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Al Tahan, Mohamad Anas, Ali Al-Khattawi, and Craig Russell. European Journal of Pharmaceutics and Biopharmaceutics (2024): 114619.
Mesoporous silica is widely used as a drug carrier due to its large pore volume and surface area, which enable efficient drug loading. Additionally, the silica framework helps enhance drug stability and protect against enzymatic degradation. However, without a capping material, the encapsulated drug may be released prematurely before reaching its target site. This study reports the functionalization of commercially available silica microparticles (SYLOID XDP 3050) with stearic acid at varying loading concentrations (20-120% w/w). Scanning electron microscopy (SEM) analysis showed that the pores were effectively capped with stearic acid, with the filling ratio increasing in proportion to the stearic acid concentration.
Preparation of Mesoporous SYLOID-Stearic Hybrid Formulations
Stearic acid was dissolved in ethanol at concentrations ranging from 0.6 to 14 mg/mL and stirred for 10 minutes at 25°C until completely dissolved. SYLOID XDP 3050 was then added to the stearic acid-ethanol solution, and the mixture was stirred for 2 hours at 25°C. The weight ratio of stearic acid to SYLOID varied between 20-120% w/w to investigate the effect of stearic acid concentration on the morphological properties of the silica carrier. These concentrations were chosen to ensure adequate coverage at the lower end and assess potential saturation or excess effects at the higher end. The resulting suspension was spread on a watch glass and dried in a laboratory oven at 50°C for 1 hour. After drying, the samples were stored in glass vials for subsequent characterization.
Rajić, Vladimir, et al. Colloids and Surfaces A: Physicochemical and Engineering Aspects 702 (2024): 135032.
Stearic acid (SA) has been explored as an interlayer material to enhance the stability and performance of perovskite solar cells (PSCs). In this study, ultra-thin films of stearic acid were applied at the interface between the perovskite active material (FAPbI3) and the hole transport layer (HTL) to optimize energy level alignment and improve charge transfer efficiency. By adjusting the stearic acid coverage, the interaction between the perovskite and the -COOH group of SA passivates defects on the perovskite surface and prevents moisture and oxygen ingress, thereby protecting the material from environmental degradation.
Perovskite films were fabricated using the two-step antisolvent method, followed by spin-coating SA in varying concentrations (0.1%, 0.2%, 0.5%, and 1% w/w) on the perovskite layer. The results demonstrated that the introduction of SA interlayers enhanced the energy alignment between the perovskite and HTL, reducing recombination losses and improving charge transfer across the interface. Furthermore, the SA overlayer effectively passivated Pb2+ defects, contributing to a more stable PSC performance.
This study highlights stearic acid's potential to not only improve the energy efficiency of PSCs but also extend their operational lifetime, offering a promising strategy for advancing perovskite solar cell technology.
Zhou, M. "Influence of stearic acid surface modification on flowability and agglomeration of battery grade Li2CO3 powder." Particuology (2024).
This study investigates the impact of stearic acid (SA) surface modification on the flowability and agglomeration of battery-grade Li2CO3 powder. Li2CO3, a micron-sized superfine powder, exhibits significant agglomeration due to its large specific surface area and irregular morphology, which worsens over time. The research demonstrates that stearic acid, when applied as a surface modifier, significantly improves the flow properties and reduces agglomeration.
Through the addition of varying concentrations of SA, it was found that 0.10 wt% SA led to the most stable flow behavior, maintaining a low Hausner ratio (HR) of 1.16, compared to an unmodified sample, which exhibited poor flowability with an HR increase to 1.41 over 156 days. The repose angle (AR) for the modified sample also remained excellent (28°), while the unmodified sample's AR was 49°. These improvements suggest that stearic acid effectively mitigates agglomeration, preserving flowability over extended storage.
Moreover, electrochemical testing of LiMn2O4 cathode materials synthesized from modified Li2CO3 powder showed comparable crystallinity and electrochemical performance to those prepared from commercial Li2CO3. This indicates that a small amount of stearic acid (0.10 wt%) does not adversely affect the electrochemical properties of lithium-ion batteries (LIBs).
In conclusion, stearic acid is an effective modifier for improving the flowability and anti-agglomeration properties of battery-grade Li2CO3, offering a promising solution for long-term storage stability in battery manufacturing.
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