fabrication and properties of ultra-thin films …...0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0...
TRANSCRIPT
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Fabrication and properties of ultra-thin films (nanosheets) as innovative biomaterials
Shinji Takeoka
Dept. Life Science and Medical Bioscience,
Waseda University
polymer chemistry, biomaterials, DDS,
artificial red blood cells, artificial platelets,
molecular assembling science and technology
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Electric devices, Biosensors,
Scaffolds for tissue engineering
(Platforms for surface
modification)
Researches on nanosheets fabricated in a bottom-up way
from a solid substrate
Researches on free-standing nanosheets
Development of novel
nanomaterials
(Well-designed synthetic
polymers and polymer network)
Nanosheet
Solid Substrate
Receptor part
Kunitake et. al., Nature Mater. 2006, 5, 494.
Research background
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Visible Light Black Light
Skin
Adv. Mater. 2007, 19, 3549.
Huge aspect ratio (>106) ・ Small amount ・High flexibility ・ Large
contact area ・Non-covalent adhesion ・Heteromodification ・
Transparency
Meso-scale Size(mm-m order)
Nanosheet
subsrateFree-standing
nanosheet
Free-standing nanosheets for biomedical
applications
Medical Polymers (Biocompatible, Biodegradable)
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Development of various kinds of nanosheets
Micron-sized nanosheets with microtechnology and nanobeads technology
Albumin nanosheet with heterosurfaces, huge nanosheets with microbeads
Colloid Surf. A-Physicochem. Eng. Asp., 318, 184-190 (2008).
Coll. Surf. A-Phys. Eng. Aspects, 334, 28-33 (2009).J. Biomed. Mater. Res. Part A, 89A, 233-241 (2009)..
Cytophobic, cytophilic
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Preparation of the free-standing PLLA and
polysaccharide nanosheets
PVA
SiO2 Wafer
PLLA
Releasing
PLLA Nanosheet
PVA
SiO2 Wafer
Chitosan
Spin-coating assisted layer-by-layer (4500 rpm, 15 s, 10.5 pairs)
Casting
Releasing
Sodium Alginate
Polysaccharide Nanosheet
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Control of the thickness of the polysaccharide
nanosheet by LbL and scooped states
High transparency and smoothness
AFM pictures
0
200
400
600
800
1000
1200
1400
1600
0 50 100 150 200 250 300
Layer pairs (-)
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Polysaccharide nanosheets showing structural colors
Surface morphology scanned by AFM
30.2 + 4.3 nm (10.5 pairs)
Thin film interference theory
Single : orange Double : blue
Triple : green
Structural color change on SiO2 substrate
Colloids and Surface A: Physicochemical and Engineering Aspects, 334, 28-33 (2009).
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Free-standing PLLA nanosheets (4 x 4 cm)
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Evaluation of adhesive property of nanosheets
Scratch tester for thin films(Rhesca Co. Ltd.)
Thin film on a substrate is scanned with a diamond tip by
applying the increasing pressure. The signal of frictional
vibration just after breaking of the nanosheet was detected
as “critical loading”.
Coil
Magnet
Damper
Cantilever
ScratchingDiamond
tip
Microscratch detection part
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Adhesion strength of the nanosheet dramatically increases when the
thickness becomes less than 200 nm with change of the trail.
This would be due to the lowering of the glass transition temperature.
0.00
0.05
0.10
0.15
0.20
0 50 100 150 200Thickness (nm)
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0 250 500 750 1000125015001750Thickness (nm)
172 nm 77 nm
Drawn trail
383 nm
Cut-off trail1482 nm
100 mm
10/20
Adhesion strength of the polysaccharide nanosheet
Surgery, 148, 48-58 (2010).
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Bulge test apparatus
Strain: s = (P x a2)/(4 x h x d)
Stress: e = (2 x d2)/(3 x a2)
Elastic modulus: E = s / e
Syringe pump
Pressure gauge
h
Evaluation of the mechanical strength of nanosheet
Tsukruk et. al., Adv. Funct. Mater. 2005.
AirP
ad
Steel chamber
Nanosheet
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0.0 1.0 2.0 3.0 4.0 5.0
0
20
40
60
80
100
120
PN-35
PN-73
PN-114
Pressure (kPa)
0.000 0.002 0.004 0.006 0.008 0.010
0
10
20
30
40
50
60
70
80
90
PN-35
PN-73
PN-114
Strain (-)
Pressure-Deflection and Stress-Strain curves (f: 1 mm)
of polysaccharide nanosheets
Adv. Func. Mater., 19, 2560-2568 (2009).
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Pressure-Deflection curve (f: 6mm) of the nanosheets
0.0 kPa
2.0 kPa
4.0 kPa
1 mmPressure: P (kPa)
Def
lect
ion
: d
(m
m)
0.0 2.0 3.0 4.0 5.00
200
400
600
800
1000
1200
1.0
1400
0.005Strain: e (-)
Stre
ss: s
(MPa
)
0.0100.0000
40
80
120
E(75 nm): 9.6 + 3.1 GPa
Red line indicates that the nanosheet is well tolerated at the air pressure of
3kPa (30 cmH2O), corresponding to the normal respiratory pressure.
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0 2 4 6 8 1012141618202224262830
0
10
20
30
40
50
60
70
80
90
100
Time (day)
Rem
ain
ing p
erc
enta
ge (
wt%
)
75 nm
41nm
11 days
7 days
T1/2 (41 nm): 7 days, T1/2 (75 nm): 11 days
Degradation of the polysaccharide nanosheets
with different thicknesses
PBS, 37oC
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10 mm
Nanosheet 2 (75nm thickness)
PP mesh (f: 30 mm)
Nanosheet 2 (LbL)
Blood compatibility test
Blood
PP mesh fibers
Adv. Func. Mater., 19, 2560-2568 (2009).
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16
Sealing effect of the polysaccharide nanosheet in a
lung perforation model (canine)
6 mm pleura
Sealed with the
(nanosheet + PVA) filmTissue-defect by punch Nanosheet adhered after
dissolution of PVA
lung
18 mm
Operation for a lung-defected beagle after operation
Adv. Func. Mater., 19, 2560-2568 (2009).
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Nanosheet (Growth of fibroblast)
Histological sections of perforated lesion
(after 1 week)
Fibrin sheet (post-surgical adhesion)(h)
Chest wall
Fibrin sheet
Tissue adhesion
Fibrin sheet is used as a
conventional treatment of
pleural injury/ defect
But causes pleural adhesion.
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Evaluation of PLLA nanosheet patching
to the incision site of mouse stomach
①
②
④
③
⑤
incision (ca. 1 cm)
PLLA nanosheet
stomach
Patching of PLLA/PVA composite film
PLA nanosheet
Dissolution of PVAfilm with PBS
Positive control: 5-6 needle suturing
Negative control: no suturing
PVAPLA nanosheet
Albert-Lembert
suturing
Adv. Mater., 21, 4388-4392 (2009).
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baking
Si wafer
PVA (10wt%)PLA, PLGA solution
Spin coating
Peeling off Dissolution in water
Suspension in water
incision (ca. 1 cm)
PLA nanosheet
stomach
Overlapping of PLLA nanosheeton an incision of stomach and repair (mouse)
Nanosheet overlapping Suturing (5-7 needles)
0
20
40
60
80
100
120
1 70
Surv
ival
rat
io (
%)
Day32 4 65
5-7 needle suturing(N=6)
PLA nanosheet(N=9)
No treatment(N=6)
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Drying
Preparation of a TC layer
Spin-coating of a PVAc layer
PVAc-TC-nanosheet
Removal of substrate
LbL of chitosan and Na alginate(10 pairs, 39 nm)
Preparation of a PVA film by casting Peeling off and inverting the LbL+PVA bilayered film
SiO2 substrate
Chitosan
Na alginatePVA
PVAcTetracycline (TC)
Antibiotic-loaded nanosheets for the treatment
of gastrointestinal tissue defects
Biomaterials, 31, 6269-6278(2010).
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21
250 nmSubstrate
SEM
Sheet
TC
Confocul microscopyOH O
HO
NH2
OOOH
OH
N
OH
Tetracycline (TC) (Ex: 380 nm, Em: 510 nm)
Entry
PVAc-TC-nanosheet
TC-nanosheet
PVAc-nanosheet
Thickness (nm)
177±9
69 ±6
142 ±4
TC (mg/cm2)
6.2±0.5
5.6±0.3
0
ZOI (mm)
7.0±1.7
7.0±1.6
0
PVAc:100nmTC:30 nmNS:40 nm
Structure and function of antibiotic-loaded
nanosheets
ZOI: zone of inhibition
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Needle (18 G)
Cecum
Stress StressNormal saline Nanosheet
Blacklight
Puncture hole
Patch nanosheet
(b)
(a)
(c)
Murine cecal puncture model :
(a) schematic representation
(b) macroscopic images
(c) location of TC under black light
Biomaterials, 31, 6269-6278 (2010).
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Effects of nanosheets
until 7 days after operation, (a) murine survival,
(b) the number of bacteria in the intraperitoneal lavage
(a)
0
20
40
60
80
100
0 1 2 3 4 5 6 7Time (day)
****
0
5
10
15
20
25
30
TC PVAcPVAc-TC
*
(b)
PVAc-TC-nanosheet (n=14)
TC-Nanosheet (n=11)
PVAc-Nanosheet (n=11)
Without nanosheet (n=5)
nanosheet
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NOTES (Natural Orifice Transluminal Endoscopic Surgery), access to the target organs through holes made in stomach/ vagina /lung wall, etc.
Iron oxide nanoparticles-loaded nanosheet for
endoluminal surgery (with SSSA@IIT)
Non invasive, flexible, efficient methods for hole
closing are requested because current techniques
show many limitations
24Silvia et al., Langmuir, 27, 5589–5595 (2011).
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Thermo-responsive polymers(pNIPAM)
LCST ?
Hydrodynamic transformation of a free-standing
nanosheet Induced by a thermo-responsive surface
Br BrBr
Bromo initiation ATRP of NIPAM
NH
CO
PMPDEA, CuBr
MeOH/water
Br
C
Br
O
TEA
THF
OH NH2 OH
SiO2
Peel-off with tweezers Release in water
PVA cast
Chitosan
Alginate
pNIPAM
41 nm
10.5 pair
47 nm
Prof. Advincula
(U. Houston, TX)
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40 oC-225 oC-2
25 oC-1 40 oC-1
1 cm
ACS Appl. Mater. Inter., 1, 1404-1413 (2009).
Blue
Softening
Locating in the water
Orange
Stiffening
Locating on the air-water
interface
Reversible conversion of the color, property, and
location of the nanosheet by temperature change
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Convenient method for surface modification by
patching a free-standing anti-biofouling nanosheet
J. Mater. Chem. (2011) in press
PAH
PC
MPC
MPCMPC
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Fluorescent microscopic images of NIH-3T3 cells at the
interface between the FITC-labeled pMPC-nanosheets and
the intact cell culture dish after 72-hrs culture
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Few immobilized thrombins are sufficient for platelet spreading(with LIMES, U. Bonn)
(37oC, 15 min)
Blood(without anti-coagulant)
A few immobilizing Thr molecules on the
nanosheet readily activate platelets.
This number is more than 1000-fold
lower than expected from experiments
in solution !!
Biophys. J. 100,1855- 1863 (2011).
29
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Nanosheet(LbL)
16 x 15 cm
Dipping
Spray-coater Inside
Spray-Coating
4 x 4 cm
Manufacturing of polysaccharide nanosheets
in an industrial scale
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Manufacturing of PLLA nanosheets
in an industrial scale
10 cm x 200 m x 60 nm as a free-standing state
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Reconstruction of nanosheets from fragments
5 mm
10 mm
Casting from a fragmented nanosheets
suspension
Dipping in a fragmented nanosheets
suspension and drawing
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Various researches and applications
• Nanoparticles(Ag, Au, Fe2O3)-loaded nanosheet as a new functional
materials.
• Drug-loaded nanosheets for periodontal, dermatological,
ophthalmological, and otorhinolaryngological applications.
• Polymorphic structures such as tube-like, bag-like, chip-like, ribbon-
like, porous structures by various methods such as spray-coating,
printing, phase-separation and removing, molding methods.
• Other applications such as cosmetics, foods, optoelectronics,
catalysts, environmental materials.
• Basic polymer physics such as crystallinity, thermal properties,
permeability, surface properties between substrate-side and air-side.
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(Waseda Univ.) Prof. Osaka, Prof. Homma, Prof. Ikeda, Prof. Goda, Prof.
Asahi, Dr. Y. Okamura, Dr. T. Fujie, Mr. Akihiro Saito, MC, BC colleageus
(National Defense Medical College) Assoc. Prof. M.Kinoshita, Dr. H. Miyazaki,
Mr. S. Ohtsubo, Prof. D. Saitoh
(IIT@SSSA, Italy) Prof. P. Dario, Prof. A Menciassi, Dr. V. Mattori, Dr. V.
Pensabene
(U. Bonn, LIMES, Germany) Prof. T. Lang, Prof. Hoch, Dr. D. Walrafen, Dr. L.
Fernando
(U. Huston, USA) Prof. R. C. Advincula
“High-Tech Research Center” Project for Waseda University: matching fund
subsidy; grant-in-aid for Scientific Research (B) 21300181 from MEXT
Global Center of Excellence (Global COE), Waseda University, "Practical Chemical Wisdom“, from MEXT
Hi-Tech Research Center, Waseda University, “Medicine/Science/Engineering Interdisciplinary Life Science Research Center”, from MEXT
Adaptable and Seamless Technology Transfer Program through Target-driven
R&D (A-STEP) from JST, Japan
A grant-in-aid for the Special Research Program from the National Defense
Medical College
Acknowledgments
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Biopolis, Singapore
Clean room for nanoparticle preparation
Room for Microscopies
Room for animal study
Open labo
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Evaluation of nanosheets as wound healing materials
Overlapping treatment of nanosheets of the perforated cecum
0 1 2 3 4 5 6 7 8
Time after operation (days)
Mouse v
iabili
ty
(%)
20
40
60
80
100
0
****
CF
U (
x 1
04)
Nanosheet PVA
200
400
600
800
1000
1200
1400
1600
0
*
Suture
*Nanosheet
PVA
Suture
(Surgery 2010;148:48-58)
Plastering treatment of nanosheets for the mouse burn skin
Second degree burn70C, 4 sec
Nanosheetplastering
Dissemination ofPseudomonas Aeruginosa
Evaluation of the treatment
Ps (+) / nanosheet (-)Ps (+) / nanosheet (+)
Hemostatic treatment of incision wound of the inferior vena cava
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membrane (f: 8 mm) attached with a nanosheet
E. coli (1 x 106)
FBSOuter
Inner
E.coli
E.coli
100 mm
6 hrs
24 hrs
0
100
200
300
400
500
600
700
PVAc-TC-nanosheetPVAc-nanosheet
without nanosheet
**
6 hrs24 hrs
Antimicrobial permeability test
using a transmembrane assay
PVAc-TC-nanosheet PVAc-nanosheet
E. Coli were penetrating through the
nanosheet without TC and such invasion
was shut off by the TC layer.
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TC release from the PVAc-TC-nanosheet with
different PVAc thickness under physiological
condition (37oC, pH7.4)
0
20
40
60
80
100
0 10 20 30 40 50 60
Time (min)
TC
rele
ase (
%)
0
20
40
60
80
100
0 1 2 3 4 5 6Time (hrs)
TC
rele
ase (
%)
0 nm
50 nm
100 nm
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Fabrication procedure for a polysaccharide nanosheet
supported by a PVA film and its application
for a cecal defect caused by needle puncture.
Surgery, 148, 48-58 (2010).
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Application of the polysaccharide nanosheet
to a murine cecal puncture model
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Time-course study of murine survival after sealing the puncture
holes with nanosheet samples compared with suturing.
suture(square).nanosheet(circle)
PVA film (triangle)
The number of intraperitoneal bacterium one day after the treatment using a nanosheetfor the 0.8 mm2 hole.
0.5 mm2 puncture hole 0.8 mm2 puncture hole
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mucosa
serosa
muscle
mucosa
serosamuscle
puncturepuncture
PVAc-nanosheetPVAc-TC-nanosheet
Histological sections of cecal punctured lesion after
treatment with nanosheet samples (2 weeks)
Instead of the typical accumulation/growth of fibroblasts around the site
of injury, lipocytes or fibroblasts specifically bridged the tissue-defect site
without any associated inflammatory reactions and tissue adhesion,
resulting in almost complete regeneration of the mucosal defect.
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Introduction of Bio-molecular Assembly Science Labo.
OO
O
NH
CO (CH2)n CH3
O (CH2)n CH3
H3N
NH
NHNH3
+
+
Gene Transfection by Cationic Liposomes
Nanosheets: Ultra-thin Dressing Material
OO
O
NH
CO (CH2)n CH3
O (CH2)n CH3
H3N
H3N+
+BIO-MOLECULAR
ASSEMBLY Takeoka Lab.
NH
HN
N
O
HN
N
HN
O HN
NH
O
N
HN
N
NH
HN
ONH
O
O
N
NH
NNH
-OOC N
-OOC-OOC
COO-N
COO-COO-
Fluorescent
molecules
Ni2+ Ni2+
Scaffold
His-Tag Targeting Probes
20 mm 5 mm
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Nanosheet(LbL)Nanosheet(coating) Nanosheet(hybrid)
Nanosheet (LbL)
Hydrophobic Drug
Hydrophobic (drug) +
Hydrophilic (sheet)
Nanosheet(Coat)
Hydrophobic Drug
Hydrophobic (drug) +
Hydrophobic (sheet)
LbLナノシート
Hydrophilic Drug
Protective layer
Hydrophobic (barrier) +
Hydrophilic (drug) +
Hydrophilic (sheet) +
Drug-loading nanosheets
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Methods to prepare free-standing nanosheets
Sacrificial-layer method
Supporting-layer method
Substrate
PVA
Nanosheet
Nanosheet
SubstrateSacrificial layer
Peeling off and immersed into water
Immersed into water