Environmental Protection Research Institute of Light Industry

Abstract Based on the advantages of Graphene(Gr), such as low cost, high conductivity, low oxidation resistance and high chemical stability, Gr ink is prepared: Gr dispersion was prepared in isopropyl alcohol and water by adding polyvinylpyrrolidone (PVP) and sodium dodecyl sulfonate (SDS).By studying the stability of Gr dispersions, the optimal dispersants and proportions were further screened, and different concentrations of Gr inks were prepared on the basis of the optimal dispersants and proportions. The particle size, viscosity, surface tension, density, pH, conductivity and other physical and chemical properties of Gr ink were tested. The experimental results showed that (1) The dispersion effect of PVP was better than that of SDS. With the increase of PVP ratio, the stability time of the dispersion solution first increased and then stabilized, and the optimal dispersion ratio was obtained as W Gr : W PVP = 2:1. (2) The concentration of Gr is positively correlated with the physical and chemical properties such as density, viscosity and particle size. With the increase of graphene concentration, the density, viscosity and particle size all increase. The surface tension is greatly affected by solvent properties. (3) After calculation and comparison of ink rheological properties, isopropyl alcohol (IPA) as solvent group, Gr 35 mg/mL and 50 mg/mL, meet the requirements of commercial printing; IPA-H 2 O was the solvent group. Except for the Gr concentration of 50 mg/mL, serious shear conversion behavior appeared. The Gr inks with other concentrations had good compatibility with the nozzle, which was suitable for inkjet 3D printing technology.

Liposomes were extensively used for cosmetics and pharmaceuticals due to their versatility, biocompatibility, and biodegradability, as well as the ability to encapsulate water-soluble and fat-soluble substances. However, some challenges remain unsolved, including poor stability, complex preparation process, limited encapsulation efficiencies (EE%) and drug loading capacity (DLC%). We herein prepared universal liquid proliposomes by rotary evaporation method and optimized formulations with different pH, glycerol content, ethanol content and preparation process. The EE% of water-soluble substances was above 85%, and the maximum DLC% was 37.5%. In 7 different conditions, the optimal formulation of the proliposomes remained stable over 60 days. The excellent stability of proliposomes and nicotinamide liposomes and their essence, when applied to cosmetic formulations, was confirmed by the Turbiscan stability analyzer. The proposed universal liquid proliposomes can form liposomes encapsulating a variety of water-soluble substances rapidly, making them an accessible and versatile tool for improving the stability and applicability of water-soluble raw materials.

ABSTRACT This study developed a novel cooling agent based on smart encapsulation technology and systematically evaluated its efficacy and performance characteristics. The active component of the cooling agent specifically targets the cold‐sensing receptor TRPM8, triggering neural signal transmission to the central nervous system and thereby inducing a neurophysiological cooling sensation. The intensity of the cooling response was positively correlated with the concentration of the agent, whereas its duration remained consistent across concentrations, lasting between 1.5 and 2.5 h. In comparison with other cooling ingredients, the developed cooling agent exhibited significant advantages in both the intensity and persistence of the cooling effect. The formulation employs an intelligent water‐triggered release mechanism that effectively extends the release time of the cooling components. Consequently, the cooling agent delivers a strong and sustained cooling effect without causing skin irritation. These attributes underscore its broad application potential in cosmetics, food, and daily chemical products.

The design of public-key cryptography algorithm based on LWE hard problem is a hot topic in the field of post-quantum cryptography. In this paper, we design a new homomorphic encryption algorithm based on LWE problem. Firstly, to solve the problem that the existing encryption algorithms can only encrypt a single 0 or 1 bit, a new encryption algorithm based on LWE over integer is proposed, and its correctness and security are proved by theoretical analysis. Secondly, an additive homomorphism algorithm is constructed based on the algorithm, and the correctness of the algorithm is proved. The homomorphism algorithm can carry out multi-level homomorphism addition under certain parameters. Finally, the public key cryptography algorithm and homomorphic encryption algorithm are simulated through experiments, which verifies the correctness of the algorithm again, and compares the efficiency of the algorithm with existing algorithms. The experimental data shows that the algorithm has certain efficiency advantages.