COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
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IF 2.76
Shunjian Xu,Can Liu,Feng Ye,Yajie Guo,Jörg Wiezorek
Carbon microspheres with nanoporous structures were synthesized based on hydrothermal reaction of saccharide solutions in the presence of potassium hydroxide. The influence of synthesis conditions, including types of saccharide, content of alkali, concentration and reaction time of saccharide solution, on the morphology of the microspheres was systematically investigated, with emphasis on controlling the microsphere size and understanding the role of alkali in hydrothermal reaction. The results show that the microspheres with regular spherical shapes and high surface areas around 500 m 2 g −1 are obtained. The morphology of the microspheres can be tailored by changing the synthesis conditions. The mean diameter of the microspheres varies from 0.16 to 5.61 μm. At different stages of the hydrothermal reaction of starch solution, alkali exhibits entirely different effects: (i) to slow the initial hydrolysis of starch, and (ii) to accelerate the subsequent polymerization of dehydrated and fragmented products and the growth of the microspheres. As a result, the competition between the hydrolysis kinetics and the polymerization and growth kinetics plays a critical role in the changes of the morphology and yield of the microspheres. The alkali in dilute starch solution (0.073–0.219 M) promotes the increase of the size and yield of the microspheres. In contrast, the alkali in concentrated starch solution (0.292 M) results in the reduction and the more uniform distribution of the size of the microspheres with almost constant yield. Note that this alkali assisted hydrothermal route can endow the microspheres with more surface functional groups, including hydroxyl and carboxyl groups, compared with the typical hydrothermal route without alkali. In addition, the formation of the stacks of graphene sheets and the decrease of functional groups occur in the microspheres during pyrolysis, which are accompanied by a significant weight loss of about 50% and a slight contraction in scale.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Current Research in Food Science
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2023
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IF 6.3
Ningxiang Yu,Yijue Wang,Shengxin Shao,Jie Li,Mengren Li,Lizhong Zhu,Qin Ye,Weiwei Huan,Xianghe Meng
To explore the effect and its mechanism of alkali-assisted phosphorylation on the functional properties of Camellia Oleifera seeds cake glutelin (CSCG), CSCG was treated with different concentration of sodium trimetaphosphate (STMP, 1.0, 2.0, 3.0, 4.0, and 5%, w/v) in different pH environment (3.0, 5.0, 7.0, 9.0, and 11.0). The results showed that alkali assist improved the phosphorylation degree of CSCG, and the optimum pH value is 9.0. FT-IR and XPS confirmed the successful modification of phosphate groups on CSCG through covalent interaction. Alkali-assisted phosphorylation decreased the particle size and increased electronegativity of CSCG, as well as changed in its surface hydrophobicity, crystallinity, and intrinsic fluorescence. All these changes of protein structure triggered by alkali-assisted phosphorylation led to the improvement of water solubility, water/oil absorption capacity, emulsifying ability, foamability, and in vitro digestibility of CSCG. This work could provide a theoretical basis for industrial production of CSCG with excellent functional properties.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Hailin Zhang,Tingting Zhou,Xiangyu Li,Wenbiao Xu,Junyou Shi
With the growing global energy demand due to population expansion and industrial development, the efficient valorization of plant resources is critical for achieving carbon neutrality and carbon conversion. While significant progress has been made in the comprehensive utilization of lignocellulosic biomass through various novel pre-treatment methods, using lignocellulosic materials as raw materials to separate lipids while separating the three main components, especially from lipid-rich coniferous trees, still faces many challenges. This article presents a novel pre-treatment approach using alkali-assisted deep eutectic solvents (DES) in combination with the tall oil production process derived from sulfite pulping by-products, focusing on the production of tall oil and lignin components from black liquor. The results indicate that the optimal acidification conditions are a pH of 6 and a reaction time of 120 min at high temperature, yielding the best crude tall oil with linoleic acid at 79.9%, isoabietic acid at 28.5%, and dehydroabietic acid at 32.3%. Under weak acidic conditions, some lignin is affected by high temperatures, leading to the formation of small lignin fragments. However, under the protection of deep eutectic solvents (DES), a large amount of β-O-4 bonds is still preserved, which is beneficial for subsequent degradation. This newly designed pre-treatment process for biomass raw materials offers valuable guidance for achieving efficient green defatting and separation of the three main components of lignocellulosic materials.
研究领域:
生物化学
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林业工程
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可再生资源
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Yiheng Song,Linxu Dong,Jiangkai Bao,Yang Hu,Ru Song,Zhuqun Shi,Quanling Yang,Chuanxi Xiong
The preparation of high-performance heteroatom-doped fluorescent carbon dots (CDs) from renewable biomass or biometabolites hold an extensive attention. Here, we report an excess sodium hydroxide (NaOH) assisted method for the preparation of sulfur-doped carbon dots (S-CDs) at lower temperatures by using thioctic acid (TA). Excessive NaOH can promote the thermal decomposition process of thioctic acid in the hydrothermal process, thereby realizing rapid reaction rate (critical time 1 h) and scalable synthesis at low temperature (120 °C). The amount of NaOH and the reaction time were identified as the main factors affecting the synthesis, and the reaction of NaOH with disulfide bonds contributed the most to the generation of fluorescent S-CDs. This in-situ sulfur doping process resulted in excellent fluorescence properties, high relative quantum yield of 11.5%, low biotoxicity, good biocompatibility and excellent solubility, etc . In addition, this as-prepared fluorescent S-CDs showed excellent concentration dependence on ferric ions (Fe 3+ ) and can achieve high-precision and selective detection. This work may provide a high-efficiency synthesis strategy for S-CDs for biological and detection applications.
研究领域:
材料科学
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生物医学工程
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分析化学
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产品关联
DOI
高影响因子
CATALYSIS TODAY
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2021
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IF 6.766
Qilu Yao,Jianjun Long,Kangkang Yang,Xiugang Li,Bin Huang,Xiangshu Chen,Zhang-Hui Lu
Designing highly active and selective metal nanocatalysts for use in liquid chemical hydrides is highly attractive but remains a critical challenge. Herein, bimetallic NiPt nanoparticles (NPs) immobilized on lanthanum oxycarbonate (NiPt/La 2 O 2 CO 3 ) have been facilely synthesized via an alkali-assisted reduction method. The introduction of NaOH is the key factor to the formation of the well-dispersed and ultrafine NiPt NPs (2.8 nm). The obtained Ni 0.6 Pt 0.4 /La 2 O 2 CO 3 exhibits an extraordinarily high catalytic activity and 100% H 2 selectivity for hydrous hydrazine dehydrogenation , providing a turnover frequency value (TOF) high up to 490 h −1 at 298 K. Additionally, the NiPt/La 2 O 2 CO 3 prepared with NaOH demonstrates higher catalytic performance and lower activation energy than that of NiPt/La 2 O 2 CO 3 _N prepared without NaOH. Moreover, the NiPt/La 2 O 2 CO 3 also shows an outstanding catalytic efficiency (TOF = 1200 h −1 ) for dehydrogenation of hydrazine borane at 298 K. The efficient catalytic performance may be attributed to the small size effect, the strong metal-support interaction, and the NaOH promotion effect. This alkali-assisted reduction method provides a new perspective for preparing of highly efficient catalysts in clean energy application.
研究领域:
材料科学
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催化化学
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清洁能源
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Xiaoqing Du,Yufan Zhou,Qiqi Zhou,Qi Chen,Qidi Zhang,Wangjie Xu,Yulin Zhan,Man Jiang
The efficient and structure-protective isolation of the main components of lignocellulosic biomass remains challenging for value-added utilization. In this study, we used corn straw waste, a vast yet underexplored biomass from agricultural residues, as the raw material to extract high-purity cellulose nanosheets and recycle the lignin components as well-defined lignin nanotubes (LNTs) in a tandem process. The process consisted of a feasible dilute alkali-assisted wet ball milling treatment of steam-exploded corn straw into high-purity cellulose nanosheets and a lignin solution, which was further transferred into LNTs by a molecular assembly method. Purity, morphology, chemical structure, and thermal behavior of high-purity cellulose nanosheets and LNTs were examined. The 98.9 wt% purity of the high-purity cellulose nanosheets was achieved with a crystallinity of 36.9 %, providing a solid foundation for further chemical modification. The LNTs exhibited remarkable antioxidant activity, opening new avenues for the development of lignin-based functional materials and fundamental research.
研究领域:
材料科学
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生物质化学
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纳米技术
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产品关联
DOI
高影响因子
Gels
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2025
·Vol. 11
·期 8
·631
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IF 5.3
Yuxi Wang,Yong Yu,Shuhan Hu,Jinyao Yu,Yue Huang,Hongjie Dai
Pineapple peel cellulose nanofibrils (PCNFs) were facilely prepared by the ball milling method assisted by alkali solution (3 wt% NaOH) and a wet grinding medium, using various treated pineapple peels (hot water treatment (WT), bleaching treatment (BT), alkaline treatment (AT), and baleaching–alkaline treatment (ABT)) as raw materials. The structure of the obtained PCNFs (i.e., WT-PCNF, BT-PCNF, AT-PCNF, and ABT-PCNF) was characterized to analyze the influence of component intervention. The results indicated that NaOH-assisted ball milling did not change the crystal structure of cellulose, and the yield and thermal stability of the PCNFs was improved. The average diameters of WT-PCNF, BT-PCNF, AT-PCNF, and ABT-PCNF were 24.16, 21.53, 23.04, and 19.46 nm, respectively, in which BT-PCNF and ABT-PCNF exhibited a higher defibrillating degree and smaller diameter. Particularly, NaOH-assisted ball milling can promote the removal of non-cellulose components. The viscosity and modulus of BT-PCNF were relatively higher due to the presence of residual hemicellulose as a natural linker of fibers. The current research provides insights for simplifying the preparation and functionalization of nanocellulose.
研究领域:
材料科学
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纳米技术
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生物高分子工程
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可持续材料
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废物资源化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Diandian Huang,Lingyuan Wang,Keting Li,Lingyi Liu,Xingyi Chen,Laping He,Lei Wang,Angxin Song
Curcumin is a natural lipophilic polyphenol that exhibits significant various biological properties such as antioxidant and anti-inflammatory properties following oral administration. However, its uses have shown limitations concerning aqueous solubility, bioavailability and biodegradability that could be improved by prolamin-based nanoparticle. In this study, curcumin was encapsulated into prolamin from sorghum (SOP) and wheat (WHP) and distilled spirit spent grain (DSSGP), which was obtained after microbial proteolysis of the former two cereal grains. All the three prolamins showed clear variation of protein profiles and microstructure as confirmed by electrophoresis analysis, disulfide bond determination and Fourier-transform infrared spectroscopy (FTIR). For curcumin-loaded nanospheres (NPs) fabrication, three prolamin-based NPs shared features of spherical shape, uniform particle size, and smooth surface. The average size ranged from 122 to 193 nm depending on the prolamin variety and curcumin loading. In the experiments in vitro, curcumin showed significantly improved UV/thermal stability. Furthermore, DSSGP was more resistant to enzymatic digestion in vitro, hence achieving the controlled release of curcumin in gastrointestinal tract. Collectively, the results indicated the improved bioavailability and biodegradability of curcumin encapsulated by DSSGP, which would be an innovative potential encapsulant for effective protection and targeted delivery of hydrophobic compounds.
研究领域:
食品科学
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生物技术
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药学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Chen Wang,Haobo Yan,Songlin Li,Yuesen Shi,Mingluo Du,Pengfei Cheng
Morphology-engineered ternary metal oxides have gained increasing attention for their potential in precise and sensitive gas detection. In this work, different Zn₂SnO₄ (ZTO) nanostructures were synthesized via a simple alkali-assisted hydrothermal route. The ZTO microcrystals with a polyhedral shape exhibited the largest specific surface area and content of surface-active oxygen species than cubic and plate-like counterparts. Additionally, the gas sensor based on the ZTO-polyhedron demonstrated outstanding n-butanol sensitivity, along with rapid response and recovery times, good repeatability and long-term stability. Furthermore, density functional theory (DFT) simulations were conducted to investigate the adsorption behavior of n-butanol on different crystallographic facets of ZTO to further elucidate the mechanism of ZTO-Polyhedron for the enhanced performance toward n-butanol. The results highlight the significant potential of this type of sensor for industrial and environmental detection applications and emphasize the critical role of nanostructural design in optimizing sensor performance.
研究领域:
材料科学
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纳米技术
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传感器
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气体检测
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表面化学
✓ 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）