Silicone Oil Research Articles

A rationally designed polymer brush/lubricant coating system for effective static and dynamic marine antifouling

Bioinspired slippery surfaces have garnered significant attention as promising solutions to mitigate biofouling. Unlike traditional lubricant-infused porous surfaces, recent research has focused on the integration of lubricants within polymer brush-grafted surfaces. The combination of polydimethylsiloxane (PDMS) polymer brush and silicone oil has gradually become the most prevalent choice due to their outstanding chemical affinity. However, this conventional coating system also has the potential for improvement to meet the needs of long-lasting and efficient marine antifouling, including i) precisely designing the polymer brush’s chemical structure to match the polarity of a specific lubricant enhances their chemical affinity, and ii) appropriately reduce the coating system’s surface energy to improve the fouling desorption performance. Here, we introduce a systematically engineered polymer brush/lubricant coating system that incorporates fluorinated polysiloxane and perfluoropolyether fluid. This novel coating system exhibits enhanced adhesion strength coupled with reduced surface energy, resulting in superior stability and omniphobic properties. Additionally, it showcases excellent corrosion resistance and significantly deters marine microorganism adhesion, achieving reductions of 98.8 % for P. tricornutum and 99.8 % for Bacillus sp.. Marine field trials, conducted over a 90-day static immersion period, confirm the remarkable antifouling performance, which surpasses most existing slippery coatings. Moreover, under dynamic conditions, organisms adhering for 150 days are readily dislodged by shear force. These findings underscore the pivotal role of systematic design in polymer brush/lubricant coating systems for the advancement of high-performance slippery surfaces tailored for marine antifouling applications.

Research on mechanics and acoustic properties of Jute fiber composite material

In this study, the loss of quality from the oxidative thermal decomposition of jute fiber was explored during the production of reinforced composite materials. Amino silicone oil was used to modify jute fiber, which was then subjected to thermogravimetric analysis. The modified fiber's thermal decomposition temperature was found to be 271 °C, enhancing the composite's thermal stability. The study also investigated how different jute fiber content affected the mechanical and sound absorption properties of composite materials. Results showed that jute fiber composites had better mechanical properties than pure polypropylene materials, and the average sound absorption coefficient of jute polypropylene composites increased with fiber content. Adding jute fiber to polypropylene effectively improved the sound absorption and noise reduction performance of the material. The average sound absorption coefficient of the composite material at a mass content of 20 wt% was 120 % higher than that of the polypropylene matrix material.

An anti-extreme-environment self-healing vanillin-based icephobic coating with UV-shielding performance and recyclability

Outdoor icephobic coatings are prone to damage, particularly in extreme weather conditions like freezing temperatures and acid rain. Damage to the coating will result in a loss of icephobic function and may lead to increased icing. Furthermore, it is imperative to incorporate sustainability into icephobic coatings as environmental consciousness grows. Herein, a vanillin-based icephobic coating with anti-extreme-environment self-healing was prepared by incorporating vanillin-based polyols into prepolymers terminated with isocyanates that include silicone oil. The coating exhibited low ice adhesion with a measurement of 8.8 kPa, which was mainly attributed to the hydrophobicity of PDMS and the hydrophobic and lubricating characteristics of silicone oil. Moreover, the coating's remarkable chemical stability and ability to resist fouling were due to its lubricating and hydrophobic properties. More importantly, the coating retains impressive self-healing abilities in extreme conditions (−20 °C, pH = 1, pH = 14) due to the multiple dynamic bonds within the coating and the water-repelling and plasticizing effects of silicone oil. The coating maintained its original hydrophobic characteristics and low ice adhesion strength even after several recycling and self-healing cycles, demonstrating remarkable lifespan and sustainability. This work facilitates meeting the need for anti-icing in outdoor areas, particularly in extremely cold, acidic, and alkaline conditions.

Clinical trial to test the safety of the EVA Nexus surgical platform

BackgroundThe EVA Nexus system offers several technical improvements over its predecessor. The newly designed Aveta cannula system for vitrectomy surgery avoids the need for removal of the valve from the infusion cannula. The chamfered leading edge of the cannula also reduces the insertion force needed. The new EquiPhaco needles in combination with SmartIOP provide excellent anterior chamber stability during phaco-emulsification surgery, enabling to work at lower infusion pressures, and the multiburst phaco mode allows easier removal of hard cataracts. The system offers a secondary active infusion line for independent control of pressure to the anterior and posterior chambers, monitoring of flow rate/reflux and warning of infusion bottle emptying. This study evaluated whether these technical improvements result in improved surgical safety.MethodsIn total, 250 eyes that underwent vitrectomy (53%) or phaco-vitrectomy (47%) using the EVA Nexus system were prospectively included. The occurrence of intraoperative adverse events was compared to that of historically operated eyes using the EVA system.ResultsThe average age of the patients was 63 years. A total of 33% of the patients were operated on for retinal detachment, 17% for macular pucker, 11% for treating floaters, 9% for removing silicone oil, 8% for macular hole repair and 22% for other diseases. In 75% of surgeries, 23 G instruments were used, and 27 G instruments were used in 25% of cases. Device issues that occurred included priming cycle issues (n = 4), eye pressure stability problems (n = 6) and vitrectome performance issues (n = 1), all of which in the first 100 patients who were included and were fixed with software updates. The frequency of surgical complications in the anterior segment was lower than that in the historically recorded surgical reports. Intraoperative events in the posterior segment included hemorrhage from retinal vessels, choroidal hematoma, iatrogenic retinal damage/tear, and subchoroidal infusion. Again, these events occurred rarely and less frequently than in the historical surgical reports.ConclusionsThe EVA Nexus provides a surgical platform that reduces the incidence of intraoperative adverse events and iatrogenic complications in both anterior and posterior segment surgery. This could increase surgical safety during cataract and vitrectomy surgery.Trial Registration number Clinicaltrials.gov: NCT05229094 Data 22/5/2021.

Lightweight, compressible, stretchable, ultra-soft, and mechanically stable composites for piezo-electric energy generators and strain sensing

Fabricating rubber composites with desired densities, compressibilities, stretchabilities, mechanical strengths, and self-healing properties is challenging. The present study focused on designing balanced properties, paying special attention to the mechanical stability required for piezo-electric energy generators for soft applications. To achieve these goals, silicone rubber (SR) was used as the host matrix, and multi-walled carbon nanotubes (MWCNTs) were used as the filler. MWCNTs were used as filler to reinforce composites and make them electrically conductive. Adding silicone oil as a thinner reduced compressive modulus and tensile strength but improved stretchability. The compressive modulus of the SR control was 1.86 MPa, and it increased to 3.29 MPa when 2 phr of MWCNTs were added. However, it was decreased sharply to 1.14 MPa when 30 % thinner was added (the T30 sample). Similarly, the stretchability of the SR control was 143 %, and it increased to 159 % and 200 % when 2 or 10 phr (the T10 sample) of MWCNTs were added, respectively. Biomechanical tests showed that a thumb pressure generated the highest output voltages of 4.2 and 4.31 mV at MWCNT contents of 2 and 10 phr, respectively. Finally, strain sensing tests on the 2 phr MWCNT sample show good sensitivity (0.29 < GF < 0.95), a wide detection range (0 % < Δε < 40 %), and excellent linearity (0.998 < R2 < 0.949). Overall, adding thinner up to 10 phr provided the best formulation for mechanical stability and robust performance with optimum energy generation and high stretchability.

Multifunctional polyurethane-based coating with corrosion resistance and anti-icing performance for AA2024-T3 alloy protection

In this study, we present the development of advanced anticorrosive icephobic coatings tailored for AA2024-T3 surfaces. These coatings were engineered using polyurethane, incorporating fluoropolyol and isocyanate modified with hydroxyl-terminated silicone oil and fluoroalkyl polyhedral oligomeric silsesquioxane (F-POSS) particles. Surface characterization involved contact angle and sliding angle measurements, as well as atomic force microscopy. The icephobic efficacy was evaluated through a battery of tests including differential scanning calorimetry, delay of freezing time measurement, impact and non-impact ice adhesion measurement (push-off and centrifuge), and the ice accretion method. Electrochemical impedance spectroscopy served to evaluate the anticorrosion performance of the coatings. The integration of silicone oil and F-POSS led to notable improvements in contact angles, increasing from 92° to 127°. The lowest sliding angle (6°) was obtained for the coating containing both silicone oil and F-POSS. Topographical images showed the essential role of F-POSS in providing a rough surface structure. The optimal coating formulation consisted of 10 wt% F-POSS particles and 5 wt% silicone oil, resulting in a water contact angle of 127°, a sliding angle of 9°, approximately 42 days of surface protection, and an impedance value of 4.8 × 108 Ω·cm2. Remarkably, this coating demonstrated exceptional durability in terms of icephobic properties, maintaining a push-off ice adhesion strength of 9.3 kPa even after 15 icing/de-icing cycles, confirming its desirable icephobic performance.

Intrinsic Self-Healable, Corrosion-Resistant Silicone Coating Based on Quadruple Hydrogen-Bonded Supramolecular Polymer.

Corrosion-resistant coatings with self-healing capabilities are still a great challenge for metal protection. In this study, a corrosion-resistant coating with intrinsic self-healing capabilities was developed by compounding hydroxy-terminated silicone oil (HTSO) with 2-ureido-4[1H]-pyrimidone (UPy) derivatives. The smooth surface of the coating was shown by scanning electron microscopy (SEM), and good smoothness was also exhibited in the cross-section, which indicated that the coating is very homogeneous from the top to the bottom. Thermogravimetric analysis (TG) was employed to illustrate the temperature-resistant characteristics of the coating, revealing its significant chemical stability up to 360 °C. The corrosion resistance of the coating is assessed through electrochemical impedance spectroscopy (EIS), the typical impedance at 0.01 Hz is 1.70 × 109 and 2.44 × 108 Ω·cm2 before and after exposure to a 3.5 wt % NaCl solution for 70 days. There was no significant change in the water contact angle of the coatings before and after immersion; however, the adhesion strength was reduced. Notably, the coating demonstrates immediate and multiple self-healing properties. The tensile stress of the associated healing sample experiences an augmentation within the temperature range of 30-120 °C, with the critical fracture strain of the healed sample reaching 235% at 120 °C. The self-healing mechanism of the coating is systematically investigated using in situ Raman spectroscopy.

"Honeycomb" Photothermal Lubricated Porous Foam with Low-Temperature, Weak-Light, Anti-Icing/Deicing, and Long-Lasting Lubrication Properties.

The prevalence of icing in nature has become a significant threat to human work and life, prompting the development of more energy-efficient active/passive combination anti-icing/deicing technologies. In order to overcome the disadvantage of the poor durability of superhydrophobic surfaces, lubricated surfaces inspired by nepenthes have been preferred. In this study, a paraffin and silicone oil-infused photothermal foam (PSIPF) with excellent overall performance was prepared using polypyrrole (PPy) as a photothermal conversion material, a mixture of silicone oil and paraffin as a lubricating fluid, and melamine foam (MF) as a carrier. The surface adhesive strength is less than 20 kPa at -20 °C, the melting time is only 1018 s at an irradiance of 200 W/m2 and -20 °C (0.2 sun), and surface droplets do not freeze within 1 h at -10 °C. Furthermore, the surface exhibits excellent mechanical durability and stability, maintaining optimal lubrication properties following repeated cycles of icing/deicing, water rinsing, and immersion for 2 days in acid and alkaline conditions. This photothermal lubricated surface with excellent anti-icing/deicing properties at low temperatures and in weak-light environments provides a wider range of applications for equipment at high latitudes and high altitudes.

Accuracy of using the axial length of the fellow eye for IOL calculation in retinal detachment eyes undergoing silicone oil removal

PurposeEvaluate whether the axial length of the fellow eye can be used to calculate the intraocular lens (IOL) in eyes with retinal detachment.DesignRetrospective, consecutive case series.MethodsOur study was conducted at...

EXPERIMENTAL INVESTIGATION ON ONE-WAY ABRASIVE FLOW MACHINING ON HOT WORK STEEL

Abrasive flow machining (AFM) is a process where a semi-solid abrasive-laden media is forced to flow through the internal passages of a workpiece under pressure. In high-resolution work, increased accuracy and faster smooth surface polishing work with the developed motorized AFM prototype. This research presents the effect of the clearance of specimen tools for surface roughness (Ra) of SKD 61 (AISI H13) hot work steel related to AFM. This research experimented with half-spherical specimens. AFM experiments are performed to identify the improved surface roughness when applied to the polishing specimens. Specimens were prepared by being turned, hardened, and polished with sandpaper from number P180 to P1200 and measured with an original value of Ra compared with the final value of Ra at the end of the process. The experimental prototype uses a unidirectional motor drive system different from previously developed machines. The process parameters are as follows: a pressure (p) of 1, 2, and 3 bar, cycle time (t) of 10, 15, and 20 min., an abrasive particle size (Al2O3) of 5.0 μm in Silicon Oil (50 % concentration by weight), hardness of specimens 45±2 HRC, etc. The experimental results show that under these conditions, the average surface roughness of specimens was decreased from an original value of Ra 0.057 to 0.042 μm. The greatest response surface (RSM) was obtained at a pressure of 3 bar and a time of 20 minutes. The result allows for better precision control and further development in industrial applications.

Molecular Dynamics Simulation of Silicone Oil Polymerization from Combined QM/MM Modeling.

We outline a molecular simulation protocol for elucidating the formation of silicone oil from trimethlyl- and dimethlysilanediole precursor mixtures. While the fundamental condensation reactions are effectively described by quantum mechanical calculations, this is combined with molecular mechanics models in order to assess the extended relaxation processes. Within a small series of different precursor mixtures used as starting points, we demonstrate the evolution of the curing degree and heat formation in the course of polymer chain growth. Despite the increasing complexity of the amorphous agglomerate of polymer chains, our approach shows an appealing performance for tackling both elastic and viscous relaxation. Indeed, the finally obtained polymer systems feature 99% curing and thus offer realistic insights into the growth mechanisms of coexisting/competing polymer strands.

Prognostic Factors for Recurrent Rhegmatogenous Retinal Detachment after Silicone Oil Removal.

To investigate the prognostic factors for recurrent rhegmatogenous retinal detachment following silicone oil removal. This retrospective review included 147 consecutive patients with rhegmatogenous retinal detachment treated with silicone oil tamponade at a high-volume referral-based tertiary hospital between January 2012 and May 2022. All patients underwent follow-up for a minimum of 6 months after subsequent silicone oil removal. The primary outcome measure was the rate of recurrent retinal detachment following silicone oil removal, and the secondary outcome was best-corrected visual acuity after silicone oil removal. The mean silicone oil tamponade duration was 4.7 ± 5.01 months (range, 1-38 months; median, 3 months), and the recurrent retinal detachment rate after silicone oil removal was 15.6%. Logistic regression analysis revealed that argon endolaser photocoagulation during silicone oil removal (odds ratio [OR], 0.309; 95% confidence interval [CI], 0.106-0.898; p = 0.031) was associated with a lower rate of anatomical success after silicone oil removal. Demographics, preoperative ocular characteristics, proliferative vitreoretinopathy, previous scleral encircling or buckling, previous retinectomy, concomitant phacoemulsification, duration of silicone oil tamponade, and gas tamponade after silicone oil removal were not significantly associated with recurrent retinal redetachment after silicone oil removal. Duration of silicone oil tamponade (OR, 1.226; 95% CI, 1.073-1.402; p = 0.003) and recurrent retinal detachment after silicone oil removal (OR, 3.400; 95% CI, 1.311-8.817; p = 0.012) were associated with poor visual outcomes after silicone oil removal. Among all factors examined in this study, including the duration of silicone oil tamponade, laser retinopexy was the only significant prognostic factor for recurrent retinal detachment after silicone oil removal. A longer duration of silicone oil tamponade was associated with worse visual outcomes and a lower rate of visual improvement after silicone oil removal.

SPI-Modified h-BN Nanosheets-Based Thermal Interface Materials for Thermal Management Applications.

The rising concern over the usage of electronic devices and the operating environment requires efficient thermal interface materials (TIMs) to take away the excess heat generated from hotspots. TIMs are crucial in dissipating undesired heat by transferring energy from the source to the heat sink. Silicone oil (SO)-based composites are the most used TIMs due to their strong bonding and oxidation resistance. However, thermal grease performance is unreliable due to aging effects, toxic chemicals, and a higher percentage of fillers. In this work, TIMs are prepared using exfoliated hexagonal boron nitride nanosheets (h-BNNS) as a nanofiller, and they were functionalized by ecofriendly natural biopolymer soy protein isolate (SPI). The exfoliated h-BNNS has an average lateral size of ∼266 nm. The functionalized h-BNNS/SPI are used as fillers in the SO matrix, and composites are prepared using solution mixing. Hydrogen bonding is present between the organic chain/oxygen in silicone polymer, and the functionalized h-BNNS are evident from the FTIR measurements. The thermal conductivity of h-BNNS/SPI/SO was measured using the modified transient plane source (MTPS) method. At room temperature, the maximum thermal conductivity is 1.162 Wm-1K-1 (833% enhancement) at 50 wt % of 3:1 ratio of h-BNNS:SPI, and the thermal resistance (TR) of the composite is 5.249 × 106 K/W which is calculated using the Foygel nonlinear model. The heat management application was demonstrated by applying TIM on a 10 W LED bulb. It was found that during heating, the 50 wt % TIM decreases the surface temperature of LED by ∼6 °C compared with the pure SO-based TIM after 10 min of ON condition. During cooling, the modified TIM reduces the surface temperature by ∼8 °C under OFF conditions within 1 min. The results indicate that natural polymers can effectively stabilize and link layered materials, enhancing the efficiency of TIMs for cooling electronics and LEDs.

Petrographic and chemical characterization and carbon and nitrogen isotopic compositions of cometary IDPs and their GEMS amorphous silicates

GEMS (glass with embedded metal and sulfides) are the dominant carrier of amorphous silicates in anhydrous interplanetary dust particles (IDPs) and one of the most suitable materials to study early solar system processes. Amorphous silicates in 105 GEMS from eight IDPs were analyzed regarding texture and chemical composition to reassess GEMS formation theories and genetic relationships to amorphous silicate material in meteorites. Petrography of bulk IDPs was investigated to understand GEMS’ relationships to other IDP components. Furthermore, carbon and nitrogen isotopic compositions were measured. Nearly all GEMS are aggregates of several subgrains with variable amount of nanophase inclusions and different Mg- and Si-contents, while single GEMS are rare. The subgrains within aggregates are typically surrounded by one or more carbon rims with high density. The chemical compositions of GEMS amorphous silicates are subsolar for all major element/Si ratios but exhibit wide heterogeneity. This is not influenced by silicon oil from the capturing process of IDPs as assumed before, as a penetration of the silicon oil is excluded by high resolution EELS (electron energy loss spectroscopy) areal density maps of silicon. Furthermore, low Fe-content in GEMS amorphous silicates shows that these are not altered by aqueous activity on the parent body as it is the case for amorphous silicate material in primitive meteorites. The subsolar element/Si ratios and the wide chemical heterogeneity point to a non-equilibrium fractional condensation origin either in the early solar nebula or in a circumstellar environment and are not in agreement with homogenization via sputtering in the ISM. The close association with carbon around GEMS subgrains and as double-rims around GEMS aggregates argue for a multi-step aggregation after formation of the smallest GEMS subgrains in the ISM or the early solar nebula. Carbon acting as matrix material connecting GEMS and other IDP components has lower areal density as seen from carbon EELS areal density maps and isotopic anomalies varying at the nanometer scale, pointing to different origins and processing of materials to varying extent or at changing temperatures.To balance GEMS’ subsolar element/Si ratios, a supersolar component in IDPs was assumed to account for the overall chondritic composition of bulk IDPs. Nevertheless, our bulk IDP analyses revealed subsolar, but variable, element/Si ratios for complete particles as well, depending on type and amount of mineral phases in each particle. Pyroxenes in the investigated particles can occur as elongated euhedral crystals, but are overall rare. The dominant crystalline fraction in the investigated IDP samples are equilibrated aggregates (EAs) that show the same chemical compositions as GEMS, indicating that the EAs are recrystallized GEMS grains and formed after GEMS formation as secondary phases.

Division of Bénard-Marangoni cells in bottom heated thin rectangular liquid layers under high supercritical number

Though the time-dependent behavior of Bénard-Marangoni (BM) cells has been widely investigated in the past decades, most are concerned with the transformation of geometrical shape whereas few consider its division. Unlike the original incipience of the classical BM cell which comes from a static liquid layer with uniform surface temperature, the cell division occurs in a layer occupied by BM cells. The behavior of cell division is more complex than its original incipience, which is not yet understood clearly. The reason and critical conditions of the division are also unclear. The present work is aimed at these issues and a series of experiments are performed in bottom heated thin layers of silicone oil in rectangular pools. The results demonstrate that the cell division needs three conditions, i.e., an enough high supercritical number ε (= (Mav − Mac)/Mac), an enough high ratio k of local horizontal Marangoni number to local vertical Marangoni number of the cell, and five or more edges of the cell. Under enough high ε, a new cell is generated at a corner of the original cell where k is the largest among the cell corners. The percent of cell division increases with increases of ε and Pr. With increasing ε, the previous generated pentagonal cell further divides and the original cell eventually divides into three or even four cells. The threshold of the average ratio of the maximum local horizontal Marangoni number to the maximum local vertical Marangoni number for incipience of cell division is determined. The mechanisms of cell divisions are clarified and the flow field during division is provided by experiment and numerical simulation. This work helps for understanding the behavior of BM instability after generation.

Vision loss associated with silicone oil endotamponade in vitreoretinal surgery - a review.

To clarify the definition, prevalence and classification of different types of unexplained vision loss associated with silicone oil (SO) endotamponades (SO in situ (SOIS) or after removal of SO (ROSO)) in vitreoretinal surgery and identifying the most specific clinical findings and suggesting possible causes. Review of the literature regarding randomized clinical trials (RCTs), retrospective case-control, cohort studies and case series evaluating the risk of using SO, published in English between 1994 and 2023, conducting a computer-based search of the following databases: PubMed, Web of Science, Scopus and Embase. The search was supplemented using the Medline option 'Related Articles' and consulting review articles on the topic. Findings from reported clinical examinations in SOIS and ROSO are analyzed and finally different theories regarding the underlying pathophysiology are described. From the clinical point of view, findings have been found in OCT, OCTA, microperimetry and electrophysiological studies. Other clearly identifiable causes of vision loss related to the use of SO are listed and commented as differential diagnosis. Finally, the different physiopathological theories of the two types of causes of unexplained vision have been analyzed. Unexpected vision loss under or after SO tamponade (SOIS and ROSO) is a significant concern which is probably underestimated because it is not a clearly defined and known entity. The most frequently described changes were in the ganglion cell complex but this unexpected vision loss remains a serious and unexplained concern for vitreoretinal surgeons and should be identified by clinicians, addressed by manufacturers and reported to Health Authorities as a serious incident according to the new regulation.

Internal limiting membrane peeling combined with silicone oil or air tamponade for highly myopic foveoschisis.

To compare the efficacy of pars plana vitrectomy (PPV) combined with internal limiting membrane (ILM) and silicone oil or sterile air tamponade for the treatment of myopic foveoschisis (MF) in highly myopic eyes. This retrospective study included 48 myopic eyes of 40 patients with MF and axial lengths (ALs) ranging from 26-32 mm treated between January 2020 and January 2022. All patients were underwent PPV combined with ILM peeling followed by sterile air or silicone oil tamponade and followed up at least 12mo. Based on the features on spectral-domain optical coherence tomography (SD-OCT), the eyes were divided into the MF-only group (Group A, n=15 eyes), MF with central foveal detachment group (Group B, n=20 eyes), and MF with lamellar macular hole group (Group C, n=13 eyes). According to AL, eyes were further divided into three groups: Group D (26.01-28.00 mm, n=12 eyes), Group E (28.01-30.00 mm, n=26 eyes), and Group F (30.01-32.00 mm, n=10 eyes). The best-corrected visual acuity (BCVA), central foveal thickness (CFT), and complications were recorded. The patients included 16 males and 24 females with the mean age of 56±9.82y. The BCVA and CFT improved in all groups after surgery (P<0.01), while there was no significant difference of the CFT in Group A, B, and C postoperatively (P>0.05). The intergroup differences of BCVA and CFT postoperatively were statistically significant in Group D, E, and F. Twenty eyes were injected with sterile air, and 28 eyes were injected with silicone oil for tamponade based on the AL. However, there was no statistically significant difference among Groups D, E, and F in terms of the results of sterile air or silicone oil tamponade. The mean recovery time was 5.9mo for MF patients subjected to silicone oil tamponade and 7.7mo for patients subjected to sterile air tamponade, and the difference was not statistically significant. PPV and ILM peeling combined with silicone oil or sterile air tamponade can achieve good results for MF in highly myopic eyes with ALs≤32 mm.

NIR-Driven Self-Healing Phase-Change Solid Slippery Surface with Stability and Promising Antifouling and Anticorrosion Properties.

Slippery liquid-infused porous surfaces (SLIPSs) have great potential to replace traditional antifouling coatings due to their efficient, green, and broad-spectrum antifouling performance. However, the lubricant dissipation problem of SLIPS severely restricts its further development and application, and the robust SLIPS continues to be extremely challenging. Here, a composite phase-change lubricant layer consisting of paraffin, silicone oil, and MXene is designed to readily construct a stable and NIR-responsive self-healing phase-change solid slippery surface (PCSSS). Collective results showed that PCSSS could rapidly achieve phase-change transformation and complete self-healing under NIR irradiation and keep stable after high-speed water flushing, centrifugation, and ultrasonic treatment. The antifouling performance of PCSSS evaluated by protein, bacteria, and algae antiadhesion tests demonstrated the adhesion inhibition rate was as high as 99.99%. Moreover, the EIS and potentiodynamic polarization experiments indicated that PCSSS had stable and exceptional corrosion resistance (|Z|0.01Hz = 3.87 × 108 Ω·cm2) and could effectively inhibit microbiologically influenced corrosion. The 90 day actual marine test reveals that PCSSS has remarkable antifouling performance. Therefore, PCSSS presents a novel, facile, and effective strategy to construct a slippery surface with the prospect of facilitating its application in marine antifouling and corrosion protection.

Emulsified silicone oil in anterior chamber

Emulsified silicone oil in anterior chamber

Двухэтапное хирургическое лечение регматогенной отслойки сетчатки, осложненной выраженной пролиферативной витреоретинопатией, с применением первичной круговой ретинотомии и отсроченной эндолазеркоагуляцией сетчатки в уменьшенном объеме

Abstrakt Primary retinotomy in the surgical treatment of complicated rhegmatogenous retinal detachment with severe proliferative vitreoretinopathy D.O. Shkvorchenko, B.E. Malyugin, A.Yu. Kornienko, E.S. Khrisanfova, O.B. Klepinina S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russian Federation Purpose. To develop a method of surgical treatment of rhegmatogenous retinal detachment with severe proliferative retinopathy (stage C) using primary circumferential retinotomy, short-term perfluorocarbon liquid (PFCL) endotamponade and deferred laser endophotocoagulation in a reduced volume. To evaluate the effectiveness of the developed method in the treatment of complicated rhegmatogenous retinal detachment with severe proliferative vitreoretinopathy. Material and methods. 12 patients (12 eyes) with the diagnosis of rhegmatogenous retinal detachment with severe proliferative retinopathy were operated using developed method of two-stage surgical treatment with a reduced volume of laser endophotocoagulation. All 12 patients had a concomitant diagnosis of complicated cataract. Results. A new method of two-stage surgical treatment with reduced volume of laser endophotocoagulation was developed in the S. Fyodorov Eye Microsurgery Federal State Institution. After the follow-up period of 12 months retina was attached in all 12 cases, best corrected visual acuity (BCVA) was 0.38±0.08; 5 eyes had silicone oil endotamponade, in 7 cases silicone oil was removed. Conclusion. Primary 360-degree retinotomy is an effective method of surgical treatment of rhegmatogenous retinal detachment with severe proliferative retinopathy. The most preferable in these cases is to carry out surgical treatment in several stages with short-term PFCL tamponade, which allows to achieve maximum adaptation of the retina. Laser retinopexy in the PFCL environment during the second stage of surgery allows it to be carried out fully and at the same time in a minimal volume. Key words: retinal detachment, proliferative vitreoretinopathy, primary retinotomy, circumferential retinotomy, perfluorocarbon liquid, laser endophotocoagulation