Chain Molecules Research Articles

Molecular Simulation Study on the Aging Mechanism of NEPE Propellant Matrix

Polyethylene glycols (PEG) and toluene diisocyanate (TDI) are often used as the main components of binders and curing agents in solid propellants, and their aging is an important issue in the storage and use of propellants. To study the aging behavior and aging mechanism of nitrate ester plasticized polyether propellant (NEPE) matrix during storage, the transition states of aging reactions of binder and curing agent were optimized at the (U)B3LYP/6-311G(d,p) level of theory, and the rate coefficients over the temperature range of 298-1000 K were calculated by CVT theory. The results showed that there were five kinds of aging reactions for binder, which included decomposition, nitration, H abstraction, oxidation, and crosslinking reactions. Among them, theenergy barriers of oxidation and H abstraction reactions were relatively low (79.3-91.2 kJ·mol-1) and the main reaction types of binder aging. The main aging reaction of curing agent was decomposition. Compared with the aging reactions of binder, the energy barriers of curing agent are higher (196.6-282.7 kJ·mol-1) and the reaction is more difficult to occur. By comparing the energy barriers and rate constants of different reactions, it is found that the aging of NEPE propellant matrix can be divided into two stages. In the first stage, the propellant matrix mainly undergoes H abstraction and oxidation reaction, and as the reaction proceeds, the products crosslink to form -O-O-, -C-C-, and -C-O-C- bonds. At this time, the long chain molecules of the propellant matrix crosslink, and the molecular weight increases. This stage corresponds to the rising stage of mechanical properties in the aging process of the propellant. In the second stage, the propellant matrix mainly undergoes decomposition and nitration, resulting in degradation, the reduction of molecular weights, and the appearance of holes and microcracks in the matrix. This stage corresponds to the decline of mechanical properties in the aging process of the propellant. The above simulation results are in good agreement with the aging experimental phenomena, revealing the microscopic mechanism of the changes in the macroscopic properties of NEPE propellant during the aging process, and providing a theoretical basis for the related research on the aging properties and anti-aging technology of NEPE propellant.

Large Optical Asymmetry in Silver Nanoparticle Assemblies Enabled by CH-π Interaction-Mediated Chirality Transfer.

Transfer of asymmetry from the molecular system to the other distinct system requires appropriate chemical interactions. Here, we show how the CH-π interaction, one of the weakest hydrogen bonds, can be applied to transfer the asymmetry from π-conjugated chiral molecules to the assemblies of plasmonic Ag nanoparticles, where the aliphatic chains of chiral molecules and the polystyrene chains grafted on Ag nanoparticles are served as the hydrogen donor and acceptor, respectively. The optical asymmetry g-factor of the chiral assemblies of plasmonic nanoparticles is strongly dependent on the molecular weight of the polystyrene ligand, the core structure of the molecule, and the aliphatic chain length of the chiral molecule. Importantly, we explore a molecular mixing strategy to enhance the asymmetry g-factor of chiral molecular assemblies, which consequently promotes the g-factor of chiral plasmonics efficiently, reaching a high value of ∼0.05 under optimal conditions. Overall, we rationalize the chirality transfer from chiral molecules to inorganic nanoparticles, providing the guidance for structural design of chiral nanocomposites with a high g-factor.

A high strength, high toughness and transparent room-temperature self-healing elastomer based on the synergy effect of quadruple dynamic bonding structure

As a functional material, the transparent elastomers have been rapidly developed and applied in different fields, such as electroluminescence devices, sensors, medical and communication equipment. However, it is a huge challenge to prepare the transparent elastomers with excellent room-temperature self-healing performance and high mechanical performance. Herein, based on the synergy effect of quadruple dynamic reversible interaction, we proposed a new strategy to synthesize a room-temperature self-healing polyurethane elastomer with high strength of 15.3 MPa, high elongation at break of 1232% and high transparency. First, the polyurethane elastomer exhibited high elongation and toughness based on mechanical energy consumption from reversible fracture and reformation of sacrifice bonds, including hydrogen bonds and coordinate bonds. Moreover, the rapid reversible reaction of boronic ester bonds, oxime bonds and especially hydrogen bonds endowed the elastomer excellent self-healing performance. After introducing coordinate bonds, the elastomer exhibited high strength based on increased hard segment microdomains and the microphase separation. To further probe the mechanisms of room-temperature self-healing process and high mechanical performance, the molecular chain mobility was studied. The relationship among molecular chain mobility, molecule chain entanglement, microphase separation and aggregation structure were revealed, indicating molecular chain mobility was the key factor to self-healing performance in polyurethane elastomer.

Multifunctional Organohydrogel with Ultralow‐Hysteresis, Ultrafast‐Response, and Whole‐Strain‐Range Linearity for Self‐Powered Sensors

AbstractThe conductive hydrogels always suffered from high internal friction, large hysteresis, and low capability of accurately predicting physical deformation, which seriously restricted their application in smart wearable devices. To address these problems, solvent molecules are directionally inserted into the polymer molecule chains via bridge effect to effectively reduce the molecular internal friction. Moreover, swelling is also combined to eliminate the temporary entanglements in the hydrogel system. The cooperation between the bridge and swollen effect endows the prepared polyacrylamide (PAM)/laponite/H3BO3/ethylene glycol (Eg) organohydrogel (PLBOH) ultralow hysteresis (1.38%, ε = 100%), ultrafast response (≈10 ms), and high linearity in the whole‐strain‐range (R2 = 0.996) with a great sensitivity (GF = 2.68 at the strain range of 0–750%). Meanwhile, the prepared PL10B30OH exhibits long‐term stability, excellent stretchability, and low dissipated energy. Furthermore, the assembled triboelectric nanogenerator (TENG) displays an outstanding energy harvesting performance with an output voltage of 200 V with the size of 20 mm × 20 mm. The assembled strain sensors can monitor the small strain of facial expressions and large strain of human movements, indicating the tremendous applications in self‐powered intelligent and flexible wearable electronics under harsh environmental conditions.

Reconstruction and functionalization of aerogels by controlling mesoscopic nucleation to greatly enhance macroscopic performance

This work presents a strategy for the mesoscopic engineering of hierarchically structured sodium alginate (SA) aerogels to enhance the macroscopic performance. The strategy was implemented by meso-functionalizing and reorganizing SA aerogels via controlled heterogeneous nucleation, in which microcrystalline cellulose-manganese dioxide (MCC-MnO2) nano-crystallites worked as template. Due to the short rod-like structure and abundant hydroxyl groups of MCC-MnO2, the organized mesostructure of SA aerogels was reconstructed during the assembly of SA molecule chains, which gave rise to a significant enhancement in macroscopic performance of SA areogels. For instance, the functionalized and reconstructed MCC-MnO2/SA aerogels acquired a more than 70% increase in mechanical strength with an excellent deformation recovery. Furthermore, an almost double enhancement of removal capacity for metal ions (i.e., Cu2+ and Pb2+) and organic dyes (i.e., congo red and methylene blue) was obtained for MnO2/SA aerogels, with an 87% repossession of the pollutants removal performance after 5 operation cycles.

Effects of Thiophene Degradation on the Corrosiveness of Oil and the Properties of Oil–Paper Insulation in the Oil-Immersed Transformers

As a non-corrosive inactive sulfur, thiophene is one of the most common sulfides in mineral oil, which are retained in oil and used for improving the oxidation stability of the oil. However, thiophene may be decomposed and form low-molecular sulfide with strong corrosiveness because of rapid energy accumulation under operating conditions of the oil-immersed power transformer. Thus, this study explored the effect of thiophene degradation on the corrosiveness and properties of insulating oil under thermal and electrical aging conditions, including a case investigation of sulfur corrosion of a 500-kV electric reactor and the accelerated aging experiments of oil–paper insulation. The results showed that the degradation and pyrolysis of thiophene depend on energy accumulation induced by thermal and electric fields in the oil-immersed transformers. Under the premise of thiophene without degradation and transformation, thiophene can still delay the deterioration of insulating oil due to its high oxidation resistance. The continuous energy accumulation induced by thermal and electric fields may cause the molecular chains of thiophene molecules to break and form some corrosive low-molecular sulfides, thereby resulting in the increase of the corrosiveness of oil, the decrease of the properties of oil–paper, and posing a huge corrosion threat to the oil-immersed transformer.

Defect control for high-efficiency all-inorganic CsPbBr3 perovskite solar cells via hydrophobic polymer interface passivation

All-inorganic CsPbBr3-based perovskite solar cells (PSCs) have been proved to possess upgraded humidity and thermal stability. However, the CsPbBr3-based PSCs with a typical device configuration without hole transport layer (HTL) suffer from serious carrier recombination as a result of high interfacial defect density, which limits the enhancement of photoelectric conversion efficiency (PCE). To settle this issue, an interfacial engineering methodology is imported by utilizing polymethyl methacrylate (PMMA) as a passivation layer between the CsPbBr3 film and the carbon electrode. Through the interaction within the uncoordinated Pb2+ ions and oxygen atoms of carbonyl (CO) in the PMMA molecule chains, the trap sites existed in the modified CsPbBr3 interface can be greatly suppressed, beneficial for a faster extraction and transportation of photogenerated carriers. Besides, the PMMA interlayer can raise the valence band of the CsPbBr3 surface for a better energy level alignment, and simultaneously portray as a protective layer against moisture owing to the hydrophobic nature of long-chain polymers. Ultimately, the PMMA modified device exhibited a champion PCE of 9.60 % with a high open-circuit voltage (VOC) of 1.58 V, as well as showcasing ignorable PCE loss enduring over 400 h of aging.

Molecular dynamics investigation on the vapor–liquid interface behavior of long-chain alkanes, alcohols, and their mixtures

The accurate description of the liquid–vapor interface behavior of higher alkanes and alcohols is an important topic in many petroleum and chemical industries. This research provides molecular-level information on the vapor–liquid interfaces (phase behavior, surface tension, self-diffusion, and solvation structure). Through the use of molecular dynamics simulation, five selected long-chain alkanes (n-dodecane, 5-methyl-undecane), alcohols (1-dodecanol, 1,12-dodecanediol, and 2-butyl-1-octanol), and their mixtures (n-dodecane + 1-dodecanol or 1,12-dodecanediol) have been modeled over a broad temperature range from 323.15 to 573.15 K. The aforementioned properties are qualitatively reproduced using the Optimized Potential for Liquid Simulations–All Atom (OPLS and L–OPLS) and the Transferable Potential for Phase Equilibria–United Atom (TraPPE–UA) force fields, respectively. The current findings are in good agreement with earlier experimental measurements as well as other simulated results. Moreover, the molecule orientations and chain conformation in the bulk liquid area are fully investigated by monitoring the center-of-mass radial distribution function and the probability distributions of end-to-end lengths for certain components. All five hydrocarbons exhibit equivalent propensities for ordering and chain conformation at the interface when subjected to the same isotherm. In addition, we compare the physical and structural characteristic of the unary and binary systems at the same temperature to further investigate the process by which molecular arrangement affects macroscopic thermophysical features. These simulations will provide specific guidance for choosing these widely used force fields to study petrochemical technologies.

Localization of Chicken Rab22a in Cells and Its Relationship to BF or Ii Molecules and Genes.

Rab22a is an important small GTPase protein the molecule that is involved in intracellular transportation and regulation of proteins. It also plays an important role in antigens uptake, transportation, regulation of endosome morphology, and also regulates the transport of antigens to MHC (Major Histocompatibility Complex) molecules. To investigate the role of Rab22a, the intracellular co-localization of chicken Rab22a (cRab22a) molecule and its relationship to BF and chicken invariant chain (cIi) molecules was studied. A 3D protein structure of Rab22a was constructed by using informatics tools (DNASTAR 4.0 and DNAMAN). Based on the model, the corresponding recombinant eukaryotic plasmids were constructed by point mutations in the protein's structural domains. HEK 293T cells were co-transfected with plasmids pEGFP-C1-cIi to observe the intracellular co-localization. Secondly, the DC2.4 Mouse Dendritic Cell and Murine RAW 264.7 cells were transfected with recombinant plasmids of pmCherry-cRab22a and pmCherry-mRab22a respectively. Subsequently, the intracellular localization of cRab22a in early and late endosomes was observed with specific antibodies against EEA1 and LAMP1 respectively. For gene expression-based studies, the cRab22a gene was down-regulated and up-regulated in HD11 cells, following the detection of transcription levels of the BFa (MHCIa) and cIi genes by real-time quantitative PCR (RT-qPCR). The interactions of the cRab22a gene with BFa and cIi were detected by co-immunoprecipitation (Co-IP) and Western blot. The results showed that the protein structures of chicken and mouse Rab22a were highly homologous (95.4%), and both localize to the early and late endosomes. Ser41 and Tyr74 are key amino acids in the Switch regions of Rab22a which maintain its intracellular localization. The down-regulation of cRab22a gene expression significantly reduced (p < 0.01) the transcription of BFa (MHCIa) and cIi in HD11 cells. However, when the expression of the cRab22a gene was increased 55 times as compared to control cells, the expression of the BFa (MHCIa) gene was increased 1.7 times compared to the control cells (p < 0.01), while the expression of the cIi gene did not significantly differ from control (p > 0.05). Western blot results showed that cRab22a could not directly bind to BFa and cIi. So, cRab22a can regulate BFa and cIi protein molecules indirectly. It is concluded that cRab22a was localized with cIi in the endosome. The Switch regions of cRab22a are the key domains that affect intracellular localization and colocalization of the cIi molecule.

Thermal stress calculation of wax-based warm mix asphalt considering thermorheologically complex behavior

The warm mix asphalts which reduce the environmental pollution always show thermorheologically complex behavior under the realistic working conditions (the long-term loading at the low temperature) in the cold region. However, many scholars ignore the thermorheologically complex behavior when calculating thermal stresses. In this paper, the new thermal stresses calculation method considering thermorheological complexity of four wax-based warm mix additives (Fischer-Tropsch (F-T) based wax, fatty acid amides (FAA) based wax, polyethylene (PE)-based wax, and linear aliphatic hydrocarbon (LAH)-based wax) modified asphalt binders were proposed, which was the process of incremental iterative (Named as ‘the incremental method’). The results show that the warm mix asphalt exhibits the thermorheologically complex behavior under long-term loading condition at the low temperature through the tail of the master curve of stiffness modulus, and the thermal stresses considering thermorheologically complex characteristics calculated by the incremental method are greater than that calculated by the traditional Monismith method. Therefore, the incremental method should be used to calculate the thermal stress of asphalt binders under the long-term loading condition instead of the Monismith method, otherwise the cracking risk of the asphalt binder will be underestimated. The wax-based warm mix additives with longer chain molecules and cold storage time can increase the thermorheological complexity more evidently, and the thermal stresses of asphalts with thermorheologically complex characteristics are more sensitive to cooling rate. All in all, the proposed incremental method will provide a supplement to the calculation method of the thermal stresses in the asphalt binder.

Pressure-driven flow behavior of small molecules through a carbon nanotube

In this research, the flow behavior of ring and chain molecules through a carbon nanotube (CNT) driven by pressure has been investigated using molecular dynamics (MD) simulations. We have examined the distribution of fluid molecules and the flow process confined in the CNT. We also calculated the radial count profiles, the axial density distributions, molecular conformation and fluid flux. Our results revealed that a sudden pressure applied on fluid molecules will lead to inrush of fluid inside nanoscale channels. The fluid molecules confined in the CNT formed an interfacial layer near the CNT inner surface. That of toluene system is closer to the CNT wall than heptane system. The results also indicated that plane of toluene molecules in interfacial layer is parallel to the CNT wall. The distributions of the others are disordered. The heptane molecules formed four cylindrical layers inside the CNT. The molecules in interfacial layer are parallel to the CNT wall.

Thermal degradation mechanisms of the cured phenolic triazine thermoset resin (PT30) studied under nitrogen.

The non-isothermal thermal degradation of the cured phenolic triazine thermoset resin (PT30) was considered under nitrogen atmosphere. Thermogravimetric analyses (TGA) showed that the degradation mechanism was decomposed in three main steps occurring at 440°C, 550°C, and 720°C. To understand the chemical reactions that happen, TGA experiments were coupled with the analyses of the gaseous products by Fourier transform infrared detection (TGA/FTIR) and by mass spectrometry (TGA/MS). A degradation mechanism is proposed based on these experimental results and on Density Functional Theory (DFT) calculations. It was found that carbon dioxide is the main degradation product generated by the oxygen-carbon chain scissions. In the second step, triazine rings’ rupture led to the formation of cyanide hydrogen and probably cyanic/isocyanic acid. Then, various aromatic compounds are produced from chain scissions and molecules’ recombination. Analyses of these degradation products contributed to proposing assumptions of thermal degradation mechanisms of the PT30 resin.

A comprehensive rotational study of astronomical iso-pentane within 84 to 111 GHz

The rotational line survey by ALMA (Atacama Large Millimeter/submillimeter Array) recently revealed the presence of i-C3H7CN (i-PrCN) and n-C3H7CN (n-PrCN) in 3-mm atmospheric window between 84 to 111 GHz towards the hot core region Sagittarius B2(N) (Sgr B2(N)). This was the first interstellar detection of a linear straight chain molecule. In this light, we report the rotational spectra of C5H12 isomeric group in the same frequency range. We performed quantum chemical calculations for spectroscopic parameters. The pure rotational spectrum of the species has been simulated using the PGOPHER program. The rotational spectrum of this molecule makes it a good candidate for future astronomical detections since the radio lines can be calculated to very high accuracy in mm/sub-mm wave region.

Structural evolution of water-in-propylene carbonate mixtures revealed by polarized Raman spectroscopy and molecular dynamics.

The liquid structure of systems wherein water is limited in concentration or through geometry is of great interest in various fields such as biology, materials science, and electrochemistry. Here, we present a combined polarized Raman and molecular dynamics investigation of the structural changes that occur as water is added incrementally to propylene carbonate (PC), a polar, aprotic solvent that is important in lithium-ion batteries. Polarized Raman spectra of PC solutions were collected for water mole fractions 0.003 ≤ χwater ≤ 0.296, which encompasses the solubility range of water in PC. The novel approach taken herein provides additional hydrogen bond and solvation characterization of this system that has not been achievable in previous studies. Analysis of the polarized carbonyl Raman band in conjunction with simulations demonstrated that the bulk structure of the solvent remained unperturbed upon the addition of water. Experimental spectra in the O-H stretching region were decomposed through Gaussian fitting into sub-bands and comparison to studies of dilute HOD in D2O. With the aid of simulations, we identified these different bands as water arrangements having different degrees of hydrogen bonding. The observed water structure within PC indicates that water tends to self-aggregate, forming a hydrogen bond network that is distinctly different from the bulk and dependent on concentration. For example, at moderate concentrations, the most likely aggregate structures are chains of water molecules, each with two hydrogen bonds.

Modulation of the magnetic dynamics in two air-stable sulfur-ligated dysprosium complexes via polymerization.

Two air-stable sulfur-ligated dysprosium(III) complexes [HN(Et)3][Dy2NaL8] (1) and [DyNaL4(MeOH)x(H2O)2-x]n (2) based on 2-pyridinethiol 1-oxide (HL) were synthesized and structurally characterized. Discrete 1 and polymeric 2 share the same anionic unit of [DyL4]- with the O4S4 coordination environment, but differ in the precise geometry with triangular dodecahedron geometry in 1 and biaugmented trigonal prism geometry in 2. The subtle change leads to observable temperature-independent relaxation for 2 while a faster relaxation with invisible peak for 1 at zero dc field. Under an optimal dc field, both display the typical Raman process with a smaller pre-factor and higher exponent for 2. Ab initio calculations reveal that the predicted energy barriers are 287 cm-1 for 1 and 303 cm-1 for 2. These results demonstrate the construction and magnetic modulation of air-stable sulfur-ligated Dy-SMM architectures.

Synthesis, crystal structure, molecular dynamics, docking and in-vitro studies of cyclododecanonethiosemicarbazone, a promising anti tuberculosis agent

Cyclododecanonethiosemicarbazone (CDT), crystallises in triclinic crystal system in spacegroup P-1 having unit cell parameters as a = 5.6152(2)Å, b = 8.3747(4) Å, c = 16.1901(7) Å, α = 91.186(2)°, β = 90.880(2)° and γ = 108.014(2)°, V = 723.68(5) Å3 and Z = 2.The macrocyclic ring structure shows close resemblance to the most stable conformation for a 12 membered aliphatic cyclic ketone, where three C-C bonds are present on each side of the heavy atom framework's square structure. Existence as thione form of the compound is confirmed by IR, NMR and Crystallographic data. There is extensive electron delocalisation along its thiosemicarbazone moiety. A number of short term interactions, including three intermolecular H-bonding interactions involving each S, forms infinite interlinked chains of molecules along a axis. Results of anti tuberculosis activity studies reveal that minimum inhibitory concentration (MIC) of CDT is 800 µg/mL for the test organism Mycobacterium smegmatis. Hirshfeld surface analysis, docking and molecular dynamics studies suggest stable protein –ligand binding with the related 1TEX protein.

Uticaj industrijskih nusproizvoda na svojstva geopolimernih kompozita na bazi elektrofilterskog pepela

Geopolymers are materials made of chain molecules incurred by polymerization of geopolymer binders. geopolymers are defined as a solid and stabile aluminosilicate materials, made of industrial byproducts and liquid solutions. The experimental part of the dissertation, contains the results of physical-mechanical, microscopic and durability properties of geopolymer mortars and concrete based on fly ash. For the purpose of determining the effect of different byproducts on characteristics of geopolymer mixtures, 24 batches of mortar and 8 batches of concrete were made and tested. (converter slag, wood biomass ash, red mud, and waste glass) in the amount of 5% - 100% with different steps of replacement in relation to to the binder mass. The samples of geopolymer mortar and concrete were cured at an ambient temperature According to the test results some recommendations for the possible application of fly ash and other industrial byproducts for making geopolymer mortars and concretes are made. Tested materials might be used as construction building materials and according to their physical-mechanical characteristics and durability properties, they can be alternative solution for the traditional mortar and concrete mixtures.

Efficient extraction of diesel oil from waste plastics: A comprehensive study

Since crude oil serves as the initial material for plastic production, the reverse processing of plastic back into crude oil represents an innovative method employed in the present work for improved plastic disposal. Initially, the long-chain molecules of waste plastics are broken down into shorter chain molecules, which are then further fragmented into smaller molecules using a catalytic cracker. The resulting product is a mixture of oils including gasoline, diesel, kerosene, and similar substances. The machinery and processes involved in oil production are entirely based on environmentally friendly principles. Plastics suitable for conversion into oil include propylene, used garbage bags, cookie packaging, CD cases, polyethylene found in vinyl bags, medical products, PET bottle caps, and polystyrene used in cup noodle bowls, lunch boxes, Styrofoam, etc. In addition to addressing the challenges of plastic waste management, the innovative process outlined in this work underscores a commitment to environmentally conscious practices. By employing catalytic cracking and adhering to sustainable principles throughout the oil production process, the conversion of waste plastics into valuable resources not only mitigates environmental impact but also contributes to the circular economy. The types of plastics suitable for this conversion encompass a wide range of commonly used materials, further highlighting the potential for widespread adoption and impact in reducing plastic pollution. Through this approach, the journey from crude oil to plastic and back to oil demonstrates a holistic and efficient method for managing plastic waste while promoting sustainable resource utilization.

In-situ surface defects passivation with small carbon chain molecules for highly efficient, air-processed inorganic CsPbI2Br perovskite photovoltaics

All-inorganic CsPbI2Br perovskites have gained enormous interests owing to suitable band gap and thermal stability. However, the CsPbI2Br suffers from unsatisfactory crystal growth and poor surfaces processed under ambient conditions. Herein, we introduced small carbon chain molecules as liquid additives including diiodomethane (DIM), dibromoethane (DBM), and dichloromethane (DCM) into the precursor. The halide ions as associated with these additives played vital roles to passivate the surface defects. Interestingly, DIM additive offers multiple benefits: (i) passivate uncoordinated Pb2+ dangling bonds (ii) match band energy alignment, (iii) assist to preferential oriented crystal growth (iv) suppress halide ion vacancies and (v) improve surface morphology. As a result, 100 μl DIM-assisted perovskite solar cell (PSC) exhibited the highest power conversion efficiency (PCE) of 16.42 % which is higher than that of control (13.95 %). Notably, with additive engineering approach our champion PCE (16.42 %) is the highest to date under processing at ambient conditions. On the contrary to poor stability of control PSC (PCE drop of ∼ 50 %), the DIM assisted PSC retained ∼ 80 % of original PCE after aging for 600 hrs. Thus, our photovoltaic results demonstrated that the additive method could open an effective route for development of efficient and stable PSCs under ambient conditions.

Influence of different anionic polysaccharide coating on the properties and delivery performance of nanoliposomes for quercetin

Nanoliposome is an effective delivery system for polyphenols, whereas it always suffers from low electrostatic stability and oxidation of lipid membranes. Here, different charged anionic polysaccharides including carrageenan (−62.67 ± 1.85 mV), trehalose (−20.73 ± 1.42 mV), and pectin (−4.47 ± 0.38 mV) were used as coating material to improve the stability of nanoliposomes. Results showed that carrageenan coating greatly inhibited aggregation and fusion of nanoliposome. The coating of the higher charged polysaccharides produced the more hydrogen bonds and made the inner chains of lipid molecules more compact, thus improving the rigidity of the membrane and thermal stability. In addition, the polysaccharide coating effectively reduced the lateral diffusion within the membrane and the propagation rate of oxidation reaction. The aim of this study is to investigate the effect of anionic polysaccharides with different charges on coated nanoliposomes, provide reference for the delivery of quercetin.