Research Letters in Physical Chemistry最新文献_第2页

Hollow Disc and Sphere-Shaped Particles from Red Blood Cell Templates 来自红细胞模板的空心圆盘和球形颗粒

Research Letters in Physical Chemistry Pub Date : 2008-04-29 DOI: 10.1155/2008/726285

Preston B. Landon, J. Gutierrez, Sara A. Alvarado, Sujatha Peela, Srinivasan Ramachandran, F. Arce, R. Lal

引用次数: 0

Hydriding Reaction of LaNi5: Correlations between Thermodynamic States and Sorption Kinetics during Activation LaNi5的氢化反应:激活过程中热力学状态与吸附动力学的关系

Research Letters in Physical Chemistry Pub Date : 2008-04-29 DOI: 10.1155/2008/346545

P. Millet, C. Lebouin, R. Ngameni, A. Ranjbari, M. Guymont

{"title":"Hydriding Reaction of LaNi5: Correlations between Thermodynamic States and Sorption Kinetics during Activation","authors":"P. Millet, C. Lebouin, R. Ngameni, A. Ranjbari, M. Guymont","doi":"10.1155/2008/346545","DOIUrl":"https://doi.org/10.1155/2008/346545","url":null,"abstract":"This research work concerns the hydriding reaction of LaNi5 during the first hydriding cycles (activation process). Step-by-step sorption isotherms (Δ[H/M]≈0.03) were measured at 298 K, in the composition range 0<H/M<2.0, at the beginning (first hydriding cycle, where hysteresis is maximum) and at the end (tenth hydriding cycle, where hysteresis is minimum) of the activation process, offering the possibility to correlate thermodynamic states (pressure-composition data points) to sorption kinetics. Using pneumatochemical impedance spectroscopy (PIS), experimental impedance diagrams were obtained for each data point of the isotherms. Microscopic rate parameters such as surface resistance and hydrogen diffusion coefficient were obtained as a function of composition, by fitting appropriate model equations to experimental impedances. It is found that the high-frequency pneumatochemical resistance significantly decreases during activation. This is correlated with the surface increase of the solid-gas interface area. The hydrogen diffusion coefficient is found to be larger at the beginning of the activation process and lower on a fully activated sample.","PeriodicalId":229171,"journal":{"name":"Research Letters in Physical Chemistry","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114230464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Room-Temperature Growth of SiC Thin Films by Dual-Ion-Beam Sputtering Deposition 双离子束溅射沉积SiC薄膜的室温生长

Research Letters in Physical Chemistry Pub Date : 2008-04-03 DOI: 10.1155/2008/760650

C. Jin, Xiaofeng Wu, L. Zhuge

引用次数: 8

The Effect of Tb and Sm Ions on the Photochromic Behavior of Two Spiropyrans of Benzoxazine Series in Solution Tb和Sm离子对苯并恶嗪系两种螺吡喃在溶液中光致变色行为的影响

Research Letters in Physical Chemistry Pub Date : 2008-03-27 DOI: 10.1155/2008/314898

Esam Bakeir, G. Attia, M. B. Lukyanova, B. Lukyanov, andM. S. A. Abdel-Mottaleb

引用次数: 7

Fast Drug Release Using Rotational Motion of Magnetic Gel Beads 利用磁凝胶珠的旋转运动快速释放药物

Research Letters in Physical Chemistry Pub Date : 2008-03-26 DOI: 10.1155/2008/671642

T. Mitsumata, Yusuke Kakiuchi, J. Takimoto

{"title":"Fast Drug Release Using Rotational Motion of Magnetic Gel Beads","authors":"T. Mitsumata, Yusuke Kakiuchi, J. Takimoto","doi":"10.1155/2008/671642","DOIUrl":"https://doi.org/10.1155/2008/671642","url":null,"abstract":"Accelerated drug release has been achieved by means of the fast rotation of magnetic gel beads. The magnetic gel bead consists of sodium alginate crosslinked by calcium chlorides, which contains barium ferrite of ferrimagnetic particles, and ketoprofen as a drug. The bead underwent rotational motion in response to rotational magnetic fields. In the case of bead without rotation, the amount of drug release into a phosphate buffer solution obeyed non-Fickian diffusion. The spontaneous drug release reached a saturation value of 0.90 mg at 25 minutes, which corresponds to 92% of the perfect release. The drug release was accelerated with increasing the rotation speed. The shortest time achieving the perfect release was approximately 3 minutes, which corresponds to 1/8 of the case without rotation. Simultaneous with the fast release, the bead collapsed probably due to the strong water flow surrounding the bead. The beads with high elasticity were hard to collapse and the fast release was not observed. Hence, the fast release of ketoprofen is triggered by the collapse of beads. Photographs of the collapse of beads, time profiles of the drug release, and a pulsatile release modulated by magnetic fields were presented.","PeriodicalId":229171,"journal":{"name":"Research Letters in Physical Chemistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123230295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Pt/TiO2 Coupled with Water-Splitting Catalyst for Organic Pollutant Photodegradation: Insight into the Primary Reaction Mechanism Pt/TiO2配水催化降解有机污染物的初步反应机理

Research Letters in Physical Chemistry Pub Date : 2008-03-24 DOI: 10.1155/2008/810457

Zizhong Zhang, Xuxu Wang, Jinlin Long, Xianliang Fu, Z. Ding, Z. Li, Ling Wu, Xianzhi Fu

引用次数: 1

The Cold Contact Method as a Simple Drug Interaction Detection System 冷接触法作为一种简单的药物相互作用检测系统

Research Letters in Physical Chemistry Pub Date : 2008-02-19 DOI: 10.1155/2008/169247

Ilma Nugrahani, Sukmadjaja Asyarie, S. N. Soewandhi, Slamet Ibrahim

引用次数: 4

Study of Polymer Material Aging by Laser Mass Spectrometry, UV-Visible Spectroscopy, and Environmental Scanning Electron Microscopy 高分子材料老化的激光质谱、紫外可见光谱和环境扫描电镜研究

Research Letters in Physical Chemistry Pub Date : 2007-12-06 DOI: 10.1155/2007/95753

J. Exposito, C. Becker, D. Ruch, F. Aubriet

{"title":"Study of Polymer Material Aging by Laser Mass Spectrometry, UV-Visible Spectroscopy, and Environmental Scanning Electron Microscopy","authors":"J. Exposito, C. Becker, D. Ruch, F. Aubriet","doi":"10.1155/2007/95753","DOIUrl":"https://doi.org/10.1155/2007/95753","url":null,"abstract":"Dyed natural rubber (NR) and styrene butadiene rubber (SBR), designed for outdoor applications, were exposed to an accelerated artificial aging in xenon light. The aging results in the deterioration of the exposed surface material properties. The ability of dyed polymers to withstand prolonged sunlight exposure without fading or undergoing any physical deterioration is largely determined not only by the photochemical characteristics of the absorbing dyestuff itself but also by the polymer structure and fillers. Results obtained by laser mass spectrometry, UV-visible spectroscopy, and environmental scanning electron microscopy indicate that dyed filled NR and SBR samples behave differently during the photo-oxidation. The fading of the dyed polymers was found to be promoted in the NR sample. This can be correlated with LDI-FTICRMS results, which show the absence of [M-H]− orange pigment pseudomolecular ion and also its fragment ions after aging. This is confirmed by both EDX and UV/Vis spectroscopy. EDX analysis indicates a concentration of chlorine atoms, which can be considered as a marker of orange pigment or its degradation products, only at the surface of SBR flooring after aging. Reactivity of radicals formed during flooring aging has been studied and seems to greatly affect the behavior of such organic pigments.","PeriodicalId":229171,"journal":{"name":"Research Letters in Physical Chemistry","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121008686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Structure of Low-Lying Excited States of Guanine in DNA and Solution: Combined Molecular Mechanics and High-Level Coupled Cluster Studies 鸟嘌呤在DNA和溶液中的低洼激发态结构:结合分子力学和高耦合簇的研究

Research Letters in Physical Chemistry Pub Date : 2007-11-13 DOI: 10.1155/2007/85978

K. Kowalski, M. Valiev

引用次数: 2

Theoretical Study of Sequence Selectivity and Preferred Binding Mode of Psoralen with DNA 补骨脂素序列选择性及与DNA结合模式的理论研究

Research Letters in Physical Chemistry Pub Date : 2007-11-07 DOI: 10.1155/2007/60623

Patricia Saenz-Méndez, R. Guedes, D. J. V. A. Santos, L. Eriksson

引用次数: 3