Aggregate
·
2024
·Vol. 5
·期 4
·e570
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IF 13.9
Yang Li,Zhenwei Wu,Yanhong Liu,Kun Zhang,Sha Luo,Wei Li,Shouxin Liu
The hydrothermal/soft templating method is an effective way to synthesize ordered mesoporous carbon (OMC), yet the mechanism of this strategy is not well illustrated. Herein, a hydrothermal temperature-controlled approach is developed to precisely synthesize OMCs with well-defined morphologies from liquefied wood (LW). As the hydrothermal temperature increases from 130 to 210°C, the hydrophilicity of the hydrophilic blocks decreases accompanied by the increase of the relative volume of the hydrophobic block, resulting in the packing parameter p of micelles changing from p ≤ 1/3 to 1/3 < p < 1/2, which transforms the micelle's structure from spherical to cylindrical. Additionally, accelerated nucleation occurred with the increased hydrothermal temperature. When the rate of nucleation is matched to the self-assembly of the composite micelles, the composite micelles grow into worm-like morphology and an ordered p 6m mesostructure. This hydrothermal temperature-controlled strategy provides a straightforward and effective approach for synthesizing OMCs with various morphologies from LW, addressing the previously insufficiently elucidated micelle formation mechanism in the hydrothermal/soft templating method.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Shihao Lv,Yong Huang,Zhenzhong Gao,Xianfeng Hou,Jie Yang,Jin Sun
Lignocellulosic biomass is a sustainable alternative to petroleum-derived chemicals for the development of bio-based wood adhesives. However, limited by the complexity and reactivity of biomass, bio-based adhesives are not competitive in terms of physicochemical properties . In this study, a novel bio-based phenol-formaldehyde resin was prepared directly using phenol to liquefy waste sawdust without removing the residue, and modified with a small amount of melamine . The results demonstrated that the melamine-modified bio-based phenol-formaldehyde resin (MBPF) exhibited better physicochemical qualities. Particularly, the free phenol content was 0.36 %, 57.6 % less than in common phenol-formaldehyde resin. Various characterizations of resins showed that liquefied sawdust could successfully substitute phenol in the resin system. Ortho hydroxymethylphenol was produced by an addition reaction between the liquefied sawdust or phenol and formaldehyde during the resin production process. A reticulated cross-linking structure was then formed between the hydroxymethylate liquefied sawdust and polyhydroxymethylphenol through the dehydrated condensation reaction . The degraded sawdust chain segments were successfully embedded in the resin, increased the molecular weight of the resin prepolymer and improved the initial thermal stability. After a tiny amount of melamine was added, the resin produced a denser cross-linked network, which improved resin condensation activity, decreased the curing time, and successfully increased the bonding force between the liquefied sawdust and resin molecules. The wet shear strength of MBPF resin could reach 1.43 MPa, which was equivalent to PF resin.
研究领域:
材料科学
·
林产化学加工工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Wanlong Song,Xiaojun Ma,Liangmu Qiu,Ranran Guo,Xingyu Lu,Bin Sun
Polyaniline (PANI) electrode materials exhibit low capacitance and poor stability due to self-shrinkage and agglomeration in practical applications. In this work, PANI was grown in situ on the framework of the liquefied wood carbon aerogel (LWCA) skeleton by chemical oxidation polymerization to improve the self-agglutination problem of PANI, obtaining the composite electrode material (LWCA-PANI) for hybrid supercapacitors . As expected, Three-dimensional structure of LWCA could effectively hinder the aggregation of polyaniline nanofibers , significantly expanding the accessible area of ions and alleviating volume expansion by preventing stacking to improve capacitive performance. The optimized LWCA-PANI3 electrode material exhibited a remarkable specific capacitance of 507.55 F g −1 at a current density of 0.5 A g −1 , and demonstrated excellent cycle stability with a retention rate of 75.37% after 4000 cycles. Furthermore, the supercapacitor assembled by LWCA-PANI3 demonstrated a largest energy density of 32.08 W h kg −1 at 400 W kg −1 power density and an admirable cycling durability of 76.12% retention for up to 4000 cycles. Consequently, LWCA-PANI3 composites showed a broad application prospect in electrode materials for hybrid supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Hongyu Tian,Lina Zhang,Xiao Sun,Jing Cui,Jingjing Dong,Liang Wu,Yanfeng Wang,Lingli Wang,Min Zhang,Zhiguang Liu,Panfang Lu
Alkali-hydrolyzed lignocellulose was liquefied into polyols by acid-catalyzed dissolution, and then cross-linked with castor oil to prepare bio-based cross-linked polyurethane . Then, bis (2-hydroxyethyl) disulfide (SS) with self-healing function was used to reduce foaming in the curing process of polyurethane coating. Afterwards, disulfide bond modified cross-linked bio-based polyurethane coating (BCSPU) was applied to controlled-release urea (CRU). The results of excitation-emission matrices indicated that SS made the coating smoother and denser and preventing the release of non-film-forming substances. Cross-linking modification technology significantly extended the controlled release longevity of CRU by 77.3%, and the self-healing modification further prolonged the nitrogen release longevity by 61.5%. In addition, modified coating materials were non-toxic to wheat seeds and easily biodegradable in the soil. Cross-linking, self-healing modified controlled-release urea has enormous application potential in sustainable agriculture .
研究领域:
材料科学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）