POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2025
·
IF 6.8
Hua Huang,Jiaying Yu
The cuticle layer covering the surface of the fruit acts as a crucial barrier to regulate water loss and preserve the texture. This study comprehensively investigated the morphological characteristics, cutin matrix depolymerization, and wax content and their effects on transpiration in Chinese olive fruit. Microscopic examination revealed that the surface of the fruit had fissured wax layers, sparse lenticels, and a delicate cuticle covering the epidermal cells. We developed a simple and efficient powder extraction method to decompose cutin polymers, especially from partially depolymerized cutin matrices and epidermal peels, from which cuticular membranes cannot be isolated. The analysis revealed a cutin monomer content of approximately 4.85 g m −2 , predominantly comprising C16–9/10,16-dihydroxy fatty acids (51.4 %) and phenols (19.5 %). The fruit waxes (8.11 g m −2 ) were predominantly composed of pentacyclic triterpenoids, constituting approximately 88 %, with a small amount of very-long-chain aliphatic compounds. The water loss rate from Chinese olive fruit was 4.75 × 10 −3 g m −2 s −1 , resulting in a permeability of 19.6 × 10 −5 m s −1 , which is higher than that reported for many other fruit. The reduced efficiency of the transpiration barrier may largely be attributed to the chemical composition and spatial arrangement of the cuticle. The findings of this study provide a basis for mitigating the dehydration process and developing appropriate preservation strategies for Chinese olive fruit.
研究领域:
植物生理学
·
园艺学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 23
·14456-14466
·
IF 4.036
Yang Liu,Chengxuan Wu,Xiaofang Lv,Xinyi Xu,Qianli Ma,Jiawei Meng,Shidong Zhou,Bohui Shi,Shangfei Song,Jing Gong
In the exploitation of deep-sea oil and gas resources, the multiphase production and transportation process is frequently plagued by pipeline blockage issues. Especially when hydrates and wax coexist simultaneously, the viscosity and plugging tendency of multiphase flow systems will synergistically increase. Understanding the evolution of morphology of hydrate particles and the agglomeration characteristics of hydrate particles in the presence or absence of wax crystals is crucial to flow assurance industry. With the assistance of a visualized reactor equipped with a three axis moving platform, microscopic images of cyclopentane hydrate during hydrate growth were obtained, and the cohesive force between hydrate particles was measured. It was found that during the hydrate growth on wax-free water droplets, the untransformed water inside the particles gradually wetted the surface of the particle. With the increase in temperature and contact time, the shell of hydrate particles changed from solid and rough to smooth and moist. The cohesive force measured in this work ranges from 3.14 ± 0.52 to 11.77 ± 0.68 mN m−1 with different contact times and temperature. When the contact time was 0 s and 10 s, the cohesive force between particles increased first and then stabilized with temperature. When the contact time was 20 s, the cohesive force was greater than the first two cases and showed an overall stable trend. An interesting phenomenon was also discerned: a large water bridge between particles formed during their separation process. For the wax-containing system, it required a longer time for water droplets to be converted into hydrate particles than that for wax-free systems. After wax participated in hydrate growth, hydrate particles showed the properties of elasticity and stickiness, which resulted in a larger liquid bridge between hydrate particles after their contact. It was suggested that wax crystal would alter the shell structure of hydrate particles, and change the surface properties of hydrate particles and the formation process of the liquid bridge, leading to significant and rapid increase in the cohesive force.
研究领域:
流变学
·
海洋油气开发
·
胶体与界面科学
·
能源工程
·
流动保障
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Xinghua Wu,Jiaxing Tang,Zhanlang Ye,Zhenghui He,Junxi Liang,Rui Yan,Jun Hu,Shunli Zheng
In this study, we demonstrated a multi-layer fluorine-free superhydrophobic coating with anti-condensation and anti-biofouling properties. Polyethylene terephthalate was introduced to fix the candle soot layers. The coating exhibits exceptional superhydrophobicity due to the formation of nanocarbon chains resulting from incomplete combustion of the candle. The obtained superhydrophobic coatings exhibited enhanced anti-condensation and anti-algae properties. The coatings presented suppressed the nucleation and growth of condensates at a subcooled temperature of 8 °C. To examine the anti-biofouling property of the surface, the as-prepared samples were submerged in impurity water for 7 days. The Scenedesmus obliquus failed to adhere and proliferate on the coating surface during the 7-day continuous immersion. The developed coating holds promise to provide a low cost, high-throughput, faster way to develop function coatings for industry applications.
研究领域:
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yueyue Yang,Liangyun Xu,Qi Zhang,Yihui Wang,Aiquan Jiao,Zhengyu Jin
In this study, a novel pea protein (PP)-based bigel was developed, featuring a high internal phase emulsion. The impact of gelling agent concentration on the gel properties and freeze-thaw stability of the bigel was investigated. The bigel was comprised of two distinct gel phases: an aqueous-phase gel with a covalent network formed by PP and transglutaminase (TGase), and an oil-phase gel with a crystal network structure of rice bran wax (RBW). Microstructural analysis revealed a bi-continuous network structure in the bigel, with network density increasing as TGase and RBW concentrations rose. Rheological analysis showed that storage modulus (G′), apparent viscosity, and structural recovery of the bigel increased with higher TGase and RBW concentrations. Temperature scanning experiments confirmed that the bigel maintained its elastic solid behavior even at elevated temperatures. Optimal sensory properties and low coefficient of friction were achieved at 0.4 % TGase and 7 % RBW concentrations. Additionally, the bigel exhibited notable freeze-thaw stability at TGase and RBW concentrations exceeding 0.2 % and 5 %, respectively. These findings highlight the excellent gelation properties and stability of the PP-RBW-based bigel, suggesting its potential as a fat substitute in the food industry.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2025
·
IF 6.8
Hua Huang,Genlin Mao,Dongjie Liu,Shenghua Ding
The cuticle layer covering on surface plays important roles in the quality changes including visual of appearance, texture, and water loss for fruit. The surface microstructures, chemical composition of epi- and intracuticular waxes, and cutin monomers, as well as their effects on fruit transpiration in Sanhua plum were comprehensively carried out. Microscopic observation revealed an irregular surface morphology characterized by continuous crusts interspersed with sparsely distributed nano-granular crystals. Chemical analysis demonstrated that the epicuticular waxes were primarily composed of very-long-chain n -alkanes, secondary alcohols, aldehydes, fatty acids, primary alcohols, and alkyl esters. The intracuticular waxes contained comparable levels of very-long-chain components and pentacyclic triterpenoids. The cutin monomers were predominantly C 16 -dihydroxy fatty acids, and other hydroxyl fatty acid derivatives, present with a moderate level as other reported Rosaceae family fruit. Compared to cutin polymers, the cuticular waxes contributed approximately 76.9 % of the total barrier to water loss, with the epicuticular wax layer exhibiting 1.6-fold to the intracuticular wax layer for the barrier efficiency in Sanhua plum fruit. The elucidation of the potential effect of surface lipids on transpiration was likely associated with the structural and chemical distribution of cuticular wax layers within the cuticle.
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2021
·Vol. 14
·期 24
·8243
·
IF 3.004
Xinyuan Li,Shu Lu,Meifei Niu,Ruzhen Cheng,Yanjun Gong,Jun Xu
A high content of asphaltene and wax in crude oil leads to difficulties in the recovery and transportation of crude oil due to the precipitation of asphaltenes and the deposition of waxes. Comb-like polymers were found to be capable of inhibiting the aggregation of asphaltenes and crystallization of waxes. In this work, comb-like bipolymers of α-olefins/ultra-long chain (C18, C22 and C28) alkyl acrylate were synthesized and characterized by FT-IR and1H NMR spectra. The results show that, for a model oil containing asphaltene, the initial precipitation point (IPP) of asphaltene was prolonged by UV, and the asphaltene particle size was reduced after adding the biopolymers, as revealed by dynamitic light scattering (DLS). The bipolymer containing the longer alkyl chain had a better asphaltene inhibition effect. However, DSC and rheological results show that the wax appearance temperature (WAT) of the typical high asphaltene and high wax content of crude oil was obviously reduced by adding bipolymers with shorter alkyl chains. The bipolymer (TDA2024-22) with a mediate alkyl chain (C22) reduced the viscosity and thixotropy of the crude oil by a much larger margin than others. Compared with the previously synthesized bipolymer with phenyl pendant (PDV-A-18), TDA2024-22 exhibited a better performance. Therefore, bipolymers with appropriate alkyl side chains can act as not only the asphaltene inhibitors but also wax inhibitors for high asphaltene and wax content of crude oil, which has great potential applications in the oil fields.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2024
·
IF 2.8
Bingbing Qian,Yaodong Dai,Lingfei Xin,Chuqing Yao,Guohui Wang,Shuquan Chang
It is well known that the properties of polyethylene can be improved by irradiation-induced crosslinking the formation of three-dimensional network structures. This paper investigated the effects of gamma irradiation on the mechanical, thermal stability, and γ-rays shielding properties of TAIC-containing γ-rays shielding composites (HDPE/WC-PEW/TAIC). As a result, SEM images showed that agglomerations are alleviated after polyethylene wax (PEW) coated tungsten carbide (WC). The tensile strength and hardness increased from 25.39 MPa to 94 HA to 29.49 MPa and 98 HA after 50 kGy irradiation in vacuum as compared with all composites, while the thermal stability was also improved. The XPS and gel content results showed that the more crosslinked structures generated after 50 kGy irradiated in vacuum between high-density polyethylene (HDPE) and PEW, but irradiation in air is accompanied by the destruction of polymer skeleton. Moreover, the shielding rates of HDPE/WC-PEW/TAIC with thickness of 2 mm and containing 50 wt% WC can exceed 50% and 25% for 137 Cs and 60 Co sources respectively. In summary, HDPE/WC-PEW/TAIC could be an alternative to lead as γ-rays shielding material with excellent mechanical, thermal, and γ-rays shielding properties after 50 kGy irradiation in vacuum.
研究领域:
材料科学
·
辐射物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yongqiang Wang,Chengkai Pu,Yu Luan,Enfa Fu,Jiayi Du,Zhenggang Xiao
With the increasing requirements of tank guns for higher muzzle velocity and faster firing rate, some high energetic additives, such as cyclotrimethylene trinitramine (RDX) and cyclotetramethylene tetranitramine (HMX), have been widely used in high energy gun propellants. Consequently, the gun barrel erosion induced by the burning of high energy gun propellants has been an important issue that affects the lifespan of gun barrels. In order to address this problem, erosion reducing additives, including TiO 2 , paraffin, polyurethane or a combination of these, were introduced into the gun propellant or propellant charge system to alleviate the gun barrel erosion. In this study, a novel organic-inorganic phase change composite paraffin/ZIF-67 with solid paraffin (SP) as the phase change component and zeolitic imidazolate framework-67 (ZIF-67) as the matrix was designed and prepared as anti-erosion additives. The designed composite has a high thermal storage capacity of 93.88 J/g when the ZIF-67 content is 5 wt%. The erosion reducing effect of paraffin/ZIF-67 was determined by erosion tube test. The results show that the introduction of paraffin/ZIF-67 can improve the erosion-reducing efficiency of gun propellants. Compared with the control sample, the erosion-reducing efficiency of paraffin/ZIF-67 exhibited a faster increase with the increase of their contents, having the maximum erosion-reducing efficiency of 39.2 % when the addition of paraffin/ZIF-67 is 3.2 wt%. The incorporation of paraffin/ZIF-67 in the composites has a cooperative effect of each component on reducing gun barrel erosion. The developed organic-inorganic phase change composites exhibit great potential in the application of reducing gun barrel erosion, providing a new way for the development of erosion reducing additives.
研究领域:
材料科学
·
武器工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Kang Yang,Chao Duan,Ruoteng Ma,Xiaoshuang Liu,Zixuan Meng,Zengyin Xie,Yonghao Ni
Phase change fibers (PCFs), incorporating with diverse phase change materials (PCMs) such as paraffin wax (PW), have been recognized as one of the effective strategies for fabricate smart thermoregulatory textiles. However, some fatal defects exist in traditional paraffin-cellulose-based PCFs, including the paraffin leakage and the low fiber strength. In this work, we herein propose a facile method to prepare uniform and stable paraffin emulsions stabilized by cellulose nanofibrils (CNFs), followed by a simple coaxial wet spinning to develop smart and robust cellulose-based PCFs for human body temperature management. Benefiting from the CNF-reinforced encapsulation, the stability of paraffin capsules and the compatibility of cellulose and paraffin are indeed promoted, thus allowing the cellulose-based PCF with excellent mechanical strength, leakage prevention, and thermal regulation. As a result, the as-prepared PCF, namely CNF 1 -PE/PW with optimal 1 wt% CNF 1 loading, features a high tensile stress of 10.95 MPa at a strain of 111.2 % and a phase-change enthalpy value of 140.24 J/g with a slight paraffin leakage rate of 0.9 %. Moreover, the corresponding wearable fabric exhibits an excellent thermal storage and release recyclability even after 50 cycles. Therefore, this study provides a new idea for the development of intelligent cellulose-based phase change fiber materials.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Yizhe Lv,Yaoning Sun,Chunming Deng,Xiujuan Fan,Shuangjian Li,Chao Wang,Yaqi Yang,Yuhang Zhang,Chunyan He
Reliable and long-lasting self-lubricating, wear-resistant, and corrosion-resistant ceramic-based coatings are vital for combating coupling damage in marine environments. However, the lack of understanding of marine protective coatings' damage mechanisms has hindered the development of design theories. Therefore, the development of integrated coating preparation techniques and corrosion-wear evolution research are urgently needed. This study introduces carnauba wax into thermally sprayed ceramic coatings via vacuum-hot impregnation, creating a composite coating that exhibits corrosion resistance, wear resistance, and lubrication. Analyzing the electrochemical and tribological performance tests of the composite coatings under various corrosion cycles aims to investigate the protective effect of the coatings and the corrosion/friction evolution patterns. The results indicate that carnauba wax seals micro-nano defects of the coating. Simultaneously, carnauba wax within the coating defects imparts hydrophobic properties (>112°), decreasing seawater interaction with the coating surface. Over a 70-day corrosion testing period, the polarization resistance ( R p ) of the coating reached 2.42 × 10 7 Ω·cm 2 , indicating excellent corrosion resistance. A well-covered lubricating film composed of Al 2 O 3 , ZrO 2 , and carnauba wax was formed in the wear area, with carnauba wax providing a low friction coefficient (<0.2), while nano Al 2 O 3 and ZrO 2 enhance the load-bearing capacity of the lubricating film. Throughout the full corrosion cycle, the coating demonstrates stable and excellent lubricating wear resistance; the wear rate is only 8.58 × 10 −7 mm 3 ∙N −1 ∙m −1 . This research offers new protective strategies for components in marine environments while exploring long-term corrosion-wear evolution of coatings.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Siyu Liu,Zhongzheng Zhu,Qitan Zheng,Kaifeng Wang,Feng Zhou,Qiuming Yang,Xinyi Wang,Lu Ye,Yujie Chen,Hezhou Liu,Hua Li
Superhydrophobic surfaces (SHSs), as one of the most promising passive anti-icing materials, suffer from unavoidable icing under high-humidity cool environment. Photothermal de-icing capability with robust light absorption feature is thereby necessitated to integrate into SHSs to ensure maximum icephobic performance. Herein, a facile strategy of using polyurethane and synthesized waxberry-liked Co 3 O 4 nanoparticles (WCNPs) to construct hierarchical micro-nanostructured composites exhibiting superhydrophobic, photothermal and “light-trapping” properties is proposed. WCNPs self-assemble from nanoscale spheres, inherently possessing a hierarchical micro-nano structure. Sophisticated surface structure created by abundant WCNPs with unique intrinsic hierarchical morphology provides the composites with both excellent water repellency and impressive “light-trapping” capability of 92.7 % light absorptivity. Besides, WCNPs are covered by self-polymerized tannic acid layer interconnected with octadecylamine, which further facilitates the hydrophobic properties. In high-humidity (95 %) environments at −10 ℃, ice delay time can be enhanced to 802 s, while the melting time under 1 sun irradiation for ice crystal and layer are only 156 s and 370 s, respectively. Furthermore, reliabilities of the coating are verified by comprehensive durability assessments, including wear resistance, adhesion and icing/deicing cycle tests. This study constructs a surface micro-nano layer structure to absorb the abundant solar energy in nature and transform it into heat, providing a promising solution in anti-icing and de-icing fields.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Hao Zhang,Shengtai Zhou,Liwei Yan,Mei Liang,Huawei Zou
This study relies on the high ablation resistance strategy of char layer expansion ceramization to strengthen the char layer and improve ablation performance. The use of phase change material, that is, paraffin wax, was effective in simultaneously improving the ablation resistance and thermal insulation performance of liquid methyl vinyl silicone rubber (LMVSR) composites, which was attributed to the low density, enhanced char layer, and improved heat-absorption capacity. The introduction of paraffin wax lowered the ablation temperature and increased the specific heat capacity of LVMSR-based composites, thereby enhancing heat dissipation and reducing thermal erosion. In addition, paraffin wax was able to promote the ceramization reaction. The mass erosion rate, pyrolysis rate, and graphitization degree of the char layer were significantly improved when the content of paraffin wax was increased from 5 to 15 phr. The composites with 15 phr paraffin wax demonstrated the best performance and the highest modification effect. The paraffin modification was effective in reducing the mass ablation rate, especially at 10 phr, which showed a decrease of 34.43% when compared with that of the L-P0 counterpart. The maximum back-face temperature was reduced by 29.63% upon adding 15 phr paraffin wax when compared with L-P0, exhibiting excellent thermal insulation performance. The above results showed that the ablative resistance, internal erosion resistance, and thermal insulation properties of silicone rubber-based composites were significantly improved by using the strategy of expansion ceramization and enhanced heat absorption/dissipation by adding phase change materials, which shows potential application in preparing flexible thermal ablative material for thermal protection purposes.
研究领域:
材料科学
·
聚合物复合材料
·
热防护系统
·
烧蚀材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）