THERMOCHIMICA ACTA
·
2018
·
IF 2.189
Xiaohui Fu,Yunfei Liu,Xiaowei Jiang,Qiuliang Wang,Yali Luo,Yinong Lyu
Two kinds of hypercrosslinked polymer nanospheres (HCPNs), which were synthesized via Friedel-Crafts and Scholl coupling reactions, were used as porous matrix to prepare form-stable phase change materials nanocomposites (HCPNs-PCMs). Owing to the large BET surface area and the strong hydrophobicity of HCPNs, PCMs (palmitic acid and 1-octadecanol) can be absorbed spontaneously into HCPNs. The properties of HCPNs-PCMs have been characterized via scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The DSC results showed that the HCPNs-PCMs had latent heats of 111.8−134.9 J g −1 . The mass fraction of PCMs in HCPNs-PCMs ranged from 71.4 wt% to 74.5 wt%. After 300 melting and freezing cycles, the nanocomposites maintained their phase transition properties perfectly, indicating excellent recyclability and high thermal stability.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2020
·
IF 3.762
Nianrong Feng,Yexin Liang,Dongying Hu
In this study, the porous bamboo material (DB) was obtained by removing the intercalated substance between the fibers through a simple delignification process, and was used as support matrix by impregnating a reversible thermochromic compound (BP: BPA: TD) to prepare a shape-stable bamboo-based composite reversible thermochromic phase change material (TBB-DB). Fourier Transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis of bamboo and DB showed that lignin was removed from bamboo by the delignification process. The open porous structure founded in scanning electron microscopy micrographs allows the rapid impregnation of TBB to achieve reversible thermochromic and phase change storage properties. The reduction in surface roughness and contact angle leads to an increase in the hydrophilicity of the DB for the subsequent impregnation of the TBB into the porous structure of DB. DB also showed good mechanical properties and thermodynamic stability. The effects of different proportions of the color developer and the solvent in the compound TBB on the reversible thermochromic and phase change energy storage properties of TBB-DB were investigated. TBB-DB1:4:50 showed a better reversible thermochromic properties and energy storage properties (the highest latent heat, favorable melting and crystallization temperatures). As for TBB-DB1:4:50, the FTIR, XRD, thermal stability analysis showed that there is no chemical reaction occurred during the entire impregnation process, which is conductive to the reversible thermochromic phase change energy storage characteristics of TBB-DB1:4:50. The color of TBB-DB1:4:50 changed from rose red to white as the temperature increased. Compared with DB, TBB-DB1:4:50 showed endothermic and exothermic peaks, and its ΔH m and ΔH L+S were 113.5 J g −1 and 109.8 J g −1 , respectively, indicating that TBB1:4:50 was well impregnated into DB to form a composite phase change material. TBB-DB1:4:50 also has good durability, making it able to withstand long-term recycling and maintain the original excellent performance.
研究领域:
材料科学
·
高分子化学
·
能源储存
·
功能材料
·
纳米复合材料
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 49
·2104701
·
IF 18.808
Zhongxiang Bai,Kun Jia,Chenchen Liu,Lingling Wang,Guo Lin,Yumin Huang,Shuning Liu,Xiaobo Liu
Hydrogel modified porous matrix with the super-wetting surface (i.e., super-hydrophilic/underwater super-oleophobic) is ideal for oil/water separation. However, the deterioration in mechanical strength and separation efficiency during the swelling process and complicated synthesis procedure limits its industrial application. In this study, a strategy of using ethanol to dynamically regulate the hydrogen bond crosslinking between polyvinyl alcohol (PVA) and tannic acid (TA) is proposed to prepare a “hydrogel paint”, which can be simply applied on the porous substrate surface by different one-step operations (dipping, brushing, spraying, etc.) without additional cross-linking. The underline mechanism is attributed to the re-establishment of intermolecular hydrogen bond mediated cross-linking between PVA and TA during ethanol evaporation. Consequently, the resultant hydrogel coating exhibits ultra-high strength (>10 MPa), swelling volume stability, and excellent oil-water separation efficiency (>99%). This study will provide new insights into the scalable fabrication of hydrogel-coated porous materials for oil/water separation in industrial scenarios.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
·
2024
·
IF 18
Yinghao Li,Dongling Xiao,Weixi Yan,Meilin Jiang,Ju Tan,Zhongliang Qin,Jingting Zhou,Yue Sun,Mingcan Yang,Guanyuan Yang,Yawei Gu,Yong Liu,Chuhong Zhu
Timely and stable sealing of uncontrolled high-pressure hemorrhage in emergency situations outside surgical units remains a major clinical challenge, contributing to the high mortality rate associated with trauma. The currently widely used hemostatic bioadhesives are ineffective for hemorrhage from major arteries and the heart due to the absence of biologically compatible flexible structures capable of simultaneously ensuring conformal tough adhesion and biomechanical support. Here, inspired by the principle of chromatin assembly, we present a tissue-conformable tough matrix for robust sealing of severe bleeding. This hierarchical matrix is fabricated through a phase separation process, which involves the in-situ formation of nanoporous aggregates within a microporous double-network (DN) matrix. The dispersed aggregates disrupt the rigid physical crosslinking of the original DN matrix and function as a dissipative component, enabling the aggregate-based DN (aggDN) matrix to efficiently dissipate energy during stress and achieve improved conformal attachment to soft tissues. Subsequently, pre-activated bridging polymers facilitate rapid interfacial bonding between the matrix and tissue surfaces. They synergistically withstand considerable hydraulic pressure of approximately 700 mmHg and demonstrate exceptional tissue adhesion and sealing in rat cardiac and canine aortic hemorrhages, outperforming the commercially available bioadhesives. Our findings present a promising biomimetic strategy for engineering biomechanically compatible and tough adhesive hydrogels, facilitating prompt and effective treatment of hemorrhagic wounds.
研究领域:
生物材料
·
生物医学工程
·
组织工程
·
止血
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Water
·
2024
·Vol. 2
·期 9
·899-910
·
IF 0
Wu Tong,Hou Yinglai,Liu Zengwei,Li Yuzhen,Wang Lingling,Wu Guosong,Sheng Zhizhi,Sun Jiapeng,Zhang Xuetong
The introduction of a functional liquid into a porous membrane has appeared recently. Yet, how to selectively confine the functional liquid into a hierarchically porous matrix to achieve reverse functions of emulsification and demulsification in one membrane remains elusive. Here the hierarchical porous aerogel membrane can be created by simultaneously taking advantage of reprotonation, non-solvent-induced phase separation and chemical-triggered sol–gel transition of the mixture of aramid nanofibre and polyvinylpyrrolidone to only confine the aqueous phase in nano spaces. By regulating the given pressure, selectively in situ liquid-infused aerogel membranes (SILAMs) can be commanded for emulsification or demulsification. In emulsification mode, SILAMs can produce uniform emulsions with tailorable sizes and outstanding stability for up to 10 weeks. Compared with other emulsification membranes, SILAMs produce smaller-sized emulsions at lower energy consumption. Notably, the discrimination among micro- and nano-emulsions is showcased by rationalizing the pore structure of the hierarchical porous aerogel membrane and tuning the driven pressure on SILAM. In a demulsification manner, SILAMs can realize efficient oil and water separation with sustained anti-fouling performance from both emulsions and mixture with arbitrary oil/water ratio. The oil–water separation factor of SILAMs is up to 99.97% and can be cycled up to 30 times to purify real ship wastewater. These unique SILAMs can promote the development of smart membranes for various applications, ranging from water treatment, materials fabrication and food industry to the petrochemical industry.
研究领域:
材料科学
·
化学工程
·
环境科学
·
膜技术
·
纳米技术
✓ 已验证
DOI
危险品化学品经营许可证（带存储）