INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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2021
·
IF 5.584
Shengna Liu,Liancun Zheng
The classical constitutive equations for heat transfer of non-Newtonian fluids in shear flow fields neglect viscous dissipation and the field synergistic properties of rheology and heat transfer. In this paper, a novel constitutive Eq. (6) for rheological synergy thermal conductivity was derived by considering viscous dissipation. Based on this, we established an experimental platform to investigate the heat transfer properties of HEC-based silicon dioxide nanofluids (different nanoparticle sizes and volume fractions) in shear flow field for two cases: neglecting viscous dissipation and considering viscous dissipation. The results show that viscous dissipation have very important effects on heat transfer behavior at different shear rates and rheological properties. The contribution of viscous dissipation to the thermal conductivity increases with shear rate and particle volume fraction, but decreases with temperature. Among all the measured results, the maximum contribution of viscous dissipation to the thermal conductivity reached 19.86%. This confirms that the viscous dissipation is not negligible and the field synergy between rheology and heat transfer of non-Newtonian fluids must be considered in the shear flow fields.
研究领域:
热力学
·
流体力学
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高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 37
·期 1
·205-211
·
IF 1.595
Hanhan Yang,Jinjie Zhang,Yingping Qi,Yongfeng Shen,Hua Li
To enhance the strength of paper cultural relics and prolong the life of paper cultural relics, it is an urgent need to prepare new material for preservation and protection of paper. In this paper, chitosan quaternary ammonium salt/HEC-acrylate was synthesized with O-hydroxypropyl trimethyl quaternary ammonium salt chitosan (O-HACC) and Hydroxyethyl Cellulose (HEC)-acrylate emulsion, the synthesized materials has multiple functions, such as deacidification, reinforcement, anti-mildew and antibacterial etc. The synthesized new materials were applied on paper, and their protective effect was evaluated by testing the mechanical and optical properties and antibacterial properties of the paper. The results showed that when the mass concentration of O-HACC was 0.6 %, the tensile strength, folding times and tearing strength of the paper coated with protective solution were improved to a certain extent, while the optical properties and appearance of the paper remained basically unchanged. Meanwhile, the paper also had certain anti-mildew and bacterial resistance.
研究领域:
材料科学
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文物保护
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 2
·140
·
IF 2.8
Ma Di,He Hao,Huang Xinglan,Wang Jingcheng,Hu Xuebu
The inhomogeneous plating/stripping of zinc and side reactions originating from the dissolution of the cathode material in water lead to the poor stability of zinc anode, which inevitably limits the practical application of zinc-based aqueous batteries. Therefore, a novel hydrogel electrolyte made of hydroxyethyl cellulose/polyacrylamide (HEC/PAM) with a 3D network-like structure is synthesized by radical polymerization and cross-linking reinforcement. Thanks to the porous crosslinked network and massive hydrophilic groups, the electrolyte has high ion conductivity of 3.17 × 10 –2 S cm −2 and decomposition voltage of 2.6431 V. The ion conductive hydrophilic groups facilitate the interfacial compatibility of the electrode with the electrolyte and stabilize zinc plating/stripping, which suppresses the formation of zinc dendrites. Meanwhile, the hydrogel electrolyte effectively alleviates the dissolution of the positive electrode and the occurrence of side reactions, and subsequently improves the stability of the electrode. As a result, the assembled Zn–Zn symmetric cell with HEC/PAM hydrogel electrolyte is stable without short circuit and rapid increase of overvoltage at 5 mA cm −2 . The polarization voltage of the assembled Zn–Cu half-cell is 59.2 mV and initial coulomb efficiency reaches 94.3%. The assembled Zn–V 2 O 5 ·nH 2 O/CNT full cell delivers an excellent cycling stability of 186.9 mAh g −1 at 0.5 A g −1 after 500 cycles with a high-capacity retention of 92.5% (only 52.1% in aqueous system). The new idea is provided for further development of functional hydrogel electrolytes in zinc-ion batteries.
研究领域:
电化学
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能源材料
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功能高分子
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电池技术
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界面化学
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DOI
高影响因子
TRIBOLOGY LETTERS
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2025
·Vol. 73
·期 4
·1-16
·
IF 3.3
Sheng Dezun,Yu Hongliang,Zhang Xiao,Zhou Xin
Reducing alloy friction to achieve ultra-low friction is a valuable approach to save energy and reduce pollution from oil use, which is a major challenge for researchers. This study introduces a successful method to achieve ultra-low friction in Ti-6Al-4 V using a hydrated lubricant composed of hydroxyethyl cellulose (HEC). And the effects of speed and concentration on lubricating were investigated. It was found that excessive sliding speeds may lead to lubricant detachment and consequent friction increase, indicating that the adsorption ability of HEC needs to be enhanced in future studies. In addition, when the concentration exceeds 5 wt%, wear loss tends to stabilize across tests with different concentrations, while the friction force increases with rising concentrations. Based on these findings, microscopic studies were conducted to investigate the mechanism of friction reduction. Notably, distinct topographic features resembling ‘valleys’ and ‘plateaus’ were identified on the wear scars in a nanoscale scope. The movement of the surfaces induces the hydrated HEC lubricant to flow from the lower valleys to the higher plateaus, suggesting elastohydrodynamic lubrication mechanisms to form robust films. The valleys serve as lubricant reservoirs, while the plateau tops support the lubricant films to prevent contacts between Ti-6Al-4 V and Si 3 N 4 . The schematic illustrations depict the microscopic mechanisms for achieving of ultra-low friction on Ti-6Al-4 V alloy.
研究领域:
摩擦学
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材料科学
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润滑工程
·
表面化学
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
·
IF 5.4
Dongyu Si,Haoxin Shao,Shuo Zhang,Yongkun Hao,Zhiyan Yan
A multi-cross-linked conductive hydrogel (ANHP) with HEC/PEDOT:PSS enhancement is designed for underwater motion sensing. • The ANHP hydrogel exhibits ultra-low equilibrium swelling ratio, outstanding tensile properties and high toughness. • The ANHP hydrogel sensor has high sensitivity, wide strain response range, fast response time and excellent cyclic stability. • The ANHP hydrogel detects multi-joint motions in air and underwater, and provides emergency signal sending via Morse code. Flexible conductive hydrogels, as core candidate materials for next-generation wearable sensors and underwater detection devices, show great potential for applications in Marine engineering, biomedical monitoring, and other fields. However, traditional conductive hydrogels tend to excessive swelling in the water environment due to abundant hydrophilic groups in their network structure, resulting in mechanical degradation and distortion of sensing signals, which seriously restricts their practical application in underwater scenarios. In this study, acrylamide (AM) and N-hydroxymethylacrylamide (NMA) were used as copolymerization monomers, hydroxyethyl cellulose (HEC) as the core biobased skeleton and multifunctional regulatory medium, and PEDOT:PSS as the high-conductivity functional filler to successfully construct a hydrogel (ANHP) with a multiple cross-linked structure. The test results show that the prepared hydrogel exhibits an extremely low equilibrium swelling ratio (3%), excellent tensile properties (0.614 MPa, 1343.81%), high sensitivity (GF = 3.35), a wide strain response range (0–400%), a fast response time (0.25 s), and outstanding cyclic stability over 500 cycles. The hydrogel-based sensor can stably detect human motions underwater and realize underwater Morse code communication. This study provides an innovative strategy for the development of high-performance underwater flexible sensors and an important reference for the high-performance and multifunctional application of carbohydrate-based functional materials. Download: Download high-res image (205KB) Download: Download full-size image Synthetic route and structural diagram of ANHP hydrogel.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
M.Y. Zhang,M.X. Li,Z. Chang,Y.F. Wang,J. Gao,Y.S. Zhu,Y.P. Wu,W. Huang
A sandwich structure-like PVDF/HEC/PVDF polymer membrane is reported as host for matrix of gel polymer electrolytes for lithium ion batteries. The inner HEC (hydroxyethyl cellulose) layer is compact, and can avoid micro short-circuits. The producibility of the composite membrane is guaranteed due to the simple and efficient electro-spinning process for manufacturing the PVDF (poly(vinylidene fluoride)) layer and low-cost and eco-friendly HEC layer. This structure integrates the advantages of the HEC and PVDF, and it presents high uptake of liquid electrolyte (135.4%), excellent retention of liquid electrolyte, high ionic conductivity (0.88 mS cm −1 at ambient temperature), low activation energy for lithium movement (0.016 eV), and high lithium ion transference number ( t + = 0.57), all properties are superior to those of the pure HEC membrane and commercial polyolefin separator (Celgard 2730). With the PVDF/HEC/PVDF gel polymer electrolyte as the electrolyte and separator, the assembled Li//LiFePO 4 cell exhibits a notably high discharge capacity (140 mAh g −1 ) over 140 cycles. The PVDF and HEC components are non-combustible, which is in sharp contrast with the combustible polymers for the commercial separators. These results show that this kind of sandwiched gel polymer electrolyte is promising for scale-up of lithium ion batteries especially those needing high safety and reliability.
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高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Shuaijun Yang,Mei Wang,Yetong Lv,Huilin Sheng,Yexia Qin
Oxidation resistance is crucial to the potential applications of high-entropy carbides (HECs) at elevated temperatures. Here, we realize the exploration of (Hf, Ta, Zr, Cr)C high-entropy carbides (HEC-TM, TM = Hf, Zr, Ta, and Cr) with good oxidation resistance by optimizing their compositions. To be specific, 21 kinds of HEC- x TM ( x = 0–25 mol%) samples are fabricated by a high-throughput ultrafast high-temperature sintering technique, followed by oxidation testing at 1673 K for 30 min. Among all the HEC samples, the as-fabricated HEC-0Zr samples are proved to possess the best oxidation resistance with an oxidation depth of only 53 µm. Further study on isothermal oxidation kinetics demonstrates that the as-fabricated HEC-0Zr samples follow a linear oxidation law. The good oxidation resistance of the as-fabricated HEC-0Zr samples is believed to result from the (Ta, Me) 2 O 5 phase with a low melting point, which can promote the densification of the oxide layer. This research opens up a new way for efficiently discovering new HECs for extreme applications.
研究领域:
材料科学
·
高温材料
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chunqing Yang,Dongzhi Zhang,Dongyue Wang,Huixin Luan,Xiaoya Chen,Weiyu Yan
Flexible strain sensors have significant progress in the fields of human–computer interaction, medical monitoring, and handwriting recognition, but they also face many challenges such as the capture of weak signals, comprehensive acquisition of the information, and accurate recognition. Flexible strain sensors can sense externally applied deformations, accurately measure human motion and physiological signals, and record signal characteristics of handwritten text. Herein, we prepare a sandwich-structured flexible strain sensor based on an MXene/polypyrrole/hydroxyethyl cellulose (MXene/PPy/HEC) conductive material and a PDMS flexible substrate. The sensor features a wide linear strain detection range (0–94%), high sensitivity (gauge factor 357.5), reliable repeatability (>1300 cycles), ultrafast response–recovery time (300 ms), and other excellent sensing properties. The MXene/PPy/HEC sensor can detect human physiological activities, exhibiting excellent performance in measuring external strain changes and real-time motion detection. In addition, the signals of English words, Arabic numerals, and Chinese characters handwritten by volunteers measured by the MXene/PPy/HEC sensor have unique characteristics. Through machine learning technology, different handwritten characters are successfully identified, and the recognition accuracy is higher than 96%. The results show that the MXene/PPy/HEC sensor has a significant impact in the fields of human motion detection, medical and health monitoring, and handwriting recognition.
研究领域:
材料科学
·
生物医学工程
·
人工智能
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Shao-Hua Wen,Ning Wang,Ziqi Yuan,Hao Wu,Gege Yan,Hengyuan Zhang,Sha Yu,Junping Ma,Yuanzhen Zhou
The design of novel homogeneous electrochemical (HEC) sensors with dual-signal ratiometric response holds great potential for highly sensitive and reliable detection of arsenic in food matrices. Herein, COF-based hybrids were prepared by integrating methylene blue (MB) signals and MnO 2 nanozyme coatings, possessing the advantages of high signal loading, oxidase-mimicking activity, and ascorbic acid (AA)-specific recognition to realize ratiometric HEC detection of arsenate. The hydrolysate AA, produced from ALP-catalyzed AAP hydrolysis, could decompose MnO 2 coatings into Mn 2+ , and regulate MB release and o -phenylenediamine oxidation to 2,3-diaminophenazine (DAP). Furthermore, arsenate specifically inhibited ALP, subsequently restraining AA formation and MnO 2 decomposition. Consequently, a decreased MB current and an increased DAP current with opposite responses were regulated by arsenate compared with those without arsenate. Thus, this dual-signal ratiometric HEC sensor achieved sensitive detection of arsenate, with a LOD of 0.509 ppb. It was successfully applied to reliable detection of arsenate in complex food matrices.
研究领域:
食品安全检测
·
分析化学
·
电化学传感
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xiangdong Wang,Kexin Yu,Ran An,Linglin Han,Yulin Zhang,Lingying Shi,Rong Ran
Graphene oxide(GO), as an amphiphilic and biocompatible material, is often used to prepare Pickering emulsion. However, the preparation of stable Pickering emulsion by a low concentration of GO is very challenging. In this research, we prepared the hydrophobic modified hydroxyethyl cellulose (mHEC) which contained quaternary ammonium group and GO which the water contact angle was 84°–86°. A stable, low cost, and biocompatible Pickering emulsion was fabricated by a low concentration of GO and different contents of mHEC. The effects of mHEC concentration, electrolyte concentration, pH, and oil/water ratio on the stability of Pickering emulsion were investigated. What’s more, we prepared the biomedical macroporous polyacrylamide hydrogel by the GO/mHEC composite stabilized emulsion template for drug controlled-release. The composite hydrogel by Pickering emulsion template is a potential drug controlled-release delivery platforms. Furthermore, our strategy is extremely versatile, as Pickering particles, polymer and the monomer of hydrogel can all be varied.
研究领域:
材料科学
·
生物医学工程
·
药学
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产品关联
DOI
PubMed
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2019
·Vol. 188
·期 3
·769-786
·
IF 2.14
Li Chan,Zhang Wen,Yang Ning,Zhang Qing Song
As one of the typical phyllosilicate clays, hectorite (Hec) has some excellent characteristics and has been greatly applied in adsorption field for the removal of dye, endotoxin, etc. In this study, organic Hec nanocomposites modified with l -Lysine (Lys/Hec NCs) were prepared via solution intercalation method for BR removal. The effects of ionic strength, pH values, initial concentration of BR, and BSA concentration on the adsorption capacity for BR of Lys/Hec NCs were investigated. Results indicated that the adsorption capacity for BR of nanocomposites could reach 40 mg/g when the initial bilirubin concentration was 200 mg/L. However, the adsorption amount of Lys/Hec NCs decreased with increasing the concentration of BSA, but Lys/Hec NCs could still maintain a higher adsorption rate. The adsorption kinetics and adsorption isotherms indicated that the adsorption process of Lys/Hec NCs agreed well with the pseudo-second-order model and the Langmuir isotherm, respectively. Moreover, Lys/Hec NCs also exhibited excellent cytocompatibility. These obtained results demonstrate that Lys/Hec NCs prepared in this study had great potential to be used in hemoperfusion.
研究领域:
生物医学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Shuang Xia,Yuanyuan Bai,Ju Bai,Shen Yuan,Shengzhao Li,Ting Zhang,Tie Li
Flexible sensors that interface the physical world with digital intelligence have faced a trade-off among sensing accuracy, response selectivity, and signal decoupling. This key challenge arises from the design of high-performance sensitive materials. In this study, a dual-mode flexible sensor is assembled by a new-style dual-gradient HEC-CNT/Bi 2 Te 3 nanowire aerogel prepared via the synchronous processes of directional freeze casting and gravity-induced self-sedimentation. This cooperative top-to-bottom pore-size and bottom-to-up compositional dual-gradient architecture enables the effective spatial partitioning of pressure and temperature sensing behaviors via generating two independent response patterns for piezoresistive and thermoelectric mechanisms, respectively. As a result, the derived device possesses the ultra-low pressure and temperature detection limit/resolution of 5 Pa/2 Pa (sensitivity of −7.97% kPa −1 ) and 0.1 K/0.1 K (Seebeck coefficient of −20.79 µV K −1 ) without any mutual interference, respectively, which is perfectly superior to that of a non-gradient device. Furtherly, this capability of the device is leveraged for robust pattern recognition and predictive analytics, achieving the ultrahigh identification accuracies of 100% and 97% for the effective warning capacities of battery thermal runaway and skin inflammation stages via using the latest convolutional neural network algorithm with transfer learning, respectively. This dual-gradient strategy establishes a feasible design paradigm for high-precision multimodal perception.
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