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China Petroleum Processing & Petrochemical Technology 2024年第2期26卷 98-107页

作者： Li Hongzhen Li Shengbin Feng Zhuangzhuang Jiang Mengmeng Li Ning Dong Fuqiang Shandong Yimeng Traffic Development Group Co. Ltd.Zibo 276004China College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China

In this study,the regenerative effects of different regenerants on aged SBS-modified asphalt from different perspectives were investigated,including their conventional properties,viscoelastic behavior,creep-related properties,and *** oils composed of different proportions of aromatic and saturated hydrocarbons as well as the styrene-butadiene-styrene(SBS)restorer were used to prepare the *** results showed that the components of the base oil of the regenerant played a crucial role in determining the characteristics and performance of the recycled SBSmodified *** containing a high proportion of aromatics dissolved the hard segment in the SBS restorer,thereby delaying the effect of a reduction in the regenerants on the performance of the aged asphalts at a high *** containing a high proportion of saturates dissolved the soft segment in the SBS restorer to enhance the lowtemperature performance of the recycled *** addition,the stress sensitivity of the recycled asphalts increased with the fraction of aromatics in the *** the aromatic content of the base oil components of the regenerants increased and their saturate content decreased,the state of dispersion of the SBS phase in the recycled SBS-modified asphalts *** optimal content of aromatics in the base oil of the regenerants should be set in the range of 33%to 47%to ensure the adequate performance of the recycled asphalts and a high efficiency of the SBS restorer.

关键词： aged SBS-modified asphalt regeneration mechanisms base oil rheological properties morphology

Thermosensitive and Wound-Healing Gelatin-Alginate Biopolymer Hydrogels Modified with Humic Acids

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Journal of Renewable Materials 2024年第10期12卷 1691-1713页

作者： Denis Miroshnichenko Vladimir Lebedev Katerina Lebedeva Anna Cherkashina Sergey Petrushenko Olena Bogoyavlenska Anzhela Olkhovska Ihor Hrubnyk Liudmyla Maloshtan Natalja Klochko The Department of Oil Gas and Solid Fuel Refining TechnologiesNational Technical University«Kharkiv Polytechnic Institute»Kharkiv61002Ukraine The Department of Plastics and Biologically Active Polymers Technology National Technical University«Kharkiv Polytechnic Institute»Kharkiv61002Ukraine Faculty of Physics V.N.Karazin Kharkiv National UniversityKharkiv61000Ukraine Technical University of Liberec Liberec46117Czech Republic The Department of Organizations and Management Healthcare and Social Medicine National Technical University«Kharkiv Polytechnic Institute»Kharkiv61002Ukraine The Common Pharmacy Department National Technical University«Kharkiv Polytechnic Institute»Kharkiv61002Ukraine Department of Micro-and Nanoelectronics National Technical University«Kharkiv Polytechnic Institute»Kharkiv61002Ukraine

The main goal of the article is the creation and study of thermosensitive and wound-healing gelatin-alginate bio-polymer hydrogels modified with humic *** rheological properties,swelling and contraction behavior were experimentally investigated,elucidated using Fourier transform infrared spectroscopy and used to achieve the physiological melting point,which is necessary for successful drug *** has been shown that in the gelatin-alginate-humic acid biopolymer hydrogels systems,it is possible to obtain a gel-sol transition temperature close to the physiological temperature of 37℃,which is important for drug delivery in the treatment of *** changing the type and concentration of humic acids in the gelatin-alginate hydrogel,it turned out to be achiev-able to regulate the softening time of the gel on the human body in the range from 6 to 20 min,which provides the possibility of controlled prolonged delivery of *** on the study of the influence of calcium ions on the properties of humic acids and ion exchange,as well as the interaction of humic acids,sodium alginate and gelatin with the formation of tighter gel networks,approaches to regulate the rate of softening of hydrogels at physiological temperature and their swelling,which simulates the absorption of exudate,were proposed and *** addition,low shrinkage of the hydrogel surface due to cross-linking of gelatin-alginate networks when modified with humic acids was experimentally confirmed,which is important for avoiding problems of wound contracture and contour deformations when using dressings for wound ***,the developed opti-mized innovative biopolymer hydrogels synergistically combine the outstanding properties of natural molecular polymers and humic acids and are promising for the creation of effective medicines for wound healing.

关键词： Gelatin-alginate hydrogel humic acids wound healing rheological properties swelling thermosensitivity contraction

Triptolide-loaded microemulsion-based hydrogels: physical properties and percutaneous permeability

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Acta Pharmaceutica Sinica B 2013年第3期3卷 185-192页

作者： Lihua Chen Xiaoting Zhao Jia Cai Yongmei Guan Sen Wang Hongning Liu Weifeng Zhu Junsong Li Key Laboratory of Modern Preparation of TCM Ministry of EducationJiangxi University of TCMNanchang 330004China College of Pharmacy Nanjing University of Chinese MedicineNanjing 210023China

Triptolide is a diterpenoid compound that inhibits the inflammation of rheumatoid arthritis(RA).However,the use of triptolide is limited due to its strong gastrointestinal *** purpose of this work was to develop a transdermal delivery system for triptolide to reduce this toxicity.A microemulsion-based hydrogel(MBH)was prepared from the combination of Gemseal 40-oleic acid as oil phase,Tween 80-labrasol as surfactant,anhydrous ethanol as co-surfactant,water as aqueous phase and Poloxamer 407 as hydrogel *** measurements,environmental scanning electron microscopy(ESEM)and transdermal experiments in vitro were used to characterize triptolide-loaded and blank MBH *** effects of Poloxamer 407 and triptolide on the rheological properties and microstructures of the MBH were *** and homogeneous MBH could only be formed when the concentration of Poloxamer 407 in the selected O/W microemulsion was in the range of 14.0–16.0%(w/w).When the concentration of Poloxamer 407 increased,the rheological properties such as the yield stresses(sy),storage and loss moduli(G′,G″)of the formulations increased,and the network structures became more *** addition of triptolide did not change the interconnected network structures of the MBH *** preparations afford a better sustained release profile when compared to microemulsions,a finding confirmed by an in vitro permeation test in *** appears to be a promising vehicle for transdermal delivery of triptolide.

关键词： Microemulsion-based hydrogel rheological properties Environmental scanning electron microscopy Triptolide In vitro permeation

Research on UV Aging Characteristics of Inorganic Powder Modified Asphalt Binders

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武汉理工大学学报 2010年第17期32卷 76-82页

作者： YU M WU S P HAN J LIU X Key Laboratory of Silicate Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Asphalt binders tend to age when exposed to ultraviolet radiation (UV) and high temperature. Asphalt modification is an effective method to improve the performances of asphalt materials,in which inorganic powders modified asphalts are useful and lowly cost. In this study Organic montmorillonite(OMMT),Magnesium hydroxide(Mg(OH)2) ,mineral filler are used as nano-powder modifiers while these three modified asphalts as well as matrix asphalt are used in the UV-based aging experiments. Aging performances are appraised by means of dynamic rheometer tests. In the simulation experiments,these two kinds of asphalt membrane,while different dosages of the modifier(0%,2%,4%),would be put into the UV aging box for 24 *** additional different UV-aging times while the same dosage of the modifier are also researched. By exploring some new measures to evaluate UV-aging,the OMMT modified asphalt binder and Mg(OH)2,which has the layered structure,were found to have a certain ability to restraint ultraviolet radiation. The results show that longer aging time performed more serious UV-aging,more contents of modifier performed a better resistance to UV-aging while the OMMT exhibited a better resistance to aging than Mg(OH)2 modified asphalts.

关键词： ultraviolet radiation aging rheological properties modified

Astragalus membranaceus(Fisch.)*** by dissolving microneedles achieves systemic therapeutic effects at low doses Author links open overlay panel

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Journal of Traditional Chinese Medical Sciences 2024年第3期11卷 340-350页

作者： Yiwen Chen Zihan Zhou Luzheng Zhang Zifan Ding Pengyue Li Cong Yan School of Life Sciences Beijing University of Chinese MedicineBeijing 102488China Dongzhimen Hospital Beijing University of Chinese MedicineBeijing 100029China School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing 102488China

Objective:To determine the main components of Astragalus membranaceus(Fisch.)Bge(***,Huang Qi),Astragaloside IV(AIV)and Astragalus polysaccharides(AP),to characterize their properties,evaluate their in vivo efficacy,and to analyze drug diffusion using dissolving microneedle(DMN)technology in ***: Respectively,AIV-and AP-loaded DMNs comprising chitosan(CTS)and polyvinyl alcohol(PVA)were prepared via dual-mold *** morphology,mechanical properties,in vivo solubility,and skin irritation characteristics were *** vivo efficacy was assessed in cyclophosphamide-induced immunosuppressed mice,in vivo diffusion of AIV and AP by DMNs and conventional methods was compared,and the rheological properties of AIV-CTS-PVA and AP-CTS-PVA mixtures were ***: Subcutaneous dissolution and absorption of AIV-CTS-PVA and AP-CTS-PVA microneedles(MNs)at low doses(50%–17%of intraperitoneal AIV injection and 12%–4%of intravenous AP injection)reduced the spleen index and acid phosphatase activity in immunosuppressed mouse models,increased the thymus index,and achieved equivalent or better systemic therapeutic *** with injections,AIV and AP achieved controllable solid-liquid conversion through delivery with CTS-PVA MNs,resulting in highly localized aggregation within 48 h,reducing the initial explosive effect of the drug,and achieving stable and slow drug ***: The present study enhances our understanding of the efficacy and remote effects of drug-loaded DMNs from a traditional Chinese medicine(TCM)perspective,thereby promoting the development of precise and efficient delivery of TCM and further expanding the drug-loading range and application scenarios for DMNs.

关键词： Dissolving microneedle Astragaloside IV Astragalus polysaccharides In vivo diffusion rheological properties Acupuncture Immunosuppression Drug delivery

Preparation of Dashanzha Wan by three-dimensional printing

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Journal of Traditional Chinese Medical Sciences 2023年第1期10卷 52-57页

作者： Fengyuan Qin Zifan Ding Cong Yan School of Life Science Beijing University of Chinese MedicineBeijing 102488China

Objective:To use three-dimensional(3D)printing technology to prepare Dashanzha ***:The standard formula proportion of Dashanzha Wan was used to prepare printable materials(normally called the ink)for 3D printing,and different doses and shapes of Dashanzha Wan were ***,the rheological properties,texture characteristics,scanning electron microscopy,and content of ursolic acid were ***:Dashanzha Wan ink showed good shear thinning properties,which is very suitable for 3D *** printed sample had a beautiful and regular shape with high ***,ursolic acid content in 3D-printed Dashanzha Wan aligned with the ursolic acid content shown in the Pharmacopoeia of the People's Republic of China ***:The 3D-printed Dashanzha Wan has a better texture,and can be shaped into various shapes according to individual needs,which would increase patients’interest when taking ***,3D printing of Dashanzha Wan could be easily integrated into the digital life system,enabling online customization or use at *** study reveals that 3D printing technology is a promising method for the production of traditional Chinese medicine with personalized appearance,dosage,and texture,which is suitable for a broader population.

关键词： Three-dimensional printing Dashanzha Wan Customized appearance rheological properties Textural analysis Microstructure observation Ursolic acid Preparation process

A Review of Studies on the Interaction Between Waves and Muddy Bottom

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China Ocean Engineering 1992年第2期7卷 187-200页

作者： Zhao Zidan Professor and Doctoral Supervisor, Tianjin University, 300072 Tianjin

This paper presents a brief review of the results on the interaction between waves and muddy bottom obtained during the last decade including the results obtained by the author at the Coastal Engineering Laboratory of... 详细信息

关键词： coastal area estuarine environment mud rheological properties rheograme Bingham fluid yield stress coefficient of rigidity

Increasing the toughness while reducing the viscosity of carbon nanotube/ polyether imide/polyether ether ketone nanocomposites

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新型炭材料（中英文） 2024年第4期39卷 715-728页

作者： SONG Jiu-peng ZHAO Yan LI Xue-kuan XIONG Shu LI Shuang WANG Kai School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Polyether ether ketone(PEEK)has good mechanical ***,its high viscosity when molten limits its use because it is hard to *** nanocomposites containing both carbon nanotubes(CNTs)and polyether imide(PEI)were pre-pared by a direct wet powder blending method using a vertical injection molding *** addition of an optimum amount of PEI lowered the viscosity of the molten PEEK by approximately 50%while producing an increase in the toughness of the nanocom-posites,whose strain to failure increased by 129%,and fracture energy increased by 97%.The uniformly dispersed CNT/PEI powder reduced the processing difficulty of PEEK nanocomposites without affecting the thermal *** improvement of the strength and viscosity of PEEK facilitate its use in the preparation of thermoplastic composites.

关键词： Nanocomposites Mechanical properties rheological properties Microstructural analysis

Powder Characteristics on the rheological Performance of Resin-based Zirconia Suspension for Stereolithography

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无机材料学报 2020年第2期35卷 231-235页

作者： LI Xing-Bang ZHONG He ZHANG Jing-Xian DUAN Yu-Sen JIANG Dong-Liang State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China Suzhou Institute of SICCAS(Shanghai Institute of Ceramics Chinese Academy of Sciences)Taicang 215499China

As for ceramic stereolithography technique,the preparation of suitable resin-based ceramic slurry is of primary *** this study,the effects of powder characteristics such as specific surface area,particle size and distribution,particle morphology on the rheological behavior of zirconia resin-based suspensions were investigated *** show that the specific surface area of the powder is the most important factor affecting slurry *** low specific surface area and quasi-spherical shaped powder is more likely to obtain low viscosity *** addition,the influence of solid loading on the flow behavior were also studied using Krieger-Dougherty *** samples with the relative density of(97.83±0.33)%were obtained after sintering at 1550℃.No obvious abnormal grain growth in the microstructure of the sintered body is *** indicate that after the optimization of the processing parameters with the help of rheology characterization,complex-shaped high-quality zirconia parts can be obtained using the stereolithography technique.

关键词： zirconia ceramic stereolithography slurry rheological properties

rheological characteristics of injection molded titanium alloys powder

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Transactions of Nonferrous Metals Society of China 2013年第9期23卷 2605-2610页

作者：王家惠史庆南吴承玲席健昆明理工大学城市学院昆明650051 昆明理工大学材料科学与工程学院昆明650093

Ti-6Al-4V alloy powder was taken as raw material. 60%（mass fraction） paraffin, 35%low density polyethylene and 5%stearic acid were employed as binders to prepare injection feedstocks. Capillary rheometer was adopted to determine the rheological parameters and to analyze the rheological properties of the feedstocks at different milling time, powder loading and temperature. It is indicated through the results that the viscosity increases and the value of n decreases with the increase of milling time. The more the powder loading is, the higher the viscosity is. The empirical formula on the relationship between the viscosity and the powder loading is： ηr=η/ηb=A（1-Ф/Фmax）/^- m . The value m is calculated as 0.33. The flow activation energy Ea decreases with the increase of shear rate.

关键词： injection molding titanium alloy feedstock rheological properties