Study of Solution by Excess Thermodynamic Functions | Chapter 5 | Current Perspective to Physical Science Research Vol. 5

 The study of various types of solutions by the principles of excess thermodynamic functions is very main to understand the interaction patterns betwixt molecules and ions in the solutions.Namely by using ultrasonic waves, dipole importance,  density, refractive index, stickiness, deviation in viscosity, surplus free energy, surface tension to decide the thermodynamic functions and its excess as glut internal pressure, audile impedance and its overkill, rigid sphere width, internal pressure, excess surface strain, dimensionless surface tension and allure excess, the change of entropy accompanying pressure and excess volume, growth coefficient, relative change in volume too polarizability, solvated radii and vapor chromatography and Rayleigh scattering.

Author(s) Details:

Farid Mohamed Mahmoud Farag,
Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, Egypt.

Please see the link here: https://stm.bookpi.org/CPPSR-V5/article/view/12912

A Physicochemical Study to Evaluate the Subsistence of Inclusion Complexes of Cyclodextrins with 1-Butyl-2, 3-dimethylimidazolium Tetrafluoroborate Probe | Chapter 5 | Current Topics on Chemistry and Biochemistry Vol. 2

 Ionic liquids (ILs) are solvents that are nonvolatile, nonflammable, and thermally stable. Because they do not affect the environment, they are referred to as green solvents. Inclusion complexes of ionic liquid, 1-butyl-2,3-dimethylimidazolium tetrafluoroborate (BDMImBF4) into the cavity of hollow cylinder oligosaccharide,α- and β-cyclodextrins have been seen in aqueous medium. Surface tension and conductance measurements validate the stoichiometry of interfacial inclusion, whereas IR and 1HNMR spectroscopy demonstrate the phenomena of inclusion. The interaction between cyclodextrin and ionic liquid is studied using volumetric and viscometric measurements.

Author(s) Details:

Kalipada Sarkar,
Department of Chemistry, Islampur College, Islampur, Uttar Dinajpur: 733202, India.

Debadrita Roy,
Department of Chemistry, University of North Bengal, Darjeeling: 734013, India.

Sanjoy Barman,
Department of Chemistry, University of North Bengal, Darjeeling: 734013, India.

Baishali Saha,
Department of Chemistry, University of North Bengal, Darjeeling: 734013, India.

Siti Barman,
Department of Chemistry, University of North Bengal, Darjeeling: 734013, India.

Mahendra Nath Roy,
Department of Chemistry, University of North Bengal, Darjeeling: 734013, India and  Alipurduar University, Alipurduar-736122, India.

Please see the link here: https://stm.bookpi.org/CTCB-V2/article/view/7132

Surfactants: Role in Pharmaceutical Formulation | Chapter 1 | Challenges and Advances in Pharmaceutical Research Vol.1

 Surfactants are substances that lower a liquid's Surface tension, allowing it to spread more easily, as well as the Interfacial tension between two liquids or a liquid and a solid. Surfactants are naturally amphiphilic. Both hydrophilic and lipophilic characteristics are present. Surfactants are used to suspend immiscible liquids or solids in water or another liquid as foaming agents, emulsifiers, and dispersants. The current research examines appropriate surfactants in various pharmacological dosage forms, as well as their benefits and drawbacks. The article also discusses the compatibility of surfactants in various formulations as well as their use.

Author(s) Details:

Amiyakanta Mishra,
CPS, Puri, Odisha, India


Biswaranjan Ray,
GCP, Sambalpur, Odisha, India.

Please see the link here: https://stm.bookpi.org/CAPR-V1/article/view/6232

Review on the Actively-Controlled Colloidal Dampers and Investigations on a Colloidal Damper Rendered Controllable under the Variable Magnetic Field Generated by Moving Permanent Magnets| Chapter 10 | Newest Updates in Physical Science Research Vol. 7

 Following a study of the operating principle of a colloidal damper rendered controllable (CDRC), this Chapter presents a review of different types of controlling devices and their sensitivity. The controllability of a new form of colloidal absorber, rendered controllable under varying magnetic fields, is then experimentally tested. This absorber is made up of a water-based ferrofluid (FERROTEC MSG-W10) and a liquid-repellent nanoporous solid body made up of gamma alumina and/or silica gel particles. Permanent neodymium annular magnets are positioned either on the piston head (axial magnetic field) or on the exterior surface of the cylinder to control the dynamic properties (radial magnetic field). The quantity of the displaced liquid by the magnets through the damper's filter and through the nanoporous solid body was estimated after flow visualisations inside a transparent model damper were done. The fluctuation of the magnetic flux density at the magnet surface with the magnet's height and versus the target distance was measured experimentally. The appropriate magnet geometry was chosen based on this information. The trial colloidal damper's three-dimensional structural model, created with Solidworks, and the excitation test rig are then shown. Excitation studies on a ball-screw shaker revealed that the proposed absorber had greater damping capacities than a standard colloidal damper, as well as the ability to modify the damping coefficient depending on the excitation type.

Author(s) Details

Barenten Suciu
Department of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-ku, Fukuoka-shi, Fukuoka 811-0295 Japan.

View Book :- https://stm.bookpi.org/NUPSR-V7/article/view/1297

Review on the Actively-Controlled Colloidal Dampers and Investigations on a Colloidal Damper Rendered Controllable under the Variable Magnetic Field Generated by Moving Permanent Magnets| Chapter 10 | Newest Updates in Physical Science Research Vol. 7

 Following a study of the operating principle of a colloidal damper rendered controllable (CDRC), this Chapter presents a review of different types of controlling devices and their sensitivity. The controllability of a new form of colloidal absorber, rendered controllable under varying magnetic fields, is then experimentally tested. This absorber is made up of a water-based ferrofluid (FERROTEC MSG-W10) and a liquid-repellent nanoporous solid body made up of gamma alumina and/or silica gel particles. Permanent neodymium annular magnets are positioned either on the piston head (axial magnetic field) or on the exterior surface of the cylinder to control the dynamic properties (radial magnetic field). The quantity of the displaced liquid by the magnets through the damper's filter and through the nanoporous solid body was estimated after flow visualisations inside a transparent model damper were done. The fluctuation of the magnetic flux density at the magnet surface with the magnet's height and versus the target distance was measured experimentally. The appropriate magnet geometry was chosen based on this information. The trial colloidal damper's three-dimensional structural model, created with Solidworks, and the excitation test rig are then shown. Excitation studies on a ball-screw shaker revealed that the proposed absorber had greater damping capacities than a standard colloidal damper, as well as the ability to modify the damping coefficient depending on the excitation type.

Author(s) Details

Barenten Suciu
Department of Intelligent Mechanical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-ku, Fukuoka-shi, Fukuoka 811-0295 Japan.

View Book :- https://stm.bookpi.org/NUPSR-V7/article/view/1297