Recent Patents on Nanotechnology
·
2023
·Vol. 19
·期 3
·453-465
·
IF 2
Muhammad Ali,Ya Li,Ji-Huan He
BackgroundBipolymeric nanofibers have gained significant attention in various fields due to their enhanced functionality, improved mechanical properties, and controlled release capabilities. However, the fabrication of these composite fibers with a well-defined polymer-polymer interface remains a challenging task.MethodsThe double bubble electrospinning setup was developed and simulated using Maxwell 3D to analyze the electric field. PVP and PVA polymers were electrospun simultaneously to create bipolymer nanofibers with an interface. The resulting nanofibers were compared with nanofibers made from pure PVA, PVP, and a PVA/PVP blend. The characterization of the nanofibers was performed using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA).ResultsThe SEM images showed the formation of PVA/PVP interfacial nanofibers aligned side by side, with a diameter of a few thousand nanometers on each side. By increasing the voltage from 20 kV to 40 kV during electrospinning, the diameter of the nanofibers on the PVA and PVP sides was successfully reduced by 60.8% and 66.3%, respectively. FTIR analysis confirmed the presence of both PVA and PVP in the bipolymeric interfacial nanofibers. TGA analysis demonstrated a weight retention of 14.28% compared to PVA, PVP, and the PVA/PVP blend even after degradation at 500°C. The Maxwell simulation of double bubble electrospinning revealed a stronger and more uniform electric field pattern at 40 kV compared to 20 kV.ConclusionThe study has demonstrated the potential of double bubble electrospinning for the fabrication of bipolymer nanofibers with an interface, opening new avenues and patents for the development of functional nanofibers.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Qixin Zhang,Yanyu Chen,Wenyan Liu,Yuanping Ye,Danyun Cheng,Huina Zheng,Leiyan Wu
Parameters such as interfacial tension, dynamics, and rheology are intricately linked to the emulsifying and foaming properties of proteins. In this study, the effects of different Tween types and concentrations on the structure and interfacial characteristics of ovalbumin (OVA) were examined, and their relationships with emulsifying and foaming properties were explored. The results showed that the addition of Tween caused the structure of OVA to become looser and more disordered (β-sheets gradually transformed into β-turns) and exposed more hydrophobic groups. In addition, with the increase in Tween concentration, OVA-Tween systems exhibited lower interfacial tension and could adsorb more rapidly at both the air–water and oil–water interfaces. Additionally, the interfacial elastic modulus of these systems also increased. Compared with natural OVA (EAI = 4.023 m 2 /g, FA = 60.00 %), OVA-Tween showed significantly enhanced emulsifying and foaming abilities. However, higher Tween concentrations (0.1 %) led to competitive adsorption between OVA and Tween, inducing a reduction in the interfacial modulus and a slight decrease in the emulsifying and foaming stability. The emulsifying and foaming performance of the four composite systems were as follows: OVA-Tween 20 > OVA-Tween 40 > OVA-Tween 80 > OVA-Tween 60. Correlation analysis revealed a significant association between the structure and interfacial properties and the emulsifying and foaming performance of OVA-Tween ( p < 0.05). These results demonstrated that Tween can significantly enhance the emulsifying and foaming properties of OVA. The findings provide a theoretical basis for the application of the novel OVA-Tween emulsifier in regulating OVA-based dairy products and baked foods.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small Methods
·
2024
·
IF 10.7
Bin He,Wanting Zhao,Wenjin Li,Chunlei Wei,Jian Sun
The improvement of photocatalytic activity of g-C 3 N 4 is expected for its advanced applications but remains a challenge due to the limitations of current strategies, such as single function, inefficiency, and uneconomical. Herein, a modified g-C 3 N 4 with improved interface properties is constructed through the modulation of the ionic microenvironment affected by ionic liquids (ILs) and exhibits a 2.3-fold enhanced photodegradation efficiency and a 3.5-fold enhanced reaction rate relative to pristine g-C 3 N 4 . It has demonstrated excellent performance in photo-therapy bacterial-infected wounds. Theoretical calculation indicated that the precursor can be regulated by designing the specific ILs microenvironment to form “ILs-Mel” clusters due to the diversity of interaction energy and electrostatic potential. The cluster results in uneven stress on the 2D plane, further inducing the reconstruction of the microstructure. The synergistic effect of cations and anions of ILs on regulating the interface properties of g-C 3 N 4 due to the change of skeleton structure during thermolysis of ILs. The microstructure, surface, and optical-electrical properties can be adjusted by selecting different cations of ILs, and the custom-made band structure and wettability can be obtained by selecting different anions. This work provides a facile strategy to modulate the interface properties of g-C 3 N 4 by building specific a microenvironment of precursor.
研究领域:
材料科学
·
环境科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2022
·Vol. 11
·期 18
·2895
·
IF 5.561
Shuang Han,Fengzhan Cui,David Julian McClements,Xingfeng Xu,Cuicui Ma,Yutang Wang,Xuebo Liu,Fuguo Liu
HighlightsPea protein isolate (PPI) and EGCG spontaneously formed complexes.Protein–polyphenol complexation was mainly driven by hydrogen bonding.The binding of EGCG influenced the structure and functionality of PPI.PPI-EGCG complexes had better emulsifier properties than PPI.AbstractThere is increasing interest in using plant-derived proteins in foods and beverages for environmental, health, and ethical reasons. However, the inherent physicochemical properties and functional performance of many plant proteins limit their widespread application. Here, we prepared pea protein isolate (PPI) dispersions using a combined pH-shift/heat treatment method, and then, prepared PPI-epigallocatechin-3-gallate (EGCG) complexes under neutral conditions. Spectroscopy, calorimetry, molecular docking, and light scattering analysis demonstrated that the molecular complexes formed spontaneously. This was primarily ascribed to hydrogen bonds and van der Waals forces. The complexation of EGCG caused changes in the secondary structure of PPI, including the reduction in the α-helix and increase in the β-sheet and disordered regions. These changes slightly decreased the thermal stability of the protein. With the accretion of EGCG, the hydrophilicity of the complexes increased significantly, which improved the functional attributes of the protein. Optimization of the PPI-to-EGCG ratio led to the complexes having better foaming and emulsifying properties than the protein alone. This study could broaden the utilization of pea proteins as functional ingredients in foods. Moreover, protein–polyphenol complexes can be used as multifunctional ingredients, such as antioxidants or nutraceutical emulsifiers.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yue Wei,Yanping Xie,Zhixiang Cai,Yalong Guo,Min Wu,Pengguang Wang,Ruiqi Li,Hongbin Zhang
Hypothesis The structural modification of natural emulsifiers may greatly impact their interfacial behaviours and bulk properties. The relationship between the microscopic interfacial viscoelasticity and the macroscopic emulsion stability in emulsifiers with different degrees of modification can be clarified using a multiscale approach. Experiments A polysaccharide emulsifier of corn fibre gum (CFG) with different octenyl succinate anhydride (OSA) contents was used to obtain a broad variety of interfacial properties . Interfacial adsorption kinetics and viscoelastic responses were measured by combining interfacial shear rheology and quartz crystal microbalance with dissipation monitoring, and the emulsion properties (droplet size and physical stability) at other scales were evaluated. Findings Compared with native CFG, esterified CFG formed thick interfacial films with higher elasticity and viscosity , and their corresponding emulsions showed greater stability. There exists a satisfactory correlation between interfacial rheological properties and emulsion stability. However, such a satisfactory correlation can not be established among the degree of esterification of CFG, interfacial viscoelasticity and stability since depletion flocculation might occur in the emulsion stabilized by the OSA-CFG with the highest OSA content, which induced inferior bulk stability but exerted no impact on the measured interfacial properties. We propose that the depletion flocculation is responsible for this imperfection and provide detailed explanations.
研究领域:
食品科学
·
胶体化学
·
表面化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiu-ning Yao,Rui-ling Dong,Yu-cong Li,Ao-jing Lv,Li-ting Zeng,Xue-qing Li,Zhou Lin,Jun Qi,Chun-hui Zhang,Guo-yuan Xiong,Qing-yong Zhang
The effects of pH-shifting treatments (pH 3, 5, 7, 9, and 11) on the stability of gelatin emulsions made by low-energy stirring were investigated. pH-shifting treatments significantly enhanced the ESI and EAI of the emulsion ( P < 0.05) and reduced its particle size ( P < 0.05) under low-energy emulsifying conditions. The pH 11 – 7 shifting treatment significantly increased the degree of depolymerization and the level of ordered structure of gelatin ( P < 0.05). These transformations resulted in a significant increase in the exposure of hydrophobic and negatively charged residues ( P < 0.05) on the surface of gelatin, facilitating a faster adsorption rate of gelatin onto the oil-water interface as well as an increase in the amount of gelatin adsorbed at the interface. Moreover, the alkali-shifting treatment promoted the formation of a thin viscoelastic interfacial film, which contributed to the enhanced stability of the emulsion.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Yuan Fang,Aoxuan Wang,Keze He,Hongying Pan,Jiajun Liao,Zhu Ding,Feng Xing,Huirong Le,Xianfeng Wang
This article investigates the key interface properties of geopolymers reinforced by SiC whiskers loaded with BN coating (BN/SiCw) and the insight of mechanical performance and microstructures of the resulting composites. The interesting diverse strength evolutions of geopolymer composites calcinated at various temperatures suggest a result of rivalries of multiple factors including BN coating, geopolymer matrix transformations, SiC whiskers. A positive effect on whisker pull-out phenomenon has been achieved via the chemical bonding between SiC whisker (SiCw) and BN coating and the rough physical interface between BN coating and geopolymers; the addition of SiCw and BN/SiCw promotes the polycondensation reaction of geopolymers and the addition of the latter is superior. Through changing the pore structure characteristics of the composites, the SiCw in composites can release their excessive vapor pressure in the closed pores which is the main reason attributing to the strength loss of geopolymers at 900 °C. In addition, BN coating can make up for the mismatch of thermal expansion coefficient between SiCw and geopolymers, increasing the strength of the composites by 30.9% at 900 °C, whereas whisker pull-out and crack deflection are the main toughening effect for BN/SiCw.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2022
·Vol. 57
·期 8
·5228-5238
·
IF 3.612
Shuya Wang,Bin Zhou,Xinquan Yang,Liqiong Niu,Shugang Li
Summary Clanis Bilineata Tingtauica Mell Protein (CBTMP) was one of the new natural insect protein resources. However, due to its strong surface hydrophobicity and poor emulsion stability, its application has greatly been limited. In this study, Pickering emulsions were prepared by CBTMP–Tannic acid (CBTMP–TA) particles and soybean oil ( φ = 50%). The presence of TA significantly increased the zeta-potential (from −23.5 ± 0.73 to −29.23 ± 0.58 mV) and three-phase contact angle (from 129.9 ± 4.53° to 87.27 ± 3.20°) of complex, especially the concentration of TA was 0.4 m m . Besides, the stability of emulsions was significantly improved according to the results of the droplet size and static multiple light scattering. Furthermore, rheological properties including viscosity, thixotropy and creep recovery were significantly enhanced, which indicated the formation of a more stable network structure. Interfacial behaviour (Interfacial tension, interfacial film viscoelasticity and diffusion rate) of emulsions was significantly changed, forming a more stable interfacial layer as TA content increased. The CBTMP–TA complex was adsorbed at the interface and the adsorption rate was also mainly affected by the content of TA. The study indicated CBTMP–TA compositions to enhance stability, rheological behaviours and interfacial characteristics, and demonstrated the potential applications of insect protein resources in food emulsion systems.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 6
·681
·
IF 3.52
Qian Zhang,Yiwen Jiang,Jingheng Gao,Mingli Fu,Sibei Zou,Yanxia Li,Daiqi Ye
A series of CeO2–MnOXcatalysts with different Ce contents was prepared using Mn–BTC MOF as a sacrificial template for toluene oxidation. Interestingly, the performance of CeO2–MnOXincreased rapidly only when the Ce content lower than 5%. The 1%-, 3%- and 10%-Ce-content samples exhibited the T90value of 325 °C, 291 °C and 277 °C, respectively. XRD shows that the catalyst phase changes significantly before (Mn3O4only) and after (Mn2O3, Mn3O4and CeO2) 3% Ce loading. All other results indicated that the Ce–Mn interface properties of different Ce content composite oxides was quite distinguishable in terms of removal and energy efficiency. XRD and XPS results further showed that there a Ce monolayer dispersion threshold existed on the interface of MnOX(3.2 wt%, confirmed by XPS), which caused the difference in performance increment. The dispersed Ce could be divided into a monolayer dispersion state (1–3%) and a crystalline phase state (>3%), according to the existence form, which corresponded to the significant and minor enhancements of toluene conversion rate. Importantly, the Ce in monolayer dispersion state obviously improved the redox properties of catalysts interface, while the Ce in crystal state not. The interfaces with monolayer dispersion Ce result in more abundant metal ion states, oxygen vacancies, better electron transfer performance and catalytic activity.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Junkan Yue,Xizhi Chen,Man Chen,Zirui Wang,He Zhang,Shaochuan Luo,Hongwei Bai,Runlai Li,Qiang Fu
This study explores the underlying mechanisms of polar/nonpolar adsorption dynamics utilizing ultrathin polyethylene (PE) membranes, presenting an innovative method to directly characterize interfacial phenomena. By modifying the surface of these membranes with trace amounts of poly (acrylic acid) (PAA), we probe the entropy-driven hydrophobic and depletion interactions that dominate the adsorption process. This encapsulation significantly alters the hydrophilicity of PE—from a contact angle of 132.2° to 37.0°—while maintaining the micro-structural integrity at remarkably low PAA loadings. For the first time, this approach allows for the isolation and direct characterization of the interface through methods such as weighing, thermal cycling, and tensile testing. Key findings demonstrate that the adsorbed PAA layer is exceptionally loosely packed, exhibiting a porosity exceeding 90 %. Moreover, the presence of PAA differentially impacts the crystallization behavior of FCC and ECC within PE, hindering FCC crystallization significantly while mildly affecting ECC. Post-adsorption, the modified PE membrane exhibits smart separation capabilities: it behaves amphiphilically in air, allowing simultaneous permeation of water and oil, and selectively separates water/oil mixtures in liquid environments based on the pre-wetting phase. The resulting hydrophilic ultrathin PAA-PE membranes maintain high transparency (over 90 %), robust mechanical strength (309 MPa in tensile maximum stress), and substantial porosity, all within a freestanding, 340 nm-thick form. This work not only elucidates several first-time observations of the intriguing polar/nonpolar adsorption interface but also provides new approaches for thorough and stable physical modification to polymer membranes.
研究领域:
材料科学
·
表面化学
·
高分子物理
✓ 已验证
产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2018
·
IF 6.036
Xin Liang,Lei Shen
Grain boundary plays an important role in energy carrier transport. By choosing ZnO as a model system of technological importance, and by measuring the thermal and electrical transport properties of ZnO polycrystals with a wide range of grain boundary spacing, we determine the interfacial thermal (Kapitza) resistance of the ZnO grain boundary R k = 4.0 ± 0.7 × 10 − 9 m 2 K W −1 , which is relatively independent of grain size . The effective electron potential barrier height and the depletion width of the grain boundary generally increase with spacing, but they collapse below ∼100 nm and become almost invariant above ∼1 μm. When the grain boundary is locally modified by nanometer-thick ZnS thin film , the Kapitza resistance increases by more than three times, up to about 12.9 × 10 − 9 m 2 K W −1 , and the depletion region expands more than twice. The charge carrier concentration is influenced by the effective potential barrier height due to the grain boundary energy filtering effect whereas the electron mobility is related to the depletion width. Our investigations demonstrate the significance of grain boundary characteristics for interfacial and effective bulk transport properties. The findings and the approach are broadly important for polycrystalline materials of which the functional performance can be adjusted via grain boundary engineering.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Xinze Yang,Weihua Pei,Chunrong Wei,Xiaowei Yang,Huiling Zhang,Yang Wang,Miao Yuan,Qiang Gui,Yuanyuan Liu,Yijun Wang,Hongda Chen
Poly(3,4-ethylenedioxythiophene) (PEDOT) is an organic material with good electrochemical activity and electrical conductivity , and it is usually electrochemically deposited on the neural probes to improve their interface properties . However, the workload for electrode modification using an electropolymerization method becomes greater with the increase in the number of electrode channels. Moreover, the integration of electrodes and amplification circuits makes electropolymerization difficult to implement. In this study, a chemical polymerization method was proposed to produce conducting polymer PEDOT on the electrode sites. Compared with electropolymerization, it does not require each electrode site to be connected to a power source. It is competitive in batch preparation and is particularly suitable for neural microelectrodes prepared by a micro-electromechanical systems (MEMS) process. The charge storage capacity, impedance, mechanical stability , and electrochemical stability of conducting polymer PEDOT prepared by the proposed method are evaluated. The results indicate that the method is feasible for batch modification of the microelectrodes, and it is also suitable in cases where energization is inconvenient.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）