16 results about "Digital Light Processing" patented technology

This invention discloses a droplet microarray chip based on molecular logic operations and its construction method, belonging to the field of biochemical analysis and detection technology. It includes a substrate layer, a functional layer on the substrate layer, and molecular logic circuitry. The functional layer is a superhydrophilic-superhydrophobic patterned porous polymer film prepared in situ on the substrate using digital light processing technology, followed by PFOC acylation. The superhydrophilic-superhydrophobic patterned porous polymer film contains arrayed superhydrophilic microreaction units, separated by superhydrophobic polymer regions. Each superhydrophilic microreaction unit encapsulates an independent microdroplet, and the molecular logic circuitry is encapsulated within each independent microdroplet. This invention, through the combination of droplet microarray chip and molecular logic circuitry, achieves systematic improvements in multi-enzyme synergistic detection capabilities, logic computation complexity, spatial isolation control, high-throughput analysis, and adaptation to biological environments.

This invention belongs to the field of polymer materials and 3D printing technology, and particularly relates to a photocurable 3D printing bio-based resin, its preparation method, and its applications. By weight, the resin is mainly composed of 50-70 parts of a photosensitive resin prepolymer matrix, 30-50 parts of the reactive diluent hydroxyethyl methacrylate (HEMA), and 1-5 parts of a photoinitiator. The prepolymer matrix is ​​prepared by ring-opening esterification of malic acid and citric acid with glycidyl methacrylate (GMA) through a specific step-temperature controlled process, followed by the compounding of precisely synthesized photosensitive malic acid monomer (MG) and photosensitive citric acid crosslinking agent (CG). This invention utilizes HEMA to effectively break the large molecular hydrogen bond network between prepolymers, achieving an effective reduction in resin viscosity while maintaining a high bio-based content. The resin of this invention exhibits low viscosity, rapid photoresponse, high double bond conversion rate, and excellent curing heat stability, making it highly suitable for stereolithography (SLA), digital light processing (DLP), and applications in electronic packaging and electromagnetic shielding.

This invention discloses a photocuring process visualization ink composition, comprising a photocrosslinkable precursor component, a photoinitiator component, and a free radical indicator. During photocuring, the free radical indicator reacts with free radicals generated by the photoinitiator under photoexcitation, changing from one color state to another. The light absorption peak of the free radical indicator is spectrally separated from the excitation wavelength of the photoinitiator. This invention also discloses a method for visualizing the photocuring process using the above composition and an additive manufacturing process with visualization monitoring capabilities. The method described in this invention is compatible with most photocuring systems based on free radical polymerization mechanisms, and the monitoring process is applicable to various photo-based 3D printing technologies such as volumetric additive manufacturing, digital light processing, and stereolithography, providing a material and methodological basis for process visualization and closed-loop control in bio-3D printing.

The application discloses a large-format gray-scale image line-by-line rolling exposure method and system based on DLP projection and relates to the technical field of digital light processing additive manufacturing. The application aims at the problems of existing large-format splicing technology, such as forming defects, low gray-scale modulation efficiency of traditional line-by-line exposure, and strong binding between display line number and gray-scale output, maps and expands 8-bit original gray-scale values into 11-bit expanded gray-scale values through a gray-scale stretching algorithm of an upper computer, and decomposes the 11-bit expanded gray-scale values into bit plane data, combines DDR dynamic data scheduling and BLOCKRAM cache incremental update logic based on bit plane weight at an FPGA end, and realizes time domain cumulative exposure of pixel gray-scale values. The application can realize seamless printing of 256 gray scales under any effective display line number, greatly improves exposure efficiency, eliminates splicing defects, and improves system flexibility and stability.

This invention relates to the field of digital light processing (DLP) technology, specifically a method for preparing ceramic-bonded diamond grinding blocks with piezoelectric effect. The method uses lead zirconate titanate-based piezoelectric powder, diamond powder, and a glassy phase as raw materials to prepare a ceramic-bonded diamond composite powder. A slurry is prepared by mixing photosensitive resin, organic solvent, and dispersant. The composite powder is then slowly added to the slurry and dispersed at high speed to prevent particle agglomeration. Vacuum degassing is then performed to obtain a uniform and stable composite slurry. A green grinding block is obtained by photopolymerization 3D printing, followed by debinding and high-temperature sintering. Finally, the sintered green block undergoes polarization treatment to achieve piezoelectric orientation of the lead zirconate titanate phase, resulting in a ceramic-bonded diamond grinding block with both high hardness and piezoelectric effect. This method offers controllable process control and high forming precision. The prepared grinding block can utilize the piezoelectric effect to achieve self-monitoring and self-excitation functions, making it suitable for precision and efficient grinding.

Methods, systems, apparatuses, and computer program products are described herein for printing artificial constructs or tissue models from a bioink using digital light processing (DLP). Bioinks can include polyethylene glycol diacrylate (PEGDA), gelatin methacrylate (GelMA), hyaluronic acid methacrylate (HAMA), lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP), tartrazine, arginine-glycerine-aspartic acid (RGD), isoleucine-lysine-valine-alanine-valine (IKVAV), and Dulbecco's Phosphate-Buffered Saline (dPBS) pH buffered with calcium and magnesium. Such bioinks can result in printed constructs that exhibit improved vascularity / perfusability and improved stem cell growth and regulation. Bioink can be formed by vortexing a solution of PEGDA, GelMA, HAMA, LAP, tartrazine, RGD, IKVAV, and / or dPBS at a temperature of, e.g., about 60°C or greater. DLP bioprinting can be carried out layer-by-layer with an average thickness of each layer being between about 25 µm and about 100 µm. Average light intensity emitted during DLP bioprinting can be between about 10 mW / cm2 and about 30 mW / cm2.

The application provides a gelatin-based bio-ink for digital light processing, which comprises a gelatin-ureidopyrimidinone polymer GelMA-UPy, a photoinitiator, a light absorber and a solvent; wherein the GelMA-UPy is prepared by reacting methylacrylic anhydride gelatin GelMA with 2-(6-isocyanohexylaminocarbonylamino)-6-methyl-4[1H]pyrimidine UPy-NCO; the application introduces the UPy group into the methylacrylic anhydride gelatin in the form of a group, so that the gelatin-based bio-ink has reversible quadruple hydrogen bonds, that is, a dynamic bond; and due to the fact that the UPy is easy to form a dimer, a dynamic network structure is formed at a micro level; the introduction of the dynamic network makes the gelatin-based bio-ink change from the original pure chemical crosslinking structure to a structure in which the chemical crosslinking and the dynamic network coexist, which is of great help to solve the defects of the gelatin-based bio-ink in the application of the digital light processing technology.

The application discloses a reconfigurable 3D printing liquid crystal elastomer composition based on RAFT, which comprises liquid crystal monomers, chain extenders, RAFT chain transfer agents and free radical photoinitiators, wherein the RAFT chain transfer agent is BPCT. Relying on the dynamic exchange characteristics of the trithiocarbonate BPCT, the application realizes the spatial selective programming, erasing and reprogramming of the orientation of liquid crystal units in the LCEs network, and solves the problem that the current existing reconfigurable LCEs and commercial digital light processing 3D printing technologies are difficult to be integrated due to the incompatibility of dynamic chemistry. The application provides an efficient and robust strategy for the preparation of a reconfigurable soft driver.

The present invention relates to a microfluidic device comprising a main chamber configured to have a ring-like shape, at least one cell introduction port in fluidic connection with the main chamber, and at least one test port in fluidic connection with the main chamber. The present invention also relates to a method of producing the microfluidic device using digital light processing 3D printing, as well as methods and uses of the device for culturing cells and for generating bone micro tissue.

The application discloses a method for preparing an alumina-based ceramic based on a 3D printing process. The method comprises the following steps: preparing Ce-loaded polylactic acid (Ce-PLA) particles by adopting an emulsion-solvent evaporation method; then, TiO2 and the Ce-PLA particles are ball-milled at low temperature to obtain TiO2-Ce-PLA composite powder; the TiO2-Ce-PLA composite powder is mixed with alpha-Al2O3 powder, photosensitive resin, a photoinitiator and a dispersing agent in sequence to obtain ceramic slurry; the ceramic slurry is printed by adopting a digital light processing technology to obtain a green body; and after the green body is subjected to ultraviolet light irradiation, degreasing and sintering treatment, the alumina-based ceramic is obtained. The alumina-based ceramic prepared by the method has an open porosity of 41.3% to 43.1% and a bending strength of 93.39 to 97.98 MPa, and is suitable for manufacturing ceramic cores for hollow blades of an aero-engine.

The present application relates to the technical field of 3D printing precision improvement method, more specifically to a digital light processing 3D printing precision improvement method based on random forest algorithm. For the reverse design strategy based on interpretable learning, the parameter backstepping and optimization under the target curing precision are realized by adopting the following scheme: measuring under different exposure times, fitting the curve according to the Jacob work curve equation; changing I, calculating the under different light intensity; designing a test structure to quantify the printing effect under different parameters; selecting appropriate parameter range for printing; observing and measuring the size through a microscope, and constructing a data set; linearly normalizing the data set, and dividing it into a training set and a test set in proportion; training a random forest model. The optimal printing parameters are obtained by using the trained model, and printing is carried out, the printed structure size is measured and added to the data set, the model is retrained until the key size error meets the standard.

This invention discloses a method for preparing lignin-carbon quantum dot luminescent ink, the ink itself, and its applications. This ink possesses excellent fluorescence properties, printability, and environmental friendliness. 0.07-0.15 parts by weight of lignin and 0.4-0.8 parts by weight of ethylenediamine are dissolved in 10-15 parts by weight of deionized water. After stirring and ultrasonic dispersion, the mixture is subjected to a hydrothermal reaction at 140-160°C for 6-8 hours. After cooling, the supernatant is collected to obtain a lignin-carbon quantum dot (LCQD) dispersion. This dispersion is mixed with an aqueous photocurable resin and a photoinitiator, stirred until homogeneous, and the viscosity is adjusted to obtain a photocurable 3D-printable luminescent ink. After being printed using digital light processing (DLP) or other photocurable 3D printing technologies, this ink can produce complex decorative logos with stable luminescence effects. Under ultraviolet light excitation, it exhibits bright blue fluorescence and has application potential in personalized decoration, smart signage, and artistic design.

This invention discloses a digital light-processing 3D printing photocurable resin composition, its printing method, and its applications. The digital light-processing 3D printing photocurable resin composition includes a crosslinking agent, a monomer, a chain transfer agent, and a photoacid. By introducing a thioacetal compound as a chain transfer agent, this invention constructs a photoinitiated cationic degenerate chain transfer polymerization system under the action of a photoacid catalyst, achieving active / controllable regulation of the polymerization process. The photocurable resin composition provided by this invention has a simple composition, requires no complex synthetic reagents, and can fundamentally eliminate oxygen inhibition, achieving rapid and high-precision 3D printing with a maximum printing resolution of 57 μm.