Menthol, Borneol, Camphor and WS-3 Eutectic Mixture

2012 ◽  
Vol 506 ◽  
pp. 355-358 ◽  
Author(s):  
S. Tuntarawongsa ◽  
T. Phaechamud
Keyword(s):  
Room Temperature ◽  
Chemical Interaction ◽  
Glass Plate ◽  
Eutectic Mixture ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Eutectic System ◽  
Newtonian Flow ◽  
Eutectic Systems ◽  
Unique Composition

Eutectic system is a mixture or solution which the ingredients solidify or liquefy simultaneously. A eutectic mixture is therefore that unique composition of two (or more) components that has the lower crystallization temperature or melting point. This aim of this study was to prepare and characterize the eutectic systems containing menthol, borneol, camphor and N-Ethyl-5-methyl-2-(1-methylethyl) cyclohexanecarboxamide (WS-3). Menthol is able to form liquid eutectic at room temperature with camphor in the ratio of 8:2, 7:3, 6:4 and 5:5 whereas menthol and borneol in the ratio of 8:2 and 7:3, menthol and WS-3 in the ratio of 6:4 and 1:1. The rheology behavior of all liquid eutectic systems was Newtonian flow which the surface tension was in the range of 28-29 mN/m. From contact angle measurement, all liquid eutectic systems were categorized as high wettability to the glass plate. The suitable liquid eutectic system for further application as liquid carrier for injectable active compounds was 1:1 menthol:camphor because of its lowest viscosity. IR spectra indicated that there was no chemical interaction of these two materials in the selected liquid eutectic mixture.

Mechanical Properties of Polyvinyl Chloride Composites Reinforced with Magnesium Borate Whiskers

2013 ◽  
Vol 821-822 ◽  
pp. 1143-1147
Author(s):  
Lie Li ◽  
Xue Ying Nai ◽  
Gui Min Qian ◽  
Dong Hai Zhu ◽  
Wu Li
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Room Temperature ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Magnesium Borate ◽  
Binding Force ◽  
Adsorbed Layers ◽  
Surface Contact Angle ◽  
Scanning Electron

To improve the strength and toughness performance of PVC, the resin reinforced with magnesium borate whiskers (MBOW ) were prepared by mixing whiskers into liquid PVC at room temperature. The effects of borate coupling agent (SBW-III) and contents of MBOw (0~30wt%) on tensile of PVC and composites were studied. The compatibility, hydrophilicity and morphology of MBOw/PVC composites were characterized by Fourier transform infrared spectroscopy ( FTIR), surface contact angle measurement and scanning electron microscopy (SEM) respectively. The results show that both the chemical bonding and physically adsorbed layers exist between MBOw and SBW-III. The surface of modified MBOw is hydrophobic which improves the binding force between PVC and treated MBOw, and the dispersibility of MBOw in PVC significantly. The tensile and the elastic modulus of the SBW-III-treated MBOw /PVC composites increase in comparison to that of the composites filled with untreated MBOw.

scholarly journals Facile Preparation of Bilayer Titanium Silicate (TS-1) Zeolite Membranes by Periodical Secondary Growth

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 850
Author(s):  
Qi Zhang ◽  
Yong Liu ◽  
Xuguang Liu ◽  
Laibo Ma
Keyword(s):  
Room Temperature ◽  
Secondary Growth ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Zeolite Membrane ◽  
Distribution Analysis ◽  
The Novel ◽  
Titanium Silicate ◽  
Water Contact ◽  
Growth Method

A facile periodical secondary growth method, based on conventional secondary growth, is proposed to prepare bilayer TS-1 membranes. The novel periodical secondary growth consists of two or several periods, which involve three steps: the temperature is programmed to a desired crystallization temperature as the first stage, followed by holding for a certain duration, and finally cooling to room temperature. This periodical crystallization model enables a bilayer TS-1 membrane to be produced, while the conventional secondary growth method produces a monolayer TS-1 membrane. The bilayer TS-1 membrane exhibits a superior defect-free structure and hydrophobic properties, as illustrated by SEM, gas permeance, pore size distribution analysis, and water contact angle measurement. It displays an earlier desalination separation factor compared to the monolayer TS-1 membrane. This work demonstrates that the periodical secondary growth is an advanced approach for preparing a bilayer zeolite membrane with excellent properties.

Polymeric Eutectic System

2012 ◽  
Vol 528 ◽  
pp. 180-183 ◽  
Author(s):  
S. Tuntarawongsa ◽  
T. Phaechamud
Keyword(s):  
Surface Tension ◽  
Drug Release ◽  
Chemical Interaction ◽  
Polymer Concentration ◽  
Eutectic Mixture ◽  
Eutectic System ◽  
Biocompatible Polymer ◽  
Exponential Curve ◽  
Pharmaceutical Applications ◽  
The One

The liquid eutectic system comprising 1:1 menthol:camphor was selected to use as solvent due to it was lowest viscosity. Both menthol and camphor used in this eutectic system have been reported for their many pharmaceutical used. Various polymers were tested for their solubility in this eutectic system. Eudragit® EPO showed the highest solubility. Eudragit® EPO was the one of biocompatible polymer which could dissolve in this eutectic system up to 40% w/w with no chemical interaction of each compound. Viscosity of this system showed the exponential curve as a function of polymer concentration but all concentration showed the newtonian rheology. The pH and surface tension were slightly affected by type and amount of polymers. The obtained polymeric eutectic mixture should control the drug release for pharmaceutical applications.

Characteristics of Dammar Based Paint System with the Addition of Silver Nanoclay

2013 ◽  
Vol 701 ◽  
pp. 192-196
Author(s):  
Aisyah Nor Hasnan ◽  
Azizah Hanom Ahmad ◽  
Mazatulikhma Mat Zain
Keyword(s):  
Contact Angle ◽  
Room Temperature ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Adhesion Property ◽  
Paint System ◽  
Disc Diffusion ◽  
E Coli ◽  
Paint Systems ◽  
Excellent Adhesion

Five different paint systems are formulated using mixture of dammar, silver and nanoclay in various compositions. The paint mixture is spin coated onto Aluminium Q-panel (substrate) and then is left to dry at room temperature. This paper describes the characteristics of the dammar based paint system. Adhesion property is evaluated by using the crosshatch method based on ASTM D3359 standards. The wettability property of coating is characterized by using contact angle measurement. The resistances of paint systems are also described against microbial activity by using disc diffusion and agar well diffusion. The result of crosshatch test shows that the coating system containing 50 wt. % of dammar (PD) exhibits an excellent adhesion property. The addition of dammar to polyol helps to increase the contact angle measurement up to 45.8 degree. The largest inhibition diameter zone against E. coli and S. aureus is obtained for the silver nanoclay polyol dammar, PDS3 paints system.

scholarly journals Superhydrophobic functionalized cellulosic paper by copper hydroxide nanorods for oils purification

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmed S. Belal ◽  
Jehan El Nady ◽  
Azza Shokry ◽  
Shaker Ebrahim ◽  
Moataz Soliman ◽  
...  
Keyword(s):  
Contact Angle ◽  
Filter Paper ◽  
Separation Efficiency ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Absorption Capacity ◽  
Morphological Properties ◽  
Copper Hydroxide ◽  
Immersion Method ◽  
Water Contact

AbstractOily water contamination has been sighted as one of the most global environmental pollution. Herein, copper hydroxide nanorods layer was constructed onto cellulosic filter paper surface cured with polydopamine, Ag nanoparticles, and Cu NPs through immersion method. This work has been aimed to produce a superhydrophobic and superoleophilic cellulosic filter paper. The structure, crystalline, and morphological properties of these modified cellulosic filter paper were investigated. Scanning electron microscope images confirmed that the modified surface was rougher compared with the pristine surface. The contact angle measurement confirmed the hydrophobic nature of these modified surfaces with a water contact angle of 169.7°. The absorption capacity was 8.2 g/g for diesel oil and the separation efficiency was higher than 99%. It was noted that the flux in the case of low viscosity solvent as n-hexane was 9663.5 Lm−2 h−1, while for the viscous oil as diesel was 1452.7 Lm−2 h−1.

Preparation and the Blood Compatibility of Titanium Oxide Nanorod Arrays

2011 ◽  
Vol 306-307 ◽  
pp. 25-30 ◽  
Author(s):  
Ping Luo ◽  
Zhan Yun Huang ◽  
Di Hu Chen
Keyword(s):  
Contact Angle ◽  
Surface Morphology ◽  
Titanium Oxide ◽  
Tin Oxide ◽  
Growth Parameters ◽  
Blood Compatibility ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Nanorod Arrays ◽  
Wetting Properties

In this work, titanium oxide nanorod arrays were fabricated by using the hydrothermal method on fluorine-doped tin oxide (FTO) coated glass. The diameter of the nanorods could be controlled from 150 nm to 30 nm by changing the growth parameters. The surface morphology and the structure of the samples were characterized by SEM and XRD. The wetting properties were identified by contact angle measurement. Platelet attachment was investigated to evaluate the blood compatibility of the samples with different nanoscale topographies. Results show that the nanotopographical surfaces perform outstanding blood compatibility, and the adhering platelet decreased with the increasing diameter of the nanorods.

Tailoring the in vitro characteristics of poly(vinyl alcohol)-nanohydroxyapatite composite scaffolds for bone tissue engineering

2016 ◽  
Vol 36 (8) ◽  
pp. 771-784 ◽  
Author(s):  
Tejinder Kaur ◽  
Arunachalam Thirugnanam ◽  
Krishna Pramanik
Keyword(s):  
Mechanical Strength ◽  
Vinyl Alcohol ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Poly Vinyl Alcohol ◽  
Apatite Formation ◽  
Composite Scaffolds ◽  
Alizarin Red ◽  
Casting Technique

Abstract Poly(vinyl alcohol) reinforced with nanohydroxyapatite (PVA-nHA) composite scaffolds were developed by varying the nHA (1%, 2%, 3%, 4%, and 5%, w/v) composition in the PVA matrix by solvent casting technique. The developed composite scaffolds were characterized using scanning electron microscopy (SEM), X-ray powder diffraction (XRD), attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, and contact angle measurement. The stability of the composite scaffolds in physiological environment was evaluated by swelling and degradation studies. Further, these composite scaffolds were tested for in vitro bioactivity, hemolysis, biocompatibility, and mechanical strength. SEM micrographs showed a homogenous distribution of nHA (3%, w/v) in the PVA matrix. XRD and ATR-FTIR analysis confirmed no phase contamination and the existence of the chemical bond between PVA-nHA at approximately 2474 cm-1. PVA-nHA composite scaffolds with 3% (w/v) concentration of nHA showed nominal swelling and degradation behavior with good mechanical strength. The mechanical strength and degradation properties of the scaffold above 3% (w/v) of nHA was found to deteriorate, which is due to the agglomeration of nHA. The in vitro bioactivity and hemolysis studies showed improved apatite formation and hemocompatibility of the developed scaffolds. In vitro cell adhesion, proliferation, alkaline phosphatase activity, and Alizarin red S staining confirmed the biocompatibility of the composite scaffolds.

Plasma Pre-Treatment of Polyethylene Terephthalate Substrate Influence on the Properties of ZnO Thin Film

2014 ◽  
Vol 895 ◽  
pp. 41-44
Author(s):  
Seiw Yen Tho ◽  
Kamarulazizi Ibrahim
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Polyethylene Terephthalate ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Zno Thin Films ◽  
Zno Thin Film ◽  
Water Contact ◽  
Pre Treatment ◽  
Pet Substrate

In this work, the influences of plasma pre-treatment on polyethylene terephthalate (PET) substrate to the properties of ZnO thin film have been carried out. ZnO thin films were successfully grown on PET substrate by spin coating method. In order to study the effects of plasma pre-treatment, a comparison of treated and untreated condition was employed. Water contact angle measurement had been carried out for PET wettability study prior to ZnO thin film coating. Morphology study of ZnO thin film was performed by scanning probe microscope (SPM). Besides, optical study of the ZnO thin film was done by using UV-vis spectrophotometer. All the measured results show that plasma pre-treatment of PET substrate plays an important role in enhancing the wettability of PET and optical properties of the ZnO thin films. In conclusion, pre-treatment of PET surface is essential to produce higher quality ZnO thin film on this particular substrate in which would pave the way for the integration of future devices.

Measurement of wheel-terrain contact angle for WMRs on rough terrain using laser scanning sensor

2017 ◽  
Vol 44 (6) ◽  
pp. 798-807 ◽  
Author(s):  
He Xu ◽  
Yan Xu ◽  
Peiyuan Wang ◽  
Hongpeng Yu ◽  
Ozoemena Anthony Ani ◽  
...  
Keyword(s):  
Contact Angle ◽  
Laser Scanning ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Rough Terrain ◽  
Wheeled Mobile Robots ◽  
Wheel Slip ◽  
Content Type ◽  
Terrain Model ◽  
Measurement Approach

Purpose The purpose of this paper is to explore a novel measurement approach for wheel-terrain contact angle using laser scanning sensors based on near-terrain perception. Laser scanning sensors have rarely been applied to the measurement of wheel-terrain contact angle for wheeled mobile robots (WMRs) in previous studies; however, it is an effective way to measure wheel-terrain contact angle directly with the advantages of simple, fast and high accuracy. Design/methodology/approach First, kinematics model for a WMR moving on rough terrain was developed, taking into consideration wheel slip and wheel-terrain contact angle. Second, the measurement principles of wheel-terrain contact angle using laser scanning sensors was presented, including “rigid wheel - rigid terrain” model and “rigid wheel - deformable terrain” model. Findings In the proposed approach, the measurement of wheel-terrain contact angle using laser scanning sensors was successfully demonstrated. The rationality of the approach was verified by experiments on rigid and sandy terrains with satisfactory results. Originality/value This paper proposes a novel, fast and effective wheel-terrain contact angle measurement approach for WMRs moving on both rigid and deformable terrains, using laser scanning sensors.

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