scholarly journals Extraction of Soil Solution into a Microfluidic Chip

2021 ◽  
Vol 3 (4) ◽  
pp. 783-796
Author(s):  
Sönke Böckmann ◽  
Igor Titov ◽  
Martina Gerken
Keyword(s):  
Soil Moisture ◽  
Soil Solution ◽  
Microfluidic Chip ◽  
Porous Ceramic ◽  
Microfluidic Channel ◽  
Water Extraction ◽  
Ceramic Filter ◽  
Garden Soil ◽  
Oxide Ceramic ◽  
Lab On Chip

Collecting real-time data on physical and chemical parameters of the soil is a prerequisite for resource-efficient and environmentally sustainable agriculture. For continuous in situ measurement of soil nutrients such as nitrate or phosphate, a lab-on-chip approach combined with wireless remote readout is promising. For this purpose, the soil solution, i.e., the water in the soil with nutrients, needs to be extracted into a microfluidic chip. Here, we present a soil-solution extraction unit based on combining a porous ceramic filter with a microfluidic channel with a 12 µL volume. The microfluidic chip was fabricated from polydimethylsiloxane, had a size of 1.7 cm × 1.7 cm × 0.6 cm, and was bonded to a glass substrate. A hydrophilic aluminum oxide ceramic with approximately 37 Vol.-% porosity and an average pore size of 1 µm was integrated at the inlet. Soil water was extracted successfully from three types of soil—silt, garden soil, and sand—by creating suction with a pump at the other end of the microfluidic channel. For garden soil, the extraction rate at approximately 15 Vol.-% soil moisture was 1.4 µL/min. The amount of extracted water was investigated for 30 min pump intervals for the three soil types at different moisture levels. For garden soil and sand, water extraction started at around 10 Vol.-% soil moisture. Silt showed the highest water-holding capacity, with water extraction starting at approximately 13 Vol.-%.

scholarly journals Design Methodology of Passive In-Line Relays for Molecular Communication in Flow-Induced Microfluidic Channel

Biosensors ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 65
Author(s):  
Puneet Manocha ◽  
Gitanjali Chandwani
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Microfluidic Channel ◽  
Microfluidic Channels ◽  
Molecular Communication ◽  
External Energy ◽  
Lab On Chip ◽  
Molecular Communication Systems ◽  
Macro Scale ◽  
On Chip

Molecular communication is a bioinspired communication that enables macro-scale, micro-scale and nano-scale devices to communicate with each other. The molecular communication system is prone to severe signal attenuation, dispersion and delay, which leads to performance degradation as the distance between two communicating devices increases. To mitigate these challenges, relays are used to establish reliable communication in microfluidic channels. Relay assisted molecular communication systems can also enable interconnection among various entities of the lab-on-chip for sharing information. Various relaying schemes have been proposed for reliable molecular communication systems, most of which lack practical feasibility. Thus, it is essential to design and develop relays that can be practically incorporated into the microfluidic channel. This paper presents a novel design of passive in-line relay for molecular communication system that can be easily embedded in the microfluidic channel and operate without external energy. Results show that geometric modification in the microfluidic channel can act as a relay and restore the degraded signal up-to 28%.

Microfluidic Channel Fabrication With Tailored Wall Roughness

2012 ◽  
Author(s):  
Jing Ren ◽  
Sriram Sundararajan
Keyword(s):  
Flow Behavior ◽  
Surface Texturing ◽  
Microfluidic Channel ◽  
Dip Coating ◽  
Etch Depth ◽  
Wall Roughness ◽  
Random Surface ◽  
Lab On Chip ◽  
On Chip ◽  
Autocorrelation Length

Realistic random roughness of channel surfaces is known to affect the fluid flow behavior in microscale fluidic devices. This has relevance particularly for applications involving non-Newtonian fluids, such as biomedical lab-on-chip devices. In this study, a surface texturing process was developed and integrated into microfluidic channel fabrication. The process combines colloidal masking and Reactive Ion Etching (RIE) for generating random surfaces with desired roughness parameters on the micro/nanoscale. The surface texturing process was shown to be able to tailor the random surface roughness on quartz. A Large range of particle coverage (around 6% to 67%) was achieved using dip coating and drop casting methods using a polystyrene colloidal solution. A relation between the amplitude roughness, autocorrelation length, etch depth and particle coverage of the processed surface was built. Experimental results agreed reasonably well with model predictions. The processed substrate was further incorporated into microchannel fabrication. Final device with designed wall roughness was tested and proved a satisfying sealing performance.

Study on the Manufacture of Microfluidic Chip with Coated Glass

2012 ◽  
Vol 548 ◽  
pp. 254-257 ◽  
Author(s):  
Yan He ◽  
Bai Ling Huang ◽  
Yong Lai Zhang ◽  
Li Gang Niu
Keyword(s):  
Microfluidic Chip ◽  
Low Cost ◽  
Microfluidic Channel ◽  
Critical Factor ◽  
Wet Etching ◽  
Microfluidic Chips ◽  
Etching Technique ◽  
Chip Quality ◽  
Wet Chemical ◽  
Wet Chemical Etching

In this paper, a simple and facile technique for manufacturing glass-based microfluidic chips was developed. Instead of using expensive dry etching technology, the standard UV lithography and wet chemical etching technique was used to fabricate microchannels on a K9 glass substrate. The fabrication process of microfluidic chip including vacuum evaporation, annealing, lithography, and BHF (HF-NH4F-H2O) wet etching were investigated. Through series experiments, we found that anneal was the critical factor for chip quality. As a representative example, a microfluidic channel with 20 m of depth, and 80 m of width was successfully prepared, and the channel surfaces are quite smooth. These results present a simple, low cost, flexible and easy way to fabricate glass-based microfluidic chips.

DEVELOPMENT OF CONTINUOUS ANTI-SOLVENT RECRYSTALLIZATION METHOD TO PRODUCE CEFTRIAXONE SODIUM NANO CRYSTALS INJECTION USING CERAMIC FILTRATION

2021 ◽  
Vol 74 (9) ◽  
pp. 2323-2336
Author(s):  
Firas Aziz Rahi ◽  
Krar Kadhim Mj
Keyword(s):  
Particle Size ◽  
Water Purification ◽  
Porous Ceramic ◽  
Ceramic Filter ◽  
Dissolution Time ◽  
Mixing Rate ◽  
Ceftriaxone Sodium ◽  
Continuous Recrystallization ◽  
Ceramic Filtration ◽  
Clear Solution

The aim: In this work we developed a method of continuous recrystallization to meet industrial requirements. Materials and methods: Continuous recrystallization method was investigated using porous ceramic filter for water purification with pour size less than 1 μm, that ensures high mixing rate of ethanol and water. Results and conclusions: The results of experiments using crystallization through ceramic filter, gives superior products in particle size, and produced needle shaped ceftriaxone crystals form, that showed significant improvement in dissolution time and obtained ceftriaxone sodium powder to be reconstituted in injectable formula that give clear solution without insoluble microparticles.

From CAD to microfluidic chip within one day: rapid prototyping of lab-on-chip cartridges using generic polymer parts

2020 ◽  
Vol 30 (11) ◽  
pp. 115012 ◽  
Author(s):  
Daniel Podbiel ◽  
Lorenz Boecking ◽  
Hannah Bott ◽  
Julian Kassel ◽  
Daniel Czurratis ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
Microfluidic Chip ◽  
Lab On Chip ◽  
On Chip

Automatic Cell Cutting by High-Precision Microfluidic Control

2011 ◽  
Vol 23 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Akihiko Ichikawa ◽  
◽  
Tamio Tanikawa ◽  
Satoshi Akagi ◽  
Kohtaro Ohba ◽  
...  
Keyword(s):  
High Precision ◽  
Microfluidic Chip ◽  
Microfluidic Channel ◽  
Volume Measurement ◽  
Microchannel Flow ◽  
Syringe Pump ◽  
Animal Cells ◽  
Positioning Control ◽  
System A ◽  
Image Volume

We have developed automated cell cutting by highprecision microfluidic control using a high-response and high-precision syringe pump. A microfluidic chip containing 2 orthogonal microchannels was used for cutting animal cells softened by cytochalasin and aspirated and fixed in 1 microchannel, then a high-velocity microchannel flow was generated from another channel to cut the cell. To control microchannel flow precisely, we made a syringe pump with a minimum flow of 0.35 × 10-3µl/min and response time of 10 ms. The syringe pump was connected to the microfluidic chip by a thin, hard Teflon tube to reduce the pressure transmission delay between the syringe pump and microfluidic channel. A microbead control experiment depending on PI control using the syringe pump was conducted to check the microchannel flow delay. Bovine oocytes softened by cytochalasin were injected into the microfluidic chip and bisected by microscopic image volume measurement. This paper reports the automatic cell cutting strategy and system, a result of microbead positioning control, and a result of automatic cell cutting.

Study on the Water Treatment Properties of the Porous Ceramic Filter Balls Synthesized with Industrial Solid Waste

2013 ◽  
Vol 320 ◽  
pp. 683-687
Author(s):  
Yong Jiang Di ◽  
Bi Jia ◽  
Jun Wang ◽  
Xiao Hong Xu ◽  
Jian Feng Wu
Keyword(s):  
Water Treatment ◽  
Solid Waste ◽  
Quartz Sand ◽  
Porous Ceramic ◽  
Ceramic Filter ◽  
Water Turbidity ◽  
Sand Filter ◽  
Ceramic Ball ◽  
Industrial Solid Waste ◽  
Filter Materials

The porous ceramic filter balls were synthesized with industrial solid waste by ceramic process. The removal efficiency, filtration velocity and turbidity for the water treatment properties of the porous ceramic ball filter materials was studied comparing with that of the quartz sand filter materials. The test result shown that the decontamination efficiency of the porous ceramic ball filter was 5% to 10% high than that of the quartz sand filter. When the water turbidity fluctuated with magnitude about 50%, the changes of final water turbidity was in the range of 5% to 8% through the porous ceramic ball filter. The energy saving efficiency of the porous ceramic ball filter was very significant for the porous ceramic ball filter effectively extend the filtration cycle life.

Sign in / Sign up

Export Citation Format

Share Document