物理化学期刊(英文)最新文献_第6页

Updated Definition of the Three Solvent Descriptors Related to the Van der Waals Forces in Solutions 与溶液中范德华力相关的三种溶剂描述符的更新定义

物理化学期刊(英文) Pub Date : 2018-01-24 DOI: 10.4236/OJPC.2018.81001

P. Laffort

{"title":"Updated Definition of the Three Solvent Descriptors Related to the Van der Waals Forces in Solutions","authors":"P. Laffort","doi":"10.4236/OJPC.2018.81001","DOIUrl":"https://doi.org/10.4236/OJPC.2018.81001","url":null,"abstract":"Innovative viewpoint on the older topic of the van der Waals forces, is of interesting and significant issue to be concerned in both the fields related to the fundamental investigation and thus valuable in guiding the new physiochemical phenomena and processes for both academic research and practical applications. The intermolecular Van der Waals forces involved in solutions have been recently deeply reconsidered as far as the solute side is concerned. More precisely, the solute descriptors (or parameters) experimentally established, have been accurately related to molecular features of a Simplified Molecular Topology. In the present study, an equivalent result is reached on the solvent side. Both experimental parameters have been obtained simultaneously in previous Gas Liquid Chromatographic studies for 121 Volatile Organic Compounds and 11 liquid stationary phases, via an original Multiplicative Matrix Analysis. In that experimental step, five groups of forces were identified, two of hydrogen bonding and three of Van der Waals: 1) dispersion (London), 2) orientation or polarity strictly speaking (Keesom), and 3) induction-polarizability (Debye). At this stage, an attempt of characterization the solvent parameters via the SMT procedure has been limited to those related to the Van der Waals forces, those related to the hydrogen bonding being for now left aside.","PeriodicalId":59839,"journal":{"name":"物理化学期刊(英文)","volume":"08 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2018-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44668681","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: 0

Corrosive Behavior and Physic-Chemical Characterization of Filtration Tanks 滤池的腐蚀行为和物理化学特性

物理化学期刊(英文) Pub Date : 2017-11-16 DOI: 10.4236/OJPC.2017.74008

Francisco Casanova-del-Angel

引用次数: 1

Many Electron Atoms: Ionization Energies of Transition Elements 多电子原子:跃迁元素的电离能

物理化学期刊(英文) Pub Date : 2017-07-04 DOI: 10.4236/OJPC.2017.73007

S. Tosto

引用次数: 4

Difference in Number of Electrons in Inner Shells of Charged or Uncharged Elements in Organic and Inorganic Chemistry: Compatibility with the Even-Odd Rule 有机化学和无机化学中带电和未带电元素内壳层中电子数的差异：与奇偶规则的相容性

物理化学期刊(英文) Pub Date : 2017-05-11 DOI: 10.4236/OJPC.2017.72006

G. Auvert

{"title":"Difference in Number of Electrons in Inner Shells of Charged or Uncharged Elements in Organic and Inorganic Chemistry: Compatibility with the Even-Odd Rule","authors":"G. Auvert","doi":"10.4236/OJPC.2017.72006","DOIUrl":"https://doi.org/10.4236/OJPC.2017.72006","url":null,"abstract":"The recently introduced even-odd rule has been shown to successfully represent chemical structures of ions and molecules. While comparing available drawings in the scientific literature with the list of compounds predicted by the even-odd rule, it became however obvious that existing compounds are fewer than expected. Several predicted compounds involving many covalent bonds have apparently never been experimentally observed. Neutral oxygen for instance is expected to have 6 valence electrons, whereas oxygen can only build a maximum of two bonds, as in water. This specificity is observed for elements in the top-right corner of the periodic table. For compounds to contain only single covalent bonds, and thus follow the even-odd rule, further explanations are necessary. The present paper proposes that those specific elements experience a transfer of electrons from the valence shell into the inner shell, making them unavailable for further bonding. These elements will be described as organic, hereby providing a clear and hopefully unifying definition of the term. In opposition, inorganic elements have a constant inner shell no matter their electrical state or the number of bonds they maintain. More than 70 compounds involving 11 elements of the main group are studied, revealing a progression from fully inorganic elements at the left of the periodic table to fully organic elements. The transition between inorganic or organic elements is made of few elements that take an organic form when negatively charged; they are labelled semi-organic. The article concludes that the fully organic elements of the main group are Oxygen and Fluorine, whereas semi-organic elements are more numerous: C, N, S, Cl, Se, Br and I. Thus, the even-odd rule becomes fully compatible with scientific knowledge of compounds in liquid or gaseous phase.","PeriodicalId":59839,"journal":{"name":"物理化学期刊(英文)","volume":"07 1","pages":"72-88"},"PeriodicalIF":0.0,"publicationDate":"2017-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45587934","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: 4

Kinetic Approach of Iodine Quantification in Dietary Salts 膳食盐中碘定量的动力学方法

物理化学期刊(英文) Pub Date : 2017-05-11 DOI: 10.4236/OJPC.2017.72003

G. Gbassi, Thodhekes N. S. J. Yao, P. Atheba, M. D. Yéhé, Germain A. Brou, M. Ake, A. Trokourey

引用次数: 2

Simplified Coarse-Grained Dynamic Model for Real Gases 真实气体的简化粗颗粒动力学模型

物理化学期刊(英文) Pub Date : 2017-05-11 DOI: 10.4236/OJPC.2017.72005

P. G. Papadopoulos, C. Koutitas, Yannis N. Dimitropoulos, E. Aifantis

引用次数: 0

A Comparative Kinetic Study on the Efficacious Permanganate Oxidation of Fluorenes in Perchloric and Sulfuric Acid Media 高锰酸盐在高氯酸和硫酸介质中高效氧化芴的动力学比较研究

物理化学期刊(英文) Pub Date : 2017-05-11 DOI: 10.4236/OJPC.2017.72004

R. S. Jassas, A. Fawzy, Rami J. Obied, Mohammed A. S. Abourehab, Saleh A. Ahmed

引用次数: 0

A Molecular Description of Superconductivity of Sulfur Hydride and Related Systems under High-Pressure Conditions 高压条件下硫氢化物及其相关系统超导性的分子描述

物理化学期刊(英文) Pub Date : 2017-01-09 DOI: 10.4236/OJPC.2017.71002

H. Buck

{"title":"A Molecular Description of Superconductivity of Sulfur Hydride and Related Systems under High-Pressure Conditions","authors":"H. Buck","doi":"10.4236/OJPC.2017.71002","DOIUrl":"https://doi.org/10.4236/OJPC.2017.71002","url":null,"abstract":"It has been shown that the recently discovered sulfur trihydride (H3S) can be considered as a superconductor with a transition temperature Tc of 203 Kelvin (K) at 155 GigaPascals (GPa). This is the highest Tc value reported for any superconductor. The established superconductivity occurs via the formation of a molecular system with sulfur atoms arranged on a body-centered cubic lattice. It has been generally accepted that the high Tc value is the result of an efficient electron-phonon interaction. The responsible substance formed by H2S under high pressure, may be considered as a compound with H3S stoichiometry creating an impressive network with hydrogens. We will focus on the hydrogen bonding between sulfur and hydrogens demonstrating a symmetrical arrangement. The geometry of the individual radical compound in relation to corresponding systems will be discussed. Ab initio calculations based on a linear three-center two-, three- and four-electron type of bonding clearly visualized in combination with the dynamics of the Van’t Hoff concept, as described by us in various papers, give a good description of this exclusive network. We also discuss the superconductivity of related phosphorus hydrides and focus on the stability and geometrical differences with respect to the H3S system. These differences are significant, demonstrating the diversity in various structures in showing superconductivity.","PeriodicalId":59839,"journal":{"name":"物理化学期刊(英文)","volume":"07 1","pages":"9-25"},"PeriodicalIF":0.0,"publicationDate":"2017-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48192084","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: 1

The Effect of Fabrication Conditions on the Morphology and Photocatalytic Activity of Bismutite Bi 2 O 2 CO 3 Particles 制备条件对铋矿Bi2O2CO3颗粒形貌及光催化活性的影响

物理化学期刊(英文) Pub Date : 2017-01-09 DOI: 10.4236/OJPC.2017.71001

Hong Hu, Changlong Xiao

引用次数: 5

Reappraising 1907 Einstein’s Model of Specific Heat 重新评价1907年爱因斯坦的比热模型

物理化学期刊(英文) Pub Date : 2016-10-25 DOI: 10.4236/OJPC.2016.64011

S. Tosto

引用次数: 3