Effects of High-Concentration Alkali Treatment on Surface Bioactivity of Porous Titanium

2020 ◽  
Vol 15 (1) ◽  
pp. 154-160
Author(s):  
Xingping Fan
Keyword(s):  
Bone Formation ◽  
Treatment Time ◽  
Sodium Hydroxide Solution ◽  
Alkali Treatment ◽  
Porous Titanium ◽  
Surface Activation ◽  
Bone Induction ◽  
Back Muscle ◽  
High Concentration ◽  
Dense Titanium

Various surface treatment methods have been used to modify the surface activation of dense titanium. In this study, a high concentration of sodium hydroxide solution was used to treat porous titanium prepared by adding porous agent at different times. The results of the study showed that after alkali treatment, porous titanium was implanted into the back muscle of the dog and the implanted sample was taken out for bone formation protein-2 enzymatic immunoassay after 6 months. The porous titanium inner wall has been covered. The microstructures vary with the treatment time. The treated surface can induce the formation of hydroxyapatite deposition and promote the expression of BMP-2, which shows good bone induction. High concentration alkali treatment of porous titanium, the method is simple, can shorten the HA formation time, can effectively activate porous titanium inner and outer surfaces, is an effective method to prepare bioactive porous titanium.

Effects of Different Treatments on Surface Activity of Rice Straw Particleboard

2020 ◽  
Vol 12 (2) ◽  
pp. 289-295 ◽  
Author(s):  
Xian-Qing Xiong ◽  
Ying-Ying Yuan ◽  
Yi-Ting Niu ◽  
Liang-Ting Zhang ◽  
Zhi-Hui Wu
Keyword(s):  
Rice Straw ◽  
Surface Activity ◽  
Treatment Time ◽  
Ph Value ◽  
Sodium Hydroxide Solution ◽  
Alkali Treatment ◽  
Surface Absorption ◽  
Bonding Performance ◽  
Absorption Performance ◽  
Corona Treatment

The surface activity of rice straw particleboard (RSP), which has a significant effect on the finishing and bonding performance, is reduced by wax coating and free radicals on the straw fiber. The RSP surface was treated by corona treatment and alkali treatment to reveal the effects of different treatments on the surface activity of RSP. The infiltration height method was applied to evaluate the variation of surface activity. The alkalized samples of RSP with different densities were prepared by using sodium hydroxide solution with pH value of 8∼14. The samples of different densities were then subjected to corona treatment under high purity oxygen conditions with treatment power of 50 W, 100 W, 300 W, and 500 W and with a time of 4 min or 7 min. The surface activity of the treated specimens was evaluated by measuring the absorption properties of three kinds of liquids by infiltration-height method: distilled water, glycerin, and alcohol. The results revealed the following. (1) After alkalization treatment, the surface absorption performance of RSP for these three liquids was improved, and it increased with the increase of pH value of the treatment solution. The suitable pH value of the alkalized solution for RSP is 7∼11, which can improve the surface absorption performance. (2) After corona treatment, the surface absorption performance of RSP increased with the increase of corona treatment power. RSP had the highest surface absorption performance for alcohol. With the density of RSP increased, the surface absorbability slightly decreased. Therefore, it is not suitable to utilize corona treatment in improving absorption for the higher density RSP. At the same time, with the variation of corona treatment time, the absorption of RSP surface changed irregularly because of the polarity of different test liquids. (3) The reasonable parameters of alkalization treatment and corona treatment are beneficial in improving the gluability of RSP. These results have guiding significance for RSP surface decoration process.

Preparation of Porous Titanium with High Porous Titanium and Surface Modification with High Concentration Alkaline Treatment

2013 ◽  
Vol 834-836 ◽  
pp. 211-214
Author(s):  
Xing Ping Fan
Keyword(s):  
Surface Modification ◽  
Titanium Surface ◽  
Alkali Treatment ◽  
Alkaline Treatment ◽  
Immersion Test ◽  
Porous Titanium ◽  
Network Structures ◽  
High Porosity ◽  
High Concentration

Porous titanium scaffolds with high porosity are fabricated by sintering. The bioactivity of the porous titanium has been improved by high concentration alkaline treatment. Through the modification, the titanium surface showed a network structures. The SBF immersion test indicates that apatite was formed on the porous titanium scaffold with high porosity after 10M/L alkali treatment in 12h. The results of study show the network structured endowed the porous titanium with bioactivity.

scholarly journals Change of Dispersibility and Refractive Index of Zirconia Suspension Depending on Alkali Treatment Time

2017 ◽  
Vol 27 (1) ◽  
pp. 1-7
Author(s):  
Choong Hee Jo ◽  
◽  
Dong Seok Ham ◽  
Jae Heung Lee ◽  
Juwhan Ryu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Treatment Time ◽  
Alkali Treatment ◽  
Zirconia Suspension

Effect of alkali treatment on the flexural properties of a Luffa cylindrica-reinforced epoxy composite

2018 ◽  
Vol 25 (1) ◽  
pp. 85-93 ◽  
Author(s):  
Niharika Mohanta ◽  
Samir K. Acharya
Keyword(s):  
Flexural Strength ◽  
Treatment Time ◽  
Saline Water ◽  
Fiber Composite ◽  
Alkali Treatment ◽  
Fiber Composites ◽  
Subzero Temperature ◽  
Flexural Properties ◽  
Luffa Cylindrica ◽  
Untreated Fiber

AbstractThis experimental study was conducted to investigate the effect of NaOH concentration and treatment time on the flexural properties ofLuffa cylindricafiber-reinforced epoxy composites. Significant improvement (up to 84.92%) in the flexural properties for the treated fiber composite compared with the untreated fiber composite was observed. Both treated and untreated fiber composites were then subjected to different environmental treatments (saline water, distilled water, and subzero temperature). To find out the changes in flexural strength immediately after treatment, the same test was carried out on the composites. Degradation in the flexural strength of both treated and untreated fiber composites, when subjected to environmental treatments, was observed. They were found within the range of 2%–20% and were found to be least in subzero treatment. The SEM micrograph indicates that alkali treatment is effective in improving the adhesion between the fiber and matrix.

scholarly journals Production of normal mice from spermatozoa denatured with high alkali treatment before ICSI

Reproduction ◽  
2009 ◽  
Vol 137 (5) ◽  
pp. 779-792 ◽  
Author(s):  
Chong Li ◽  
Eiji Mizutani ◽  
Tetsuo Ono ◽  
Teruhiko Wakayama
Keyword(s):  
Cell Membrane ◽  
Alkali Treatment ◽  
Methylation Status ◽  
Control Group ◽  
Oocyte Activation ◽  
Dna Double Strand Breaks ◽  
High Concentration ◽  
Developmental Potential ◽  
Normal Offspring ◽  
Activation Capacity

In mammals, ICSI is now a very important tool for both assisted reproductive technology and studying the mechanisms of fertilization. In the latter experiments, it is important to use spermatozoa that have lost their oocyte activation capacity but still retain their developmental potential. In this study, we used high-concentration NaOH to remove oocyte activation potential from spermatozoa, and examined whether normal offspring could be generated from these spermatozoa after ICSI. The spermatozoa were treated with different concentrations of NaOH (1–100 mM) for 1 h and then neutralized with equal amounts of same concentration of HCl. In 10 mM NaOH-treated spermatozoa, the cell membrane was broken and most of them failed to activate oocytes after their injection into the oocytes. However, these spermatozoa did not show strong damage, and after artificial activation with SrCl2, all of the zygotes were judged as normal by immunostaining to check the methylation status of histone H3 lysine 9, low chromosome damage by karyotype assay and staining with DNA double-strand breaks marker, γH2AX. Moreover, after transferring those embryos into recipient females, 106 (36.7%) live and healthy offspring were delivered, which is similar to the rate in the fresh control group. By contrast, spermatozoa treated with lower NaOH concentrations retained their oocyte activation capacity and those treated with higher concentrations lost their developmental potential. This suggests that 10 mM NaOH for 1 h is the best treatment to completely destroy the cell membrane and activation capacity of spermatozoa without injuring their developmental potential.

scholarly journals Structural Evaluation on Sugarcane Bagasse Treated Using Sodium and Calcium Hydroxide

2019 ◽  
Vol 130 ◽  
pp. 01018
Author(s):  
Juliana Anggono ◽  
Hariyati Purwaningsih ◽  
Suwandi Sugondo ◽  
Steven Henrico ◽  
Sanjaya Sewucipto ◽  
...  
Keyword(s):  
Weight Loss ◽  
Calcium Hydroxide ◽  
Structural Changes ◽  
Natural Fiber ◽  
Treatment Time ◽  
Alkali Treatment ◽  
Natural Fibers ◽  
Additional Treatment ◽  
Structural Evaluation ◽  
By Products

Greater interest in recent years to the increase demand in using natural fiber reinforcement of polymers is to comply with the increasing stringent international protocols related to climate change and environmental awareness. Many studies have reported the development of renewable and biodegradable agricultural by-products as reinforcement fibers for biocomposites. One of the essential factors in producing strong biocomposites is the properties prepared from the natural fibers which results from the alkalitreatment given. This research aims to evaluate the effect of different treatment duration on structural changes on sugarcane after alkali treatment using sodium hydroxide (NaOH) and calcium hydroxide (Ca(OH)2) solutions. Calcium hydroxide was used as comparative solution in search for milder and more environmental friendly alkali solution as an alternative solution of NaOH. Fourier Transform Infrared (FTIR) confirmed the major removal of lignin and minor of hemicellulose. It shows that the structure did not change considerably with the additional treatment time. The weight loss measurement after each treatmentshows a higher weight loss with the treatment with NaOH (40.5 % to 57.75 %) than the weight loss after Ca(OH)2 treatment (25 % to 46 %). Scanning electron microscope (SEM) observed the morphology changes onthe fiber from both treatments.

Hydroxyapatite nanoparticles in poly-D,L-lactic acid coatings on porous titanium implants conducts bone formation

2010 ◽  
Vol 95A (3) ◽  
pp. 665-672 ◽  
Author(s):  
Thomas Jensen ◽  
Thomas Jakobsen ◽  
Jørgen Baas ◽  
Jens V. Nygaard ◽  
Alireza Dolatshahi-Pirouz ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Bone Formation ◽  
Porous Titanium ◽  
Titanium Implants ◽  
Hydroxyapatite Nanoparticles

Bone Induction in Porous HAp Block Modified by Partial Dissolution-Precipitation Technique with Supersonic Treatment in Rat Scalp

2014 ◽  
Vol 631 ◽  
pp. 430-434 ◽  
Author(s):  
Masaru Murata ◽  
Toshiyuki Akazawa ◽  
Y. Minamida ◽  
Md. Arafat Kabir ◽  
J. Hino ◽  
...  
Keyword(s):  
Bone Formation ◽  
Combination Method ◽  
Bone Induction ◽  
Partial Dissolution ◽  
Surface Areas ◽  
Micro Cracks ◽  
Specific Surface Areas ◽  
The Many ◽  
Biomimetic Hydroxyapatite ◽  
And Cartilage

Microcracks and trabecular fractures can be observed in physiological bone. Biomimetic hydroxyapatite (HAp) scaffolds have been strongly needed in bone regenerative medicine. We have been developing the combination method of the partial dissolution-precipitation techniques involving the stirring-supersonic treatment in 1.7×10-2 N HNO3 solution containing Ca2＋and PO43- ions to improve the surface and the bulk of commercially available synthetic HAp block (82.5% in porosity, 50-300µm in macropore). The modified HAp was named as a partially dissolved and precipitated HAp (PDP-HAp). The aims of this study are to characterize the PDP-HAp and to observe cell response for the ceramics in rat scalp tissue. The PDP-HAp exhibited the macropore sizes of 50-200µm, the porosities of 85-90%, and the specific surface areas of 1.0-2.0 m2･g-1, with many micro-cracks. Twenty rats were divided into 2 groups. At 9 months, bone induction occurred inside the many pores in the PDP-HAp group, while bone and cartilage were not found in the HAp group. We believe that osteoinduction by the PDP-HAp is different from the process of BMP-loaded HAp-induced bone formation. The PDP-HAp might be applied as potential ceramics with osteoinductive properity and excellent biocompatibility in difficult bone regenerative cases.

Laboratory Experiments on the Alteration of Highly-Compacted Bentonite by Alkaline Solution and the Effects on Physical Properties

2011 ◽  
Author(s):  
Satoru Miyoshi ◽  
Shinya Morikami ◽  
Yukinobu Kimura ◽  
Tomoko Jinno ◽  
Shuichi Yamamoto
Keyword(s):  
Hydraulic Conductivity ◽  
Pore Solution ◽  
Sodium Hydroxide Solution ◽  
Mineral Dissolution ◽  
Alkali Solution ◽  
Exchangeable Cation ◽  
High Concentration ◽  
Compacted Bentonite ◽  
Aqueous Silicon ◽  
The Difference

The laboratory experiment was done that 1.0mol/L sodium hydroxide solution was injected to the compacted bentonite whose density is the same as the prospected value in the concept of the intermediate-level disposal in Japan in the circumstance of 70°C temperature. After the injection of the alkali solution for approximately 600 days, the bentonite was taken out of the apparatus and some sorts of analysis were done. The accompanying minerals in the bentonite, calcedony and quartz, were dissolved and disappeared in XRD charts. Then analcime was precipitated as a secondary mineral. Although montmorillonite was dissolved, the mass fraction of it was kept approximately. The hydraulic conductivity of the bentonite calculated using the flow rate at the end of the injection of alkali solution was smaller than the prospected value based on a widely-used empirical model of the hydraulic conductivity of compacted bentonite as a function of the equivalent concentration of pore solution, montmorillonite partial void ratio, and the ratio of sodium ion equivalent to the exchangeable cation equivalent. The reasons for the difference were supposed to be the decrease of pore size brought by mineral dissolution and the large viscosity of pore solution involving high concentration aqueous silicon.

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