FOOD CONTROL
·
2013
·
IF 2.738
Chen Huang,Jie Zhu,Ling Chen,Lin Li,Xiaoxi Li
The effect of microwave treatment on the plasticizer migration and the changes in multi-scale structures of starch ester films for food packaging were evaluated, and the relationship between these structural changes and plasticizer migration was revealed. The plasticizer migration from the starch ester film to the milk system was accelerated during microwave heating compared with during simple immersion at 30 °C without microwave. After microwave heating, the water and/or fat molecules of the milk system rapidly permeated the film interface to enlarge the interchain spaces. The plasticizer molecules distributed near the boundary more readily migrated out than those located in the matrix interior. The changes in the plasticizer/starch ester interaction and film structures weakened the stability of the ether bond both in the plasticizer and starch ester molecules. The crystalline structure of the film was changed with a certain degree of destruction and the relevant interplanar spacing was decreased. The milk permeation into the amorphous region of the film impeded the shrinkage and aggregation of amorphous starch ester chains and even enlarged the inter-chain distances in this region. However, the ordered microaggregations were shrunk with reduced polydisperse size distribution. In consequence, the aggregation structure showed less restriction to the activated plasticizer molecules as a result of microwave treatment. These structural changes, including the expanded amorphous region and shrunk ordered microregions, could be the reason for the greater plasticizer migration during the microwave treatment. This knowledge will help us in further designing the starch-based materials with restrained plasticizer migration by controlling the molecular interaction, crystalline structure and ordered aggregation structure within the film matrix for safe and reasonable application of this type of packaging materials.
研究领域:
食品科学
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 7
·3025-3037
·
IF 4.5
Zhang Kai,Sun Yinjie,Hou Sifan,Li Guoqi,Fan Jinpeng
Multi-scale BN/SiC ceramic with high toughness was successfully prepared by vacuum-assisted filtration. The BN/SiC ceramic bulk is composed of macroscopic laminated structure and microscopic brick–mortar structures in layer. In this ceramic, improving toughness relies on the design of multi-scale structure. The ordered arrangement of BN sheets and SiC form a ceramic layer with a structure similar to brick and mortar. At the same time, the SiC layer and BN/SiC layer are alternately arranged by layer-by-layer deposition method to form the macro-layer structure. The thickness of SiC layer and BN/SiC layer is only about 74 μm and 7.6 μm, respectively. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN/SiC layer. The delamination cracks occurred inside the BN/SiC layer or at the interface between SiC and BN/SiC layers. The BN/SiC laminated ceramic possesses high toughness (9.37 MPa m 1/2 ) when the BN content is 20wt.%, which is much higher than that of pure SiC bulk (3.45 MPa·m 1/2 ).
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CEREAL SCIENCE
·
2025
·
IF 3.7
Zhuojia Lv,Cuiping Han,Xue Yang,Junfang Zhang,Yujie Duan,Qingxin Guo,Jianjun Cheng
The effects of chickpea protein hydrolysates (CPH) with different hydrolysis times (30 min, 60 min, and 120 min) and different amounts (5%, 10%, and 20%) on the multi-scale structure and digestibility of rice starch (RS) were investigated. The addition of CPH did not change the recrystallization of rice starch compared to pure rice starch. The addition of CPH increased the pasting temperature of starch, decreased the enthalpy of pasting, and effectively inhibited the pasting of starch. In vitro digestion results showed that the interaction between CPH and rice starch significantly reduced the digestibility of rice starch. The content of rapidly digestible starch in the RS-10% CPH120 complex decreased from 50.41% to 40.56%. However, the addition of 20% CPH hydrolyzed for 120 min may inhibit the non-covalent interaction between RS and CPH due to the aggregation of more short peptides. The RDS content in the complex RS-20% CPH120 (41.98%) was higher than that of RS-10% CPH120 (40.56%). In conclusion, our work demonstrates for the first time that CPH has a significant inhibitory effect on starch digestion.
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
Energy Storage Materials
·
2019
·
IF 0
Chang Chen,Dan Cheng,Shoujie Liu,Zhe Wang,Mingzhen Hu,Kebin Zhou
Rechargeable zinc-air batteries (ZABs) are attracting enormous attention owing to their low cost and high theoretical energy density . However, their practical applications are impeded by the low lifetimes and inferior energy conversion efficiency as a result of poor catalyst stability and sluggish oxygen reaction kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at their air cathode. Herein, a multiscale structural engineering of the novel catalyst of Fe/Co single atoms co-doped graphite nanoarrays mounted on carbon microspheres (FeCo(a)-ACM) is reported towards ORR and OER for ZABs. In micro-scale, 3D hierarchically porous carbon microspheres facilitate the mass and electron transport ; in nano-scale, ordered graphite nanoarrays increase the accessible chances of the active sites; in atomic-scale, chemical doping of Fe/Co single atoms boost the intrinsic ORR and OER activity and finally enhance the performance of ZABs. The FeCo(a)-ACM exhibits excellent ORR (onset potential: 1.03 V, half-wave potential: 0.90 V) and OER (1.60 V at 10 mA cm −2 ) activity. In a practical demonstration, a low charge-discharge gap and a record rechargeable lifetime lasting 900 h at 10 mA cm −2 are achieved by zinc-air battery with FeCo(a)-ACM within the air electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Materials Chemistry Frontiers
·
2016
·Vol. 1
·期 3
·468-476
·
IF 0
Bin Wang,Xiao-Ying Lu,King Yan Wong,Yuanyuan Tang
In this study, Co3O4 nanoflowers (Co3O4-NFs) have been successfully synthesized by a facile ammonia-assisted solvothermal process and subsequent heat treatment. By suitably increasing ammonia solution added during solvothermal synthesis, flower-like Co3O4 structures were tailored from nanoflowers to microflowers (Co3O4-MFs). Materials characterization indicated that Co3O4-NFs with a specific surface area as high as 103.9 m2 g−1 were composed of multi-scale dimensions, including nanoparticles (0D) of about 10 nm in size, nanosheets (2D) of about 10 nm in thickness and nanoflowers (3D) of 290 ± 25 nm in diameter. The unique structural characteristics were beneficial for fast lithium ion diffusion and efficient electron transport. In addition, the mesoporous structure (22.6 nm) and the large pore volume (0.587 cm3 g−1) of Co3O4-NFs were favorable for effectively alleviating volume expansion problems of high-capacity anode materials during charge–discharge cycles. When Co3O4-NFs were investigated as anode materials for lithium ion batteries, superior lithium storage capability, excellent cycling stability and C-rate performance were achieved, in comparison with Co3O4-MFs and commercial Co3O4 micro-/nanoparticles (Co3O4-NPs). Specifically, when tested at a current density of 500 mA g−1 for 100 cycles, the reversible specific capacity of 1323 mA h g−1 was achieved for Co3O4-NFs, much higher than Co3O4-MFs (1281 mA h g−1) and Co3O4-NPs (107 mA h g−1). When current densities of C-rate tests were increased to 1000, 2000 and 3000 mA g−1, Co3O4-NFs could still deliver average specific capacities of around 1081, 925.9 and 570.8 mA h g−1, respectively. Owing to the intriguing merits from the unique characteristics, Co3O4-NFs with a nanoflower structure could achieve remarkable lithium storage capability, demonstrating great potential in next-generation lithium ion batteries.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
✓ 已验证
DOI
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Haibo Huang,Yun Wang,Chen Zou,Jiawei Tao,Dan Qu,Xiaoting Ma,Ping Liu,Yizao Wan,Yan Xu
Hierarchical structuration has proven to be effective in optimizing the functional performance of nanomaterials. Herein, we report for the first time the evolution of a titania tube-in-tube scaffolding architecture with multilength-scale structural hierarchy (TITS TiO2) and structure-enhanced functional performance. The nanoengineering was accomplished by a precursor scaffolding-concurrent epitaxial growth approach using bacterial cellulose (BC) as a bioscaffold. The BC@SiO2@TiO2 precursor scaffold with a sandwiching SiO2 layer plays an essential role in the formation of the tube-in-tube geometry. TITS TiO2 exhibits significantly superior photocatalytic activity to Degussa P25. It shows great UV light absorption ability and high specific surface area, which we believe are responsible for its superior photocatalytic activity. The monolithic nature of TITS TiO2 makes photocatalyst separation and recovery possible. We show that TiO2 nanocrystals can be used as a building block for the organization of complex inorganic nanomaterials with multilength-scale structural hierarchy using a bioscaffold with desired structural features: monolith (millimeter and above), macropore (micrometer), and nanotube/nanopore (nanometer), offering a versatile route for the design of advanced hierarchical nanomaterials.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Benfeng Zhu,Jiao Liu,Yu Chen,Yuanwei Liu,Zhongnian Yang,Zhao Zhang
To obtain a superhydrophobic surface with hierarchical micro/nanostructures, two kinds of SiO 2 nanoparticles with different sizes were embedded into crosslinked silanized polyacrylate (CPSA). The silanized polyacrylate (PSA) was first synthesized via free radical copolymerization of acrylate monomers and vinyltrimethoxysilane (VTMS). Then, the silicone methoxyls of the VTMS units were subsequently crosslinked by a condensation reaction with hydroxy terminated polydimethylsiloxane (HTPDMS) to form CPSA. The structure of PSA and CPSA were characterized by Fourier transform infrared spectroscopy . The surface wetting property, surface morphology , mechanical robustness and anticorrosion performance of the CPSA/SiO 2 coatings were systematically studied. The results demonstrated that the obtained coatings could be expediently sprayed onto substrates to create a water-repellent surface, and possessed good mechanical robustness and high corrosion resistance against NaCl solutions.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shaoyu Zhang,Qian Long,Geyuan Jiang,Xin Li,Jianhong Zhou,Lupeng Shao,Suqing Zeng,Dawei Zhao
Given the escalating environmental and safety concerns, friendly protective materials with exceptional mechanical properties, biodegradability, and insensitivity to high temperature have received more and more attention. Here, we report a robust cellulosic gel through the multi-scale integration of cellulose molecular skeleton, nano-reinforced diatomite, and in situ polymerized polyacrylamide molecule. The bottom-up yet cross-scale approach facilitates the formation of cellulosic gel characterized by a highly interconnected hydrogen bond network and nano-enhanced domain, resulting in a tensile strength of up to 13.83 MPa, a Young's modulus exceeding 280 MPa, and an impact strength around 12.38 KJ m −1 . Furthermore, this gel exhibits structural stability at temperatures up to 130 °C, good flame retardancy, and complete biodegradability within a span of 35 days. The robust cellulosic gel, acting as a pliable protector, demonstrates exceptional protection for human joints. Our study presents a highly efficient and scalable pathway towards the development of sustainable and robust biomass gels, holding immense potential in intelligent-protective wearables and advanced materials science and engineering.
研究领域:
材料科学
·
环境科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2020
·
IF 4.972
Hai He,Bo Zheng,Hongwei Wang,Xiaoxi Li,Ling Chen
The study presents an innovative approach using heat-moisture treatment (HMT) to prepare rice starch-oleic acid (OA)/linoleic acid (LOA) complex. Relationship of the multi-scale structure- in vitro digestibility of rice starch-OA/LOA complex induced by HMT was established in this work. Herein, HMT induced the formation of single helices complex between OA/LOA and amylose or long side chains of amylopectin, which formed more V-type crystallite. HMT assisted complexation with OA/LOA resulted in higher ordered molecular chain aggregations in amorphous amylose background area, reduced the amorphous lamellae and made the double helices and A-type crystallite perfectly arranged. These structural alternations inhibited the molecular interactions (e.g., binding ability, catalyzed location) between rice starch and α-amylase, which eventually increased the resistant starch (RS) content and decreased the slow digestible starch (SDS) content. Moreover, HMT treated rice starch formed type II complex with OA and type I complex with LOA, and all the referred changes went more obvious with the increasing amount of OA than LOA. The results suggested that the OA/LOA was inserted inside the amylose spiral cavity and the amorphous lamellae of rice starch. The current study exhibited an in-depth research of the multi-scale structure within rice starch-OA/LOA complex and proposes a promising approach to ensure the starch products have designated digestibility.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xinyue Liu,Wei Liang,Jiayu Zheng,Wenqing Zhao,Huishan Shen,Xiangzhen Ge,Jie Zeng,Haiyan Gao,Yayun Hu,Wenhao Li
To investigate the effect of electron beam irradiation (EBI) pretreatment on the multiscale structure and physicochemical properties of esterified starch, this study used EBI pretreatment to prepare glutaric anhydride (GA) esterified proso millet starch. GA starch did not show the corresponding distinct thermodynamics peaks. However, it had a high pasting viscosity and transparency (57.46–74.25 %). EBI pretreatment increased the degree of glutaric acid esterification (0.0284–0.0560) and changed its structure and physicochemical properties. EBI pretreatment disrupted its short-range ordering structure, reducing the crystallinity, molecular weight and pasting viscosity of glutaric acid esterified starch. Moreover, it produced more short chains and increased the transparency (84.28–93.11 %) of glutaric acid esterified starch. This study could offer a rationale for using EBI pretreatment technology to maximize the functional properties of GA modified starch and enlarge its implementation in modified starch.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2018
·
IF 3.412
Siyuan Liu,Xiaoxi Li,Ling Chen,Lin Li,Bing Li,Jie Zhu
In order to control d-limonene permeability, cellulose nanocrystals (CNC) were used to regulate starch-based film multiscale structures. The effect of sphere-like cellulose nanocrystal (CS) and rod-like cellulose nanocrystal (CR) on starch molecular interaction, short-range molecular conformation, crystalline structure, and micro-ordered aggregated region structure were systematically discussed. CNC aspect ratio and content were proved to be independent variables to control d-limonene permeability via film-structure regulation. New hydrogen bonding formation and increased hydroxypropyl starch (HPS) relative crystallinity could be the reason for the lower d-limonene permeability compared with tortuous path model approximation. More hydrogen bonding formation, higher HPS relative crystallinity and larger size of micro-ordered aggregated region in CS0.5 and CR2 could explain the lower d-limonene permeability than CS2 and CR0.5, respectively. This study provided new insight for the control of the flavor release from starch-based films, which favored its application in biodegradable food packaging and flavor encapsulation.
研究领域:
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LAB ON A CHIP
·
2019
·Vol. 19
·期 11
·1953-1960
·
IF 6.914
Jingmei Li,Tiantian Kong,Jiazuo Yu,Kit Hang Lee,Yuk Heng Tang,Ka-Wai Kwok,Ji Tae Kim,Ho Cheung Shum
The rope coiling observed in liquid ink with high viscosity has been exploited in additive printing to fabricate architectures with periodically curled structures and tune their mechanical properties. However, the control over the coiling path relying on mechanical motion restricts the spatiotemporal resolution. We develop an electrically assisted high-resolution technique to manipulate coiling paths of viscous ink and structures of the deposited filament. By spatially programming the voltage applied onto the viscous ink, we show that the switching between different filament structures can be accomplished at single wavelength resolution, facilitating the rapid and accurate construction of sophisticated patterns. Furthermore, translational guiding of the electrocoiling enables rapid printing of filaments with complex structures at a line speed of 102 mm s−1. With a simplified trajectory of the printing head, large-area and multiscale patterns can be printed at an unprecedented speed; for instance, centimeter-sized architectures constructed from nanofibers with micron-sized curled structures can be completed in a few minutes. By enabling the printing of complex fiber networks with tunable shape and density, our work provides a route towards custom-design of fiber architectures with unique features such as spatially varying mechanical properties.
研究领域:
材料科学
·
制造工程
·
纳米技术
✓ 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）