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Park I, Kim S, Brenden CK, Shi W, Iyer H, Bashir R, Vlasov Y. Highly Localized Chemical Sampling at Subsecond Temporal Resolution Enabled with a Silicon Nanodialysis Platform at Nanoliter per Minute Flows. ACS NANO 2024; 18:6963-6974. [PMID: 38378186 PMCID: PMC10919076 DOI: 10.1021/acsnano.3c09776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 02/06/2024] [Accepted: 02/08/2024] [Indexed: 02/22/2024]
Abstract
Microdialysis (MD) is a versatile and powerful technique for chemical profiling of biological tissues and is widely used for quantification of neurotransmitters, neuropeptides, metabolites, biomarkers, and drugs in the central nervous system as well as in dermatology, ophthalmology, and pain research. However, MD performance is severely limited by fundamental tradeoffs between chemical sensitivity, spatial resolution, and temporal response. Here, by using wafer-scale silicon microfabrication, we develop and demonstrate a nanodialysis (ND) sampling probe that enables highly localized chemical sampling with 100 μm spatial resolution and subsecond temporal resolution at high recovery rates. These performance metrics, which are 100-1000× superior to existing MD approaches, are enabled by a 100× reduction of the microfluidic channel cross-section, a corresponding drastic 100× reduction of flow rates to exceedingly slow few nL/min flows, and integration of a nanometer-thin nanoporous membrane with high transport flux into the probe sampling area. Miniaturized ND probes may allow for the minimally invasive and highly localized sampling and chemical profiling in live biological tissues with high spatiotemporal resolution for clinical, biomedical, and pharmaceutical applications.
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Affiliation(s)
| | | | | | - Weihua Shi
- University of Illinois at
Urbana−Champaign, Urbana, Illinois 61820, United States
| | - Hrishikesh Iyer
- University of Illinois at
Urbana−Champaign, Urbana, Illinois 61820, United States
| | - Rashid Bashir
- University of Illinois at
Urbana−Champaign, Urbana, Illinois 61820, United States
| | - Yurii Vlasov
- University of Illinois at
Urbana−Champaign, Urbana, Illinois 61820, United States
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2
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Song J, Shen Q, Shao H, Deng X. Anti-Environmental Aging Passive Daytime Radiative Cooling. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305664. [PMID: 38148594 PMCID: PMC10933639 DOI: 10.1002/advs.202305664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 10/30/2023] [Indexed: 12/28/2023]
Abstract
Passive daytime radiative cooling technology presents a sustainable solution for combating global warming and accompanying extreme weather, with great potential for diverse applications. The key characteristics of this cooling technology are the ability to reflect most sunlight and radiate heat through the atmospheric transparency window. However, the required high solar reflectance is easily affected by environmental aging, rendering the cooling ineffective. In recent years, significant advancements have been made in understanding the failure mechanisms, design strategies, and manufacturing technologies of daytime radiative cooling. Herein, a critical review on anti-environmental aging passive daytime radiative cooling with the goal of advancing their commercial applications is presented. It is first introduced the optical mechanisms and optimization principles of radiative cooling, which serve as a basis for further endowing environmental durability. Then the environmental aging conditions of passive daytime radiative cooling, mainly focusing on UV exposure, thermal aging, surface contamination and chemical corrosion are discussed. Furthermore, the developments of anti-environmental aging passive daytime radiative cooling materials, including design strategies, fabrication techniques, structures, and performances, are reviewed and classified for the first time. Last but not the least, the remaining open challenges and the insights are presented for the further promotion of the commercialization progress.
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Affiliation(s)
- Jianing Song
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054China
| | - Qingchen Shen
- Bio‐inspired Photonics GroupYusuf Hamied Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - Huijuan Shao
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054China
| | - Xu Deng
- Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu610054China
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3
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Park I, Kim S, Brenden CK, Shi W, Iyer H, Bashir R, Vlasov Y. Highly localized chemical sampling at sub-second temporal resolution enabled with a silicon nanodialysis platform at exceedingly slow flows. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.08.556607. [PMID: 37745310 PMCID: PMC10515758 DOI: 10.1101/2023.09.08.556607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Microdialysis (MD) is a versatile and powerful technique for chemical profiling of biological tissues and is widely used for quantification of neurotransmitters, neuropeptides, metabolites, biomarkers, and drugs in the central nervous system as well as in dermatology, ophthalmology, and in pain research. However, MD performance is severely limited by fundamental tradeoffs between chemical sensitivity, spatial resolution, and temporal response. Here, by using wafer-scale silicon microfabrication, we develop and demonstrate a nanodialysis (ND) sampling probe that enables highly localized chemical sampling with 100μm spatial resolution and sub-second temporal resolution at high recovery rates. These performance metrics, which are 100X-1000X superior to existing MD approaches, are enabled by a 100X reduction of the microfluidic channel cross-section, a corresponding drastic 100X reduction of flow rates to exceedingly slow few nL/min flows, and integration of a nanometer-thin nanoporous membrane with high transport flux into the probe sampling area. Miniaturized ND probes may allow for the minimally invasive and highly localized sampling and chemical profiling in live biological tissues with unprecedented spatio-temporal resolution for clinical, biomedical, and pharmaceutical applications.
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4
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Moyer J, Wilson MW, Sorrentino TA, Santandreu A, Chen C, Hu D, Kerdok A, Porock E, Wright N, Ly J, Blaha C, Frassetto LA, Fissell WH, Vartanian SM, Roy S. Renal Embolization-Induced Uremic Swine Model for Assessment of Next-Generation Implantable Hemodialyzers. Toxins (Basel) 2023; 15:547. [PMID: 37755973 PMCID: PMC10536310 DOI: 10.3390/toxins15090547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 08/22/2023] [Accepted: 08/30/2023] [Indexed: 09/28/2023] Open
Abstract
Reliable models of renal failure in large animals are critical to the successful translation of the next generation of renal replacement therapies (RRT) into humans. While models exist for the induction of renal failure, none are optimized for the implantation of devices to the retroperitoneal vasculature. We successfully piloted an embolization-to-implantation protocol enabling the first implant of a silicon nanopore membrane hemodialyzer (SNMHD) in a swine renal failure model. Renal arterial embolization is a non-invasive approach to near-total nephrectomy that preserves retroperitoneal anatomy for device implants. Silicon nanopore membranes (SNM) are efficient blood-compatible membranes that enable novel approaches to RRT. Yucatan minipigs underwent staged bilateral renal arterial embolization to induce renal failure, managed by intermittent hemodialysis. A small-scale arteriovenous SNMHD prototype was implanted into the retroperitoneum. Dialysate catheters were tunneled externally for connection to a dialysate recirculation pump. SNMHD clearance was determined by intermittent sampling of recirculating dialysate. Creatinine and urea clearance through the SNMHD were 76-105 mL/min/m2 and 140-165 mL/min/m2, respectively, without albumin leakage. Normalized creatinine and urea clearance measured in the SNMHD may translate to a fully implantable clinical-scale device. This pilot study establishes a path toward therapeutic testing of the clinical-scale SNMHD and other implantable RRT devices.
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Affiliation(s)
- Jarrett Moyer
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Mark W. Wilson
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Thomas A. Sorrentino
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Ana Santandreu
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Caressa Chen
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Dean Hu
- Outset Medical, San Jose, CA 95134, USA
| | | | - Edward Porock
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Nathan Wright
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Jimmy Ly
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Charles Blaha
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Lynda A. Frassetto
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - William H. Fissell
- Silicon Kidney, San Ramon, CA 94583, USA
- Division of Nephrology & Hypertension, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Shant M. Vartanian
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Shuvo Roy
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
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Huang SH, Parandhaman M, Farnia S, Kim J, Amemiya S. Nanoelectrochemistry at liquid/liquid interfaces for analytical, biological, and material applications. Chem Commun (Camb) 2023; 59:9575-9590. [PMID: 37458703 PMCID: PMC10416082 DOI: 10.1039/d3cc01982a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
Herein, we feature our recent efforts toward the development and application of nanoelectrochemistry at liquid/liquid interfaces, which are also known as interfaces between two immiscible electrolyte solutions (ITIES). Nanopipets, nanopores, and nanoemulsions are developed to create the nanoscale ITIES for the quantitative electrochemical measurement of ion transfer, electron transfer, and molecular transport across the interface. The nanoscale ITIES serves as an electrochemical nanosensor to enable the selective detection of various ions and molecules as well as high-resolution chemical imaging based on scanning electrochemical microscopy. The powerful nanoelectroanalytical methods will be useful for biological and material applications as illustrated by in situ studies of solid-state nanopores, nuclear pore complexes, living bacteria, and advanced nanoemulsions. These studies provide unprecedented insights into the chemical reactivity of important biological and material systems even at the single nanostructure level.
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Affiliation(s)
- Siao-Han Huang
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
| | | | - Solaleh Farnia
- Department of Chemistry, University of Rhode Island, Kingston, RI, 02881, USA.
| | - Jiyeon Kim
- Department of Chemistry, University of Rhode Island, Kingston, RI, 02881, USA.
| | - Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
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Lucas K, Oh J, Hoelzl J, Weissleder R. Cellular point-of-care diagnostics using an inexpensive layer-stack microfluidic device. LAB ON A CHIP 2022; 22:2145-2154. [PMID: 35514273 PMCID: PMC9214713 DOI: 10.1039/d2lc00162d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Cellular analyses are increasingly used to diagnose diseases at point-of-care and global healthcare settings. Some analyses are simple as they rely on chromogenic stains (blood counts, malaria) but others often require higher multiplexing to define and quantitate cell populations (cancer diagnosis, immunoprofiling). Simplifying the latter with inexpensive solutions represents a current bottleneck in designing start-end pipelines. Based on the hypothesis that novel film adhesives could be used to create inexpensive disposable devices, we tested a number of different designs and materials, to rapidly perform 12-15 channel single-cell imaging. Using an optimized passive pumping layer-stack microfluidic (PLASMIC) device (<1 $ in supplies) we show that rapid, inexpensive cellular analysis is feasible.
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Affiliation(s)
- Kilean Lucas
- Center for Systems Biology, Massachusetts General Hospital, 185 Cambridge St, CPZN 5206, Boston, MA 02114, USA.
| | - Juhyun Oh
- Center for Systems Biology, Massachusetts General Hospital, 185 Cambridge St, CPZN 5206, Boston, MA 02114, USA.
| | - Jan Hoelzl
- Center for Systems Biology, Massachusetts General Hospital, 185 Cambridge St, CPZN 5206, Boston, MA 02114, USA.
| | - Ralph Weissleder
- Center for Systems Biology, Massachusetts General Hospital, 185 Cambridge St, CPZN 5206, Boston, MA 02114, USA.
- Department of Systems Biology, Harvard Medical School, 200 Longwood Ave, Boston, MA 02115, USA
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Lucas K, Dehghani M, Khire T, Gaborski T, Flax JD, Waugh RE, McGrath JL. A predictive model of nanoparticle capture on ultrathin nanoporous membranes. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Ghosh A, Vallam Thodi F, Sengupta S, Kannan S, Krishnan L, Bhattacharya E. Effective clearance of uremic toxins using functionalised silicon Nanoporous membranes. Biomed Microdevices 2021; 23:4. [PMID: 33415531 DOI: 10.1007/s10544-020-00539-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/26/2020] [Indexed: 12/24/2022]
Abstract
In-house fabricated silicon nanoporous membranes (SNMs), functionalized for efficient clearance of uremic toxins, can lead to compact and portable dialysis systems. Efficacy of 15 nm thick SNMs, with average pore diameter of 8 nm, was tested for dialysis of two uremic toxins - urea and creatinine using custom made teflon apparatus of 2, 10 and 30 ml. The apparatus consisted of two reservoirs, with the cis containing the uremic fluid, and the trans containing the dialysate. Peristalsis was found to enhance the clearance rate by a factor of four as compared to unstirred condition. Functionalisation of the SNMs reduced protein binding, and surface binding of urea from 23% to negligible values. A lateral array of nine SNMs and a new design for the dialysis apparatus, increased the clearance rate by a factor of twelve from that of the single SNM. The arrays cleared about 42% of urea and 48% of creatinine from 30 ml of diluted serum samples, in 15 min. Periodic replacement of the trans fluid cleared about 81% of high concentration uremic toxins from the cis reservoir in 45 mins. The SNM arrays are stable, reproducible, and with the superior clearance rates for urea and creatinine, they have the potential to be used as membranes for portable hemodialysers.
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Affiliation(s)
- Ananya Ghosh
- Department of Electrical Engineering, Indian Institute of Technology-Madras, Chennai, 600036, India
| | - Fidal Vallam Thodi
- Centre for NEMS and Nanophotonics, Indian Institute of Technology-Madras, Chennai, 600036, India
| | - Sudeshna Sengupta
- Centre for NEMS and Nanophotonics, Indian Institute of Technology-Madras, Chennai, 600036, India
| | - Sivasundari Kannan
- Department of Electrical Engineering, Indian Institute of Technology-Madras, Chennai, 600036, India
| | - Lalitha Krishnan
- Centre for NEMS and Nanophotonics, Indian Institute of Technology-Madras, Chennai, 600036, India
| | - Enakshi Bhattacharya
- Department of Electrical Engineering, Indian Institute of Technology-Madras, Chennai, 600036, India. .,Centre for NEMS and Nanophotonics, Indian Institute of Technology-Madras, Chennai, 600036, India.
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Madejski GR, Ahmad SD, Musgrave J, Flax J, Madejski JG, Rowley DA, DeLouise LA, Berger AJ, Knox WH, McGrath JL. Silicon Nanomembrane Filtration and Imaging for the Evaluation of Microplastic Entrainment along a Municipal Water Delivery Route. SUSTAINABILITY 2020; 12:10655. [PMID: 36938128 PMCID: PMC10022737 DOI: 10.3390/su122410655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
To better understand the origin of microplastics in municipal drinking water, we evaluated 50 mL water samples from different stages of the City of Rochester's drinking water production and transport route, from Hemlock Lake to the University of Rochester. We directly filtered samples using silicon nitride nanomembrane filters with precisely patterned slit-shaped pores, capturing many of the smallest particulates (<20 μm) that could be absorbed by the human body. We employed machine learning algorithms to quantify the shapes and quantity of debris at different stages of the water transport process, while automatically segregating out fibrous structures from particulate. Particulate concentrations ranged from 13 to 720 particles/mL at different stages of the water transport process and fibrous pollution ranged from 0.4 to 8.3 fibers/mL. A subset of the debris (0.2-8.6%) stained positively with Nile red dye which identifies them as hydrophobic polymers. Further spectroscopic analysis also indicated the presence of many non-plastic particulates, including rust, silicates, and calcium scale. While water leaving the Hemlock Lake facility is mostly devoid of debris, transport through many miles of piping results in the entrainment of a significant amount of debris, including plastics, although in-route reservoirs and end-stage filtration serve to reduce these concentrations.
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Affiliation(s)
- Gregory R. Madejski
- 306 Goergen Hall, Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
- Correspondence: (G.R.M.); (J.L.M.); Tel.: +1-585-460-3113 (G.R.M.); +1-585-273-5489 (J.L.M.)
| | - S. Danial Ahmad
- 306 Goergen Hall, Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
| | - Jonathan Musgrave
- 508 Goergen Hall, The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
| | - Jonathan Flax
- 306 Goergen Hall, Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
| | - Joseph G. Madejski
- 306 Goergen Hall, Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
| | - David A. Rowley
- Rochester Water Bureau, 7412 Rix Hill Rd, Hemlock, NY 14466, USA
| | - Lisa A. DeLouise
- 306 Goergen Hall, Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
- Department of Dermatology, University of Rochester Medical Center, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Andrew J. Berger
- 405 Goergen Hall, The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
| | - Wayne H. Knox
- 508 Goergen Hall, The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
| | - James L. McGrath
- 306 Goergen Hall, Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
- Correspondence: (G.R.M.); (J.L.M.); Tel.: +1-585-460-3113 (G.R.M.); +1-585-273-5489 (J.L.M.)
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Miller JJ, Carter JA, Hill K, DesOrmeaux JPS, Carter RN, Gaborski TR, Roussie JA, McGrath JL, Johnson DG. Free Standing, Large-Area Silicon Nitride Membranes for High Toxin Clearance in Blood Surrogate for Small-Format Hemodialysis. MEMBRANES 2020; 10:membranes10060119. [PMID: 32517263 PMCID: PMC7344517 DOI: 10.3390/membranes10060119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/04/2020] [Accepted: 06/04/2020] [Indexed: 06/11/2023]
Abstract
Developing highly-efficient membranes for toxin clearance in small-format hemodialysis presents a fabrication challenge. The miniaturization of fluidics and controls has been the focus of current work on hemodialysis (HD) devices. This approach has not addressed the membrane efficiency needed for toxin clearance in small-format hemodialysis devices. Dr. Willem Kolff built the first dialyzer in 1943 and many changes have been made to HD technology since then. However, conventional HD still uses large instruments with bulky dialysis cartridges made of ~2 m2 of 10 micron thick, tortuous-path membrane material. Portable, wearable, and implantable HD systems may improve clinical outcomes for patients with end-stage renal disease by increasing the frequency of dialysis. The ability of ultrathin silicon-based sheet membranes to clear toxins is tested along with an analytical model predicting long-term multi-pass experiments from single-pass clearance experiments. Advanced fabrication methods are introduced that produce a new type of nanoporous silicon nitride sheet membrane that features the pore sizes needed for middle-weight toxin removal. Benchtop clearance results with sheet membranes (~3 cm2) match a theoretical model and indicate that sheet membranes can reduce (by orders of magnitude) the amount of membrane material required for hemodialysis. This provides the performance needed for small-format hemodialysis.
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Affiliation(s)
- Joshua J. Miller
- SiMPore, Inc. 150 Lucius Gordon Drive, Suite 110, West Henrietta, NY 14586, USA; (J.J.M.); (J.A.C.); (J.-P.S.D.); (J.A.R.)
| | - Jared A. Carter
- SiMPore, Inc. 150 Lucius Gordon Drive, Suite 110, West Henrietta, NY 14586, USA; (J.J.M.); (J.A.C.); (J.-P.S.D.); (J.A.R.)
| | - Kayli Hill
- Biomedical Engineering Department, University of Rochester, Rochester, NY 14627, USA; (K.H.); (J.L.M.)
| | - Jon-Paul S. DesOrmeaux
- SiMPore, Inc. 150 Lucius Gordon Drive, Suite 110, West Henrietta, NY 14586, USA; (J.J.M.); (J.A.C.); (J.-P.S.D.); (J.A.R.)
| | - Robert N. Carter
- Mechanical Engineering Department, Rochester Institute of Technology, Rochester, NY 14623, USA;
| | - Thomas R. Gaborski
- Biomedical Engineering Department, Rochester Institute of Technology, Rochester, NY 14623, USA;
| | - James A. Roussie
- SiMPore, Inc. 150 Lucius Gordon Drive, Suite 110, West Henrietta, NY 14586, USA; (J.J.M.); (J.A.C.); (J.-P.S.D.); (J.A.R.)
| | - James L. McGrath
- Biomedical Engineering Department, University of Rochester, Rochester, NY 14627, USA; (K.H.); (J.L.M.)
| | - Dean G. Johnson
- Biomedical Engineering Department, University of Rochester, Rochester, NY 14627, USA; (K.H.); (J.L.M.)
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11
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Luo J, Fan JB, Wang S. Recent Progress of Microfluidic Devices for Hemodialysis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1904076. [PMID: 31535786 DOI: 10.1002/smll.201904076] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 08/31/2019] [Indexed: 06/10/2023]
Abstract
Microfluidic hemodialysis techniques have recently attracted great attention in the treatment of kidney disease due to their advantages of portability and wearability as well as their great potential for replacing clinical hospital-centered blood purification with continuous in-home hemodialysis. This Review summarizes the recent progress in microfluidic devices for hemodialysis. First, the history of kidney-inspired hemodialysis is introduced. Then, recent achievements in the preparation of microfluidic devices and hemodialysis nanoporous membrane materials are presented and categorized. Subsequently, attention is drawn to the recent progress of nanoporous membrane-based microfluidic devices for hemodialysis. Finally, the challenges and opportunities of hemodialysis microfluidic devices in the future are also discussed. This Review is expected to provide a comprehensive guide for the design of hemodialysis microfluidic devices that are closely related to clinical applications.
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Affiliation(s)
- Jing Luo
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jun-Bing Fan
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Shutao Wang
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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12
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Hill K, Walker SN, Salminen A, Chung HL, Li X, Ezzat B, Miller JJ, DesOrmeaux JPS, Zhang J, Hayden A, Burgin T, Piraino L, May MN, Gaborski TR, Roussie JA, Taylor J, DiVincenti L, Shestopalov AA, McGrath JL, Johnson DG. Second Generation Nanoporous Silicon Nitride Membranes for High Toxin Clearance and Small Format Hemodialysis. Adv Healthc Mater 2020; 9:e1900750. [PMID: 31943849 PMCID: PMC7041421 DOI: 10.1002/adhm.201900750] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 11/15/2019] [Indexed: 12/13/2022]
Abstract
Conventional hemodialysis (HD) uses floor-standing instruments and bulky dialysis cartridges containing ≈2 m2 of 10 micrometer thick, tortuous-path membranes. Portable and wearable HD systems can improve outcomes for patients with end-stage renal disease by facilitating more frequent, longer dialysis at home, providing more physiological toxin clearance. Developing devices with these benefits requires highly efficient membranes to clear clinically relevant toxins in small formats. Here, the ability of ultrathin (<100 nm) silicon-nitride-based membranes to reduce the membrane area required to clear toxins by orders of magnitude is shown. Advanced fabrication methods are introduced that produce nanoporous silicon nitride membranes (NPN-O) that are two times stronger than the original nanoporous nitride materials (NPN) and feature pore sizes appropriate for middle-weight serum toxin removal. Single-pass benchtop studies with NPN-O (1.4 mm2 ) demonstrate the extraordinary clearance potential of these membranes (105 mL min-1 m-2 ), and their intrinsic hemocompatibility. Results of benchtop studies with nanomembranes, and 4 h dialysis of uremic rats, indicate that NPN-O can reduce the membrane area required for hemodialysis by two orders of magnitude, suggesting the performance and robustness needed to enable small-format hemodialysis, a milestone in the development of small-format hemodialysis systems.
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Affiliation(s)
- Kayli Hill
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Samuel N Walker
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Alec Salminen
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Hung L Chung
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Xunzhi Li
- Department of Chemical Engineering, University of Rochester, Rochester, NY, 14627, USA
| | - Bahie Ezzat
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Joshua J Miller
- SiMPore, Inc., 150 Lucius Gordon Drive, Suite 110, West Henrietta, Henrietta, NY, 14586, USA
| | - Jon-Paul S DesOrmeaux
- SiMPore, Inc., 150 Lucius Gordon Drive, Suite 110, West Henrietta, Henrietta, NY, 14586, USA
| | - Jingkai Zhang
- The Institute of Optics, University of Rochester, Rochester, NY, 14627, USA
| | - Andrew Hayden
- SiMPore, Inc., 150 Lucius Gordon Drive, Suite 110, West Henrietta, Henrietta, NY, 14586, USA
| | - Tucker Burgin
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Lindsay Piraino
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Marina N May
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Thomas R Gaborski
- Biomedical Engineering Department, Rochester Institute of Technology, Rochester, NY, 14623, USA
| | - James A Roussie
- SiMPore, Inc., 150 Lucius Gordon Drive, Suite 110, West Henrietta, Henrietta, NY, 14586, USA
| | - Jeremy Taylor
- Department of Nephrology, University of Rochester, Rochester, NY, 14627, USA
| | - Louis DiVincenti
- Department of Comparative Medicine, University of Rochester, Rochester, NY, 14627, USA
| | | | - James L McGrath
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
| | - Dean G Johnson
- Biomedical Engineering Department, University of Rochester, Rochester, NY, 14627, USA
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13
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Khire TS, Salminen AT, Swamy H, Lucas KS, McCloskey MC, Ajalik RE, Chung HH, Gaborski TR, Waugh RE, Glading AJ, McGrath JL. Microvascular Mimetics for the Study of Leukocyte-Endothelial Interactions. Cell Mol Bioeng 2020; 13:125-139. [PMID: 32175026 DOI: 10.1007/s12195-020-00611-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 01/24/2020] [Indexed: 02/06/2023] Open
Abstract
Introduction The pathophysiological increase in microvascular permeability plays a well-known role in the onset and progression of diseases like sepsis and atherosclerosis. However, how interactions between neutrophils and the endothelium alter vessel permeability is often debated. Methods In this study, we introduce a microfluidic, silicon-membrane enabled vascular mimetic (μSiM-MVM) for investigating the role of neutrophils in inflammation-associated microvascular permeability. In utilizing optically transparent silicon nanomembrane technology, we build on previous microvascular models by enabling in situ observations of neutrophil-endothelium interactions. To evaluate the effects of neutrophil transmigration on microvascular model permeability, we established and validated electrical (transendothelial electrical resistance and impedance) and small molecule permeability assays that allow for the in situ quantification of temporal changes in endothelium junctional integrity. Results Analysis of neutrophil-expressed β1 integrins revealed a prominent role of neutrophil transmigration and basement membrane interactions in increased microvascular permeability. By utilizing blocking antibodies specific to the β1 subunit, we found that the observed increase in microvascular permeability due to neutrophil transmigration is constrained when neutrophil-basement membrane interactions are blocked. Having demonstrated the value of in situ measurements of small molecule permeability, we then developed and validated a quantitative framework that can be used to interpret barrier permeability for comparisons to conventional Transwell™ values. Conclusions Overall, our results demonstrate the potential of the μSiM-MVM in elucidating mechanisms involved in the pathogenesis of inflammatory disease, and provide evidence for a role for neutrophils in inflammation-associated endothelial barrier disruption.
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Affiliation(s)
- Tejas S Khire
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA
| | - Alec T Salminen
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA
| | - Harsha Swamy
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14627 USA
| | - Kilean S Lucas
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA
| | - Molly C McCloskey
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA
| | - Raquel E Ajalik
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA
| | - Henry H Chung
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY 14623 USA
| | - Thomas R Gaborski
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA.,Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY 14623 USA
| | - Richard E Waugh
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA
| | - Angela J Glading
- Department of Pharmacology and Physiology, University of Rochester, Rochester, NY 14627 USA
| | - James L McGrath
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627 USA
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14
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Dang BV, Taylor RA, Charlton AJ, Le-Clech P, Barber TJ. Toward Portable Artificial Kidneys: The Role of Advanced Microfluidics and Membrane Technologies in Implantable Systems. IEEE Rev Biomed Eng 2020; 13:261-279. [DOI: 10.1109/rbme.2019.2933339] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Dehghani M, Lucas K, Flax J, McGrath J, Gaborski T. Tangential flow microfluidics for the capture and release of nanoparticles and extracellular vesicles on conventional and ultrathin membranes. ADVANCED MATERIALS TECHNOLOGIES 2019; 4:1900539. [PMID: 32395607 PMCID: PMC7212937 DOI: 10.1002/admt.201900539] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Indexed: 05/04/2023]
Abstract
Membranes have been used extensively for the purification and separation of biological species. A persistent challenge is the purification of species from concentrated feed solutions such as extracellular vesicles (EVs) from biological fluids. We investigated a new method to isolate micro- and nano-scale species termed tangential flow for analyte capture (TFAC), which is an extension of traditional tangential flow filtration (TFF). Initially, EV purification from plasma on ultrathin nanomembranes was compared between both normal flow filtration (NFF) and TFAC. NFF resulted in rapid formation of a protein cake which completely obscured any captured EVs and also prevented further transport across the membrane. On the other hand, TFAC showed capture of CD63 positive small EVs (sEVs) with minimal contamination. We explored the use of TFAC to capture target species over membrane pores, wash and then release in a physical process that does not rely upon affinity or chemical interactions. This process of TFAC was studied with model particles on both ultrathin nanomembranes and conventional thickness membranes (polycarbonate track-etch). Successful capture and release of model particles was observed using both membranes. Ultrathin nanomembranes showed higher efficiency of capture and release with significantly lower pressures indicating that ultrathin nanomembranes are well-suited for TFAC of delicate nanoscale particles such as EVs.
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Affiliation(s)
- Mehdi Dehghani
- Department of Microsystems Engineering, Rochester Institute of Technology, Rochester, NY, United States
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, United States
| | - Kilean Lucas
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, United States
| | - Jonathan Flax
- Department of Urology, University of Rochester Medical School, Rochester, NY, United States
| | - James McGrath
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, United States
| | - Thomas Gaborski
- Department of Microsystems Engineering, Rochester Institute of Technology, Rochester, NY, United States
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, United States
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, United States
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16
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Masters EA, Salminen AT, Begolo S, Luke EN, Barrett SC, Overby CT, Gill AL, de Mesy Bentley KL, Awad HA, Gill SR, Schwarz EM, McGrath JL. An in vitro platform for elucidating the molecular genetics of S. aureus invasion of the osteocyte lacuno-canalicular network during chronic osteomyelitis. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2019; 21:102039. [PMID: 31247310 DOI: 10.1016/j.nano.2019.102039] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 06/11/2019] [Accepted: 06/11/2019] [Indexed: 11/30/2022]
Abstract
Staphylococcus aureus osteomyelitis is a devasting disease that often leads to amputation. Recent findings have shown that S. aureus is capable of invading the osteocyte lacuno-canalicular network (OLCN) of cortical bone during chronic osteomyelitis. Normally a 1 μm non-motile cocci, S. aureus deforms smaller than 0.5 μm in the sub-micron channels of the OLCN. Here we present the μSiM-CA (Microfluidic - Silicon Membrane - Canalicular Array) as an in vitro screening platform for the genetic mechanisms of S. aureus invasion. The μSiM-CA platform features an ultrathin silicon membrane with defined pores that mimic the openings of canaliculi. While we anticipated that S. aureus lacking the accessory gene regulator (agr) quorum-sensing system would not be capable of invading the OLCN, we found no differences in propagation compared to wild type in the μSiM-CA. However the μSiM-CA proved predictive as we also found that the agr mutant strain invaded the OLCN of murine tibiae.
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Affiliation(s)
- Elysia A Masters
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY; Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY
| | - Alec T Salminen
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY
| | | | - Emma N Luke
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY
| | - Sydney C Barrett
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY
| | - Clyde T Overby
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY; Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY
| | - Ann Lindley Gill
- Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY
| | - Karen L de Mesy Bentley
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY; Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY; Department of Orthopaedics, University of Rochester Medical Center, Rochester, NY
| | - Hani A Awad
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY; Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY
| | - Steven R Gill
- Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY
| | - Edward M Schwarz
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY; Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY; Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY; Department of Orthopaedics, University of Rochester Medical Center, Rochester, NY
| | - James L McGrath
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY.
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Vertical Alignment of Size-Controlled Self-Assembled Diphenylalanine Peptide Nanotubes Using Polyethersulfone Hollow Fiber Membranes On Silicon. Int J Pept Res Ther 2019. [DOI: 10.1007/s10989-018-9725-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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18
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Wróblewska-Krepsztul J, Rydzkowski T, Michalska-Pożoga I, Thakur VK. Biopolymers for Biomedical and Pharmaceutical Applications: Recent Advances and Overview of Alginate Electrospinning. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E404. [PMID: 30857370 PMCID: PMC6473949 DOI: 10.3390/nano9030404] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/19/2019] [Accepted: 03/06/2019] [Indexed: 12/20/2022]
Abstract
Innovative solutions using biopolymer-based materials made of several constituents seems to be particularly attractive for packaging in biomedical and pharmaceutical applications. In this direction, some progress has been made in extending use of the electrospinning process towards fiber formation based on biopolymers and organic compounds for the preparation of novel packaging materials. Electrospinning can be used to create nanofiber mats characterized by high purity of the material, which can be used to create active and modern biomedical and pharmaceutical packaging. Intelligent medical and biomedical packaging with the use of polymers is a broadly and rapidly growing field of interest for industries and academia. Among various polymers, alginate has found many applications in the food sector, biomedicine, and packaging. For example, in drug delivery systems, a mesh made of nanofibres produced by the electrospinning method is highly desired. Electrospinning for biomedicine is based on the use of biopolymers and natural substances, along with the combination of drugs (such as naproxen, sulfikoxazol) and essential oils with antibacterial properties (such as tocopherol, eugenol). This is a striking method due to the ability of producing nanoscale materials and structures of exceptional quality, allowing the substances to be encapsulated and the drugs/ biologically active substances placed on polymer nanofibers. So, in this article we briefly summarize the recent advances on electrospinning of biopolymers with particular emphasis on usage of Alginate for biomedical and pharmaceutical applications.
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Affiliation(s)
- Jolanta Wróblewska-Krepsztul
- Department of Mechanical Engineering, Koszalin University of Technology, Raclawicka 15-17, Koszalin 75-620, Poland.
| | - Tomasz Rydzkowski
- Department of Mechanical Engineering, Koszalin University of Technology, Raclawicka 15-17, Koszalin 75-620, Poland.
| | - Iwona Michalska-Pożoga
- Department of Mechanical Engineering, Koszalin University of Technology, Raclawicka 15-17, Koszalin 75-620, Poland.
| | - Vijay Kumar Thakur
- Enhanced Composites and Structures Center, School of Aerospace, Transport and Manufacturing, Cranfield University, Bedfordshire, MK43 0AL, UK.
- Department of Mechanical Engineering, School of Engineering, Shiv Nadar University, Uttar Pradesh, 201314, India.
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19
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Salminen AT, Zhang J, Madejski GR, Khire TS, Waugh RE, McGrath JL, Gaborski TR. Ultrathin Dual-Scale Nano- and Microporous Membranes for Vascular Transmigration Models. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1804111. [PMID: 30632319 PMCID: PMC6530565 DOI: 10.1002/smll.201804111] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/26/2018] [Indexed: 05/21/2023]
Abstract
Selective cellular transmigration across the microvascular endothelium regulates innate and adaptive immune responses, stem cell localization, and cancer cell metastasis. Integration of traditional microporous membranes into microfluidic vascular models permits the rapid assay of transmigration events but suffers from poor reproduction of the cell permeable basement membrane. Current microporous membranes in these systems have large nonporous regions between micropores that inhibit cell communication and nutrient exchange on the basolateral surface reducing their physiological relevance. Here, the use of 100 nm thick continuously nanoporous silicon nitride membranes as a base substrate for lithographic fabrication of 3 µm pores is presented, resulting in a highly porous (≈30%), dual-scale nano- and microporous membrane for use in an improved vascular transmigration model. Ultrathin membranes are patterned using a precision laser writer for cost-effective, rapid micropore design iterations. The optically transparent dual-scale membranes enable complete observation of leukocyte egress across a variety of pore densities. A maximal density of ≈14 micropores per cell is discovered beyond which cell-substrate interactions are compromised giving rise to endothelial cell losses under flow. Addition of a subluminal extracellular matrix rescues cell adhesion, allowing for the creation of shear-primed endothelial barrier models on nearly 30% continuously porous substrates.
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Affiliation(s)
- Alec T Salminen
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14627, USA
| | - Jingkai Zhang
- Institute of Optics, University of Rochester, Rochester, NY, 14627, USA
| | - Gregory R Madejski
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14627, USA
| | - Tejas S Khire
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14627, USA
| | - Richard E Waugh
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14627, USA
| | - James L McGrath
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14627, USA
| | - Thomas R Gaborski
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14627, USA
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, USA
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20
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Salminen A, Hill K, Henry Chung L, James McGrath L, Johnson DG. Protein Separation and Hemocompatibility of Nitride Membranes in Microfluidic Filtration Systems. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2018:5814-5817. [PMID: 30441657 PMCID: PMC6241304 DOI: 10.1109/embc.2018.8513538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Improving the health outcomes for end-stage renal Disease (ESRD) patients on hemodialysis (HD) requires new technologies for wearable HD such as a highly efficient membrane that can achieve standard toxic clearance rates in small device footprints. Our group has developed nanoporous silicon nitride (NPN) membranes which are 100 to 1000 times thinner than conventional membranes and are orders-ofmagnitude more efficient for dialysis. Counter flow dialysis separation experiments were performed to measure urea clearance while microdialysis experiments were performed in a stirred beaker to measure the separation of cytochrome-c and albumin. Hemodialysis experiments testing for platelet activation as well as protein adhesion were performed. Devices for the counter flow experiments were constructed with polydimethylsiloxane (PDMS) and a NPN membrane chip. The counter flow devices reduced the urea by as much as 20%. The microdialysis experiments showed a diffusion of ~ 60% for the cytochrome-c while clearing ~ 20% of the Albumin. Initial hemocompatibility studies show that the NPN membrane surface is less prone to both protein adhesion and platelet activation when compared to positive control (glass).
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21
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Berzina B, Anand RK. An Electrokinetic Separation Route to Source Dialysate from Excess Fluid in Blood. Anal Chem 2018; 90:3720-3726. [DOI: 10.1021/acs.analchem.7b02584] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Beatrise Berzina
- Department of Chemistry, College of Liberal Arts and Sciences, Iowa State University of Science and Technology, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Robbyn K. Anand
- Department of Chemistry, College of Liberal Arts and Sciences, Iowa State University of Science and Technology, 1605 Gilman Hall, Ames, Iowa 50011, United States
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22
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Abstract
Silicon nanomembranes are ultrathin, highly permeable, optically transparent and biocompatible substrates for the construction of barrier tissue models. Trans-epithelial/endothelial electrical resistance (TEER) is often used as a non-invasive, sensitive and quantitative technique to assess barrier function. The current study characterizes the electrical behavior of devices featuring silicon nanomembranes to facilitate their application in TEER studies. In conventional practice with commercial systems, raw resistance values are multiplied by the area of the membrane supporting cell growth to normalize TEER measurements. We demonstrate that under most circumstances, this multiplication does not 'normalize' TEER values as is assumed, and that the assumption is worse if applied to nanomembrane chips with a limited active area. To compare the TEER values from nanomembrane devices to those obtained from conventional polymer track-etched (TE) membranes, we develop finite element models (FEM) of the electrical behavior of the two membrane systems. Using FEM and parallel cell-culture experiments on both types of membranes, we successfully model the evolution of resistance values during the growth of endothelial monolayers. Further, by exploring the relationship between the models we develop a 'correction' function, which when applied to nanomembrane TEER, maps to experiments on conventional TE membranes. In summary, our work advances the the utility of silicon nanomembranes as substrates for barrier tissue models by developing an interpretation of TEER values compatible with conventional systems.
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23
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Smith KJ, May M, Baltus R, McGrath JL. A predictive model of separations in dead-end filtration with ultrathin membranes. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.07.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Mireles M, Gaborski TR. Fabrication techniques enabling ultrathin nanostructured membranes for separations. Electrophoresis 2017; 38:2374-2388. [PMID: 28524241 PMCID: PMC5909070 DOI: 10.1002/elps.201700114] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 05/01/2017] [Accepted: 05/11/2017] [Indexed: 11/09/2022]
Abstract
The fabrication of nanostructured materials is an area of continuous improvement and innovative techniques that fulfill the demand of many fields of research and development. The continuously decreasing size of the smallest patternable feature has expanded the catalog of methods enabling the fabrication of nanostructured materials. Several of these nanofabrication techniques have sprouted from applications requiring nanoporous membranes such as molecular separations, cell culture, and plasmonics. This review summarizes methods that successfully produce through-pores in ultrathin films exhibiting an approximate pore size to thickness ratio of one, which has been shown to be beneficial due to high permeability and improved separation potential. The material reviewed includes large-area, parallel, and affordable approaches such as self-organizing polymers, nanosphere lithography, anodization, nanoimprint lithography as well as others such as solid phase crystallization and nanosphere lens lithography. The aim of this review is to provide a set of inexpensive fabrication techniques to produce nanostructured materials exhibiting pores ranging from 10 to 350 nm and a pore size to thickness ratio close to one. The fabrication methods described in this work have reported the successful manufacture of nanoporous membranes exhibiting the ideal characteristics to improve selectivity and permeability when applied as separation media in ultrafiltration.
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Affiliation(s)
- Marcela Mireles
- Biomedical Engineering Department, Rochester Institute of Technology, Rochester, NY, USA
| | - Thomas R Gaborski
- Biomedical Engineering Department, Rochester Institute of Technology, Rochester, NY, USA
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25
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Li X, Johnson D, Ma W, Chung H, Getpreecharsawas J, McGrath JL, Shestopalov AA. Modification of Nanoporous Silicon Nitride with Stable and Functional Organic Monolayers. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2017; 29:2294-2302. [PMID: 29651199 PMCID: PMC5892436 DOI: 10.1021/acs.chemmater.6b05392] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
This study describes the formation of functional organic monolayers on thin, nanoporous silicon nitride membranes. We demonstrate that the vapor-phase carbene insertion into the surface C-H bonds can be used to form sub-5 nm molecular coatings on nanoporous materials, which can be further modified with monolayers of polyethylene glycol (PEG) molecules. We investigate composition, thickness, and stability of the functionalized monolayers and the changes in the membrane permeability and pore size distribution. We show that, due to the low coating thickness (~7 nm), the functionalized membrane retains 80% of the original gas permeance and 40% of the original hydraulic permeability. We also show that the carbene/PEG functionalization is hydrolytically stable for up to 48 h of exposure to water and that it can suppress nonspecific adsorption of the proteins BSA and IgG. Our results suggest that the vapor-phase carbenylation can be used as a complementary technology to the traditional self-assembly and polymer brush chemistries in chemical functionalization of nanoporous materials, which are limited in their ability to serve as stable coatings that do not occlude nanomembrane pores.
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Affiliation(s)
- Xunzhi Li
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Dean Johnson
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Wenchuan Ma
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Henry Chung
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Jirachai Getpreecharsawas
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - James L. McGrath
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627, United States
- Corresponding Authors: .
| | - Alexander A. Shestopalov
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States
- Corresponding Authors: .
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26
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Preliminary Diffusive Clearance of Silicon Nanopore Membranes in a Parallel Plate Configuration for Renal Replacement Therapy. ASAIO J 2016; 62:169-75. [PMID: 26692401 DOI: 10.1097/mat.0000000000000311] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Silicon nanopore membranes (SNMs) with compact geometry and uniform pore size distribution have demonstrated a remarkable capacity for hemofiltration. These advantages could potentially be used for hemodialysis. Here, we present an initial evaluation of the SNM's mechanical robustness, diffusive clearance, and hemocompatibility in a parallel plate configuration. Mechanical robustness of the SNM was demonstrated by exposing membranes to high flows (200 ml/min) and pressures (1,448 mm Hg). Diffusive clearance was performed in an albumin solution and whole blood with blood and dialysate flow rates of 25 ml/min. Hemocompatibility was evaluated using scanning electron microscopy and immunohistochemistry after 4 hours in an extracorporeal porcine model. The pressure drop across the flow cell was 4.6 mm Hg at 200 ml/min. Mechanical testing showed that SNM could withstand up to 775.7 mm Hg without fracture. Urea clearance did not show an appreciable decline in blood versus albumin solution. Extracorporeal studies showed blood was successfully driven via the arterial-venous pressure differential without thrombus formation. Bare silicon showed increased cell adhesion with a 4.1-fold increase and 1.8-fold increase over polyethylene glycol (PEG)-coated surfaces for tissue plasminogen factor (t-PA) and platelet adhesion (CD41), respectively. These initial results warrant further design and development of a fully scaled SNM-based parallel plate dialyzer for renal replacement therapy.
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27
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Johnson DG, Pan S, Hayden A, McGrath JL. Nanoporous membrane robustness / stability in small form factor microfluidic filtration system. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2016:1955-1958. [PMID: 28268711 PMCID: PMC6390479 DOI: 10.1109/embc.2016.7591106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The development of wearable hemodialysis (HD) devices that replace center-based HD holds the promise to improve both outcomes and quality-of-life for patients with end-stage-renal disease (ERD). A prerequisite for these devices is the development of highly efficient membranes that can achieve high toxin clearance in small footprints. The ultrathin nanoporous membrane material developed by our group is orders of magnitude more permeable than conventional HD membranes. We report on our progress making a prototype wearable dialysis unit. First, we present data from benchtop studies confirming that clinical levels of urea clearance can be obtained in a small animal model with low blood flow rates. Second, we report on efforts to improve the mechanical robustness of high membrane area dialysis devices.
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Affiliation(s)
- Dean G. Johnson
- Biomedical Engineering Department, University of Rochester, NY 14623 USA (585-273-2156; )
| | - Sabrina Pan
- Biomedical Engineering Department, University of Rochester, NY 14623 USA
| | | | - James L. McGrath
- Biomedical Engineering Department, University of Rochester, NY 14623 USA
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28
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Kim S, Feinberg B, Kant R, Chui B, Goldman K, Park J, Moses W, Blaha C, Iqbal Z, Chow C, Wright N, Fissell WH, Zydney A, Roy S. Diffusive Silicon Nanopore Membranes for Hemodialysis Applications. PLoS One 2016; 11:e0159526. [PMID: 27438878 PMCID: PMC4954641 DOI: 10.1371/journal.pone.0159526] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 07/04/2016] [Indexed: 11/18/2022] Open
Abstract
Hemodialysis using hollow-fiber membranes provides life-sustaining treatment for nearly 2 million patients worldwide with end stage renal disease (ESRD). However, patients on hemodialysis have worse long-term outcomes compared to kidney transplant or other chronic illnesses. Additionally, the underlying membrane technology of polymer hollow-fiber membranes has not fundamentally changed in over four decades. Therefore, we have proposed a fundamentally different approach using microelectromechanical systems (MEMS) fabrication techniques to create thin-flat sheets of silicon-based membranes for implantable or portable hemodialysis applications. The silicon nanopore membranes (SNM) have biomimetic slit-pore geometry and uniform pores size distribution that allow for exceptional permeability and selectivity. A quantitative diffusion model identified structural limits to diffusive solute transport and motivated a new microfabrication technique to create SNM with enhanced diffusive transport. We performed in vitro testing and extracorporeal testing in pigs on prototype membranes with an effective surface area of 2.52 cm2 and 2.02 cm2, respectively. The diffusive clearance was a two-fold improvement in with the new microfabrication technique and was consistent with our mathematical model. These results establish the feasibility of using SNM for hemodialysis applications with additional scale-up.
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Affiliation(s)
- Steven Kim
- Division of Nephrology, University of California San Francisco, San Francisco, California, United States of America
| | - Benjamin Feinberg
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Rishi Kant
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Benjamin Chui
- Ben Chui Consulting, Sunnyvale, California, United States of America
| | - Ken Goldman
- H-Cubed, Olmsted Falls, Ohio, United States of America
| | - Jaehyun Park
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Willieford Moses
- Department of Surgery, University of California San Francisco, San Francisco, California, United States of America
| | - Charles Blaha
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Silicon Kidney, LLC, San Francisco, California, United States of America
| | - Zohora Iqbal
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Clarence Chow
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Nathan Wright
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Silicon Kidney, LLC, San Francisco, California, United States of America
| | - William H. Fissell
- Silicon Kidney, LLC, San Francisco, California, United States of America
- Division of Nephrology & Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Andrew Zydney
- Department of Chemical Engineering, Pennsylvania State University, State College, Pennsylvania, United States of America
| | - Shuvo Roy
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Silicon Kidney, LLC, San Francisco, California, United States of America
- * E-mail:
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Burgin T, Johnson D, Chung H, Clark A, McGrath J. Analytical and Finite Element Modeling of Nanomembranes for Miniaturized, Continuous Hemodialysis. MEMBRANES 2015; 6:membranes6010006. [PMID: 26729179 PMCID: PMC4812412 DOI: 10.3390/membranes6010006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 12/28/2015] [Accepted: 12/28/2015] [Indexed: 11/24/2022]
Abstract
Hemodialysis involves large, periodic treatment doses using large-area membranes. If the permeability of dialysis membranes could be increased, it would reduce the necessary dialyzer size and could enable a wearable device that administers a continuous, low dose treatment of chronic kidney disease. This paper explores the application of ultrathin silicon membranes to this purpose, by way of analytical and finite element models of diffusive and convective transport of plasma solutes during hemodialysis, which we show to be predictive of experimental results. A proof-of-concept miniature nanomembrane dialyzer design is then proposed and analytically predicted to clear uremic toxins at near-ideal levels, as measured by several markers of dialysis adequacy. This work suggests the feasibility of miniature nanomembrane-based dialyzers that achieve therapeutic levels of uremic toxin clearance for patients with kidney failure.
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Affiliation(s)
- Tucker Burgin
- Department of Biomedical Engineering, University of Rochester, 252 Elmwood Ave, Rochester, NY 14627, USA.
| | - Dean Johnson
- Department of Biomedical Engineering, University of Rochester, 252 Elmwood Ave, Rochester, NY 14627, USA.
| | - Henry Chung
- Department of Biomedical Engineering, University of Rochester, 252 Elmwood Ave, Rochester, NY 14627, USA.
| | - Alfred Clark
- Department of Mechanical Engineering, University of Rochester, 252 Elmwood Ave, Rochester, NY 14627, USA.
| | - James McGrath
- Department of Biomedical Engineering, University of Rochester, 252 Elmwood Ave, Rochester, NY 14627, USA.
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31
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Delachat F, Constancias C, Fournel F, Morales C, Le Drogoff B, Chaker M, Margot J. Fabrication of buckling free ultrathin silicon membranes by direct bonding with thermal difference. ACS NANO 2015; 9:3654-3663. [PMID: 25789462 DOI: 10.1021/acsnano.5b00234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An innovative method to fabricate large area (up to several squared millimeters) ultrathin (100 nm) monocrystalline silicon (Si) membranes is described. This process is based on the direct bonding of a silicon-on-insulator wafer with a preperforated silicon wafer. The stress generated by the thermal difference applied during the bonding process is exploited to produce buckling free silicon nanomembranes of large areas. The thermal differences required to achieve these membranes (≥1 mm(2)) are estimated by analytical calculations. An experimental study of the stress achievable by direct bonding through two specific surface preparations (hydrophobic or hydrophilic) is reported. Buckling free silicon nanomembranes secured on a 2 × 2 cm(2) frame with lateral dimensions up to 5 × 5 mm(2) are successfully fabricated using the optimized direct bonding process. The stress estimated by theoretical analysis is confirmed by Raman measurements, while the flatness of the nanomembranes is demonstrated by optical interferometry. The successful fabrications of high resolution (50 nm half pitch) tungsten gratings on the silicon nanomembranes and of focused ion beam milling nanostructures show the promising potential of the Si membranes for X-ray optics and for the emerging nanosensor market.
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Affiliation(s)
- Florian Delachat
- †Université de Montréal, C.P. 6128, Montréal, Québec H3C 3J7, Canada
- ‡CEA-LETI, 17 rue des Martyrs, Grenoble F-38054, France
| | | | - Frank Fournel
- ‡CEA-LETI, 17 rue des Martyrs, Grenoble F-38054, France
| | | | - Boris Le Drogoff
- §INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - Mohamed Chaker
- §INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - Joelle Margot
- †Université de Montréal, C.P. 6128, Montréal, Québec H3C 3J7, Canada
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32
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Qi C, Striemer CC, Gaborski TR, McGrath JL, Fauchet PM. Influence of silicon dioxide capping layers on pore characteristics in nanocrystalline silicon membranes. NANOTECHNOLOGY 2015; 26:055706. [PMID: 25590751 DOI: 10.1088/0957-4484/26/5/055706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Porous nanocrystalline silicon (pnc-Si) membranes are a new class of membrane material with promising applications in biological separations. Pores are formed in a silicon film sandwiched between nm thick silicon dioxide layers during rapid thermal annealing. Controlling pore size is critical in the size-dependent separation applications. In this work, we systematically studied the influence of the silicon dioxide capping layers on pnc-Si membranes. Even a single nm thick top oxide layer is enough to switch from agglomeration to pore formation after annealing. Both the pore size and porosity increase with the thickness of the top oxide, but quickly reach a plateau after 10 nm of oxide. The bottom oxide layer acts as a barrier layer to prevent the a-Si film from undergoing homo-epitaxial growth during annealing. Both the pore size and porosity decrease as the thickness of the bottom oxide layer increases to 100 nm. The decrease of the pore size and porosity is correlated with the increased roughness of the bottom oxide layer, which hinders nanocrystal nucleation and nanopore formation.
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Affiliation(s)
- Chengzhu Qi
- Materials Science Program, University of Rochester, Rochester, NY 14627, USA. Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA
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DesOrmeaux JPS, Winans JD, Wayson SE, Gaborski TR, Khire TS, Striemer CC, McGrath JL. Nanoporous silicon nitride membranes fabricated from porous nanocrystalline silicon templates. NANOSCALE 2014; 6:10798-10805. [PMID: 25105590 DOI: 10.1039/c4nr03070b] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The extraordinary permeability and manufacturability of ultrathin silicon-based membranes are enabling devices with improved performance and smaller sizes in such important areas as molecular filtration and sensing, cell culture, electroosmotic pumping, and hemodialysis. Because of the robust chemical and mechanical properties of silicon nitride (SiN), several laboratories have developed techniques for patterning nanopores in SiN using reactive ion etching (RIE) through a template structure. These methods however, have failed to produce pores small enough for ultrafiltration (<100 nm) in SiN and involve templates that are prone to microporous defects. Here we present a facile, wafer-scale method to produce nanoporous silicon nitride (NPN) membranes using porous nanocrystalline silicon (pnc-Si) as a self-assembling, defect free, RIE masking layer. By modifying the mask layer morphology and the RIE etch conditions, the pore sizes of NPN can be adjusted between 40 nm and 80 nm with porosities reaching 40%. The resulting NPN membranes exhibit higher burst pressures than pnc-Si membranes while having 5× greater permeability. NPN membranes also demonstrate the capacity for high resolution separations (<10 nm) seen previously with pnc-Si membranes. We further demonstrate that human endothelial cells can be grown on NPN membranes, verifying the biocompatibility of NPN and demonstrating the potential of this material for cell culture applications.
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Chung HH, Chan CK, Khire TS, Marsh GA, Clark A, Waugh RE, McGrath JL. Highly permeable silicon membranes for shear free chemotaxis and rapid cell labeling. LAB ON A CHIP 2014; 14:2456-68. [PMID: 24850320 PMCID: PMC4540053 DOI: 10.1039/c4lc00326h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Microfluidic systems are powerful tools for cell biology studies because they enable the precise addition and removal of solutes in small volumes. However, the fluid forces inherent in the use of microfluidics for cell cultures are sometimes undesirable. An important example is chemotaxis systems where fluid flow creates well-defined and steady chemotactic gradients but also pushes cells downstream. Here we demonstrate a chemotaxis system in which two chambers are separated by a molecularly thin (15 nm), transparent, and nanoporous silicon membrane. One chamber is a microfluidic channel that carries a flow-generated gradient while the other chamber is a shear-free environment for cell observation. The molecularly thin membranes provide effectively no resistance to molecular diffusion between the two chambers, making them ideal elements for creating flow-free chambers in microfluidic systems. Analytical and computational flow models that account for membrane and chamber geometry, predict shear reduction of more than five orders of magnitude. This prediction is confirmed by observing the pure diffusion of nanoparticles in the cell-hosting chamber despite high input flow (Q = 10 μL min(-1); vavg ~ 45 mm min(-1)) in the flow chamber only 15 nm away. Using total internal reflection fluorescence (TIRF) microscopy, we show that a flow-generated molecular gradient will pass through the membrane into the quiescent cell chamber. Finally we demonstrate that our device allows us to expose migrating neutrophils to a chemotactic gradient or fluorescent label without any influence from flow.
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Affiliation(s)
- Henry H Chung
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, USA.
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