Transparent Matrices Research Articles

Influence of Metal versus Transparent Matrices on Proximal Contact Tightness of Class II Bulk-fill Composite Restorations

Purpose: This study investigated the effect of metal versus transparent matrix systems on proximal contact tightness (PCT) of class II bulk-fill composite resin restorations. Methods: 80 Ivorine teeth with standardized MO cavity preparations were randomly divided into 4 equal groups (n=20). Group1; sectional metal matrix, group2; pre-contoured circumferential metal matrix in a Tofflemire retainer, group3; conventional metal matrix in a Tofflemire retainer, and group4; Blue Cure-Thru transparent contoured matrix band. All matrices were combined with a separation ring and secured with wooden wedges. Cavity preparations were restored with bulk-fill composite resin; SonicFill 2 with the corresponding bonding system following manufacturer’s instructions. Composite material cured for 20s using Elipar S10 light curing unit. Teeth were restored in a clinically relevant situation using KaVo manikin head. After matrix and wedge removal, proximal contact tightness was measured using the Tooth Pressure Meter. Means were calculated and data were statistically-analyzed using ANOVA and Tukey’s test (p<.05). Results: Means and standard deviation for proximal contact measurements were: 7.62 (.52), 4.01 (.74), 4.13 (.4) and 2.74 (.37) for groups 1, 2, 3 and 4 respectively. There was a statistical significant difference among all groups except between group2 and 3. Conclusions: Under the conditions of this test, it can be concluded that: 1. Proper proximal contact tightness for bulk-fill posterior composite restorations could be produced by sectional metal matrix rather than transparent matrix. 2. Pre-contoured circumferential metal matrix produced the same proximal contact tightness as conventional metal matrix when both used with a separation ring.Keywords: Bulk-fill Composite, Proximal Contact Tightness, Dental Matrices, Tooth Pressure Meter. Clinical Relevance Transparent matrices couldn’t be recommended for bulk-fill posterior composite restorations rather than metal matrices.

Optical detection of different phenolic compounds by means of a novel biosensor based on sol-gel immobilized laccase.

A novel sol-gel-based biosensor exploiting the optical absorption properties of sol-gel immobilized laccase has been constructed to increase enzyme specificity toward different phenolic substrates. Laccase from Trametes versicolor has been immobilized in optically transparent sol-gel matrices. Using Fourier transform infrared spectroscopy and data analysis based on a wavelet algorithm, a successful enzyme immobilization has been determined. The changes in the optical absorption spectra of laccase reaction products at 425, 375, and 400nm have been used to determine hydroquinone, resorcinol, and catechol concentrations, respectively. Owing to the slow response time of the hydroquinone-laccase reaction, our optical biosensor has been tested with resorcinol and catechol. Linear ranges up to 1.4 and 0.2mM, limit-of-detection (LOD) of 4.5 and 0.6μΜ, have been evidenced for resorcinol and catechol, respectively. Data for determining the resorcinol concentration have been particularly interesting since no other biosensor device has been reported in the literature. In comparison with other biosensors using laccase from the same native source, our biosensor has been characterized by larger linear ranges, significant sensitivities, and good LODs. To challenge our biosensor with real samples, tap water samples spiked with known amount of catechol and resorcinol have been employed.

The influence of temperature on the optical properties of gold nanoparticles

The optical properties of gold nanoparticles in a transparent matrix are studied at temperatures from 300 to 1000 K within the spectral range from 450 nm to 1.5 μm. It is shown that, in the case of small nanoparticles and short wavelengths in the plasmon resonance band, an increase in temperature leads to a decrease in the absorption efficiency factor. The light absorption efficiency factor of gold nanoparticles with a radius exceeding 40 nm increases with increasing temperature in the entire spectral range studied. The single scattering efficiency factor always decreases with increasing temperature. The effects observed are related to a change in the refractive indices of gold and the matrix with comparable contributions. It is shown that results of calculations agree qualitatively with available experimental data. The results are necessary to optimize the composition of the actuators, including gold nanoparticles, in the transparent matrices.

Effect of MDP-containing Silane and Adhesive Used Alone or in Combination on the Long-term Bond Strength and Chemical Interaction with Lithium Disilicate Ceramics.

To evaluate the effect of a silane and an adhesive containing MDP, used alone or combined in the same solution, on the microshear bond strength (μSBS) to lithium disilicate ceramics immediately and after 1-year water storage, and compare the bond strength results with the Raman spectra of the treated lithium disilicate surfaces. A total of 30 CAD/CAM blocks of lithium disilicate (LD; IPS e.max CAD) were cut into four square sections (6 x 6 x 6 mm; n = 60 per group) and processed as recommended by the manufacturer. The LD specimens were divided into 12 groups according to the following independent variables: silane coupling agent (no silane; silane without 10-MDP [MBS, Monobond S]; silane with 10-MDP [MB+, Monobond Plus]) and adhesive + luting composite (no adhesive + Enforce; no adhesive + RelyX Ultimate; Prime & Bond Elect [PBE], a silane- and MDP-free universal adhesive + Enforce; Scotchbond Universal Adhesive [SBU], a silane- and MDP-containing universal adhesive + RelyX Ultimate). After each treatment, cylindrical, transparent matrices were filled with a luting composite and light cured. Specimens were stored in water (37°C for 24 h or 1 year) and submitted to the microshear bond strength (μSBS) test. The failure pattern and μSBS were statistically evaluated (α = 0.05). In addition, specimens were examined for chemical interaction using Raman spectroscopy. The use of the adhesive PBE alone showed higher mean μSBS compared with both groups with silane (MSB or MB+) without PBE (p < 0.001) at 24 h. The use of the SBU adhesive or MBS silane alone, as well as MB+ associated with SBU, showed higher mean μSBS (p < 0.001) at 24 h. After 1-year water storage, all groups showed a significant decrease in mean μSBS. However, the application of PBE or SBU associated with MB+ silane showed higher 1-year mean μSBS (p < 0.001). In terms of chemical interaction, when silane (MSB or MB+) was applied, only a slight decrease of Si-O peaks occurred. Otherwise, when PBE or SBU adhesives were applied, methacrylate peaks were only observed in the SBU groups. The best results in terms of bond strength after water storage were obtained when an MDP-containing silane was associated with a universal adhesive. The use of a simplified bonding protocol that includes either a silane or a universal adhesive is not recommended.

Influence of Temperature on Optical Properties of Silver Nanoparticle–Transparent Matrix Composites

Individual optical properties of silver nanoparticles and their composites with transparent matrices were calculated at wavelength 1060 nm and various temperatures. It was shown that the absorption coefficient of the nanoparticles depended almost linearly on temperature whereas the scattering efficiency and anisotropy depended weakly on temperature. The coefficients of reflectance and transmission of a slab decreased and the effective absorption coefficient increased as the temperature increased. The studied trends could be used to obtain temperature dependences of metal optical properties.

Testing Novel Anti - Multiple Myeloma (MM) Agents in a Suitable Three-Dimensional (3D) Co-Culture Platform

Introduction: In the past several years significant progress has been made in the understanding of MM pathogenesis, drug resistance and the related role of the bone marrow microenvironment (BMM). Hence various treatment strategies are currently in (pre-) clinical use, targeting both malignant plasma cells and the BM niche. In February 2015 the first epigenetic modifying pan histone deacetylase inhibitor (HDACi), panobinostat, granted approval for relapsed or refractory MM. However there is insufficient data so far to conclusively unravel the complex interactions between "epi-drugs" and the rapid increasing number of antimyeloma agents. Thus, we assess the impact of novel drug combinations (NOX-A12, auranofin, class selective HDACis, Sirt-2 inhibitors) on the BMM in a suitable matrix-based 3D co-culture platform to best mimic in vivo conditions whilst ensuring easy handling.Methods: The innovative 3D co-culture platform is based on transparent agarose matrices with 2 mm deep conical micro-cavities, wherein semi-adherent cell populations can be either seeded in contact or distance co-culture (Fig. 1). Due to the uniquely defined conical shape of the cavities, proliferation as well as treatment response could be monitored up to several weeks by determining the circular area of the cell clusters via transmitted light scanner. To further compare common flat 2D versus 3D culturing with regard to treatment response and growing behavior, FACS analysis and viability assays were performed. In addition, we examined altered expression levels of adhesion molecules (CXCR4, CD138, CD38, Slam-F7) in terms of culture conditions and epigenetic modulations (class-selective HDACis) using multi-panel flow cytometry. Qualitative and quantitative distribution of fluorescence dyes (apoptosis, proliferation) inside the cell agglomerations was visualized using mCherry transduced RPMI-8226 cells combined with confocal imaging and ScanR-analysis.Results: Human MM cell lines (MMCLs; U266 and RPMI-8226) exhibited substantial differences concerning growth and therapeutic responses under 2D versus agarose-based 3D culture conditions. MMCLs and especially primary MM patient samples could be cultured without reconditioning steps for more than three weeks under moderate logarithmic growth conditions inside the agarose matrices. Due to simple media and/or stromal exchange a loss or dying of cells could be consistently avoided. In contrast semi-adherent MMCLs (initial concentration 105 cells/ml) showed exponential proliferation in common flat culture until nutrient starvation induced apoptosis after approx. six days. Furthermore, malignant plasma cells became significantly resistant to proteasome inhibitors (PI) bortezomib (BTZ; 6nM, 48h) and auranofin (AUR; 3 µM, 48h) by forming solid 3D cell-agglomerations and almost remained unaffected if co-cultured additionally with HS-5 BM stromal cells (BMSCs). To exclude uneven distribution of agents, we determined the equal penetration of fluorescent dyes (CellTrace Violet/CFSE) into cell-clusters via confocal imaging.Further data suggest a great impact of 3D co-culture conditions on the expression pattern of modern target structures per se, leading e.g. to a decrease in CXCR4 but persistence of CD138 levels if compared to 2D mono-culture. Moreover we demonstrated a significant decrease of CD138 in low toxic concentrations of panobinostat (8nM, 48h) indicating a intriguing modulation of the BMM by epigenetic modifying agents. For subsequent steps we already verified synergistic antimyeloma effects of the novel HDAC6-selctive inhibitor JS28 in combination with BTZ and aim to further elucidate the influences of various selective deacetylase inhibitors on the BM niche.Conclusions and Ouline: Our recent data underline the importance of accurate 3D co-culture models to mimic in vivo proliferation and drug resistance and to predict later clinical treatment success more precisely. Based on this suitable platform, we are currently assessing the impact of cluster formation, stromal support and "epi-drugs" on the expression pattern of adhesion molecules to derive most rational drug combinations with modern target structures, such as CXCR4, CD138, CD38 and SlamF7 and to allow more effective targeting of the BMM. [Display omitted] DisclosuresEngelhardt:Janssen: Research Funding; MSD: Research Funding; Amgen: Research Funding; Celgene: Research Funding.

In vitro characterization of electrochemically compacted collagen matrices for corneal applications

Loss of vision due to corneal disease is a significant problem worldwide. Transplantation of donor corneas is a viable treatment option but limitations such as short supply and immune-related complications call for alternative options for the treatment of corneal disease. A tissue engineering-based approach using a collagen scaffold is a promising alternative to develop a bioengineered cornea that mimics the functionality of native cornea. In this study, an electrochemical compaction method was employed to synthesize highly dense and transparent collagen matrices. We hypothesized that chemical crosslinking of electrochemically compacted collagen (ECC) matrices will maintain transparency, improve stability, and enhance the mechanical properties of the matrices to the level of native cornea. Further, we hypothesized that keratocyte cell viability and proliferation will be maintained on crosslinked ECC matrices. The results indicated that uncrosslinked and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide–N-hydroxysuccinimide (EDC–NHS) crosslinked ECC matrices were highly transparent with light transmission measurements comparable to native cornea. Stability tests showed that while the uncrosslinked ECC matrices degraded within 6 h when treated with collagenase, EDC–NHS or genipin crosslinking significantly improved the stability of ECC matrices (192 h for EDC–NHS and 256 h for genipin). Results from the mechanical tests showed that both EDC–NHS and genipin crosslinking significantly improved the strength and modulus of ECC matrices. Cell culture studies showed that keratocyte cell viability and proliferation are maintained on EDC–NHS crosslinked ECC matrices. Overall, results from this study suggest that ECC matrices have the potential to be developed as a functional biomaterial for corneal repair and regeneration.

Optical properties of graphene-based materials in transparent polymer matrices

Different aspects of graphene-based materials (GBMs) and GBM-nanocomposites have been investigated due to their intriguing features; one of these features is their transparency. Transparency of GBMs has been of an interest to scientists and engineers mainly with regard to electronic devices. In this study, optical transmittance of structural, purpose-made nanocomposites reinforced with GBMs was analyzed to lay a foundation for optical microstructural characterization of nanocomposites in future studies. Two main types of GBM reinforcements were studied, graphene oxide (GO) and graphite nanoplates (GNPs). The nanocomposites investigated are GO/poly(vinyl alcohol), GO/sodium alginate, and GNP/epoxy with different volume fractions of GBMs. Together with UV-visible spectrophotometry, image-processing-assisted micro and macro photography were used to assess the transparency of GBMs embedded in the matrices. The micro and macro photography methods developed were proven to be an alternative way of measuring light transmittance of semi-transparent materials. It was found that there existed a linear relationship between light absorbance and a volume fraction of GBMs embedded in the same type of polymer matrices, provided that the nanocomposites of interest had the same thicknesses. This suggests that the GBM dispersion characteristics in the same type of polymer are similar and any possible change in crystal structure of polymer due to different volumetric contents of GBM does not have an effect on light transmittance of the matrices. The study also showed that the same types of GBMs could display different optical properties in different matrix materials. The results of this study will help to develop practical microstructural characterization techniques for GBM-based nanocomposites.

A Facile Method for the Synthesis Fluorescent Zinc Chalcogenide (ZnO, ZnS and ZnSe) Nanoparticles in PS and PMMA Polymer Matrix.

A simple method for the synthesis of fluorescent zinc chalcogenide (ZnO, ZnS and ZnSe) nanoparticles directly in the transparent PMMA and PS polymer matrices were reported. Highly dispersed small spherical ZnO nanoparticles (3-5nm) was obtained by hydrothermal reaction of PMMA/PS-Zn(acac)2H2O in toluene. ZnS and ZnSe nanoparticles were prepared by heterogeneous stirring of PMMA/PS-Zn(acac)2H2O in toluene with aqueous solution of thiourea or NaHSe. Interestingly, ZnO and ZnS-PMMA thin film showed strong fluorescence quenching upon exposure to ammonia.

Determining the optical properties of light-diffusing systems using a photometric sphere

A facility based on a photometric sphere has been developed for determining the optical properties of metal nanoparticles in transparent matrices. A method for processing experimental data of light scattering spectroscopy and determining the efficiencies of light absorption and scattering is proposed based on a solution to the inverse problem of the theory of radiative transport in a scattering layer with the use of an analytical solution to the radiative transport equation by the spherical harmonics method. The proposed method has been tested on pentaerythritol tetranitrate−aluminum composites. The influence of parameter variation is analyzed, and a conclusion is drawn that the efficiencies of light absorption and scattering by nanoparticles can be correctly determined.

A General Route to Optically Transparent Highly Filled Polymer Nanocomposites

Polymer nanocomposites for optical applications require high optical transparency at high filling ratios of nanoparticles. The nanoparticles provide optical functionality but unfortunately have a strong tendency to aggregate in polymer matrices leading to strong turbidity and reduced optical transmission, particularly at high filling ratios. We report a general route to nonaggregated highly filled, optically transparent polymer nanocomposites. It is based on using nanoparticles that have been coated with polymers forming spherical brushlike layers providing thermodynamic miscibility with the polymer matrix over the complete range of nanoparticle volume fractions. The polymers are attached via a versatile ligand exchange procedure which enables to prepare a wide range of optically transparent polymer nanocomposites up to weight fractions of 45%. This is demonstrated for a broad range of metal and semiconductor nanoparticles in optically transparent polymer matrices relevant for selective light/UV absorptio...

Development of human corneal epithelium on organized fibrillated transparent collagen matrices synthesized at high concentration

Several diseases can lead to opacification of cornea requiring transplantation of donor tissue to restore vision. In this context, transparent collagen I fibrillated matrices have been synthesized at 15, 30, 60 and 90mg/mL. The matrices were evaluated for fibril organizations, transparency, mechanical properties and ability to support corneal epithelial cell culture. The best results were obtained with 90mg/mL scaffolds. At this concentration, the fibril organization presented some similarities to that found in corneal stroma. Matrices had a mean Young’s modulus of 570kPa and acellular scaffolds had a transparency of 87% in the 380–780nm wavelength range. Human corneal epithelial cells successfully colonized the surface of the scaffolds and generated an epithelium with characteristics of corneal epithelial cells (i.e. expression of cytokeratin 3 and presence of desmosomes) and maintenance of stemness during culture (i.e. expression of ΔNp63α and formation of holoclones in colony formation assay). Presence of cultured epithelium on the matrices was associated with increased transparency (89%).

Highly flexible transparent self-healing composite based on electrospun core-shell nanofibers produced by coaxial electrospinning for anti-corrosion and electrical insulation.

Coaxial electrospinning was used to fabricate two types of core-shell fibers: the first type with liquid resin monomer in the core and polyacrylonitrile in the shell, and the second type with liquid curing agent in the core and polyacrylonitrile in the shell. These two types of core-shell fibers were mutually entangled and embedded into two flexible transparent matrices thus forming transparent flexible self-healing composite materials. Such materials could be formed before only using emulsion electrospinning, rather than coaxial electrospinning. The self-healing properties of such materials are associated with release of healing agents (resin monomer and cure) from nanofiber cores in damaged locations with the subsequent polymerization reaction filing the micro-crack with polydimethylsiloxane. Transparency of these materials is measured and the anti-corrosive protection provided by them is demonstrated in electrochemical experiments.

Human limbal epithelial cells cultured on dense fibrillated collagen I transparent matrices

AbstractTransparent (78 to 84% at 580nm) collagen I fibrillated matrices have been synthesized at different concentrations making use of liquid crystal properties of collagen. The 90 mg/mL scaffold presents an organization that resembles the ones found in corneal stroma. Although matrices present low mechanical properties (with Young’s modulus of 2kPa at most) they allow development of an epithelium presenting the main characteristics of the corneal epithelial cells (expression of cytokertin 3 and presence of desmosomes) and maintenance of stemness during culture (i.e. expression of Delta N p63α and formation of holoclones in colony formation assay). Matrices with cultured cells feature higher transparency compared with matrices with no cells.

Designing of all optical generalized circuit for two-input binary and multi-valued logical operations

This paper presents a generalized all optical circuit of two-input logical operation (both binary and multi-valued), using an optical nonlinear material (OPNLM) based switch. The inputs of the logic gates are represented by different polarization states of light. This model is simple, practical and very much useful for future all optical information processing. Proposed scheme can work for different wavelengths and for different materials. The simulation result with the nonlinear material gold nanoparticle embedded in optically transparent matrices alumina (Al2O3) is also presented in the paper.

229Thorium-doped calcium fluoride for nuclear laser spectroscopy

The 229thorium isotope presents an extremely low-energy isomer state of the nucleus which is expected around 7.8 eV, in the vacuum ultraviolet (VUV) regime. This unique system may bridge between atomic and nuclear physics, enabling coherent manipulation and precision spectroscopy of nuclear quantum states using laser light. It has been proposed to implant 229thorium into VUV transparent crystal matrices to facilitate laser spectroscopy and possibly realize a solid-state nuclear clock. In this work, we validate the feasibility of this approach by computer modelling of thorium doping into calcium fluoride single crystals. Using atomistic modelling and full electronic structure calculations, we find a persistent large band gap and no additional electronic levels emerging in the middle of the gap due to the presence of the dopant, which should allow direct optical interrogation of the nuclear transition. Based on the electronic structure, we estimate the thorium nuclear quantum levels within the solid-state environment. Precision laser spectroscopy of these levels will allow the study of a broad range of crystal field effects, transferring Mössbauer spectroscopy into the optical regime.

Optics and Spectroscopy of Exciton States in Quasi - Zero - Dimensional Nanostruсtures: Theory

The review analyzes the results of theoretical investigations of excitons states (electron - hole pairs states) in a quasi - zero - dimensional nanosystems consisting of spherical semiconductor nanocrystals (quantum dots) placed in transparent dielectric matrices. The theory of exciton states in a quantum dot under conditions of dominating polarization interaction of an electron and a hole with a spherical (quantum dot – dielectric matrix) interface are developed. An shown, that the energy spectrum of heavy hole in the valence band quantum dot is equivalent to the spectrum of hole carrying out oscillator vibrations in the adiabatic electron potential. We show that the absorption and emission edge of quantum dots is formed by two transitions of comparable intensity from different hole size – quantization levels and into a lower electron size – quantization level. Propose a theoretical prospect of using hole transitions between equidistant series of quantum levels observed in nanocrystals for desining a nanolaser. The theory of an exciton formed from spatially separated electron and hole (the hole is in the quantum dot volume, and the electron is localized at the outer spherical quantum dot–dielectric matrix interface) is developed within the modified effective mass method. The effect of significantly increasing the exciton binding energy in quantum dots of zinc selenide, synthesized in a borosilicate glass matrix, relative to that in a zinc selenide single crystal is revealed. We developed the theory of a biexcitons formed from spatially separated electrons and holes (the hole is in quantum dot volume, and the electron is localized at the outer surface of the quantum dot – dielectric matrix interface) in a nanosystem that consists of zinc selenide quantum dots synthesized in a glassy matrix.

X-ray Diffraction of AuCl Semiconductor Nanocrystals Embedded in NaCl Single Crystals Grown by Czochralski Method

The synthesis and characterization of small particles of materials is currently an area of intense theoretical and experimental research. The revelation is that physical properties of such systems are bound to be appreciably di erent from those of the bulk crystal. In general, the physical properties of crystals become very di erent when their size becomes very small. Semiconductor nanocrystals embedded in wide gap matrices, such as alkali halides, have drawn considerable interest in recent years because of their special electronic and optical properties as compared to those of the bulk materials [1]. It was found that semiconductor nanocrystals dispersed in transparent matrices represented three-dimensionally con ned quantum wells of electronic excitations. During the past decade, a considerable e ort has been spent in the preparation and investigation of the I VII family of semiconductor nanocrystals. Various methods of the production of I VII nanocrystals embedded in wide gap matrices have been reported [2 4]. Among all the I VII compounds, gold monochloride or AuCl is one of the interesting materials because it is characterized by the interesting optical absorption and emission in the visible region [5, 6]. In the present study, we report the growth of AuCl nanocrystals dispersed in NaCl matrix and study their structural characterisation using X-ray di raction.

Fabrication and Characterization of Antimony Tin Oxide Nanoparticle Networks Inside Polystyrene

AbstractRecently, there has been much interest in the creation of 3D networks of nanowires. One possible way to do this is to encase the nanowires inside transparent polymer matrices since there is also a demand for obtaining conducting transparent composites. If the filler of the composite is made from a strongly conducting material, the degree of connectivity of the networked nanowires can be tested by measuring its conductivity. Though much work has been done with ITO (Tin-doped indium oxide), little has been done with the chemically similar, but cheaper, ATO (Antimony-doped tin oxide). In this study, ATO nanoparticles were added into a polystyrene matrix and simultaneously pressed and heated so that a 3D network of the nanoparticles would form. The effecti veness of the conducting pseudo-nanowire networks was measured as the concentration of ATO in polystyrene was varied. Another variable utilized was the temperature at which the samples were pressed. The optical transmittance of the composites was also measured in order to quantify their transparency. It was found that, once the nanowire networks had percolated at a concentration of about 1.25 PHR, the conductivity and, consequently, the coherence of the networks increased at a decreasing rate as the concentration was increased. The effect of the pressing temperature was complex and required many additional sets of specimens to understand. Samples pressed at the highest temperature had the least coherent networks, as the polystyrene became too fluid and disrupted the ATO networks while at lower temperatures the opposite occurred. The optical transmittance dropped sharply as the concentration of ATO reached and surpassed 1.0 PHR. Nanowire networks were, indeed, formed through this process using these materials, but use as a conducting transparent composite in the visible range is unlikely as the percolation threshold occurs at a concentration greater than that of the optical transmittance drop, creating a trade-off between conductivity and transparency. The resistivity did drop as much as six orders of magnitude and may be useful for other applications.

Effect of the structure of a network matrix on the formation of gold nanoparticles during photoreduction of its salts in solutions of acrylic oligomers

The effect of network parameters of three-dimensionally crosslinked polyacrylic optically transparent matrices on the generation of surface plasmon resonance of gold nanoparticles forming during irradiation of Au3+ salt solutions in a liquid acrylic composite is studied. During the UV irradiation of a solution, the photoreduction of gold and the photoinitiated polymerization of acrylates proceed simultaneously to form transparent colorless films in which, after subsequent light and/or heat treatment, an absorption band near 550 nm that corresponds to the plasmon resonance of nanosize metal particles is generated. During the photoreduction of gold salt in matrices of oligo(urethane acrylate) composites with similar structures of the oligomeric block, the parameters of the three-dimensional network—the internodal and interchain distances—affect the rate of generation of gold nanoparticles but not the limiting value of optical density for the plasmon-resonance band of nanoparticles. Polyacrylate matrices may serve as a registering medium for optical data recording.