Design and Synthesis of Molecular Machines: Understanding the Nobel Prize in Chemistry 2016
The Nobel Prize in Chemistry 2016 has been awarded to Jean-Pierre Sauvage, J. Fraser Stoddart and Bernard L. Feringa, for the design and synthesis of molecular machines. Sauvage works in University of Strasbourg, France, and Stoddart is the professor of Northwestern University, Evanston, IL, USA, who designed the interlocked molecular, catenanes and rotaxanes, based on mechanical bonds. Feringa is from University of Groningen, the Netherlands, whose contribution for the development of molecular machines was to synthesize and make a molecular motor to obtain unidirectional rotation.
Mathematical Derivation of Work Behaving as Process Function in Physical Chemistry
Employing p-V graphic method has been considered as a common practice to expound that the work is process function in teaching of physical chemistry. This paper proved that the work is a process function transmitting the energy between system and environment by using the mathematical derivation. This work is provided with crucial significance to further master the concepts of process function and state function, as well as the relationship between process function and state function.
Methods and Conditions of Dehydration of Hydrated Metal Halides
Teaching Design of Electrophilic Substitution Reaction of Aromatics Based on Mechanism
How to guarantee the teaching quality of organic chemistry in the context of reducing class and not reducing the teaching effect is one of the problems to be solved. It is very common in college organic chemistry that different reactions go through the same progress, such as Friedel-Crafts (alkylation and acylation) reaction, halogenating reaction, sulfonation reaction, nitration reaction and Hoesch reaction have the same electrophilic substitution mechanism. This paper showed the teaching design of electrophilic substitution reaction based on mechanism that required less time. At the same time this paper summarized a learning suggestion about the electrophilic substitution reactions.
Effective Teaching of University Chemistry
The effectiveness of university classroom teaching is an important factor affecting higher education quality that should meet the need of students' growth and development. In the teaching process, it is an effective way to improve the effectiveness of university classroom to transform the "center" position of teachers, combine inquiry oriented and traditional teaching mode organically, and set up scientific, objective, fair and incentive achievement evaluation system for assessing comprehensively students' learning. The long-term effectiveness of university classroom could be guaranteed by enlightening students' wisdom and cultivating their ability with teaching knowledge, skills and methods as medium
Exploration of Gold Sol for Improving the Properties Study of Colloid
The preparation and properties study of Fe(OH)3 sols is an experimental curriculum of college chemistry, but the light scattering property of Fe(OH)3 sol is weak and the color change of the sol induced by electrolyte is not obvious to observe. These deficiencies lead to undesirable experimental results. To cover these shortages, this work used gold sol to improve the experiment and carried out the studies of dynamic and optical properties of gold sols, electrophoresis of gold sols, and the coagulation induced by electrolytes. The results showed that gold sols were easy to prepare and possessed excellent optical property. The operation of properties study was simple with ideal results. Thus gold sols can serve as a substitution of Fe(OH)3 sols for student experiment.
Safety and Environmental Protection in Organic Chemistry Laboratory
Improvement of Experiment Equipment of 8-Hydroxyquinoline Preparation
In view of the deficiency of traditional 8-hydroxyquinoline preparation experimental device, this paper redesigned a new experimental device for synthesis of 8-hydroxyquinoline based on the existing teaching experiments of organic chemistry in university. Miniature funnel and the conventional grinding mouth instrument manifolds were connected and assembled in laboratory and the problem about the late unreacted ortho nitrophenol treatment and the separation of 8-hydroxyquinoline was solved. The experimental results showed that the improved experimental device was simple, safe, time saving, and the experimental efficiency was also improved obviously.
Improvement and Expansion of Kinetic Study on Styrene Bulk Polymerization
The basic experiment of kinetic study on styrene bulk polymerization was improved and expanded. The direct weighing method through precipitation was used to replace the means of dilatometer. In limited hours arrangements, the polymerization rate and relative molecular weight of polymer were both obtained. As a result, the visibility and comprehensiveness of the experiment were increased and students could understand reaction kinetics of polymerization more deeply.
Comparison of Methods to Determine Titrant Volume of Titration End Point
Determine titrant volume of titration end point is the core of titration analysis work. Taking experiment of ferrous potassium dichromate titration as example, three kinds of manual potentiometric titration method to determine the titrant volume of titration end point (E-V curve method, ΔE/ΔV-V curve and Δ2E/ΔV2- curve) have been described in order to guide students to compare and analyze the titration results of manual potentiometric titration method, automatic potentiometric titration method and indicator method. Considering methods for dmetermining titrant volume of titration end point as a system could help the students to understand principles and calculation methods, and comparing the three methods could deepen students' understanding of the selection of titration method.
Quantitative Evaluation Method of Analytical Chemistry Course Construction in Higher Vocational Colleges
In order to solve the problem of quantitative evaluation of analytical chemistry course construction in higher vocational colleges, the main contents of the construction of analytical chemistry course in higher vocational colleges were analyzed, the evaluation index system was constructed accordingly by using the CIPP evaluation model, and a method of using fuzzy analytic hierarchy process and quantum behaved particle swarm optimization algorithm to calculate the weight of index was proposed. Then the fuzzy comprehensive evaluation method and MATLAB programming technology were used to realize the quantitative evaluation of the effectiveness of analytical chemistry course construction in higher vocational colleges. The result showed that it was accurate and effective, and had a certain practical value.
Application of Coal Macromolecular Structure Theory in Coal Chemical Experiment Teaching
Based on the coal macromolecular structure theory, the teaching contents of coal chemistry experiment were set up, and the experiment teaching was carried out. This experiment project took the coal proximate analysis experiment, the coal elemental analysis experiment and the coal calorific value experiment as an order. During the teaching process, a combination of main and auxiliary board was adopted as blackboard writing design, focusing on training students' thinking ability of using the coal molecular structure theory to analyze coal's compositions and properties, and compare experimental results of different coal samples. This kind of teaching mode could highlight the central position of coal macromolecular structure theory, build a knowledge system of "coal formation, coal structure and coal properties", and improve students' thinking ability step-by-step:first, grasping the overall laws of moisture, volatile matter and fixed carbon contents changeing with coalification degree, further analyzing C, H, O elements change characteristics in different coalification stages, finally comprehensive evaluating combustible and non-combustible matter's affects on the coal calorific value.
Participatory Teaching Mode in Organic Chemistry Experiment for Pharmacy Students
The concept and characteristics of participatory teaching were presented in this study. And the participatory teaching plan of organic chemistry experiment for students majoring in pharmacy was carried out carefully. The experiment "preparation of acetylsalicylic acid" was used as an example to discuss the specific steps and procedures of the participatory teaching, and the task and role of students and teachers in teaching process. The students' autonomous learning ability and innovative ability have been improved greatly through the development of the participatory teaching.
Applications of M-Learning in Medicinal Chemistry Education
In order to explore novel patterns of M-Learning, this article briefly introduced the M-Learning Apps of medicinal chemistry information, laboratory applications, and drug design based on the characteristics of medicinal chemistry and the realities of graduate students.Finally, M-learning and traditional PC learning were compared based on a medicinal chemistry case.
Application of Gaussian Software in Spectrometric Identification of Organic Compounds Teaching (Ⅱ): Visualization for UV Spectrum and Electronic Transition of Indole
According to theoretical research results of indole ultraviolet spectrum based on software Gaussian 09, Gaussian View was adopted to visualize transition trajectories in indole ultraviolet spectrum, allowing students to more intuitively learn about π→π* transition which is common in ultraviolet spectrum and understand the essence of ultraviolet spectrum, so as to improve teaching effect. As the indole ultraviolet spectrum is of typical characteristic of π→π* transition, it is generally taken as an example in ultraviolet spectrum teaching. Therefore, this paper took indole ultraviolet spectrum as example to introduce the specific application of software Gaussian in ultraviolet spectrum teaching, so as to provide some reference for peers.
Allowable Range of Ionic Strength of Precipitation Titration
Discussion of Equivalent Hybridization and Unequivalent Hybridization of Hybrid Orbital Theory
The quantum chemical calculation was employed to discuss equivalent hybridization and unequivalent hybridization of hybrid orbital theory. The equivalent hybridization and unequivalent hybridization are identified by hybrid orbital composition rather than orbital electron number.
Development Overview of Textile Fiber
In the application history of textile materials, human have gone through the development from natural fibers to synthetic fibers. Fibrilia, cotton, silk and fur is the earliest used natural textile fibers. At the end of the 19th century, with the rise of modern chemistry and chemical industry, man opened up a new era of chemical fiber. Since the 1950s, based on the rapid development of modern petrochemical industry, people entered a new period of polymer fibers with polyester fiber as the representative. And in the middle and late 20th century, a great variety of new composite textile fibers has become the main force of modern textile material.