INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jinze Wang,Zhaoji Dong,Jiatian Li,Jiarui Lu,Sicong Tan,Qian Feng,Zhaoyang Xu
Graphene exhibits exceptional electrical properties, and aerogels made from it demonstrate high sensitivity when used in sensors. However, traditional graphene aerogels have poor biocompatibility and sustainability, posing potential environmental and health risks. Moreover, the stacking of their internal structures results in low compressive strength and fatigue resistance, which limits their further applications. In this study, green and sustainable cellulose nanofibers/sodium alginate/reduced graphene oxide aerogels (BCSRA) were synthesized, featuring a well-defined lamellar structure and a fiber cross-linked network, employing techniques such as bidirectional freeze-drying, ionic cross-linking, and thermal annealing. The unique internal architecture of BCSRA results in a compressive strength of up to 64.55 kPa at 70 % compression deformation and an extremely low density of merely 7.21 mg/cm 3 . Furthermore, BCSRA displays outstanding fatigue resistance, maintaining 82.17 % of its stress after 100 compression cycles at 70 % compressive strain and 86.99 % after 1000 cycles at 50 % compressive strain. Remarkably, when utilized as a flexible pressure sensor, BCSRA achieves a sensitivity of 5.71 kPa −1 and endures over 2200 cycles at 40 % compression, all while ensuring consistent electrical signal output. These properties underscore its significant potential for application in wearable flexible pressure sensors, capable of detecting various human movements.
研究领域:
材料科学
·
生物医学工程
·
可持续材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 11
·6755-6768
·
IF 3.917
Zhou Ying,Fu Jing-Jing,Wang Lin-Xiang,Lu Zhisong,Wang Feng,Xia Qingyou,Kang Yuejun,Li Chang Ming,Yu Ling
Abstract A novel free-standing gelatin-impregnated polypropylene nonwoven (gelatin @PP nonwoven hybrid sheet) was prepared by loading gelatin hydrogel on nonwoven fabric, followed by a freeze-drying procedure. Formation of gelatin in the gaps between the PP fibers significantly increased the pore ratio of the scaffolds. In addition, the freeze-drying prepared gelatin enabled fast liquid absorption and rapid swelling. The cell adhesion and cell proliferation assays showed that the gelatin @PP nonwoven hybrid is a ready-to-use substrate for cell-based assays. Cell immunoassay was conducted to measure the protein expression on cells which were cultured on gelatin @PP nonwoven hybrid sheet. In addition, the freeze-drying prepared gelatin @PP nonwoven hybrid sheet was applied for assembling multilayer stacking for 3D cell culture. The ready-to-use convenience of the gelatin @PP nonwoven hybrid was ensured, as the physicochemical properties (chemical group, pore ratio, and swelling rate) and cell compatibility were well preserved after 90 days of storage. Graphic abstract A novel free-standing gelatin-impregnated polypropylene nonwoven (gelatin @PP nonwoven hybrid) was prepared as a ready-to-use substrate for cell culture.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Kaiming Zhu,Cunbao Gu,Xuanpu Zhou,Haoyang Li,Zichao Zhang,Haoran Cao,Kexin Liu,Jiamu Cui,Yihe Huang,Xiaochuang Ye,Qida Tian,Yirui Yang,Jianmin Song
AlN based phosphors have a wide range of applications and the green and blue emission of AlN:Eu 2+ phosphors have been reported a lot, while we found yellow emission in this phosphor. In this work, a series of different concentrations of Ca 2+ -doped AlN:Eu 2+ phosphors have been successfully prepared by a freeze drying assisted combustion synthesis, of which the crystal structure, morphology, photoluminescence properties and luminescence mechanism were studied in detail. The results show that Ca 2+ ions have been successfully doped into the AlN:Eu 2+ lattice and cause the lattice distortion, which has a great influence on the luminescent properties of the phosphors. Under the 365 nm excitation, the phosphors present a single emission peak, which is ascribed to the 4f 6 5d-4f 7 transitions of Eu 2+ ions. Furthermore, by increasing the doping amount of Ca 2+ ions (0.1, 0.5, 1 and 3 at %), the emission wavelength can be tuned from 516 to 535 nm, corresponding to the emission color from green to yellow, which is owing to the enhancement of the crystal field intensity around Eu 2+ ions through the interaction between Ca 2+ and Eu 2+ ions. Tuning of the emission wavelength for AlN:Eu 2+ phosphors is of great importance in expanding the applications of AlN:Eu 2+ phosphors in various luminescent fields.
研究领域:
材料科学
·
发光材料
·
磷光体制备
·
光学性能
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 4
·712
·
IF 3.164
Lijie Zhou,Shengcheng Zhai,Yiming Chen,Zhaoyang Xu
Under the current situation of frequent oil spills, the development of green and recyclable high-efficiency oil-absorbing aerogel materials has attracted wide attention from researchers. In this study, we report a high-strength, three-dimensional hydrophobic cellulose nanofiber (CNF)/polyvinyl alcohol (PVA)/graphene oxide (GO) composite aerogel with an anisotropic porous structure, which was fabricated by directional freeze-drying technology using anisotropically grown ice crystals as a template, followed by hydrophobic treatment with a simple dip coating process. The prepared composite aerogel presented anisotropic multi-level pore microstructures, low density (17.95 mg/cm3) and high porosity (98.8%), good hydrophobicity (water contact angle of 142°) and great adsorption capacity (oil absorption reaching 96 times its own weight). More importantly, the oriented aerogel had high strength, whose compressive stress at 80% strain reached 0.22 MPa and could bear more than 22,123 times its own weight without deformation. Therefore, the CNF/PVA/GO composite aerogel prepared by a simple and easy-to-operate directional freeze-drying method is a promising absorbent for oil-water separation.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2026
·
IF 5.1
Jiaoyuan Lu,Xiaojun Tang,Huiting Bi
Compared with α-, β- and γ-MnO2, δ-MnO2 possesses a large interlayer spacing, abundant active sites and high compatibility with aqueous electrolytes. Due to these advantages, δ-MnO2 is considered a potential candidate for efficient aqueous zinc-ion battery and high-safety energy storage systems. Nevertheless, its structural instability and suboptimal electrical conductivity hinder it from being an ideal electrode material. In this study, a 3D conductive framework was fabricated by uniformly integrating δ-MnO2 and ultrathin rGO nanosheets through a simple freeze-drying process. The introduction of rGO endows the δ-MnO2/rGO composites with a unique “conductive network–dispersion support” structure. The as-constructed 3D architecture effectively overcomes the intrinsically low conductivity of δ-MnO2 and decreases the charge transfer resistance. Meanwhile, the porous framework enlarges the electrode–electrolyte contact area, accommodates the volume variation and lattice distortion during Zn2+ insertion/extraction, and thus maintains structural integrity upon long-term cycling. Consequently, the δ-MnO2/rGO electrode exhibits excellent cycling stability, with a maximum specific discharge capacity of 127.6 mAh g−1 at 1 A g−1, which remains at 82.1 mAh g−1 after 600 cycles. The specific capacity is obviously better than that of δ-MnO2 (63.2 mAh g−1 after 450 cycles).
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 5
·e70780
·
IF 4.2
Yu Ma,Huangshuai Zhang,Zhenting Zhu,Zihao Yang,Jinglong Zhang,Xiaoyu Wu,Hang Zhang
Alumina aerogels are attractive for thermal insulation due to their ultralow thermal conductivity and excellent high-temperature resistance, but the high cost of organic aluminum alkoxide precursors limits large-scale use. Inorganic aluminum salts are low cost and stable but unsuitable for conventional supercritical or ambient pressure drying. Herein, aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) with tert-butanol/water cosolvent was employed to prepare alumina aerogels via vacuum freeze-drying. The freeze-dried aerogels were crack-free with tunable properties. Increasing precursor concentration enhanced specific surface area (SSA) and mechanical strength, though with higher density and thermal conductivity. The minimum density and thermal conductivity are 0.066 g/cm 3 and 0.028 W/(m·K), whereas the maximum SSA and Young's modulus are 364.74 m 2 /g and 343.07 kPa. The aerogels maintained thermal conductivity below 0.190 W/(m·K) up to 1200°C, but at 1400°C phase transformation to α-Al 2 O 3 caused severe skeleton coarsening and degraded thermal insulation. This study provides a potentially cost-effective and efficient fabrication route for monolithic alumina aerogels.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Kezhuo Li,Jin Luo,Longhao Dong,Gaoqian Yuan,Wen Lei,Quanli Jia,Haijun Zhang,Shaowei Zhang
Porous ceramics have attracted extensive attention because of their high porosity, low thermal conductivity , large specific surface area and good corrosion resistance . In this work, TiN porous ceramics with high porosity are successfully prepared via the combination of freeze-drying and in-situ nitridation reaction method using Ti powder and chitosan as raw materials. The influence of the solid content of Ti powder, the concentration of chitosan/acetic acid solution and the nitridation temperature on the morphologies and physical properties of as-prepared TiN porous ceramics are fully investigated. The sample with high porosity of 92.8% and low bulk density of 0.27 g/cm 3 can be obtained through optimal parameters (the solid content of Ti powder is 9.6 wt%, the concentration of chitosan/acetic acid solution is 5 wt%, and the nitridation temperature is 1473 K). Particular emphasize is that the as-prepared TiN porous ceramics can be used as sulfur host material for lithium-sulfur batteries (LSBs). Good rate performance and cycle stability of TiN/S electrodes are achieved by electrochemical performance tests. The initial discharge capacity of TiN/S electrodes is 778 mAh g −1 at 0.5C, and the capacity retention rate is 94% after 200 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Qingyu Luo,Wei Xu,Shaolong Tang
Exploring excellent catalysts for oxygen reduction reaction (ORR) with a facile and cost-effective method is desirable but remains challenging. Herein, ultra-small PtCu 3 nanoparticles ( ca. 2.7 nm), immobilized on reduced graphene oxide (rGO), were synthesized via a novel and general strategy. Traceless protectant, NH 4 OH, was used to resist the aggregation of graphene oxide (GO), and the spray-freeze-drying method ensures excellent dispersion of the Pt and Cu precursors, which could not be achieved by other reported drying methods. After annealing, the nanoparticles with the highest mass loading, 52%, among reported ordered Pt-based catalysts were obtained. The PtCu 3 /rGO shows a remarkable electrocatalytic performance. Density functional theory calculations elucidate that PtCu 3 possess a lowered energy barrier of the rate-determining step, contributing to significantly improved ORR kinetics. This strategy was extended to the synthesis of other binary- and quaternary-metallic Pt-based nanoparticles, which proved its generality and applicability towards the potential commercialization of fuel cell technologies.
研究领域:
材料科学
·
催化化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 27
·13097-13108
·
IF 4.682
Feng Peiyuan,Wang Xiwen,Yang Jin
Cellulose-based aerogels have become a great potential for oil absorption applications due to their wide range of sources, low density, and good adsorption properties. However, many reported cellulose-based aerogels to have the drawbacks of low oil recovery rate and poor mechanical, which limit their application. In this study, high reusable and excellent mechanical properties silylated TEMPO-oxidized nanofibers/polyvinyl alcohol aerogels (STPA) were fabricated through a three-step process of aqueous silylation, bidirectional freezing, and freeze-drying. A bidirectional freezing technique was employed to obtain two unique structural aerogels by adjusting the methyltrimethoxysilane concentration. The STPA possessed many excellent physical properties, such as ultralight (9.79 mg/cm3), hydrophobicity (136°), and compressibility; as an adsorbent, STPA showed high adsorption capacity (51–111 g/g) for various types of organic solvents. Furthermore, the excellent compressibility enables STPA fast and highly efficient recovery of the absorbed oil by simple mechanical squeeze. It possesses an excellent oil recovery rate of 80% and maintains around 90% of its initial saturated absorption capacity after 50 cycles of absorption–squeezing. Therefore, the successful microstructure design of the biomass-aerogel through bidirectional freezing could provide new thoughts for the design of multifunctional oil absorbents and STPA with good mechanical properties and reusability showing promising prospects in the field of water treatment. Graphical abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jie Li,Jiaqi Lu,Kaihang Zhang,Jianhui Wu,Chi Zhang,Xinyu Cai,Liangquan Xu,Zhen Cao,Yubo Li,Xiaozhi Wang,Hao Jin,Shurong Dong,Jikui Luo
Flexible pressure sensors are essential and key components for wearable electronics, but they have many limitations. The requests for a simple, fast, and low-cost fabrication method for ultrasensitive sensors hold practical significance. In this paper, we introduce an innovative ionic film with gradient porous structures and high ionic conductivity, synthesized using a facile casting and freeze-drying method, to fabricate flexible iontronic pressure sensors. We demonstrate that low synthesis temperatures markedly enhance hydrogen bond number of the ionic films, as revealed by Molecular Dynamics simulation, thereby significantly increasing the ionic conductivity of the film to an impressive value of 6.62 mS/cm, more than twice of the best values reported. The films exhibit a composite structure comprising layered pores and a rough surface. Leveraging these properties, this ionic film-based iontronic capacitive pressure sensor achieves an unprecedented sensitivity of 13786.2 kPa −1 and a broad pressure sensing range of 300 kPa, and is capable of distinguishing subtle pressures as low as 0.1 Pa, featuring a remarkably swift response time of 8 ms. We demonstrate that the sensor and its array could perform sensitive and accurate monitoring of physiological information and physical activities, and act as an excellent human–computer interface. This study offers an innovative and scalable approach to dramatically enhance sensor performance for various applications.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Hui Yang,Tong Zhang,Xiaotong Lu,Pingyun Yuan,Xiaocheng Li,Congdi Shang
Developing hydrogels capable of safeguarding probiotics against harsh upper gastrointestinal (GI) tract (stomach and small intestine) remains a pivotal challenge for effective colon delivery. Herein, we engineer imine cross-linked hydrogels by integrating oxidized konjac glucomannan (OKGM) into gelatin networks, creating mechanically robust and upper GI-tolerant carriers for probiotic protection. The dynamic covalent networks synergistically enhance mechanical robustness (elastic modulus: 5970 Pa, rupture stress: 13700 Pa) and tolerance to upper GI environments, alongside thermotolerance at 37 °C and self-healing properties. The hydrogel demonstrates minimal swelling in simulated gastric fluid (SGF) and programmed degradation in simulated small intestinal fluid (SIF), effectively shielding probiotics from acidic inactivation and enzymatic attack. With only 7.7 % OKGM, the system achieves 96 % encapsulation efficiency and sustains exceptional probiotic viability: 89 % survival post-SGF and 85 % post-SIF, outperforming conventional gelatin carriers. Notably, scanning electron microscopy (SEM) confirms that the hydrogel network preserves probiotic structural integrity even after freeze-drying—a critical advancement for industrial storage and scalability. The synergy between dynamic imine networks and OKGM/gelatine biopolymers ensures dual functionality: (1) buffering mechanical stresses during SGF and SIF transit, and (2) programmed degradation for colon-specific payload release. This work establishes a rational strategy to engineer gelatin-based hydrogels with spatially resolved GI resistance, addressing the core limitation of current oral delivery systems—premature probiotic inactivation in the upper GI tract. By enabling controlled colon delivery of viable probiotics, our findings advance the development of functional foods and therapeutic formulations requiring localized microbial activity.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Weiqiang Hu,Lei Wang,Zongqing Ma,Liming Yu,Yongchang Liu
This work proposed an innovative technology to fabricate Mo–La–O nanoparticles strengthened Mo alloys with ultrafine nano grains via freeze-drying and low temperature sintering . These novel nano Mo–La–O particles including La 7 Mo 7 O 30 , La 5 Mo 3 O 16 , La 6 Mo 2 O 15 , La 5 Mo 4 O 12 , La 4 Mo 2 O 11 and La 2 (MoO 6 ) remain coherent or semi-coherent interfaces with Mo matrix to strengthen their phase boundaries. Moreover, nano Mo–La–O particles enriched in excess oxygen absorb nearby impurity oxygen and then lead to the purification of Mo matrix. Furthermore, the low temperature sintered Mo–La x Mo y O z alloys possess high relative density (98.1%), which is due to the high sintering activities of ultrafine powders (56 nm). Comparing with available literature which involves oxide-dispersion-strengthened-molybdenum alloys (ODS-Mo), the freeze-dried Mo–La x Mo y O z alloys in our work possess the finest grain size (440 nm), the finest oxide particle size (mainly <5 nm), the highest hardness (495 HV 0.2 ) and high strength (1201 MPa) at 30% deformation.
研究领域:
材料科学
·
冶金学
·
纳米材料
·
粉末冶金
·
先进制造
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）