NAMS 2002 Workshop - ICOM 2008

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after cleaning. Both hydraulic and chemical cleaning resulted in an unexpectedly large flux improvement. In order to determine whether or not the modification changed the basic membranes structure, both morphological and surface characterizations by FTIR were conducted and the results confirmed the stability of the co-polymer. Measuring the contact angle showed an improvement in hydrophilicity after the fouling studies, which may have caused the flux improvement. Another objective of this study was to accomplish lysis of bacterial cells to further reduce the likelihood of bacterial growth on the membranes. Fluorescence microscopic investigations showed that interactions on the surface of the AETMA modified membrane surface damaged the bacterial cells. These AETMA modified PES membranes when compared with acrylic acid modified ones with the same extent of modification, perform better in terms of permeate flux, recovery, and anti-bacterial activity.
Membrane Fouling III - RO & Biofouling – 4 Thursday July 17, 4:00 PM-4:30 PM, Maui Role of Seawater Chemistry in Algal Biopolymer Fouling of Seawater RO Membranes X. Jin (Speaker), University of California Los Angeles, Los Angeles, California, USA - jinxuesky@ucla.edu E. Hoek, University of California Los Angeles, Los Angeles, California, USA A major fouling concern in seawater reverse osmosis (SWRO) plants is the increased biomass generated during algal blooms. Algae, bacteria, and their exudates are present in high concentrations, and thus, have the potential to foul RO membranes. Although, membrane fouling by colloids and dissolved organics has been studied extensively for brackish and wastewater applications, fouling behavior may be very different in seawater due to the high ionic strength and suppression of electrical double layer interactions. We hypothesize that short- range interfacial interactions will play a critical role in determining the rate and extent of SWRO membrane fouling and that seawater chemistry will strongly impact foulant-membrane interfacial interactions. As a first step towards understanding the role of seawater chemistry in SWRO membrane fouling, we have conducted a study of SWRO membrane fouling by algal biopolymers. Commercially available SWRO membranes - FilmTec SWHR (Dow Chemicals, Minneapolis, MN) and SWC3+ (Hydranautics, Oceanside, CA) - are used as model SWRO membranes. The two membranes were selected because they represent a relatively hydrophobic, rough membrane with significant carboxylic acid functionality at its interface (Hydranautics SWC3+) and a relatively hydrophilic, smooth membrane with relatively little carboxylic acid functionality at its interface (FilmTec SWHR). The former is expected to be more fouling prone due to attractive acid-base interactions and its rough, carboxylic acid rich interface. The latter membrane is expected to be relatively resistant to fouling due to repulsive acid-base interactions and its relatively smooth, non- carboxylated interface. Accelerated fouling experiments are carried out in a bench-scale SWRO simulator with 6 parallel flat-sheet membrane cells. Alginic acid - an acidic hetero-polysaccharide excreted by Brown algae - is spiked into synthetic seawater solutions with constant total dissolved solid (TDS) concentrations of 32 g/L, but varied concentrations of major cations (e.g., sodium, magnesium, calcium). In addition, a real seawater matrix (Instant Ocean®) was also evaluated. Water flux and conductivity rejection are tracked with time. At the end of fouling experiments, cleaning is performed first using laboratory de-ionized (DI) water, followed by a 5 mM EDTA solution adjusted to pH 11 by NaOH
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ICOM 2008 Oral Presentation Proceed
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Professor Yoram Cohen Professor Joh
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ICOM 2008 Staff: The University of
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ICOM 2008 Workshop Schedule: Saturd
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Monday, July 14 - Afternoon Session
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Tuesday, July 15 - Afternoon Sessio
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8:15AM 8:35AM EMS Barrer Prize (Mau
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Friday, July 18 - Morning Sessions
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Oral Presentation Abstracts Morning
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Gas Separation I - 1 - Keynote Mond
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esulting permeability selectivity o
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chain packing. To ensure a well pha
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Gas Separation I - 5 Monday July 14
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satisfactory way the corresponding
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Drinking and Wastewater Application
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an adjusted water management in the
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prospect for new energy sources as
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oxygen removal to the desired pH. C
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(Cl - , SO4 2- , As(V)) and water t
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[1] R. Lima de Miranda, J. Kruse, K
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Polymeric Membranes I - 4 Monday Ju
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Polymeric Membranes I - 5 Monday Ju
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Biomedical and Biotechnology I - 1
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Acknowledgments The Authors acknowl
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isolation of CD34+ cells was achiev
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membranes were then challenged with
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in crossflow mode operation were in
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hydroxide. For Mg/Ca = 0, the fouli
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improvement of filterability also t
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scale where fouling rates are commo
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observed in two subsequence phenome
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Membrane Modeling I - Fundamental A
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Membrane Modeling I - Fundamental A
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of the impact of the operating para
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Oral Presentation Abstracts Afterno
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Hybrid and Novel Processes I - 2 Mo
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Arora, M.B., J.A. Hestekin, S.W. Sn
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Conclusions Reverse electrodialysis
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energy recovery. This is a remarkab
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eaction with mediator due to the co
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Nanofiltration and Reverse Osmosis
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4.3x10 -6 to 7.4x10 -6 cm 2 /s. Bas
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The development of these membranes
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permeability, defined as water perm
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supports including charged (PSF/SPE
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[4] L. M. Robeson, Journal of Membr
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y conventional polymers and provide
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[3] P.M. Budd, K.J. Msayib, C.E. Ta
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Nanostructured Membranes I - 5 Mond
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Fuel Cells I - 1 Monday July 14, 2:
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investigated at first. As a result,
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Desalination I - 2 Monday July 14,
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Composite Polymeric Membrane Format
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NAMS Alan S. Michaels Award - 1a Tu
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NAMS Alan S. Michaels Award - 2 Tue
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opportunities for improving membran
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NAMS Alan S. Michaels Award - 4b Tu
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[4] K. Vanherck et al. Accepted for
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accumulation had a strong effect on
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and, if so, to develop correlations
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non-porous and porous membranes are
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[2] Palmeri, J., Sandeaux, R. Sande
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fouling. Information obtained from
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This work performed under the auspi
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etween Ru(bi-pyridine)3 2+ and meth
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[1] M. Barboiu, C. Luca, C. Guizard
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Nanostructured Membranes II - 5 Tue
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Nanostructured Membranes II - 6 Tue
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than 10 nm. XRD data suggest that t
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Pervaporation and Vapor Permeation
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ethanol/butanol (non solvent) combi
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forward osmosis, the RO process is
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Osmotically Driven Membrane Process
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References: [1] Stupp, S. I.; Lebon
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temperatures might bring about the
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References [1] S. Benita, Microenca
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solvent, were investigated (where a
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ease of manipulation as this allows
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Horizontal shrinkage does not have
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Absorption of water was determined
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Gas Separation II - 1 - Keynote Tue
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Gas Separation II - 2 Tuesday July
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concentration. These results are co
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Gas Separation II - 5 Tuesday July
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will be shown that homogeneous film
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which can adsorb on the surface of
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were collected, the viable bacteria
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pressure, and permporosimetry with
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Inorganic Membranes I - 3 Tuesday J
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Membrane Fouling - UF & Water Treat
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Membrane Modeling II - Gas Separati
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[10] Wang BG, Lv HL, Yang JC. Chem
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Membrane and Surface Modification I
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Gas Separation III - 1 - Keynote We
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Gas Separation III - 2 Wednesday Ju
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separation was next blended with di
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Polymeric Membranes II - 1 - Keynot
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Polymeric Membranes II - 3 Wednesda
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5. Erdodi, G.; Kennedy, J. P.; Prog
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observed for different locations in
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Biomedical and Biotechnology II - 3
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applied in the first two fields wil
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distribution of SBMA units within t
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5500 ppm (15 mM) was lowered to 30
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increasing the effective size of th
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etween 0 and 1), the automatic feed
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Membrane Modeling III - Process Sim
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Membrane Modeling III - Process Sim
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models developed suggests that ther
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start level has a huge impact on th
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Ultra- and Microfiltration I - Tran
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all three binary protein UF systems
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Synthetic solutions of ±-lactalbum
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Gas Separation IV - 2 Thursday July
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6. T. C. Merkel, Z. He, I. Pinnau,
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EMS Barrer Prize - 1b Thursday July
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EMS Barrer Prize - 3 Thursday July
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EMS Barrer Prize - 4b Thursday July
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EMS Barrer Prize - 5 Thursday July
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therapy options have been modelled
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Ultra- and Microfiltration II - Pro
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in the vicinity of the rising bubbl
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Page 397 and 398: 5. Conclusion In this work, the evo
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Page 407 and 408: References Arora, M.B., J.A. Hestek
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elative contributions of Fickian di
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Gas Separation V - 4 Friday July 18
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Gas Separation V - 6 Friday July 18
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Electron Microscopy (TEM) analyses
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- Hybrid RO train: A hybrid RO trai
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concentration as well as on the sod
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scaling deposits in the DCMD device
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Silica colloidal solution with diff
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Membrane Fouling IV - RO & Desalina
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Polyacrylonitrile (PAN) UF membrane
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the polymer dope was PEI (12 wt%),
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Inorganic Membranes III - 1 - Keyno
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Inorganic Membranes III - 2 Friday
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CO2/H2 selectivity at high temperat
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ammonia complexes in aqueous soluti
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possible to have a membrane capable
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fired boiler flue gas, SOx and merc
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EPR/Ago/p-benzoquinone composite sh
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elated to the presence of free elec
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surroundings. When the temperature
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that no absorbent was detected in t
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days of filtration from 120 to 7-10
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was performed to restore membrane f
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with the SRT of 65 days, no correla
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Results Critical flux measurements
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MLSS is not directly proportional t
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Fuel Cells III - 2 Friday July 18,
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Fuel Cells III - 4 Friday July 18,
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Ultra- and Microfiltration III - Me
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can be deduced from the imaginary p
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membranes. The analysis of the ligh
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Membrane Contactors - 2 Friday July
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absorption liquid in the pores of t
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Packaging and Barrier Materials - 1
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Historically, all the approaches de
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