COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xiang Long,Hao Yu,Peijian Zhang,Chen Qian,Mengze Lu,Yaqin Fu
Mechanically adaptive hydrogels with switchable mechanical properties have garnered significant attention due to their potential applications in various emerging fields. However, inevitable swelling and/or shrinkage associated with mechanical property switching lead to dimensional instability and structural failure of these hydrogels. This study synthesized dimensionally stable thermal-stiffening composite hydrogels by incorporating poly( N -isopropyl acrylamide) (PNIPAM)-grafted SiO 2 hybrid nanoparticles into a hydrogel matrix. By strategically localizing the thermo-responsive unit of PNIPAM at the interface between the SiO 2 nanoparticles and hydrogel matrix, the undesired swelling and shrinkage behavior are successfully eliminated, which are typically observed in conventional thermo-responsive mechanically adaptive hydrogels. The resulting composite hydrogels exhibit significantly enhanced dimensional stability compared to conventional counterparts and demonstrate superior response speed. Upon heating to 40 °C, the PNI-SiO 2 /P(AM- co -NIPAM)-2.0 hydrogel displays a tensile modulus of 22.4 kPa, strength of 60.5 kPa, and toughness of 127.1 kJ·m −3 , which is approximately twice that of its original state (12.2 kPa, 32.5 kPa, and 70.7 kJ·m −3 ). Moreover, both heating and cooling responses are completed within approximately 10 seconds while maintaining mass and volume changes below 3 %, with water content remaining at approximately 95 %. This work presents a design strategy for developing dimensionally stable mechanically adaptive composite hydrogels, which hold great promise for applications in tissue engineering, biomedical fields, and soft robotics.
研究领域:
材料科学
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生物医学工程
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组织工程
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产品关联
DOI
高影响因子
RSC Advances
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2024
·Vol. 14
·期 43
·31868-31876
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IF 3.9
Shuai Liu,Yuzhu Xiong,Fuping Dong
The development of non-toxic drug carrier materials with high loading capacity, sustained release properties, stability, and biocompatibility holds significant medical value and potential for loading and releasing poorly soluble drugs. In this study, we synthesized a biocompatible, non-toxic, environmentally friendly CD-MOF porous material with high specific surface area and tunable structure. By incorporating SiO2 to enhance the stability of MOF materials, the synthesized CD-MOF@SiO2 material shows promising applications in drug delivery. The obtained CD-MOF@SiO2 nanocomposite was utilized as a carrier for the poorly soluble drug, folic acid. Characterization of the drug-loaded composite before and after drug loading was performed using scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, N2 adsorption–desorption, and X-ray diffraction analyses, showing improved stability as indicated by thermogravimetric analysis and derivative thermogravimetry data. UV spectrophotometry was used to investigate the loading and sustained release of folic acid under different conditions in PBS buffer, demonstrating that the well-structured CD-MOF@SiO2 material exhibits high drug loading and controllable release properties. The CD-MOF@SiO2 achieved a high drug loading efficiency (166.78%) and encapsulation rate (83.39%) for folic acid, leading to a significant increase in apparent solubility from 1.6 μg mL−1 in its free form to 21.74 mg mL−1, a 13 588-fold expansion. This work presents a novel, efficient, and highly valuable approach for the development of carrier materials for loading and releasing poorly soluble drugs.
研究领域:
药剂学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Gels
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2024
·Vol. 10
·期 12
·844
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IF 5
Lei Xu,Guanhua Sun,Jiahui Chen,Xiaoxu Wu,Min Hu,Fang Zhou,Zhi Li
This research enhances the thermal safety of hydrophobic silica aerogel (HSA) by integrating layered double oxides (LDOs). XRD and FTIR confirm that the introduction of LDOs does not affect the formation of SA. The LDO/SA composites demonstrate a low density (0.14–0.16 g/cm 3 ), low thermal conductivity (23.28–28.72 mW/(m·K)), high porosity (93.4–96.1%), and a high surface area (899.2–1006.4 m 2 /g). The TG-DSC results reveal that LDO/SA shows enhanced thermal stability, with increases of 49 °C in the decomposition onset temperature and 47.4 °C in the peak decomposition temperature. The gross calorific value of LDO/SA-15% (with 15 wt% LDO) exhibits a 23.9% reduction in comparison to that of pure SA. The decrease in gross calorific value, along with improved thermal stability, indicates a boost in the thermal safety characteristics of the LDO/SA composites. This study demonstrates that incorporating LDOs enhances the thermal safety of HSA, while preserving its superior performance, thus broadening its potential applications in thermal insulation.
研究领域:
材料科学
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热能工程
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
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2024
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IF 3.9
Mengyao Yun,Tao Chen,Ning Zhao,Zhenhua Li
Energy is of great importance for the development of modern society, which is mostly dependent on crude oil. Due to the severe pollution caused by using crude oil and the diminishing of crude oil reserves, it is urgent to look for clean oil from alternative resource other than crude oil. Currently, Coal-to-Liquid (CTL) or Biomass-to-Liquid (BTL) technology is an important way to produce clean liquid fuels through Fischer-Tropsch Synthesis (FTS) of syngas. For FTS process, catalyst is a main factor for affecting on syngas conversion and product distribution. For traditional oxides-supported catalysts, the mutual constraint between active metal loading and dispersion at high metal loading is hard to overcome, which will hinder the synthesis of high-performance FTS catalysts. In this paper, a new type of Co@SiO 2 -T (CS-T) and Co@SiO 2 -X (CS-X) catalysts with core-shell structure were prepared by using polyvinyl pyrrolidone (PVP) as the structural stabilizer, hexadecyl trimethyl ammonium Bromide (CTAB) as the templating agent and tetraethyl orthosilicate (TEOS) as the silica source. The effects of hydrothermal temperature and pyrolysis temperature on the catalyst physical-chemical properties and FTS performance were investigated. The results showed that increasing the hydrothermal temperature favored the formation of the core-shell structure of the catalysts. With the increase of pyrolysis temperature, the catalyst particle size decreased from 0.54 μm to 0.23 μm. The FTS activities of the catalysts showed a volcano trend with hydrothermal and pyrolysis temperatures.
研究领域:
能源化学
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催化科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Defu Yin,Zewei Hu,Mingya Liu,Jingyun Zhang,Hanli Zheng,Yunxi Hou,Shitao Yu,Lu Li,Shiwei Liu,Yue Liu
The highly stereoselective hydrogenation of α-pinene was very important and challenging in the utilization of natural products at mild conditions. Here, we reported a core–shell catalyst coated with Ir metal particles by mesoporous silica shell, and revealing the dependence of reducing agents during the preparation process. The prepared nano catalyst exhibited excellent performance in the hydrogenation of chiral substance α-pinene, especially under very mild conditions (40 °C, 1 MPa H 2 and 2 h), with a yield of cis -pinane reaching ∼99 %. The characterization methods revealed that the excellent performance was attributed to the strong hydrogenolysis ability of Ir particles. DFT results further indicated that α-pinene can stably adsorb on the edge sites of Ir metal in a cis structure, thereby achieving highly stereoselective hydrogenation. This work utilized heterogeneous catalysis to achieve performance close to that of homogeneous catalysts. The stable core shell structure greatly prolonged the lifespan of the catalyst and overcame the drawbacks of homogeneous catalysts. This work provided more reference cases for chiral hydrogenation.
研究领域:
催化
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材料科学
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化学工程
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有机化学
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产品关联
DOI
高影响因子
Frontiers of Materials Science
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2020
·Vol. 14
·期 2
·163-176
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IF 1.747
Zhang Zhiyu,Hu Lixia,Zhang Hui,Yu Liping,Liang Yunxiao
Novel large-sized mesoporous nanofilm-constructed macroporous SiO 2 (LMNCMS) with two sets of well-defined 3D continuous pass-through macropores (pore size of 0.5–1.0 μm, wall thickness of 40–50 nm) was prepared through a dual-templating approach, and used as an advanced support for TiO 2 nanocrystalline photocatalyst. The structural and optical properties of the as-prepared materials were investigated by various characterization techniques in order to explore the connections between catalysts’ features and catalytic performance. The photocatalytic activities were evaluated by degradations of methylene blue (MB) and phenol under the simulated sunlight irradiation. To gain insight into the impact of preparation and operation conditions on photocatalytic degradation processes, experiments were conducted at wide ranges of the TiO 2 loading content, calcination temperature, solution pH, and photocatalyst dosage. Nano-TiO 2 /LMNCMS exhibited high photocatalytic activity and stability. Rapid matter transport, good accessibility of pollutants to TiO 2 and high light harvesting could mainly account for the superior photocatalytic performance. The trapping experiments were performed to identify the main reactive species in the catalytic reactions.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Mengmeng Yang,Wei Hu,Mingling Li,Min Li,Rongbing Zhai,Qiong Wu,Zhaofeng Chen
High performance insulation ceramic materials with excellent mechanical and thermal insulation properties are urgently needed as thermal insulators in harsh environments. However, manufacturing flexible and low-thermal conductivity porous ceramic nanofiber with high thermal stability remains a major challenge. In this work, aerogel particles were used as nano pore regulator to obtain SiO 2 /aerogel composite porous nanofibers membrane with layered structure via sol-gel and electrospinning technology. The nano-porous framework of the aerogel particles and lamellar structure, contribute to reducing the thermal conductivity of the SiO 2 /aerogel composite nanofiber membrane as low as 30.81 mW/(m·K), representing a 24.6 % decrease compared to the SiO 2 nanofibers without aerogel particles. In addition, the amorphous nature of nanofiber imparts excellent mechanical properties to the composite nanofiber membrane, maintaining approximately 86 % of the original bending stress after 500 bending-recovery cycles. Furthermore, the composite nanofiber aerogel exhibits excellent flame resistance, dynamic compressive resilience under extreme temperature conditions (∼196 °C and 500 °C), exceptional high-temperature insulation, and remarkable thermal protection performance. This investigation presents a novel and effective strategy for designing lightweight, thermally resistant ceramic porous nanofibers with low thermal conductivity suitable for high-temperature environments.
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产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 2
·95
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IF 3.504
Yinghan Liu,Se Wang,Zhuang Wang,Nan Ye,Hao Fang,Degao Wang
Metal-based nanoparticles (NPs) are the most widely used engineered nanomaterials. The individual toxicities of metal-based NPs have been plentifully studied. However, the mixture toxicity of multiple NP systems (n≥ 3) remains much less understood. Herein, the toxicity of titanium dioxide (TiO2) nanoparticles (NPs), silicon dioxide (SiO2) NPs and zirconium dioxide (ZrO2) NPs to unicellular freshwater algaeScenedesmus obliquuswas investigated individually and in binary and ternary combination. Results show that the ternary combination systems of TiO2, SiO2and ZrO2NPs at a mixture concentration of 1 mg/L significantly enhanced mitochondrial membrane potential and intracellular reactive oxygen species level in the algae. Moreover, the ternary NP systems remarkably increased the activity of the antioxidant defense enzymes superoxide dismutase and catalase, together with an increase in lipid peroxidation products and small molecule metabolites. Furthermore, the observation of superficial structures ofS. obliquusrevealed obvious oxidative damage induced by the ternary mixtures. Taken together, the ternary NP systems exerted more severe oxidative stress in the algae than the individual and the binary NP systems. Thus, our findings highlight the importance of the assessment of the synergistic toxicity of multi-nanomaterial systems.Keywords:metal-oxide nanoparticles;mixture toxicity;freshwater algae;cellular response;oxidative damage
研究领域:
环境科学
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毒理学
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DOI
PubMed
高影响因子
Polymers
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2022
·Vol. 14
·期 21
·4772
·
IF 4.967
Ruizhi Wang,Nan Du,Liang Jin,Wufei Chen,Zhuangxuan Ma,Tianyu Zhang,Jie Xu,Wei Zhang,Xiaolin Wang,Ming Li
Bladder cancer and prostate cancer are the most common malignant tumors of the genitourinary system. Conventional strategies still face great challenges of high recurrence rate and severe trauma. Therefore, minimally invasive photothermal therapy (PTT) has been extensively explored to address these challenges. Herein, fluorescent Au nanoparticles (NPs) were first prepared using glutathione as template, which were then capped with SiO2shell to improve the biocompatibility. Next, Au nanoclusters were deposited on the NPs surface to obtain[email protected]2@Au NPs for photothermal conversion. The gaps between Au nanoparticles on their surface could enhance their photothermal conversion efficiency. Finally, hyaluronic acid (HA), which targets cancer cells overexpressing CD44 receptors, was attached on the NPs surface via 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) chemistry to improve the accumulation of NPs in tumor tissues. Photothermal experiments showed that NPs with an average size of 37.5 nm have a high photothermal conversion efficiency (47.6%) and excellent photostability, thus exhibiting potential application as a PTT agent. The temperature of the NPs (100 μg·mL−1) could rapidly increase to 38.5 °C within 200 s and reach the peak of 57.6 °C with the laser power density of 1.5 W·cm−2and irradiation time of 600 s. In vivo and in vitro PTT experiments showed that the NPs have high biocompatibility and excellent targeted photothermal ablation capability of cancer cells. Both bladder and prostate tumors disappeared at 15 and 18 d post-treatment with[email protected]2@Au NPs, respectively, and did not recur. In summary,[email protected]2@Au NPs can be used a powerful PTT agent for minimally invasive treatment of genitourinary tumors.Keywords:genitourinary system;bladder cancer;prostate cancer;photothermal therapy;hyaluronic acid;Au nanoparticles
研究领域:
纳米技术
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癌症研究
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Hong Du,Xiuyun Ma,Miao Jiang,Peifang Yan,Yang Zhao,Z. Conrad Zhang
The lignocellulosic biomass utilization is a feasible way to obtain alternative fuels and chemicals. Xylitol as an ideal sweetener is one of the top twelve value-added chemicals derived from biomass. Xylitol is also used in the pharmaceutical and cosmetics industries. Thus, the production of xylitol from biomass is significantly important. A silica supported nickel catalyst derived from nickel phyllosilicate for efficient aqueous phase xylose hydrogenation to xylitol was developed in this study. Higher xylose conversion was observed over the nickel phyllosilicate derived catalyst compared to nickel oxide derived nickel catalyst prepared by impregnation and commercial Raney Ni catalyst. The excellent xylitol selectivity (approximately 99 %) was also obtained over the nickel phyllosilicate derived catalyst. The differences in structure and property resulted from different preparation methods were investigated by means of XRF, N 2 physisorption, XRD, FT-IR, H 2 -TPR, TEM as well as H 2 -TPD. The higher nickel dispersion of nickel phyllosilicate derived catalysts, which could be synthesized by ammonia evaporation and deposition-precipitation using Na 2 CO 3 as precipitator, led to higher xylose conversion. In addition, the phyllosilicate derived nickel catalyst demonstrated outstanding stability. Consequently, phyllosilicate derived nickel catalyst is promising for the industrial application for the production of xylitol form xylose aqueous hydrogenation thanks to its higher activity and selectivity as well as good stability.
研究领域:
化学工程
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催化材料
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DOI
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 43
·20132-20137
·
IF 2.562
Zhijun Ma,Weibo Chen,Zhongliang Hu,Xuanzhao Pan,Guoping Dong,Shifeng Zhou,Mingying Peng,Yang Li,Chenxing Liao,Quanlan Xiao,Jianrong Qiu
TiO2-based micro/nano fibres with secondary hierarchical structure have been extensively studied concerning a wide range of applications. However, simultaneous optimization of the flexibility and thermal stability of these materials still remains a big challenge. In this investigation, the successful fabrication and characterization of TiO2–SiO2 composite micron fibers with both high flexibility and excellent thermal stability are reported. Electrospun flexible SiO2 fibers were used as the scaffold for supporting TiO2 nanostructures. Three distinguished layers of porous SiO2, anatase TiO2 nanoparticle and rutile TiO2 nanorods were muffled over the SiO2 fibers stepwise, forming a unique core@multi-shell architecture with hierarchical structure. Such elaborately designed core@multi-shell TiO2–SiO2 fibers present high flexibility, excellent thermal stability, large specific surface area and high porosity. Moreover, they are easy to be patterned into nonwoven film with hierarchically porous structure, which is promising for many applications. We evaluate the water purification performance of the TiO2–SiO2 nonwoven film with Rhodamine B as a model organic pollutant. Efficient removal of Rhodamine B from water was implemented via simple filtration under UV irradiation, and regeneration of the photocatalytic functionality of the film from organic contamination was conveniently realized merely through calcination.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Hui Xu,Yan Chen,Nannan Liu,Xinglong Chen,Dan Wu,Binshan Ju,Minglu Shao
The foam instability is still a question to enhance oil recovery. In this work, the modification process of the SiO 2 nanoparticles by kH-570 was described and the models of SDS and SiO 2 nanoparticles at the gas–liquid interface established were aimed to verify the mechanism of SiO 2 nanoparticles on foam stability. The results showed that the foam performance of the hydrophilic SiO 2 /SDS dispersion was better than that of SiO 2 /SDS dispersion depending on desorption energy and maximum capillary pressure of SiO 2 nanoparticles at the gas–liquid interface. Finally, the oil recovery (45.25%) by using hydrophilic SiO 2 /SDS dispersion at 2.0% modified SiO 2 + 0.4% SDS.
研究领域:
石油工程
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）