Liquid Outflow Research Articles

Numerical design of a flow restrictor for tanked liquid nitrogen undergoing reduced-gravity flights

NASA and the United States are designing multiple reduced-gravity cryogenic payloads to study various two-phase flow phenomena that will be ground-tested and subsequently flight-tested onboard parabolic flights. The setup will undergo 25+ parabolas per flight, during which liquid nitrogen will be cyclically or continuously demanded from a supply Dewar. The minimum gravity level during a parabolic maneuver is 0 ± 0.05 g, which can last around 20 seconds, and the maximum expected gravity is 2 g, which lasts for 40-50 seconds. This Computational Fluid Dynamics (CFD) study focuses on the design and optimization of a bi-directional perforated plate and a ring baffle to help ensure single-phase liquid nitrogen outflow during all flight phases, regardless of supply tank liquid level or gravity level. CFD analyses carried out using ANSYS FLUENT indicate that a double perforated plate with an open area percent equal or less than 0.63% can achieve high values of expulsion efficiency. Structural analyses performed using the ANSYS Static Structural solver determined the minimum plate thickness needed to withstand gravitational and hydrodynamic forces experienced during the flight.

Quantifying Contributions of Different Repulsion to Film Drainage Time during the Bubble-Solid Surface Attachment and Implications for the Flotation of Fine Particles.

The flotation recovery of fine particles faces serious challenges due to the lack of kinetic energy required for supporting their radial displacement and attachment with bubbles. Generally, the hydrodynamic resistance and repulsive disjoining pressure successively inhibit the liquid outflow intervening between the bubble and solid surfaces. To quantitatively characterize the influence of the main repulsion on film thinning time, experiments have been designed in three different aqueous systems. Bubble surface mobility closely associated with hydrodynamic resistance was determined by the rising bubble technique, and the DLVO theory was employed to confirm the evolution of electrostatic repulsion. The film drainage process was then measured based on the high-speed microscopic interferometry. Furthermore, the influence of the main repulsion on bubble-solid surface interactions was examined by flotation recovery. Results show that the earlier buildup of hydrodynamic force ran through the whole film thinning process, and under immobile conditions, the central region gradually became dominant in film thinning due to the very limited fluid flow at the thinnest rim position. Therefore, to achieve the identical film thickness (∼100 nm), the large hydrodynamic resistance could prolong the film thinning time by about 1 order of magnitude, compared with that induced by electrostatic repulsion, which accounts for the increased flotation recovery by 10% using mobile bubbles. This study not only enhances the understanding of how typical repulsive forces work in film drainage dynamics but also opens up an avenue for enhancing flotation and avoiding wasting resources by modulating bubble surface mobility and thus micro/nanoscale fluid flow.

Plant Decellularization by Chemical and Physical Methods for Regenerative Medicine: A Review Article.

Fabricating three-dimensional (3D) scaffolds is attractive due to various advantages for tissue engineering, such as cell migration, proliferation, and adhesion. Since cell growth depends on transmitting nutrients and cell residues, naturally vascularized scaffolds are superior for tissue engineering. Vascular passages help the inflow and outflow of liquids, nutrients, and waste disposal from the scaffold and cell growth. Porous scaffolds can be prepared by plant tissue decellularization which allows for the cultivation of various cell lines depending on the intended application. To this end, researchers decellularize plant tissues by specific chemical and physical methods. Researchers use plant parts depending on their needs, for example, decellularizing the leaves, stems, and fruits. Plant tissue scaffolds are advantageous for regenerative medicine, wound healing, and bioprinting. Studies have examined various plants such as vegetables and fruits such as orchid, parsley, spinach, celery, carrot, and apple using various materials and techniques such as sodium dodecyl sulfate, Triton X-100, peracetic acid, deoxyribonuclease, and ribonuclease with varying percentages, as well as mechanical and physical techniques like freeze-thaw cycles. The process of data selection, retrieval, and extraction in this review relied on scholarly journal publications and other relevant papers related to the subject of decellularization, with a specific emphasis on plant-based research. The obtained results indicate that, owing to the cellulosic structure and vascular nature of the decellularized plants and their favorable hydrophilic and biological properties, they have the potential to serve as biological materials and natural scaffolds for the development of 3D-printing inks and scaffolds for tissue engineering.

New in the hydraulics of channels with permeable walls: indicator of the relative value of the dissipation

The factors that have led to the creation of the scientific direction “hydraulics of variable mass” to study the fluid movement laws in channels with permeable walls are indicated. The results of applying of the dynamics of a variable mass point for describing the flow in such pipelines are presented. It is noted unjustifiability of the second Newton’s law generalization to the case of motion of a variable mass point for hydrodynamics problems. The functionality of one-dimensional and multidimensional models of fluid motion in permeable channels based on the classical equations of fluid and gas mechanics is characterized. It is substantiated the dominance of one-dimensional models in engineering computational practice, and a number of contradictions in the description of fluid dynamics are shown (with the flow visualization). On the base of the new kinematic image (instead of the generally accepted “solid jet”, when fluid particles are separated or joined), it has been obtained a one-dimensional equation of fluid motion in a permeable channel in which the friction coefficient is an indicator of the relative magnitude of the energy dissipation of the flow. The dependence of the Coriolis coefficient on the flow regime is constructed. The structure of the friction drag coefficient of a permeable channel has been studied using the vector dimension of length. It is shown that the dissipation of the flow energy in a permeable channel is higher both during outflow and inflow of liquid than in channels with solid walls at the same flow rates. The results are in demand in the development of chemical technology devices, nuclear reactors with microfuel elements, filters and heat exchangers containing channels with permeable walls.

Нарративы, связанные с мироточением икон, в Российской империи в XVIII–XIX вв. (по материалам РГИА)

Based on the data of the Russian State Historical Archive, an attempt is made to identify stable narratives about myrrh-streaming in the folk tradition of the population of the Russian Empire in the 18th–19th centuries, as well as to trace the influence of these narratives on the formation of the concept of a miracle in the everyday religious consciousness of the region under consideration. Initially, tear-stained icons could manifest themselves by glowing or lightning-like brilliance, fragrant fragrance, mysterious voice, the appearance of new inscriptions on them, some of them designated themselves in a dream or were involved in poltergeist-like events. In the 19th century, the range of motives expanded: now an increasing number of icons can flow myrrh in one house, new ritual practices arise around such “centers of attraction”, and these narratives themselves are increasingly beginning to penetrate into various ethno-confessional environments. The myrrh or other liquid that appeared on the icon was perceived as a manifestation of hierophany and was self-sufficient for believers to believe in a miracle. The very outflow of liquid from the icon not only visually confirmed the possibilities of the image to create a miracle, but also through these signs allowed the believer to be personally involved in this sacred action.

Experimental test-bed for studying submerged fluid outflow from pressure distributive pipe-line laid in an unpressured fluid flow

To develop an experimental stand for the study of the flooded outflow of liquid from pressure distribution pipelines laid in non-pressure flow, a review of ways to reduce the uneven distribution of liquid from pressure distribution pipelines was carried out. Among them, constructively changing the geometric parameters of the distribution pipelines or exhaust devices, giving the axis of the distribution pipeline an inclination to the horizon or the axis of the exhaust devices tilting relative to the axis of the distribution pipeline, changing the angle of the liquid entering the exhaust devices. In the manufactured experimental stand, there must be support in the hydraulic tray to ensure the flooded outflow of liquid from the outlet devices of the distribution pipeline. The presence of liquid support in the hydraulic tray should ensure a flooded outflow of liquid from the outlet devices of the distribution pipeline, and the absence of support - non-flooded outflow. The walls of the hydraulic tray and the distribution pipeline for studying the kinematic characteristics of the external and internal fluid flows, respectively, in the hydraulic tray and the distribution pipeline, and the liquid jete disconnected from the distribution pipeline must be transparent. The slope of the distribution pipeline can be changed relative to the bottom of the hydraulic tray. This achieves different branching angles of the jets to the free surface of the liquid in the hydraulic tray. Due to the design features of the hydraulic tray, the distribution pipeline should be sequential in structure, and not bifurcated. The method of carrying out a study of the flooded outflow of liquid from a pressure distribution pipeline laid in a non-pressure flow has been clarified. Preliminary results confirm the possibility of regulating the uneven distribution of liquid from the pressure distribution pipeline.

A study of the fixed choke and constant outflow method for riser gas handling

Riser gas events appear during offshore drilling operations when there is a presence of gas in a marine riser above the subsea BOP, which has been recognized as a hazardous situation. The selection of pressure control methods during such events significantly impacts the safety and efficiency of riser gas handling (RGH). This paper performed a numerical simulation study on the fixed choke and constant outflow method as one of the most discussed and positively perceived pressure control methods for RGH currently in the industry. The processes of RGH with the proposed fixed choke and constant outflow method were simulated with a comprehensive riser gas influx simulator. The multiphase flow dynamics in a riser were simulated by a drift-flux model with the inclusion of various sub-models and coupled with a multiphase choke flow model. Measurement data (including distributed fiber optic sensing data) from a set of full-scale experiments conducted at the Petroleum Engineering Research, Training, & Testing (PERTT) Laboratory at Louisiana State University (LSU) was used for the calibration and validation of the developed simulator. The performance of the proposed method is evaluated based on the maximum gas and liquid outflow rates and the peak choke upstream pressure during RGH. A series of sensitivity analyses and a contingency case study was conducted to evaluate the applicability and the extendibility of the fixed choke and constant outflow method. The proposed pressure control method shows great potential in enhancing the safety of RGH for a wide range of riser lengths and gas influx sizes with the available managed pressure drilling (MPD) and riser gas handling equipment. The sensitivity analyses revealed that the selection of the initial circulation rates and choke positions has a significant impact on the safety and time efficiency of the RGH operations and should be carefully determined based on the influx and riser system status. This study deepens the understanding of gas influx movement and pressure behaviors in a marine riser during riser gas events. The numerical simulations in this study help to improve the design of riser gas handling strategies.

Automatic Casting Control Method of Continuous Casting Based on Improved Soft Actor–Critic Algorithm

Continuous casting production is an important stage in smelting high-quality steel, and automatic casting control based on artificial intelligence is a key technology to improve the continuous casting process and the product quality. By controlling the opening degree of the stopper rod reasonably, the mold can be filled with liquid steel stably in the specified time window, and automatic casting can be realized. In this paper, an automatic casting control method of continuous casting based on an improved Soft Actor–Critic (SAC) algorithm is proposed. Firstly, a relational model of the stopper rod opening degree and the liquid steel outflow velocity is established according to historical casting data. Then the Markov Decision Process (MDP) model of the automatic casting problem and the reinforcement learning framework based on the SAC algorithm are established. Finally, a Heterogeneous Experience Pool (HEP) is introduced to improve the SAC algorithm. According to the simulation results, the proposed algorithm can predict the stopper rod opening degree sequence under the constraint of the target liquid level curve. Under different billet specifications and interference conditions, an accuracy of 80% of liquid level in the mold and a stopper rod opening degree stability rate of 75% can be achieved, which is 4.29% and 3.17% higher than those for the baseline algorithms, respectively.

Modern possibilities of laser surgery in the treatment of primary open-angle pigmentary glaucoma

PURPOSE. To analyze the effectiveness of the complex method of pigmentary glaucoma laser surgery: YAG-laser iridectomy and multistep selective laser trabeculoplasty (SLT).METHODS. We examined 18 patients (36 eyes) between 13 and 54 years old with primary open-angle pigmentary glaucoma: initial stage was detected in 13 patients (26 eyes), moderate stage — in 4 patients (8 eyes), advanced stage — in 1 patient (2 eyes). Laser iridectomy was performed as the first stage after individual IOP level was reached by drug therapy. SLT was performed 4 weeks later and was repeated around the trabecula every 4–6 months if exogenous pigmentation exceeded grade II. The observation period lasted 4 to 15 years.RESULTS. The glaucoma process was stabilized successfully in all cases. True IOP decreased by 6.6±0.3 mm Hg (-30%, p<0.05), Becker’s coefficient — by 121±4.3 (-60%, p<0.001), the number of drug instillations — by 1.32±0.06 (-70%, p<0.001). The following indicators increased: mean total retinal photosensitivity — by 381±4.3 dB (15%, p<0.001), mean threshold of retinal photosensitivity — by 2.6±0.1 dB (10%, p<0.001), ease of intraocular liquid outflow — by 0.08±0.013 (72%, p<0.001). Hypotensive drug therapy was canceled in 15 cases (41.7%).CONCLUSION. Laser surgery of pigmentary glaucoma consisting of YAG-laser iridectomy combined with multistep SLT is an effective and safe method. It can be performed if the elevated IOP is normalized to the individual norm by drug therapy.

A Novel Data Assimilation-Based Real-Time State Estimation Method for Gas Influx Profiling During Riser Gas Events

AbstractRiser gas events during offshore drilling operations are hazardous and challenging to control. Therefore, knowledge of the gas influx sizes and distributions in a marine drilling riser is critical for the selection of riser gas handling methods and the estimation of risks of riser gas unloading. An extended Kalman filter-based data assimilation method is developed and evaluated for the real-time estimation of gas influx rates and void fraction distributions in a riser during riser gas handling. Full-scale experiments were conducted in this study for the evaluation of the proposed data assimilation method. An offshore well, which consists of a marine drilling riser and a wellbore below the subsea blowout preventer, was simulated by a 1572-m-deep experimental well. Real-time measurement data, including surface and downhole pressures, pump rates, and liquid outflow rates, were used to estimate the downhole gas influx rates using the Kalman filter. An online calibrated drift-flux model based on data assimilation is used to estimate the distributions of void fractions in the riser over time. The measurement data from a gas flowmeter and the distributed fiber-optic sensing were used to validate the estimation results, and satisfying performance was seen from the presented method. This study proposed a novel data assimilation-based state estimation method by maximizing the use of measurement data of different types from the available managed pressure drilling systems. This method enables the more accurate estimation and prediction of gas behaviors in a riser and helps to facilitate real-time decision-making during riser gas handling.

Quiescence of Escherichia coli Aerosols to Survive Mechanical Stress during High-Velocity Collection.

A low cutpoint wetted wall bioaerosol sampling cyclone (LCP-WWC), with an aerosol sampling flow rate of 300 L/min at 55″ H2O pressure drop and a continuous liquid outflow rate of about 0.2 mL/min, was developed by upgrading an existing system. The laboratory strain Escherichia coli MG1655 was aerosolized using a six-jet Collison Nebulizer and collected at high velocity using the LCP-WWC for 10 min with different collection liquids. Each sample was quantitated during a 15-day archiving period after aerosolization for culturable counts (CFUs) and gene copy numbers (GCNs) using microbial plating and whole-cell quantitative polymerase chain (qPCR) reaction. The samples were analyzed for protein composition and antimicrobial resistance using protein gel electrophoresis and disc diffusion susceptibility testing. Aerosolization and collection were followed by an initial period of quiescence or dormancy. After 2 days of archiving at 4 °C and RT, the bacteria exhibited increased culturability and antibiotic resistance (ABR), especially to cell wall inhibitors (ampicillin and cephalothin). The number of resistant bacteria on Day 2 increased nearly four-times compared to the number of cells at the initial time of collection. The mechanical stress of aerosolization and high-velocity sampling likely stunned the cells triggering a response of dormancy, though with continued synthesis of vital proteins for survival. This study shows that an increase in intensity in environmental conditions surrounding airborne bacteria affects their ability to grow and their potential to develop antimicrobial resistance.

Beads for Cell Immobilization: Comparison of Alternative Additive Manufacturing Techniques.

The attachment or entrapment of microbial cells and enzymes are promising solutions for various industrial applications. When the traps are beads, they are dispersed in a fluidized bed in a vessel where a pump guarantees fresh liquid inflow and waste outflow without washing out the cells. Scientific papers report numerous types of cell entrapment, but most of their applications remain at the laboratory level. In the present research, rigid polymer beads were manufactured by two different additive manufacturing (AM) techniques in order to verify the economy, reusability, and stability of the traps, with a view toward a straightforward industrial application. The proposed solutions allowed for overcoming some of the drawbacks of traditional manufacturing solutions, such as the limited mechanical stability of gel traps, and they guaranteed the possibility of producing parts of constant quality with purposely designed exchange surfaces, which are unfeasible when using conventional processes. AM proved to be a viable manufacturing solution for beads with complex shapes of two different size ranges. A deep insight into the production and characteristics of beads manufactured by AM is provided. The paper provides biotechnologists with a manufacturing perspective, and the results can be directly applied to transit from the laboratory to the industrial scale.

Устройство для создания защитного водоплёночного экрана от теплового излучения пожара

Introduction. A device for creating a water-film protective screen designed to protect the fireman in case of fire by significantly reducing the density of the radiant heat flux was studied by the author in this work. The proposed device, unlike analogues, does not have additional metal structures, for example, shields, while being able to create a stable liquid shield necessary to protect the fireman from the thermal radiation of a fire. By mathematical transformations, dependences are obtained for determining the thickness of the water film screen and the required value of the internal overpressure of the liquid in the device. In the course of mathematical transformations, an expression is obtained for determining the fluid pressure required for the expiration of a stable liquid film of a given thickness. Purposes and tasks. To learn how the device works. To create an experimental device to study the process of a water-film screen forming. To develop a methodology of experiments. To carry out an experiment to determine the device operating modes, depending on the fluid flow parameters. To determine experimentally the maximum value of the diameter of a continuous and stable water-film screen. To get a mathematical relationship to determine the thickness of the water-film protective screen and the value of the required overpressure of the liquid inside the device to obtain a continuous and stable screen. Methods. Natural experiment. Observation. Measurement. Description. Finding dependencies based on mathematical processing of experimental data. Results and discussion. A natural experiment was conducted. The results of research on the creation of a water-film protective screen have been obtained. The most optimal parameters of the device operation have been determined. It is established that the value of the diameter of the water film screen is 10 times greater than the value of the diameter of the channel of the device for the outflow of liquid. The use of known means of protection against the effects of radiant heat exposure contributes to a significant reduction in the distance from the point of use of fire extinguishing means to the point of fire occurrence. However, the devices used are made of heat-conducting materials, which makes it difficult to operate them as a means of protection against radiation from a thermal source of ignition at a small distance between them. In addition, the presence of metal structures reduces the possibility of using these devices when using additional fire extinguishing means. The basis for the regular operation of the proposed device for the formation and issuance of a protective liquid screen for fireman is to create a film curtain of liquid, the thickness and diameter of which is determined and regulated by the hydrodynamic operating mode and design characteristics. Conclusions. The proposed device works without additional metal structures (shields and nets), which makes it possible to use it at facilities with difficult access to an ignition source. Keywords: fire; thermal radiation; water curtain; water film; protective screen.

Zwitterionic surfactant–stabilized ionogel electrolytes with high ionic conductivity for lithium secondary batteries

Considering the safety risks posed by the liquid organic electrolytes of conventional lithium-ion batteries, considerable attention has been drawn to the development of safer solid-state alternatives such as ionic liquid (IL)-containing ionogels. Although photocurable ionogels can entrap ILs without altering their primary properties and do not suffer from liquid outflow, the lithium salts dissolved in ILs form ion pairs rather than dissociate into free ions, which results in poor ion-transport properties. To address this problem, we herein immobilize a zwitterionic surfactant on the surface of a polymeric matrix to afford stabilized ionogels with the surfactant dipole structure oriented toward the IL-based electrolyte. The enhanced lithium-ion conductivity of these ionogels positively influences lithium plating/stripping behavior and performance in lithium iron phosphate half-cell tests, with the best rate capability (116.8 mAh g−1 at 1 C) and cycling performance (initial discharge capacity = 148.9 mAh g−1, capacity fading rate = 0.069% per cycle) obtained at a surfactant loading of only 2 wt%. Thus, this study paves the way to the design of high-performance zwitterion-containing ionogel electrolytes as less flammable and leakage-prone alternatives to conventional liquid organic electrolytes for lithium secondary batteries.

Stimuli‐Responsive Sponge for Imaging and Measuring Weak Compression Stresses

Imaging and measuring compression stresses secure a safe and healthy life. Compression stresses in kPa range are not easily detected by conventional mechanoresponsive materials because microscopic molecular motion of the chromophores is not induced by such weak stresses. Moreover, imaging of the stress distribution is not achieved so far. The present study shows a sponge device combining two stimuli-responsive materials, a capsule releasing interior liquid and color-changing polymer in responses to compression stress and chemical stimulus, respectively. The stimuli-responsive capsule is dispersed on a melamine sponge comprised of the fibers with coating the layered polydiacetylene (PDA). The application of weak compression stresses induces collapse of the capsules, outflow of the interior liquid, and subsequent irreversible color change of PDA. The cascading response in the sponge device colorimetrically enables imaging of the distribution and measuring the strength of the compression stresses in kPa range. Furthermore, the device demonstrates imaging and measuring unknown weak compression stresses applied by the irregular-shaped objects. A couple of clinical issues in surgical operation of intestine are studied using the stress-imaging sponge device. The device and its design strategy can be applied to stress imaging in a variety of fields.

Studying the Process of Transport Equipment Cooling System Ultrasonic Cleaning

The article deals with the existing methods of cleaning vehicle radiators from sedimentary scale. A method of cleaning radiator tubes by ultrasonic radiation is proposed. An experimental bench has been developed for studying ultrasonic cleaning processes. Based on the results of the experiment, dependences have been obtained that determine the efficiency of the process depending on the mass of scale removed and the liquid outflow rate from the tubes. There are proposed the purification degree coefficients. The hypothesis about the possibility of cleaning radiators with ultrasonic vibrations has been confirmed.

Diagnosis and treatment of left ureteral injury as a rare complication of oblique lumbar interbody fusion surgery: a case report and literature review

BackgroundOblique lumbar interbody fusion (OLIF) surgery has been performed as a minimally invasive lateral lumbar fusion technique in recent years. Reports of operative complications of OLIF are limited, and there are fewer reports of ureteral injuries.Case presentationA 62-year-old Chinese woman diagnosed with "lumbar spondylolisthesis (L4 forward slip, I degree)" underwent OLIF treatment. The surgical decompression process was smooth, and the cage was successfully placed. After the expansion sleeve of OLIF was removed, clear liquid continuous outflow from the peritoneum was found. The patient was diagnosed with a ureteral injury. The urological surgeon expanded the original incision, and left ureteral injury anastomosis and ureteral stent implantation were performed. The patient was changed to the prone position and a percutaneous pedicle screw was placed in the corresponding vertebral body. The patient was indwelled with a catheter for 2 weeks, and regular oral administration of levofloxacin to prevent urinary tract infection. After 2 months, the double J tube was removed using a cystoscope. One year after surgery, the symptoms of lumbar back were significantly improved, and there were no urinary system symptoms. However, the patient needed an annual left ureter and kidney B-ultrasound.ConclusionUreteral injury is a rare complication and is easily missed in OLIF surgery. If the diagnosis is missed, the consequences can be serious. Patients should undergo catheterization before the operation and hematuria should be observed during the operation. We emphasize the careful use of surgical instruments to prevent intraoperative complications. In addition, after withdrawing the leaf in the operation, it is necessary to carefully observe whether a clear liquid continues to leak. If ureteral injury is found, one-stage ureteral injury repair operation should be performed to prevent ureteral stricture.

Outflow of a Boiling Liquid from a Tubular Channel under the Action of a Hydraulic Friction Force

Outflow of a Boiling Liquid from a Tubular Channel under the Action of a Hydraulic Friction Force

Electrically Suppressed Outflow of Confined Liquid in Hydrophobic Nanopores.

Confining liquid in a hydrophobic nanoenvironment has enabled a broad spectrum of applications in biomedical sensors, mechanical actuators, and energy storage and converters, where the outflow of confined liquid is spontaneous and fast due to the intrinsic hydrophobic nature of nanopores with extremely low interfacial friction, challenging design capacity and control tolerance of structures and devices. Here, we present a facile approach of suppressing the outflow of water confined in hydrophobic nanopores with an electric field. Extensive molecular dynamics simulations show that the presence of an electric field could significantly strengthen hydrogen bonds and retard degradations of the associated networks during the outflow. The outflow deformation and strength are extracted to quantitatively characterize the electrical suppression to outflow and agree well with simulations. This study proposes a practical means of impeding the fast liquid outflow in hydrophobic nanopores, potentially useful for devising nanofluidics-based functional structures and devices with controllable performance.

Grafted mesoporous silicas for radionuclide uptake: Radiolytic stability under electron irradiation

Materials developed for radionuclide adsorption need to resist harsh conditions, i.e. be robust against ionizing radiation. In this work, we evaluated the degradation of mesoporous silicas (SBA-15) grafted with hydroxypiridinone, acetamide phosphonate and propionamide phosphonate ligands under electron irradiation. The ligands contained amide and/or phosphinic acid functional groups, which made them able to bind to actinides. Degradation of the grafted ligand was assessed by identifying and quantifying the gas produced under irradiation using gas chromatography, as well as characterizing the grafted ligands before and after irradiation by means of FT-IR, XPS and TGA techniques. Irradiation led to the degradation of amide functional groups and to the production of amine and carboxylic acid groups. Corresponding reaction mechanisms were proposed. The sorption behavior of the grafted SBA-15 materials for thorium was also studied. SBA-15 materials grafted with acetamide phosphonate and propionamide phosphonate ligands were shown to be able to adsorb thorium. The propionamide phosphate ligand was the most efficient, with an equilibrium sorption capacity of 95 mg g−1. This capacity remained stable up to a 1 MGy irradiation dose and underwent a 20% decrease after 4 MGy of irradiation. Therefore, this material is potentially interesting for the treatment of liquid outflows contaminated by actinides produced in nuclear facilities.