POLYMER
·
2022
·
IF 4.432
Bo Zhang,Songyue Liu,Lijie Yin,Ming Tian,Nanying Ning,Liqun Zhang,Wencai Wang
The reaction mechanism and the interfacial modulus gradient of the interfacial transition layer between the environmentally friendly dipping system (PAL) and the rubber have not been fully studied. In order to better understand the chemical structures and nano-mechanical properties of the interface between the dip layer and the rubber, we used advanced atomic force microscope (AFM) and nanoscale Fourier transform infrared spectroscopy (nano-FTIR) to perform detailed analysis in this article. The characterization of interfacial nano-mechanical properties and chemical structures is very significant for the illustration of interfacial adhesion mechanism. AFM can effectively characterize the detailed interfacial modulus gradient and the thickness of interface, while nano-FTIR can comprehensively measure the interfacial chemical structures and the distribution of chemical bonds. The results suggest that the thickness of the interface between the PAL dip layer and the rubber matrix is 175 nm, and the crosslinking density of the interfacial layer is high, which explains that the failure location of fiber/rubber composites after pull-out tests occurs on the side of the rubber matrix. Similarly, the microstructure of resorcinol-formaldehyde-latex (RFL) system was also characterized, and the preparation of RFL usually requires carcinogenic and toxic substances such as formaldehyde and resorcinol .
研究领域:
材料科学
·
复合材料
·
纳米技术
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Junhui Yang,Cuicui Ding,Lele Tang,Feng Deng,Qili Yang,Hui Wu,Lihui Chen,Yonghao Ni,Liulian Huang,Min Zhang
Because of poor water solubility and low thermostability, the application of collagen is limited seriously in fields such as injectable biomaterials and cosmetics. In order to overcome the two drawbacks simultaneously, a novel bifunctional modifier based on the esterification of polyacrylic acid (PAA) with N-hydroxysuccinimide (NHS) was prepared. The esterification degree of PAA-NHS esters was increased upon increasing the NHS dose, which was confirmed by Fourier-transform infrared (FTIR) and nuclear magnetic resonance spectrascopy. FTIR results indicated that the triple helix of the modified collagens remained integrated, whereas the molecular weight became larger, as reflected by the sodium dodecyl sulfate–polyacrylamide gel electrophoresis pattern. The modified collagens displayed excellent water solubility under neutral condition, owing to lower isoelectric point (3.1–4.3) than that of native collagen (7.1). Meanwhile, denaturation temperatures of the modified collagens were increased by 4.8–5.9 °C after modification. The modified collagen displayed hierarchical microstructures, as reflected by field-emission scanning electron microscopy, while atomic force microscopy further revealed a “fishing net-like” network in the nanoscale, reflecting a unique aggregation behavior of collagen macromolecules after modification. As a whole, the PAA-NHS ester as a bifunctional modifier endowed collagen with desired water solubility and thermostability in a conflict-free manner, which was beneficial to the process and application of the water-soluble collagen.
研究领域:
生物材料
·
化妆品
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongju Qiu,Weiwei Huang,Yanqiong Zhang,Jin Chen,Lei Gao,Mamdouh Omran,Li Nan,Guo Chen
In the family of inorganic nanomaterials , zirconia is a highly promising functional ceramic with a high refractive index , hardness, and dielectric constant, as well as excellent chemical inertness and thermal stability. These properties are enhanced in nano-zirconia ceramics, because nanopowders have a small particle size, good morphology, and uniform and dispersive distribution. In this study, a co-precipitation process was proposed to synthesise highly dispersed MgO–Y 2 O 3 co-stabilized ZrO 2 nanopowders. The effects of different calcination temperatures on the crystallisation degree and particle dispersion of zirconia nanopowders were characterised by X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC), Raman spectroscopy , Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption using the Brunauer–Emmett–Teller (BET) theory, transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM). The optimum synthesis conditions were obtained as follows: 6 h of high-energy planetary grinding and calcination at 800 °C in an electric furnace. Under these optimum conditions, the average particle size of the prepared powder was 28.7 nm. This process enriches the literature on the controllable preparation of Mg–Y/ZrO 2 nanopowders obtained by the co-precipitation method.
研究领域:
材料科学
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纳米技术
·
陶瓷工程
·
化学工程
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Bin Hu,Xinhuan Niu,Jiakai Zhou,Changxin Dong,Chao He,Xinjie Li,Zheng Wu,Jiahui Li
The development of sapphire slurry follows the principles of compositional simplification, environmental sustainability, and high efficiency with low cost. This study systematically investigated the effects of polyhydroxyamine pH regulators, 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1,3-propanediol (AMPD), and tris(hydroxymethyl)aminomethane (TRIS), on the polishing performance of C-, R-, and M-plane sapphire substrates. The results demonstrated that TRIS exhibited the highest efficacy, achieving material removal rates (MRRs) of 5.512 µm/h, 3.422 µm/h, and 4.541 µm/h for C-, R-, and M-plane sapphire, respectively, while reducing surface roughness (Sq) to 0.191 nm, 0.178 nm, and 0.184 nm. Tribological analysis, SEM characterization, zeta potential measurements, particle size distribution tests, and spectroscopic techniques (UV-Vis, XPS, and FTIR) were employed to elucidate the mechanical and chemical mechanisms governing material removal. All three pH regulators can also function as complexing agents, forming complexes with Al OH 4 − , with TRIS demonstrating the strongest chelation capability. Density functional theory (DFT) calculations further verified these findings, revealing that TRIS possesses the highest number of reactive sites. The consistency between computational and experimental results established a quantitative structure-performance relationship. This work provides a green and efficient paradigm for the precision machining of hard, brittle materials.
研究领域:
材料科学
·
表面工程
·
半导体制造
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计算化学
·
机械工程
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiumei Liu,Ying You,Wenkang Yang,Liujin Yang,Xinyue Zhang,Ziyu Qin,Xueqiong Yin
A thermosensitive amidoxime-based hydrogel named PAOU was prepared from polyamidoxime through ion-imprinted polymerization, with UO 2 2+ as the template ions and N-isopropylacrylamide as the monomer. The PAOU was characterized by DSC, FTIR, SEM/EDS, XPS and Raman spectroscopy. PAOU expressed phase transition at 29.76 °C (exothermic peak) and 39.64 °C (endothermic peak), respectively, and still maintained good reversible thermosensitivity after five cycles of heating and cooling. The maximum adsorption capacity of PAOU (dry weight 10 mg) was 856.47 mg/g after adsorption for 50 min at 50 °C, pH 4.5, 80 mL 0.5 mg/mL UO 2 2+ solution. The quasi-second-order kinetic equation and the Langmuir adsorption isotherm model were both followed by the adsorption of UO 2 2+ by PAOU. The thermodynamic parameters indicated that the adsorption process of PAOU was endothermic (Δ H θ = 27.04 kJ/mol) and spontaneous (Δ G θ = −19.17 kJ/mol). After five cycles of adsorption–desorption experiments on PAOU under optimal adsorption conditions, the adsorption capacity of PAOU was 704.32 mg/g, being 82.23 % of the first adsorption capacity. The adsorption selectivity coefficients of PAOU in seven kinds of mixed metal ion solutions were 1.61 ∼ 42.04. It outperformed its non-imprinted equivalent in terms of adsorption selectivity. The adsorbent also showed good uranium adsorption ability in natural seawater.
研究领域:
材料科学
·
环境化学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Renjie Chen,Xinyu Huang,Ruizhi Zheng,Delong Xie,Yi Mei,Ruqiang Zou
Organic phase change materials are flammable, which limits their applications in heat storage and conversion. In the presented study, a phosphorus-grafted hexadecanol was blended with pentaerythritol phosphate (PEPA) to prepare flame-retardant phase change material (FRPCM). The thermal properties of FRPCM were evaluated by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and cone calorimetry. The flame-retardant mechanism was examined by thermogravimetric analysis-Fourier transform infrared spectrometry (TG-FTIR) and scanning electron microscopy (SEM) tests. The FRPCM maintains a promising heat storage capacity (186.9 J/g) and thermal stability after grafting and blending. The flame retardance analysis reveals that the grafted phosphorus group helps to promote char formation. PEPA extends the time before exposed combustible material ignites. The cone calorimeter test demonstrated that the peak heat release rate and total heat release are further decreased by more than 50%, owing to the synergistic effect between the phosphorus group and PEPA. The SEM results showed that a porous structure is formed during combustion. Self-extinguishment testing indicates that the FRPCM is extinguished in a much shorter time than is hexadecanol.
研究领域:
材料科学
·
热能工程
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Nano
·
2022
·
IF 13.364
J. Wu,P. Wu,X. Weng,J. Lin,G. Owens,Z. Chen
Recently, the green synthesis of iron nanoparticles and associated hybrids using plant extracts has attracted much attention due to its low cost, simplicity and environmental friendliness . However, the exact formation mechanism is still unclear. In this study, the one step green synthesis of hybrid rGO/Fe NPs by a tea extract was examined using a response surface methodology (RSM) to obtain a high activity of rGO/Fe NPs. The results showed that the best conditions for synthesis were an extract concentration = 35 g/L, pH = 7, and temperature = 30 °C. The optimized hybrid produced could remove 99.9% of mitoxantrone (MTX) compared to only 78.9% when unoptimized. To better understand the formation process, characterizations by SEM , TEM, AFM , FTIR, XRD , Raman, and XPS were performed. Theses characterizations showed that the Fe NPs produced had a particle size of 25 nm which were deposited randomly across the rGO nanosheet with a thickness of approximately 1.5 nm, indicating that stable hybrid rGO/Fe NPs were successfully synthesized, where the green tea extract exhibited both reducing and capping/stabilizing behavior. Furthermore, the specific biomolecules in the green tea extract responsible for bio-reduction and stabilization were identified by GC-MS and LC-MS, which showed that catechins were the main reducing agents, while alkaloids, amino acids and phenolic acids were the main capping/stabilizing agents. Finally, a mechanism for synthesizing rGO/Fe NPs was proposed, where the polyphenols successfully reduced GO and complexed with iron ions to form amorphous ferric (and ferrous) polyphenol complex nanoparticles.
研究领域:
材料科学
·
纳米技术
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Shiyun Zhou,Tian Xia,Shuo Wu,Wanting Zhang,Jianhui Xu,Yi Yang,Youbing Li,Guangxian Li
Self-healing bitumen can significantly enhance the durability and service life of bituminous pavement, thereby reducing the need for frequent maintenance and repairs. In this study, isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), and isophorone diamine (IPDA) were utilized to design asymmetric dynamic hard segments, imparting self-healing properties to polyurethane even at room temperature. Particular emphasis was placed on hydrogen bonding, as its reversible formation serves as a primary mechanism for the self-healing characteristics of the material. During the synthesis of polyurethane (PU), two different composition ratios were employed to produce two types of PU with distinct chemical structures, molecular weights, and dynamic crosslink densities, which were characterized using NMR, FTIR, GPC, and DMA, respectively. Furthermore, these two PU types exhibited varying mechanical properties and glass transition temperatures, leading to differences in the rheological properties of the corresponding PU-modified bitumen. Dynamic frequency sweep test results indicated that bitumen modified with PU exhibiting higher molecular weight and narrower molecular weight distribution had superior rutting resistance and enhanced room-temperature self-healing capabilities. The underlying reasons for this improvement can be attributed to the hydrogen bonding present in the PU as well as the phase separation structure between the PU and bitumen.
研究领域:
材料科学
·
高分子化学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2024
·Vol. 16
·期 19
·8568
·
IF 3.3
Yuan-Yuan Wang,Dan-Feng Zhang,Hong-Rui Zhang,Wen-Jun Liu,Zhi-Quan Chen,Jun-Cheng Jiang,Lei Ni
In this study, sodium dodecylbenzene sulfonate was used as a stabilizer, and NaOH, TBHP, and benzoyl chloride were used as reactants in the preparation of tert–butyl peroxybenzoate (TBPB) using a two–step process. The process conditions were optimized by a three–factor, three–level Box–Behnken design approach. The results showed that the yield of TBPB achieved 88.93% under the optimum conditions of temperature of 31.50 °C, feeding time of 22.00 min, and NaOH concentration of 15%. The exothermic properties of the synthesis of TBPB were investigated using reaction calorimetry. The thermal decomposition characteristics of reactants and products were analyzed by differential scanning calorimetry (DSC) and accelerating rate calorimetry (ARC), and the changes in substance types, characteristic peaks, and exothermic quantities during the reaction were analyzed before and after the reaction by FTIR. The reaction mechanism was proposed by combining EasyMax 102, RC1e, gas chromatography (GC), and Fourier transform infrared spectrometry (FTIR). A comprehensive study of the reaction mechanism and reaction exotherm was carried out using density functional theory (DFT) to predict the reaction energy change and the direction of the reaction and to determine whether the reaction was reversible or not. The risk level for the synthesis of TBPB in semi–batch mode was evaluated using a risk matrix and the Stoessel criticality diagram. The optimal conditions for the TBPB synthesis process in a plate microreactor were explored. Both microreactors and semi–batch modes were comparatively analyzed using the m–ITHI quantitative assessment method. The results indicated a hazard class 2 in semi–batch mode and a hazard class 1 in the microreactor. The results of the study may provide a reference for the further improvement of the intrinsically safe design of the synthetic TBPB process.
研究领域:
化学工程
·
过程安全
·
热分析
·
反应工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 2
·322
·
IF 4.324
Lin-Fei Chen,Pei-Yao Xu,Chao-Ping Fu,Ranjith Kumar Kankala,Ai-Zheng Chen,Shi-Bin Wang
Due to its hydrophobicity, fisetin (FIS) often suffers from several limitations in terms of its applicability during the fabrication of pharmaceutical formulations. To overcome this intrinsic limitation of hydrophobicity, we demonstrate here the generation of poly (vinyl pyrrolidone) (PVP)-encapsulated FIS nanoparticles (FIS-PVP NPs) utilizing a supercritical antisolvent (SAS) method to enhance its aqueous solubility and substantial therapeutic effects. In this context, the effects of various processing and formulation parameters, including the solvent/antisolvent ratio, drug/polymer (FIS/PVP) mass ratio, and solution flow rate, on the eventual particle size as well as on distribution were investigated using a 23factorial experimental design. Notably, the FIS/PVP mass ratio significantly affected the morphological attributes of the resultant particles. Initially, the designed constructs were characterized systematically using various techniques (e.g., chemical functionalities were examined with Fourier-transform infrared (FTIR) spectroscopy, and physical states were examined with X-ray diffraction analysis (XRD) and differential scanning calorimetry (DSC) techniques). In addition, drug release as well as cytotoxicity evaluations in vitro indicated that the nanosized polymer-coated particles showed augmented performance efficiency compared to the free drug, which was attributable to the improvement in the dissolution rate of the FIS-PVP NPs due to their small size, facilitating a higher surface area over the raw form of FIS. Our findings show that the designed SAS process-assisted nanoconstructs with augmented bioavailability, have great potential for applications in pharmaceutics.Keywords:supercritical fluid technology;fisetin;nanofabrication;antitumor
研究领域:
药学
·
纳米技术
·
药物递送系统
·
癌症研究
·
超临界流体技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2014
·
IF 3.96
Xiuzhen Wei,Songxue Wang,Yingying Shi,Hai Xiang,Jinyuan Chen,Baoku Zhu
A positively charged composite nanofiltration (NF) hollow fiber membrane was prepared by interfacial polymerization with polyethyleneimine (PEI) and trimesoyl chloride (TMC) as the reactive monomers . The preparation conditions were optimized, and a relatively simple preparation process was developed. In the optimized preparation process, Na 3 PO 4 is not needed and the heat-treatment process can be omitted, which saves operation time and reduces cost. The surface morphology and chemical structure of the resulting composite NF membrane were characterized by scanning electron microscopy (SEM), attenuated total reflectance-Fourier transform infrared (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). Pure water flux , contact angle, molecular weight cut-off (MWCO) and surface zeta potential of the composite NF membrane were also evaluated. The rejection of the NF membrane for MgCl 2 (1 g/L aqueous solution at 0.4 MPa) was above 97.0%, and the permeate flux was approximately 35.3 L/m 2 h. Furthermore, the NF membrane also showed excellent rejection performance for different dye molecules. The rejections of the NF membrane to brilliant blue KN-R, cationic red X-GTL, acid red B, rhodamine B and cationic gold yellow X-GL were 99.9%, 99.8%, 98.8%, 97.5% and 96.7%, respectively.
研究领域:
膜科学
·
纳米技术
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Mengna Cao,Chengzhi Liu,Jieyu Shi,Fangfang Ni,Jiaming Qi,Qing Shen,Min Huang,Gerui Ren,Shiyi Tian,Quanquan Lin,Xiaoxin Lu,Qunfang Lei,Wenjun Fang,Hujun Xie
In this work, the ZEIN-HTCC nanoparticles formed by zein and N-(2-hydroxy)propyl-3-trimethylammonium chitosan chloride (HTCC) were used as stabilizers to prepare oil-in-water (O/W) Pickering emulsions. The preparation conditions including shearing time, volume fraction of corn oil, mass ratio of ZEIN:HTCC and total concentration of ZEIN-HTCC of emulsions were optimized by measuring the droplet size, zeta potential, PDI and surface tension of emulsions. The ZEIN-HTCC emulsions are stable at the pH range of 4–9 and in the low salt ion concentrations up to 0.2 mol L −1 , and can keep stable up to 21 d during low temperature storage. Fourier transform infrared spectroscopy (FTIR), the confocal laser scanning microscope (CLSM) and scanning electron microscopy (SEM) were used to analyze the interaction between emulsion components, revealing that zein and HTCC form a composite layer by flocculation to adsorb on the surface of oil droplets, thus preventing emulsion droplets from aggregation. This novel, long-term stable, surfactant-free, and edible zein-based Pickering emulsion could be used as potential carriers for lipophilic nutrients delivery.
研究领域:
食品科学
·
胶体与界面化学
·
纳米技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）