CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Xiaoyang Yu,Fan Li,Xuyang Miao,Ning Jiang,Ruowen Zong,Shouxiang Lu,Changhai Li
The presence of ethanol has an adverse effect on foam spreading, and ethanol fire is difficult to extinguish with aqueous fire-fighting foams. Thus, it is necessary to explore the foam formulation suitable for ethanol fuels and study the spreading behavior of foam over ethanol surface. In the current work, stable foams based on hydrocarbon surfactant (SDS), fluorocarbon surfactant (FC1157), and polymers (XG) were prepared by using the compressed-air foam system. The spreading behaviors of foam on polar ethanol and non-polar heptane surface were observed and compared. Furthermore, the effects of stabilizer concentrations, foam flow rates and expansion ratios on foam spreading performance were investigated, respectively. The results indicate that aqueous SDS foam can spread on the heptane layer continuously, but it is difficult to cover the ethanol surface. The addition of XG and FC1157 can synergistically improve the spreading performance of aqueous foam over ethanol. Depending on stabilizer concentrations, there are remarkable differences in foam spreading behaviors. Besides, different foam application parameters including expansion ratios and foam flow rates significantly affect the foam spreading rate, despite the same foam formulation. The research methods and results guide the optimal design of foam formulations as well as the practical application of aqueous foam for ethanol fire extinguishment.
研究领域:
化学工程
·
消防科学
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DOI
高影响因子
Energy & Environmental Materials
·
2022
·
IF 13.443
Jinmeng Li,Tian Xu,Zheng Ma,Wang Li,Yongxin Qian,Yang Tao,Yinchao Wei,Qinghui Jiang,Yubo Luo,Junyou Yang
Thermoelectric power generators have attracted increasing interest in recent years owing to their great potential in wearable electronics power supply. It is noted that thermoelectric power generators are easy to damage in the dynamic service process, resulting in the formation of microcracks and performance degradation. Herein, we prepare a new hybrid hydrogel thermoelectric material PAAc/XG/Bi 2 Se 0.3 Te 2.7 by an in situ polymerization method, which shows a high stretchable and self-healable performance, as well as a good thermoelectric performance. For the sample with Bi 2 Se 0.3 Te 2.7 content of 1.5 wt% (i.e., PAAc/XG/Bi 2 Se 0.3 Te 2.7 (1.5 wt%)), which has a room temperature Seebeck coefficient of −0.45 mV K −1 , and exhibits an open-circuit voltage of −17.91 mV and output power of 38.1 nW at a temperature difference of 40 K. After being completely cut off, the hybrid thermoelectric hydrogel automatically recovers its electrical characteristics within a response time of 2.0 s, and the healed hydrogel remains more than 99% of its initial power output. Such stretchable and self-healable hybrid hydrogel thermoelectric materials show promising potential for application in dynamic service conditions, such as wearable electronics.
研究领域:
材料科学
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能源技术
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生物医学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Meixia Zheng,Meichun Chen,Rongfeng Xiao,Jianwen Feng,Hailan Su,Fengfang Lin,Jianfu Chen,Kok Bing Tan,Yujing Zhu
Colletotrichum gloeosporioides , the primary fungal pathogen responsible for mango anthracnose, causes significant economic losses. Hence, we developed a xanthan gum/hydroxypropyl methylcellulose (XG/HPMC) film incorporating Dictyophora echinovolvata carbon quantum dots (DE-CQDs). These green-synthesized DE-CQDs are 2 nm spherical nanoparticles with good crystallinity and thermal stability, featuring functional groups such as -OH, -COOH, -NH₄ + , and -SO₃H, which enhance hydrophilicity, solubility, and charge properties. The negative charge of DE-CQDs, as evidenced by zeta potential measurements, enhances their dispersibility and inhibits aggregation, thereby contributing to the film's augmented UV-blocking and water vapor transmission characteristics. DE-CQDs inhibit C. gloeosporioides growth through a unique mechanism, inducing metacaspase-dependent apoptosis and causing ROS accumulation without DNA fragmentation. When incorporated into the XHC film, DE-CQDs improve UV-blocking by 30 % at 400 nm, enhance water vapor transmission, and increase water contact angle. The XHC film significantly reduces mango decay (decay index: 0.35 ± 0.05 to 0.21 ± 0.05) and boosts vitamin C retention (from 30 % to 61 % over 7 days), effectively extending shelf life and preserving nutritional quality. Among the XHC films, XHC6 shows the best overall performance. Thus, DE-CQDs serve as functional fillers in biodegradable, environmentally friendly packaging films, offering a novel solution for mango disease prevention and control.
研究领域:
食品科学
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植物病理学
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材料科学
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产品关联
DOI
PubMed
高影响因子
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY
·
2025
·
IF 1.9
Shuhan Yang,Shouqi Zhao,Yingying Ning,Dan Zhao
Previous studies have shown that co-culture methods can enhance exopolysaccharide production, no studies have reported this enhancement in co-cultures between Weissella confusa and Candida shehatae. This study developed an efficient co-culture system combining W. confusa XG-3 and C. shehatae (1:1 ratio), and employed response surface methodology to optimize both exopolysaccharide yield and properties. The initial co-culture produced 56.82 ± 0.12 g/L exopolysaccharide, a 1.63-fold increase over single culture. Optimization (sucrose: 105.97 g/L; yeast extract: 5.81 g/L; peptone: 6.24 g/L) further increased the yield to 115.66 g/L, a 2.04-fold improvement. The co-cultured exopolysaccharide had high water solubility (60.45 ± 0.70%) and water holding capacity (614.74 ± 9.26%). The co-cultured EPS showed significant antioxidant activity. At 5 mg/mL, the scavenging rates of ABTS, DPPH, hydroxyl, superoxide, H2O2 and total reducing power reached the highest 52.22 ± 0.47%, 50.79 ± 2.86%, 55.80 ± 2.56%, 36.05 ± 2.07%, 66.85 ± 0.30%, and 0.39 ± 0.01. It also had a superior effect on the proliferation of several probiotics compared with commercial prebiotics and exhibited high thermostability with a degradation threshold at 292.5 °C. These results demonstrate a novel, scalable strategy for producing multifunctional EPS with broad applications in the food industry.
研究领域:
微生物学
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食品科学
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生物技术
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Yilan An,Shiping Cheng,Qiaoling Ding,Dongbo Guan,Yi Hu,Yanli Dou
Flexible sensors are essential for human-machine interfaces and bioinspired intelligent robotics, yet achieving a balance between mechanical robustness and high sensitivity at lower temperatures remains a challenge. Herein, a multifunctional hydrogel sensor (PG 2 /Ag-MOFs-XG) was fabricated through physical crosslinking of polyvinyl alcohol (PVA) and xanthan gum (XG) in glycerol (Gly) and deionized water mixture via freeze-thaw circulation and NaCl crosslinking. The in situ growth of Ag-MOFs on XG molecular chains is facilitated by the electrostatic interactions between the hydroxyl groups and the carboxyl groups of XG and Ag + , restricting molecular chain movement, thereby enhancing comprehensive properties. The PG 2 /Ag-MOFs-XG hydrogel exhibits outstanding mechanical properties across a broad temperature range, with a 101 % increase in tensile strength (from 0.583 MPa to 1.17 MPa) at 25 °C and a 112 % increase (from 0.352 MPa to 0.746 MPa) at −18 °C, compared to the pure PVA hydrogel. Additionally, it demonstrates exceptional sensitivity to stretching (GF = 3.65) and compression (S = 3.38 × 10 −2 kPa −1 ). Furthermore, the hydrogel functions as a flexible sensor for monitoring human motion, assessing industrial robot performance, and detecting the tightness of robotic components. This work offers valuable insights into the development of portable, highly sensitive, and flexible sensors for intelligent robotics.
研究领域:
材料科学
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纳米技术
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机器人学
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传感器
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高分子科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
YuYing Han,Hui Ma,Meng Zhang,Xiaoji Zhu,Hongfu Zhou,Aimin Xiang,Xiaoling Zang
To tackle dye-related water pollution, developing cost-effective adsorbents with high efficiency in removing residual dyes from wastewater is of vital importance. Herein, magnetic composite hydrogels designed for dye adsorption and recyclability is synthesized by combining polyvinyl alcohol (PVA), xanthan gum (XG), and iron (II, III) oxide (Fe 3 O 4 ) magnetic nanoparticles. The PVA/XG hydrogel matrix is fabricated via freeze–thaw technique, and the Fe 3 O 4 nanoparticles are generated in situ within the hydrogel network. The structural and functional characteristics of the PVA/XG/Fe 3 O 4 magnetic hydrogels are systematically investigated using swelling behavior, turbulence stability, thermogravimetric analysis, and scanning electron microscopy. The impacts of adsorbent dosage, initial concentration, and solution pH on adsorption properties are comprehensively evaluated. Furthermore, the adsorption mechanisms of congo red (CR) and methylene blue (MB) onto the hydrogel are elucidated via kinetics studies, isotherm modeling, thermodynamic analyses, and Fourier transform infrared characterization. The Langmuir adsorption isotherm models predicted maximum adsorption capacities of 364.70 and 409.19 mg g −1 for MB and CR, respectively. A novel PVA/XG/Fe 3 O 4 magnetic hydrogel is developed that addresses a critical challenge in water treatment: the cumbersome recovery of adsorbents. By integrating rapid magnetic separability with high adsorption capacity, this material provides an innovative and sustainable solution for environmental remediation.
研究领域:
环境科学
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材料科学
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水处理
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纳米复合材料
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吸附技术
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DOI
高影响因子
Minerals
·
2026
·Vol. 16
·期 9
·910
·
IF 2.7
Zhili Li,Zongyu Zheng,Dongsheng He,Guilan Liu,Hua Liu,Wei Xu,Yun Tang,Hongsheng Shao,Lianjun Shi,Yuan Tang,Yanhong Fu,Wanqing Li
The separation of ultrafine apatite from quartz through reverse flotation is a challenge due to its low mass and high specific surface area. In this work, xanthan gum–Fe3+(XG–Fe3+) was explored as a novel and efficient depressant–flocculant for the selective flotation separation of apatite and quartz. The flotation performance and separation selectivity of XG–Fe3+were systematically assessed using micro-flotation tests. The mechanisms were revealed through turbidity analysis, microscopic observation, contact angle measurement, zeta potential, and Fourier Transform Infrared Spectroscopy (FTIR) analysis. Flotation results illustrated that XG-Fe3+strongly depressed the flotation of apatite, while it hardly affected the flotation of quartz. Turbidity analysis and microscopic observation indicated the flocculation of fine apatite in the presence of XG-Fe3+, while no flocculation was found for quartz. Contact angle, zeta potential and FTIR results indicated that XG-Fe3+was chemically adsorbed onto the apatite surface, hindering the adsorption of dodecylamine (DDA) and maintaining the hydrophilicity of apatite. XG-Fe3+enhanced the flotation separation of ultrafine apatite from quartz by maintaining the hydrophilicity of ultrafine apatite while simultaneously reducing its entrainment into the froth via selective flocculation.
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DOI
高影响因子
Journal of Water Process Engineering
·
2026
·
IF 6.6
Kaipian Shi,Junfeng An,Yu Yin,Li Yin,Ziyu Rong,Jinyu Han,Shiyin Li
A stable XG-WAS@n-FeS slurry was constructed for simultaneous removal of Cr(VI) and TBBPA. • Xanthan gum enhanced slurry viscosity, stability, and oxidation resistance. • TBBPA was transformed through successive debromination reactions. • Coexisting contaminants influenced TBBPA removal through site competition. Nanoscale ferrous sulfide (n-FeS) is a promising reductant for water treatment, but rapid oxidation, particle aggregation, and poor transportability restrict its practical use. In this study, n-FeS was immobilized on alkali-modified waste activated sludge (WAS), and xanthan gum (XG) was added as a structural regulator. This approach produced a stable, shear-thinning XG-WAS@n-FeS slurry for the simultaneous removal of Cr(VI) and tetrabromobisphenol A (TBBPA). Carboxyl and hydroxyl groups contributed to the binding of FeS within the XG-WAS matrix, which helped establish a stable reactive interface. The slurry exhibited lower viscosity at higher shear rates, confirming its shear-thinning behavior. Increasing the XG concentration also improved sedimentation stability and oxidation resistance. Cr(VI) was completely removed at all tested concentrations. By contrast, TBBPA removal decreased from 81.93% to 53.19% as the Cr(VI) concentration increased from 20 to 80 mg L −1 . It also decreased from 92.49% to 58.99% when the TBBPA concentration increased from 5 to 20 μM. These concentration-dependent trends reflect the finite reducing capacity of the slurry and the preferential consumption of electrons by Cr(VI). Humic acid, Ca 2+ , Mg 2+ , and Cl − enhanced TBBPA removal to varying degrees, while Cr(VI) removal remained complete. XPS analysis showed that Cr(VI) was reduced and immobilized as Cr(III) species. HPLC-MS analysis revealed the stepwise debromination of TBBPA to BPA. These findings demonstrate that XG-WAS@n-FeS is a stable and effective slurry for treating water containing both Cr(VI) and TBBPA. Download: Download high-res image (190KB) Download: Download full-size image
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Hui Ren,Shun-Zhi Zhou,Tian Yu,Meng Jin,Jia-Rong Chen,Bin Wu,Zhong-Xiang Tang,Ning Ma,Fang-Chang Tsai
Traditional flame-retardant methods for wood, which employ organic reagents and halogens, are detrimental to human health and the environment. Therefore, a PVA (Polyvinyl alcohol)-based coating (PX-AP) incorporating xanthan gum (XG), phytic acid (PA), and aluminum phosphate (AP) was developed to enhance flame retardancy, antibacterial performance, and thermal insulation of wood. XG improves viscosity, stabilizes AP suspension, facilitates carbon formation, and collaborates with AP to form a dense char layer. PX-AP achieves UL-94 V-0 rating with LOI > 60%; TGA results show residual carbon content increases by 102.8% compared to natural wood; cone calorimeter tests indicate Total heat release (THR) decreases by 36.9% and Peak heat release rate (pHRR) by 43.7%; and the maximum backside combustion temperature drops by 44.1% in thermal insulation tests. Bio-inorganic carbon armor enhances fire-resistance & structural integrity of wood for safer evacuation. It also exhibits strong adhesion, meeting diversified demands for wood applications.
研究领域:
材料科学
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高分子化学
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纳米复合材料
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防火工程
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绿色化学
·
木材科学
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热防护
·
生物基材料
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产品关联
DOI
高影响因子
Molecular Medicine Reports
·
2015
·Vol. 11
·期 6
·4671-4677
·
IF 1.554
Qigen Du,Guang Xin,Hai Niu,Wen Huang
The 4[(Tetrahydro‑2H‑pyran‑2‑yl) oxy] phenol (XG‑d) hydroquinone analog, is found in Vaccinium vitis‑idaea L. Although it is known for its antioxidant properties and high level of safety, its antitumor activity remains to be elucidated. In the present study, the anticancer effect of XG‑d was determined in vitro and in vivo. The cytotoxicity of XG‑d against C26 murine colon carcinoma cells was found to occur in a time‑ and concentration‑dependent manner, whereas little effect was observed in the two normal cell lines (HK‑2 and L02) investigated. Oral administration of XG‑d (100 mg/kg) had effects on the tumor growth of tumor‑bearing mice. Furthermore, marked apoptosis was observed using Hoechst 33258 staining and flow cytometric analysis with annexin V/propidium iodide double staining. XG‑d also downregulated the expression of B‑cell lymphoma 2 (Bcl‑2), increased the expression levels of Bcl‑2‑associated X protein and activated caspase‑9, caspase‑3 and poly(adenosine diphosphate‑ribose) polymerase. The present study demonstrated for the first time, to the best of our knowledge, that XG‑d inhibited cancer cell growth via the induction of apoptosis and was also able to inhibit tumor growth in vivo. These results demonstrated that XG‑d may be used as a potential natural agent for cancer therapy with low toxicity.
研究领域:
肿瘤学
·
药理学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Yuanxing Yue,Yongsheng Sun,Xiaolong Zhang,Jianping Jin,Yanjun Li
Traditional separation of barite, specularite, and quartz relies mainly on magnetic and gravity-based methods. In this study, a composite depressant, XG-SS (xanthan gum/sodium silicate), was introduced for the first time for the selective flotation separation of this mineral system. Under optimal conditions (pH 9, with NaOL and XG-SS dosages of 20 mg/L), a floatability difference of 83.89 percentage points among the three minerals was achieved. Open-circuit flotation tests on actual ore further produced a high-quality barite concentrate with a BaSO 4 grade of 95.68%. The separation mechanism was elucidated using contact angle measurements, zeta potential analysis, FTIR, and XPS. The results show that the depressive effect of XG-SS on barite is weaker than the collecting ability of NaOL, whereas XG-SS strongly suppresses specularite through hydrogen bonding and chemisorption associated with hydroxylated Fe(III) surface sites (Fe-OH/FeOOH-like species). In contrast, only weak physical adsorption occurs on quartz. Density functional theory calculations further identify the hydroxyl and carboxyl groups in xanthan gum as the primary active sites, with Mulliken charge and frontier molecular orbital analyses confirming their strong nucleophilicity and high reactivity. Based on these findings, a mechanistic model for the selective flotation separation of barite, specularite, and quartz in the NaOL-XG-SS system is proposed.
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高影响因子
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