrate, which could increase the lubricant-storage capacity of the microstructures, and the substrate was named slippery porous surface with groove-textured aluminum (Slips-G-Al). Then, a surface durability test was performed involving lubricant shear, sandpaper wear and water impact. The chemical stability test involved acid, alkali, salt corrosion and weather resistance tests, which showed that Slips-G-Al had a good lubricant-storage capacity compared with the traditional Slips surface. In addition, the self-cleaning performance and the fog collection capability of Slips-G-Al were also studied. Finally, an electrochemical corrosion test of Slips-G-Al was carried out. The findings showed remarkable application prospects in the aerospace and shipbuilding fields.

Study on the adsorption characteristics of organic contaminants on alumina surface coated with clean graphene and the influence of amorphous carbon on wetting behavior

This paper investigates the adsorption performance of clean graphene coated on an alumina (Al2O3) substrate towards two common industrial organic contaminants, dibutyl phthalate (DBP), and n-dodecane. The adsorption effects were examined through contact angle measurements. We have observed that the alumina exhibits enhanced adsorption capacity for both organic contaminants, DBP and n-dodecane, after being coated with clean graphene. The presence of graphene significantly enhances the polar component of the surface free energy of alumina, resulting in the extraordinary attraction of the substrate towards the liquids with highly polar components in surface tension. In our experiments, we observed that although graphene was not contaminated by hydrocarbons in the air, the presence of amorphous carbon on its surface still had an impact on the wettability of the substrate. Molecular dynamics simulations are utilized to explore the adsorption behavior of the two organic contaminants on graphene with varying degrees of amorphous carbon present on its surface. The presence of amorphous carbon also reduces the adhesion energy and desorption free energy between organic contaminants and the substrate, weakening the interaction between the liquid and the substrate and increasing the risk of spontaneous desorption. These findings lay the foundation for graphene-based alumina materials in the field of adsorption of organic contaminants.

The study of the anti-icing performance of superhydrophobic silica-nanostructured metal substrates

Superhydrophobic surfaces have proven effective in mitigating ice formation on substrates. This study aimed to experimentally investigate the effects of the surface structure of selected metal substrates on the anti-icing performance. Superhydrophobic surfaces were fabricated on aluminum, copper, stainless steel, and titanium substrates using a spray coating technique with superhydrophobic tridecafluorooctyl triethoxy silane (FAS)-functionalized colloidal silica nanoparticles. The surface wettability, surface morphology, and chemical analysis of the coated surfaces were reported. The results demonstrated successful deposition of silica nanoparticles on all substrates, significantly improving the anti-icing property of the coated surfaces. When compared with uncoated surfaces, the droplet icing times of the coated aluminum plate (C-Al), of the coated copper plate (C-Cu), of the coated stainless steel plate (C-SS), and of the coated titanium plate (C-Ti) significantly enhanced by 751%, 795%, 830% and 1320%, respectively. Also, a heat transfer model was also developed to explain the anti-icing phenomenon.

Preparation of transparent anodic aluminum oxide films and their structural characteristics under thermal shock

Anodic aluminum oxide (AAO) films have a wide range of research and applications in the field of nanoscience and technology. Transparent AAO films require the oxide layer to be peeled off from the aluminum substrate to which it is attached, involving a complex preparation process and immersion in a variety of caustic solutions, resulting in the prepared AAO films that are very prone to fragmentation and unfavorable for applications. Here, we have prepared transparent AAO films by double-sided anodization method with secondary anodization, which consists of a double-sided porous structure spaced with a barrier layer. These transparent AAO films can be bent into bow shape and exhibit good toughness under the action of external forces applied at both ends. Then, the transparent AAO films were subjected to thermal shock experiments, and the changes in the microstructure of the AAO films before and after the thermal shock were analyzed. The relationship between the microstructure of the AAO films and the good toughness they exhibit was also investigated.

Crystallinity evolution of spray pyrolyzed fluorapatite thin films by post-deposition treatment

The stability of fluorapatite (FAP) thin films, which is required for bone ingrowth in FAP-coated bioimplants, improves with crystallinity. To investigate the crystallinity evolution of FAP thin films, they are deposited on titanium and alumina substrates through ultrasonic spray pyrolysis using different deposition arrangements. Two different solutions of pre-synthesized homemade FAP powder and chemical precursors are used for film deposition at different deposition variables. The films are next post-deposition treated in different environments and temperatures up to 1200°C. X-ray diffraction and electron microscopy are employed to study the films' morphology and crystallinity. A thermodynamic simulation software is used to investigate the stability of different phases by the construction of the Ellingham diagram, possible side reactions, and phase decomposition. The study reveals that the high-temperature post-deposition heat treatments do not enhance film crystallinity and CaHPO4 and Ca3(PO4)2 phases are detected. Treatment in argon or evacuated ampoules leads to the formation of titanium oxides due to the substrate's reaction with H2O, a decomposition product of CaHPO4. Furthermore, the oxygen partial pressure employed during the annealing process in evacuated ampoules (1.3 × 10−3 Pa) exceeds the equilibrium value of 1.3 × 10−20 Pa, which promotes substrate oxidation. The use of alumina as a substrate does not improve crystallinity, possibly due to material loss during annealing. Overall, the as-spray-deposited FAP films have better film crystallinity than that achieved with other techniques.

Corrosion resistance and stability of superhydrophobic surfaces with hierarchical micro/nanostructures induced by nanosecond and femtosecond lasers

A innovative approach is introduced to enhance the corrosion resistance and stability of the aluminum (Al) substrates. This method involves the integration of nanosecond and femtosecond lasers (ns-fs-lasers) processing with the silanization treatment procedure. Ns-fs-lasers are employed to generate distinct hierarchical periodic micro/nanostructures, resulting in heightened roughness and micro/nanostructures on the Al surfaces in comparison to single laser texturing. Furthermore, the silanization processes effectively lower the surface free energy of the laser-induced samples. In this study, water contact angles (WCA) and roll angles (RA), as well as electrochemical impedance spectra (EIS) and potentiodynamic polarization (PDP) outcomes, reveal that the surfaces induced by ns-fs-lasers exhibit superior superhydrophobicity, corrosion resistance, and corrosion stability compared to surfaces induced by ns-laser alone. Consequently, the combination of ns-fs-lasers induced surfaces and the silanization process presents a promising avenue for augmenting the corrosion resistance and stability of superhydrophobic Al surfaces.

Numerical Modeling of Critical Velocity and Deformation Behavior in Cold Spray Using Lagrangian and Arbitrary Lagrangian Technique

The cold spraying process is numerically modeled using Lagrangian and Arbitrary Lagrangian Eulerian (ALE) techniques. The simulations were performed to predict the critical velocity of spherical aluminum particles deposited on the aluminum substrate. ALE technique was found to be more suitable than the Lagrangian technique. Using Lagrangian and ALE techniques, the critical velocity for aluminum was predicted as 605 m/s and 770 m/s. Critical velocity was in between 770-775 m/s, as reported in the literature. The Lagrangian technique's capability is limited in capturing large deformations associated with cold spraying. However, this technique requires less computational ability and is quicker than the ALE technique. The jet formation was prominent in the case of the Lagrangian technique, and hence the difference between the numerically estimated value of critical velocity and experimentally measured velocity is more. The Compression ratio was found to increase with an increase in impingement velocity.

Enhanced Corrosion Resistance and Surface Wettability of PVDF/ZnO and PVDF/TiO2 Composite Coatings: A Comparative Study

This study aims to enhance the practical performance of PVDF/ZnO and PVDF/TiO2 composite coatings known for their distinctive properties. The coatings, applied through spray coating with PVDF and ZnO or TiO2 nanoparticles on glass, steel, and aluminum substrates, underwent a comprehensive evaluation. Surface wetting properties and morphology were respectively evaluated using a technique involving liquid droplets and an imaging method using high-energy electrons. Potentiodynamic polarization was used to compare corrosion resistance between coated and bare substrates. Nanoindentation was used to assess coating hardness, and bonding strength was subsequently quantified. The results revealed that PVDF/ZnO composite coatings had higher water contact angles (161 ± 5° to 138 ± 2°) and lower contact angle hysteresis (7 ± 2° to 2 ± 1°) compared to PVDF/TiO2 and PVDF coatings. Moreover, corrosion tests demonstrated superior protection for steel and aluminum surfaces coated with superhydrophobic PVDF/ZnO. Nanoindentation indicated enhanced mechanical properties with TiO2 nanoparticles, with adhesion results favoring TiO2 over ZnO nanoparticles.

Thickness, Adhesion and Microscopic Analysis of the Surface Structure of Single-Layer and Multi-Layer Metakaolin-Based Geopolymer Coatings

This work is focused on creating coating layers made of a metakaolin-based geopolymer suspensions (GP)-formed Al matrix modified using H3PO4 acid with Al(OH)3 in isopropyl alcohol, named GP suspension I, and H3PO4 acid with nano Al2O3 in isopropyl alcohol, named GP suspension J. The selected GP suspensions were applied on aluminum and steel underlying substrates as single-layer coatings and multi-layer coatings, where multi-layer coatings included three and five layers that were polymerized by a curing process. Curing was divided into two types with every layer curing process and final layer curing process. For both GP suspensions I and J, the effect of the number of layers and the type of substrate on adhesion was investigated. The prepared samples on underlying substrates were characterized on the microscopy analysis including SEM for high-resolution images and 3D laser confocal microscopy (CLSM) for the 3D visualization of the coatings structure. Microscopy analysis showed structural defects such as porosity, cracks and peeling, which increase with a greater number of applied layers. However, these defects were only evident on a micro scale and did not seem to be fatal for the performance of the surface stability. The EDS mapping of the prepared layer showed inhomogeneity in the distribution of elements caused by the brush application. A grid test and thickness measurement were performed to complete the microscopy analysis. The grid test confirmed a very high adhesion of GP coatings on the aluminum substrate with a rating of one (only in one case was there a rating of two) and a lower adhesion on the steel substrate with the most frequent rating of three (in one case, there were ratings of two and one). The thickness measurement proved a noticeably thicker thickness of the prepared layer on the Fe substrate compared to the Al substrate by 20%–30% in the case of suspension I and by 70%–10% in the case of suspension J. The thickness of the layer also showed a dependence on the method of application and curing, as a thicker layer was always achieved when curing after the final layer of the GP suspension, compared to curing after each applied layer. The resulting single-layer and multi-layer thicknesses ranged from approx. 7 to 30 µm for suspension I and from approx. 3 to 11 µm for suspension J. A non-linear increase in thickness was also evident from the thickness measurement data.

Impact of O2/Ar gas ratio on the DC reactive magnetron sputtered NiO thin films for ultrafast detection with high sensitivity and selectivity towards H2S gas

H2S is one of the most hazardous gases, causing several serious health consequences. In the present work, room temperature DC reactive magnetron sputtered NiO thin films were prepared on alumina substrate to detect H2S gas. The O2/Ar gas ratio (10 % and 20 %) influenced the presence of defects (Ni3+/Ni2+) as investigated by XPS studies, and had a substantial impact on the H2S gas sensing performance. The NiO thin film deposited at 20 % O2/Ar ratio exhibited highly improved sensing compared to the film deposited at 10 % O2/Ar ratio. The highest SR ∼14.8 at 350 °C with an ultrafast response time (35s)/recovery time (14s) was achieved for the NiO thin film prepared at 20 % O2/Ar ratio towards 100 ppm H2S gas. An excellent SR ∼5.8 was obtained at a relatively low Top of 175 °C. Further, the high sensitivity and selectivity of NiO thin films make them a prospective material for low ppm (∼3 ppm) H2S gas detection.

Innovative Solid Slippery Coating: Uniting Mechanical Durability, Optical Transparency, Anti-Icing, and Anti-Graffiti Traits.

Slippery coatings, such as the slippery liquid-infused porous surface (SLIPS), have gained significant attention for their potential applications in anti-icing and anti-fouling. However, they lack durability when subjected to mechanical impact. In this study, we have developed a robust slippery coating by blending polyurethane acrylate (PUA) with methyltriethoxysilane (MTES) and perfluoropolyether (PFPE) in the solvent of butyl acetate. The resulting mixture is homogeneous and allows for uniform coating on various substrates using a drop coating process followed by drying at 160 °C for 3 h. The cured coating exhibits excellent water repellency (contact angle of ~108° and sliding angle of ~8°), high transparency (average visible transmittance of ~90%), exceptional adherence to the substrate (5B rating according to ASTMD 3359), and remarkable hardness (4H on the pencil hardness scale). Moreover, the coating is quite flexible and can be folded without affecting its wettability. The robustness of the coating is evident in its ability to maintain a sliding angle below 25° even when subjected to abrasion, water jetting, high temperature, and UV irradiation. Due to its excellent nonwetting properties, the coating can be employed in anti-icing, anti-graffiti, and anti-sticking applications. It effectively reduces ice adhesion on aluminum substrates from approximately 217 kPa to 12 kPa. Even after 20 cycles of icing and de-icing, there is only a slight increase in ice adhesion, stabilizing at 40 kPa. The coating can resist graffiti for up to 400 cycles of writing with an oily marker pen and erasing with a tissue. Additionally, the coating allows for easy removal of 3M tape thereon without leaving any residue.

Corrosion resistance and microstructural characterization of Ti-Zr-V/waterborne resin composite conversion coating on 1060 aluminum alloy

A Ti-Zr-V/waterborne resin composite conversion coating (TZVRC) was prepared on an aluminum substrate using a simple and environmentally friendly coated-bake, non-washing one-step film-forming method. Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves, neutral salt spray (NSS) testing, and scanning electron microscopy (SEM) results indicated that TZVRC exhibited the best corrosion resistance and topcoat adhesion when the concentration of sodium orthovanadate in the composite conversion solution was 1 g/L. It also exhibited a relatively uniform and dense microstructure. The corrosion resistance of the coating is comparable to traditional chromate conversion coatings. The corrosion current density (icorr) is 0.1426 μA/cm², the corrosion rate is 0.0015 mm/year, the coating resistance (Rc) reaches 384 kΩ·cm², and the coating thickness is approximately 0.4 µm. Attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) analysis revealed that the upper part of the coating primarily consisted of cured waterborne resin, while the bottom part was mainly composed of insoluble inorganic substances. Additionally, there were concentration gradient variations in the distribution of inorganic components within the lower part of the coating. Near the interface between the aluminum substrate and the bottom of the coating, the main components were Al, AlPO4, Al2O3, and AlF3, while the upper layer of the inorganic substances primarily consisted of TiO2, ZrO2, complexes of V ions, AlPO4, Al2O3, and AlF3. This composite conversion coating not only possesses excellent corrosion resistance but also eliminates the post-film washing step, streamlining the process. Additionally, the composite conversion system, which combines waterborne resin with inorganic components, offers a potential solution for the integration of chemical conversion coatings and primers on aluminum surfaces.

Microstructural and Tribological Characteristics of Composites Obtained by Detonation Spraying of Iron-Based Alloy-Carbide Powder Mixtures.

iron-based coatings have exhibited good mechanical properties, such as high hardness and good wear resistance, which are desirable properties in applications such as automobile brake rotors. iron-based coatings are also good replacements for Co- and Ni-based coatings, which are costly and could have health and environmental concerns due to their toxicity. In this research, three different iron-based coatings were deposited using the Detonation Gun Spraying (DGS) technology onto aluminum substrates, including the steel powders alone (unreinforced), and steel powders mixed with Fe3C and SiC particles, respectively. The microstructural characteristics of these coatings and mechanical properties, such as hardness and wear resistance, were examined. The morphology and structure of the feedstock powders were affected by the exposure to high temperature during the spraying process and rapid solidification of steel powders that resulted in the formation of an amorphous structure. While it was expected that steel particles reinforced with hard ceramic particles would result in increased hardness, instead, the unreinforced steel coating had the highest hardness, possibly due to a higher degree of amorphization in the coating than the other two. The microstructural observation confirmed the formation of dense coatings with good adhesion between layers. All samples were subjected to ball-on-disk wear tests at room temperature (23 °C) and at 200 °C. Similar wear resistances of the three samples were obtained at room temperature. At 200 °C, however, both ceramic reinforced composite samples exhibited higher wear rates in line with the reduction in their hardness values. This work explains, from the microstructural point of view, why adding hard particles to steel powers may not always lead to coatings with higher hardness and better wear resistance.

Enhanced alumina substrate wear resistance via electroless NiP–TiC nanocomposite coating

In this research, several NiP–TiC nanocomposite coatings on alumina substrate were deposited via electroless nickel-phosphor plating methods under various deposition conditions. Field emission scanning electron microscope (FESEM) images show that different coating morphologies have been produced. The energy-dispersive x-ray spectroscopy (EDX) data demonstrate that the nanoparticles were successfully integrated and nickel and phosphorus are the principal components of the coating. The Nickel peaks have been noticed at an angle around 44⁰ which belongs to Ni (111) using an X-ray diffraction analysis (XRD) pattern for NiP–TiC nanocomposite coating at different immersion times and temperatures. According to the contact angle data, the nanocomposite coating created at (30 min at 95 °C) exhibited the best hydrophobic qualities and had a maximum contact angle value of 118.11°. The corrosion behavior was studied via the electrochemical method in 3.5 wt% NaCl at 25 °C, and the results showed that to get the best polarization resistance for the NiP–TiC coating, (60 min at 85 °C) deposition conditions are more suitable to get compact coating covering the full substrate and is 31 kΩ cm. For the best hardness value coating with multi-small nodules with high incorporation particle level can be obtained at (30 min and 95 °C) and is 7.98 GPa. Finally, the lower wear rate was collected for the coating plating at (90 min at 95 °C) deposition conditions because it has the least coefficient of friction.

Enhancing the ballistic resistance of steel/aluminum bilayer armor plates through explosive welding

This work presents a comprehensive analysis of the ballistic response of Q235 steel/6061-T6 aluminum bilayer plates fabricated via explosive welding, with a special focus placed on elucidating the mechanisms of ballistic resistance enhancement due to the bonded interface. For comparison purposes, unbonded Q235 steel/6061-T6 aluminum bilayer plates (e.g. being stacked together or spaced with an air gap) were also investigated. Ballistic tests were carried out to compare the residual velocities and failure behaviours of the welded and unwelded bilayer plates. Computational models were built in LS/DYNA and validated with the experiment. Experimental results showed that the ballistic limit velocity of the explosively-welded plate is 13.4% and 9.4% higher than those of the in-contact plate and air-gapped plate. Simulation results suggested that the enhanced ballistic resistance was attributed to its welded interface. On the one hand, the welded interface allowed effective stress attenuation within the steel layer leading to a greater damage tolerance and more energy dissipation during the prolonged response time. On the other hand, when deforming together with the steel layer, the welded interface enforced a uniform indentation on the central region of the aluminum substrate leading to greater energy absorption due to compression and thinning of the material.

Enhanced corrosion resistance of ammonium heptamolybdate (AHM) sealed Li[sbnd]Al LDHs conversion coating on aluminum alloy

In this study, we prepared a hierarchical structured coating via a versatile two-step approach for the protection of 6N01 aluminum alloy. On the basis of as-prepared secondary alkane sulphonate (SAS) modified LiAl LDHs conversion coating (SLDH) by in-situ synthesis method, ammonium heptamolybdate (AHM) was introduced in the post-treatment to fabricate AHM@SLDH with enhanced corrosion resistance. The surface morphology, chemical composition and corrosion performance are characterized by means of scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), etc. The hybrid coating has a persistence corrosion resistance in 3.5 wt% NaCl aqueous solution with protective efficiency of 99.64 %. As a highlight, a self-repairing function is detected in the immersion test, which is attributed to the weak oxidation function of Mo (VI). We believe that AHM@SLDH in-situ grown on aluminum substrate can provide a promising route for its corrosion prevention.

Использование смартфона в твердофазно-флуориметрическом определении некоторых полипептидных антибиотиков в лекарственных препаратах

The analysis of semi-products at different stages of production and finished medicinal products is an integral part of an effective quality assurance system for pharmaceutical production. The traditional methods used in the pharmaceutical field, such as capillary electrophoresis, gas and liquid chromatography, are quite versatile and effective. However, they are distinguished by the high cost of instrumentation and component materials, the need to use high-purity solvents, the lack of mobility and the possibility of in situ studies. Such shortcomings can be overcome by using the digital colorimetry method. Its significant popularization has been facilitated by the development of portable and personal electronic devices, among which the smartphone can be distinguished. The aim of the work was to develop a fast and simple method for the determination of a number of polypeptide antibiotics in drugs by digital colorimetry using a smartphone as a color recording device. To implement the solid phase fluorimetric determination of polypeptide antibiotics, HPTLC plates based on silica gel with an aluminum substrate were used as a matrix. Under these conditions, the fluorescence of actinomycin D, virginiamycin M1, virginiamycin S1, and novobiocin was observed when exposed to monochromatic radiation in the UV part of the spectrum (365 nm). The measurement of fluorescence intensity on the surface of the matrices was carried out using a smartphone. Calibration characteristics were constructed for the determination of polypeptide antibiotics in the concentration range of 32–500 μg/mL. The method for assessing the quality of finished drugs was tested on commercial products “Piostacin”, “Cosmegen”, “Dactinomycin” purchased in retail chains. The relative standard deviation of the analysis results does not exceed 0.05. The duration of the analysis was 10–15 min. Based on the results of the studies, the paper presents a method for determining some antibiotics of the polypeptide series by the intrinsic fluorescence of deposited solutions on a solid substrate during treatment with monochromatic UV radiation. The experimental delivery conditions used allow the analysis of drugs based on actinomycin D, virginiamycin M1, virginiamycin S1, and novobiocin.