A Novel Room-Temperature Bonding Method Based on Electrohydrodynamic Printing

2021 ◽  
Vol 21 (3) ◽  
pp. 1672-1677
Author(s):  
Wenzheng Wu ◽  
Xue Yang ◽  
Rui Liu ◽  
Zhifu Yin ◽  
D. F. Wang ◽  
...  
Keyword(s):  
Microfluidic Chip ◽  
Silicon Substrate ◽  
Bonding Strength ◽  
Room Temperature ◽  
Production Efficiency ◽  
Microfluidic Chips ◽  
Electrohydrodynamic Printing ◽  
Inner Diameter ◽  
Bonding Method

Microfluidic chips made by traditional materials (glass and silicon) are still important for fluorescence tests, biocompatible experiments, and high temperature applications. However, the majority of the present bonding methods suffer from ultra-clean requirement, complicated fabrication process, and low production efficiency. In the present work, an Electrohydrodynamic printing assist bonding method was proposed. By this method, the ultraviolet-cured-glue dots were printed onto the silicon substrate, and then the patterned glass and silicon substrate can be bonded together at room temperature. The influence of printing condition (nozzle inner-diameter, applied voltage, printing height, and flow rate) on the diameter of printed dot was analyzed by experiments. By the optimized printing condition, the glass-silicon microfluidic chip can be well bonded. The bonding strength and leakage test demonstrated the high bonding quality of the microfluidic chip (bonding strength of 28 MPa and leakage pressure of 3.5 MPa).

A Microfluidic Chip Microwave Bonding Method Based on the PMMA

2013 ◽  
Vol 562-565 ◽  
pp. 561-565
Author(s):  
Xiao Wei Liu ◽  
Xiao Wei Han ◽  
He Zhang ◽  
Xi Yun Jiang ◽  
Lin Zhao
Keyword(s):  
Microwave Radiation ◽  
Microfluidic Chip ◽  
Mass Production ◽  
Bonding Strength ◽  
Microfluidic Chips ◽  
Ultrasonic Bonding ◽  
Microwave Absorbing ◽  
Bonding Method ◽  
Bonding Technique

A new bonding technique mainly for PMMA microfluidic chips is presented in this paper. In this technique, polymer microfluidic microchannels were bonded by microwave radiation. Its strength and time can be controlled accurately in watt and second level. There are so many techniques for mass-production of polymer microfluidic chip, such as heat bonding, ultrasonic bonding. However, we may find different kinds of shortages when we use these techniques. In this paper, the experiment result shows that microwave radiation’s strength and time have effects on microfluidic chip`s bonding strength. The microwave absorbing coating can also have a certain degree influence on microfluidic chip`s bonding strength.

Effect of Temperature on the Interfacial Bonding Strength between PVB and Glass from RT to -50 °C

2011 ◽  
Vol 492 ◽  
pp. 61-65 ◽  
Author(s):  
Yuan Tian ◽  
Yi Wang Bao ◽  
De Tian Wan ◽  
Xiu Fang Wang ◽  
Zhi Ming Han
Keyword(s):  
Bonding Strength ◽  
Room Temperature ◽  
Testing Temperature ◽  
Interfacial Bonding ◽  
Effect Of Temperature ◽  
Laminated Glass ◽  
Interfacial Bonding Strength ◽  
Cooling Speed ◽  
Bonding Method ◽  
Shear Bonding Strength

Laminated glass and photovoltaic laminated glass are widely used in architecture. The interfacial bonding strengths between poly(vinyl butyral) (PVB) and glass were investigated by the cross-bonding method from room temperature to -50 °C. The loading speed was 5 mm/min, and the cooling speed was about 0.5 °C/min. The testing sample was hold at each temperature for half an hour. It was revealed that the testing temperature had great effect on the bonding strength. At room temperature, the tensile bonding strength was 11.49 MPa and the shear bonding strength was 6.61 MPa. With the temperature decreased from RT to -50 °C, the tensile bonding strength was decreased by 66.81%, but the shear bonding strength was increased by 212.16%. From RT to -30 °C, the change rates of the tensile and shear bonding strength bonding strength were 65.57% and 172.68% respectively, only 3.61% and 14.48% from -30 °C to -50 °C. The mechanism for the bonding strength depended on testing temperatures from RT to -50 °C was also discussed.

Non-Melt Ultrasonic Bonding Method for Polymer MEMS Devices

2014 ◽  
Vol 607 ◽  
pp. 133-138
Author(s):  
Zong Bo Zhang ◽  
Qing Qiang He ◽  
Cao Qing Yan
Keyword(s):  
Bonding Strength ◽  
Theoretical Study ◽  
Mechanical Systems ◽  
Micro Channel ◽  
Microfluidic Chips ◽  
Mems Devices ◽  
Ultrasonic Bonding ◽  
Low Dimension ◽  
Bonding Method ◽  
Polymer Mems

Based on the theoretical study in our previous work, a novel thermal assisted ultrasonic bonding method for polymer Micro/nanoElectro-Mechanical Systems (M/NEMS) has been demonstrated. Bonding experiments of PMMA microfluidic chips with micro-channel of 80 μm in depth and width were conducted. The result shows numerous superiorities of this method including high bonding strength (0.95 MPa), low dimension loss (0.8% in depth and 0.3% in width, respectively) and short bonding duration.

scholarly journals A Rapid Bonding Method for Fabricating Mixing Microfluidic Chip Based on Micromachining Technology

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Junyao Wang ◽  
Qi Hou ◽  
Huan Liu ◽  
Qi Sun ◽  
Hengyi Yuan
Keyword(s):  
Contact Angle ◽  
Microfluidic Chip ◽  
Bonding Strength ◽  
High Efficiency ◽  
Isocyanic Acid ◽  
Mixing Efficiency ◽  
Bonding Force ◽  
Bonding Effect ◽  
Bonding Method ◽  
Polyether Polyol

In this paper, a rapid bonding method is reported to fabricate a mixing microfluidic chip. The chip is composed of a glass upper plat and a polyurethane bottom plat. The upper plat with a microchannel is obtained through micromachining technology. And the bottom plat is manufactured via mixing the solution with the component of isocyanic acid and polyether polyol. The influence of the solution’s proportion on the contact angle and bonding force is investigated to enhance the hydrophilicity and the bonding strength. Furthermore, a mixing experiment is implemented to verify the chip’s bonding effect. The experimental results demonstrate that with increasing the proportions of isocyanic acid and polyether polyol, the contact angle and the bonding force increase at first and then decrease gradually. That is attributed to the variation of internal porous structure for different proportions. Considering the contact angle and the bonding force synthetically, the optimal proportion of 3.7 w/w is confirmed. The mixing efficiency is increased from 0.157 to 0.824. Compared with other bonding methods, the method in this paper has the advantages of high efficiency and high bonding strength.

scholarly journals A fast and simple bonding method for low cost microfluidic chip fabrication

2018 ◽  
Vol 69 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Zhifu Yin ◽  
Helin Zou
Keyword(s):  
Microfluidic Chip ◽  
Low Cost ◽  
Adhesive Tape ◽  
Microfluidic Chips ◽  
Bonding Pressure ◽  
Gas Leakage ◽  
Microstructure Fabrication ◽  
Chip Fabrication ◽  
Commercial Applications ◽  
Bonding Method

Abstract With the development of the microstructure fabrication technique, microfluidic chips are widely used in biological and medical researchers. Future advances in their commercial applications depend on the mass bonding of microfluidic chip. In this study we are presenting a simple, low cost and fast way of bonding microfluidic chips at room temperature. The influence of the bonding pressure on the deformation of the microchannel and adhesive tape was analyzed by numerical simulation. By this method, the microfluidic chip can be fully sealed at low temperature and pressure without using any equipment. The dye water and gas leakage test indicated that the microfluidic chip can be bonded without leakage or block and its bonding strength can up to 0.84 MPa.

Effect of Joule Heat on Hydrophily of Microchannel

2014 ◽  
Vol 609-610 ◽  
pp. 606-610
Author(s):  
Xiao Wei Han ◽  
Xiao Wei Liu ◽  
Li Tian ◽  
He Zhang ◽  
Yao Liu ◽  
...  
Keyword(s):  
Transfer Coefficient ◽  
Polymethyl Methacrylate ◽  
Microfluidic Chip ◽  
Room Temperature ◽  
Joule Heat ◽  
Microfluidic Chips ◽  
Interior Surface

We discuss the effect of joule heat which comes from eletroosmosis flow on the microfluidic chip. Our microfluidic chips are fabricated from polymethyl methacrylate (PMMA). As everyone knows, PMMA is a poor conductor of heat, and its transfer coefficient is only 0.19W/m·K in room temperature. So, the heat is generated by eletroosmosis canʼt conduct outside the microchannels of microfluidic chip easily. We research the effect joule heat on walls of microchannels which are made of PMMA. During our study, interior surface of microchannelsʼ hydrophobicity is changed by effect of joule heat.

THE STUDY ON TA VAT WINE PRODUCTION FROM SUGAR PALM (ARENGA PINNATA) SAP

2014 ◽  
Vol 83 (5) ◽  
Author(s):  
Nguyễn Thị Hồng Thu ◽  
Đặng Minh Nhật ◽  
Nguyễn Hoàng Dung
Keyword(s):  
Room Temperature ◽  
Fermentation Process ◽  
Inoculum Size ◽  
Wine Fermentation ◽  
Wine Production ◽  
Factors Affecting ◽  
Natural Fermentation ◽  
Tropical Asia ◽  
Best Parameters

Sugar palm (Arenga pinnata) is a feather palm native to tropical Asia. In Vietnam, it is named Búng Báng or Đoác and grown only on the highlands in the central or northern part of Vietnam. It is utilized for many purposes, especially for Ta Vat wine production - a characteristic and unique product of Co Tu ethnic minority. However, because of the natural fermentation used in the production, the product quality is inconsistent. The purpose of this study was to examine a new procedure of using palm sap for making Ta Vat wine. Some characteristics of the sap, which was collected at Nam Giang district, Quang Nam province are determined, proving the potential of the sap for making wine product. The quality of sap changes quickly at room temperature. At low temperature (4 - 60C), the changes in sap quality are apparently slower. Examining some factors affecting its quality during the wine fermentation process, we determined the best parameters for the fermentation process as follows: inoculum size of 3% with cell density of about 1x108 cells/ml, the addition of the extract from the bark of Ceylon ironwood (Mesua ferrea L.) 4%. Keywords: Arenga pinnata, sap, Ceylon ironwood bark, Mesua ferrea L., wine fermentation.

scholarly journals In vitro characteristics and in vivo platelet quality of whole blood treated with riboflavin and UVA / UVB light and stored for 24 hours at room temperature

Transfusion ◽  
2021 ◽  
Vol 61 (S1) ◽  
Author(s):  
Turid Helen Felli Lunde ◽  
Lindsay Hartson ◽  
Shawn Lawrence Bailey ◽  
Tor Audun Hervig
Keyword(s):  
Whole Blood ◽  
Room Temperature
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